Veröffentlichungen

2021 [ nach oben ]

1.
Antoniadis, A., Capretto, M., Chalermsook, P., Damerius, C., Kling, P., Nölke, L., Obscura, N., Spoerhase, J.: On Minimum Generalized Manhattan Connections. Proc. 17th Algorithms and Data Structures Symposium (WADS’21) (2021).
[ BibTeX ] [ URL ]
 
@inproceedings{antoniadis2021minimum, author = {Antoniadis, Antonios and Capretto, Margarita and Chalermsook, Parinya and Damerius, Christoph and Kling, Peter and Nölke, Lukas and Obscura, Nidia and Spoerhase, Joachim}, booktitle = {Proc. 17th Algorithms and Data Structures Symposium (WADS'21)}, keywords = {Manhattan approximability data geometric myown network structure}, note = {to appear}, title = {On Minimum Generalized Manhattan Connections}, year = 2021 }
2.
Appel, M., Lugrin, B., Kühle, M., Heindl, C.: The emotional robotic storyteller: On the influence of affect congruency on narrative transportation, robot perception, and persuasion. Computers in Human Behavior. 106749 (2021).
[ BibTeX ] [ URL ] [ DOI ]
 
@article{Appel_2021, author = {Appel, Markus and Lugrin, Birgit and Kühle, Mayla and Heindl, Corinna}, journal = {Computers in Human Behavior}, keywords = {birgit mi myown storyteller}, pages = 106749, publisher = {Elsevier}, title = {The emotional robotic storyteller: On the influence of affect congruency on narrative transportation, robot perception, and persuasion}, year = 2021 }
3.
Supervisor: Metzger, F.: Comparative Smart City Simulation of LoRaWAN and NB-IoT, (2021).
[ Abstract ] [ BibTeX ]
 
Urban environments are the intended use case of LPWAN technologies. But which technology is best suited for a Smart City and large numbers of IoT devices? Your task is to set up a combined simulation environment that implements both LoRaWAN as well as NB-IoT and their respective high-level architectures. This serves as a framework to thoroughly scrutinize these technologies.
@mastersthesis{info3-praktikum-2021-5, abstract = {Urban environments are the intended use case of LPWAN technologies. But which technology is best suited for a Smart City and large numbers of IoT devices? Your task is to set up a combined simulation environment that implements both LoRaWAN as well as NB-IoT and their respective high-level architectures. This serves as a framework to thoroughly scrutinize these technologies.}, author = {Supervisor: Metzger, Florian}, keywords = {myown}, school = {University of Würzburg}, title = {Comparative Smart City Simulation of LoRaWAN and NB-IoT}, year = 2021 }
4.
Supervisor: Grigorjew, A.: Comparison of Different TSN Shaping Strategies for Various Reservation Models, (2021).
[ Abstract ] [ BibTeX ]
 
Kontakt: alexej.grigorjew@uni-wuerzburg.de -- Angestoßen durch neue Anwendungen in den Gebieten Industrie 4.0, autonomes Fahren und in Carrier-Netzwerken steigt der Umfang an Machine-to-Machine (M2M) Kommunikation stetig an. Traditionell wurde diese Kommunikation durch Bus-Systeme wie CAN und PROFIBUS realisiert, um bei niedriger Komplexität gut vorhersagbare Leistung zu erhalten. Neuere Systeme haben jedoch höhere Anforderungen an Bandbreite, Latenz und Zuverlässigkeit, weshalb langsam ein Übergang in Richtung Ethernet-Technologien stattfindet. Daraus entstanden sehr viele verschiedene Technologien, die im Grunde die gleichen Ziele verfolgen, aber untereinander nicht kompatibel sind. Die IEEE Standardisierungsgruppe Time-Sensitive Networking (TSN) versucht nun, durch diverse Erweiterungen der Ethernet-Standards eine einheitliche Definition der Mechanismen zu bilden. Diese Erweiterungen umfassen neue Scheduling-Methoden auf der Data Plane, sowie unterschiedliche Ressourcen-Reservierungsmodelle auf der Control Plane. Zu den interessanten Shapern zählen Priority Transmission, Credit-Based Shaping, Asynchronous Traffic Shaping, Timed Gates und Cyclic Queuing and Forwarding. Die Control Plane ist für die Reservierung von Ressourcen zuständig. Dieser Prozess findet entweder zentral statt (globaler Controller im Netzwerk) oder verteilt (separate Control Plane an jedem Switch). Vorrangiges Ziel ist das Garantieren von maximalen Ende-zu-Ende Latenzen. Neue Verkehrsströme kommunizieren ihre Anforderungen an das Netzwerk, welches die Anfragen entweder annehmen oder ablehnen muss. Dazu werden auf Basis mathematischer Modelle neue Latenzschranken für die aktuelle Situation berechnet. Je nach verwendetem Shaper und Reservierungsprozess kommt dazu ein anderes Berechnungsmodell zum Einsatz. Diese haben jeweils Vor- und Nachteile in unterschiedlichen Szenarien. Ziel dieser Arbeit ist es, jedes Modell in einem kleinen Framework zu implementieren, unterschiedliche Szenarien für die Evaluation zu definieren, und damit einen empirischen Vergleich der jeweiligen Shaper und Prozesse durchzuführen (Parameterstudie). Kernkriterium ist dabei die Effizienz des Netzwerks unter den gegebenen Ressourcen, z.B. gemessen an der Anzahl (oder Bandbreite) von akzeptierten Echtzeit-Verkehrsströmen. Weitere sekundäre Kriterien sind denkbar und repräsentieren einen Trade-Off (Rechenkomplexität, Kosten, ...). Dieser Trade-Off soll in der Evaluation deutlich werdend.
@mastersthesis{info3-master-2021-5, abstract = {Kontakt: alexej.grigorjew@uni-wuerzburg.de – Angestoßen durch neue Anwendungen in den Gebieten Industrie 4.0, autonomes Fahren und in Carrier-Netzwerken steigt der Umfang an Machine-to-Machine (M2M) Kommunikation stetig an. Traditionell wurde diese Kommunikation durch Bus-Systeme wie CAN und PROFIBUS realisiert, um bei niedriger Komplexität gut vorhersagbare Leistung zu erhalten. Neuere Systeme haben jedoch höhere Anforderungen an Bandbreite, Latenz und Zuverlässigkeit, weshalb langsam ein Übergang in Richtung Ethernet-Technologien stattfindet. Daraus entstanden sehr viele verschiedene Technologien, die im Grunde die gleichen Ziele verfolgen, aber untereinander nicht kompatibel sind. Die IEEE Standardisierungsgruppe Time-Sensitive Networking (TSN) versucht nun, durch diverse Erweiterungen der Ethernet-Standards eine einheitliche Definition der Mechanismen zu bilden. Diese Erweiterungen umfassen neue Scheduling-Methoden auf der Data Plane, sowie unterschiedliche Ressourcen-Reservierungsmodelle auf der Control Plane. Zu den interessanten Shapern zählen Priority Transmission, Credit-Based Shaping, Asynchronous Traffic Shaping, Timed Gates und Cyclic Queuing and Forwarding. Die Control Plane ist für die Reservierung von Ressourcen zuständig. Dieser Prozess findet entweder zentral statt (globaler Controller im Netzwerk) oder verteilt (separate Control Plane an jedem Switch). Vorrangiges Ziel ist das Garantieren von maximalen Ende-zu-Ende Latenzen. Neue Verkehrsströme kommunizieren ihre Anforderungen an das Netzwerk, welches die Anfragen entweder annehmen oder ablehnen muss. Dazu werden auf Basis mathematischer Modelle neue Latenzschranken für die aktuelle Situation berechnet. Je nach verwendetem Shaper und Reservierungsprozess kommt dazu ein anderes Berechnungsmodell zum Einsatz. Diese haben jeweils Vor- und Nachteile in unterschiedlichen Szenarien. Ziel dieser Arbeit ist es, jedes Modell in einem kleinen Framework zu implementieren, unterschiedliche Szenarien für die Evaluation zu definieren, und damit einen empirischen Vergleich der jeweiligen Shaper und Prozesse durchzuführen (Parameterstudie). Kernkriterium ist dabei die Effizienz des Netzwerks unter den gegebenen Ressourcen, z.B. gemessen an der Anzahl (oder Bandbreite) von akzeptierten Echtzeit-Verkehrsströmen. Weitere sekundäre Kriterien sind denkbar und repräsentieren einen Trade-Off (Rechenkomplexität, Kosten, ...). Dieser Trade-Off soll in der Evaluation deutlich werdend.}, author = {Supervisor: Grigorjew, Alexej}, keywords = {myown ats-performance}, school = {University of Wuerzburg}, title = {Comparison of Different TSN Shaping Strategies for Various Reservation Models}, year = 2021 }
5.
Loh, F., Geißler, S., Schaible, F., Hoßfeld, T.: Talk to Me: Investigating the Traffic Characteristics of Amazon Echo Dot and Google Home. International Conference on Communications and Electronics, ICCE (2021).
[ Abstract ] [ BibTeX ]
 
The application area of smart speakers is steadily increasing with the Amazon Echo family and Google Home being brand leaders. Use cases include, among others, updating the calendar, home automation, or simply assisting users in their every day life. With the increasing amount of devices, the traffic generation and requesting process becomes a relevant subject to be studied in order to create traffic models and predict the impact on networks by these types of devices. Furthermore, with a detailed understanding of the devices, service quality can be monitored and improved for the end user. For that reason, in this work the requesting and traffic generation process of the Amazon Echo Dot and Google Home are studied and the generated network load of both devices is compared. With the insights of this study and additional device usage statistics, detailed traffic and usage models can be created.
@inproceedings{info3-inproceedings-2021-5, abstract = {The application area of smart speakers is steadily increasing with the Amazon Echo family and Google Home being brand leaders. Use cases include, among others, updating the calendar, home automation, or simply assisting users in their every day life. With the increasing amount of devices, the traffic generation and requesting process becomes a relevant subject to be studied in order to create traffic models and predict the impact on networks by these types of devices. Furthermore, with a detailed understanding of the devices, service quality can be monitored and improved for the end user. For that reason, in this work the requesting and traffic generation process of the Amazon Echo Dot and Google Home are studied and the generated network load of both devices is compared. With the insights of this study and additional device usage statistics, detailed traffic and usage models can be created.}, author = {Loh, Frank and Geißler, Stefan and Schaible, Fabian and Hoßfeld, Tobias}, booktitle = {International Conference on Communications and Electronics, ICCE}, keywords = {myown}, month = 1, title = {Talk to Me: Investigating the Traffic Characteristics of Amazon Echo Dot and Google Home}, year = 2021 }
6.
Madeira, O., Gromer, D., Latoschik, M.E., Pauli, P.: Effects of Acrophobic Fear and Trait Anxiety on Human Behavior in a Virtual Elevated Plus-Maze. Frontiers in Virtual Reality. (2021).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
The Elevated Plus-Maze (EPM) is a well-established apparatus to measure anxiety in rodents, i.e. animals exhibiting an increased relative time spent in the closed versus the open arms are considered anxious. To examine whether such anxiety-modulated behavior is conserved in humans, we re-translated this paradigm to a human setting using virtual reality in a Cave Automatic Virtual Environment (CAVE) system. In two studies, we examined whether the EPM exploration behavior of humans is modulated by their trait anxiety, but also assessed the individuals’ levels of acrophobia (fear of height), claustrophobia (fear of confined spaces), sensation seeking and the reported anxiety when on the maze. First, we constructed an exact virtual copy of the animal EPM adjusted to human proportions. In analogy to animal EPM studies, participants (N = 30) freely explored the EPM for five minutes. In the second study (N = 61), we redesigned the EPM to make it more human-adapted and to differentiate influences of trait anxiety and acrophobia by introducing various floor textures and lower walls of closed arms to the height of common handrails. In the first experiment, hierarchical regression analyses of exploration behavior revealed the expected association between open arm avoidance and Trait Anxiety, but an even stronger association with acrophobic fear. In the second study, results revealed that acrophobia was associated with avoidance of open arms with mesh-floor texture, whereas for trait anxiety, claustrophobia and sensation seeking no effect was detected. In addition, subjects’ fear rating was moderated by all psychometrics but trait anxiety. In sum, both studies consistently indicate that humans show no general open arm avoidance analogous to rodents and that human EPM behavior is modulated strongest by acrophobic fear, whereas trait anxiety plays a subordinate role. Thus, we conclude that the criteria for a cross-species validity are met insufficiently in this case. Despite of the exploratory nature, our studies provide in-depth insights into human exploration behavior on the virtual EPM.
@article{madeira2021effects, abstract = {The Elevated Plus-Maze (EPM) is a well-established apparatus to measure anxiety in rodents, i.e. animals exhibiting an increased relative time spent in the closed versus the open arms are considered anxious. To examine whether such anxiety-modulated behavior is conserved in humans, we re-translated this paradigm to a human setting using virtual reality in a Cave Automatic Virtual Environment (CAVE) system. In two studies, we examined whether the EPM exploration behavior of humans is modulated by their trait anxiety, but also assessed the individuals’ levels of acrophobia (fear of height), claustrophobia (fear of confined spaces), sensation seeking and the reported anxiety when on the maze. First, we constructed an exact virtual copy of the animal EPM adjusted to human proportions. In analogy to animal EPM studies, participants (N = 30) freely explored the EPM for five minutes. In the second study (N = 61), we redesigned the EPM to make it more human-adapted and to differentiate influences of trait anxiety and acrophobia by introducing various floor textures and lower walls of closed arms to the height of common handrails. In the first experiment, hierarchical regression analyses of exploration behavior revealed the expected association between open arm avoidance and Trait Anxiety, but an even stronger association with acrophobic fear. In the second study, results revealed that acrophobia was associated with avoidance of open arms with mesh-floor texture, whereas for trait anxiety, claustrophobia and sensation seeking no effect was detected. In addition, subjects’ fear rating was moderated by all psychometrics but trait anxiety. In sum, both studies consistently indicate that humans show no general open arm avoidance analogous to rodents and that human EPM behavior is modulated strongest by acrophobic fear, whereas trait anxiety plays a subordinate role. Thus, we conclude that the criteria for a cross-species validity are met insufficiently in this case. Despite of the exploratory nature, our studies provide in-depth insights into human exploration behavior on the virtual EPM.}, author = {Madeira, Octávia and Gromer, Daniel and Latoschik, Marc Erich and Pauli, Paul}, journal = {Frontiers in Virtual Reality}, keywords = {myown}, note = {provisionally accepted}, title = {Effects of Acrophobic Fear and Trait Anxiety on Human Behavior in a Virtual Elevated Plus-Maze}, year = 2021 }
7.
Funk, M.S.: Comparing Video QoE Models Using Subjective QoE Data Sets, (2021).
[ Abstract ] [ BibTeX ]
 
Contact: anika.seufert@informatik.uni-wuerzburg.de -- Inhalt: Der weltweite Videoverkehr hat in den letzten Jahren dramatisch zugenommen. Mit diesem rasanten Wachstum steigt auch das Interesse am Anwendungsverhalten von Video-Streaming-Diensten und dem daraus resultierenden Benutzererlebnis. Um mit Hilfe von objektiven Parametern (wie z. B. der Anzahl an Stalling Events oder Qualitätswechseln) die Zufriedenheit der Endnutzer (QoE) abzuschätzen, gibt es in der Literatur zahlreiche Modelle. Ziel dieser Arbeit ist es daher, einen Überblick über die Gemeinsamkeiten aber auch Unterschiede dieser QoE-Modelle zu bekommen. Dazu sollen mehrere Modelle implementiert werden und anhand verschiedenener subjektiver Video-Streaming-Datensätze verglichen werden. -- Abstract: Global video traffic has increased dramatically in recent years. With this rapid growth, there is also increasing interest in the application behavior of video streaming services and the resulting user experience (QoE). In order to estimate end-user satisfaction using objective parameters (such as the number of stalling events or quality changes), there are numerous models in the literature which can be used. Therefore, the goal of this thesis is to get an overview of the similarities but also differences of these QoE models. For this purpose, several models will be implemented and compared using different subjective video streaming datasets.
@mastersthesis{info3-bachelor-2021-11, abstract = {Contact: anika.seufert@informatik.uni-wuerzburg.de – Inhalt: Der weltweite Videoverkehr hat in den letzten Jahren dramatisch zugenommen. Mit diesem rasanten Wachstum steigt auch das Interesse am Anwendungsverhalten von Video-Streaming-Diensten und dem daraus resultierenden Benutzererlebnis. Um mit Hilfe von objektiven Parametern (wie z. B. der Anzahl an Stalling Events oder Qualitätswechseln) die Zufriedenheit der Endnutzer (QoE) abzuschätzen, gibt es in der Literatur zahlreiche Modelle. Ziel dieser Arbeit ist es daher, einen Überblick über die Gemeinsamkeiten aber auch Unterschiede dieser QoE-Modelle zu bekommen. Dazu sollen mehrere Modelle implementiert werden und anhand verschiedenener subjektiver Video-Streaming-Datensätze verglichen werden. – Abstract: Global video traffic has increased dramatically in recent years. With this rapid growth, there is also increasing interest in the application behavior of video streaming services and the resulting user experience (QoE). In order to estimate end-user satisfaction using objective parameters (such as the number of stalling events or quality changes), there are numerous models in the literature which can be used. Therefore, the goal of this thesis is to get an overview of the similarities but also differences of these QoE models. For this purpose, several models will be implemented and compared using different subjective video streaming datasets.}, author = {Funk, Marie Sophie}, keywords = {myown}, school = {University of Würzburg}, title = {Comparing Video QoE Models Using Subjective QoE Data Sets}, year = 2021 }
8.
Obremski, D., Lugrin, J.-L., Schaper, P., Lugrin, B.: Non-native speaker perception of Intelligent Virtual Agents in two languages: the impact of amount and type of grammatical mistakes. Journal on Multimodal User Interfaces. (2021).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
Having a mixed-cultural membership becomes increasingly common in our modern society. It is thus beneficial in several ways to create Intelligent Virtual Agents (IVAs) that reflect a mixed-cultural background as well, e.g., for educational settings. For research with such IVAs, it is essential that they are classified as non-native by members of a target culture. In this paper, we focus on variations of IVAs' speech to create the impression of non-native speakers that are identified as such by speakers of two different mother tongues. In particular, we investigate grammatical mistakes and identify thresholds beyond which the agents is clearly categorised as a non-native speaker. Therefore, we conducted two experiments: one for native speakers of German, and one for native speakers of English. Results of the German study indicate that beyond 10% of word order mistakes and 25% of infinitive mistakes German-speaking IVAs are perceived as non-native speakers. Results of the English study indicate that beyond 50% of omission mistakes and 50% of infinitive mistakes English-speaking IVAs are perceived as non-native speakers. We believe these thresholds constitute helpful guidelines for computational approaches of non-native speaker generation, simplifying research with IVAs in mixed-cultural settings.
@article{Obremski2021, abstract = {Having a mixed-cultural membership becomes increasingly common in our modern society. It is thus beneficial in several ways to create Intelligent Virtual Agents (IVAs) that reflect a mixed-cultural background as well, e.g., for educational settings. For research with such IVAs, it is essential that they are classified as non-native by members of a target culture. In this paper, we focus on variations of IVAs' speech to create the impression of non-native speakers that are identified as such by speakers of two different mother tongues. In particular, we investigate grammatical mistakes and identify thresholds beyond which the agents is clearly categorised as a non-native speaker. Therefore, we conducted two experiments: one for native speakers of German, and one for native speakers of English. Results of the German study indicate that beyond 10{\%} of word order mistakes and 25{\%} of infinitive mistakes German-speaking IVAs are perceived as non-native speakers. Results of the English study indicate that beyond 50{\%} of omission mistakes and 50{\%} of infinitive mistakes English-speaking IVAs are perceived as non-native speakers. We believe these thresholds constitute helpful guidelines for computational approaches of non-native speaker generation, simplifying research with IVAs in mixed-cultural settings.}, author = {Obremski, David and Lugrin, Jean-Luc and Schaper, Philipp and Lugrin, Birgit}, journal = {Journal on Multimodal User Interfaces}, keywords = {IVA birgit lugrin mi myown obremski schaper}, title = {Non-native speaker perception of Intelligent Virtual Agents in two languages: the impact of amount and type of grammatical mistakes}, year = 2021 }
9.
Mara, M., Stein, J.-P., Latoschik, M.E., Lugrin, B., Schreiner, C., Hostettler, R., Appel, M.: User Responses to a Humanoid Robot Observed in Real Life, Virtual Reality, 3D and 2D. Frontiers in Psychology - Human-Media Interaction. 12, 1152 (2021).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
Humanoid robots (i.e., robots with a human-like body) are projected to be mass marketed in the future in several fields of application. Today, however, user evaluations of humanoid robots are often based on mediated depictions rather than actual observations or interactions with a robot, which holds true not least for scientific user studies. People can be confronted with robots in various modes of presentation, among them (1) 2D videos, (2) 3D, i.e., stereoscopic videos, (3) immersive Virtual Reality (VR), or (4) live on site. A systematic investigation into how such differential modes of presentation influence user perceptions of a robot is still lacking. Thus, the current study systematically compares the effects of different presentation modes with varying immersive potential on user evaluations of a humanoid service robot. Participants (N = 120) observed an interaction between a humanoid service robot and an actor either on 2D or 3D video, via a virtual reality headset (VR) or live. We found support for the expected effect of the presentation mode on perceived immediacy. Effects regarding the degree of human likeness that was attributed to the robot were mixed. The presentation mode had no influence on evaluations in terms of eeriness, likability, and purchase intentions. Implications for empirical research on humanoid robots and practice are discussed.
@article{mara2021responses, abstract = {Humanoid robots (i.e., robots with a human-like body) are projected to be mass marketed in the future in several fields of application. Today, however, user evaluations of humanoid robots are often based on mediated depictions rather than actual observations or interactions with a robot, which holds true not least for scientific user studies. People can be confronted with robots in various modes of presentation, among them (1) 2D videos, (2) 3D, i.e., stereoscopic videos, (3) immersive Virtual Reality (VR), or (4) live on site. A systematic investigation into how such differential modes of presentation influence user perceptions of a robot is still lacking. Thus, the current study systematically compares the effects of different presentation modes with varying immersive potential on user evaluations of a humanoid service robot. Participants (N = 120) observed an interaction between a humanoid service robot and an actor either on 2D or 3D video, via a virtual reality headset (VR) or live. We found support for the expected effect of the presentation mode on perceived immediacy. Effects regarding the degree of human likeness that was attributed to the robot were mixed. The presentation mode had no influence on evaluations in terms of eeriness, likability, and purchase intentions. Implications for empirical research on humanoid robots and practice are discussed.}, author = {Mara, Martina and Stein, Jan-Philipp and Latoschik, Marc Erich and Lugrin, Birgit and Schreiner, Constanze and Hostettler, Rafael and Appel, Markus}, editor = {and}, journal = {Frontiers in Psychology - Human-Media Interaction}, keywords = {myown}, pages = 1152, title = {User Responses to a Humanoid Robot Observed in Real Life, Virtual Reality, 3D and 2D}, volume = 12, year = 2021 }
10.
Supervisor: Seufert, M.: Transfer Learning for QoE Monitoring of Encrypted Video Streaming Traffic, (2021).
[ Abstract ] [ BibTeX ]
 
Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Transfer Learning for QoE Monitoring of Encrypted Video Streaming Traffic Abstract: This work is focused on Quality of Experience (QoE) monitoring of encrypted video streaming traffic. Here, machine learning based methods are used to estimate QoE metrics based on features or embeddings, which are extracted from the encrypted traffic. While these machine learning models achieve very good performance for a specific training data set, they typically show a worse performance when applied to different data sets. Thus, in this thesis, transfer learning approaches shall be tested and/or developed, which allow the existing models to generalize also over heterogeneous data sets. The performance of the transfer learning approaches shall be evaluated and a methodology for generalizing machine learning based QoE monitoring models shall be developed. Titel: Transferlernen bei der QoE Messung auf verschlüsseltem Videostreamingverkehr Inhalt: Diese Arbeit beschäftigt sich mit der QoE Messung auf verschlüsseltem Videostreamingverkehr. Hierbei werden Methoden des maschinellen Lernens (ML) eingesetzt um QoE-Metriken zu schätzen basierend auf Features oder Embeddings, die aus dem verschlüsselten Verkehr extrahiert werden. Während diese ML-Modelle sehr gute Leistung für spezifische Datensätze zeigen, haben sie typischerweise eine schlechtere Leistung wenn sie auf andere Datensätze angewandt werden. Deshalb sollen in dieser Arbeit Transferlernverfahren getestet und/oder entwickelt werden, die es erlauben, dass die existierenden Modelle auch für heterogene Datensätze verallgemeinert werden können. Die Leistung der Transferlernansätze soll bewertet werden und eine Methodik für die Generalisierung von ML-Modellen für QoE Messungen soll entwickelt werden.
@mastersthesis{info3-master-2019-6, abstract = {Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Transfer Learning for QoE Monitoring of Encrypted Video Streaming Traffic Abstract: This work is focused on Quality of Experience (QoE) monitoring of encrypted video streaming traffic. Here, machine learning based methods are used to estimate QoE metrics based on features or embeddings, which are extracted from the encrypted traffic. While these machine learning models achieve very good performance for a specific training data set, they typically show a worse performance when applied to different data sets. Thus, in this thesis, transfer learning approaches shall be tested and/or developed, which allow the existing models to generalize also over heterogeneous data sets. The performance of the transfer learning approaches shall be evaluated and a methodology for generalizing machine learning based QoE monitoring models shall be developed. Titel: Transferlernen bei der QoE Messung auf verschlüsseltem Videostreamingverkehr Inhalt: Diese Arbeit beschäftigt sich mit der QoE Messung auf verschlüsseltem Videostreamingverkehr. Hierbei werden Methoden des maschinellen Lernens (ML) eingesetzt um QoE-Metriken zu schätzen basierend auf Features oder Embeddings, die aus dem verschlüsselten Verkehr extrahiert werden. Während diese ML-Modelle sehr gute Leistung für spezifische Datensätze zeigen, haben sie typischerweise eine schlechtere Leistung wenn sie auf andere Datensätze angewandt werden. Deshalb sollen in dieser Arbeit Transferlernverfahren getestet und/oder entwickelt werden, die es erlauben, dass die existierenden Modelle auch für heterogene Datensätze verallgemeinert werden können. Die Leistung der Transferlernansätze soll bewertet werden und eine Methodik für die Generalisierung von ML-Modellen für QoE Messungen soll entwickelt werden.}, author = {Supervisor: Seufert, Michael}, keywords = {myown}, school = {University of Würzburg}, title = {Transfer Learning for QoE Monitoring of Encrypted Video Streaming Traffic}, year = 2021 }
11.
Winter, C., Kern, F., Gall, D., Latoschik, M.E., Pauli, P., Käthner, I.: Immersive virtual reality during gait rehabilitation increases walking speed and motivation: A usability evaluation with healthy participants and patients with multiple sclerosis and stroke. Journal of NeuroEngineering and Rehabilitation. (2021).
[ Abstract ] [ BibTeX ]
 
Background. The rehabilitation of gait disorders in multiple sclerosis (MS) and stroke patients is often based on conventional treadmill training. Virtual reality (VR)-based treadmill training can increase motivation and improve therapy outcomes. Objective. The present study aimed at (1) demonstrating the feasibility and acceptance of an immersive virtual reality application (presented via head-mounted display, HMD) for gait rehabilitation with patients, and (2) compare its effects to a semi-immersive presentation (via a monitor) and a conventional treadmill training without VR. Methods and results. 36 healthy participants and 14 persons with MS or stroke participated in each of the three experimental conditions. For both groups, the walking speed in the HMD condition was higher than in treadmill training without VR. Healthy participants reported a higher motivation after the HMD condition as compared with the other conditions. Importantly, no side effects in the sense of simulator sickness occurred and usability ratings were high. Most of the healthy study participants (89 %) and patients (71 %) preferred the HMD-based training among the three conditions and most patients could imagine using it more frequently. Conclusion. The study demonstrated the feasibility of combining a treadmill training with immersive VR. Due to its high usability and low side effects, the immersive system could serve as a valid alternative to conventional treadmill training in gait rehabilitation. It might be particularly suited for patients to improve training motivation and training outcome e. g. the walking speed compared with treadmill training using no or only semi-immersive VR.
@article{winter2021immersive, abstract = {Background. The rehabilitation of gait disorders in multiple sclerosis (MS) and stroke patients is often based on conventional treadmill training. Virtual reality (VR)-based treadmill training can increase motivation and improve therapy outcomes. Objective. The present study aimed at (1) demonstrating the feasibility and acceptance of an immersive virtual reality application (presented via head-mounted display, HMD) for gait rehabilitation with patients, and (2) compare its effects to a semi-immersive presentation (via a monitor) and a conventional treadmill training without VR. Methods and results. 36 healthy participants and 14 persons with MS or stroke participated in each of the three experimental conditions. For both groups, the walking speed in the HMD condition was higher than in treadmill training without VR. Healthy participants reported a higher motivation after the HMD condition as compared with the other conditions. Importantly, no side effects in the sense of simulator sickness occurred and usability ratings were high. Most of the healthy study participants (89 %) and patients (71 %) preferred the HMD-based training among the three conditions and most patients could imagine using it more frequently. Conclusion. The study demonstrated the feasibility of combining a treadmill training with immersive VR. Due to its high usability and low side effects, the immersive system could serve as a valid alternative to conventional treadmill training in gait rehabilitation. It might be particularly suited for patients to improve training motivation and training outcome e. g. the walking speed compared with treadmill training using no or only semi-immersive VR.}, author = {Winter, Carla and Kern, Florian and Gall, Dominik and Latoschik, Marc Erich and Pauli, Paul and Käthner, Ivo}, journal = {Journal of NeuroEngineering and Rehabilitation}, keywords = {myown}, note = {accepted, to be published}, title = {Immersive virtual reality during gait rehabilitation increases walking speed and motivation: A usability evaluation with healthy participants and patients with multiple sclerosis and stroke}, year = 2021 }
12.
Donnermann, M., Schaper, P., Lugrin, B.: Towards Adaptive Robotic Tutors in Universities: A Field Study. International Conference on Persuasive Technology (PERSUASIVE 2021). Springer (2021).
[ BibTeX ]
 
@inproceedings{donnermann2021towards, author = {Donnermann, Melissa and Schaper, Philipp and Lugrin, Birgit}, booktitle = {International Conference on Persuasive Technology (PERSUASIVE 2021)}, keywords = {birgit donnermann learning mi myown schaper}, publisher = {Springer}, title = {Towards Adaptive Robotic Tutors in Universities: A Field Study}, year = 2021 }
13.
Steinhaeusser, S.C., Gabel, J.J., Lugrin, B.: Your New Friend NAO vs. Robot No. 783 - Effects of Personal or Impersonal Framing in a Robotic Storytelling Use Case. In: Bethel, C., Paiva, A., Broadbent, E., Feil-Seifer, D., und Szafir, D. (hrsg.) Companion of the 2021 ACM/IEEE International Conference on Human-Robot Interaction (HRI 2021). ACM (2021).
[ BibTeX ] [ URL ] [ DOI ]
 
@inproceedings{Steinhaeusser_2021, author = {Steinhaeusser, Sophia C. and Gabel, Juliane J. and Lugrin, Birgit}, booktitle = {Companion of the 2021 ACM/IEEE International Conference on Human-Robot Interaction (HRI 2021)}, editor = {Bethel, Cindy and Paiva, Ana and Broadbent, Elizabeth and Feil-Seifer, David and Szafir, Daniel}, keywords = {birgit mi myown steinhaeusser storyteller}, publisher = {ACM}, title = {Your New Friend NAO vs. Robot No. 783 - Effects of Personal or Impersonal Framing in a Robotic Storytelling Use Case}, year = 2021 }
14.
Geiger, J., Cornelsen, S., Haunert, J.-H., Kindermann, P., Mchedlidze, T., Nöllenburg, M., Okamoto, Y., Wolff, A.: ClusterSets: Optimizing Planar Clusters in Categorical Point Data. Comput. Graphics Forum. 40, (2021).
[ BibTeX ]
 
@article{gchkmnow-coplc-EuroVis21, author = {Geiger, Jakob and Cornelsen, Sabine and Haunert, Jan-Henrik and Kindermann, Philipp and Mchedlidze, Tamara and N{ö}llenburg, Martin and Okamoto, Yoshio and Wolff, Alexander}, journal = {Comput. Graphics Forum}, keywords = {myown}, note = {To appear.}, number = 3, title = {ClusterSets: Optimizing Planar Clusters in Categorical Point Data}, volume = 40, year = 2021 }
15.
Steinhaeusser, S.C., Schaper, P., Lugrin, B.: Comparing a Robotic Storyteller versus Audio Book with Integration of Sound Effects and Background Music. In: Bethel, C., Paiva, A., Broadbent, E., Feil-Seifer, D., und Szafir, D. (hrsg.) Companion of the 2021 ACM/IEEE International Conference on Human-Robot Interaction (HRI 2021). ACM (2021).
[ BibTeX ] [ URL ] [ DOI ]
 
@inproceedings{Steinhaeusser_2021, author = {Steinhaeusser, Sophia C. and Schaper, Philipp and Lugrin, Birgit}, booktitle = {Companion of the 2021 ACM/IEEE International Conference on Human-Robot Interaction (HRI 2021)}, editor = {Bethel, Cindy and Paiva, Ana and Broadbent, Elizabeth and Feil-Seifer, David and Szafir, Daniel}, keywords = {birgit mi myown schaper steinhaeusser storyteller}, publisher = {ACM}, title = {Comparing a Robotic Storyteller versus Audio Book with Integration of Sound Effects and Background Music}, year = 2021 }
16.
Wieser, V.: Bandwidth Measurements in Mobile Scenarios using a Raspberry Pi, (2021).
[ BibTeX ]
 
@mastersthesis{info3-bachelor-2020-10, author = {Wieser, Viktoria}, keywords = {myown ucn}, month = 1, school = {University of Würzburg}, title = {Bandwidth Measurements in Mobile Scenarios using a Raspberry Pi}, year = 2021 }
17.
Stauffert, J.-P., Korwisi, K., Niebling, F., Latoschik, M.E.: Ka-Boom!!! Visually Exploring Latency Measurements for XR. Extended Abstracts of the 2021 CHI Conference on Human Factors in Computing Systems. Association for Computing Machinery, Yokohama, Japan (2021).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
Latency can be detrimental for the experience of Virtual Reality. High latency can lead to loss of performance and cybersickness. There are simple approaches to measure approximate latency and more elaborated for more insight into latency behavior. Yet there are still researchers who do not measure the latency of the system they are using to conduct VR experiments. This paper provides an illustrated overview of different approaches to measure latency of VR applications, as well as a small decision-making guide to assist in the choice of the measurement method. The visual style offers a more approachable way to understand how to measure latency.
@inproceedings{stauffert_kaboom_2021, abstract = {Latency can be detrimental for the experience of Virtual Reality. High latency can lead to loss of performance and cybersickness. There are simple approaches to measure approximate latency and more elaborated for more insight into latency behavior. Yet there are still researchers who do not measure the latency of the system they are using to conduct VR experiments. This paper provides an illustrated overview of different approaches to measure latency of VR applications, as well as a small decision-making guide to assist in the choice of the measurement method. The visual style offers a more approachable way to understand how to measure latency.}, address = {New York, NY, USA}, author = {Stauffert, Jan-Philipp and Korwisi, Kristof and Niebling, Florian and Latoschik, Marc Erich}, booktitle = {Extended Abstracts of the 2021 CHI Conference on Human Factors in Computing Systems}, keywords = {myown}, publisher = {Association for Computing Machinery}, series = {CHI EA '21}, title = {Ka-Boom!!! Visually Exploring Latency Measurements for XR}, year = 2021 }
18.
Wolf, E., Merdan, N., Döllinger, N., Mal, D., Wienrich, C., Botsch, M., Latoschik, M.E.: The Embodiment of Photorealistic Avatars Influences Female Body Weight Perception in Virtual Reality. Proceedings of the 28th IEEE Virtual Reality Conference (VR ’21) (2021).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
Embodiment and body perception have become important research topics in the field of virtual reality (VR). VR is considered a particularly promising tool to support research and therapy in regard to distorted body weight perception. However, the influence of embodiment on body weight perception has yet to be clarified. To address this gap, we compared body weight perception of 56 female participants of normal weight using a VR application. They either (a) self-embodied a photorealistic, non-personalized virtual human and performed body movements in front of a virtual mirror or (b) only observed the virtual human as other's avatar (or agent) performing the same movements in front of them. Afterward, participants had to estimate the virtual human's body weight. Additionally, we considered the influence of the participants' body mass index (BMI) on the estimations and captured the participants' feelings of presence and embodiment. Participants estimated the body weight of the virtual human as their embodied self-avatars significantly lower compared to participants rating the virtual human as other's avatar. Furthermore, the estimations of body weight were significantly predicted by the participant's BMI with embodiment, but not without. Our results clearly highlight embodiment as an important factor influencing the perception of virtual humans' body weights in VR.
@inproceedings{wolf2021embodiment, abstract = {Embodiment and body perception have become important research topics in the field of virtual reality (VR). VR is considered a particularly promising tool to support research and therapy in regard to distorted body weight perception. However, the influence of embodiment on body weight perception has yet to be clarified. To address this gap, we compared body weight perception of 56 female participants of normal weight using a VR application. They either (a) self-embodied a photorealistic, non-personalized virtual human and performed body movements in front of a virtual mirror or (b) only observed the virtual human as other's avatar (or agent) performing the same movements in front of them. Afterward, participants had to estimate the virtual human's body weight. Additionally, we considered the influence of the participants' body mass index (BMI) on the estimations and captured the participants' feelings of presence and embodiment. Participants estimated the body weight of the virtual human as their embodied self-avatars significantly lower compared to participants rating the virtual human as other's avatar. Furthermore, the estimations of body weight were significantly predicted by the participant's BMI with embodiment, but not without. Our results clearly highlight embodiment as an important factor influencing the perception of virtual humans' body weights in VR.}, author = {Wolf, Erik and Merdan, Nathalie and Döllinger, Nina and Mal, David and Wienrich, Carolin and Botsch, Mario and Latoschik, Marc Erich}, booktitle = {Proceedings of the 28th IEEE Virtual Reality Conference (VR '21)}, keywords = {ewolf myown vitras}, title = {The Embodiment of Photorealistic Avatars Influences Female Body Weight Perception in Virtual Reality}, year = 2021 }
19.
Seybold, J.: Examining the Netcode of Old, Open-sourced Video Games, (2021).
[ Abstract ] [ BibTeX ]
 
Video games have a long history of often competitive multiplayer modes, supported by various network implementations in their engines. The source code of many of these games has been open sourced over the years, opening their netcode up for examination. Your job is to extract the netcode from some of these games and compare them to each other. We want to find out, how the employed mechanisms have changed over time and how well they would fare in today's environment.
@mastersthesis{info3-praktikum-2020-6, abstract = {Video games have a long history of often competitive multiplayer modes, supported by various network implementations in their engines. The source code of many of these games has been open sourced over the years, opening their netcode up for examination. Your job is to extract the netcode from some of these games and compare them to each other. We want to find out, how the employed mechanisms have changed over time and how well they would fare in today's environment.}, author = {Seybold, Jörn}, keywords = {myown ua-net fullstack abschlussarbeit}, month = 3, school = {University of Würzburg}, title = {Examining the Netcode of Old, Open-sourced Video Games}, year = 2021 }
20.
Sichermann, M.: Evaluting the Mobile Internet Experience in Bavaria from End User Perspective, (2021).
[ Abstract ] [ BibTeX ]
 
Derzeit gibt es sogenannte Datenprovider (siehe zB www.tutela.com), die über Mobile Apps Leistungsmessungen von 5G-Mobilfunknetzen machen. In dieser Arbeit sollen diverse Monitoring-Lösungen und -Konzepte, die im großen Umfang die Leistung von 5G bestimmen können (zB über Mobile Apps), untersucht werden. Bei Interesse und für weitere Details bitte melden! Florian Wamser
@mastersthesis{info3-bachelor-2020-16, abstract = {Derzeit gibt es sogenannte Datenprovider (siehe zB www.tutela.com), die über Mobile Apps Leistungsmessungen von 5G-Mobilfunknetzen machen. In dieser Arbeit sollen diverse Monitoring-Lösungen und -Konzepte, die im großen Umfang die Leistung von 5G bestimmen können (zB über Mobile Apps), untersucht werden. Bei Interesse und für weitere Details bitte melden! Florian Wamser}, author = {Sichermann, Marleen}, keywords = {myown can}, school = {University of Würzburg}, title = {Evaluting the Mobile Internet Experience in Bavaria from End User Perspective}, year = 2021 }
21.
Supervisor: Wehner, N.: Flow-based Web QoE Monitoring for Encrypted Network Traffic, (2021).
[ Abstract ] [ BibTeX ]
 
Contact: nikolas.wehner@uni-wuerzburg.de The goal of this work is to estimate Web QoE KPIs like the Real-User-Monitoring Speed Index (RUMSI) or Page Load Time (PLT) directly from encrypted network traces using flow-based information only. This requires a reasonable feature extraction and engineering process as well as the use of machine learning techniques. Therefore, different feature sets and models shall be tested, e.g., using the response times of flows and modelling the data as time series. These approaches are however subject to change. The data for this work will be provided.
@mastersthesis{info3-bachelor-2020-21, abstract = {Contact: nikolas.wehner@uni-wuerzburg.de The goal of this work is to estimate Web QoE KPIs like the Real-User-Monitoring Speed Index (RUMSI) or Page Load Time (PLT) directly from encrypted network traces using flow-based information only. This requires a reasonable feature extraction and engineering process as well as the use of machine learning techniques. Therefore, different feature sets and models shall be tested, e.g., using the response times of flows and modelling the data as time series. These approaches are however subject to change. The data for this work will be provided.}, author = {Supervisor: Wehner, Nikolas}, keywords = {myown ucn}, school = {University of Würzburg}, title = {Flow-based Web QoE Monitoring for Encrypted Network Traffic}, year = 2021 }
22.
Supervisor: Seufert, A.: Evaluating the Influence of the Measurement Design on Mobile Video Streaming Behavior, (2021).
[ Abstract ] [ BibTeX ]
 
Contact: anika.seufert@informatik.uni-wuerzburg.de -- Inhalt: Der weltweite Videoverkehr hat in den letzten Jahren dramatisch zugenommen. Mit diesem rasanten Wachstum steigt auch das Interesse am Anwendungsverhalten von Video-Streaming-Diensten und dem daraus resultierenden Benutzererlebnis. Insbesondere besteht die Notwendigkeit, die Auswirkungen der Systemparameter auf die Streaming-Leistung zu verstehen. Daher wurden verschiedene Überwachungsansätze entwickelt, um groß angelegte automatisierte Messungen zu ermöglichen, z. B. Ansätze für Messungen, die direkt auf den Smartphones der Endnutzer laufen, um Einblicke in deren Perspektive auf die Video-Streaming-Qualität zu erhalten. In einigen Fällen liefen die Messungen im Vordergrund und maßen Key Performance Indicators (KPIs), während die Benutzer Videos ansahen. In anderen Fällen wurden die Messungen im Hintergrund durchgeführt, ohne dass der Benutzer dies überhaupt bemerkte. Ziel dieser Arbeit ist es daher, die Frage zu beantworten, ob und inwieweit das Mess-Setup (z. B. Vordergrund oder Hintergrund) das Video-Streaming-Verhalten beeinflusst und ob die Ergebnisse der beiden Methoden vergleichbar sind. -- Abstract: Global video traffic has increased dramatically in recent years. With this rapid growth, there is also increasing interest in the application behavior of video streaming services and the resulting user experience. In particular, there is a need to understand the impact of system parameters on streaming performance. Therefore, various monitoring approaches have been developed to enable large-scale automated measurements, e.g., approaches for measurements running directly on end-users' smartphones to gain insights of their perspective on video streaming quality. In some cases, the measurements ran in the foreground, measuring key performance indicators (KPIs) while users were watching videos. In other cases, the measurements are done in the background without the user even noticing. This work therefore aims to answer the question of whether and to what extent the measurement setup (e.g., foreground or background) affects video streaming behavior and whether the results of the two methods are comparable.
@mastersthesis{info3-bachelor-2020-18, abstract = {Contact: anika.seufert@informatik.uni-wuerzburg.de – Inhalt: Der weltweite Videoverkehr hat in den letzten Jahren dramatisch zugenommen. Mit diesem rasanten Wachstum steigt auch das Interesse am Anwendungsverhalten von Video-Streaming-Diensten und dem daraus resultierenden Benutzererlebnis. Insbesondere besteht die Notwendigkeit, die Auswirkungen der Systemparameter auf die Streaming-Leistung zu verstehen. Daher wurden verschiedene Überwachungsansätze entwickelt, um groß angelegte automatisierte Messungen zu ermöglichen, z. B. Ansätze für Messungen, die direkt auf den Smartphones der Endnutzer laufen, um Einblicke in deren Perspektive auf die Video-Streaming-Qualität zu erhalten. In einigen Fällen liefen die Messungen im Vordergrund und maßen Key Performance Indicators (KPIs), während die Benutzer Videos ansahen. In anderen Fällen wurden die Messungen im Hintergrund durchgeführt, ohne dass der Benutzer dies überhaupt bemerkte. Ziel dieser Arbeit ist es daher, die Frage zu beantworten, ob und inwieweit das Mess-Setup (z. B. Vordergrund oder Hintergrund) das Video-Streaming-Verhalten beeinflusst und ob die Ergebnisse der beiden Methoden vergleichbar sind. – Abstract: Global video traffic has increased dramatically in recent years. With this rapid growth, there is also increasing interest in the application behavior of video streaming services and the resulting user experience. In particular, there is a need to understand the impact of system parameters on streaming performance. Therefore, various monitoring approaches have been developed to enable large-scale automated measurements, e.g., approaches for measurements running directly on end-users' smartphones to gain insights of their perspective on video streaming quality. In some cases, the measurements ran in the foreground, measuring key performance indicators (KPIs) while users were watching videos. In other cases, the measurements are done in the background without the user even noticing. This work therefore aims to answer the question of whether and to what extent the measurement setup (e.g., foreground or background) affects video streaming behavior and whether the results of the two methods are comparable.}, author = {Supervisor: Seufert, Anika}, keywords = {myown}, school = {University of Würzburg}, title = {Evaluating the Influence of the Measurement Design on Mobile Video Streaming Behavior}, year = 2021 }
23.
Supervisor: Wamser, F.: Aufbau eines Blockchain-Testbeds, (2021).
[ Abstract ] [ BibTeX ]
 
Im Praktikum soll ein Blockchain-Testbed aufgebaut werden. Wichtig ist, dass der Anwendungsfall Ressourcenvergabe in Cloud-Systemen berücksichtigt wird. Hierbei sollen mittels Blockchain Ressourcen gekauft und an Nutzer vergeben werden können. Das Testbed soll verschiedene Orte der Nutzer, die die Blockchain verwenden, abbilden. Hierzu müssen Latenzen zwischen Nutzern emuliert werden.
@mastersthesis{info3-praktikum-2020-9, abstract = {Im Praktikum soll ein Blockchain-Testbed aufgebaut werden. Wichtig ist, dass der Anwendungsfall Ressourcenvergabe in Cloud-Systemen berücksichtigt wird. Hierbei sollen mittels Blockchain Ressourcen gekauft und an Nutzer vergeben werden können. Das Testbed soll verschiedene Orte der Nutzer, die die Blockchain verwenden, abbilden. Hierzu müssen Latenzen zwischen Nutzern emuliert werden.}, author = {Supervisor: Wamser, Florian}, keywords = {myown can}, school = {University of Würzburg}, title = {Aufbau eines Blockchain-Testbeds}, year = 2021 }
24.
Supervisor: Dietz, K.: Setup of a Tcpreplay-Server, (2021).
[ Abstract ] [ BibTeX ]
 
Tcpreplay [1, 2] is a tool to replay and edit so-called "packet captures" (pcaps), i.e., previously recorded network traffic. Originally, Tcpreplay was envisaged for the repeated playback of suspicious or malicious network patterns in the context of network security [2] to train algorithms for the detection of such network attacks. For an improved understanding and evaluation of such usecases, the goal of this student project is the setup of a Tcpreplay server. The functionality of the set up server shall be further extended, so that selected criteria of the pcaps can be edited without changing the resulting application behavior of a connected client. Finally, a validation of the implemented replay-functionality shall be conducted. [1] https://github.com/appneta/tcpreplay [2] https://tcpreplay.appneta.com/
@mastersthesis{info3-praktikum-2020-10, abstract = {Tcpreplay [1, 2] is a tool to replay and edit so-called "packet captures" (pcaps), i.e., previously recorded network traffic. Originally, Tcpreplay was envisaged for the repeated playback of suspicious or malicious network patterns in the context of network security [2] to train algorithms for the detection of such network attacks. For an improved understanding and evaluation of such usecases, the goal of this student project is the setup of a Tcpreplay server. The functionality of the set up server shall be further extended, so that selected criteria of the pcaps can be edited without changing the resulting application behavior of a connected client. Finally, a validation of the implemented replay-functionality shall be conducted. [1] https://github.com/appneta/tcpreplay [2] https://tcpreplay.appneta.com/}, author = {Supervisor: Dietz, Katharina}, keywords = {myown ucn}, school = {University of Würzburg}, title = {Setup of a Tcpreplay-Server}, year = 2021 }
25.
Supervisor: Wehner, N.: Network Traffic Forecasting Using Transformers, (2021).
[ Abstract ] [ BibTeX ]
 
Contact: nikolas.wehner@uni-wuerzburg.de The goal of this work is to perform a feasibility check whether it is possible to accurately forecast network traffic after having observed the start of a web page request. Therefore, the autoregressive Transformer architecture of the NLP domain shall be transferred to the networking domain. Network traffic for various websites will be provided.
@mastersthesis{info3-bachelor-2021-13, abstract = {Contact: nikolas.wehner@uni-wuerzburg.de The goal of this work is to perform a feasibility check whether it is possible to accurately forecast network traffic after having observed the start of a web page request. Therefore, the autoregressive Transformer architecture of the NLP domain shall be transferred to the networking domain. Network traffic for various websites will be provided.}, author = {Supervisor: Wehner, Nikolas}, keywords = {myown ucn}, school = {University of Würzburg}, title = {Network Traffic Forecasting Using Transformers}, year = 2021 }
26.
Wamser, F.: Bewertung und Analyse von 5G-Mobilfunk: Grundlagen zu Crowdsourcing-basierten 5G-Mobilfunkmessungen, (2021).
[ Abstract ] [ BibTeX ]
 
In der Arbeit sollen Grundlagen zu Crowdsourcing-basierten 5G-Mobilfunkmessungen erarbeitet werden. Crowdsourcing-basierten 5G-Mobilfunkmessungen sind Messungen, die mit Mobilfunk-Apps oder Internet-Webseiten mit Hilfe eine Masse von Leuten erhoben werden. Diese Messungen sind oft nicht verlässlich und haben je nach Person und Geräte unterschiedliche Qualität.
@mastersthesis{info3-master-2020-8, abstract = {In der Arbeit sollen Grundlagen zu Crowdsourcing-basierten 5G-Mobilfunkmessungen erarbeitet werden. Crowdsourcing-basierten 5G-Mobilfunkmessungen sind Messungen, die mit Mobilfunk-Apps oder Internet-Webseiten mit Hilfe eine Masse von Leuten erhoben werden. Diese Messungen sind oft nicht verlässlich und haben je nach Person und Geräte unterschiedliche Qualität.}, author = {Wamser, Florian}, keywords = {myown can}, school = {University of Wuerzburg}, title = {Bewertung und Analyse von 5G-Mobilfunk: Grundlagen zu Crowdsourcing-basierten 5G-Mobilfunkmessungen}, year = 2021 }
27.
Supervisor: Wehner, N.: Investigating the Relationship of Network Data Arrival and the Rendering Process in a Browser, (2021).
[ Abstract ] [ BibTeX ]
 
Contact: nikolas.wehner@uni-wuerzburg.de When trying to estimate Web Browsing Quality of Experience (QoE) from encrypted network traffic, the browser acts like a black box. However, the main influence factor for Web QoE are loading times and thus the time when a browser paints content is also crucial for Web QoE. The goal of this work is thus to unveil the impact of browsers on Web QoE. Therefore, the relationship between network data arrival and rendering process in a browser shall be analysed and modelled. Network traffic for various websites and browsers as well as important browser rendering events have already been captured and will be provided.
@mastersthesis{info3-bachelor-2021-12, abstract = {Contact: nikolas.wehner@uni-wuerzburg.de When trying to estimate Web Browsing Quality of Experience (QoE) from encrypted network traffic, the browser acts like a black box. However, the main influence factor for Web QoE are loading times and thus the time when a browser paints content is also crucial for Web QoE. The goal of this work is thus to unveil the impact of browsers on Web QoE. Therefore, the relationship between network data arrival and rendering process in a browser shall be analysed and modelled. Network traffic for various websites and browsers as well as important browser rendering events have already been captured and will be provided.}, author = {Supervisor: Wehner, Nikolas}, keywords = {myown ucn}, school = {University of Würzburg}, title = {Investigating the Relationship of Network Data Arrival and the Rendering Process in a Browser}, year = 2021 }
28.
Chaplick, S., Kindermann, P., Klawitter, J., Rutter, I., Wolff, A.: Extending Partial Representations of Rectangular Duals with Given Contact Orientations. In: Calamoneri, T. (hrsg.) Proc. 12th International Conference on Algorithms and Complexity (CIAC’21). Springer-Verlag (2021).
[ BibTeX ]
 
@inproceedings{ckkrw-eprrd-CIAC21, author = {Chaplick, Steven and Kindermann, Philipp and Klawitter, Jonathan and Rutter, Ignaz and Wolff, Alexander}, booktitle = {Proc. 12th International Conference on Algorithms and Complexity (CIAC'21)}, editor = {Calamoneri, Tiziana}, keywords = {myown}, note = {To appear.}, publisher = {Springer-Verlag}, series = {Lecture Notes in Computer Science}, title = {Extending Partial Representations of Rectangular Duals with Given Contact Orientations}, year = 2021 }
29.
Wienrich, C., Latoschik, M.E.: eXtended Artificial Intelligence: New Prospects of Human-AI Interaction Research. arXiv. (2021).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
Artificial Intelligence (AI) covers a broad spectrum of computational problems and use cases. Many of those implicate profound and sometimes intricate questions of how humans interact or should interact with AIs. Moreover, many users or future users do have abstract ideas of what AI is, significantly depending on the specific embodiment of AI applications. Human-centered-design approaches would suggest evaluating the impact of different embodiments on human perception of and interaction with AI. An approach that is difficult to realize due to the sheer complexity of application fields and embodiments in reality. However, here XR opens new possibilities to research human-AI interactions. The article's contribution is twofold: First, it provides a theoretical treatment and model of human-AI interaction based on an XR-AI continuum as a framework for and a perspective of different approaches of XR-AI combinations. It motivates XR-AI combinations as a method to learn about the effects of prospective human-AI interfaces and shows why the combination of XR and AI fruitfully contributes to a valid and systematic investigation of human-AI interactions and interfaces. Second, the article provides two exemplary experiments investigating the aforementioned approach for two distinct AI-systems. The first experiment reveals an interesting gender effect in human-robot interaction, while the second experiment reveals an Eliza effect of a recommender system. Here the article introduces two paradigmatic implementations of the proposed XR testbed for human-AI interactions and interfaces and shows how a valid and systematic investigation can be conducted. In sum, the article opens new perspectives on how XR benefits human-centered AI design and development.
@article{wienrich2021extended, abstract = {Artificial Intelligence (AI) covers a broad spectrum of computational problems and use cases. Many of those implicate profound and sometimes intricate questions of how humans interact or should interact with AIs. Moreover, many users or future users do have abstract ideas of what AI is, significantly depending on the specific embodiment of AI applications. Human-centered-design approaches would suggest evaluating the impact of different embodiments on human perception of and interaction with AI. An approach that is difficult to realize due to the sheer complexity of application fields and embodiments in reality. However, here XR opens new possibilities to research human-AI interactions. The article's contribution is twofold: First, it provides a theoretical treatment and model of human-AI interaction based on an XR-AI continuum as a framework for and a perspective of different approaches of XR-AI combinations. It motivates XR-AI combinations as a method to learn about the effects of prospective human-AI interfaces and shows why the combination of XR and AI fruitfully contributes to a valid and systematic investigation of human-AI interactions and interfaces. Second, the article provides two exemplary experiments investigating the aforementioned approach for two distinct AI-systems. The first experiment reveals an interesting gender effect in human-robot interaction, while the second experiment reveals an Eliza effect of a recommender system. Here the article introduces two paradigmatic implementations of the proposed XR testbed for human-AI interactions and interfaces and shows how a valid and systematic investigation can be conducted. In sum, the article opens new perspectives on how XR benefits human-centered AI design and development.}, author = {Wienrich, Carolin and Latoschik, Marc Erich}, journal = {arXiv}, keywords = {myown}, number = {2103.15004}, title = {eXtended Artificial Intelligence: New Prospects of Human-AI Interaction Research}, year = 2021 }
30.
Supervisor: Wamser, F.: Analyse von neuen Video Streaming-Konzepten, (2021).
[ Abstract ] [ BibTeX ]
 
In dieser Arbeit sollen neue Ideen und Konzepte für das HTTP Adaptive Video Streaming à la YouTube und Netflix analysiert und umgesetzt werden. Es sollen Streaming-Plattformen praktisch gemessen werden. Die neuen Konzepte haben zum Ziel das Streaming-Erlebnis zu verbessern und höhere Qualitäten zu liefern. Weitere Details auf Anfrage. Bitte direkt bei mir melden! Florian
@mastersthesis{info3-bachelor-2020-15, abstract = {In dieser Arbeit sollen neue Ideen und Konzepte für das HTTP Adaptive Video Streaming à la YouTube und Netflix analysiert und umgesetzt werden. Es sollen Streaming-Plattformen praktisch gemessen werden. Die neuen Konzepte haben zum Ziel das Streaming-Erlebnis zu verbessern und höhere Qualitäten zu liefern. Weitere Details auf Anfrage. Bitte direkt bei mir melden! Florian}, author = {Supervisor: Wamser, Florian}, keywords = {myown can}, school = {University of Wuerzburg}, title = {Analyse von neuen Video Streaming-Konzepten}, year = 2021 }
31.
Schmitt, P.: Exploratory Comparison of Contemporary Cloud Gaming Services, (2021).
[ Abstract ] [ BibTeX ]
 
Recently, Cloud Gaming services have once again risen in popularity, with more and more commercial offerings becoming available. Your job in this thesis would be to investigate and compare these services on a technical level and based on their network characteristics.
@mastersthesis{info3-bachelor-2020-19, abstract = {Recently, Cloud Gaming services have once again risen in popularity, with more and more commercial offerings becoming available. Your job in this thesis would be to investigate and compare these services on a technical level and based on their network characteristics.}, author = {Schmitt, Patrick}, keywords = {myown fullstack}, month = 4, school = {University of Würzburg}, title = {Exploratory Comparison of Contemporary Cloud Gaming Services}, year = 2021 }
32.
Arslanian, A.: QoE Study for Compatible Video and Web Browsing QoE Models, (2021).
[ Abstract ] [ BibTeX ]
 
Contact: nikolas.wehner@uni-wuerzburg.de Abstract: Video streaming and web browsing are the dominant applications in the Internet today. Quality of Experience (QoE) is a concept introduced to describe the delight or frustration with a networked service. For both video streaming and web browsing, several QoE models have been proposed in literature. However, one persisting problem is the incompatiblity of these QoE models. As a consequence, modelling QoE for sessions including both video and web is an impossible task. Goal of this work is to design, implement, and conduct a QoE study which investigates both video streaming and web browsing within a session. The obtained results of the QoE study are then evaluated in order to propose compatible QoE models.
@mastersthesis{info3-bachelor-2020-12, abstract = {Contact: nikolas.wehner@uni-wuerzburg.de Abstract: Video streaming and web browsing are the dominant applications in the Internet today. Quality of Experience (QoE) is a concept introduced to describe the delight or frustration with a networked service. For both video streaming and web browsing, several QoE models have been proposed in literature. However, one persisting problem is the incompatiblity of these QoE models. As a consequence, modelling QoE for sessions including both video and web is an impossible task. Goal of this work is to design, implement, and conduct a QoE study which investigates both video streaming and web browsing within a session. The obtained results of the QoE study are then evaluated in order to propose compatible QoE models.}, author = {Arslanian, Alice}, keywords = {myown ucn}, school = {University of Würzburg}, title = {QoE Study for Compatible Video and Web Browsing QoE Models}, year = 2021 }
33.
Supervisor: Wamser, F.: Blockchain in communication networks, (2021).
[ Abstract ] [ BibTeX ]
 
Das Ziel der Arbeit ist der Entwurf einer Methodik für die Ressourcenvergabe mittels Distributed Ledger-Verfahren (DLV) (Blockchain) im Netzwerk- und Anwendungsumfeld von Internetdiensten. Ein Beispiel für eine solche Ressourcenvergabe ergibt sich für aktuelle Webdienste wie Netflix. Netflix stellt seinen Dienst aus zahlreichen Einzelkomponenten zusammen: beispielsweise dem Videoplayer und den Videoinhalten. Diese Elemente liegen und werden in verschiedenen Clouds ausgeführt. Netflix muss sich Ressourcen bei verschiedenen Anbietern "zusammenkaufen". Solch ein zusammengestellter Dienst braucht einen Verteilungsalgorithmus, der Komponenten auf Clouds zuordnet. Die Idee in der Arbeit ist zu prüfen in wie fern man Blockchain hierfür nutzen kann, um Ressourcen zu buchen. Aufgaben in der Arbeit wären Konzepte und Ideen abzuleiten, die für die Ressourcenvergabe mittels Blockchain nötig sind. Eine weitere Aufgabe ist eine Literaturrecherche im Umfeld Blockchain.
@mastersthesis{info3-bachelor-2020-14, abstract = {Das Ziel der Arbeit ist der Entwurf einer Methodik für die Ressourcenvergabe mittels Distributed Ledger-Verfahren (DLV) (Blockchain) im Netzwerk- und Anwendungsumfeld von Internetdiensten. Ein Beispiel für eine solche Ressourcenvergabe ergibt sich für aktuelle Webdienste wie Netflix. Netflix stellt seinen Dienst aus zahlreichen Einzelkomponenten zusammen: beispielsweise dem Videoplayer und den Videoinhalten. Diese Elemente liegen und werden in verschiedenen Clouds ausgeführt. Netflix muss sich Ressourcen bei verschiedenen Anbietern "zusammenkaufen". Solch ein zusammengestellter Dienst braucht einen Verteilungsalgorithmus, der Komponenten auf Clouds zuordnet. Die Idee in der Arbeit ist zu prüfen in wie fern man Blockchain hierfür nutzen kann, um Ressourcen zu buchen. Aufgaben in der Arbeit wären Konzepte und Ideen abzuleiten, die für die Ressourcenvergabe mittels Blockchain nötig sind. Eine weitere Aufgabe ist eine Literaturrecherche im Umfeld Blockchain.}, author = {Supervisor: Wamser, Florian}, keywords = {myown can}, school = {University of Würzburg}, title = {Blockchain in communication networks}, year = 2021 }
34.
Supervisor: Seufert, M.: Identifying User Behavior from Encrypted Video Streaming Traffic, (2021).
[ Abstract ] [ BibTeX ]
 
Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Identifying User Behavior from Encrypted Video Streaming Traffic Abstract: In this work, existing PC- and app-based measurement frameworks have to be modified to conduct video streaming measurements with emulated user interactions. Application and network layer streaming information shall be extracted and analyzed to identify the emulated user interactions from the encrypted streaming traffic. Titel: Indentifizierung von Nutzerverhalten aus verschlüsseltem Videostreaming-Netzwerkverkehr Inhalt: In dieser Arbeit sollen existierende PC- und App-basierte Messframeworks modifiziert werden, um Messungen von Videostreaming durchzuführen und Nutzerinteraktionen zu emulieren. Streaminginformationen sollen auf Applikations- und Netzwerkschicht extrahiert werden, um die emulierten Nutzerinteraktionen aus dem verschlüsselten Videostreaming-Netzwerkverkehr zu identifizieren.
@mastersthesis{info3-praktikum-2019-3, abstract = {Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Identifying User Behavior from Encrypted Video Streaming Traffic Abstract: In this work, existing PC- and app-based measurement frameworks have to be modified to conduct video streaming measurements with emulated user interactions. Application and network layer streaming information shall be extracted and analyzed to identify the emulated user interactions from the encrypted streaming traffic. Titel: Indentifizierung von Nutzerverhalten aus verschlüsseltem Videostreaming-Netzwerkverkehr Inhalt: In dieser Arbeit sollen existierende PC- und App-basierte Messframeworks modifiziert werden, um Messungen von Videostreaming durchzuführen und Nutzerinteraktionen zu emulieren. Streaminginformationen sollen auf Applikations- und Netzwerkschicht extrahiert werden, um die emulierten Nutzerinteraktionen aus dem verschlüsselten Videostreaming-Netzwerkverkehr zu identifizieren.}, author = {Supervisor: Seufert, Michael}, keywords = {myown}, school = {University of Würzburg}, title = {Identifying User Behavior from Encrypted Video Streaming Traffic}, year = 2021 }
35.
Supervisor: Wehner, N.: Dashboard for Analysis of (Real-Time) Web Measurements, (2021).
[ Abstract ] [ BibTeX ]
 
Contact: nikolas.wehner@uni-wuerzburg.de Abstract: Goal of this work is to implement a Dashboard which characterizes (encrypted) network traffic measurements by displaying key performance indicators, in particular for web measurements. The backend and sample data will be provided. The technology for the implementation of dashboard can be chosen freely.
@mastersthesis{info3-praktikum-2021-6, abstract = {Contact: nikolas.wehner@uni-wuerzburg.de Abstract: Goal of this work is to implement a Dashboard which characterizes (encrypted) network traffic measurements by displaying key performance indicators, in particular for web measurements. The backend and sample data will be provided. The technology for the implementation of dashboard can be chosen freely.}, author = {Supervisor: Wehner, Nikolas}, keywords = {myown}, school = {University of Würzburg}, title = {Dashboard for Analysis of (Real-Time) Web Measurements}, year = 2021 }
36.
Leidinger, F.: Measuring the Effectiveness of Latency Mitigation Methods with a Prototype Video Game, (2021).
[ Abstract ] [ BibTeX ]
 
Video games with a competitive multiplayer modes must deal with the troubles of high and varying end-to-end lag. They can employ varying methods to manage, mitigate or conceal this lag and equalize it between different clients. But the closed source nature of video games makes examining the effectiveness of these mechanisms hard. Your job is to implement a simple video game prototype from scratch that uses an authoritative client-server multiplayer approach and implements such lag mitigation mechanisms. With this prototype we want to get a better understanding of the effectiveness of these lag concealment measures.
@mastersthesis{info3-master-2020-4, abstract = {Video games with a competitive multiplayer modes must deal with the troubles of high and varying end-to-end lag. They can employ varying methods to manage, mitigate or conceal this lag and equalize it between different clients. But the closed source nature of video games makes examining the effectiveness of these mechanisms hard. Your job is to implement a simple video game prototype from scratch that uses an authoritative client-server multiplayer approach and implements such lag mitigation mechanisms. With this prototype we want to get a better understanding of the effectiveness of these lag concealment measures.}, author = {Leidinger, Ferdinand}, keywords = {myown ua-net fullstack abschlussarbeit}, month = 4, school = {University of Würzburg}, title = {Measuring the Effectiveness of Latency Mitigation Methods with a Prototype Video Game}, year = 2021 }
37.
Theiner, M.: Profiling the E2E Delays of Streamed Video Games with the Camera Method, (2021).
[ Abstract ] [ BibTeX ]
 
Determining the E2E lag of actions in video games is not trivial since there is no built-in way to grasp the full lag, including that contributed by the input and output. A standardized method is to record both input and output with a high framerate camera and count the frames from a visible input event to the result on screen. Your job is to perform these measurements for different actions in a series of games, and examine the overhead game streaming generates for them. Note: It might currently not be possible to perform these experiments, as they rely on a physical testbench.
@mastersthesis{info3-bachelor-2020-6, abstract = {Determining the E2E lag of actions in video games is not trivial since there is no built-in way to grasp the full lag, including that contributed by the input and output. A standardized method is to record both input and output with a high framerate camera and count the frames from a visible input event to the result on screen. Your job is to perform these measurements for different actions in a series of games, and examine the overhead game streaming generates for them. Note: It might currently not be possible to perform these experiments, as they rely on a physical testbench.}, author = {Theiner, Markus}, keywords = {myown ua-net fullstack abschlussarbeit}, month = 3, school = {University of Würzburg}, title = {Profiling the E2E Delays of Streamed Video Games with the Camera Method}, year = 2021 }
38.
Supervisor: Loh, F.: Demand Study and Performance Evaluation of Future Smart City Networks, (2021).
[ Abstract ] [ BibTeX ]
 
Zukünftige Netze müssen durch den steigenden Einsatz von Smart City Technologien sowie einer höheren Anzahl an Geräten im Netz durch vermehrten Sensor- und IoT Einsatz angepasst werden. Dafür soll in der Arbeit untersucht werden, wie sich in Zukunft die Verkehrslast verändert. Dies kann mittels Messung, Simulation, oder Analyse betrachtet werden.
@mastersthesis{info3-master-2020-5, abstract = {Zukünftige Netze müssen durch den steigenden Einsatz von Smart City Technologien sowie einer höheren Anzahl an Geräten im Netz durch vermehrten Sensor- und IoT Einsatz angepasst werden. Dafür soll in der Arbeit untersucht werden, wie sich in Zukunft die Verkehrslast verändert. Dies kann mittels Messung, Simulation, oder Analyse betrachtet werden.}, author = {Supervisor: Loh, Frank}, keywords = {myown 5mart}, school = {University of Würzburg}, title = {Demand Study and Performance Evaluation of Future Smart City Networks}, year = 2021 }
39.
Supervisor: Dietz, K.: Comparison and Evaluation of Compatibility of Existing Data Sets for Intrusion Detection, (2021).
[ Abstract ] [ BibTeX ]
 
The acquisition of adequate data is a crucial concern for Machine Learning (ML) and especially network security. Throughout the years, many publicly available data sets were released. One of the most cited data sets in this regard are the KDD-CUP-99 data set and its variation NL-KDD. Both suffer from obvious problems, like the age and imbalanced composition of the data. However, newer data sets have been created, e.g., through real-world measurements, simulation or a hybrid form of both. The goal of this thesis is to evaluate a variety of data sets on their own, but also compare them concerning their intercompatibility regarding training and testing for ML. This also includes the analysis of various factors, such as the underlying network structure (e.g., size and type), temporal classification and induced traffic (e.g., type of traffic and attacks or network load).
@mastersthesis{info3-bachelor-2021-6, abstract = {The acquisition of adequate data is a crucial concern for Machine Learning (ML) and especially network security. Throughout the years, many publicly available data sets were released. One of the most cited data sets in this regard are the KDD-CUP-99 data set and its variation NL-KDD. Both suffer from obvious problems, like the age and imbalanced composition of the data. However, newer data sets have been created, e.g., through real-world measurements, simulation or a hybrid form of both. The goal of this thesis is to evaluate a variety of data sets on their own, but also compare them concerning their intercompatibility regarding training and testing for ML. This also includes the analysis of various factors, such as the underlying network structure (e.g., size and type), temporal classification and induced traffic (e.g., type of traffic and attacks or network load).}, author = {Supervisor: Dietz, Katharina}, keywords = {myown ucn}, school = {University of Würzburg}, title = {Comparison and Evaluation of Compatibility of Existing Data Sets for Intrusion Detection}, year = 2021 }
40.
Grigorjew, A., Seufert, M., Wehner, N., Hofmann, J., Hoßfeld, T.: ML-Assisted Latency Assignments in Time-Sensitive Networking. IFIP/IEEE International Symposium on Integrated Network Management (IM 2021). , Bordeaux, France (Virtual Conference) (2021).
[ Abstract ] [ BibTeX ]
 
Recent developments in industrial automation and invehicle communication have raised the requirements of real-time networking. Bus systems that were traditionally deployed in these fields cannot provide sufficient bandwidth and are now shifting towards Ethernet for their real-time communication needs. In this field, standardization efforts from the IEEE and the IETF have developed new data plane mechanisms such as shapers and schedulers, as well as control plane mechanisms such as reservation protocols to support their new requirements. However, their implementation and their optimal configuration remain an important factor for their efficiency. This work presents a machine learning framework that takes on the configuration task. Four different models are trained for the configuration of per-hop latency guarantees in a distributed resource reservation process and compared with respect to their real-time traffic capacity. The evaluation shows that all models provide good configurations for the provided scenarios, but more importantly, they represent a first step for a semi-automated configuration of parameters in Time-Sensitive Networking.
@inproceedings{info3-inproceedings-2021-2, abstract = {Recent developments in industrial automation and invehicle communication have raised the requirements of real-time networking. Bus systems that were traditionally deployed in these fields cannot provide sufficient bandwidth and are now shifting towards Ethernet for their real-time communication needs. In this field, standardization efforts from the IEEE and the IETF have developed new data plane mechanisms such as shapers and schedulers, as well as control plane mechanisms such as reservation protocols to support their new requirements. However, their implementation and their optimal configuration remain an important factor for their efficiency. This work presents a machine learning framework that takes on the configuration task. Four different models are trained for the configuration of per-hop latency guarantees in a distributed resource reservation process and compared with respect to their real-time traffic capacity. The evaluation shows that all models provide good configurations for the provided scenarios, but more importantly, they represent a first step for a semi-automated configuration of parameters in Time-Sensitive Networking.}, address = {Bordeaux, France (Virtual Conference)}, author = {Grigorjew, Alexej and Seufert, Michael and Wehner, Nikolas and Hofmann, Jan and Hoßfeld, Tobias}, booktitle = {IFIP/IEEE International Symposium on Integrated Network Management (IM 2021)}, keywords = {myown kikdin}, month = 5, title = {ML-Assisted Latency Assignments in Time-Sensitive Networking}, year = 2021 }
41.
Wehner, N., Seufert, M., Wieser, V., Casas, P., Capdehourat, G.: Quality that Matters: QoE Monitoring in Education Service Provider (ESP) Networks. IFIP/IEEE International Symposium on Integrated Network Management (IM 2021). , Bordeaux, France (Virtual Conference) (2021).
[ Abstract ] [ BibTeX ]
 
Education Service Providers (ESPs) play a crucial role in the digitization of education as they equip students and teachers with reliable devices and provide high quality Internet access at schools. This paper investigates four months worth of continuous measurements conducted by an ESP using a largescale, passive, in-device Quality of Experience (QoE) monitoring system deployed into a nationwide network of education-purpose devices. These measurements cover more than 800 education centers and about 4000 devices, used both in schools and at home. Using this rich dataset, we present an exhaustive characterization of the browsing behavior, and a quantification of the web and video QoE in this educational context. Web QoE results showed a better performance for school Wi-Fi networks compared to home connections, suggesting that several issues may arise for ESPs due to the increasing relevance of home-schooling caused by the COVID-19 pandemic.
@inproceedings{info3-inproceedings-2021-3, abstract = {Education Service Providers (ESPs) play a crucial role in the digitization of education as they equip students and teachers with reliable devices and provide high quality Internet access at schools. This paper investigates four months worth of continuous measurements conducted by an ESP using a largescale, passive, in-device Quality of Experience (QoE) monitoring system deployed into a nationwide network of education-purpose devices. These measurements cover more than 800 education centers and about 4000 devices, used both in schools and at home. Using this rich dataset, we present an exhaustive characterization of the browsing behavior, and a quantification of the web and video QoE in this educational context. Web QoE results showed a better performance for school Wi-Fi networks compared to home connections, suggesting that several issues may arise for ESPs due to the increasing relevance of home-schooling caused by the COVID-19 pandemic.}, address = {Bordeaux, France (Virtual Conference)}, author = {Wehner, Nikolas and Seufert, Michael and Wieser, Viktoria and Casas, Pedro and Capdehourat, Germán}, booktitle = {IFIP/IEEE International Symposium on Integrated Network Management (IM 2021)}, keywords = {myown ucn}, month = 5, title = {Quality that Matters: QoE Monitoring in Education Service Provider (ESP) Networks}, year = 2021 }
42.
Supervisor: Metzger, F.: Accessible System Monitoring for Community LPWAN Networks, (2021).
[ Abstract ] [ BibTeX ]
 
Smart city applications and community LPWAN installations are on the rise and hit practical hurdles and limitations, like the limited unlicensed radio resources ("Tragedy of the Commons"). But how do you provide those communities with accessible information on the network and application health and enable them to manage and improve their network? Our approach is to adopt lessons from other research fields and combine information quality models with geospatial visualizations. Your Task would be to produce produce practical realizations of this approach (in simulation or testbed) and test their feasibility.
@mastersthesis{info3-master-2021-4, abstract = {Smart city applications and community LPWAN installations are on the rise and hit practical hurdles and limitations, like the limited unlicensed radio resources ("Tragedy of the Commons"). But how do you provide those communities with accessible information on the network and application health and enable them to manage and improve their network? Our approach is to adopt lessons from other research fields and combine information quality models with geospatial visualizations. Your Task would be to produce produce practical realizations of this approach (in simulation or testbed) and test their feasibility.}, author = {Supervisor: Metzger, Florian}, keywords = {myown}, month = 2, school = {University of Würzburg}, title = {Accessible System Monitoring for Community LPWAN Networks}, year = 2021 }
43.
Hamzeheinejad, N., Roth, D., Monty, S., Breuer, J., Rodenberg, A., Latoschik, M.E.: The Impact of Implicit and Explicit Feedback on Performance and Experience during VR-Supported Motor Rehabilitation. Proceedings of the 28th IEEE Virtual Reality Conference (VR ’21) (2021).
[ Abstract ] [ BibTeX ] [ URL ]
 
This paper examines the impact of implicit and explicit feedback in Virtual Reality (VR) on performance and user experience during motor rehabilitation. In this work, explicit feedback consists of visual and auditory cues provided by a virtual trainer, compared to traditional feedback provided by a real physiotherapist. Implicit feedback was generated by the walking motion of the virtual trainer accompanying the patient during virtual walks. Here, the potential synchrony of movements between the trainer and trainee is intended to create an implicit visual affordance of motion adaption. We hypothesize that this will stimulate the activation of mirror neurons, thus fostering neuroadaptive processes. We conducted a clinical user study in a rehabilitation center employing a gait robot. We investigated the performance outcome and subjective experience of four resulting VR-supported rehabilitation conditions: with/without explicit feedback, and with/without implicit (synchronous motion) stimulation by a virtual trainer. We further included two baseline conditions reflecting the current NonVR procedure in the rehabilitation center. Our results show that additional feedback generally resulted in better patient performance, objectively assessed by the necessary applied support force of the robot. Additionally, our VR supported rehabilitation procedure improved enjoyment and satisfaction, while no negative impacts could be observed. Implicit feedback and adapted motion synchrony by the virtual trainer led to higher mental demand, giving rise to hopes of increased neural activity and neuroadaptive stimulation.
@inproceedings{hamzeheinejad2021impact, abstract = {This paper examines the impact of implicit and explicit feedback in Virtual Reality (VR) on performance and user experience during motor rehabilitation. In this work, explicit feedback consists of visual and auditory cues provided by a virtual trainer, compared to traditional feedback provided by a real physiotherapist. Implicit feedback was generated by the walking motion of the virtual trainer accompanying the patient during virtual walks. Here, the potential synchrony of movements between the trainer and trainee is intended to create an implicit visual affordance of motion adaption. We hypothesize that this will stimulate the activation of mirror neurons, thus fostering neuroadaptive processes. We conducted a clinical user study in a rehabilitation center employing a gait robot. We investigated the performance outcome and subjective experience of four resulting VR-supported rehabilitation conditions: with/without explicit feedback, and with/without implicit (synchronous motion) stimulation by a virtual trainer. We further included two baseline conditions reflecting the current NonVR procedure in the rehabilitation center. Our results show that additional feedback generally resulted in better patient performance, objectively assessed by the necessary applied support force of the robot. Additionally, our VR supported rehabilitation procedure improved enjoyment and satisfaction, while no negative impacts could be observed. Implicit feedback and adapted motion synchrony by the virtual trainer led to higher mental demand, giving rise to hopes of increased neural activity and neuroadaptive stimulation.}, author = {Hamzeheinejad, Negin and Roth, Daniel and Monty, Samantha and Breuer, Julian and Rodenberg, Anuschka and Latoschik, Marc Erich}, booktitle = {Proceedings of the 28th IEEE Virtual Reality Conference (VR '21)}, keywords = {myown vrgait}, title = {The Impact of Implicit and Explicit Feedback on Performance and Experience during VR-Supported Motor Rehabilitation}, year = 2021 }
44.
Vomhoff, V.: Investigating IoT-centric signaling traffic at the MVNO Mobile Core - Modeling and ClassificationInvestigating IoT-centric signaling traffic at the MVNO Mobile Core - Modeling and Classification, (2021).
[ BibTeX ]
 
@mastersthesis{info3-master-2021-3, author = {Vomhoff, Viktoria}, keywords = {myown}, month = 1, school = {University of Wuerzburg}, title = {Investigating IoT-centric signaling traffic at the MVNO Mobile Core - Modeling and ClassificationInvestigating IoT-centric signaling traffic at the MVNO Mobile Core - Modeling and Classification}, year = 2021 }
45.
Geissler, S., Lange, S., Tran-Gia, P., Hoßfeld, T.: Discrete-time Analysis of Multicomponent GI/GI/1 Queueing Networks. Conference on Networked Systems (NetSys) (2021).
[ Abstract ] [ BibTeX ]
 
In this work, we provide initial insights regarding the error introduced into multicomponent queueing systems by assuming the departure processes of arbitrary GI/GI/1-∞ queues to be renewal processes. To this end, we compute the sojourn time distribution as well as departure distributions of a linear chain of queueing components and compare the results to a simulation of the same system. By applying the renewal approximation, potential autocorrelations of the departure processes are lost. We investigate the magnitude of this error regarding both the sojourn time as well as interdeparture time distributions for a broad set of parameters. Although more indepth studies are needed, our results show that both distributions can be closely approximated, which allows the application of the model to asses the performance of real world NFV function chains.
@inproceedings{info3-inproceedings-2021-4, abstract = {In this work, we provide initial insights regarding the error introduced into multicomponent queueing systems by assuming the departure processes of arbitrary GI/GI/1-∞ queues to be renewal processes. To this end, we compute the sojourn time distribution as well as departure distributions of a linear chain of queueing components and compare the results to a simulation of the same system. By applying the renewal approximation, potential autocorrelations of the departure processes are lost. We investigate the magnitude of this error regarding both the sojourn time as well as interdeparture time distributions for a broad set of parameters. Although more indepth studies are needed, our results show that both distributions can be closely approximated, which allows the application of the model to asses the performance of real world NFV function chains.}, author = {Geissler, Stefan and Lange, Stanislav and Tran-Gia, Phuoc and Hoßfeld, Tobias}, booktitle = {Conference on Networked Systems (NetSys)}, keywords = {myown}, month = 11, title = {Discrete-time Analysis of Multicomponent GI/GI/1 Queueing Networks}, year = 2021 }
46.
Supervisor: Dietz, K.: Application- and Version-Classification via Machine Learning, (2021).
[ Abstract ] [ BibTeX ]
 
The classification of application-behavior via ML is a well-studied topic. For the most part, however, only the classification of highly-varying applications has been conducted, i.e., applications that differ greatly from each other and thus, are easily differentiable. The goal of this thesis is the generation of a small and manually created data set, containing communication traffic not only from highly-varying applications, but also applications from the same family (e.g., different VoIP applications). In the next step, the classification of these similar applications is evaluated. Another possible subtask may be the classification of different versions of the same application. Especially this last subtask is an interesting aspect for detecting unpatched applications, and thus, possible weak points in a system.
@mastersthesis{info3-bachelor-2021-7, abstract = {The classification of application-behavior via ML is a well-studied topic. For the most part, however, only the classification of highly-varying applications has been conducted, i.e., applications that differ greatly from each other and thus, are easily differentiable. The goal of this thesis is the generation of a small and manually created data set, containing communication traffic not only from highly-varying applications, but also applications from the same family (e.g., different VoIP applications). In the next step, the classification of these similar applications is evaluated. Another possible subtask may be the classification of different versions of the same application. Especially this last subtask is an interesting aspect for detecting unpatched applications, and thus, possible weak points in a system.}, author = {Supervisor: Dietz, Katharina}, keywords = {myown ucn}, school = {University of Würzburg}, title = {Application- and Version-Classification via Machine Learning}, year = 2021 }
47.
Geissler, S., Wamser, F., Bauer, W., Krolikowski, M., Gebert, S., Hoßfeld, T.: Signaling Traffic in Internet-of-Things Mobile Networks. IFIP/IEEE International Symposium on Integrated Network Management (IM 2021). , Bordeaux, France (Virtual Conference) (2021).
[ BibTeX ]
 
@inproceedings{info3-inproceedings-2021-1, address = {Bordeaux, France (Virtual Conference)}, author = {Geissler, Stefan and Wamser, Florian and Bauer, Wolfang and Krolikowski, Michael and Gebert, Steffen and Hoßfeld, Tobias}, booktitle = {IFIP/IEEE International Symposium on Integrated Network Management (IM 2021)}, keywords = {myown 5cale can}, month = 5, title = {Signaling Traffic in Internet-of-Things Mobile Networks}, year = 2021 }
48.
Ebner, M.: Performance Prediction of Distributed SDN-Architectures via Simulation and Machine Learning, (2021).
[ Abstract ] [ BibTeX ]
 
In recent years, Software-Defined Networking (SDN) emerged as an innovative network architecture and gained increasing popularity due to its centralized network management. However, this central point induces a potential bottleneck and possible single-point-of-failure to the network. Therefore, so-called distributed architectures come into play, which keep the logical view centralized, but physically distributed. The goal of this thesis is to evaluate two opposing approaches and predict their performance via Machine Learning (ML). The simulation will be conducted on basis of a preexisting framework based on OMNeT++, which already implements two distributed SDN-architectures, ready for simulation.
@mastersthesis{info3-bachelor-2021-9, abstract = {In recent years, Software-Defined Networking (SDN) emerged as an innovative network architecture and gained increasing popularity due to its centralized network management. However, this central point induces a potential bottleneck and possible single-point-of-failure to the network. Therefore, so-called distributed architectures come into play, which keep the logical view centralized, but physically distributed. The goal of this thesis is to evaluate two opposing approaches and predict their performance via Machine Learning (ML). The simulation will be conducted on basis of a preexisting framework based on OMNeT++, which already implements two distributed SDN-architectures, ready for simulation.}, author = {Ebner, Markus}, keywords = {myown}, school = {University of Würzburg}, title = {Performance Prediction of Distributed SDN-Architectures via Simulation and Machine Learning}, year = 2021 }
49.
Supervisor: Geissler, S.: Design and Implementation of a WebApp for the Performance Evaluation of VNF Chains, (2021).
[ Abstract ] [ BibTeX ]
 
Goal of this work is the design and implementation of a web-based application that allows the graphical configuration of service function chains (SFC). An underlying backend (written in R) should then perform detailed performance evaluation (discrete-time modeling, simulation) of the designed SFC and generate several key performance indicators of the system.
@mastersthesis{info3-praktikum-2021-4, abstract = {Goal of this work is the design and implementation of a web-based application that allows the graphical configuration of service function chains (SFC). An underlying backend (written in R) should then perform detailed performance evaluation (discrete-time modeling, simulation) of the designed SFC and generate several key performance indicators of the system.}, author = {Supervisor: Geissler, Stefan}, keywords = {myown}, school = {University of Wuerzburg}, title = {Design and Implementation of a WebApp for the Performance Evaluation of VNF Chains}, year = 2021 }
50.
Walter, J., Zink, J., Baumeister, J., Wolff, A.: Layered Drawing of Undirected Graphs with Generalized Port Constraints. In: Auber, D. und Valtr, P. (hrsg.) Proc. 28th Int. Symp. Graph Drawing & Network Vis. (GD’20). S. 220–234. Springer-Verlag (2021).
[ BibTeX ] [ DOI ]
 
@inproceedings{wzbw-ldugg-GD20, author = {Walter, Julian and Zink, Johannes and Baumeister, Joachim and Wolff, Alexander}, booktitle = {Proc. 28th Int. Symp. Graph Drawing \& Network Vis. (GD'20)}, editor = {Auber, David and Valtr, Pavel}, keywords = {myown}, pages = {220–234}, publisher = {Springer-Verlag}, series = {Lecture Notes in Computer Science}, title = {Layered Drawing of Undirected Graphs with Generalized Port Constraints}, volume = 12590, year = 2021 }
51.
Supervisor: Loh, F.: Studying the Influence of Mobility in an IoT Network with LoRaWAN, (2021).
[ Abstract ] [ BibTeX ]
 
Ziel der Arbeit ist es eine Methodik zu entwickeln, um Mobilität in einem LoRaNetz zu bestimmen.
@mastersthesis{info3-bachelor-2021-10, abstract = {Ziel der Arbeit ist es eine Methodik zu entwickeln, um Mobilität in einem LoRaNetz zu bestimmen.}, author = {Supervisor: Loh, Frank}, keywords = {myown}, school = {University of Würzburg}, title = {Studying the Influence of Mobility in an IoT Network with LoRaWAN}, year = 2021 }
52.
Oberdörfer, S., Heidrich, D., Birnstiel, S., Latoschik, M.E.: Measuring the Effects of Virtual Environment Design on Decision-Making. Proceedings of the 28th IEEE Conference on Virtual Reality and 3D User Interfaces Abstracts and Workshops (VR ’21). S. 442–443. IEEE (2021).
[ BibTeX ] [ URL ] [ DOI ]
 
@inproceedings{oberdorfer2021measuring, author = {Oberdörfer, Sebastian and Heidrich, David and Birnstiel, Sandra and Latoschik, Marc Erich}, booktitle = {Proceedings of the 28th IEEE Conference on Virtual Reality and 3D User Interfaces Abstracts and Workshops (VR '21)}, keywords = {myown oberdoerfer}, month = {March}, organization = {IEEE}, pages = {442-443}, title = {Measuring the Effects of Virtual Environment Design on Decision-Making}, year = 2021 }
53.
Oberdörfer, S., Straka, S., Latoschik, M.E.: Effects of Immersion and Visual Angle on Brand Placement Effectiveness. Proceedings of the 28th IEEE Conference on Virtual Reality and 3D User Interfaces Abstracts and Workshops (VR ’21). S. 440–441. IEEE (2021).
[ BibTeX ] [ URL ] [ DOI ]
 
@inproceedings{oberdorfer2021effects, author = {Oberdörfer, Sebastian and Straka, Samantha and Latoschik, Marc Erich}, booktitle = {Proceedings of the 28th IEEE Conference on Virtual Reality and 3D User Interfaces Abstracts and Workshops (VR '21)}, keywords = {myown oberdoerfer}, month = {March}, organization = {IEEE}, pages = {440-441}, title = {Effects of Immersion and Visual Angle on Brand Placement Effectiveness}, year = 2021 }
54.
Bartl, A., Jung, S., Kullmann, P., Wenninger, S., Achenbach, J., Wolf, E., Schell, C., Lindeman, R.W., Botsch, M., Latoschik, M.E.: Self-Avatars in Virtual Reality: A Study Protocol for Investigating the Impact of the Deliberateness of Choice and the Context-Match. Proceedings of the 28th IEEE Virtual Reality conference (VR ’21). IEEE (2021).
[ BibTeX ] [ URL ] [ DOI ]
 
@inproceedings{bartl2021selfavatars, author = {Bartl, Andrea and Jung, Sungchul and Kullmann, Peter and Wenninger, Stephan and Achenbach, Jascha and Wolf, Erik and Schell, Christian and Lindeman, Robert W. and Botsch, Mario and Latoschik, Marc Erich}, booktitle = {Proceedings of the 28th IEEE Virtual Reality conference (VR '21)}, keywords = {ewolf myown}, month = {March}, organization = {IEEE}, title = {Self-Avatars in Virtual Reality: A Study Protocol for Investigating the Impact of the Deliberateness of Choice and the Context-Match}, year = 2021 }
55.
Supervisor: Loh, F.: Studying mobility in a LoRaWAN Network, (2021).
[ BibTeX ]
 
@mastersthesis{info3-praktikum-2021-3, author = {Supervisor: Loh, Frank}, keywords = {myown 5mart}, school = {University of Würzburg}, title = {Studying mobility in a LoRaWAN Network}, year = 2021 }
56.
Supervisor: Seufert, A.: Investigating the Influence of Transmission Delays on the QoE of Mobile Instant Messaging, (2021).
[ Abstract ] [ BibTeX ]
 
Kontakt/Contact: anika.seufert@informatik.uni-wuerzburg.de -- Inhalt: WhatsApp ist eine der beliebtesten mobilen Instant Messaging (MIM)-Anwendungen. Aufgrund von MIM-Anwendungen hat sich die Art und Weise, wie wir kommunizieren, drastisch verändert. Dennoch gibt es nur sehr wenige Studien über die Quality of Experience (QoE) und deren Einflussfaktoren. Das Ziel dieser Arbeit ist es daher, die QoE von MIM-Anwendungen zu evaluieren. Dazu wird eine Web-MIM-Applikation entworfen, um verschiedene mögliche Einflussfaktoren auf die QoE zu simulieren (z.B. Bildladezeiten). Anschließend wird eine subjektive Nutzerstudie durchgeführt und QoE-Bewertungen zur simulierten Verschlechterung gesammelt und ausgewertet. -- Abstract: WhatsApp is one of the most popular mobile instant messaging (MIM) applications. Due to MIM applications, the way we communicate has changed drastically. Nevertheless, there are very few studies about its Quality of Experience (QoE) and possible influence factors. Thus, the goal of this work is to evaluate the QoE MIM apps. Therefore, a web MIM application will be designed to simulate different possible influence factors on the QoE (e.g., image load times). Afterwards, a subjective user study will be conducted and QoE ratings on the simulated degradation will be collected and evaluated.
@mastersthesis{info3-bachelor-2021-5, abstract = {Kontakt/Contact: anika.seufert@informatik.uni-wuerzburg.de – Inhalt: WhatsApp ist eine der beliebtesten mobilen Instant Messaging (MIM)-Anwendungen. Aufgrund von MIM-Anwendungen hat sich die Art und Weise, wie wir kommunizieren, drastisch verändert. Dennoch gibt es nur sehr wenige Studien über die Quality of Experience (QoE) und deren Einflussfaktoren. Das Ziel dieser Arbeit ist es daher, die QoE von MIM-Anwendungen zu evaluieren. Dazu wird eine Web-MIM-Applikation entworfen, um verschiedene mögliche Einflussfaktoren auf die QoE zu simulieren (z.B. Bildladezeiten). Anschließend wird eine subjektive Nutzerstudie durchgeführt und QoE-Bewertungen zur simulierten Verschlechterung gesammelt und ausgewertet. – Abstract: WhatsApp is one of the most popular mobile instant messaging (MIM) applications. Due to MIM applications, the way we communicate has changed drastically. Nevertheless, there are very few studies about its Quality of Experience (QoE) and possible influence factors. Thus, the goal of this work is to evaluate the QoE MIM apps. Therefore, a web MIM application will be designed to simulate different possible influence factors on the QoE (e.g., image load times). Afterwards, a subjective user study will be conducted and QoE ratings on the simulated degradation will be collected and evaluated.}, author = {Supervisor: Seufert, Anika}, keywords = {myown}, school = {University of Würzburg}, title = {Investigating the Influence of Transmission Delays on the QoE of Mobile Instant Messaging}, year = 2021 }
57.
Supervisor: Wamser, F.: Blockchain in cloud and communication networks, (2021).
[ Abstract ] [ BibTeX ]
 
Das Ziel der Masterarbeit ist der Entwurf einer Methodik für die Ressourcenvergabe mittels Distributed Ledger-Verfahren (DLV) (Blockchain) im Netzwerk- und Anwendungsumfeld von Internetdiensten. Ein Beispiel für eine solche Ressourcenvergabe ergibt sich für aktuelle Webdienste wie Netflix. Netflix stellt seinen Dienst aus zahlreichen Einzelkomponenten zusammen: beispielsweise dem Videoplayer und den Videoinhalten. Diese Elemente liegen und werden in verschiedenen Clouds ausgeführt. Netflix muss sich Ressourcen bei verschiedenen Anbietern "zusammenkaufen". Solch ein zusammengestellter Dienst braucht einen Verteilungsalgorithmus, der Komponenten auf Clouds zuordnet. Die Idee in der Arbeit ist zu prüfen in wie fern man Blockchain hierfür nutzen kann, um Ressourcen zu buchen. Aufgaben in der Arbeit wären der Aufbau eines experiementellen Blockchain-Testbeds.
@mastersthesis{info3-master-2020-3, abstract = {Das Ziel der Masterarbeit ist der Entwurf einer Methodik für die Ressourcenvergabe mittels Distributed Ledger-Verfahren (DLV) (Blockchain) im Netzwerk- und Anwendungsumfeld von Internetdiensten. Ein Beispiel für eine solche Ressourcenvergabe ergibt sich für aktuelle Webdienste wie Netflix. Netflix stellt seinen Dienst aus zahlreichen Einzelkomponenten zusammen: beispielsweise dem Videoplayer und den Videoinhalten. Diese Elemente liegen und werden in verschiedenen Clouds ausgeführt. Netflix muss sich Ressourcen bei verschiedenen Anbietern "zusammenkaufen". Solch ein zusammengestellter Dienst braucht einen Verteilungsalgorithmus, der Komponenten auf Clouds zuordnet. Die Idee in der Arbeit ist zu prüfen in wie fern man Blockchain hierfür nutzen kann, um Ressourcen zu buchen. Aufgaben in der Arbeit wären der Aufbau eines experiementellen Blockchain-Testbeds.}, author = {Supervisor: Wamser, Florian}, keywords = {myown can}, school = {University of Würzburg}, title = {Blockchain in cloud and communication networks}, year = 2021 }
58.
Steinhaeusser, S.C., Schaper, P., Akuffo, O.B., Friedrich, P., Ön, J., Lugrin, B.: Anthropomorphize me!. In: Bethel, C., Paiva, A., Broadbent, E., Feil-Seifer, D., und Szafir, D. (hrsg.) Companion of the 2021 ACM/IEEE International Conference on Human-Robot Interaction (HRI 2021). ACM (2021).
[ BibTeX ] [ URL ] [ DOI ]
 
@inproceedings{Steinhaeusser_2021, author = {Steinhaeusser, Sophia C. and Schaper, Philipp and Akuffo, Ohenewa Bediako and Friedrich, Paula and Ön, Jülide and Lugrin, Birgit}, booktitle = {Companion of the 2021 ACM/IEEE International Conference on Human-Robot Interaction (HRI 2021)}, editor = {Bethel, Cindy and Paiva, Ana and Broadbent, Elizabeth and Feil-Seifer, David and Szafir, Daniel}, keywords = {birgit mi myown schaper steinhaeusser storyteller}, publisher = {ACM}, title = {Anthropomorphize me!}, year = 2021 }
59.
Supervisor: Seufert, A.: Investigating the QoE of Mobile Instant Messaging, (2021).
[ Abstract ] [ BibTeX ]
 
Kontakt/Contact: anika.seufert@informatik.uni-wuerzburg.de -- Inhalt: WhatsApp ist eine der beliebtesten mobilen Instant Messaging (MIM)-Anwendungen. Aufgrund von MIM-Anwendungen hat sich die Art und Weise, wie wir kommunizieren, drastisch verändert. Dennoch gibt es nur sehr wenige Studien über die Quality of Experience (QoE) und deren Einflussfaktoren. Das Ziel dieser Arbeit ist es daher, die QoE von MIM-Anwendungen zu evaluieren. Dazu wird eine Web-MIM-Applikation entworfen, um verschiedene mögliche Einflussfaktoren auf die QoE zu simulieren (z.B. Bildladezeiten). Anschließend wird eine subjektive Nutzerstudie durchgeführt und QoE-Bewertungen zur simulierten Verschlechterung gesammelt und ausgewertet. -- Abstract: WhatsApp is one of the most popular mobile instant messaging (MIM) applications. Due to MIM applications, the way we communicate has changed drastically. Nevertheless, there are very few studies about its Quality of Experience (QoE) and possible influence factors. Thus, the goal of this work is to evaluate the QoE MIM apps. Therefore, a web MIM application will be designed to simulate different possible influence factors on the QoE (e.g., image load times). Afterwards, a subjective user study will be conducted and QoE ratings on the simulated degradation will be collected and evaluated.
@mastersthesis{info3-praktikum-2019-15, abstract = {Kontakt/Contact: anika.seufert@informatik.uni-wuerzburg.de – Inhalt: WhatsApp ist eine der beliebtesten mobilen Instant Messaging (MIM)-Anwendungen. Aufgrund von MIM-Anwendungen hat sich die Art und Weise, wie wir kommunizieren, drastisch verändert. Dennoch gibt es nur sehr wenige Studien über die Quality of Experience (QoE) und deren Einflussfaktoren. Das Ziel dieser Arbeit ist es daher, die QoE von MIM-Anwendungen zu evaluieren. Dazu wird eine Web-MIM-Applikation entworfen, um verschiedene mögliche Einflussfaktoren auf die QoE zu simulieren (z.B. Bildladezeiten). Anschließend wird eine subjektive Nutzerstudie durchgeführt und QoE-Bewertungen zur simulierten Verschlechterung gesammelt und ausgewertet. – Abstract: WhatsApp is one of the most popular mobile instant messaging (MIM) applications. Due to MIM applications, the way we communicate has changed drastically. Nevertheless, there are very few studies about its Quality of Experience (QoE) and possible influence factors. Thus, the goal of this work is to evaluate the QoE MIM apps. Therefore, a web MIM application will be designed to simulate different possible influence factors on the QoE (e.g., image load times). Afterwards, a subjective user study will be conducted and QoE ratings on the simulated degradation will be collected and evaluated.}, author = {Supervisor: Seufert, Anika}, keywords = {myown}, school = {University of Würzburg}, title = {Investigating the QoE of Mobile Instant Messaging}, year = 2021 }
60.
An, S.H.: Investigation of Timed Gates for Predictable Latency in Dynamic Networks, (2021).
[ Abstract ] [ BibTeX ]
 
Kontakt: alexej.grigorjew@uni-wuerzburg.de -- Moderne Systeme enthalten immer mehr Machine-to-Machine (M2M) Kommunikation, welche traditionell durch Bus-Systeme wie CAN und PROFIBUS unterstützt wurden. Neuere Systeme haben jedoch höhere Anforderungen an Bandbreite, Latenz und Zuverlässigkeit, weshalb langsam ein Übergang in Richtung Ethernet-Technologien stattfindet. Daraus entstanden sehr viele verschiedene Technologien, die im Grunde die gleichen Ziele verfolgen, aber untereinander nicht kompatibel sind. Die IEEE Standardisierungsgruppe Time-Sensitive Networking (TSN) versucht, durch diverse Erweiterungen der Ethernet-Standards eine einheitliche Definition der Mechanismen zu bilden. Ein bekannter Mechanismus zur Umsetzung von Echtzeitanforderungen sind Timed Gates. Dabei werden Gate Control Lists konfiguriert, die genau steuern, welcher Port im Netzwerk zu welcher Zeit senden darf, ähnlich wie bei Zugfahrplänen an Bahnhöfen. Oftmals erfolgt diese Konfiguration als globale Netzwerk-weite Optimierung, welche alle Switches genau auf einander abstimmt. Die dazu notwendige Rechenzeit erlaubt die Nutzung aber nur für statische Anwendungszwecke. In dynamischen Szenarien ändern sich die Verkehrsanforderungen regelmäßig, und entscheidungen müssen schneller getroffen werden. Stattdessen können Zeitfenster auch länger geöffnet bleiben, um eine ganze Reihe von Paketen übertragen zu können. Neue Verkehrsströme können dann dynamisch zu diesen Gruppen hinzugefügt werden, solange das Zeitfenster groß genug ist, ohne die Gate Control Lists neu zu berechnen. Sobald das Zeitfenster nicht mehr ausreicht, werden neue Verkehrsanfragen abgelehnt. Je länger ein Zeitfenster aber ist, desto mehr verzögert es jedoch die anderen Gruppen. Die Frage ist also, wie die Effizienz eines gegebenen Netzwerks von den Zeitfenstern abhängt. In dieser Arbeit soll ein kleines Framework geschrieben werden, das für ein gegebenes Netzwerk und für eine gegebene Zeitfensterkonfiguration berechnet, wie viele der Echtzeit-Verkehrsströme darin platziert werden können. In einer Parameterstudie soll damit empirisch ermittelt werden, wie die Effizienz einer Konfiguration von diesen Parametern abhängt.
@mastersthesis{info3-bachelor-2020-5, abstract = {Kontakt: alexej.grigorjew@uni-wuerzburg.de – Moderne Systeme enthalten immer mehr Machine-to-Machine (M2M) Kommunikation, welche traditionell durch Bus-Systeme wie CAN und PROFIBUS unterstützt wurden. Neuere Systeme haben jedoch höhere Anforderungen an Bandbreite, Latenz und Zuverlässigkeit, weshalb langsam ein Übergang in Richtung Ethernet-Technologien stattfindet. Daraus entstanden sehr viele verschiedene Technologien, die im Grunde die gleichen Ziele verfolgen, aber untereinander nicht kompatibel sind. Die IEEE Standardisierungsgruppe Time-Sensitive Networking (TSN) versucht, durch diverse Erweiterungen der Ethernet-Standards eine einheitliche Definition der Mechanismen zu bilden. Ein bekannter Mechanismus zur Umsetzung von Echtzeitanforderungen sind Timed Gates. Dabei werden Gate Control Lists konfiguriert, die genau steuern, welcher Port im Netzwerk zu welcher Zeit senden darf, ähnlich wie bei Zugfahrplänen an Bahnhöfen. Oftmals erfolgt diese Konfiguration als globale Netzwerk-weite Optimierung, welche alle Switches genau auf einander abstimmt. Die dazu notwendige Rechenzeit erlaubt die Nutzung aber nur für statische Anwendungszwecke. In dynamischen Szenarien ändern sich die Verkehrsanforderungen regelmäßig, und entscheidungen müssen schneller getroffen werden. Stattdessen können Zeitfenster auch länger geöffnet bleiben, um eine ganze Reihe von Paketen übertragen zu können. Neue Verkehrsströme können dann dynamisch zu diesen Gruppen hinzugefügt werden, solange das Zeitfenster groß genug ist, ohne die Gate Control Lists neu zu berechnen. Sobald das Zeitfenster nicht mehr ausreicht, werden neue Verkehrsanfragen abgelehnt. Je länger ein Zeitfenster aber ist, desto mehr verzögert es jedoch die anderen Gruppen. Die Frage ist also, wie die Effizienz eines gegebenen Netzwerks von den Zeitfenstern abhängt. In dieser Arbeit soll ein kleines Framework geschrieben werden, das für ein gegebenes Netzwerk und für eine gegebene Zeitfensterkonfiguration berechnet, wie viele der Echtzeit-Verkehrsströme darin platziert werden können. In einer Parameterstudie soll damit empirisch ermittelt werden, wie die Effizienz einer Konfiguration von diesen Parametern abhängt.}, author = {An, Soo Hyun}, keywords = {myown intedis}, school = {University of Wuerzburg}, title = {Investigation of Timed Gates for Predictable Latency in Dynamic Networks}, year = 2021 }
61.
Knaub, A.: Investigation of Stream Aggregates for Asynchronous Traffic Shaping, (2021).
[ Abstract ] [ BibTeX ]
 
Kontakt: alexej.grigorjew@uni-wuerzburg.de -- Moderne Systeme enthalten immer mehr Machine-to-Machine (M2M) Kommunikation, welche traditionell durch Bus-Systeme wie CAN und PROFIBUS unterstützt wurden. Neuere Systeme haben jedoch höhere Anforderungen an Bandbreite, Latenz und Zuverlässigkeit, weshalb langsam ein Übergang in Richtung Ethernet-Technologien stattfindet. Daraus entstanden sehr viele verschiedene Technologien, die im Grunde die gleichen Ziele verfolgen, aber untereinander nicht kompatibel sind. Die IEEE Standardisierungsgruppe Time-Sensitive Networking (TSN) versucht, durch diverse Erweiterungen der Ethernet-Standards eine einheitliche Definition der Mechanismen zu bilden. Ein solcher Mechanismus, der Echtzeit-Garantien ermöglicht, lautet Asynchronous Traffic Shaping (ATS). Zur Einhaltung der Garantien sind außerdem Reservierungsprotokolle im Einsatz. Ein neuer Echtzeit-Datenstrom sendet seine Anforderungen an das Netzwerk und wird entweder angenommen oder abgelehnt, je nach vorhandenen Ressourcen. Dabei geht es nicht nur um Bandbreite, sondern z.B. auch um Warteschlangenlängen und Prioritäten. Formeln zur Berechnung der Latenz existieren bereits in der Literatur. Diese sind jedoch von Natur aus ineffizient bei Datenströmen, die sehr selten senden (~ 1 Mal pro Sekunde). Sie verbrauchen ähnlich viele Warteschlangen-Ressourcen wie häufig sendende Ströme (~ 1 Mal pro Millisekunde), benötigen aber natürlich viel weniger Bandbreite. So kann eine Ablehnung schon dann erfolgen, wenn eigentlich kaum Verkehr fließt. Hier soll Stream Aggregation ansetzen. Viele sehr kleine Datenströme werden zu einem größeren Strom mit etwas höherer Bandbreite zusammengefasst, um die Ressourcen effizienter einsetzen zu können. Für ATS auf der Data-Plane erscheint das Aggregat wie ein einziger Strom. In dieser Arbeit soll ein kleines Framework zur Berechnung der Latenzgarantien in einem gegebenen Netzwerk geschrieben werden. Außerdem soll eine Möglichkeit zur Aggregation mehrerer Ströme eingebaut werden. In der Evaluation soll dann dieses Framework benutzt werden, um für einige Netzwerke exemplarisch die Effizienz mit und ohne Aggregation zu vergleichen.
@mastersthesis{info3-bachelor-2020-4, abstract = {Kontakt: alexej.grigorjew@uni-wuerzburg.de – Moderne Systeme enthalten immer mehr Machine-to-Machine (M2M) Kommunikation, welche traditionell durch Bus-Systeme wie CAN und PROFIBUS unterstützt wurden. Neuere Systeme haben jedoch höhere Anforderungen an Bandbreite, Latenz und Zuverlässigkeit, weshalb langsam ein Übergang in Richtung Ethernet-Technologien stattfindet. Daraus entstanden sehr viele verschiedene Technologien, die im Grunde die gleichen Ziele verfolgen, aber untereinander nicht kompatibel sind. Die IEEE Standardisierungsgruppe Time-Sensitive Networking (TSN) versucht, durch diverse Erweiterungen der Ethernet-Standards eine einheitliche Definition der Mechanismen zu bilden. Ein solcher Mechanismus, der Echtzeit-Garantien ermöglicht, lautet Asynchronous Traffic Shaping (ATS). Zur Einhaltung der Garantien sind außerdem Reservierungsprotokolle im Einsatz. Ein neuer Echtzeit-Datenstrom sendet seine Anforderungen an das Netzwerk und wird entweder angenommen oder abgelehnt, je nach vorhandenen Ressourcen. Dabei geht es nicht nur um Bandbreite, sondern z.B. auch um Warteschlangenlängen und Prioritäten. Formeln zur Berechnung der Latenz existieren bereits in der Literatur. Diese sind jedoch von Natur aus ineffizient bei Datenströmen, die sehr selten senden (  1 Mal pro Sekunde). Sie verbrauchen ähnlich viele Warteschlangen-Ressourcen wie häufig sendende Ströme (  1 Mal pro Millisekunde), benötigen aber natürlich viel weniger Bandbreite. So kann eine Ablehnung schon dann erfolgen, wenn eigentlich kaum Verkehr fließt. Hier soll Stream Aggregation ansetzen. Viele sehr kleine Datenströme werden zu einem größeren Strom mit etwas höherer Bandbreite zusammengefasst, um die Ressourcen effizienter einsetzen zu können. Für ATS auf der Data-Plane erscheint das Aggregat wie ein einziger Strom. In dieser Arbeit soll ein kleines Framework zur Berechnung der Latenzgarantien in einem gegebenen Netzwerk geschrieben werden. Außerdem soll eine Möglichkeit zur Aggregation mehrerer Ströme eingebaut werden. In der Evaluation soll dann dieses Framework benutzt werden, um für einige Netzwerke exemplarisch die Effizienz mit und ohne Aggregation zu vergleichen.}, author = {Knaub, Andrej}, keywords = {myown ats-performance}, school = {University of Wuerzburg}, title = {Investigation of Stream Aggregates for Asynchronous Traffic Shaping}, year = 2021 }
62.
Frank, F., Kaufmann, M., Kobourov, S., Mchedlidze, T., Pupyrev, S., Ueckerdt, T., Wolff, A.: Using the Metro-Map Metaphor for Drawing Hypergraphs. In: Bureš, T., Dondi, R., Gamper, J., Guerrini, G., Jurdziński, T., Pahl, C., Sikora, F., und Wong, P. (hrsg.) Proc. 47th Int. Conf. Current Trends Theory & Practice Comput. Sci. (SOFSEM’21). S. 361–372. Springer-Verlag (2021).
[ BibTeX ] [ DOI ]
 
@inproceedings{fkkmpuw-ummmdh-SOFSEM21, author = {Frank, Fabian and Kaufmann, Michael and Kobourov, Stephen and Mchedlidze, Tamara and Pupyrev, Sergey and Ueckerdt, Torsten and Wolff, Alexander}, booktitle = {Proc. 47th Int. Conf. Current Trends Theory \& Practice Comput. Sci. (SOFSEM'21)}, editor = {Bureš, Tomáš and Dondi, Riccardo and Gamper, Johann and Guerrini, Giovanna and Jurdziński, Tomasz and Pahl, Claus and Sikora, Florian and Wong, Prudence}, keywords = {myown}, pages = {361–372}, publisher = {Springer-Verlag}, series = {Lecture Notes in Computer Science}, title = {Using the Metro-Map Metaphor for Drawing Hypergraphs}, volume = 12607, year = 2021 }
63.
Supervisor: Loh, F.: A Simulative Approach to Study the Coverage of LoRaWAN in Würzburg, (2021).
[ Abstract ] [ BibTeX ]
 
In der Masterarbeit soll anhand von bereits vorliegenden Daten die Abdeckung eines LoRaWAN Netzes in Würzburg simuliert werden. Dabei sollen verschiedene Sensor- sowie Verkehrsmuster simuliert werden und der Einfluss auf eine Smart City untersucht werden.
@mastersthesis{info3-master-2019-11, abstract = {In der Masterarbeit soll anhand von bereits vorliegenden Daten die Abdeckung eines LoRaWAN Netzes in Würzburg simuliert werden. Dabei sollen verschiedene Sensor- sowie Verkehrsmuster simuliert werden und der Einfluss auf eine Smart City untersucht werden.}, author = {Supervisor: Loh, Frank}, keywords = {myown}, school = {University of Würzburg}, title = {A Simulative Approach to Study the Coverage of LoRaWAN in Würzburg}, year = 2021 }
64.
Supervisor: Wehner, N.: Implementation of a Low Latency QoE Fair HAS Logic, (2021).
[ Abstract ] [ BibTeX ]
 
Contact: nikolas.wehner@uni-wuerzburg.de Abstract: Nowadays, basically all videos are streamed via HTTP Adaptive Streaming (HAS). An important concept in terms of HAS is the Quality of Experience (QoE), which describes how users perceive video streaming. QoE fairness extends the concept of QoE by comparing the QoE of mutliple clients in a shared network. An important component influencing the QoE and consequently the QoE fairness is the HAS adaptation logic, which is responsible for downloading the segments with the goal to obtain the best possible video quality without causing stalling, i.e., playback interruption due to buffer underrun. The goal of this work is to implement an adaptation logic, currently implemented in a simulation, into a real video player and evaluating the QoE and QoE fairness of the adaptation logic when confronted with low-latency situations in real scenarios. (Also available as Bachelor's thesis)
@mastersthesis{info3-praktikum-2020-3, abstract = {Contact: nikolas.wehner@uni-wuerzburg.de Abstract: Nowadays, basically all videos are streamed via HTTP Adaptive Streaming (HAS). An important concept in terms of HAS is the Quality of Experience (QoE), which describes how users perceive video streaming. QoE fairness extends the concept of QoE by comparing the QoE of mutliple clients in a shared network. An important component influencing the QoE and consequently the QoE fairness is the HAS adaptation logic, which is responsible for downloading the segments with the goal to obtain the best possible video quality without causing stalling, i.e., playback interruption due to buffer underrun. The goal of this work is to implement an adaptation logic, currently implemented in a simulation, into a real video player and evaluating the QoE and QoE fairness of the adaptation logic when confronted with low-latency situations in real scenarios. (Also available as Bachelor's thesis)}, author = {Supervisor: Wehner, Nikolas}, keywords = {myown ucn}, school = {University of Würzburg}, title = {Implementation of a Low Latency QoE Fair HAS Logic}, year = 2021 }
65.
Arseneva, E., Kleist, L., Klemz, B., Löffler, M., Schulz, A., Vogtenhuber, B., Wolff, A.: Adjacency Graphs of Polyhedral Surfaces. In: Buchin, K. und Colin de Verdière, Éric (hrsg.) Proc. 37th Annu. Sympos. Comput. Geom. (SoCG’21). S. 52:1–52:17. Schloss Dagstuhl~-- Leibniz-Zentrum für Informatik (2021).
[ BibTeX ] [ DOI ]
 
@inproceedings{akklsvw-dgps-SoCG21, author = {Arseneva, Elena and Kleist, Linda and Klemz, Boris and L{ö}ffler, Maarten and Schulz, Andr{é} and Vogtenhuber, Birgit and Wolff, Alexander}, booktitle = {Proc. 37th Annu. Sympos. Comput. Geom. (SoCG'21)}, editor = {Buchin, Kevin and {Colin de Verdi{è}re}, {É}ric}, keywords = {contact_representation myown polyhedral_complexes realizability}, pages = {52:1–52:17}, publisher = {Schloss Dagstuhl – Leibniz-Zentrum f{ü}r Informatik}, series = {LIPIcs}, title = {Adjacency Graphs of Polyhedral Surfaces}, volume = 189, year = 2021 }
66.
Schweifler, R.: Evaluating the Impact of Browsing Delays on the QoE of Music Streaming, (2021).
[ Abstract ] [ BibTeX ]
 
Contact: anika.seufert@informatik.uni-wuerzburg.de -- Inhalt: Streaming wird heutzutage immer beliebter. Dazu zählt nicht nur das schon tiefgehend untersuchte Video-Streaming, auch Musik-Streaming über Applikationen wie Spotify wird immer populärer. Während bei Video-Streaming schon viele Untersuchungen zur Nutzerzufriedenheit und deren Einflussfaktoren gemacht wurden, gibt es bei Musik- bzw. Audio-Streaming bisher nur wenige Studien hierzu. In bisherigen QoE-Studien wurde das Streamen von Liedern separat von der verwendeten Applikation untersucht. Aus diesem Grund sollen in dieser Arbeit die Frage beantwortet werden, ob Nutzer den Musik-Stream als schlechter empfinden, wenn sie vorher eine schlechtere Erfahrung durch Browsing-Verzögerungen beim Benutzen der Applikation hatten. Dazu soll eine Web-Musik-Streaming-Applikation entworfen werden, um verschiedene Einflussfaktoren auf die QoE zu simulieren (z.B. Verzögerungen bei der Suche von Liedern oder beim Laden aller Titel einer Playliste). Anschließend wird eine subjektive Nutzerstudie durchgeführt und QoE-Bewertungen zur simulierten Verschlechterung gesammelt und ausgewertet. -- Abstract: Streaming is becoming more and more popular these days. This includes not only video streaming, which has already been studied in depth, but also music streaming via applications such as Spotify is becoming increasingly popular. While many studies have already been conducted on user satisfaction and its influencing factors for video streaming, there have only been a few studies on music and audio streaming. In previous QoE studies, the streaming of songs was examined separately from the application used. For this reason, this thesis aims to answer the question whether users perceive the music stream as worse if they previously had a worse experience due to browsing delays when using the application. For this purpose, a web music streaming application will be designed to simulate different factors influencing QoE (e.g., delays in searching songs or loading all tracks of a playlist). Subsequently, a subjective user study will be conducted and QoE ratings on the simulated degradation will be collected and evaluated.
@mastersthesis{info3-bachelor-2021-4, abstract = {Contact: anika.seufert@informatik.uni-wuerzburg.de – Inhalt: Streaming wird heutzutage immer beliebter. Dazu zählt nicht nur das schon tiefgehend untersuchte Video-Streaming, auch Musik-Streaming über Applikationen wie Spotify wird immer populärer. Während bei Video-Streaming schon viele Untersuchungen zur Nutzerzufriedenheit und deren Einflussfaktoren gemacht wurden, gibt es bei Musik- bzw. Audio-Streaming bisher nur wenige Studien hierzu. In bisherigen QoE-Studien wurde das Streamen von Liedern separat von der verwendeten Applikation untersucht. Aus diesem Grund sollen in dieser Arbeit die Frage beantwortet werden, ob Nutzer den Musik-Stream als schlechter empfinden, wenn sie vorher eine schlechtere Erfahrung durch Browsing-Verzögerungen beim Benutzen der Applikation hatten. Dazu soll eine Web-Musik-Streaming-Applikation entworfen werden, um verschiedene Einflussfaktoren auf die QoE zu simulieren (z.B. Verzögerungen bei der Suche von Liedern oder beim Laden aller Titel einer Playliste). Anschließend wird eine subjektive Nutzerstudie durchgeführt und QoE-Bewertungen zur simulierten Verschlechterung gesammelt und ausgewertet. – Abstract: Streaming is becoming more and more popular these days. This includes not only video streaming, which has already been studied in depth, but also music streaming via applications such as Spotify is becoming increasingly popular. While many studies have already been conducted on user satisfaction and its influencing factors for video streaming, there have only been a few studies on music and audio streaming. In previous QoE studies, the streaming of songs was examined separately from the application used. For this reason, this thesis aims to answer the question whether users perceive the music stream as worse if they previously had a worse experience due to browsing delays when using the application. For this purpose, a web music streaming application will be designed to simulate different factors influencing QoE (e.g., delays in searching songs or loading all tracks of a playlist). Subsequently, a subjective user study will be conducted and QoE ratings on the simulated degradation will be collected and evaluated.}, author = {Schweifler, Ralf}, keywords = {myown}, school = {University of Würzburg}, title = {Evaluating the Impact of Browsing Delays on the QoE of Music Streaming}, year = 2021 }
67.
Latoschik, M.E., Wienrich, C.: Coherence and Plausibility, not Presence?! Pivotal Conditions for XR Experiences and Effects, a Novel Model. arXiv. (2021).
[ Abstract ] [ BibTeX ] [ URL ]
 
Presence often is considered the most important quale describing the subjective feeling of being in a computer-generated (virtual) or computer-mediated environment. The identification and separation of two orthogonal presence components, i.e., the place illusion and the plausibility illusion, has been an accepted theoretical model describing Virtual Reality (VR) experiences for some time. In this model, immersion is a proposed contributing factor to the place illusion. Lately, copresence and social presence illusions have extended this model, and coherence was proposed as a contributing factor to the plausibility illusion. Such factors strive to identify (objectively) measurable characteristics of an experience, e.g., systems properties that allow controlled manipulations of VR experiences. This perspective article challenges this presence-oriented VR theory. First, we argue that a place illusion cannot be the major construct to describe the much wider scope of Virtual, Augmented, and Mixed Reality (VR, AR, MR: or XR for short). Second, we argue that there is no plausibility illusion but merely plausibility, and we derive the place illusion as a consequence of a plausible generation of spatial cues, and similarly for all of the current model's so-defined illusions. Finally, we propose coherence and plausibility to become the central essential conditions in a novel theoretical model describing XR experiences and effects.
@article{latoschik2021coherence, abstract = {Presence often is considered the most important quale describing the subjective feeling of being in a computer-generated (virtual) or computer-mediated environment. The identification and separation of two orthogonal presence components, i.e., the place illusion and the plausibility illusion, has been an accepted theoretical model describing Virtual Reality (VR) experiences for some time. In this model, immersion is a proposed contributing factor to the place illusion. Lately, copresence and social presence illusions have extended this model, and coherence was proposed as a contributing factor to the plausibility illusion. Such factors strive to identify (objectively) measurable characteristics of an experience, e.g., systems properties that allow controlled manipulations of VR experiences. This perspective article challenges this presence-oriented VR theory. First, we argue that a place illusion cannot be the major construct to describe the much wider scope of Virtual, Augmented, and Mixed Reality (VR, AR, MR: or XR for short). Second, we argue that there is no plausibility illusion but merely plausibility, and we derive the place illusion as a consequence of a plausible generation of spatial cues, and similarly for all of the current model's so-defined illusions. Finally, we propose coherence and plausibility to become the central essential conditions in a novel theoretical model describing XR experiences and effects.}, author = {Latoschik, Marc Erich and Wienrich, Carolin}, journal = {arXiv}, keywords = {myown}, number = {2104.04846}, title = {Coherence and Plausibility, not Presence?! Pivotal Conditions for XR Experiences and Effects, a Novel Model}, year = 2021 }
68.
Chaplick, S., Kindermann, P., Klawitter, J., Rutter, I., Wolff, A.: Extending Partial Representations of Rectangular Duals with Given Contact Orientations. In: Philippou, A. und Georgiou, C. (hrsg.) Proceedings of the 12th International Conference on Algorithms and Complexity (CIAC’21) (2021).
[ Abstract ] [ BibTeX ]
 
A rectangular dual of a graph G is a contact representation of G with axis-aligned rectangles such that (i) no four rectangles share a point and (ii) the union of all rectangles is a rectangle. The partial representation extension problem for rectangular duals asks whether a given partial rectangular dual can be extended to a rectangular dual, that is, whether there exists a rectangular dual where some vertices are represented by prescribed rectangles. Combinatorially, a rectangular dual can be described by a regular edge labeling (REL), which determines the orientations of the rectangle contacts. We characterize the RELs that admit an extension, which leads to a linear-time testing algorithm. In the affirmative, we can construct an extension in linear time.
@inproceedings{ckkrw-eprrd-ciac21, abstract = {A rectangular dual of a graph G is a contact representation of G with axis-aligned rectangles such that (i) no four rectangles share a point and (ii) the union of all rectangles is a rectangle. The partial representation extension problem for rectangular duals asks whether a given partial rectangular dual can be extended to a rectangular dual, that is, whether there exists a rectangular dual where some vertices are represented by prescribed rectangles. Combinatorially, a rectangular dual can be described by a regular edge labeling (REL), which determines the orientations of the rectangle contacts. We characterize the RELs that admit an extension, which leads to a linear-time testing algorithm. In the affirmative, we can construct an extension in linear time.}, author = {Chaplick, Steven and Kindermann, Philipp and Klawitter, Jonathan and Rutter, Ignaz and Wolff, Alexander}, booktitle = {Proceedings of the 12th International Conference on Algorithms and Complexity (CIAC'21)}, editor = {Philippou, Anna and Georgiou, Chryssis}, keywords = {myown}, note = {To appear}, title = {Extending Partial Representations of Rectangular Duals with Given Contact Orientations}, year = 2021 }
69.
Vomhoff, V.: Modeling 2G/3G MVNO IoT Signaling Traffic, (2021).
[ BibTeX ]
 
@mastersthesis{info3-master-2021-1, author = {Vomhoff, Viktoria}, keywords = {myown 5cale can}, month = 1, school = {University of Wuerzburg}, title = {Modeling 2G/3G MVNO IoT Signaling Traffic}, year = 2021 }
70.
Supervisor: Seufert, M.: Studying TCP/QUIC Performance for Competing Flow Access in a Testbed, (2021).
[ Abstract ] [ BibTeX ]
 
Contact/Kontakt: michael.seufert@uni-wuerzburg.de --- Abstract: In this project or thesis, a testbed shall be setup. The testbed shall emulate users, which browse web pages or stream videos via a shared link. The competition of the flows on the shared link shall be evaluated based on measurement studies in different scenarios. For this, especially the resulting Quality of Experience (QoE) shall be compared with respect to the used transport protocol, i.e., TCP or QUIC. --- Inhalt: In diesem Praktikum/Arbeit soll ein Testbed aufgebaut werden. Das Testbed soll Nutzer emulieren, die über einen gemeinsamen Link Webseiten browsen oder Videos streaming. Die Konkurrenzsituation auf dem geteilten Link soll mittels Messstudien in verschiedenen Szenarien ausgewertet werden. Dabei soll vor allem die resultierende QoE (Quality of Experience, subjektiv empfundene Dienstgüte) verglichen werden beim Einsatz von unterschiedlichen Transportprotokollen, nämlich TCP und QUIC.
@mastersthesis{info3-praktikum-2021-1, abstract = {Contact/Kontakt: michael.seufert@uni-wuerzburg.de — Abstract: In this project or thesis, a testbed shall be setup. The testbed shall emulate users, which browse web pages or stream videos via a shared link. The competition of the flows on the shared link shall be evaluated based on measurement studies in different scenarios. For this, especially the resulting Quality of Experience (QoE) shall be compared with respect to the used transport protocol, i.e., TCP or QUIC. — Inhalt: In diesem Praktikum/Arbeit soll ein Testbed aufgebaut werden. Das Testbed soll Nutzer emulieren, die über einen gemeinsamen Link Webseiten browsen oder Videos streaming. Die Konkurrenzsituation auf dem geteilten Link soll mittels Messstudien in verschiedenen Szenarien ausgewertet werden. Dabei soll vor allem die resultierende QoE (Quality of Experience, subjektiv empfundene Dienstgüte) verglichen werden beim Einsatz von unterschiedlichen Transportprotokollen, nämlich TCP und QUIC.}, author = {Supervisor: Seufert, Michael}, keywords = {myown}, school = {University of Würzburg}, title = {Studying TCP/QUIC Performance for Competing Flow Access in a Testbed}, year = 2021 }
71.
Supervisor: Seufert, M.: Performance Evaluation of Transfer Learning Approaches for QoE Estimation, (2021).
[ Abstract ] [ BibTeX ]
 
Contact/Kontakt: michael.seufert@uni-wuerzburg.de --- Abstract: In this bachelor thesis, transfer learning shall be applied to QoE estimation from monitored encrypted video streaming traffic. Based on an existing data set, several transfer learning methods shall be implemented and their performance shall be compared. --- Inhalt: In dieser Bachelorarbeit soll Transferlernen angewendet werden zur Abschätzung der QoE (Quality of Experience, subjektiv empfundenen Dienstgüte) aus aufgezeichnetem, verschlüsselten Videostreamingverkehr. Basierend auf einem existierenden Datensatz sollen verschiedene Methoden des Transferlernens implementiert werden und ihre Leistungsfähigkeit soll verglichen werden.
@mastersthesis{info3-bachelor-2021-1, abstract = {Contact/Kontakt: michael.seufert@uni-wuerzburg.de — Abstract: In this bachelor thesis, transfer learning shall be applied to QoE estimation from monitored encrypted video streaming traffic. Based on an existing data set, several transfer learning methods shall be implemented and their performance shall be compared. — Inhalt: In dieser Bachelorarbeit soll Transferlernen angewendet werden zur Abschätzung der QoE (Quality of Experience, subjektiv empfundenen Dienstgüte) aus aufgezeichnetem, verschlüsselten Videostreamingverkehr. Basierend auf einem existierenden Datensatz sollen verschiedene Methoden des Transferlernens implementiert werden und ihre Leistungsfähigkeit soll verglichen werden.}, author = {Supervisor: Seufert, Michael}, keywords = {myown}, school = {University of Würzburg}, title = {Performance Evaluation of Transfer Learning Approaches for QoE Estimation}, year = 2021 }
72.
Supervisor: Seufert, M.: Data Augmentation of Network Traffic Traces, (2021).
[ Abstract ] [ BibTeX ]
 
Contact/Kontakt: michael.seufert@uni-wuerzburg.de --- Abstract: In this project, several approaches to data augmentation for network traffic traces shall be implemented and evaluated. The goal is to generate synthetic traffic traces, which have almost identical properties to real traffic traces. This allows to reduce the amount of network traffic traces needed to train ML-based models. --- Inhalt: In diesem Praktikum sollen verschiedene Ansätze zur Datenanreicherung von Aufzeichnungen von Netzverkehr implementiert und evaluiert werden. Das Ziel ist es synthetische Verkehrsaufzeichnungen zu erzeugen, die beinahe identische Eigenschaften haben wie echte Verkehrsaufzeichnungen. Dies ermöglicht es die benötigte Menge von Aufzeichnungen von Netzverkehr beim Training von ML-basierten Modellen zu reduzieren.
@mastersthesis{info3-praktikum-2021-2, abstract = {Contact/Kontakt: michael.seufert@uni-wuerzburg.de — Abstract: In this project, several approaches to data augmentation for network traffic traces shall be implemented and evaluated. The goal is to generate synthetic traffic traces, which have almost identical properties to real traffic traces. This allows to reduce the amount of network traffic traces needed to train ML-based models. — Inhalt: In diesem Praktikum sollen verschiedene Ansätze zur Datenanreicherung von Aufzeichnungen von Netzverkehr implementiert und evaluiert werden. Das Ziel ist es synthetische Verkehrsaufzeichnungen zu erzeugen, die beinahe identische Eigenschaften haben wie echte Verkehrsaufzeichnungen. Dies ermöglicht es die benötigte Menge von Aufzeichnungen von Netzverkehr beim Training von ML-basierten Modellen zu reduzieren.}, author = {Supervisor: Seufert, Michael}, keywords = {myown}, school = {University of Würzburg}, title = {Data Augmentation of Network Traffic Traces}, year = 2021 }
73.
Supervisor: Seufert, M.: Comparison of Web and Video QoE Perception, (2021).
[ Abstract ] [ BibTeX ]
 
Contact/Kontakt: michael.seufert@uni-wuerzburg.de --- Abstract: In this thesis, an existing framework for subjective QoE studies shall be modified. Several QoE study shall be implemented and conducted, which compare and investigate in detail the fundamental perception of web browsing and video streaming. The results of the QoE studies shall be evaluated. --- In dieser Arbeit soll ein existierendes Framework für subjektive Befragungen zur QoE modifiziert werden. Es sollen einige QoE Studien implementiert und durchgeführt werden, die die fundamentale Wahrnehmung von Webbrowsing und Videostreaming vergleichen und im Detail untersuchen. Die Ergebnisse der QoE Studien sollen ausgewertet werden.
@mastersthesis{info3-bachelor-2021-2, abstract = {Contact/Kontakt: michael.seufert@uni-wuerzburg.de — Abstract: In this thesis, an existing framework for subjective QoE studies shall be modified. Several QoE study shall be implemented and conducted, which compare and investigate in detail the fundamental perception of web browsing and video streaming. The results of the QoE studies shall be evaluated. — In dieser Arbeit soll ein existierendes Framework für subjektive Befragungen zur QoE modifiziert werden. Es sollen einige QoE Studien implementiert und durchgeführt werden, die die fundamentale Wahrnehmung von Webbrowsing und Videostreaming vergleichen und im Detail untersuchen. Die Ergebnisse der QoE Studien sollen ausgewertet werden.}, author = {Supervisor: Seufert, Michael}, keywords = {myown}, school = {University of Würzburg}, title = {Comparison of Web and Video QoE Perception}, year = 2021 }
74.
Supervisor: Wehner, N.: QoE Monitoring using State-of-the-Art NLP Techniques, (2021).
[ Abstract ] [ BibTeX ]
 
Contact: nikolas.wehner@uni-wuerzburg.de In recent years, the Natural Language Processing (NLP) domain has been transformed severely by novel learning mechanisms like attention and novel Deep Learning models like the general Transformer, BERT, and GPT-3. The attention mechanism aligns input sequences with output sequences in a way that the importance of each input element can be estimated for an output element. This limits its applicability not only to NLP, but it could also be a highly interesting concept for the networking domain in general. The novel models like the Transformer make use of attention mechanisms in order to be able to perform for example neural machine translation with high accuracy. In this work, the applicability of the attention mechanism and for example the Transformer model shall be evaluated for the use case of (Web/Video) QoE monitoring. For this work, the data will be provided. The main task is the modelling of the network traces and the optimization of the learning processes. Therefore, various approaches for the modelling and for the feature extraction shall be tested. (Also available as Bachelor's thesis or Praktikum)
@mastersthesis{info3-master-2020-11, abstract = {Contact: nikolas.wehner@uni-wuerzburg.de In recent years, the Natural Language Processing (NLP) domain has been transformed severely by novel learning mechanisms like attention and novel Deep Learning models like the general Transformer, BERT, and GPT-3. The attention mechanism aligns input sequences with output sequences in a way that the importance of each input element can be estimated for an output element. This limits its applicability not only to NLP, but it could also be a highly interesting concept for the networking domain in general. The novel models like the Transformer make use of attention mechanisms in order to be able to perform for example neural machine translation with high accuracy. In this work, the applicability of the attention mechanism and for example the Transformer model shall be evaluated for the use case of (Web/Video) QoE monitoring. For this work, the data will be provided. The main task is the modelling of the network traces and the optimization of the learning processes. Therefore, various approaches for the modelling and for the feature extraction shall be tested. (Also available as Bachelor's thesis or Praktikum)}, author = {Supervisor: Wehner, Nikolas}, keywords = {myown ucn}, school = {University of Würzburg}, title = {QoE Monitoring using State-of-the-Art NLP Techniques}, year = 2021 }

2020 [ nach oben ]

1.
Khelloqi, S.: Data Augmentation for Machine Learning on Network Traffic, (2020).
[ Abstract ] [ BibTeX ]
 
Contact/Kontakt: michael.seufert@uni-wuerzburg.de ### Title: Data Augmentation for Machine Learning on Network Traffic (Deutsche Beschreibung weiter unten) Abstract: Machine learning models need huge amounts of data for the training of models to succeed. One approach to increasing the amount of training data is to take already available data and alter them slightly without changing the label of the data. This so called “data augmentation” is especially popular for image data. For example, an existing image of a bird can be slightly rotated or resized to create a new training example (alteration of available data), which has the same label (bird). In this thesis, similar methods for data augmentation of network traffic shall be developed and implemented. ### Titel: Datenvermehrung für maschinelles Lernen auf Netzverkehr Inhalt: Maschinelles Lernen benötigt sehr große Datenmenge, damit Modelle erfolgreich trainiert werden können. Ein Ansatz um die Menge an Trainingsdaten zu erhöhen ist es, bereits verfügbare Daten zu nehmen und sie leicht zu modifizieren ohne das Label, d.h., die Klasse der Daten, zu verändern. Diese sogenannte Datenvermehrung oder „Data Augmentation“ ist besonders bei Bilddaten beliebt. Zum Beispiel kann ein existierendes Bild eines Vogels leicht gedreht oder skaliert werden, um ein neues Trainingsbeispiel zu erhalten (Veränderung von existierenden Daten), das die selbe Klasse (Vogel) besitzt. In dieser Arbeit sollen ähnliche Methoden für die Datenvermehrung von Netzverkehr entwickelt und implementiert werden.
@mastersthesis{info3-bachelor-2020-9, abstract = {Contact/Kontakt: michael.seufert@uni-wuerzburg.de ### Title: Data Augmentation for Machine Learning on Network Traffic (Deutsche Beschreibung weiter unten) Abstract: Machine learning models need huge amounts of data for the training of models to succeed. One approach to increasing the amount of training data is to take already available data and alter them slightly without changing the label of the data. This so called “data augmentation” is especially popular for image data. For example, an existing image of a bird can be slightly rotated or resized to create a new training example (alteration of available data), which has the same label (bird). In this thesis, similar methods for data augmentation of network traffic shall be developed and implemented. ### Titel: Datenvermehrung für maschinelles Lernen auf Netzverkehr Inhalt: Maschinelles Lernen benötigt sehr große Datenmenge, damit Modelle erfolgreich trainiert werden können. Ein Ansatz um die Menge an Trainingsdaten zu erhöhen ist es, bereits verfügbare Daten zu nehmen und sie leicht zu modifizieren ohne das Label, d.h., die Klasse der Daten, zu verändern. Diese sogenannte Datenvermehrung oder „Data Augmentation“ ist besonders bei Bilddaten beliebt. Zum Beispiel kann ein existierendes Bild eines Vogels leicht gedreht oder skaliert werden, um ein neues Trainingsbeispiel zu erhalten (Veränderung von existierenden Daten), das die selbe Klasse (Vogel) besitzt. In dieser Arbeit sollen ähnliche Methoden für die Datenvermehrung von Netzverkehr entwickelt und implementiert werden.}, author = {Khelloqi, Sanaa}, keywords = {myown ucn}, school = {University of Würzburg}, title = {Data Augmentation for Machine Learning on Network Traffic}, year = 2020 }
2.
Wehner, N.: Scoring High: Analysis and Prediction of Viewer Behavior and Engagement in the Context of 2018 FIFA WC Live Streaming. , Proceedings of the 28th ACM International Conference on Multimedia (MM), Seattle, WA, USA (2020).
[ Abstract ] [ BibTeX ]
 
Large-scale events pose severe challenges to live video streaming service providers, who need to cope with high, peaking viewer numbers and the resulting fluctuating resource demands, keeping high levels of Quality of Experience (QoE) to avoid end-user frustration and churn. In this paper, we analyze a unique dataset consisting of more than a million 2018 FIFA World Cup mobile live streaming sessions, collected at a large national public broadcaster. Different from previous work, we analyze QoE and user engagement as well as their interaction, in dependency to specific soccer match events, which have the potential to trigger flash crowds during a match. Flash crowds are a particular challenge to video service providers, since they cause sudden load peaks and consequently, the likelihood of quality problems. We further exploit the data to model viewer engagement over the course of a soccer match, and show that client counts follow very similar patterns of change across all matches. We believe that the analysis as well as the resulting models are valuable sources of insight for service providers, equipping them with tools for customer-centric resource and capacity management.
@presentation{info3-presentation-2020-4, abstract = {Large-scale events pose severe challenges to live video streaming service providers, who need to cope with high, peaking viewer numbers and the resulting fluctuating resource demands, keeping high levels of Quality of Experience (QoE) to avoid end-user frustration and churn. In this paper, we analyze a unique dataset consisting of more than a million 2018 FIFA World Cup mobile live streaming sessions, collected at a large national public broadcaster. Different from previous work, we analyze QoE and user engagement as well as their interaction, in dependency to specific soccer match events, which have the potential to trigger flash crowds during a match. Flash crowds are a particular challenge to video service providers, since they cause sudden load peaks and consequently, the likelihood of quality problems. We further exploit the data to model viewer engagement over the course of a soccer match, and show that client counts follow very similar patterns of change across all matches. We believe that the analysis as well as the resulting models are valuable sources of insight for service providers, equipping them with tools for customer-centric resource and capacity management.}, address = {Proceedings of the 28th ACM International Conference on Multimedia (MM), Seattle, WA, USA}, author = {Wehner, Nikolas}, keywords = {myown}, month = 10, title = {Scoring High: Analysis and Prediction of Viewer Behavior and Engagement in the Context of 2018 FIFA WC Live Streaming}, year = 2020 }
3.
Fischer, E., Zoller, D., Dallmann, A., Hotho, A.: Integrating Keywords into BERT4Rec for Sequential Recommendation. KI 2020: Advances in Artificial Intelligence. S. 275–282. Springer International Publishing, Cham (2020).
[ Abstract ] [ BibTeX ] [ DOI ]
 
A crucial part of recommender systems is to model the user’s preference based on her previous interactions. Different neural networks (e.g., Recurrent Neural Networks), that predict the next item solely based on the sequence of interactions have been successfully applied to sequential recommendation. Recently, BERT4Rec has been proposed, which adapts the BERT architecture based on the Transformer model and training methods used in the Neural Language Modeling community to this task. However, BERT4Rec still only relies on item identifiers to model the user preference, ignoring other sources of information. Therefore, as a first step to include additional information, we propose KeBERT4Rec, a modification of BERT4Rec, which utilizes keyword descriptions of items. We compare two variants for adding keywords to the model on two datasets, a Movielens dataset and a dataset of an online fashion store. First results show that both versions of our model improves the sequential recommending task compared to BERT4Rec.
@inproceedings{fischer2020integrating, abstract = {A crucial part of recommender systems is to model the user’s preference based on her previous interactions. Different neural networks (e.g., Recurrent Neural Networks), that predict the next item solely based on the sequence of interactions have been successfully applied to sequential recommendation. Recently, BERT4Rec has been proposed, which adapts the BERT architecture based on the Transformer model and training methods used in the Neural Language Modeling community to this task. However, BERT4Rec still only relies on item identifiers to model the user preference, ignoring other sources of information. Therefore, as a first step to include additional information, we propose KeBERT4Rec, a modification of BERT4Rec, which utilizes keyword descriptions of items. We compare two variants for adding keywords to the model on two datasets, a Movielens dataset and a dataset of an online fashion store. First results show that both versions of our model improves the sequential recommending task compared to BERT4Rec.}, address = {Cham}, author = {Fischer, Elisabeth and Zoller, Daniel and Dallmann, Alexander and Hotho, Andreas}, booktitle = {KI 2020: Advances in Artificial Intelligence}, keywords = {2020 bert4rec embedding kebert4rec keyword myown recommendation recommender sequential}, pages = {275-282}, publisher = {Springer International Publishing}, title = {Integrating Keywords into BERT4Rec for Sequential Recommendation}, volume = 12325, year = 2020 }
4.
Münster, S., Maiwald, F., Lehmann, C., Lazariv, T., Hofmann, M., Niebling, F.: An Automated Pipeline for a Browser-Based, City-Scale Mobile 4D VR Application Based on Historical Images. Proceedings of the 2nd Workshop on Structuring and Understanding of Multimedia HeritAge Contents. S. 33–40. Association for Computing Machinery, Seattle, WA, USA (2020).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
The process for automatically creating 3D city models from contemporary photographs and visualizing them on mobile devices is now well established, but historical 4D city models are more challenging. The fourth dimension here is time. This article describes an automated VR pipeline based on historical photographs and resulting in an interactive browser-based device-rendered 4D visualization and information system for mobile devices. Since the pipeline shown is currently still under development, initial results for stages of the process will be shown and assessed for accuracy and usability.
@inproceedings{10.1145/3423323.3425748, abstract = {The process for automatically creating 3D city models from contemporary photographs and visualizing them on mobile devices is now well established, but historical 4D city models are more challenging. The fourth dimension here is time. This article describes an automated VR pipeline based on historical photographs and resulting in an interactive browser-based device-rendered 4D visualization and information system for mobile devices. Since the pipeline shown is currently still under development, initial results for stages of the process will be shown and assessed for accuracy and usability.}, address = {New York, NY, USA}, author = {Münster, Sander and Maiwald, Ferdinand and Lehmann, Christoph and Lazariv, Taras and Hofmann, Mathias and Niebling, Florian}, booktitle = {Proceedings of the 2nd Workshop on Structuring and Understanding of Multimedia HeritAge Contents}, keywords = {myown niebling}, pages = {33–40}, publisher = {Association for Computing Machinery}, series = {SUMAC'20}, title = {An Automated Pipeline for a Browser-Based, City-Scale Mobile 4D VR Application Based on Historical Images}, year = 2020 }
5.
Ziebell, P., Stümpfig, J., Eidel, M., Kleih, S.C., Kübler, A., Latoschik, M.E., Halder, S.: Stimulus modality influences session-to-session transfer of training effects in auditory and tactile streaming-based P300 brain–computer interfaces. Scientific Reports. 10, 11873- (2020).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
Despite recent successes, patients suffering from locked-in syndrome (LIS) still struggle to communicate using vision-independent brain–computer interfaces (BCIs). In this study, we compared auditory and tactile BCIs, regarding training effects and cross-stimulus-modality transfer effects, when switching between stimulus modalities. We utilized a streaming-based P300 BCI, which was developed as a low workload approach to prevent potential BCI-inefficiency. We randomly assigned 20 healthy participants to two groups. The participants received three sessions of training either using an auditory BCI or using a tactile BCI. In an additional fourth session, BCI versions were switched to explore possible cross-stimulus-modality transfer effects. Both BCI versions could be operated successfully in the first session by the majority of the participants, with the tactile BCI being experienced as more intuitive. Significant training effects were found mostly in the auditory BCI group and strong evidence for a cross-stimulus-modality transfer occurred for the auditory training group that switched to the tactile version but not vice versa. All participants were able to control at least one BCI version, suggesting that the investigated paradigms are generally feasible and merit further research into their applicability with LIS end-users. Individual preferences regarding stimulus modality should be considered.
@article{ziebell2020stimulus, abstract = {Despite recent successes, patients suffering from locked-in syndrome (LIS) still struggle to communicate using vision-independent brain–computer interfaces (BCIs). In this study, we compared auditory and tactile BCIs, regarding training effects and cross-stimulus-modality transfer effects, when switching between stimulus modalities. We utilized a streaming-based P300 BCI, which was developed as a low workload approach to prevent potential BCI-inefficiency. We randomly assigned 20 healthy participants to two groups. The participants received three sessions of training either using an auditory BCI or using a tactile BCI. In an additional fourth session, BCI versions were switched to explore possible cross-stimulus-modality transfer effects. Both BCI versions could be operated successfully in the first session by the majority of the participants, with the tactile BCI being experienced as more intuitive. Significant training effects were found mostly in the auditory BCI group and strong evidence for a cross-stimulus-modality transfer occurred for the auditory training group that switched to the tactile version but not vice versa. All participants were able to control at least one BCI version, suggesting that the investigated paradigms are generally feasible and merit further research into their applicability with LIS end-users. Individual preferences regarding stimulus modality should be considered.}, author = {Ziebell, P. and Stümpfig, J. and Eidel, M. and Kleih, S. C. and Kübler, A. and Latoschik, M. E. and Halder, S.}, journal = {Scientific Reports}, keywords = {marc myown}, number = 1, pages = {11873–}, title = {Stimulus modality influences session-to-session transfer of training effects in auditory and tactile streaming-based P300 brain–computer interfaces}, volume = 10, year = 2020 }
6.
Wehner, N., Seufert, M., Schüler, J., Wassermann, S., Casas, P., Hoßfeld, T.: Improving Web QoE Monitoring for Encrypted Network Traffic through Time Series Modeling. ACM SIGMETRICS Performance Evaluation Review. (2020).
[ Abstract ] [ BibTeX ]
 
This paper addresses the problem of Quality of Experience (QoE) monitoring for web browsing. In particular, the inference of common Web QoE metrics such as Speed Index (SI) is investigated. Based on a large dataset collected with open web-measurement platforms on different device-types, a unique feature set is designed and used to estimate the RUMSI -- an efficient approximation to SI, with machine-learning based regression and classification approaches. Results indicate that it is possible to estimate the RUMSI accurately, and that in particular, recurrent neural networks are highly suitable for the task, as they capture the network dynamics more precisely.
@article{info3-article-2020-4, abstract = {This paper addresses the problem of Quality of Experience (QoE) monitoring for web browsing. In particular, the inference of common Web QoE metrics such as Speed Index (SI) is investigated. Based on a large dataset collected with open web-measurement platforms on different device-types, a unique feature set is designed and used to estimate the RUMSI – an efficient approximation to SI, with machine-learning based regression and classification approaches. Results indicate that it is possible to estimate the RUMSI accurately, and that in particular, recurrent neural networks are highly suitable for the task, as they capture the network dynamics more precisely.}, author = {Wehner, Nikolas and Seufert, Michael and Schüler, Joshua and Wassermann, Sarah and Casas, Pedro and Hoßfeld, Tobias}, journal = {ACM SIGMETRICS Performance Evaluation Review}, keywords = {myown ucn copy}, title = {Improving Web QoE Monitoring for Encrypted Network Traffic through Time Series Modeling}, year = 2020 }
7.
Wehner, N.: Inferring Web QoE with Machine Learning from Encrypted Network Traffic. , 2nd KuVS Workshop on Machine Learning for Networking, Würzburg, Germany (2020).
[ Abstract ] [ BibTeX ]
 
In this work, the problem of Quality of Experience (QoE) monitoring of web browsing is addressed. In particular, the inference of common Web QoE metrics like RUMSI with machine learning is investigated. Based on a large dataset collected with WebPageTest on three different devices, a unique feature set is used to approximate Web QoE metrics with regression and classification approaches. This work highlights work in progress.
@presentation{info3-presentation-2020-3, abstract = {In this work, the problem of Quality of Experience (QoE) monitoring of web browsing is addressed. In particular, the inference of common Web QoE metrics like RUMSI with machine learning is investigated. Based on a large dataset collected with WebPageTest on three different devices, a unique feature set is used to approximate Web QoE metrics with regression and classification approaches. This work highlights work in progress.}, address = {2nd KuVS Workshop on Machine Learning for Networking, Würzburg, Germany}, author = {Wehner, Nikolas}, keywords = {myown}, month = 10, title = {Inferring Web QoE with Machine Learning from Encrypted Network Traffic}, year = 2020 }
8.
Brefeld, U., Fromont, Élisa, Hotho, A., Knobbe, A.J., Maathuis, M.H., Robardet, C. hrsg.: Machine Learning and Knowledge Discovery in Databases - European Conference, ECML PKDD 2019, Würzburg, Germany, September 16-20, 2019, Proceedings, Part II. Springer (2020).
[ BibTeX ] [ URL ]
 
@proceedings{brefeld2020machine2, booktitle = {ECML/PKDD (2)}, editor = {Brefeld, Ulf and Fromont, Élisa and Hotho, Andreas and Knobbe, Arno J. and Maathuis, Marloes H. and Robardet, Céline}, keywords = {2020 ECMLPKDD myown proceedings}, publisher = {Springer}, series = {Lecture Notes in Computer Science}, title = {Machine Learning and Knowledge Discovery in Databases - European Conference, ECML PKDD 2019, Würzburg, Germany, September 16-20, 2019, Proceedings, Part II}, volume = 11907, year = 2020 }
9.
Wehner, N., Seufert, M., Schüler, J., Wassermann, S., Casas, P., Hoßfeld, T.: Improving Web QoE Monitoring for Encrypted Network Traffic through Time Series Modeling. 2nd Workshop on AI in Networks and Distributed Systems (WAIN). , Milan, Italy (2020).
[ Abstract ] [ BibTeX ]
 
This paper addresses the problem of Quality of Experience (QoE) monitoring for web browsing. In particular, the inference of common Web QoE metrics such as Speed Index (SI) is investigated. Based on a large dataset collected with open web-measurement platforms on different device-types, a unique feature set is designed and used to estimate the RUMSI -- an efficient approximation to SI, with machine-learning based regression and classification approaches. Results indicate that it is possible to estimate the RUMSI accurately, and that in particular, recurrent neural networks are highly suitable for the task, as they capture the network dynamics more precisely.
@inproceedings{info3-inproceedings-2020-12, abstract = {This paper addresses the problem of Quality of Experience (QoE) monitoring for web browsing. In particular, the inference of common Web QoE metrics such as Speed Index (SI) is investigated. Based on a large dataset collected with open web-measurement platforms on different device-types, a unique feature set is designed and used to estimate the RUMSI – an efficient approximation to SI, with machine-learning based regression and classification approaches. Results indicate that it is possible to estimate the RUMSI accurately, and that in particular, recurrent neural networks are highly suitable for the task, as they capture the network dynamics more precisely.}, address = {Milan, Italy}, author = {Wehner, Nikolas and Seufert, Michael and Schüler, Joshua and Wassermann, Sarah and Casas, Pedro and Hoßfeld, Tobias}, booktitle = {2nd Workshop on AI in Networks and Distributed Systems (WAIN)}, keywords = {myown ucn}, month = 11, title = {Improving Web QoE Monitoring for Encrypted Network Traffic through Time Series Modeling}, year = 2020 }
10.
Kindermann, P., Montecchiani, F., Schlipf, L., Schulz, A.: Drawing Subcubic 1-Planar Graphs with Few Bends, Few Slopes, and Large Angles. Journal of Graph Algorithms and Applications. 25, 1–28 (2020).
[ Abstract ] [ BibTeX ] [ DOI ]
 
We show that the 1-planar slope number of 3-connected cubic 1-planar graphs is at most 4 when edges are drawn as polygonal curves with at most one bend per edge. This bound is obtained with drawings whose vertex and crossing resolution is at least pi/4. On the other hand, there is an embedding of a graph that needs 3 slopes when drawn with 1-bend edges. We also show that two slopes always suffice for 1-planar drawings of subcubic 1-planar graphs with at most two bends per edge. This bound is obtained with vertex and crossing resolution pi/2. For straight-line drawings of 1-plane graphs, we present lower bounds for the 1-planar slope number in terms of the number of vertices and of the maximum degree.
@article{kmss-ds1pg-jgaa20, abstract = {We show that the 1-planar slope number of 3-connected cubic 1-planar graphs is at most 4 when edges are drawn as polygonal curves with at most one bend per edge. This bound is obtained with drawings whose vertex and crossing resolution is at least pi/4. On the other hand, there is an embedding of a graph that needs 3 slopes when drawn with 1-bend edges. We also show that two slopes always suffice for 1-planar drawings of subcubic 1-planar graphs with at most two bends per edge. This bound is obtained with vertex and crossing resolution pi/2. For straight-line drawings of 1-plane graphs, we present lower bounds for the 1-planar slope number in terms of the number of vertices and of the maximum degree.}, author = {Kindermann, Philipp and Montecchiani, Fabrizio and Schlipf, Lena and Schulz, André}, journal = {Journal of Graph Algorithms and Applications}, keywords = {myown}, number = 1, pages = {1–28}, title = {Drawing Subcubic 1-Planar Graphs with Few Bends, Few Slopes, and Large Angles}, volume = 25, year = 2020 }
11.
Grigorjew, A., Metzger, F., Hoßfeld, T., Specht, J., Götz, F.-J., Chen, F., Schmitt, J.: Bounded Latency with Bridge-Local Stream Reservation and Strict Priority Queuing. 11th International Conference on Network of the Future (NoF) (2020).
[ Abstract ] [ BibTeX ]
 
Bridge-local latency computation is often regarded with caution, while new shaping mechanisms and timed gates are developed to achieve deterministic guarantees. However, these new concepts require additional hardware support in the forwarding devices, and many of them are based on assumptions of central control and network-wide information being available. This document presents a per-hop latency bound for individual streams in a class-based network that applies the IEEE 802.1Q strict priority transmission selection algorithm. It does not rely on shaping or timed gates and uses the accumulated latency fields during the reservation process to provide upper bounds with bridge-local information. The presented delay bound is proven formally and then evaluated with respect to its accuracy. It shows that deterministic latency with priority queuing is indeed feasible, and it indicates the required information that must be provided during resource reservation, e.g., to protocols developed in IEEE 802.1Qdd.
@inproceedings{info3-inproceedings-2020-17, abstract = {Bridge-local latency computation is often regarded with caution, while new shaping mechanisms and timed gates are developed to achieve deterministic guarantees. However, these new concepts require additional hardware support in the forwarding devices, and many of them are based on assumptions of central control and network-wide information being available. This document presents a per-hop latency bound for individual streams in a class-based network that applies the IEEE 802.1Q strict priority transmission selection algorithm. It does not rely on shaping or timed gates and uses the accumulated latency fields during the reservation process to provide upper bounds with bridge-local information. The presented delay bound is proven formally and then evaluated with respect to its accuracy. It shows that deterministic latency with priority queuing is indeed feasible, and it indicates the required information that must be provided during resource reservation, e.g., to protocols developed in IEEE 802.1Qdd.}, author = {Grigorjew, Alexej and Metzger, Florian and Hoßfeld, Tobias and Specht, Johannes and Götz, Franz-Josef and Chen, Feng and Schmitt, Jürgen}, booktitle = {11th International Conference on Network of the Future (NoF)}, keywords = {myown ats-performance}, month = 11, title = {Bounded Latency with Bridge-Local Stream Reservation and Strict Priority Queuing}, year = 2020 }
12.
Grigorjew, A., Metzger, F., Hoßfeld, T., Specht, J., Götz, F.-J., Chen, F., Schmitt, J.: Poster: Per-Hop Bridge-Local Latency Bounds with Strict Priority Transmission Selection. IFIP Networking Conference (2020).
[ Abstract ] [ BibTeX ]
 
This work presents a proven per-hop latency bound for real-time networks with admission control that does not rely on shaping or timed gates. It can be applied in a distributed control plane using only bridge-local information, making it an ideal candidate for brownfield real-time network installations. A brief comparison with Asynchronous Traffic Shaping (ATS) shows that the achieved network utilization is comparable to that of ATS in some scenarios, while it only lags behind in scenarios with accumulating bursts where re-shaping could actually reduce the interference of the observed streams.
@inproceedings{info3-inproceedings-2020-16, abstract = {This work presents a proven per-hop latency bound for real-time networks with admission control that does not rely on shaping or timed gates. It can be applied in a distributed control plane using only bridge-local information, making it an ideal candidate for brownfield real-time network installations. A brief comparison with Asynchronous Traffic Shaping (ATS) shows that the achieved network utilization is comparable to that of ATS in some scenarios, while it only lags behind in scenarios with accumulating bursts where re-shaping could actually reduce the interference of the observed streams.}, author = {Grigorjew, Alexej and Metzger, Florian and Hoßfeld, Tobias and Specht, Johannes and Götz, Franz-Josef and Chen, Feng and Schmitt, Jürgen}, booktitle = {IFIP Networking Conference}, keywords = {myown ats-performance}, month = 6, title = {Poster: Per-Hop Bridge-Local Latency Bounds with Strict Priority Transmission Selection}, year = 2020 }
13.
Obremski, D., Wienrich, C., Carolus, A.: What the user’s voice tells us about UX - Analysing parameters of the voice as indicators of the User Experience of the usage of intelligent voice assistants. Gehalten auf der (2020).
[ BibTeX ] [ URL ] [ DOI ]
 
@inproceedings{https://doi.org/10.18420/muc2020-ws105-377, author = {Obremski, David and Wienrich, Carolin and Carolus, Astrid}, keywords = {myown obremski}, publisher = {Gesellschaft für Informatik e.V.}, title = {What the user’s voice tells us about UX - Analysing parameters of the voice as indicators of the User Experience of the usage of intelligent voice assistants}, year = 2020 }
14.
Lugrin, B., Ströle, E., Obremski, D., Schwab, F., Lange, B.: What if it speaks like it was from the village? Effects of a Robot speaking in Regional Language Variations on Users’ Evaluations. 29th IEEE International Conference on Robot and Human Interactive Communication (RO-MAN 2020). S. 1315–1320 (2020).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
The present contribution investigates the effects of spoken language varieties, in particular non-standard / regional language compared to standard language (in our study: High German), in social robotics. Based on (media) psychological and sociolinguistic research, we assumed that a robot speaking in regional language (i.e., dialect and regional accent) would be considered less competent compared to the same robot speaking in standard language (H1). Contrarily, we assumed that regional language might enhance perceived social skills and likability of a robot, at least so when taking into account whether and how much the human observers making the evaluations talk in regional language themselves. More precisely, it was assumed that the more the study participants spoke in regional language, the better their ratings of the dialect-speaking robot on social skills and likeability would be (H2). We also investigated whether the robot’s gender (male vs. female voice) would have an effect on the ratings (RQ). H1 received full, H2 limited empirical support by the data, while the robot’s gender (RQ) turned out to be a mostly negligible factor. Based on our results, practical implications for robots speaking in regional language varieties are suggested.
@inproceedings{9223432, abstract = {The present contribution investigates the effects of spoken language varieties, in particular non-standard / regional language compared to standard language (in our study: High German), in social robotics. Based on (media) psychological and sociolinguistic research, we assumed that a robot speaking in regional language (i.e., dialect and regional accent) would be considered less competent compared to the same robot speaking in standard language (H1). Contrarily, we assumed that regional language might enhance perceived social skills and likability of a robot, at least so when taking into account whether and how much the human observers making the evaluations talk in regional language themselves. More precisely, it was assumed that the more the study participants spoke in regional language, the better their ratings of the dialect-speaking robot on social skills and likeability would be (H2). We also investigated whether the robot’s gender (male vs. female voice) would have an effect on the ratings (RQ). H1 received full, H2 limited empirical support by the data, while the robot’s gender (RQ) turned out to be a mostly negligible factor. Based on our results, practical implications for robots speaking in regional language varieties are suggested.}, author = {Lugrin, B. and Ströle, E. and Obremski, D. and {Schwab}, F. and {Lange}, B.}, booktitle = {29th IEEE International Conference on Robot and Human Interactive Communication (RO-MAN 2020)}, keywords = {IVA birgit mi myown obremski storyteller}, pages = {1315-1320}, title = {What if it speaks like it was from the village? Effects of a Robot speaking in Regional Language Variations on Users’ Evaluations}, year = 2020 }
15.
Gray, N., Dietz, K., Hoßfeld, T.: Simulative Evaluation of KPIs in SDN for Topology Classification and Performance Prediction Models. 2020 16th International Conference on Network and Service Management (CNSM) (2020).
[ Abstract ] [ BibTeX ]
 
In recent years Software-defined Networking (SDN) has gained increased popularity by reducing the complexity of management operations and increasing the performance of networks. As a result, the number of purchasable SDN devices and their deployment in real world network constantly rises, making a thorough understanding of their behaviors and interactions even more important. In this work we analyze distributed controller architectures via simulation, identify Key Performance Indicators (KPIs), classify various network topologies with respect to their impact on SDN, as well as create a prediction model to estimate the overall performance of the overall SDN ecosystem, which can be used for network planning.
@inproceedings{info3-inproceedings-2020-15, abstract = {In recent years Software-defined Networking (SDN) has gained increased popularity by reducing the complexity of management operations and increasing the performance of networks. As a result, the number of purchasable SDN devices and their deployment in real world network constantly rises, making a thorough understanding of their behaviors and interactions even more important. In this work we analyze distributed controller architectures via simulation, identify Key Performance Indicators (KPIs), classify various network topologies with respect to their impact on SDN, as well as create a prediction model to estimate the overall performance of the overall SDN ecosystem, which can be used for network planning.}, author = {Gray, Nicholas and Dietz, Katharina and Hoßfeld, Tobias}, booktitle = {2020 16th International Conference on Network and Service Management (CNSM)}, keywords = {myown}, title = {Simulative Evaluation of KPIs in SDN for Topology Classification and Performance Prediction Models}, year = 2020 }
16.
Zimmerer, C., Wolf, E., Wolf, S., Fischbach, M., Lugrin, J.-L., Latoschik, M.E.: Finally on Par?! Multimodal and Unimodal Interaction for Open Creative Design Tasks in Virtual Reality. Proceedings of the 2020 International Conference on Multimodal Interaction. S. 222–231. Association for Computing Machinery, Virtual Event, Netherlands (2020).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
Multimodal Interfaces (MMIs) have been considered to provide promising interaction paradigms for Virtual Reality (VR) for some time. However, they are still far less common than unimodal interfaces (UMIs). This paper presents a summative user study comparing an MMI to a typical UMI for a design task in VR. We developed an application targeting creative 3D object manipulations, i.e., creating 3D objects and modifying typical object properties such as color or size. The associated open user task is based on the Torrence Tests of Creative Thinking. We compared a synergistic multimodal interface using speech-accompanied pointing/grabbing gestures with a more typical unimodal interface using a hierarchical radial menu to trigger actions on selected objects. Independent judges rated the creativity of the resulting products using the Consensual Assessment Technique. Additionally, we measured the creativity-promoting factors flow, usability, and presence. Our results show that the MMI performs on par with the UMI in all measurements despite its limited flexibility and reliability. These promising results demonstrate the technological maturity of MMIs and their potential to extend traditional interaction techniques in VR efficiently.
@inproceedings{10.1145/3382507.3418850, abstract = {Multimodal Interfaces (MMIs) have been considered to provide promising interaction paradigms for Virtual Reality (VR) for some time. However, they are still far less common than unimodal interfaces (UMIs). This paper presents a summative user study comparing an MMI to a typical UMI for a design task in VR. We developed an application targeting creative 3D object manipulations, i.e., creating 3D objects and modifying typical object properties such as color or size. The associated open user task is based on the Torrence Tests of Creative Thinking. We compared a synergistic multimodal interface using speech-accompanied pointing/grabbing gestures with a more typical unimodal interface using a hierarchical radial menu to trigger actions on selected objects. Independent judges rated the creativity of the resulting products using the Consensual Assessment Technique. Additionally, we measured the creativity-promoting factors flow, usability, and presence. Our results show that the MMI performs on par with the UMI in all measurements despite its limited flexibility and reliability. These promising results demonstrate the technological maturity of MMIs and their potential to extend traditional interaction techniques in VR efficiently.}, address = {New York, NY, USA}, author = {Zimmerer, Chris and Wolf, Erik and Wolf, Sara and Fischbach, Martin and Lugrin, Jean-Luc and Latoschik, Marc Erich}, booktitle = {Proceedings of the 2020 International Conference on Multimodal Interaction}, keywords = {ewolf mmi myown}, note = {Best Paper Nominee 🏆}, pages = {222–231}, publisher = {Association for Computing Machinery}, series = {ICMI '20}, title = {Finally on Par?! Multimodal and Unimodal Interaction for Open Creative Design Tasks in Virtual Reality}, year = 2020 }
17.
Schlör, D., Ring, M., Hotho, A.: iNALU: Improved Neural Arithmetic Logic Unit. Frontiers in Artificial Intelligence. 3, 71 (2020).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
Neural networks have to capture mathematical relationships in order to learn various tasks. They approximate these relations implicitly and therefore often do not generalize well. The recently proposed Neural Arithmetic Logic Unit (NALU) is a novel neural architecture which is able to explicitly represent the mathematical relationships by the units of the network to learn operations such as summation, subtraction or multiplication. Although NALUs have been shown to perform well on various downstream tasks, an in-depth analysis reveals practical shortcomings by design, such as the inability to multiply or divide negative input values or training stability issues for deeper networks. We address these issues and propose an improved model architecture. We evaluate our model empirically in various settings from learning basic arithmetic operations to more complex functions. Our experiments indicate that our model solves stability issues and outperforms the original NALU model in means of arithmetic precision and convergence.
@article{schlor2020inalu, abstract = {Neural networks have to capture mathematical relationships in order to learn various tasks. They approximate these relations implicitly and therefore often do not generalize well. The recently proposed Neural Arithmetic Logic Unit (NALU) is a novel neural architecture which is able to explicitly represent the mathematical relationships by the units of the network to learn operations such as summation, subtraction or multiplication. Although NALUs have been shown to perform well on various downstream tasks, an in-depth analysis reveals practical shortcomings by design, such as the inability to multiply or divide negative input values or training stability issues for deeper networks. We address these issues and propose an improved model architecture. We evaluate our model empirically in various settings from learning basic arithmetic operations to more complex functions. Our experiments indicate that our model solves stability issues and outperforms the original NALU model in means of arithmetic precision and convergence.}, author = {Schlör, Daniel and Ring, Markus and Hotho, Andreas}, journal = {Frontiers in Artificial Intelligence}, keywords = {2020 arithmetic inalu myown networks neural selected}, pages = 71, title = {iNALU: Improved Neural Arithmetic Logic Unit}, volume = 3, year = 2020 }
18.
Chaplick, S., Kindermann, P., Löffler, A., Thiele, F., Wolff, A., Zaft, A., Zink, J.: Recognizing Stick Graphs with and without Length Constraints. Journal of Graph Algorithms and Applications. 24, 657–681 (2020).
[ BibTeX ] [ DOI ]
 
@article{ckltwzz-rsglc-jgaa20, author = {Chaplick, Steven and Kindermann, Philipp and L{{ö}}ffler, Andre and Thiele, Florian and Wolff, Alexander and Zaft, Alexander and Zink, Johannes}, journal = {Journal of Graph Algorithms and Applications}, keywords = {myown}, note = {Special Issue on Selected Papers from GD 2020}, number = 4, pages = {657–681}, title = {Recognizing Stick Graphs with and without Length Constraints}, volume = 24, year = 2020 }
19.
Zimmerer, C., Heinrich, R., Fischbach, M., Lugrin, J.-L., Latoschik, M.E.: Computing Object Selection Difficulty in VR Using Run-Time Contextual Analysis. 26th ACM Symposium on Virtual Reality Software and Technology. Association for Computing Machinery, Virtual Event, Canada (2020).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
This paper introduces a method for computing the difficulty of selection tasks in virtual environments using pointing metaphors by operationalizing an established human motor behavior model. In contrast to previous work, the difficulty is calculated automatically at run-time for arbitrary environments. We present and provide the implementation of our method within Unity 3D. The difficulty is computed based on a contextual analysis of spatial boundary conditions, i.e., target object size and shape, distance to the user, and occlusion. We believe our method will enable developers to build adaptive systems that automatically equip the user with the most appropriate selection technique according to the context. Further, it provides a standard metric to better evaluate and compare different selection techniques.
@inproceedings{10.1145/3385956.3422089, abstract = {This paper introduces a method for computing the difficulty of selection tasks in virtual environments using pointing metaphors by operationalizing an established human motor behavior model. In contrast to previous work, the difficulty is calculated automatically at run-time for arbitrary environments. We present and provide the implementation of our method within Unity 3D. The difficulty is computed based on a contextual analysis of spatial boundary conditions, i.e., target object size and shape, distance to the user, and occlusion. We believe our method will enable developers to build adaptive systems that automatically equip the user with the most appropriate selection technique according to the context. Further, it provides a standard metric to better evaluate and compare different selection techniques.}, address = {New York, NY, USA}, author = {Zimmerer, Chris and Heinrich, Ronja and Fischbach, Martin and Lugrin, Jean-Luc and Latoschik, Marc Erich}, booktitle = {26th ACM Symposium on Virtual Reality Software and Technology}, keywords = {myown}, note = {Best Poster Award 🏆}, publisher = {Association for Computing Machinery}, series = {VRST '20}, title = {Computing Object Selection Difficulty in VR Using Run-Time Contextual Analysis}, year = 2020 }
20.
Brefeld, U., Fromont, Élisa, Hotho, A., Knobbe, A.J., Maathuis, M.H., Robardet, C. hrsg.: Machine Learning and Knowledge Discovery in Databases - European Conference, ECML PKDD 2019, Würzburg, Germany, September 16-20, 2019, Proceedings, Part I. Springer (2020).
[ BibTeX ] [ URL ]
 
@proceedings{brefeld2020machine3, booktitle = {ECML/PKDD (1)}, editor = {Brefeld, Ulf and Fromont, Élisa and Hotho, Andreas and Knobbe, Arno J. and Maathuis, Marloes H. and Robardet, Céline}, keywords = {2020 ECMLPKDD myown proceedings}, publisher = {Springer}, series = {Lecture Notes in Computer Science}, title = {Machine Learning and Knowledge Discovery in Databases - European Conference, ECML PKDD 2019, Würzburg, Germany, September 16-20, 2019, Proceedings, Part I}, volume = 11906, year = 2020 }
21.
Wodarczyk, S., Mammen, textbfSebastian von: Emergent Multiplayer Games. IEEE CoG ’20: Proceedings of the 2nd International Conference on Games. S. 33–40. IEEE, Osaka, Japan (2020).
[ BibTeX ] [ DOI ]
 
@inproceedings{Wodarczyk:2020aa, address = {Osaka, Japan}, author = {Wodarczyk, Sebastian and \textbf{Sebastian {von Mammen}}}, booktitle = {IEEE CoG '20: Proceedings of the 2nd International Conference on Games}, keywords = {myown}, organization = {IEEE}, pages = {33-40}, publisher = {IEEE}, title = {Emergent Multiplayer Games}, year = 2020 }
22.
Truman, S., Mammen, textbfSebastian von: An Integrated Design of World-in-Miniature Navigation in Virtual Reality. FDG ’20: Proceedings of the 15th International Conference on the Foundations of Digital Games. S. 1–9. ACM, Bugibba, Malta (2020).
[ Abstract ] [ BibTeX ] [ DOI ]
 
Navigation is considered one of the most fundamental challenges in Virtual Reality (VR) and has been extensively researched [11]. The world-in-miniature (WIM) navigation metaphor allows users to travel in large-scale virtual environments (VEs) regardless of available physical space while maintaining a high-level overview of the VE. It relies on a hand-held, scaled-down duplicate of the entire VE, where the user’s current position is displayed, and an interface provided to introduce his/her next movements [17]. There are several extensions to deal with challenges of this navigation technique, e.g. scaling and scrolling [23]. In this work, a WIM is presented that integrates state-of-the-art research insights and incorporates additional features that became apparent during the integration process. These features are needed to improve user interactions and to provide both look-ahead and post-travel feedback. For instance, a novel occlusion handling feature hides the WIM geometry in a rounded space reaching from the user’s hand to his/her forearm. This allows the user to interact with occluded areas of the WIM such as buildings. Further extensions include different visualizations for occlusion handling, an interactive preview screen, post-travel feedback, automatic WIM customization, a unified diegetic UI design concerning WIM and user representation, and an adaptation of widely established gestures to control scaling and scrolling of the WIM. Overall, the presented WIM design integrates and extends state-of-the-art interaction tasks and visualization concepts to overcome open conceptual gaps and to provide a comprehensive practical solution for traveling in VR.
@inproceedings{Truman:2020aa, abstract = {Navigation is considered one of the most fundamental challenges in Virtual Reality (VR) and has been extensively researched [11]. The world-in-miniature (WIM) navigation metaphor allows users to travel in large-scale virtual environments (VEs) regardless of available physical space while maintaining a high-level overview of the VE. It relies on a hand-held, scaled-down duplicate of the entire VE, where the user’s current position is displayed, and an interface provided to introduce his/her next movements [17]. There are several extensions to deal with challenges of this navigation technique, e.g. scaling and scrolling [23]. In this work, a WIM is presented that integrates state-of-the-art research insights and incorporates additional features that became apparent during the integration process. These features are needed to improve user interactions and to provide both look-ahead and post-travel feedback. For instance, a novel occlusion handling feature hides the WIM geometry in a rounded space reaching from the user’s hand to his/her forearm. This allows the user to interact with occluded areas of the WIM such as buildings. Further extensions include different visualizations for occlusion handling, an interactive preview screen, post-travel feedback, automatic WIM customization, a unified diegetic UI design concerning WIM and user representation, and an adaptation of widely established gestures to control scaling and scrolling of the WIM. Overall, the presented WIM design integrates and extends state-of-the-art interaction tasks and visualization concepts to overcome open conceptual gaps and to provide a comprehensive practical solution for traveling in VR.}, address = {Bugibba, Malta}, author = {Truman, Samuel and \textbf{Sebastian {von Mammen}}}, booktitle = {FDG '20: Proceedings of the 15th International Conference on the Foundations of Digital Games}, keywords = {myown}, organization = {IEEE}, pages = {1–9}, publisher = {ACM}, title = {An Integrated Design of World-in-Miniature Navigation in Virtual Reality}, year = 2020 }
23.
Stauffert, J.-P., Niebling, F., Latoschik, M.E.: Latency and Cybersickness: Impact, Causes, and Measures. A Review. Frontiers in Virtual Reality. 1, 31 (2020).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
Latency is a key characteristic inherent to any computer system. Motion-to-Photon (MTP) latency describes the time between the movement of a tracked object and its corresponding movement rendered and depicted by computer-generated images on a graphical output screen. High MTP latency can cause a loss of performance in interactive graphics applications and, even worse, can provoke cybersickness in Virtual Reality (VR) applications. Here, cybersickness can degrade VR experiences or may render the experiences completely unusable. It can confound research findings of an otherwise sound experiment. Latency as a contributing factor to cybersickness needs to be properly understood. Its effects need to be analyzed, its sources need to be identified, good measurement methods need to be developed, and proper counter measures need to be developed in order to reduce potentially harmful impacts of latency on the usability and safety of VR systems. Research shows that latency can exhibit intricate timing patterns with various spiking and periodic behavior. These timing behaviors may vary, yet most are found to provoke cybersickness. Overall, latency can differ drastically between different systems interfering with generalization of measurement results. This review article describes the causes and effects of latency with regard to cybersickness. We report on different existing approaches to measure and report latency. Hence, the article provides readers with the knowledge to understand and report latency for their own applications, evaluations, and experiments. It should also help to measure, identify, and finally control and counteract latency and hence gain confidence into the soundness of empirical data collected by VR exposures. Low latency increases the usability and safety of VR systems.
@article{stauffert:2020b, abstract = {Latency is a key characteristic inherent to any computer system. Motion-to-Photon (MTP) latency describes the time between the movement of a tracked object and its corresponding movement rendered and depicted by computer-generated images on a graphical output screen. High MTP latency can cause a loss of performance in interactive graphics applications and, even worse, can provoke cybersickness in Virtual Reality (VR) applications. Here, cybersickness can degrade VR experiences or may render the experiences completely unusable. It can confound research findings of an otherwise sound experiment. Latency as a contributing factor to cybersickness needs to be properly understood. Its effects need to be analyzed, its sources need to be identified, good measurement methods need to be developed, and proper counter measures need to be developed in order to reduce potentially harmful impacts of latency on the usability and safety of VR systems. Research shows that latency can exhibit intricate timing patterns with various spiking and periodic behavior. These timing behaviors may vary, yet most are found to provoke cybersickness. Overall, latency can differ drastically between different systems interfering with generalization of measurement results. This review article describes the causes and effects of latency with regard to cybersickness. We report on different existing approaches to measure and report latency. Hence, the article provides readers with the knowledge to understand and report latency for their own applications, evaluations, and experiments. It should also help to measure, identify, and finally control and counteract latency and hence gain confidence into the soundness of empirical data collected by VR exposures. Low latency increases the usability and safety of VR systems.}, author = {Stauffert, Jan-Philipp and Niebling, Florian and Latoschik, Marc Erich}, journal = {Frontiers in Virtual Reality}, keywords = {myown}, pages = 31, title = {Latency and Cybersickness: Impact, Causes, and Measures. A Review}, volume = 1, year = 2020 }
24.
Büttner, J., Merz, C., von Mammen, S.: Horde Battle III or How to Dismantle a Swarm. 2020 IEEE Conference on Games (CoG). S. 640–641. IEEE, Osaka, Japan (2020).
[ Abstract ] [ BibTeX ] [ DOI ]
 
In this demo paper, we present the design of a virtual reality (VR) first-person shooter (FPS) in which the player fends off waves of hostile flying swarm robots that took over the Earth. The purpose of this serious game is to train the player in understanding networks by learning how to dismantle them. We explain the play and game mechanics and the level designs tailored to provide an engaging experience and to re-enforce the network perspective of the swarm dynamics.
@inproceedings{9231746, abstract = {In this demo paper, we present the design of a virtual reality (VR) first-person shooter (FPS) in which the player fends off waves of hostile flying swarm robots that took over the Earth. The purpose of this serious game is to train the player in understanding networks by learning how to dismantle them. We explain the play and game mechanics and the level designs tailored to provide an engaging experience and to re-enforce the network perspective of the swarm dynamics.}, address = {Osaka, Japan}, author = {{Büttner}, Johannes and {Merz}, Christian and {von Mammen}, Sebastian}, booktitle = {2020 IEEE Conference on Games (CoG)}, keywords = {myown}, pages = {640-641}, publisher = {IEEE}, title = {Horde Battle III or How to Dismantle a Swarm}, year = 2020 }
25.
Vetter, A., Götz, D., von Mammen, S.: The Art of Loci: Immerse to Memorize. 2020 IEEE Conference on Games (CoG). S. 642–645. IEEE, Osaka, Japan (2020).
[ Abstract ] [ BibTeX ] [ DOI ]
 
There are uncountable things to be remembered, but most people were never shown how to memorize effectively. With this paper, the application The Art of Loci (TAoL) is presented, to provide the means for efficient and fun learning. In a virtual reality (VR) environment users can express their study material visually, either creating dimensional mind maps or experimenting with mnemonic strategies, such as mind palaces. We also present common memorization techniques in light of their underlying pedagogical foundations and discuss the respective features of TAoL in comparison with similar software applications.
@inproceedings{9231610, abstract = {There are uncountable things to be remembered, but most people were never shown how to memorize effectively. With this paper, the application The Art of Loci (TAoL) is presented, to provide the means for efficient and fun learning. In a virtual reality (VR) environment users can express their study material visually, either creating dimensional mind maps or experimenting with mnemonic strategies, such as mind palaces. We also present common memorization techniques in light of their underlying pedagogical foundations and discuss the respective features of TAoL in comparison with similar software applications.}, address = {Osaka, Japan}, author = {{Vetter}, Anne and {Götz}, Daniel and {von Mammen}, Sebastian}, booktitle = {2020 IEEE Conference on Games (CoG)}, keywords = {myown}, month = {August}, pages = {642-645}, publisher = {IEEE}, title = {The Art of Loci: Immerse to Memorize}, year = 2020 }
26.
Omeliyanenko, J., Zehe, A., Hettinger, L., Hotho, A.: LM4KG: Improving Common Sense Knowledge Graphs with Language Models. In: Pan, J.Z., Tamma, V., d’Amato, C., Janowicz, K., Fu, B., Polleres, A., Seneviratne, O., und Kagal, L. (hrsg.) The Semantic Web -- ISWC 2020. S. 456–473. Springer International Publishing, Cham (2020).
[ Abstract ] [ BibTeX ] [ URL ]
 
Language Models (LMs) and Knowledge Graphs (KGs) are both active research areas in Machine Learning and Semantic Web. While LMs have brought great improvements for many downstream tasks on their own, they are often combined with KGs providing additionally aggregated, well structured knowledge. Usually, this is done by leveraging KGs to improve LMs. But what happens if we turn this around and use LMs to improve KGs?
@inproceedings{omeliyanenko2020lm4kg, abstract = {Language Models (LMs) and Knowledge Graphs (KGs) are both active research areas in Machine Learning and Semantic Web. While LMs have brought great improvements for many downstream tasks on their own, they are often combined with KGs providing additionally aggregated, well structured knowledge. Usually, this is done by leveraging KGs to improve LMs. But what happens if we turn this around and use LMs to improve KGs?}, address = {Cham}, author = {Omeliyanenko, Janna and Zehe, Albin and Hettinger, Lena and Hotho, Andreas}, booktitle = {The Semantic Web – ISWC 2020}, editor = {Pan, Jeff Z. and Tamma, Valentina and d'Amato, Claudia and Janowicz, Krzysztof and Fu, Bo and Polleres, Axel and Seneviratne, Oshani and Kagal, Lalana}, keywords = {2020 graph kg knowledge language lm model myown nlp semantic}, pages = {456–473}, publisher = {Springer International Publishing}, title = {LM4KG: Improving Common Sense Knowledge Graphs with Language Models}, year = 2020 }
27.
Glémarec, Y., Lugrin, J.-L., Bosser, A.-G., Cagniat, P., Buche, C., Latoschik, M.E.: Pushing Out the Classroom Walls: A Scalability Benchmark for a Virtual Audience Behaviour Model in Virtual Reality. (2020).
[ BibTeX ] [ URL ] [ DOI ]
 
@article{https://doi.org/10.18420/muc2020-ws134-337, author = {Glémarec, Yann and Lugrin, Jean-Luc and Bosser, Anne-Gwenn and Cagniat, Paul and Buche, Cédric and Latoschik, Marc Erich}, keywords = {myown vtimes}, publisher = {Gesellschaft für Informatik e.V.}, title = {Pushing Out the Classroom Walls: A Scalability Benchmark for a Virtual Audience Behaviour Model in Virtual Reality}, year = 2020 }
28.
Firman, O., Felsner, S., Kindermann, P., Ravsky, A., Wolff, A., Zink, J.: The Complexity of Finding Tangles. In: Chaplick, S., Kindermann, P., und Wolff, A. (hrsg.) Proceedings of the 36th European Workshop on Computational Geometry (EuroCG’20). S. 67:1–67:8. Würzburg (2020).
[ Abstract ] [ BibTeX ] [ URL ]
 
We study the following combinatorial problem. Given a set of n y-monotone curves, which we call wires, a tangle determines the order of the wires on a number of horizontal layers such that the orders of the wires on any two consecutive layers differ only in swaps of neighboring wires. Given a multiset L of swaps (that is, unordered pairs of wires) and an initial order of the wires, a tangle realizes L if each pair of wires changes its order exactly as many times as specified by L. Finding a tangle that realizes a given multiset of swaps and uses the least number of layers is known to be NP-hard. We show that it is even NP-hard to decide if a realizing tangle exists.
@inproceedings{ffkrwz-tcft-eurocg20, abstract = {We study the following combinatorial problem. Given a set of n y-monotone curves, which we call wires, a tangle determines the order of the wires on a number of horizontal layers such that the orders of the wires on any two consecutive layers differ only in swaps of neighboring wires. Given a multiset L of swaps (that is, unordered pairs of wires) and an initial order of the wires, a tangle realizes L if each pair of wires changes its order exactly as many times as specified by L. Finding a tangle that realizes a given multiset of swaps and uses the least number of layers is known to be NP-hard. We show that it is even NP-hard to decide if a realizing tangle exists.}, author = {Firman, Oksana and Felsner, Stefan and Kindermann, Philipp and Ravsky, Alexander and Wolff, Alexander and Zink, Johannes}, booktitle = {Proceedings of the 36th European Workshop on Computational Geometry (EuroCG'20)}, editor = {Chaplick, Steven and Kindermann, Philipp and Wolff, Alexander}, keywords = {myown}, note = {Abstract}, pages = {67:1–67:8}, publisher = {Würzburg}, title = {The Complexity of Finding Tangles}, year = 2020 }
29.
Dietz, K.: Identification and Evaluation of KPIs in SDN via Simulation for Establishing Topology Classifications and Prediction Models, (2020).
[ BibTeX ]
 
@mastersthesis{info3-master-2020-14, author = {Dietz, Katharina}, keywords = {myown}, month = 1, school = {University of Würzburg}, title = {Identification and Evaluation of KPIs in SDN via Simulation for Establishing Topology Classifications and Prediction Models}, year = 2020 }
30.
Seufert, M., Wehner, N., Wieser, V., Casas, P., Capdehourat, G.: Mind the (QoE) Gap: On the Incompatibility of Web and Video QoE Models in the Wild. 16th International Conference on Network and Service Management (CNSM). , Izmir, Turkey (2020).
[ Abstract ] [ BibTeX ]
 
Education Service Providers (ESPs) have a paramount role in the digitization of education, providing reliable devices for students and teachers and high quality Internet access at schools. In this paper, a large-scale, passive, in-device Quality of Experience (QoE) monitoring system is presented, which was deployed into a nationwide network of education-purpose devices. Four months' worth of continuous measurements were conducted by an ESP, covering more than 800 education centers and about 4000 devices, used both in schools and at home. When analyzing the QoE of web sessions in school networks, we identify a fundamental issue with the compatibility of web browsing and video QoE models, which inhibits the successful application of QoE-aware network management for multiple services.
@inproceedings{info3-inproceedings-2020-11, abstract = {Education Service Providers (ESPs) have a paramount role in the digitization of education, providing reliable devices for students and teachers and high quality Internet access at schools. In this paper, a large-scale, passive, in-device Quality of Experience (QoE) monitoring system is presented, which was deployed into a nationwide network of education-purpose devices. Four months' worth of continuous measurements were conducted by an ESP, covering more than 800 education centers and about 4000 devices, used both in schools and at home. When analyzing the QoE of web sessions in school networks, we identify a fundamental issue with the compatibility of web browsing and video QoE models, which inhibits the successful application of QoE-aware network management for multiple services.}, address = {Izmir, Turkey}, author = {Seufert, Michael and Wehner, Nikolas and Wieser, Viktoria and Casas, Pedro and Capdehourat, Germán}, booktitle = {16th International Conference on Network and Service Management (CNSM)}, keywords = {myown ucn}, month = 11, title = {Mind the (QoE) Gap: On the Incompatibility of Web and Video QoE Models in the Wild}, year = 2020 }
31.
Stulier, N.: Characterisation of the APM in videogames using DOTA 2, (2020).
[ BibTeX ]
 
@mastersthesis{info3-master-2020-12, author = {Stulier, Norman}, keywords = {myown}, month = 11, school = {University of Würzburg}, title = {Characterisation of the APM in videogames using DOTA 2}, year = 2020 }
32.
Firman, O., Felsner, S., Kindermann, P., Ravsky, A., Wolff, A., Zink, J.: The Complexity of Finding Tangles. In: Auber, D. und Valtr, P. (hrsg.) Proceedings of the 28th International Symposium on Graph Drawing and Network Visualization (GD’20) (2020).
[ Abstract ] [ BibTeX ]
 
We study the following combinatorial problem. Given a set of n y-monotone curves, which we call wires, a tangle determines the order of the wires on a number of horizontal layers such that the orders of the wires on any two consecutive layers differ only in swaps of neighboring wires. Given a multiset L of swaps (that is, unordered pairs of wires) and an initial order of the wires, a tangle realizes L if each pair of wires changes its order exactly as many times as specified by L. Finding a tangle that realizes a given multiset of swaps and uses the least number of layers is known to be NP-hard. We show that it is even NP-hard to decide if a realizing tangle exists.
@inproceedings{ffkrwz-tcft-gd20poster, abstract = {We study the following combinatorial problem. Given a set of n y-monotone curves, which we call wires, a tangle determines the order of the wires on a number of horizontal layers such that the orders of the wires on any two consecutive layers differ only in swaps of neighboring wires. Given a multiset L of swaps (that is, unordered pairs of wires) and an initial order of the wires, a tangle realizes L if each pair of wires changes its order exactly as many times as specified by L. Finding a tangle that realizes a given multiset of swaps and uses the least number of layers is known to be NP-hard. We show that it is even NP-hard to decide if a realizing tangle exists.}, author = {Firman, Oksana and Felsner, Stefan and Kindermann, Philipp and Ravsky, Alexander and Wolff, Alexander and Zink, Johannes}, booktitle = {Proceedings of the 28th International Symposium on Graph Drawing and Network Visualization (GD'20)}, editor = {Auber, David and Valtr, Pavel}, keywords = {myown}, note = {Poster. To appear}, title = {The Complexity of Finding Tangles}, year = 2020 }
33.
Angelini, P., Bekos, M., Kindermann, P., Mchedlidze, T.: On Mixed Linear Layouts of Series-Parallel Graphs. In: Auber, D. und Valtr, P. (hrsg.) Proceedings of the 28th International Symposium on Graph Drawing and Network Visualization (GD’20) (2020).
[ Abstract ] [ BibTeX ]
 
A mixed s-stack q-queue layout of a graph consists of a linear ordering of its vertices and of a partition of its edges into s stacks and q queues, such that no two edges in the same stack cross and no two edges in the same queue nest. In 1992, Heath and Rosenberg conjectured that every planar graph admits a mixed 1-stack 1-queue layout. Recently, Pupyrev disproved this conjectured by demonstrating a planar partial 3-tree that does not admit a 1-stack 1-queue layout. In this note, we strengthen Pupyrev's result by showing that the conjecture does not hold even for 2-trees.
@inproceedings{abkm-mllsp-gd20, abstract = {A mixed s-stack q-queue layout of a graph consists of a linear ordering of its vertices and of a partition of its edges into s stacks and q queues, such that no two edges in the same stack cross and no two edges in the same queue nest. In 1992, Heath and Rosenberg conjectured that every planar graph admits a mixed 1-stack 1-queue layout. Recently, Pupyrev disproved this conjectured by demonstrating a planar partial 3-tree that does not admit a 1-stack 1-queue layout. In this note, we strengthen Pupyrev's result by showing that the conjecture does not hold even for 2-trees.}, author = {Angelini, Patrizio and Bekos, Michael and Kindermann, Philipp and Mchedlidze, Tamara}, booktitle = {Proceedings of the 28th International Symposium on Graph Drawing and Network Visualization (GD'20)}, editor = {Auber, David and Valtr, Pavel}, keywords = {myown}, note = {To appear}, title = {On Mixed Linear Layouts of Series-Parallel Graphs}, year = 2020 }
34.
Angelini, P., Kindermann, P., Löffler, A., Schlipf, L., Symvonis, A.: One-Bend Drawings of Outerplanar Graphs Inside Simple Polygons. In: Chaplick, S., Kindermann, P., und Wolff, A. (hrsg.) Proceedings of the 36th European Workshop on Computational Geometry (EuroCG’20). S. 70:1–70:6. Würzburg (2020).
[ Abstract ] [ BibTeX ] [ URL ]
 
We consider the problem of drawing an outerplanar graph with n vertices with at most one bend per edge if the outer face is already drawn as a simple polygon with m corners. We prove that it can be decided in O(mn) time if such a drawing exists. In the positive case, our algorithm also outputs such a drawing.
@inproceedings{aklss-obdog-eurocg20, abstract = {We consider the problem of drawing an outerplanar graph with n vertices with at most one bend per edge if the outer face is already drawn as a simple polygon with m corners. We prove that it can be decided in O(mn) time if such a drawing exists. In the positive case, our algorithm also outputs such a drawing.}, author = {Angelini, Patrizio and Kindermann, Philipp and Löffler, Andre and Schlipf, Lena and Symvonis, Antonios}, booktitle = {Proceedings of the 36th European Workshop on Computational Geometry (EuroCG'20)}, editor = {Chaplick, Steven and Kindermann, Philipp and Wolff, Alexander}, keywords = {myown}, note = {Abstract}, pages = {70:1–70:6}, publisher = {Würzburg}, title = {One-Bend Drawings of Outerplanar Graphs Inside Simple Polygons}, year = 2020 }
35.
Kindermann, P., Mchedlidze, T., Meulemans, W., Rutter, I.: Graph Drawing Contest Report. In: Auber, D. und Valtr, P. (hrsg.) Proc. 28th International Symposium on Graph Drawing and Network Visualization (GD’20) (2020).
[ BibTeX ] [ URL ]
 
@inproceedings{kmmr-gdcr-gd20, author = {Kindermann, Philipp and Mchedlidze, Tamara and Meulemans, Wouter and Rutter, Ignaz}, booktitle = {Proc. 28th International Symposium on Graph Drawing and Network Visualization (GD'20)}, editor = {Auber, David and Valtr, Pavel}, keywords = {contest drawing graph myown}, note = {To appear}, title = {Graph Drawing Contest Report}, year = 2020 }
36.
Schwind, A., Wamser, F., Hoßfeld, T., Wunderer, S., Tarnvik, E., Hall, A.: Crowdsourced Network Measurements in Germany: Mobile Internet Experience from End User Perspective. Broadband Coverage in Germany; 14. ITG Symposium. , Berlin (2020).
[ Abstract ] [ BibTeX ]
 
Collecting and analyzing meaningful data in mobile networks is the key to assessing network performance. Crowdsourced Network Measurements (CNMs) provide insights beyond the network layer and offer performance and other measurements at the application and user-level towards Quality of Experience (QoE). In this paper, the mobile Internet experience for Germany is evaluated with the help of crowdsourcing from the perspective of an end user. We statistically analyze a dataset with throughput measurements on the end device from Tutela Ltd., which covers more than 2.5 million throughput tests across Germany from January to July 2019. We give insights into this emerging methodology and highlight the benefits of this method. The paper contains statistics and conclusions for several large cities as well as regions in Germany compared to general statements for Germany, since individual measurements and averages often only imprecisely reflect the situation. The goal is to give a holistic view of the performance of the current mobile network in Germany. Reading this paper, it becomes evident that reliable statements about the quality of the mobile network for Germany depend on a large number of peculiarities in different regions with their own performance characteristics due to different network deployments and population numbers.
@inproceedings{info3-inproceedings-2020-13, abstract = {Collecting and analyzing meaningful data in mobile networks is the key to assessing network performance. Crowdsourced Network Measurements (CNMs) provide insights beyond the network layer and offer performance and other measurements at the application and user-level towards Quality of Experience (QoE). In this paper, the mobile Internet experience for Germany is evaluated with the help of crowdsourcing from the perspective of an end user. We statistically analyze a dataset with throughput measurements on the end device from Tutela Ltd., which covers more than 2.5 million throughput tests across Germany from January to July 2019. We give insights into this emerging methodology and highlight the benefits of this method. The paper contains statistics and conclusions for several large cities as well as regions in Germany compared to general statements for Germany, since individual measurements and averages often only imprecisely reflect the situation. The goal is to give a holistic view of the performance of the current mobile network in Germany. Reading this paper, it becomes evident that reliable statements about the quality of the mobile network for Germany depend on a large number of peculiarities in different regions with their own performance characteristics due to different network deployments and population numbers.}, address = {Berlin}, author = {Schwind, Anika and Wamser, Florian and Hoßfeld, Tobias and Wunderer, Stefan and Tarnvik, Erik and Hall, Andy}, booktitle = {Broadband Coverage in Germany; 14. ITG Symposium}, keywords = {myown cnm can}, month = 8, title = {Crowdsourced Network Measurements in Germany: Mobile Internet Experience from End User Perspective}, year = 2020 }
37.
Kobs, K., Koopmann, T., Zehe, A., Fernes, D., Krop, P., Hotho, A.: Where to Submit? Helping Researchers to Choose the Right Venue. Findings of the Association for Computational Linguistics: EMNLP 2020. S. 878–883. Association for Computational Linguistics, Online (2020).
[ Abstract ] [ BibTeX ] [ URL ]
 
Whenever researchers write a paper, the same question occurs: ``Where to submit?'' In this work, we introduce WTS, an open and interpretable NLP system that recommends conferences and journals to researchers based on the title, abstract, and/or keywords of a given paper. We adapt the TextCNN architecture and automatically analyze its predictions using the Integrated Gradients method to highlight words and phrases that led to the recommendation of a scientific venue. We train and test our method on publications from the fields of artificial intelligence (AI) and medicine, both derived from the Semantic Scholar dataset. WTS achieves an Accuracy@5 of approximately 83% for AI papers and 95% in the field of medicine. It is open source and available for testing on https://wheretosubmit.ml.
@inproceedings{kobs2020where, abstract = {Whenever researchers write a paper, the same question occurs: {``}Where to submit?{''} In this work, we introduce WTS, an open and interpretable NLP system that recommends conferences and journals to researchers based on the title, abstract, and/or keywords of a given paper. We adapt the TextCNN architecture and automatically analyze its predictions using the Integrated Gradients method to highlight words and phrases that led to the recommendation of a scientific venue. We train and test our method on publications from the fields of artificial intelligence (AI) and medicine, both derived from the Semantic Scholar dataset. WTS achieves an Accuracy@5 of approximately 83{\%} for AI papers and 95{\%} in the field of medicine. It is open source and available for testing on https://wheretosubmit.ml.}, address = {Online}, author = {Kobs, Konstantin and Koopmann, Tobias and Zehe, Albin and Fernes, David and Krop, Philipp and Hotho, Andreas}, booktitle = {Findings of the Association for Computational Linguistics: EMNLP 2020}, keywords = {2020 bert myown nlp paper research venue}, month = {nov}, pages = {878–883}, publisher = {Association for Computational Linguistics}, title = {Where to Submit? Helping Researchers to Choose the Right Venue}, year = 2020 }
38.
Seufert, M.: Different Points of View: Impact of 3D Point Cloud Reduction on QoE of Rendered Images. , 12th International Conference on Quality of Multimedia Experience (QoMEX), Athlone, Ireland (virtual) (2020).
[ BibTeX ]
 
@presentation{info3-presentation-2020-2, address = {12th International Conference on Quality of Multimedia Experience (QoMEX), Athlone, Ireland (virtual)}, author = {Seufert, Michael}, keywords = {myown ucn}, month = 5, title = {Different Points of View: Impact of 3D Point Cloud Reduction on QoE of Rendered Images}, year = 2020 }
39.
Berani, S.: Fingerprinting Websites in Encrypted Network Traffic, (2020).
[ Abstract ] [ BibTeX ]
 
Contact/Kontakt: nikolas.wehner@informatik.uni-wuerzburg.de Auch als Praktikum verfügbar. Due to the encryption of network traffic and the introduction of DNS over HTTPS, the task of identifying websites based on the corresponding network traffic got difficult. Nonetheless, ISPs want to know which kind of traffic passes their networks in order to optimize the QoE of their customers. The goal of this work is to create a model which is able to reliably predict the called websites during a session. Therefore, reasonable features have to be extracted from the data and afterward they have to be ingested into selected Machine Learning algorithms.
@mastersthesis{info3-master-2019-10, abstract = {Contact/Kontakt: nikolas.wehner@informatik.uni-wuerzburg.de Auch als Praktikum verfügbar. Due to the encryption of network traffic and the introduction of DNS over HTTPS, the task of identifying websites based on the corresponding network traffic got difficult. Nonetheless, ISPs want to know which kind of traffic passes their networks in order to optimize the QoE of their customers. The goal of this work is to create a model which is able to reliably predict the called websites during a session. Therefore, reasonable features have to be extracted from the data and afterward they have to be ingested into selected Machine Learning algorithms.}, author = {Berani, Shpend}, keywords = {myown}, school = {University of Würzburg}, title = {Fingerprinting Websites in Encrypted Network Traffic}, year = 2020 }
40.
Mertinat, N.: Impact of Content Selection on Crowdsourced QoE Studies of HTTP Adaptive Streaming on Mobile Devices, (2020).
[ BibTeX ]
 
@mastersthesis{info3-bachelor-2019-5, author = {Mertinat, Nils}, keywords = {myown ucn}, month = 2, school = {University of Würzburg}, title = {Impact of Content Selection on Crowdsourced QoE Studies of HTTP Adaptive Streaming on Mobile Devices}, year = 2020 }
41.
Supervisor: Loh, F.: Studying the Scalability of LoRaWAN with Omnet++, (2020).
[ BibTeX ]
 
@mastersthesis{info3-praktikum-2019-17, author = {Supervisor: Loh, Frank}, keywords = {myown}, school = {University of Würzburg}, title = {Studying the Scalability of LoRaWAN with Omnet++}, year = 2020 }
42.
Gray, N.: Evaluation of the Impact of Network Topologies and Applications on Synchronization Strategies of Distributed SDN Controllers, (2020).
[ Abstract ] [ BibTeX ]
 
Software-defined Networking (SDN) separates the data from the control plane and outsources the latter to a logically centralized instance called the controller. This enables a common view of the network topology and provides a central entity for network configurations. The controller is often distributed to impose no single point of failure and to balance the load efficiently among the physical controller instances. To maintain a consistent view of the network, synchronization between the individual controller instances is required. Controller implementations can be categorized by their utilized synchronization strategy and largely fall in one of two categories, namely horizontal or hierarchical. Goal of this thesis is to evaluate the impact of the network topology and running controller applications on the performance of the controller when using different synchronization mechanisms. As access to large SDN test beds is limited the investigations will be done by simulations within the OMNeT++ framework.
@mastersthesis{info3-bachelor-2017-18, abstract = {Software-defined Networking (SDN) separates the data from the control plane and outsources the latter to a logically centralized instance called the controller. This enables a common view of the network topology and provides a central entity for network configurations. The controller is often distributed to impose no single point of failure and to balance the load efficiently among the physical controller instances. To maintain a consistent view of the network, synchronization between the individual controller instances is required. Controller implementations can be categorized by their utilized synchronization strategy and largely fall in one of two categories, namely horizontal or hierarchical. Goal of this thesis is to evaluate the impact of the network topology and running controller applications on the performance of the controller when using different synchronization mechanisms. As access to large SDN test beds is limited the investigations will be done by simulations within the OMNeT++ framework.}, author = {Gray, Nicholas}, keywords = {myown ngn}, school = {University of Würzburg}, title = {Evaluation of the Impact of Network Topologies and Applications on Synchronization Strategies of Distributed SDN Controllers}, year = 2020 }
43.
Loh, F., Wamser, F., Moldovan, C., Zeidler, B., Tsilimantos, D., Valentin, S., Hoßfeld, T.: Is the Uplink Enough? Estimating Video Stalls from Encrypted Network Traffic. 32th IEEE/IFIP Network Operations and Management Symposium. , Budapest, Hungary (2020).
[ Abstract ] [ BibTeX ]
 
Today’s traffic projections speak of almost 58 % video traffic across the Internet. Nearly all video traffic is encrypted, accounting for more than 50 % encrypted traffic worldwide. To analyze video traffic today, or even estimate its quality in the network, a deep look into the traffic characteristics has to be done. But then, important quality metrics from the traffic behavior can be derived. Based on extensive measurements we show in this work how to measure and estimate video stalls for mobile adaptive streaming. The underlying dataset includes more than 900 hours of video footage from the native YouTube app, measured over 18 different videos in 56 network scenarios in two cities in Europe. We outline a possible approach to estimate the video playback buffer size based on uplink video chunk requests in real-time to break down the video stalls. This work is intended as a tool for network operators to receive further knowledge of the characteristics of video streaming traffic to quantify the most important QoE degradation factors of one of the most important applications today.
@inproceedings{info3-inproceedings-2020-2, abstract = {Today’s traffic projections speak of almost 58 % video traffic across the Internet. Nearly all video traffic is encrypted, accounting for more than 50 % encrypted traffic worldwide. To analyze video traffic today, or even estimate its quality in the network, a deep look into the traffic characteristics has to be done. But then, important quality metrics from the traffic behavior can be derived. Based on extensive measurements we show in this work how to measure and estimate video stalls for mobile adaptive streaming. The underlying dataset includes more than 900 hours of video footage from the native YouTube app, measured over 18 different videos in 56 network scenarios in two cities in Europe. We outline a possible approach to estimate the video playback buffer size based on uplink video chunk requests in real-time to break down the video stalls. This work is intended as a tool for network operators to receive further knowledge of the characteristics of video streaming traffic to quantify the most important QoE degradation factors of one of the most important applications today.}, address = {Budapest, Hungary}, author = {Loh, Frank and Wamser, Florian and Moldovan, Christian and Zeidler, Bernd and Tsilimantos, Dimitrios and Valentin, Stefan and Hoßfeld, Tobias}, booktitle = {32th IEEE/IFIP Network Operations and Management Symposium}, keywords = {myown huawei can}, month = 4, title = {Is the Uplink Enough? Estimating Video Stalls from Encrypted Network Traffic}, year = 2020 }
44.
Moldovan, C., Loh, F., Seufert, M., Hoßfeld, T.: Optimizing HAS for 360-Degree Videos. 5th IEEE/IFIP International Workshop on Analytics for Network and Service Management (AnNet). , Budapest, Hungary (2020).
[ BibTeX ]
 
@inproceedings{info3-inproceedings-2020-1, address = {Budapest, Hungary}, author = {Moldovan, Christian and Loh, Frank and Seufert, Michael and Hoßfeld, Tobias}, booktitle = {5th IEEE/IFIP International Workshop on Analytics for Network and Service Management (AnNet)}, keywords = {myown net-man}, month = 4, title = {Optimizing HAS for 360-Degree Videos}, year = 2020 }
45.
Wehner, N.: Machine Learning-based Real-time Estimation of Quality of Experience from Encrypted Video Streaming Traffic. , 1st KuVS Workshop on Machine Learning for Networking, Munich, Germany (2020).
[ BibTeX ]
 
@presentation{info3-presentation-2020-1, address = {1st KuVS Workshop on Machine Learning for Networking, Munich, Germany}, author = {Wehner, Nikolas}, keywords = {myown ucn}, month = 2, title = {Machine Learning-based Real-time Estimation of Quality of Experience from Encrypted Video Streaming Traffic}, year = 2020 }
46.
Gall, D., Latoschik, M.E.: Visual angle modulates affective responses to audiovisual stimuli. Computers in Human Behavior. 109, 106346 (2020).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
What we see influences our emotions. Technology often mediates the visual content we perceive. Visual angle is an essential parameter of how we see such content. It operationalizes visible properties of human-computer interfaces. However, we know little about the content-independent effect of visual angle on emotional responses to audiovisual stimuli. We show that visual angle alone affects emotional responses to audiovisual features, independent of object perception. We conducted a 2 x 2 x 3 factorial repeated-measures experiment with 143 undergraduate students. We simultaneously presented monochrome rectangles with pure tones and assessed valence, arousal, and dominance. In the high visual angle condition, arousal increased, valence and dominance decreased, and lightness modulated arousal. In the low visual angle condition, pitch modulated arousal, and lightness affected valence. Visual angle weights the affective relevance of perception modalities independent of spatial representations. Visual angle serves as an early-stage perceptual feature for organizing emotional responses. Control of this presentation layer allows for provoking or avoiding emotional response where intended.
@article{gall2020visual, abstract = {What we see influences our emotions. Technology often mediates the visual content we perceive. Visual angle is an essential parameter of how we see such content. It operationalizes visible properties of human-computer interfaces. However, we know little about the content-independent effect of visual angle on emotional responses to audiovisual stimuli. We show that visual angle alone affects emotional responses to audiovisual features, independent of object perception. We conducted a 2 x 2 x 3 factorial repeated-measures experiment with 143 undergraduate students. We simultaneously presented monochrome rectangles with pure tones and assessed valence, arousal, and dominance. In the high visual angle condition, arousal increased, valence and dominance decreased, and lightness modulated arousal. In the low visual angle condition, pitch modulated arousal, and lightness affected valence. Visual angle weights the affective relevance of perception modalities independent of spatial representations. Visual angle serves as an early-stage perceptual feature for organizing emotional responses. Control of this presentation layer allows for provoking or avoiding emotional response where intended.}, author = {Gall, Dominik and Latoschik, Marc Erich}, journal = {Computers in Human Behavior}, keywords = {myown}, month = {August 2020}, pages = 106346, title = {Visual angle modulates affective responses to audiovisual stimuli}, volume = 109, year = 2020 }
47.
Byrka, J., Lewandowski, M., Spoerhase, J.: Approximating Node-Weighted k-MST on Planar Graphs. Theory of Computing Systems. (2020).
[ BibTeX ] [ DOI ]
 
@article{byrka2020approximating, author = {Byrka, Jarosław and Lewandowski, Mateusz and Spoerhase, Joachim}, journal = {Theory of Computing Systems}, keywords = {dual myown network optimization planar primal tree}, title = {Approximating Node-Weighted k-MST on Planar Graphs}, year = 2020 }
48.
Bucher, K., Oberdörfer, S., Grafe, S., Latoschik, M.E.: Von Medienbeiträgen und Applikationen - ein interdisziplinäres Konzept zum Lehren und Lernen mit Augmented und Virtual Reality für die Hochschullehre. In: Knaus, T. und Merz, O. (hrsg.) Schnittstellen und Interfaces - Digitaler Wandel in Bildungseinrichtungen. S. 225–238. kopaed, Munich, Germany (2020).
[ BibTeX ] [ URL ]
 
@incollection{bucher2020medienbeitrgen, address = {Munich, Germany}, author = {Bucher, Kristina and Oberdörfer, Sebastian and Grafe, Silke and Latoschik, Marc Erich}, booktitle = {Schnittstellen und Interfaces - Digitaler Wandel in Bildungseinrichtungen}, editor = {Knaus, Thomas and Merz, Olga}, keywords = {myown oberdoerfer varyfast}, pages = {225-238}, publisher = {kopaed}, series = {fraMediale}, title = {Von Medienbeiträgen und Applikationen - ein interdisziplinäres Konzept zum Lehren und Lernen mit Augmented und Virtual Reality für die Hochschullehre}, volume = 7, year = 2020 }
49.
Gray, N.: Evaluation of Offloading Firewall Rules with P4, (2020).
[ Abstract ] [ BibTeX ]
 
Contact: nicholas.gray@informatik.uni-wuerzburg.de Firewalls are classical network middle boxes, which are physically implemented within the data path. Following this design pattern causes the network to become inflexible and harder to scale as additional hardware devices have to be deployed whenever the limits of the current configuration are reached, resulting in a high maintenance and requisition cost. Network Function Virtualization (NFV) is a novel paradigm aiming to mitigate these drawbacks by shifting the function of hardware middle boxes to software programs run on Commodity of the Shelf servers. While increasing the network flexibility, it also imposes additional delays on the data path as the complete networking and software stack has to be traversed for each packet. P4 allows the execution and packet matching process on inexpensive, programmable networking cards at line rate. Goal of the thesis is the implementation and evaluation of a distributed stateful firewall based on P4.
@mastersthesis{info3-master-2017-7, abstract = {Contact: nicholas.gray@informatik.uni-wuerzburg.de Firewalls are classical network middle boxes, which are physically implemented within the data path. Following this design pattern causes the network to become inflexible and harder to scale as additional hardware devices have to be deployed whenever the limits of the current configuration are reached, resulting in a high maintenance and requisition cost. Network Function Virtualization (NFV) is a novel paradigm aiming to mitigate these drawbacks by shifting the function of hardware middle boxes to software programs run on Commodity of the Shelf servers. While increasing the network flexibility, it also imposes additional delays on the data path as the complete networking and software stack has to be traversed for each packet. P4 allows the execution and packet matching process on inexpensive, programmable networking cards at line rate. Goal of the thesis is the implementation and evaluation of a distributed stateful firewall based on P4.}, author = {Gray, Nicholas}, keywords = {myown ngn}, school = {University of Wuerzburg}, title = {Evaluation of Offloading Firewall Rules with P4}, year = 2020 }
50.
Oberdörfer, S., Heidrich, D., Latoschik, M.E.: Think Twice: The Influence of Immersion on Decision Making during Gambling in Virtual Reality. Proceedings of the 27th IEEE Virtual Reality conference (VR ’20). S. 483–492. IEEE, Atlanta, USA (2020).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
Immersive Virtual Reality (VR) is increasingly being explored as an alternative medium for gambling games to attract players. Typically, gambling games try to impair a player’s decision making, usually for the disadvantage of the players’ financial outcome. An impaired decision making results in the inability to differentiate between advantageous and disadvantageous options. We investigated if and how immersion impacts decision making using a VR-based realization of the Iowa Gambling Task (IGT) to pinpoint potential risks and effects of gambling in VR. During the IGT, subjects are challenged to draw cards from four different decks of which two are advantageous. The selections made serve as a measure of a participant’s decision making during the task. In a novel user study, we compared the effects of immersion on decision making between a low-immersive desktop-3D-based IGT realization and a high immersive VR version. Our results revealed significantly more disadvantageous decisions when playing the immersive VR version. This indicates an impair- ing effect of immersion on simulated real life decision making and provides empirical evidence for a high risk potential of gambling games targeting immersive VR.
@inproceedings{oberdorfer2020think, abstract = {Immersive Virtual Reality (VR) is increasingly being explored as an alternative medium for gambling games to attract players. Typically, gambling games try to impair a player’s decision making, usually for the disadvantage of the players’ financial outcome. An impaired decision making results in the inability to differentiate between advantageous and disadvantageous options. We investigated if and how immersion impacts decision making using a VR-based realization of the Iowa Gambling Task (IGT) to pinpoint potential risks and effects of gambling in VR. During the IGT, subjects are challenged to draw cards from four different decks of which two are advantageous. The selections made serve as a measure of a participant’s decision making during the task. In a novel user study, we compared the effects of immersion on decision making between a low-immersive desktop-3D-based IGT realization and a high immersive VR version. Our results revealed significantly more disadvantageous decisions when playing the immersive VR version. This indicates an impair- ing effect of immersion on simulated real life decision making and provides empirical evidence for a high risk potential of gambling games targeting immersive VR.}, address = {Atlanta, USA}, author = {Oberdörfer, Sebastian and Heidrich, David and Latoschik, Marc Erich}, booktitle = {Proceedings of the 27th IEEE Virtual Reality conference (VR '20)}, keywords = {myown oberdoerfer}, month = {March}, organization = {IEEE}, pages = {483-492}, title = {Think Twice: The Influence of Immersion on Decision Making during Gambling in Virtual Reality}, year = 2020 }
51.
Byrka, J., Lewandowski, M., Meesum, S.M., Spoerhase, J., Uniyal, S.: PTAS for Steiner Tree on Map Graphs. Proc. 14th Latin American Theoretical Informatics Symposium (LATIN’20) (2020).
[ BibTeX ]
 
@inproceedings{byrka2020steiner, author = {Byrka, Jaroslaw and Lewandowski, Mateusz and Meesum, Syed Mohammad and Spoerhase, Joachim and Uniyal, Sumedha}, booktitle = {Proc. 14th Latin American Theoretical Informatics Symposium (LATIN'20)}, keywords = {algorithm approximation myown network optimization tree}, title = {PTAS for Steiner Tree on Map Graphs}, year = 2020 }
52.
Kaufmann, M., Kratochvil, J., Lipp, F., Montecchiani, F., Raftopoulou, C., Valtr, P.: The Stub Resolution of 1-Planar Graphs. In: Rahman, M.S., Sadakane, K., und Sung, W.-K. (hrsg.) WALCOM: Algorithms and Computation. S. 170–182. Springer (2020).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
The resolution of a drawing plays a crucial role when defining criteria for its quality. In the past, grid resolution, edge-length resolution, angular resolution and crossing resolution have been investigated. In this paper, we investigate the stub resolution, a recently introduced criterion for nonplanar drawings. A crossed edge is divided into parts, called stubs, which should not be too short for the sake of readability. Thus, the stub resolution of a drawing is defined as the minimum ratio between the length of a stub and the length of the entire edge, over all the edges of the drawing. We consider 1-planar graphs and we explore scenarios in which near optimal stub resolution, i.e. arbitrarily close to \\($\$\)\backslashfrac\1\\2\\\($\$\), can be obtained in drawings with zero, one, or two bends per edge, as well as further resolution criteria, such as angular and crossing resolution. In particular, our main contributions are as follows: (i) Every 1-planar graph with independent crossing edges has a straight-line drawing with near optimal stub resolution; (ii) Every 1-planar graph has a 1-bend drawing with near optimal stub resolution.
@inproceedings{10.1007/978-3-030-39881-1_15, abstract = {The resolution of a drawing plays a crucial role when defining criteria for its quality. In the past, grid resolution, edge-length resolution, angular resolution and crossing resolution have been investigated. In this paper, we investigate the stub resolution, a recently introduced criterion for nonplanar drawings. A crossed edge is divided into parts, called stubs, which should not be too short for the sake of readability. Thus, the stub resolution of a drawing is defined as the minimum ratio between the length of a stub and the length of the entire edge, over all the edges of the drawing. We consider 1-planar graphs and we explore scenarios in which near optimal stub resolution, i.e. arbitrarily close to {\$}{\$}{\backslash}frac{\{}1{\}}{\{}2{\}}{\$}{\$}, can be obtained in drawings with zero, one, or two bends per edge, as well as further resolution criteria, such as angular and crossing resolution. In particular, our main contributions are as follows: (i) Every 1-planar graph with independent crossing edges has a straight-line drawing with near optimal stub resolution; (ii) Every 1-planar graph has a 1-bend drawing with near optimal stub resolution.}, author = {Kaufmann, Michael and Kratochvil, Jan and Lipp, Fabian and Montecchiani, Fabrizio and Raftopoulou, Chrysanthi and Valtr, Pavel}, booktitle = {WALCOM: Algorithms and Computation}, editor = {Rahman, M. Sohel and Sadakane, Kunihiko and Sung, Wing-Kin}, keywords = {1-planar graph-drawing myown resolution stub}, pages = {170–182}, publisher = {Springer}, series = {Lecture Notes in Computer Science}, title = {The Stub Resolution of 1-Planar Graphs}, volume = 12049, year = 2020 }
53.
Vomhoff, V.: Reliability of Crowdsourced Measurements, (2020).
[ BibTeX ]
 
@mastersthesis{info3-praktikum-2019-12, author = {Vomhoff, Viktoria}, keywords = {myown}, month = 10, school = {Universitiy of Würzburg}, title = {Reliability of Crowdsourced Measurements}, year = 2020 }
54.
Dworschak, N.-D.: Evaluating Temporal Impairments in Music Streaming, (2020).
[ BibTeX ]
 
@mastersthesis{info3-bachelor-2019-11, author = {Dworschak, Nemo-Dario}, keywords = {myown}, school = {University of Würzburg}, title = {Evaluating Temporal Impairments in Music Streaming}, year = 2020 }
55.
Borchert, K., Seufert, M., Hildebrand, K., Hoßfeld, T.: QoE Assessment of Enterprise Applications based on Self-motivated Ratings. 12th International Conference on Quality of Multimedia Experience (QoMEX). , Athlone, Ireland (2020).
[ Abstract ] [ BibTeX ]
 
In most companies, enterprise applications, such as office products or databases, are heavily used by employees during work hours. Impairments and performance issues not only slow down business processes, but might also increase the frustration of the workforce. While Quality of Experience (QoE) has been widely studied for personal multimedia applications, such as video streaming, its application to the business usage domain is still in its infancy. Due to several reasons, e.g., the high complexity of IT infrastructure, classical QoE studies can hardly be transferred to business applications. These studies are often independent from the context of usage and actively poll ratings from their participants. This work contrasts the commonly used "pull" method for collecting user ratings with a self-motivated "push" approach. This approach is inspired by complaint systems, in which users can directly report problems with a technical system as soon as they notice them. Therefore, performance assessments of a business application from employees of a cooperating company are collected with both rating systems during a time span of 1.5 years. Besides the analysis of the interaction of users with the "push" system, differences between the two methods are discussed. Further, QoE models for the monitored business application are derived based on the self-motivated "push" ratings.
@inproceedings{info3-inproceedings-2020-3, abstract = {In most companies, enterprise applications, such as office products or databases, are heavily used by employees during work hours. Impairments and performance issues not only slow down business processes, but might also increase the frustration of the workforce. While Quality of Experience (QoE) has been widely studied for personal multimedia applications, such as video streaming, its application to the business usage domain is still in its infancy. Due to several reasons, e.g., the high complexity of IT infrastructure, classical QoE studies can hardly be transferred to business applications. These studies are often independent from the context of usage and actively poll ratings from their participants. This work contrasts the commonly used "pull" method for collecting user ratings with a self-motivated "push" approach. This approach is inspired by complaint systems, in which users can directly report problems with a technical system as soon as they notice them. Therefore, performance assessments of a business application from employees of a cooperating company are collected with both rating systems during a time span of 1.5 years. Besides the analysis of the interaction of users with the "push" system, differences between the two methods are discussed. Further, QoE models for the monitored business application are derived based on the self-motivated "push" ratings.}, address = {Athlone, Ireland}, author = {Borchert, Kathrin and Seufert, Michael and Hildebrand, Kathrin and Hoßfeld, Tobias}, booktitle = {12th International Conference on Quality of Multimedia Experience (QoMEX)}, keywords = {myown kubus ua-net}, month = 5, title = {QoE Assessment of Enterprise Applications based on Self-motivated Ratings}, year = 2020 }
56.
Halloway, M.: Investigating the Influence of App Browsing Delays on the QoE of Music Streaming, (2020).
[ BibTeX ]
 
@mastersthesis{info3-bachelor-2019-18, author = {Halloway, Mohamad}, keywords = {myown}, school = {University of Würzburg}, title = {Investigating the Influence of App Browsing Delays on the QoE of Music Streaming}, year = 2020 }
57.
Brefeld, U., Fromont, Élisa, Hotho, A., Knobbe, A.J., Maathuis, M.H., Robardet, C. hrsg.: Machine Learning and Knowledge Discovery in Databases - European Conference, ECML PKDD 2019, Würzburg, Germany, September 16-20, 2019, Proceedings, Part III. Springer (2020).
[ BibTeX ] [ URL ]
 
@proceedings{brefeld2020machine1, booktitle = {ECML/PKDD (3)}, editor = {Brefeld, Ulf and Fromont, Élisa and Hotho, Andreas and Knobbe, Arno J. and Maathuis, Marloes H. and Robardet, Céline}, keywords = {2020 ECMLPKDD myown proceedings}, publisher = {Springer}, series = {Lecture Notes in Computer Science}, title = {Machine Learning and Knowledge Discovery in Databases - European Conference, ECML PKDD 2019, Würzburg, Germany, September 16-20, 2019, Proceedings, Part III}, volume = 11908, year = 2020 }
58.
Seufert, M., Kargl, J., Schauer, J., Nüchter, A., Hoßfeld, T.: Different Points of View: Impact of 3D Point Cloud Reduction on QoE of Rendered Images. 12th International Conference on Quality of Multimedia Experience (QoMEX). , Athlone, Ireland (2020).
[ Abstract ] [ BibTeX ]
 
Modern photogrammetric methods as well as laser measurement systems make it easy to collect large 3D point clouds that sample objects or environments. As the recorded point clouds can be used to render computer-generated images and models, they are of particular interest in the domains of geographical and architectural engineering, as well for computer graphics (e.g., games or virtual reality). However, point clouds have a huge storage demand, thus, point clouds shall be reduced by removing some of the points. This will inevitably also reduce the Quality of Experience (QoE) of media, which is rendered from the reduced point clouds. In this work, the impact of two different reduction methods on the QoE of rendered images is investigated from two point of views, i.e., based on ratings from both naive crowdworkers as well as point cloud experts.
@inproceedings{info3-inproceedings-2020-4, abstract = {Modern photogrammetric methods as well as laser measurement systems make it easy to collect large 3D point clouds that sample objects or environments. As the recorded point clouds can be used to render computer-generated images and models, they are of particular interest in the domains of geographical and architectural engineering, as well for computer graphics (e.g., games or virtual reality). However, point clouds have a huge storage demand, thus, point clouds shall be reduced by removing some of the points. This will inevitably also reduce the Quality of Experience (QoE) of media, which is rendered from the reduced point clouds. In this work, the impact of two different reduction methods on the QoE of rendered images is investigated from two point of views, i.e., based on ratings from both naive crowdworkers as well as point cloud experts.}, address = {Athlone, Ireland}, author = {Seufert, Michael and Kargl, Julian and Schauer, Johannes and Nüchter, Andreas and Hoßfeld, Tobias}, booktitle = {12th International Conference on Quality of Multimedia Experience (QoMEX)}, keywords = {myown ua-net}, month = 5, title = {Different Points of View: Impact of 3D Point Cloud Reduction on QoE of Rendered Images}, year = 2020 }
59.
Supervisor: Metzger, F.: Vehicular and Wireless Traffic Simulation and Optimization under Urban Mobility, (2020).
[ Abstract ] [ BibTeX ]
 
Modern cities have complex interactions of vehicular, pedestrian and wireless networks. Any communal wireless network should strive to fullfil these demands. Your task would be to create a model of the city of Würzburg in SUMO (Simulation of Urban MObility) and OMNeT++ in order to evaluate Würzburg's (wireless) traffic demands and subsequently optimize them.
@mastersthesis{info3-master-2020-6, abstract = {Modern cities have complex interactions of vehicular, pedestrian and wireless networks. Any communal wireless network should strive to fullfil these demands. Your task would be to create a model of the city of Würzburg in SUMO (Simulation of Urban MObility) and OMNeT++ in order to evaluate Würzburg's (wireless) traffic demands and subsequently optimize them.}, author = {Supervisor: Metzger, Florian}, keywords = {myown fullstack}, month = 7, school = {University of Würzburg}, title = {Vehicular and Wireless Traffic Simulation and Optimization under Urban Mobility}, year = 2020 }
60.
Oyanagi, A., Narumi, T., Lugrin, J.-L., Ando, H., Ohmura, R.: Reducing the Fear of Height by Inducing Proteus Effect of a Dragon Avatar. Journal of the Virtual Reality Society of Japan (2020).
[ BibTeX ] [ URL ]
 
@inproceedings{oyanagi, author = {Oyanagi, Akimi and Narumi, Takuji and Lugrin, Jean-Luc and Ando, Hideyuki and Ohmura, Ren}, journal = {Journal of the Virtual Reality Society of Japan}, keywords = {lugrin myown}, note = {(to appear)}, number = 1, title = {Reducing the Fear of Height by Inducing Proteus Effect of a Dragon Avatar}, volume = 25, year = 2020 }
61.
Korger, A., Baumeister, J.: Case-Based Generation of Regulatory Documents and their Semantic Relatedness. Proceedings of the Future of Information and Communications Conference (FICC) 2020. Springer, San Francisco (2020).
[ BibTeX ]
 
@inproceedings{korger2020casebased, address = {San Francisco.}, author = {Korger, Andreas and Baumeister, Joachim}, booktitle = {Proceedings of the Future of Information and Communications Conference (FICC) 2020}, keywords = {knowwe myown rokt}, month = {March}, publisher = {Springer}, series = {Advances in Intelligent Systems and Computing}, title = {Case-Based Generation of Regulatory Documents and their Semantic Relatedness}, year = 2020 }
62.
Fehler, H.: Comparison of Web QoE Algorithms on Different Devices, (2020).
[ Abstract ] [ BibTeX ]
 
Contact/Kontakt: nikolas.wehner@informatik.uni-wuerzburg.de Impairments in the Web QoE, e.g., low page load times, can lead to annoyed users which in the end can result in revenue losses for companies. In literature, several algorithm exist for predicting the Web QoE, e.g. Speed Index, Above the Fold, etc. Based on data from a measurement study, these algorithms shall be evaluated and compared in this work. In particular, a comparison of the metrics among the devices (Smartphone, Tablet, Desktop PC), which were used to generate the measurement data, is of interest.
@mastersthesis{info3-bachelor-2019-19, abstract = {Contact/Kontakt: nikolas.wehner@informatik.uni-wuerzburg.de Impairments in the Web QoE, e.g., low page load times, can lead to annoyed users which in the end can result in revenue losses for companies. In literature, several algorithm exist for predicting the Web QoE, e.g. Speed Index, Above the Fold, etc. Based on data from a measurement study, these algorithms shall be evaluated and compared in this work. In particular, a comparison of the metrics among the devices (Smartphone, Tablet, Desktop PC), which were used to generate the measurement data, is of interest.}, author = {Fehler, Helena}, keywords = {myown ucn}, school = {University of Würzburg}, title = {Comparison of Web QoE Algorithms on Different Devices}, year = 2020 }
63.
Peng, D., Wolff, A., Haunert, J.-H.: Finding Optimal Sequences for Area Aggregation---A* vs. Integer Linear Programming. ACM Transactions on Spatial Algorithms and Systems. 7, (2020).
[ Abstract ] [ BibTeX ] [ DOI ]
 
To provide users with maps of different scales and to allow them to zoom in and out without losing context, automatic methods for map generalization are needed. We approach this problem for land-cover maps. Given two land-cover maps at two different scales, we want to find a sequence of small incremental changes that gradually transforms one map into the other. We assume that the two input maps consist of polygons, each of which belongs to a given land-cover type. Every polygon on the smaller-scale map is the union of a set of adjacent polygons on the larger-scale map. par In each step of the computed sequence, the smallest area is merged with one of its neighbors. We do not select that neighbor according to a prescribed rule but compute the whole sequence of pairwise merges at once, based on global optimization. We have proved that this problem is NP-hard. We formalize this optimization problem as that of finding a shortest path in a (very large) graph. We present the A\($^\star$\) algorithm and integer linear programming to solve this optimization problem. To avoid long computing times, we allow the two methods to return non-optimal results. In addition, we present a greedy algorithm as a benchmark. We tested the three methods with a dataset of the official German topographic database ATKIS. Our main result is that A\($^\star$\) finds optimal aggregation sequences for more instances than the other two methods within a given time frame.
@article{pwh-fosaa-TSAS20, abstract = {To provide users with maps of different scales and to allow them to zoom in and out without losing context, automatic methods for map generalization are needed. We approach this problem for land-cover maps. Given two land-cover maps at two different scales, we want to find a sequence of small incremental changes that gradually transforms one map into the other. We assume that the two input maps consist of polygons, each of which belongs to a given land-cover type. Every polygon on the smaller-scale map is the union of a set of adjacent polygons on the larger-scale map. \par In each step of the computed sequence, the smallest area is merged with one of its neighbors. We do not select that neighbor according to a prescribed rule but compute the whole sequence of pairwise merges at once, based on global optimization. We have proved that this problem is NP-hard. We formalize this optimization problem as that of finding a shortest path in a (very large) graph. We present the A$^\star$ algorithm and integer linear programming to solve this optimization problem. To avoid long computing times, we allow the two methods to return non-optimal results. In addition, we present a greedy algorithm as a benchmark. We tested the three methods with a dataset of the official German topographic database ATKIS. Our main result is that A$^\star$ finds optimal aggregation sequences for more instances than the other two methods within a given time frame.}, author = {Peng, Dongliang and Wolff, Alexander and Haunert, Jan-Henrik}, journal = {ACM Transactions on Spatial Algorithms and Systems}, keywords = {compactness continuous_map_generalization land_cover myown shortest_path type_change}, note = {article 4 (40 pages)}, number = 1, title = {Finding Optimal Sequences for Area Aggregation—{A}* vs.\ Integer Linear Programming}, volume = 7, year = 2020 }
64.
Janiak, L.: Potential Traffic Savings by Leveraging Proximity of Communication Groups in Mobile Messaging Applications, (2020).
[ BibTeX ]
 
@mastersthesis{info3-master-2019-8, author = {Janiak, Lea}, keywords = {myown}, month = 12, school = {University of Würzburg}, title = {Potential Traffic Savings by Leveraging Proximity of Communication Groups in Mobile Messaging Applications}, year = 2020 }
65.
Aliev, E.: Evaluation of the Impact of Web Cross-Traffic on TCP and QUIC Video Streaming, (2020).
[ BibTeX ]
 
@mastersthesis{info3-bachelor-2019-6, author = {Aliev, Emil}, keywords = {myown}, month = 9, school = {University of Würzburg}, title = {Evaluation of the Impact of Web Cross-Traffic on TCP and QUIC Video Streaming}, year = 2020 }
66.
Chaplick, S., Förster, H., Kryven, M., Wolff, A.: Drawing Graphs with Circular Arcs and Right-Angle Crossings. In: Albers, S. (hrsg.) Proc. 17th Scand. Symp. and Workshops on Algorithm Theory (SWAT’20). S. 21:1–21:14. Schloss Dagstuhl~-- Leibniz-Zentrum für Informatik (2020).
[ BibTeX ] [ DOI ]
 
@inproceedings{cfkw-dgcar-SWAT20, author = {Chaplick, Steven and F{ö}rster, Henry and Kryven, Myroslav and Wolff, Alexander}, booktitle = {Proc. 17th Scand. Symp. and Workshops on Algorithm Theory (SWAT'20)}, editor = {Albers, Susanne}, keywords = {charging_argument circular_arcs edge_density myown right-angle_crossings}, pages = {21:1–21:14}, publisher = {Schloss Dagstuhl – Leibniz-Zentrum f{ü}r Informatik}, series = {LIPIcs}, title = {Drawing Graphs with Circular Arcs and Right-Angle Crossings}, volume = 162, year = 2020 }
67.
Chaplick, S., van Dijk, T.C., Kryven, M., Park, J.-W., Ravsky, A., Wolff, A.: Bundled Crossings Revisited. Journal of Graph Algorithms & Applications. 24, 621–655 (2020).
[ Abstract ] [ BibTeX ] [ DOI ]
 
An effective way to reduce clutter in a graph drawing that has (many) crossings is to group edges that travel in parallel into bundles. Each edge can participate in many such bundles. Any crossing in this bundled graph occurs between two bundles, i.e., as a bundled crossing. We consider the problem of bundled crossing minimization: A graph is given and the goal is to find a bundled drawing with at most \($k$\) bundled crossings. We show that the problem is NP-hard when we require a simple drawing. Our main result is an FPT algorithm (in \($k$\)) for simple circular layouts where vertices must be placed on a circle and edges must be drawn inside the circle. These results make use of the connection between bundled crossings and graph genus. We also consider bundling crossings in a given drawing, in particular for storyline visualizations.
@article{cdkprw-bcr-JGAA20, abstract = {An effective way to reduce clutter in a graph drawing that has (many) crossings is to group edges that travel in parallel into bundles. Each edge can participate in many such bundles. Any crossing in this bundled graph occurs between two bundles, i.e., as a bundled crossing. We consider the problem of bundled crossing minimization: A graph is given and the goal is to find a bundled drawing with at most $k$ bundled crossings. We show that the problem is NP-hard when we require a simple drawing. Our main result is an FPT algorithm (in $k$) for simple circular layouts where vertices must be placed on a circle and edges must be drawn inside the circle. These results make use of the connection between bundled crossings and graph genus. We also consider bundling crossings in a given drawing, in particular for storyline visualizations.}, author = {Chaplick, Steven and van Dijk, Thomas C. and Kryven, Myroslav and Park, Ji-Won and Ravsky, Alexander and Wolff, Alexander}, journal = {Journal of Graph Algorithms \& Applications}, keywords = {NP-hard bundled_crossings circular_layout extended_monadic_second_order_logic fixed-parameter_tractable myown storyline_visualization}, number = 4, pages = {621–655}, title = {Bundled Crossings Revisited}, volume = 24, year = 2020 }
68.
Hildebrand, K.: Impact of Rendering Times on the Perceived Loading Speed of Web Pages, (2020).
[ Abstract ] [ BibTeX ]
 
Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Impact of Rendering Times on the Perceived Loading Speed of Web Pages Abstract: The most dominant QoE (Quality of Experience, i.e., subjectively perceived quality) influence factor of web browsing is the page load time. However, pages do not load in a single event, but different parts of the web page are displayed at different rendering times. In this work, a study shall be conducted to investigate the impact of rendering times on the perceived loading speed of web pages. The results of the study shall be evaluated to derive recommendations for networking as well as rendering aspects of web browsing. Titel: Einfluss von Anzeigezeiten auf die wahrgenomme Ladegeschwindigkeit von Webseiten Inhalt: Der wichtigste Einflussfaktor auf die QoE (Quality of Experience, d.h. subjektiv empfundene Dienstgüte) beim Webbrowsing ist die Seitenladezeit. Jedoch laden Webseiten nicht auf einmal, sondern verschiedene Teile der Seite werden zu unterschiedlichen Zeitpunkten angezeigt. In dieser Arbeit soll eine Studie durchgeführt werden, mit der der Einfluss dieser Anzeigezeiten auf die wahrgenommene Ladegeschwindigkeit untersucht werden kann. Die Ergebnisse der Studie sollen ausgewehrtet werden, um Empfehlungen für Netzwerk- und Renderingaspekte beim Webbrowsen abzuleiten.
@mastersthesis{info3-bachelor-2019-14, abstract = {Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Impact of Rendering Times on the Perceived Loading Speed of Web Pages Abstract: The most dominant QoE (Quality of Experience, i.e., subjectively perceived quality) influence factor of web browsing is the page load time. However, pages do not load in a single event, but different parts of the web page are displayed at different rendering times. In this work, a study shall be conducted to investigate the impact of rendering times on the perceived loading speed of web pages. The results of the study shall be evaluated to derive recommendations for networking as well as rendering aspects of web browsing. Titel: Einfluss von Anzeigezeiten auf die wahrgenomme Ladegeschwindigkeit von Webseiten Inhalt: Der wichtigste Einflussfaktor auf die QoE (Quality of Experience, d.h. subjektiv empfundene Dienstgüte) beim Webbrowsing ist die Seitenladezeit. Jedoch laden Webseiten nicht auf einmal, sondern verschiedene Teile der Seite werden zu unterschiedlichen Zeitpunkten angezeigt. In dieser Arbeit soll eine Studie durchgeführt werden, mit der der Einfluss dieser Anzeigezeiten auf die wahrgenommene Ladegeschwindigkeit untersucht werden kann. Die Ergebnisse der Studie sollen ausgewehrtet werden, um Empfehlungen für Netzwerk- und Renderingaspekte beim Webbrowsen abzuleiten.}, author = {Hildebrand, Kathrin}, keywords = {myown ucn}, month = 5, school = {University of Würzburg}, title = {Impact of Rendering Times on the Perceived Loading Speed of Web Pages}, year = 2020 }
69.
Chaplick, S., Fleszar, K., Lipp, F., Ravsky, A., Verbitsky, O., Wolff, A.: Drawing Graphs on Few Lines and Few Planes. Journal of Computational Geometry. 11, 433–475 (2020).
[ Abstract ] [ BibTeX ] [ DOI ]
 
We investigate the problem of drawing graphs in 2D and 3D such that their edges (or only their vertices) can be covered by few lines or planes. We insist on straight-line edges and crossing-free drawings. This problem has many relations to other challenging graph-drawing problems such as small-area or small-volume drawings, layered or track drawings, and drawing graphs with low visual complexity. While some facts about our problem are implicit in previous work, this is the first treatment of the problem in its full generality. Our contribution is as follows. par We show lower and upper bounds for the numbers of lines and planes needed for covering drawings of graphs in certain graph classes. In some cases our bounds are asymptotically tight; in some cases we are able to determine exact values. par We relate our parameters to standard combinatorial characteristics of graphs (such as the chromatic number, treewidth, or arboricity) and to parameters that have been studied in graph drawing (such as the track number or the number of segments appearing in a drawing). par We pay special attention to planar graphs. For example, we show that there are qplanar graphs that can be drawn in 3-space on asymptotically fewer lines than in the plane.
@article{cflrvw-dgflf-JoCG20, abstract = {We investigate the problem of drawing graphs in 2D and 3D such that their edges (or only their vertices) can be covered by few lines or planes. We insist on straight-line edges and crossing-free drawings. This problem has many relations to other challenging graph-drawing problems such as small-area or small-volume drawings, layered or track drawings, and drawing graphs with low visual complexity. While some facts about our problem are implicit in previous work, this is the first treatment of the problem in its full generality. Our contribution is as follows. \par We show lower and upper bounds for the numbers of lines and planes needed for covering drawings of graphs in certain graph classes. In some cases our bounds are asymptotically tight; in some cases we are able to determine exact values. \par We relate our parameters to standard combinatorial characteristics of graphs (such as the chromatic number, treewidth, or arboricity) and to parameters that have been studied in graph drawing (such as the track number or the number of segments appearing in a drawing). \par We pay special attention to planar graphs. For example, we show that there are qplanar graphs that can be drawn in 3-space on asymptotically fewer lines than in the plane.}, author = {Chaplick, Steven and Fleszar, Krzysztof and Lipp, Fabian and Ravsky, Alexander and Verbitsky, Oleg and Wolff, Alexander}, journal = {Journal of Computational Geometry}, keywords = {(weak)_line_cover_number (weak)_plane_cover_number affine_cover_number myown non-planar_graphs}, number = 1, pages = {433–475}, title = {Drawing Graphs on Few Lines and Few Planes}, volume = 11, year = 2020 }
70.
Kargl, J.: Analysis of QoE Aspects of 3D Point Cloud Reduction, (2020).
[ BibTeX ]
 
@mastersthesis{info3-bachelor-2019-13, author = {Kargl, Julian}, keywords = {myown}, month = 3, school = {University of Würzburg}, title = {Analysis of QoE Aspects of 3D Point Cloud Reduction}, year = 2020 }
71.
Chaplick, S., Kindermann, P., Löffler, A., Thiele, F., Wolff, A., Zaft, A., Zink, J.: Stick Graphs with and without Length Constraints. Journal of Graph Algorithms & Applications. 24, 657–681 (2020).
[ Abstract ] [ BibTeX ] [ DOI ]
 
Stick graphs are intersection graphs of horizontal and vertical line seg- ments that all touch a line of slope −1 and lie above this line. De Luca et al. [GD'18] considered the recognition problem of stick graphs when no order is given (STICK), when the order of either one of the two sets is given (STICK\($_A$\)), and when the order of both sets is given (STICK\($_AB$\)). They showed how to solve STICK\($_AB$\) efficiently. par In this paper, we improve the running time of their algorithm, and we solve STICK\($_A$\) efficiently. Further, we consider variants of these problems where the lengths of the sticks are given as input. We show that these variants of STICK, STICK\($_A$\), and STICK\($_AB$\) are all NP-complete. On the positive side, we give an efficient solution for STICK\($_AB$\) with fixed stick lengths if there are no isolated vertices.
@article{ckltwzz-sglc-JGAA20, abstract = {Stick graphs are intersection graphs of horizontal and vertical line seg- ments that all touch a line of slope −1 and lie above this line. De Luca et al. [GD'18] considered the recognition problem of stick graphs when no order is given (STICK), when the order of either one of the two sets is given (STICK$_A$), and when the order of both sets is given (STICK$_{AB}$). They showed how to solve STICK$_{AB}$ efficiently. \par In this paper, we improve the running time of their algorithm, and we solve STICK$_A$ efficiently. Further, we consider variants of these problems where the lengths of the sticks are given as input. We show that these variants of STICK, STICK$_A$, and STICK$_{AB}$ are all NP-complete. On the positive side, we give an efficient solution for STICK$_{AB}$ with fixed stick lengths if there are no isolated vertices.}, author = {Chaplick, Steven and Kindermann, Philipp and L{ö}ffler, Andre and Thiele, Florian and Wolff, Alexander and Zaft, Alexander and Zink, Johannes}, journal = {Journal of Graph Algorithms \& Applications}, keywords = {myown}, number = 4, pages = {657–681}, title = {Stick Graphs with and without Length Constraints}, volume = 24, year = 2020 }
72.
Ziegler, P., Mammen, textbfSebastian von: Generating Real-Time Strategy Heightmaps using Cellular Automata. FDG ’20: Proceedings of the 15th International Conference on the Foundations of Digital Games. ACM, Bugibba, Malta (2020).
[ Abstract ] [ BibTeX ] [ DOI ]
 
This paper presents a new approach of heightmap generation for Real-Time Strategy games (RTS) based on Cellular Automata (CA) in the context of various established techniques. The proposed approach uses different CA rulesets to generate and modify maps for the RTS game Supreme Commander. To evaluate the quality of the generated maps, a survey was conducted asking 30 participants about map quality compared to user-generated maps. The participants rated the maps more balanced and novel but less aesthetically pleasing. The paper concludes with according future work propositions to improve the presented approach.
@inproceedings{Ziegler:2020aa, abstract = {This paper presents a new approach of heightmap generation for Real-Time Strategy games (RTS) based on Cellular Automata (CA) in the context of various established techniques. The proposed approach uses different CA rulesets to generate and modify maps for the RTS game Supreme Commander. To evaluate the quality of the generated maps, a survey was conducted asking 30 participants about map quality compared to user-generated maps. The participants rated the maps more balanced and novel but less aesthetically pleasing. The paper concludes with according future work propositions to improve the presented approach.}, address = {Bugibba, Malta}, author = {Ziegler, Peter and \textbf{Sebastian {von Mammen}}}, booktitle = {FDG '20: Proceedings of the 15th International Conference on the Foundations of Digital Games}, keywords = {myown}, publisher = {ACM}, title = {Generating Real-Time Strategy Heightmaps using Cellular Automata}, year = 2020 }
73.
Borchert, K., Seufert, A., Gamboa, E., Hirth, M., Hoßfeld, T.: In vitro vs in vivo: does the study’s interface design influence crowdsourced video QoE?. Quality and User Experience. (2020).
[ Abstract ] [ BibTeX ]
 
Evaluating the Quality of Experience (QoE) of video streaming and its influence factors has become paramount for streaming providers, as they want to maintain high satisfaction for their customers. In this context, crowdsourced user studies became a valuable tool to evaluate different factors which can affect the perceived user experience on a large scale. In general, most of these crowdsourcing studies either use, what we refer to, as an in vivo or an in vitro interface design. In vivo design means that the study participant has to rate the QoE of a video that is embedded in an application similar to a real streaming service, e.g., YouTube or Netflix. In vitro design refers to a setting, in which the video stream is separated from a specific service and thus, the video plays on a plain background. Although these interface designs vary widely, the results are often compared and generalized. In this work, we use a crowdsourcing study to investigate the influence of three interface design alternatives, an in vitro and two in vivo designs with different levels of interactiveness, on the perceived video QoE. Contrary to our expectations, the results indicate that there is no significant influence of the study’s interface design in general on the video experience. Furthermore, we found that the in vivo design does not reduce the test takers’ attentiveness. However, we observed that participants who interacted with the test interface reported a higher video QoE than other groups.
@article{info3-article-2020-6, abstract = {Evaluating the Quality of Experience (QoE) of video streaming and its influence factors has become paramount for streaming providers, as they want to maintain high satisfaction for their customers. In this context, crowdsourced user studies became a valuable tool to evaluate different factors which can affect the perceived user experience on a large scale. In general, most of these crowdsourcing studies either use, what we refer to, as an in vivo or an in vitro interface design. In vivo design means that the study participant has to rate the QoE of a video that is embedded in an application similar to a real streaming service, e.g., YouTube or Netflix. In vitro design refers to a setting, in which the video stream is separated from a specific service and thus, the video plays on a plain background. Although these interface designs vary widely, the results are often compared and generalized. In this work, we use a crowdsourcing study to investigate the influence of three interface design alternatives, an in vitro and two in vivo designs with different levels of interactiveness, on the perceived video QoE. Contrary to our expectations, the results indicate that there is no significant influence of the study’s interface design in general on the video experience. Furthermore, we found that the in vivo design does not reduce the test takers’ attentiveness. However, we observed that participants who interacted with the test interface reported a higher video QoE than other groups.}, author = {Borchert, Kathrin and Seufert, Anika and Gamboa, Edwin and Hirth, Matthias and Hoßfeld, Tobias}, journal = {Quality and User Experience}, keywords = {myown ua-net}, month = 11, title = {In vitro vs in vivo: does the study’s interface design influence crowdsourced video QoE?}, year = 2020 }
74.
Hoßfeld, T., Heegaard, P.E., Skorin-Kapov, L., Varela, M.: Deriving QoE in systems: from fundamental relationships to a QoE‑based Service‑level Quality Index. Springer Quality and User Experience. 5, https://rdcu.be/b483m (2020).
[ Abstract ] [ BibTeX ]
 
With Quality of Experience (QoE) research having made significant advances over the years, service and network providers aim at user-centric evaluation of the services provided in their system. The question arises how to derive QoE in systems. In the context of subjective user studies conducted to derive relationships between influence factors and QoE, user diversity leads to varying distributions of user rating scores for different test conditions. Such models are commonly exploited by providers to derive various QoE metrics in their system, such as expected QoE, or the percentage of users rating above a certain threshold. The question then becomes how to combine (a) user rating distributions obtained from subjective studies, and (b) system parameter distributions, so as to obtain the actual observed QoE distribution in the system? Moreover, how can various QoE metrics of interest in the system be derived? We prove fundamental relationships for the derivation of QoE in systems, thus providing an important link between the QoE community and the systems community. In our numerical examples, we focus mainly on QoE metrics. We furthermore provide a more generalized view on quantifying the quality of systems by defining a QoE-based Service-level Quality Index. This index exploits the fact that quality can be seen as a proxy measure for utility. Following the assumption that not all user sessions should be weighted equally, we aim to provide a generic framework that can be utilized to quantify the overall utility of a service delivered by a system.
@article{info3-article-2020-2, abstract = {With Quality of Experience (QoE) research having made significant advances over the years, service and network providers aim at user-centric evaluation of the services provided in their system. The question arises how to derive QoE in systems. In the context of subjective user studies conducted to derive relationships between influence factors and QoE, user diversity leads to varying distributions of user rating scores for different test conditions. Such models are commonly exploited by providers to derive various QoE metrics in their system, such as expected QoE, or the percentage of users rating above a certain threshold. The question then becomes how to combine (a) user rating distributions obtained from subjective studies, and (b) system parameter distributions, so as to obtain the actual observed QoE distribution in the system? Moreover, how can various QoE metrics of interest in the system be derived? We prove fundamental relationships for the derivation of QoE in systems, thus providing an important link between the QoE community and the systems community. In our numerical examples, we focus mainly on QoE metrics. We furthermore provide a more generalized view on quantifying the quality of systems by defining a QoE-based Service-level Quality Index. This index exploits the fact that quality can be seen as a proxy measure for utility. Following the assumption that not all user sessions should be weighted equally, we aim to provide a generic framework that can be utilized to quantify the overall utility of a service delivered by a system.}, author = {Hoßfeld, Tobias and Heegaard, Poul E. and Skorin-Kapov, Lea and Varela, Martin}, journal = {Springer Quality and User Experience}, keywords = {myown dfg-sdn qoe-ia}, month = 7, number = 7, pages = {https://rdcu.be/b483m}, title = {Deriving QoE in systems: from fundamental relationships to a QoE‑based Service‑level Quality Index}, volume = 5, year = 2020 }
75.
Wamser, F., Alay, Özgü, Metzger, F., Valentin, S.: IJNM Special Issue - Editorial - QoE-centric Analysis and Management of Communication Networks. International Journal of Network Management. Special Issue: QoE-centric Analysis and Management of Communication Networks, (2020).
[ Abstract ] [ BibTeX ]
 
The heterogeneity and variability of Internet applications has increased considerably in recent years. Applications such as video streaming are responsible for a large part of data traffic on the Internet. Internet telephony and video conferencing systems have become part of our daily lives. At the same time, the Internet of Things is striving to exceed previous expectations regarding the number of devices. Furthermore, the proliferation of video games, virtual reality applications, and 360° video applications is increasing. All this leads to specific but different requirements from applications to frameworks, service platforms, and networks. For each service, users desire special service criteria, such as smooth interactivity, fast downloads, high availability, or extensive content. Such requirements can usually be summarized under the term Quality of Experience, i.e., the overall satisfaction of a user with the system cur- rently in use. In the age of big data and dynamic networks, Quality of Experience is still looking for its place, and good solutions are in high demand. This Special Issue addresses the latest advances and challenges in analysis, design, modeling, measurement, and performance evaluation of Quality of Experience and Quality of Experience-oriented metrics and management.
@article{info3-article-2020-1, abstract = {The heterogeneity and variability of Internet applications has increased considerably in recent years. Applications such as video streaming are responsible for a large part of data traffic on the Internet. Internet telephony and video conferencing systems have become part of our daily lives. At the same time, the Internet of Things is striving to exceed previous expectations regarding the number of devices. Furthermore, the proliferation of video games, virtual reality applications, and 360° video applications is increasing. All this leads to specific but different requirements from applications to frameworks, service platforms, and networks. For each service, users desire special service criteria, such as smooth interactivity, fast downloads, high availability, or extensive content. Such requirements can usually be summarized under the term Quality of Experience, i.e., the overall satisfaction of a user with the system cur- rently in use. In the age of big data and dynamic networks, Quality of Experience is still looking for its place, and good solutions are in high demand. This Special Issue addresses the latest advances and challenges in analysis, design, modeling, measurement, and performance evaluation of Quality of Experience and Quality of Experience-oriented metrics and management.}, author = {Wamser, Florian and Alay, Özgü and Metzger, Florian and Valentin, Stefan}, journal = {International Journal of Network Management}, keywords = {myown can}, month = 3, title = {IJNM Special Issue - Editorial - QoE-centric Analysis and Management of Communication Networks}, volume = {Special Issue: QoE-centric Analysis and Management of Communication Networks}, year = 2020 }
76.
Supervisor: Loh, F.: Studying the Live Streaming Behavior of Mobile Twitch.tv and YouTube, (2020).
[ Abstract ] [ BibTeX ]
 
Mit Hilfe eines vorhandenen Testbeds soll in der Arbeit YouTube und Twitch Live gemessen werden. Basierend auf den Messdaten ist die Frage zu beantworten, was der Unterschied zu On-Demand Streaming ist, wie das Video-Anfrageverhalten ist, sowie was die Unterschiede zwischen Twitch und YouTube Live Streaming sind.
@mastersthesis{info3-bachelor-2020-7, abstract = {Mit Hilfe eines vorhandenen Testbeds soll in der Arbeit YouTube und Twitch Live gemessen werden. Basierend auf den Messdaten ist die Frage zu beantworten, was der Unterschied zu On-Demand Streaming ist, wie das Video-Anfrageverhalten ist, sowie was die Unterschiede zwischen Twitch und YouTube Live Streaming sind.}, author = {Supervisor: Loh, Frank}, keywords = {myown}, school = {University of Würzburg}, title = {Studying the Live Streaming Behavior of Mobile Twitch.tv and YouTube}, year = 2020 }
77.
Furdek, M., Natalino, C., Lipp, F., Hock, D., Di Giglio, A., Schiano, M.: Machine Learning for Optical Network Security Monitoring: A Practical Perspective. Journal of Lightwave Technology. 38, 2860–2871 (2020).
[ BibTeX ] [ URL ] [ DOI ]
 
@article{furdek2020machine, author = {Furdek, Marija and Natalino, Carlos and Lipp, Fabian and Hock, David and Di Giglio, Andrea and Schiano, Marco}, journal = {Journal of Lightwave Technology}, keywords = {myown}, number = 11, pages = {2860–2871}, publisher = {IEEE}, title = {Machine Learning for Optical Network Security Monitoring: A Practical Perspective}, volume = 38, year = 2020 }
78.
Firman, O., Felsner, S., Kindermann, P., Ravsky, A., Wolff, A., Zink, J.: The Complexity of Finding Tangles. In: Chaplick, S., Kindermann, P., und Wolff, A. (hrsg.) Proc. 36th European Workshop on Computational Geometry (EuroCG’20). S. 67:1–8 (2020).
[ BibTeX ]
 
@inproceedings{ffkrwz-cotf-EuroCG20, author = {Firman, Oksana and Felsner, Stefan and Kindermann, Philipp and Ravsky, Alexander and Wolff, Alexander and Zink, Johannes}, booktitle = {Proc. 36th European Workshop on Computational Geometry (EuroCG'20)}, editor = {Chaplick, Steven and Kindermann, Philipp and Wolff, Alexander}, keywords = {myown}, pages = {67:1–8}, title = {The Complexity of Finding Tangles}, year = 2020 }
79.
Hirth, M., Borchert, K., de Moor, K., Borst, V., Hoßfeld, T.: Personal Task Design Preferences of Crowdworkers. 12th International Conference on Quality of Multimedia Experience (QoMEX). , Athlone, Ireland (2020).
[ BibTeX ]
 
@inproceedings{info3-inproceedings-2020-5, address = {Athlone, Ireland}, author = {Hirth, Matthias and Borchert, Kathrin and de Moor, Katrien and Borst, Vanessa and Hoßfeld, Tobias}, booktitle = {12th International Conference on Quality of Multimedia Experience (QoMEX)}, keywords = {myown ua-net}, month = 5, title = {Personal Task Design Preferences of Crowdworkers}, year = 2020 }
80.
Wißmann, N., Mišiak, M., Fuhrmann, A., Latoschik, M.E.: Accelerated Stereo Rendering with Hybrid Reprojection-Based Rasterization and Adaptive Ray-Tracing. Proceedings of the 27th IEEE Virtual Reality conference (IEEE VR ’20) (2020).
[ Abstract ] [ BibTeX ] [ URL ]
 
Stereoscopic rendering is a prominent feature of virtual reality ap- plications to generate depth cues and to provide depth perception in the virtual world. However, straight-forward stereo rendering methods usually are expensive since they render the scene from two eye-points which in general doubles the frame times. This is particularly problematic since virtual reality sets high requirements for real-time capabilities and image resolution. Hence, this paper presents a hybrid rendering system that combines classic rasteriza- tion and real-time ray-tracing to accelerate stereoscopic rendering. The system reprojects the pre-rendered left half of the stereo image pair into the right perspective using a forward grid warping technique and identifies resulting reprojection errors, which are then efficiently resolved by adaptive real-time ray-tracing. A final analysis shows that the system achieves a significant performance gain, has a neg- ligible quality impact, and is suitable even for higher rendering resolutions.
@inproceedings{wissmann2020accelerated, abstract = {Stereoscopic rendering is a prominent feature of virtual reality ap- plications to generate depth cues and to provide depth perception in the virtual world. However, straight-forward stereo rendering methods usually are expensive since they render the scene from two eye-points which in general doubles the frame times. This is particularly problematic since virtual reality sets high requirements for real-time capabilities and image resolution. Hence, this paper presents a hybrid rendering system that combines classic rasteriza- tion and real-time ray-tracing to accelerate stereoscopic rendering. The system reprojects the pre-rendered left half of the stereo image pair into the right perspective using a forward grid warping technique and identifies resulting reprojection errors, which are then efficiently resolved by adaptive real-time ray-tracing. A final analysis shows that the system achieves a significant performance gain, has a neg- ligible quality impact, and is suitable even for higher rendering resolutions.}, author = {Wißmann, Niko and Mišiak, Martin and Fuhrmann, Arnulph and Latoschik, Marc Erich}, booktitle = {Proceedings of the 27th IEEE Virtual Reality conference (IEEE VR '20)}, keywords = {myown}, note = {Best paper award 🏆}, title = {Accelerated Stereo Rendering with Hybrid Reprojection-Based Rasterization and Adaptive Ray-Tracing}, year = 2020 }
81.
Hoßfeld, T., Wunderer, S., Beyer, A., Hall, A., Schwind, A., Gassner, C., Guillemin, F., Wamser, F., Wascinski, K., Hirth, M., Seufert, M., Casas, P., Tran-Gia, P., Robitza, W., Wascinski, W., Ben Houidi, Z.: White Paper on Crowdsourced Network and QoE Measurements – Definitions, Use Cases and Challenges. Würzburg (2020).
[ Abstract ] [ BibTeX ]
 
The goal of the white paper at hand is as follows. The definitions of the terms build a framework for discussions around the hype topic ‘crowdsourcing’. This serves as a basis for differentiation and a consistent view from different perspectives on crowdsourced network measurements, with the goal to provide a commonly accepted definition in the community. The focus is on the context of mobile and fixed network operators, but also on measurements of different layers (network, application, user layer). In addition, the white paper shows the value of crowdsourcing for selected use cases, e.g., to improve QoE or regulatory issues. Finally, the major challenges and issues for researchers and practitioners are highlighted. This white paper is the outcome of the Würzburg seminar on “Crowdsourced Network and QoE Measurements” which took place from 25-26 September 2019 in Würzburg, Germany. International experts were invited from industry and academia. They are well known in their communities, having different backgrounds in crowdsourcing, mobile networks, network measurements, network performance, Quality of Service (QoS), and Quality of Experience (QoE). The discussions in the seminar focused on how crowdsourcing will support vendors, operators, and regulators to determine the Quality of Experience in new 5G networks that enable various new applications and network architectures. As a result of the discussions, the need for a white paper manifested, with the goal of providing a scientific discussion of the terms “crowdsourced network measurements” and “crowdsourced QoE measurements”, describing relevant use cases for such crowdsourced data, and its underlying challenges. During the seminar, those main topics were identified, intensively discussed in break-out groups, and brought back into the plenum several times. The outcome of the seminar is this white paper at hand which is – to our knowledge – the first one covering the topic of crowdsourced network and QoE measurements.
@techreport{info3-misc-2020-1, abstract = {The goal of the white paper at hand is as follows. The definitions of the terms build a framework for discussions around the hype topic ‘crowdsourcing’. This serves as a basis for differentiation and a consistent view from different perspectives on crowdsourced network measurements, with the goal to provide a commonly accepted definition in the community. The focus is on the context of mobile and fixed network operators, but also on measurements of different layers (network, application, user layer). In addition, the white paper shows the value of crowdsourcing for selected use cases, e.g., to improve QoE or regulatory issues. Finally, the major challenges and issues for researchers and practitioners are highlighted. This white paper is the outcome of the Würzburg seminar on “Crowdsourced Network and QoE Measurements” which took place from 25-26 September 2019 in Würzburg, Germany. International experts were invited from industry and academia. They are well known in their communities, having different backgrounds in crowdsourcing, mobile networks, network measurements, network performance, Quality of Service (QoS), and Quality of Experience (QoE). The discussions in the seminar focused on how crowdsourcing will support vendors, operators, and regulators to determine the Quality of Experience in new 5G networks that enable various new applications and network architectures. As a result of the discussions, the need for a white paper manifested, with the goal of providing a scientific discussion of the terms “crowdsourced network measurements” and “crowdsourced QoE measurements”, describing relevant use cases for such crowdsourced data, and its underlying challenges. During the seminar, those main topics were identified, intensively discussed in break-out groups, and brought back into the plenum several times. The outcome of the seminar is this white paper at hand which is – to our knowledge – the first one covering the topic of crowdsourced network and QoE measurements.}, author = {Hoßfeld, Tobias and Wunderer, Stefan and Beyer, André and Hall, Andrew and Schwind, Anika and Gassner, Christian and Guillemin, Fabrice and Wamser, Florian and Wascinski, Krzysztof and Hirth, Matthias and Seufert, Michael and Casas, Pedro and Tran-Gia, Phuoc and Robitza, Werner and Wascinski, Wojciech and Ben Houidi, Zied}, institution = {Würzburg}, keywords = {myown net-man ua-net}, month = 3, number = {10.25972/OPUS-20232}, title = {White Paper on Crowdsourced Network and QoE Measurements – Definitions, Use Cases and Challenges}, year = 2020 }
82.
Hoßfeld, T., Heegaard, P.E., Varela, M., Skorin-Kapov, L., Fiedler, M.: From QoS Distributions to QoE Distributions: a System’s Perspective. 4th International Workshop on Quality of Experience Management (QoE Management 2020), featured by IEEE Conference on Network Softwarization (IEEE NetSoft 2020). , Ghent, Belgium (2020).
[ Abstract ] [ BibTeX ]
 
In the context of QoE management, network and service providers commonly rely on models that map system QoS conditions (e.g., system response time, packet loss, etc.) to estimated end user QoE values. Observable QoS conditions in the system may be assumed to follow a certain distribution, meaning that different end users will experience different conditions. On the other hand, drawing from the results of subjective user studies, we know that user diversity leads to distributions of user scores for any given test conditions (in this case referring to the QoS parameters of interest). Our previous studies have shown that to correctly derive various QoE metrics (e.g., Mean Opinion Score (MOS), quantiles, probability of users rating 'good or better', etc.) in a system under given conditions, there is a need to consider rating distributions obtained from user studies, which are often times not available. In the paper we extend these findings to show how to approximate user rating distributions given a QoS-to-MOS mapping function and second order statistics. Such a user rating distribution may then be combined with a QoS distribution observed in a system to finally derive corresponding distributions of QoE scores. Scripts are provided for the approximating a QoE distribution with a Beta distribution for given MOS and SOS parameter at https://github.com/hossfeld/approx-qoe-distribution.
@inproceedings{info3-inproceedings-2020-6, abstract = {In the context of QoE management, network and service providers commonly rely on models that map system QoS conditions (e.g., system response time, packet loss, etc.) to estimated end user QoE values. Observable QoS conditions in the system may be assumed to follow a certain distribution, meaning that different end users will experience different conditions. On the other hand, drawing from the results of subjective user studies, we know that user diversity leads to distributions of user scores for any given test conditions (in this case referring to the QoS parameters of interest). Our previous studies have shown that to correctly derive various QoE metrics (e.g., Mean Opinion Score (MOS), quantiles, probability of users rating 'good or better', etc.) in a system under given conditions, there is a need to consider rating distributions obtained from user studies, which are often times not available. In the paper we extend these findings to show how to approximate user rating distributions given a QoS-to-MOS mapping function and second order statistics. Such a user rating distribution may then be combined with a QoS distribution observed in a system to finally derive corresponding distributions of QoE scores. Scripts are provided for the approximating a QoE distribution with a Beta distribution for given MOS and SOS parameter at https://github.com/hossfeld/approx-qoe-distribution.}, address = {Ghent, Belgium}, author = {Hoßfeld, Tobias and Heegaard, Poul E. and Varela, Martin and Skorin-Kapov, Lea and Fiedler, Markus}, booktitle = {4th International Workshop on Quality of Experience Management (QoE Management 2020), featured by IEEE Conference on Network Softwarization (IEEE NetSoft 2020)}, keywords = {myown}, month = 7, title = {From QoS Distributions to QoE Distributions: a System's Perspective}, year = 2020 }
83.
Wassermann, S., Casas, P., Seufert, M., Wehner, N., Schüler, J., Hoßfeld, T.: How Good is your Mobile (Web) Surfing? SpeedIndex Inference from Encrypted Traffic, (2020).
[ Abstract ] [ BibTeX ]
 
We address the problem ofWeb QoE monitoring, in particular Speed Index (SI), from the Internet Service Provider (ISP) perspective, relying on in-network, passive measurements. Given the wide adoption of end-to-end encryption, we resort to machine-learning models to infer the SI of individual web-page loading sessions, using as input only packet-level data. Our study targets the analysis of SI in mobile devices, including smartphones and tablets. To the best of our knowledge, this is the first paper addressing the inference of SI from encrypted network traffic in mobile devices.
@misc{info3-poster-2020-1, abstract = {We address the problem ofWeb QoE monitoring, in particular Speed Index (SI), from the Internet Service Provider (ISP) perspective, relying on in-network, passive measurements. Given the wide adoption of end-to-end encryption, we resort to machine-learning models to infer the SI of individual web-page loading sessions, using as input only packet-level data. Our study targets the analysis of SI in mobile devices, including smartphones and tablets. To the best of our knowledge, this is the first paper addressing the inference of SI from encrypted network traffic in mobile devices.}, address = {New York City, NY, USA}, author = {Wassermann, Sarah and Casas, Pedro and Seufert, Michael and Wehner, Nikolas and Schüler, Joshua and Hoßfeld, Tobias}, booktitle = {ACM Special Interest Group on Data Communication Conference (SIGCOMM)}, keywords = {myown ucn}, month = 8, title = {How Good is your Mobile (Web) Surfing? SpeedIndex Inference from Encrypted Traffic}, year = 2020 }
84.
Plesker, F.: Simulation of a 5G Network Infrastructure, (2020).
[ BibTeX ]
 
@mastersthesis{info3-master-2020-1, author = {Plesker, Florian}, keywords = {myown 5cale 5mart fia abschlussarbeit}, month = 4, school = {University of Würzburg}, title = {Simulation of a 5G Network Infrastructure}, year = 2020 }
85.
Schlör, D., Zehe, A., Kobs, K., Veseli, B., Westermeier, F., Brübach, L., Roth, D., Latoschik, M.E., Hotho, A.: Improving Sentiment Analysis with Biofeedback Data. Proceedings of the Workshop on peOple in laNguage, vIsiOn and the miNd (ONION) (2020).
[ Abstract ] [ BibTeX ] [ URL ]
 
Humans frequently are able to read and interpret emotions of others by directly taking verbal and non-verbal signals in human-to-human communication into account or to infer or even experience emotions from mediated stories. For computers, however, emotion recognition is a complex problem: Thoughts and feelings are the roots of many behavioural responses and they are deeply entangled with neurophysiological changes within humans. As such, emotions are very subjective, often are expressed in a subtle manner, and are highly depending on context. For example, machine learning approaches for text-based sentiment analysis often rely on incorporating sentiment lexicons or language models to capture the contextual meaning. This paper explores if and how we further can enhance sentiment analysis using biofeedback of humans which are experiencing emotions while reading texts. Specifically, we record the heart rate and brain waves of readers that are presented with short texts which have been annotated with the emotions they induce. We use these physiological signals to improve the performance of a lexicon-based sentiment classifier. We find that the combination of several biosignals can improve the ability of a text-based classifier to detect the presence of a sentiment in a text on a per-sentence level.
@inproceedings{schlor2020improving, abstract = {Humans frequently are able to read and interpret emotions of others by directly taking verbal and non-verbal signals in human-to-human communication into account or to infer or even experience emotions from mediated stories. For computers, however, emotion recognition is a complex problem: Thoughts and feelings are the roots of many behavioural responses and they are deeply entangled with neurophysiological changes within humans. As such, emotions are very subjective, often are expressed in a subtle manner, and are highly depending on context. For example, machine learning approaches for text-based sentiment analysis often rely on incorporating sentiment lexicons or language models to capture the contextual meaning. This paper explores if and how we further can enhance sentiment analysis using biofeedback of humans which are experiencing emotions while reading texts. Specifically, we record the heart rate and brain waves of readers that are presented with short texts which have been annotated with the emotions they induce. We use these physiological signals to improve the performance of a lexicon-based sentiment classifier. We find that the combination of several biosignals can improve the ability of a text-based classifier to detect the presence of a sentiment in a text on a per-sentence level.}, author = {Schlör, Daniel and Zehe, Albin and Kobs, Konstantin and Veseli, Blerta and Westermeier, Franziska and Brübach, Larissa and Roth, Daniel and Latoschik, Marc Erich and Hotho, Andreas}, booktitle = {Proceedings of the Workshop on peOple in laNguage, vIsiOn and the miNd (ONION)}, keywords = {myown}, title = {Improving Sentiment Analysis with Biofeedback Data}, year = 2020 }
86.
Mal, D.: [DC] The Impact of Social Interactions on an Embodied Individual’s Self-perception in Virtual Environments. 2020 IEEE Conference on Virtual Reality and 3D User Interfaces Abstracts and Workshops (VRW). S. 545–546. IEEE, Atlanta, GA, USA, USA (2020).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
In shared immersive virtual reality, users can interact with other participants and experience them as being present in the environment. Thereby different aspects of the respective interaction partners can have an impact on the perceived quality of the communication and possibly also the self-perception of an embodied user. This paper describes various factors the author aims to investigate during his doctoral studies. As the research area of embodied social interactions is broad, relevant factors and concrete research questions have been identified to investigate how social contact with one or multiple other persons may affect one’s self-perception, behavior and her or his relationship with the others while being embodied in a virtual environment.
@conference{mal2020impact, abstract = {In shared immersive virtual reality, users can interact with other participants and experience them as being present in the environment. Thereby different aspects of the respective interaction partners can have an impact on the perceived quality of the communication and possibly also the self-perception of an embodied user. This paper describes various factors the author aims to investigate during his doctoral studies. As the research area of embodied social interactions is broad, relevant factors and concrete research questions have been identified to investigate how social contact with one or multiple other persons may affect one’s self-perception, behavior and her or his relationship with the others while being embodied in a virtual environment.}, address = {Atlanta, GA, USA, USA}, author = {Mal, David}, booktitle = {2020 IEEE Conference on Virtual Reality and 3D User Interfaces Abstracts and Workshops (VRW)}, keywords = {ieee2020 myown vitras}, pages = {545-546}, publisher = {IEEE}, title = {[DC] The Impact of Social Interactions on an Embodied Individual’s Self-perception in Virtual Environments}, year = 2020 }
87.
Ripka, G., Tiede, J., Grafe, S., Latoschik, M.E.: Teaching and Learning Processes in Immersive VR – Comparing Expectations of Preservice Teachers and Teacher Educators. Society for Information Technology & Teacher Education (SITE) International Conference (2020).
[ Abstract ] [ BibTeX ] [ URL ]
 
The usage of VR in higher education is not uncommon anymore. However, concepts are mainly still focusing on technical rather than pedagogical aspects of VR in the classroom. The exploration of the expectations of teacher educators as well as of preservice teachers appears indispensable (1) to achieve a sound understanding of requirements, (2) to identify potential design spaces, and finally (3) to create and to derive suitable pedagogical approaches for VR in initial teacher education. This paper presents results of guideline-based qualitative interviews comparing the expectations of teacher educators and of preservice teachers regarding teaching and learning in immersive virtual learning environments. The results showed that preservice teachers and teacher educators expect VR to enrich classes through interactive engagement in situations that would otherwise be too costly or dangerous. Regarding the design, teacher educators put the emphasis on functionality. Student teachers emphasized that they do not want to miss social interactions with their peers. Furthermore, both groups stated preferred modes of collaboration and interaction taking into account the characteristics of a virtual learning surrounding such as being able to use diverse learning spaces for group work. Interviewees agreed on two vital factors for effective learning and teaching processes: flexibility and the possibility of customization considering technical properties that are to deal with. Apart from this, preservice teachers emphasized strongly their worries about data usage and the ethics regarding using avatars and agents for representation.
@inproceedings{ripka2020teaching, abstract = {The usage of VR in higher education is not uncommon anymore. However, concepts are mainly still focusing on technical rather than pedagogical aspects of VR in the classroom. The exploration of the expectations of teacher educators as well as of preservice teachers appears indispensable (1) to achieve a sound understanding of requirements, (2) to identify potential design spaces, and finally (3) to create and to derive suitable pedagogical approaches for VR in initial teacher education. This paper presents results of guideline-based qualitative interviews comparing the expectations of teacher educators and of preservice teachers regarding teaching and learning in immersive virtual learning environments. The results showed that preservice teachers and teacher educators expect VR to enrich classes through interactive engagement in situations that would otherwise be too costly or dangerous. Regarding the design, teacher educators put the emphasis on functionality. Student teachers emphasized that they do not want to miss social interactions with their peers. Furthermore, both groups stated preferred modes of collaboration and interaction taking into account the characteristics of a virtual learning surrounding such as being able to use diverse learning spaces for group work. Interviewees agreed on two vital factors for effective learning and teaching processes: flexibility and the possibility of customization considering technical properties that are to deal with. Apart from this, preservice teachers emphasized strongly their worries about data usage and the ethics regarding using avatars and agents for representation.}, author = {Ripka, Gabriela and Tiede, Jennifer and Grafe, Silke and Latoschik, Marc Erich}, booktitle = {Society for Information Technology & Teacher Education (SITE) International Conference}, keywords = {myown}, title = {Teaching and Learning Processes in Immersive VR – Comparing Expectations of Preservice Teachers and Teacher Educators}, year = 2020 }
88.
Arseneva, E., Kleist, L., Klemz, B., Löffler, M., Schulz, A., Vogtenhuber, B., Wolff, A.: Representing Graphs by Polygons with Edge Contacts in 3D. In: Chaplick, S., Kindermann, P., und Wolff, A. (hrsg.) Proc. 36th European Workshop on Computational Geometry (EuroCG’20). S. 53:1–8 (2020).
[ BibTeX ]
 
@inproceedings{akklsvw-rgpec-EuroCG20, author = {Arseneva, Elena and Kleist, Linda and Klemz, Boris and L{ö}ffler, Maarten and Schulz, Andr{é} and Vogtenhuber, Birgit and Wolff, Alexander}, booktitle = {Proc. 36th European Workshop on Computational Geometry (EuroCG'20)}, editor = {Chaplick, Steven and Kindermann, Philipp and Wolff, Alexander}, keywords = {myown}, pages = {53:1–8}, title = {Representing Graphs by Polygons with Edge Contacts in {3D}}, year = 2020 }
89.
Spoerhase, J., Storandt, S., Zink, J.: Simplification of Polyline Bundles. Proc. 17th Scandinavian Symposium and Workshops on Algorithm Theory (SWAT’20) (2020).
[ BibTeX ]
 
@inproceedings{spoerhase2020simplification, author = {Spoerhase, Joachim and Storandt, Sabine and Zink, Johannes}, booktitle = {Proc. 17th Scandinavian Symposium and Workshops on Algorithm Theory (SWAT'20)}, keywords = {approximability bundle covering geometry myown polyline simplification}, title = {Simplification of Polyline Bundles}, year = 2020 }
90.
von der Pütten, A.M.R., Lugrin, B., Steinhaeusser, S.C., Klass, L.: Context Matters! Identifying Social Context Factors and Assessing Their Relevance for a Socially Assistive Robot. Companion of the 2020 International Conference on Human-Robot Interaction. S. 409–411. ACM (2020).
[ BibTeX ] [ URL ] [ DOI ]
 
@inproceedings{Rosenthal_von_der_P_tten_2020, author = {von der Pütten, Astrid Marieke Rosenthal and Lugrin, Birgit and Steinhaeusser, Sophia C. and Klass, Lina}, booktitle = {Companion of the 2020 International Conference on Human-Robot Interaction}, keywords = {MI birgit myown reflectedreality steinhaeusser storyteller}, pages = {409-411}, publisher = {ACM}, title = {Context Matters! Identifying Social Context Factors and Assessing Their Relevance for a Socially Assistive Robot}, year = 2020 }
91.
Wehner, N., Seufert, M., Egger-Lampl, S., Gardlo, B., Casas, P., Schatz, R.: Scoring High: Analysis and Prediction of Viewer Behavior and Engagement in the Context of 2018 FIFA WC Live Streaming. Proceedings of the 28th ACM International Conference on Multimedia (MM). , Seattle, WA, USA (2020).
[ BibTeX ]
 
@inproceedings{info3-inproceedings-2020-9, address = {Seattle, WA, USA}, author = {Wehner, Nikolas and Seufert, Michael and Egger-Lampl, Sebastian and Gardlo, Bruno and Casas, Pedro and Schatz, Raimund}, booktitle = {Proceedings of the 28th ACM International Conference on Multimedia (MM)}, keywords = {myown ucn}, month = 10, title = {Scoring High: Analysis and Prediction of Viewer Behavior and Engagement in the Context of 2018 FIFA WC Live Streaming}, year = 2020 }
92.
Wehner, N., Mertinat, N., Seufert, M., Hoßfeld, T.: Studying the Impact of the Content Selection Method on the Video QoE on Mobile Devices. 12th International Conference on Quality of Multimedia Experience (QoMEX). , Athlone, Ireland (2020).
[ Abstract ] [ BibTeX ]
 
When conducting video QoE studies, participants are usually asked to rate the QoE of prepared test videos. However, participants are given no choice to select content, which they like or in which they are interested. This may cause annoyance or frustration when conducting the QoE study, which eventually might affect the QoE results of the study. The consequent question is whether the content liking has a direct impact on the submitted ratings by the participants and whether the freedom of choosing the video content in QoE studies results in better ratings. To investigate this research question, MCA, an existing framework for crowdsourced video testing, is extended and used in a pilot field study. MCA runs on mobile devices and allows users to watch the tested conditions of a QoE study within video content of their interest. The results of a QoE study with individual and dynamic content selection are compared to a QoE study with pre-selected contents. Moreover, this work includes a comparison to a previous QoE study for validation. As the previous study was conducted on desktop PCs, the MCA study further allows to identify differences in the stalling perception between studies on desktop PCs and mobile devices.
@inproceedings{info3-inproceedings-2020-8, abstract = {When conducting video QoE studies, participants are usually asked to rate the QoE of prepared test videos. However, participants are given no choice to select content, which they like or in which they are interested. This may cause annoyance or frustration when conducting the QoE study, which eventually might affect the QoE results of the study. The consequent question is whether the content liking has a direct impact on the submitted ratings by the participants and whether the freedom of choosing the video content in QoE studies results in better ratings. To investigate this research question, MCA, an existing framework for crowdsourced video testing, is extended and used in a pilot field study. MCA runs on mobile devices and allows users to watch the tested conditions of a QoE study within video content of their interest. The results of a QoE study with individual and dynamic content selection are compared to a QoE study with pre-selected contents. Moreover, this work includes a comparison to a previous QoE study for validation. As the previous study was conducted on desktop PCs, the MCA study further allows to identify differences in the stalling perception between studies on desktop PCs and mobile devices.}, address = {Athlone, Ireland}, author = {Wehner, Nikolas and Mertinat, Nils and Seufert, Michael and Hoßfeld, Tobias}, booktitle = {12th International Conference on Quality of Multimedia Experience (QoMEX)}, keywords = {myown ucn}, month = 5, title = {Studying the Impact of the Content Selection Method on the Video QoE on Mobile Devices}, year = 2020 }
93.
Donnermann, M., Schaper, P., Lugrin, B.: Integrating a Social Robot in Higher Education – A Field Study. 29th IEEE International Conference on Robot and Human Interactive Communication (RO-MAN 2020). S. 573–579 (2020).
[ BibTeX ]