Veröffentlichungen

2021 [ nach oben ]

1.
Unruh, F., Landeck, M., Oberdörfer, S., Lugrin, J.-L., Latoschik, M.E.: The Influence of Avatar Embodiment on Time Perception - Towards VR for Time-Based Therapy. Frontiers in Virtual Reality. 2, 71 (2021).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
Psycho-pathological conditions, such as depression or schizophrenia, are often accompanied by a distorted perception of time. People suffering from this conditions often report that the passage of time slows down considerably and that they are ``stuck in time.'' Virtual Reality (VR) could potentially help to diagnose and maybe treat such mental conditions. However, the conditions in which a VR simulation could correctly diagnose a time perception deviation are still unknown. In this paper, we present an experiment investigating the difference in time experience with and without a virtual body in VR, also known as avatar. The process of substituting a person's body with a virtual body is called avatar embodiment. Numerous studies demonstrated interesting perceptual, emotional, behavioral, and psychological effects caused by avatar embodiment. However, the relations between time perception and avatar embodiment are still unclear. Whether or not the presence or absence of an avatar is already influencing time perception is still open to question. Therefore, we conducted a between-subjects design with and without avatar embodiment as well as a real condition (avatar vs. no-avatar vs. real). A group of 105 healthy subjects had to wait for seven and a half minutes in a room without any distractors (e.g., no window, magazine, people, decoration) or time indicators (e.g., clocks, sunlight). The virtual environment replicates the real physical environment. Participants were unaware that they will be asked to estimate their waiting time duration as well as describing their experience of the passage of time at a later stage. Our main finding shows that the presence of an avatar is leading to a significantly faster perceived passage of time. It seems to be promising to integrate avatar embodiment in future VR time-based therapy applications as they potentially could modulate a user's perception of the passage of time. We also found no significant difference in time perception between the real and the VR conditions (avatar, no-avatar), but further research is needed to better understand this outcome.
@article{10.3389/frvir.2021.658509, abstract = {Psycho-pathological conditions, such as depression or schizophrenia, are often accompanied by a distorted perception of time. People suffering from this conditions often report that the passage of time slows down considerably and that they are ``stuck in time.'' Virtual Reality (VR) could potentially help to diagnose and maybe treat such mental conditions. However, the conditions in which a VR simulation could correctly diagnose a time perception deviation are still unknown. In this paper, we present an experiment investigating the difference in time experience with and without a virtual body in VR, also known as avatar. The process of substituting a person's body with a virtual body is called avatar embodiment. Numerous studies demonstrated interesting perceptual, emotional, behavioral, and psychological effects caused by avatar embodiment. However, the relations between time perception and avatar embodiment are still unclear. Whether or not the presence or absence of an avatar is already influencing time perception is still open to question. Therefore, we conducted a between-subjects design with and without avatar embodiment as well as a real condition (avatar vs. no-avatar vs. real). A group of 105 healthy subjects had to wait for seven and a half minutes in a room without any distractors (e.g., no window, magazine, people, decoration) or time indicators (e.g., clocks, sunlight). The virtual environment replicates the real physical environment. Participants were unaware that they will be asked to estimate their waiting time duration as well as describing their experience of the passage of time at a later stage. Our main finding shows that the presence of an avatar is leading to a significantly faster perceived passage of time. It seems to be promising to integrate avatar embodiment in future VR time-based therapy applications as they potentially could modulate a user's perception of the passage of time. We also found no significant difference in time perception between the real and the VR conditions (avatar, no-avatar), but further research is needed to better understand this outcome.}, author = {Unruh, Fabian and Landeck, Maximilian and Oberd{ö}rfer, Sebastian and Lugrin, Jean-Luc and Latoschik, Marc Erich}, journal = {Frontiers in Virtual Reality}, keywords = {hci-uwb myown}, pages = 71, title = {The Influence of Avatar Embodiment on Time Perception - Towards VR for Time-Based Therapy}, volume = 2, year = 2021 }
2.
Schüler, J.: Real-time Video QoE Estimation for Network Management based on Feature Calculation on a 100Gbps Programmable Data Plane, (2021).
[ BibTeX ]
 
@mastersthesis{info3-master-2021-6, author = {Schüler, Joshua}, keywords = {myown}, school = {University of Würzburg}, title = {Real-time Video QoE Estimation for Network Management based on Feature Calculation on a 100Gbps Programmable Data Plane}, year = 2021 }
3.
Supervisor: Wehner, N.: Evaluating the Interaction between Web and Video QoE with Crowdsourcing, (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-2021-14, 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 = {Supervisor: Wehner, Nikolas}, keywords = {myown ucn}, school = {University of Würzburg}, title = {Evaluating the Interaction between Web and Video QoE with Crowdsourcing}, year = 2021 }
4.
Oberdörfer, S., Birnstiel, S., Latoschik, M.E., Grafe, S.: Mutual Benefits: Interdisciplinary Education of Pre-Service Teachers and HCI Students in VR/AR Learning Environment Design. Frontiers in Education. 6, 233 (2021).
[ BibTeX ] [ URL ] [ DOI ]
 
@article{oberdorfer2021mutual, author = {Oberdörfer, Sebastian and Birnstiel, Sandra and Latoschik, Marc Erich and Grafe, Silke}, journal = {Frontiers in Education}, keywords = {myown oberdoerfer varyfast}, pages = 233, title = {Mutual Benefits: Interdisciplinary Education of Pre-Service Teachers and HCI Students in VR/AR Learning Environment Design}, volume = 6, year = 2021 }
5.
Loh, F., Poignée, F., Wamser, F., Leidinger, F., Hoßfeld, T.: Uplink vs. Downlink: Machine Learning-Based Quality Prediction for HTTP Adaptive Video Streaming. Sensors. 21, 4172 (2021).
[ Abstract ] [ BibTeX ]
 
Streaming video is responsible for the bulk of Internet traffic these days. For this reason, Internet providers and network operators try to make predictions and assessments about the streaming quality for an end user. Current monitoring solutions are based on a variety of different machine learning approaches. The challenge for providers and operators nowadays is that existing approaches require large amounts of data. In this work, the most relevant quality of experience metrics, i.e., the initial playback delay, the video streaming quality, video quality changes, and video rebuffering events, are examined using a voluminous data set of more than 13,000 YouTube video streaming runs that were collected with the native YouTube mobile app. Three Machine Learning models are developed and compared to estimate playback behavior based on uplink request information. The main focus has been on developing a lightweight approach using as few features and as little data as possible, while maintaining state-of-the-art performance.
@article{info3-article-2021-3, abstract = {Streaming video is responsible for the bulk of Internet traffic these days. For this reason, Internet providers and network operators try to make predictions and assessments about the streaming quality for an end user. Current monitoring solutions are based on a variety of different machine learning approaches. The challenge for providers and operators nowadays is that existing approaches require large amounts of data. In this work, the most relevant quality of experience metrics, i.e., the initial playback delay, the video streaming quality, video quality changes, and video rebuffering events, are examined using a voluminous data set of more than 13,000 YouTube video streaming runs that were collected with the native YouTube mobile app. Three Machine Learning models are developed and compared to estimate playback behavior based on uplink request information. The main focus has been on developing a lightweight approach using as few features and as little data as possible, while maintaining state-of-the-art performance.}, author = {Loh, Frank and Poignée, Fabian and Wamser, Florian and Leidinger, Ferdinand and Hoßfeld, Tobias}, journal = {Sensors}, keywords = {myown youtube can}, number = 12, pages = 4172, title = {Uplink vs. Downlink: Machine Learning-Based Quality Prediction for HTTP Adaptive Video Streaming}, volume = 21, year = 2021 }
6.
Oberdörfer, S., Elsässer, A., Grafe, S., Latoschik, M.E.: Grab the Frog: Comparing Intuitive Use and User Experience of a Smartphone-only, AR-only, and Tangible AR Learning Environment. Proceedings of the 23rd International Conference on Mobile Human-Computer Interaction (MobileHCI ’21). (2021).
[ BibTeX ] [ URL ] [ DOI ]
 
@article{oberdorfer2021comparing, author = {Oberdörfer, Sebastian and Elsässer, Anne and Grafe, Silke and Latoschik, Marc Erich}, journal = {Proceedings of the 23rd International Conference on Mobile Human-Computer Interaction (MobileHCI '21)}, keywords = {leed myown oberdoerfer}, month = {September}, title = {Grab the Frog: Comparing Intuitive Use and User Experience of a Smartphone-only, AR-only, and Tangible AR Learning Environment}, year = 2021 }
7.
Metzger, F., Stulier, N., Borchert, K., Hirth, M.: Relationship Status: It’s Complicated. Using APM as a QoE-qualifying Tempo Metric. Proceedings of the 13th International Conference on Quality of Multimedia Experience (QoMEX 2021) (2021).
[ BibTeX ]
 
@inproceedings{info3-inproceedings-2021-13, author = {Metzger, Florian and Stulier, Norman and Borchert, Kathrin and Hirth, Matthias}, booktitle = {Proceedings of the 13th International Conference on Quality of Multimedia Experience (QoMEX 2021)}, keywords = {myown}, month = 6, title = {Relationship Status: It's Complicated. Using APM as a QoE-qualifying Tempo Metric}, year = 2021 }
8.
Nguyen Huu, T., Trung Kien, N., Van Hoa, N., Thu Huong, T., Wamser, F., Hoßfeld, T.: Energy-Aware Service Function Chain Embedding in Edge-Cloud Environments for IoT Applications. IEEE Internet of Things Journal. (2021).
[ Abstract ] [ BibTeX ]
 
The implementation of IoT applications faces several challenges in practice, such as compliance with QoS requirements, resource constraints and energy consumption. In this context, the joint paradigm for IoT applications can resolve some of the issues arising in pure cloud computing scenarios, such as those related to latency, energy or privacy. Therefore, an environment could be promising for resource and energy-efficient IoT applications that implement VNF bound together into SFC. However, a resource and energy efficient SFC placement requires smart SFC embedding mechanisms in the environment, as several challenges arise, such as IoT service chain modeling and evaluation, the trade-off between resource allocation, energy efficiency and performance, and the resource dynamics. In this article, we address issues in modeling resource and energy utilization for IoT applications in environments. A smart traffic monitoring IP camera system is deployed as a use case for a realistic modeling of a service chain. The system is implemented in our testbed, which is designed and developed specifically to model and investigate the resource and energy utilization of SFC embedding strategies. A resource and energy-aware SFC strategy in the environment for IoT applications is then proposed. Our algorithm is able to cope with dynamic load and resource situations emerging from dynamic SFC requests. The strategy is evaluated systematically in terms of acceptance ratio of SFC requests, resource efficiency and utilization, power consumption, and VNF migrations depending on the offered system load. Results show that our strategy outperforms some existing approaches in terms of resource and energy efficiency, thus it overcomes the relevant challenges from practice and meets the demands of IoT applications.
@article{info3-article-2021-2, abstract = {The implementation of IoT applications faces several challenges in practice, such as compliance with QoS requirements, resource constraints and energy consumption. In this context, the joint paradigm for IoT applications can resolve some of the issues arising in pure cloud computing scenarios, such as those related to latency, energy or privacy. Therefore, an environment could be promising for resource and energy-efficient IoT applications that implement VNF bound together into SFC. However, a resource and energy efficient SFC placement requires smart SFC embedding mechanisms in the environment, as several challenges arise, such as IoT service chain modeling and evaluation, the trade-off between resource allocation, energy efficiency and performance, and the resource dynamics. In this article, we address issues in modeling resource and energy utilization for IoT applications in environments. A smart traffic monitoring IP camera system is deployed as a use case for a realistic modeling of a service chain. The system is implemented in our testbed, which is designed and developed specifically to model and investigate the resource and energy utilization of SFC embedding strategies. A resource and energy-aware SFC strategy in the environment for IoT applications is then proposed. Our algorithm is able to cope with dynamic load and resource situations emerging from dynamic SFC requests. The strategy is evaluated systematically in terms of acceptance ratio of SFC requests, resource efficiency and utilization, power consumption, and VNF migrations depending on the offered system load. Results show that our strategy outperforms some existing approaches in terms of resource and energy efficiency, thus it overcomes the relevant challenges from practice and meets the demands of IoT applications.}, author = {Nguyen Huu, Thanh and Trung Kien, Nguyen and Van Hoa, Ngo and Thu Huong, Truong and Wamser, Florian and Hoßfeld, Tobias}, journal = {IEEE Internet of Things Journal}, keywords = {myown ecodane}, month = 3, title = {Energy-Aware Service Function Chain Embedding in Edge-Cloud Environments for IoT Applications}, year = 2021 }
9.
Seufert, A., Wamser, F., Yarish, D., Macdonald, H., Hoßfeld, T.: QoE Models in the Wild: Comparing Video QoE Models Using a Crowdsourced Data Set. 2021 13th International Conference on Quality of Multimedia Experience (QoMEX). , Montreal, Canada (virtual conference) (2021).
[ Abstract ] [ BibTeX ]
 
Crowdsourced measurements solve the problem of being able to assess the performance of a communication network from an end-user perspective, but the new characteristics of the data pose new challenges for QoE modeling. In contrast to existing laboratory or network measurements, this type of measurement at the end-user device primarily involves taking a large number of short sample measurements, which, however, are rich in measured parameters, including many user-, application-, and device-related parameters. To test the applicability and to facilitate the integration of such data, we applied four QoE models from the literature to 290k worldwide video streaming measurements from a commercial data set from August to October 2020. In this work, we will therefore first describe the crowdsourcing video streaming data set to provide insights into the properties of video streaming KPIs in the real-world. Second, we run four popular QoE models using this data set, compare the resulting QoE scores, and derive the impact of individual KPIs for each model. We show that the models assess the QoE at least differently, but sometimes with contradicting statements. Reading this paper, it becomes evident that more work and subjective studies, based on real-world data like the one we have shown, are needed to extend the current QoE models.
@inproceedings{info3-inproceedings-2021-12, abstract = {Crowdsourced measurements solve the problem of being able to assess the performance of a communication network from an end-user perspective, but the new characteristics of the data pose new challenges for QoE modeling. In contrast to existing laboratory or network measurements, this type of measurement at the end-user device primarily involves taking a large number of short sample measurements, which, however, are rich in measured parameters, including many user-, application-, and device-related parameters. To test the applicability and to facilitate the integration of such data, we applied four QoE models from the literature to 290k worldwide video streaming measurements from a commercial data set from August to October 2020. In this work, we will therefore first describe the crowdsourcing video streaming data set to provide insights into the properties of video streaming KPIs in the real-world. Second, we run four popular QoE models using this data set, compare the resulting QoE scores, and derive the impact of individual KPIs for each model. We show that the models assess the QoE at least differently, but sometimes with contradicting statements. Reading this paper, it becomes evident that more work and subjective studies, based on real-world data like the one we have shown, are needed to extend the current QoE models.}, address = {Montreal, Canada (virtual conference)}, author = {Seufert, Anika and Wamser, Florian and Yarish, David and Macdonald, Hunter and Hoßfeld, Tobias}, booktitle = {2021 13th International Conference on Quality of Multimedia Experience (QoMEX)}, keywords = {myown tutela-video can}, month = 6, title = {QoE Models in the Wild: Comparing Video QoE Models Using a Crowdsourced Data Set}, year = 2021 }
10.
Seufert, A., Wamser, F., Wunderer, S., Hall, A., Hoßfeld, T.: Trust but Verify: Crowdsourced Mobile Network Measurements and Statistical Validity Measures. 2021 Joint European Conference on Networks and Communications & 6G Summit (EuCNC/6G Summit). , Porto, Portugal (virtual conference) (2021).
[ Abstract ] [ BibTeX ]
 
Network operators, regulators, and big data companies use crowdsourced measurements to study the performance of mobile networks on a large scale. Such a type of measurement is defined as the collection and processing of data measured by the crowd, here the crowd of mobile subscribers. Crowdsourced network measurements make it relatively easy and inexpensive to obtain large amounts of network data that also reflect the quality actually received by the end user. However, this measurement method also involves some uncertainties, since, for example, it is not possible to precisely control when, where and with which devices measurements are taken. Thus, there is a trade-off between the reliability of the individual measurement and the scope of the measurements. Therefore, how data of this type is analyzed is particularly important in order to obtain valid results. To address this issue, our paper defines concepts and guidelines for analyzing the validity of crowdsourced mobile network measurements. In particular, we address precision, for example the number of measurements needed to make valid statements, and also representativeness, for example the spatial and temporal distribution of the data. In addition to the formal definition of these two aspects, we illustrate the issue and possible evaluation approaches with the help of an extensive example data set. This data set consists of more than 11.7M crowdsourced mobile measurements from all over France, measured by a commercial mobile data provider. In the end, we provide an evaluation guideline and two possible use cases.
@inproceedings{info3-inproceedings-2021-11, abstract = {Network operators, regulators, and big data companies use crowdsourced measurements to study the performance of mobile networks on a large scale. Such a type of measurement is defined as the collection and processing of data measured by the crowd, here the crowd of mobile subscribers. Crowdsourced network measurements make it relatively easy and inexpensive to obtain large amounts of network data that also reflect the quality actually received by the end user. However, this measurement method also involves some uncertainties, since, for example, it is not possible to precisely control when, where and with which devices measurements are taken. Thus, there is a trade-off between the reliability of the individual measurement and the scope of the measurements. Therefore, how data of this type is analyzed is particularly important in order to obtain valid results. To address this issue, our paper defines concepts and guidelines for analyzing the validity of crowdsourced mobile network measurements. In particular, we address precision, for example the number of measurements needed to make valid statements, and also representativeness, for example the spatial and temporal distribution of the data. In addition to the formal definition of these two aspects, we illustrate the issue and possible evaluation approaches with the help of an extensive example data set. This data set consists of more than 11.7M crowdsourced mobile measurements from all over France, measured by a commercial mobile data provider. In the end, we provide an evaluation guideline and two possible use cases.}, address = {Porto, Portugal (virtual conference)}, author = {Seufert, Anika and Wamser, Florian and Wunderer, Stefan and Hall, Andrew and Hoßfeld, Tobias}, booktitle = {2021 Joint European Conference on Networks and Communications & 6G Summit (EuCNC/6G Summit)}, keywords = {myown 5gqmon can}, month = 6, title = {Trust but Verify: Crowdsourced Mobile Network Measurements and Statistical Validity Measures}, year = 2021 }
11.
Glémarec, Y., Lugrin, J.-L., Bosser, A.-G., Collins Jackson, A., Buche, C., Latoschik, M.E.: Indifferent or Enthusiastic? Virtual Audiences Animation and Perception in Virtual Reality. Frontiers in Virtual Reality. 2, 72 (2021).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
In this paper, we present a virtual audience simulation system for Virtual Reality (VR). The system implements an audience perception model controlling the nonverbal behaviors of virtual spectators, such as facial expressions or postures. Groups of virtual spectators are animated by a set of nonverbal behavior rules representing a particular audience attitude (e.g., indifferent or enthusiastic). Each rule specifies a nonverbal behavior category: posture, head movement, facial expression and gaze direction as well as three parameters: type, frequency and proportion. In a first user-study, we asked participants to pretend to be a speaker in VR and then create sets of nonverbal behaviour parameters to simulate different attitudes. Participants manipulated the nonverbal behaviours of single virtual spectator to match a specific levels of engagement and opinion toward them. In a second user-study, we used these parameters to design different types of virtual audiences with our nonverbal behavior rules and evaluated their perceptions. Our results demonstrate our system’s ability to create virtual audiences with three types of different perceived attitudes: indifferent, critical, enthusiastic. The analysis of the results also lead to a set of recommendations and guidelines regarding attitudes and expressions for future design of audiences for VR therapy and training applications.
@article{10.3389/frvir.2021.666232, abstract = {In this paper, we present a virtual audience simulation system for Virtual Reality (VR). The system implements an audience perception model controlling the nonverbal behaviors of virtual spectators, such as facial expressions or postures. Groups of virtual spectators are animated by a set of nonverbal behavior rules representing a particular audience attitude (e.g., indifferent or enthusiastic). Each rule specifies a nonverbal behavior category: posture, head movement, facial expression and gaze direction as well as three parameters: type, frequency and proportion. In a first user-study, we asked participants to pretend to be a speaker in VR and then create sets of nonverbal behaviour parameters to simulate different attitudes. Participants manipulated the nonverbal behaviours of single virtual spectator to match a specific levels of engagement and opinion toward them. In a second user-study, we used these parameters to design different types of virtual audiences with our nonverbal behavior rules and evaluated their perceptions. Our results demonstrate our system’s ability to create virtual audiences with three types of different perceived attitudes: indifferent, critical, enthusiastic. The analysis of the results also lead to a set of recommendations and guidelines regarding attitudes and expressions for future design of audiences for VR therapy and training applications.}, author = {Glémarec, Yann and Lugrin, Jean-Luc and Bosser, Anne-Gwenn and Collins Jackson, Aryana and Buche, Cédric and Latoschik, Marc Erich}, journal = {Frontiers in Virtual Reality}, keywords = {lugrin myown vraudi}, pages = 72, title = {Indifferent or Enthusiastic? Virtual Audiences Animation and Perception in Virtual Reality}, volume = 2, year = 2021 }
12.
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 }
13.
Döllinger, N., Wienrich, C., Latoschik, M.E.: Challenges and Opportunities of Immersive Technologies for Mindfulness Meditation: A Systematic Review. Frontiers in Virtual Reality. 2, 29 (2021).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
Mindfulness is considered an important factor of an individual's subjective well-being. Consequently, Human-Computer Interaction (HCI) has investigated approaches that strengthen mindfulness, i.e., by inventing multimedia technologies to support mindfulness meditation. These approaches often use smartphones, tablets, or consumer-grade desktop systems to allow everyday usage in users' private lives or in the scope of organized therapies. Virtual, Augmented, and Mixed Reality (VR, AR, MR; in short: XR) significantly extend the design space for such approaches. XR covers a wide range of potential sensory stimulation, perceptive and cognitive manipulations, content presentation, interaction, and agency. These facilities are linked to typical XR-specific perceptions that are conceptually closely related to mindfulness research, such as (virtual) presence and (virtual) embodiment. However, a successful exploitation of XR that strengthens mindfulness requires a systematic analysis of the potential interrelation and influencing mechanisms between XR technology, its properties, factors, and phenomena and existing models and theories of the construct of mindfulness. This article reports such a systematic analysis of XR-related research from HCI and life sciences to determine the extent to which existing research frameworks on HCI and mindfulness can be applied to XR technologies, the potential of XR technologies to support mindfulness, and open research gaps. Fifty papers of ACM Digital Library and National Institutes of Health's National Library of Medicine (PubMed) with and without empirical efficacy evaluation were included in our analysis. The results reveal that at the current time, empirical research on XR-based mindfulness support mainly focuses on therapy and therapeutic outcomes. Furthermore, most of the currently investigated XR-supported mindfulness interactions are limited to vocally guided meditations within nature-inspired virtual environments. While an analysis of empirical research on those systems did not reveal differences in mindfulness compared to non-mediated mindfulness practices, various design proposals illustrate that XR has the potential to provide interactive and body-based innovations for mindfulness practice. We propose a structured approach for future work to specify and further explore the potential of XR as mindfulness-support. The resulting framework provides design guidelines for XR-based mindfulness support based on the elements and psychological mechanisms of XR interactions.
@article{10.3389/frvir.2021.644683, abstract = {Mindfulness is considered an important factor of an individual's subjective well-being. Consequently, Human-Computer Interaction (HCI) has investigated approaches that strengthen mindfulness, i.e., by inventing multimedia technologies to support mindfulness meditation. These approaches often use smartphones, tablets, or consumer-grade desktop systems to allow everyday usage in users' private lives or in the scope of organized therapies. Virtual, Augmented, and Mixed Reality (VR, AR, MR; in short: XR) significantly extend the design space for such approaches. XR covers a wide range of potential sensory stimulation, perceptive and cognitive manipulations, content presentation, interaction, and agency. These facilities are linked to typical XR-specific perceptions that are conceptually closely related to mindfulness research, such as (virtual) presence and (virtual) embodiment. However, a successful exploitation of XR that strengthens mindfulness requires a systematic analysis of the potential interrelation and influencing mechanisms between XR technology, its properties, factors, and phenomena and existing models and theories of the construct of mindfulness. This article reports such a systematic analysis of XR-related research from HCI and life sciences to determine the extent to which existing research frameworks on HCI and mindfulness can be applied to XR technologies, the potential of XR technologies to support mindfulness, and open research gaps. Fifty papers of ACM Digital Library and National Institutes of Health's National Library of Medicine (PubMed) with and without empirical efficacy evaluation were included in our analysis. The results reveal that at the current time, empirical research on XR-based mindfulness support mainly focuses on therapy and therapeutic outcomes. Furthermore, most of the currently investigated XR-supported mindfulness interactions are limited to vocally guided meditations within nature-inspired virtual environments. While an analysis of empirical research on those systems did not reveal differences in mindfulness compared to non-mediated mindfulness practices, various design proposals illustrate that XR has the potential to provide interactive and body-based innovations for mindfulness practice. We propose a structured approach for future work to specify and further explore the potential of XR as mindfulness-support. The resulting framework provides design guidelines for XR-based mindfulness support based on the elements and psychological mechanisms of XR interactions.}, author = {Döllinger, Nina and Wienrich, Carolin and Latoschik, Marc Erich}, journal = {Frontiers in Virtual Reality}, keywords = {myown}, pages = 29, title = {Challenges and Opportunities of Immersive Technologies for Mindfulness Meditation: A Systematic Review}, volume = 2, year = 2021 }
14.
Orsolic, I., Seufert, M.: On Machine Learning based Video QoE Estimation Across Different Networks. 16th International Conference on Telecommunications (ConTEL), Best Paper Award. , Zagreb, Croatia (Virtual Conference) (2021).
[ BibTeX ]
 
@inproceedings{info3-inproceedings-2021-10, address = {Zagreb, Croatia (Virtual Conference)}, author = {Orsolic, Irena and Seufert, Michael}, booktitle = {16th International Conference on Telecommunications (ConTEL), Best Paper Award}, keywords = {myown ucn}, month = 7, title = {On Machine Learning based Video QoE Estimation Across Different Networks}, year = 2021 }
15.
Gray, N., Dietz, K., Seufert, M., Hoßfeld, T.: High Performance Network Metadata Extraction Using P4 for ML-Based Intrusion Detection Systems. 22nd International Conference on High Performance Switching and Routing (HPSR). , Paris, France (Virtual Conference) (2021).
[ BibTeX ]
 
@inproceedings{info3-inproceedings-2021-8, address = {Paris, France (Virtual Conference)}, author = {Gray, Nicholas and Dietz, Katharina and Seufert, Michael and Hoßfeld, Tobias}, booktitle = {22nd International Conference on High Performance Switching and Routing (HPSR)}, keywords = {myown wintermute ucn}, month = 6, title = {High Performance Network Metadata Extraction Using P4 for ML-Based Intrusion Detection Systems}, year = 2021 }
16.
Tran, H.T., Pham Ngoc, N., Hoßfeld, T., Seufert, M., Thang, T.C.: Cumulative Quality Modeling for HTTP Adaptive Streaming. ACM Transactions on Multimedia Computing, Communications, and Applications. 17, 22 (1–24) (2021).
[ BibTeX ]
 
@article{info3-article-2021-1, author = {Tran, Huyen TT and Pham Ngoc, Nam and Hoßfeld, Tobias and Seufert, Michael and Thang, Truong Cong}, journal = {ACM Transactions on Multimedia Computing, Communications, and Applications}, keywords = {myown ucn}, month = 4, number = 1, pages = {22 (1-24)}, title = {Cumulative Quality Modeling for HTTP Adaptive Streaming}, volume = 17, year = 2021 }
17.
Grigorjew, A., Gray, N., Hoßfeld, T.: Dynamic Real-Time Stream Reservation with TAS and Shared Time Windows. 2nd International Workshop on Time-Sensitive and Deterministic Networking (TENSOR) (2021).
[ Abstract ] [ BibTeX ]
 
Motivated by new use cases such as industrial automation and in-vehicle communication, Time-Sensitive Networking is further improving the layer~2 standards for real-time communication in Ethernet networks. As periodic traffic is a common requirement in such scenarios, the Time Aware Shaper (TAS) is a highly popular mechanism that allows the realization of real-time guarantees in synchronized networks. Most applications in literature suggest to configure the TAS for full stream isolation such that the lowest delays can be achieved. However, this ``zero-queuing'' strategy requires a high amount of computational resources and time, as the configuration of the gate control lists of each port is a complex task, which is not suitable for scenarios with dynamically changing requirements. This paper presents a novel approach with shared time windows. In combination with stream reservation techniques that are commonly applied for asynchronous mechanisms, the network is able to accept new streams during operation without complex reconfiguration, while still benefiting from some degree of isolation compared to conventional asynchronous shapers. The evaluation shows that, given the right circumstances, the number of accepted real-time streams can be improved significantly.
@inproceedings{info3-inproceedings-2021-7, abstract = {Motivated by new use cases such as industrial automation and in-vehicle communication, Time-Sensitive Networking is further improving the layer 2 standards for real-time communication in Ethernet networks. As periodic traffic is a common requirement in such scenarios, the Time Aware Shaper (TAS) is a highly popular mechanism that allows the realization of real-time guarantees in synchronized networks. Most applications in literature suggest to configure the TAS for full stream isolation such that the lowest delays can be achieved. However, this ``zero-queuing'' strategy requires a high amount of computational resources and time, as the configuration of the gate control lists of each port is a complex task, which is not suitable for scenarios with dynamically changing requirements. This paper presents a novel approach with shared time windows. In combination with stream reservation techniques that are commonly applied for asynchronous mechanisms, the network is able to accept new streams during operation without complex reconfiguration, while still benefiting from some degree of isolation compared to conventional asynchronous shapers. The evaluation shows that, given the right circumstances, the number of accepted real-time streams can be improved significantly.}, author = {Grigorjew, Alexej and Gray, Nicholas and Hoßfeld, Tobias}, booktitle = {2nd International Workshop on Time-Sensitive and Deterministic Networking (TENSOR)}, keywords = {myown intedis ngn}, month = 6, title = {Dynamic Real-Time Stream Reservation with TAS and Shared Time Windows}, year = 2021 }
18.
Grigorjew, A., Baier, C., Metzger, F., Hoßfeld, T.: Distributed Implementation of Deterministic Networking in Existing Non-TSN Ethernet Switches. Workshop on Time-sensitive and Deterministic Networking (TsDN) (2021).
[ Abstract ] [ BibTeX ]
 
Deterministic networking is quickly gaining importance, as several domains previously dominated by bus systems are now switching to Ethernet. While standardization efforts, especially from the Time-Sensitive Networking (TSN) group, are ongoing, practical deployments are still far off until configuration guidelines and resource management are able to use these tools to their full potential. As an alternative, this work presents a working implementation of bounded latency with an off-the-shelf non-TSN Ethernet switch. The solution is based on a distributed reservation protocol and admission control. It proves that bounded latency is already possible with simple priority-based transmission, and it provides valuable insights for the development and operation of future real-time networking solutions.
@inproceedings{info3-inproceedings-2021-6, abstract = {Deterministic networking is quickly gaining importance, as several domains previously dominated by bus systems are now switching to Ethernet. While standardization efforts, especially from the Time-Sensitive Networking (TSN) group, are ongoing, practical deployments are still far off until configuration guidelines and resource management are able to use these tools to their full potential. As an alternative, this work presents a working implementation of bounded latency with an off-the-shelf non-TSN Ethernet switch. The solution is based on a distributed reservation protocol and admission control. It proves that bounded latency is already possible with simple priority-based transmission, and it provides valuable insights for the development and operation of future real-time networking solutions.}, author = {Grigorjew, Alexej and Baier, Christian and Metzger, Florian and Hoßfeld, Tobias}, booktitle = {Workshop on Time-sensitive and Deterministic Networking (TsDN)}, keywords = {myown ats-performance ngn}, month = 6, title = {Distributed Implementation of Deterministic Networking in Existing Non-TSN Ethernet Switches}, year = 2021 }
19.
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 }
20.
Kern, F., Kullmann, P., Ganal, E., Korwisi, K., Stingl, R., Niebling, F., Latoschik, M.E.: Off-The-Shelf Stylus: Using XR Devices for Handwriting and Sketching on Physically Aligned Virtual Surfaces. Frontiers in Virtual Reality. 2, 69 (2021).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
This article introduces the Off-The-Shelf Stylus (OTSS), a framework for 2D interaction (in 3D) as well as for handwriting and sketching with digital pen, ink, and paper on physically aligned virtual surfaces in Virtual, Augmented, and Mixed Reality (VR, AR, MR: XR for short). OTSS supports self-made XR styluses based on consumer-grade six-degrees-of-freedom XR controllers and commercially available styluses. The framework provides separate modules for three basic but vital features: 1) The stylus module provides stylus construction and calibration features. 2) The surface module provides surface calibration and visual feedback features for virtual-physical 2D surface alignment using our so-called 3ViSuAl procedure, and surface interaction features. 3) The evaluation suite provides a comprehensive test bed combining technical measurements for precision, accuracy, and latency with extensive usability evaluations including handwriting and sketching tasks based on established visuomotor, graphomotor, and handwriting research. The framework’s development is accompanied by an extensive open source reference implementation targeting the Unity game engine using an Oculus Rift S headset and Oculus Touch controllers. The development compares three low-cost and low-tech options to equip controllers with a tip and includes a web browser-based surface providing support for interacting, handwriting, and sketching. The evaluation of the reference implementation based on the OTSS framework identified an average stylus precision of 0.98 mm (SD = 0.54 mm) and an average surface accuracy of 0.60 mm (SD = 0.32 mm) in a seated VR environment. The time for displaying the stylus movement as digital ink on the web browser surface in VR was 79.40 ms on average (SD = 23.26 ms), including the physical controller’s motion-to-photon latency visualized by its virtual representation (M = 42.57 ms, SD = 15.70 ms). The usability evaluation (N = 10) revealed a low task load, high usability, and high user experience. Participants successfully reproduced given shapes and created legible handwriting, indicating that the OTSS and it’s reference implementation is ready for everyday use. We provide source code access to our implementation, including stylus and surface calibration and surface interaction features, making it easy to reuse, extend, adapt and/or replicate previous results (https://go.uniwue.de/hci-otss).
@article{kern2021offtheshelf, abstract = {This article introduces the Off-The-Shelf Stylus (OTSS), a framework for 2D interaction (in 3D) as well as for handwriting and sketching with digital pen, ink, and paper on physically aligned virtual surfaces in Virtual, Augmented, and Mixed Reality (VR, AR, MR: XR for short). OTSS supports self-made XR styluses based on consumer-grade six-degrees-of-freedom XR controllers and commercially available styluses. The framework provides separate modules for three basic but vital features: 1) The stylus module provides stylus construction and calibration features. 2) The surface module provides surface calibration and visual feedback features for virtual-physical 2D surface alignment using our so-called 3ViSuAl procedure, and surface interaction features. 3) The evaluation suite provides a comprehensive test bed combining technical measurements for precision, accuracy, and latency with extensive usability evaluations including handwriting and sketching tasks based on established visuomotor, graphomotor, and handwriting research. The framework’s development is accompanied by an extensive open source reference implementation targeting the Unity game engine using an Oculus Rift S headset and Oculus Touch controllers. The development compares three low-cost and low-tech options to equip controllers with a tip and includes a web browser-based surface providing support for interacting, handwriting, and sketching. The evaluation of the reference implementation based on the OTSS framework identified an average stylus precision of 0.98 mm (SD = 0.54 mm) and an average surface accuracy of 0.60 mm (SD = 0.32 mm) in a seated VR environment. The time for displaying the stylus movement as digital ink on the web browser surface in VR was 79.40 ms on average (SD = 23.26 ms), including the physical controller’s motion-to-photon latency visualized by its virtual representation (M = 42.57 ms, SD = 15.70 ms). The usability evaluation (N = 10) revealed a low task load, high usability, and high user experience. Participants successfully reproduced given shapes and created legible handwriting, indicating that the OTSS and it’s reference implementation is ready for everyday use. We provide source code access to our implementation, including stylus and surface calibration and surface interaction features, making it easy to reuse, extend, adapt and/or replicate previous results (https://go.uniwue.de/hci-otss).}, author = {Kern, Florian and Kullmann, Peter and Ganal, Elisabeth and Korwisi, Kristof and Stingl, Rene and Niebling, Florian and Latoschik, Marc Erich}, editor = {Zielasko, Daniel}, journal = {Frontiers in Virtual Reality}, keywords = {myown vilearn}, pages = 69, title = {Off-The-Shelf Stylus: Using XR Devices for Handwriting and Sketching on Physically Aligned Virtual Surfaces}, volume = 2, year = 2021 }
21.
Zehe, A., Konle, L., Dümpelmann, L., Gius, E., Hotho, A., Jannidis, F., Kaufmann, L., Krug, M., Puppe, F., Reiter, N., Schreiber, A., Wiedmer, N.: Detecting Scenes in Fiction: A new Segmentation Task. Proceedings of the 16th Conference of the European Chapter of the Association for Computational Linguistics: Volume 1, Long Papers. ACL (2021).
[ BibTeX ]
 
@inproceedings{zehe2021detecting, author = {Zehe, Albin and Konle, Leonard and Dümpelmann, Lea and Gius, Evelyn and Hotho, Andreas and Jannidis, Fotis and Kaufmann, Lucas and Krug, Markus and Puppe, Frank and Reiter, Nils and Schreiber, Annekea and Wiedmer, Nathalie}, booktitle = {Proceedings of the 16th Conference of the {E}uropean Chapter of the Association for Computational Linguistics: Volume 1, Long Papers}, keywords = {2021 dataset eacl kallimachos myown scenedetection scenes selected task}, publisher = {ACL}, title = {Detecting Scenes in Fiction: A new Segmentation Task}, year = 2021 }
22.
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 }
23.
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 }
24.
Donnermann, M., Lein, M., Messingschlager, T., Riedmann, A., Schaper, P., Steinhaeusser, S., Lugrin, B.: Social robots and gamification for technology supported learning: An empirical study on engagement and motivation. Computers in Human Behavior. 121, 106792 (2021).
[ BibTeX ] [ DOI ]
 
@article{Donnermann_2021, author = {Donnermann, Melissa and Lein, Martina and Messingschlager, Tanja and Riedmann, Anna and Schaper, Philipp and Steinhaeusser, Sophia and Lugrin, Birgit}, journal = {Computers in Human Behavior}, keywords = {birgit donnermann learning lein mi myown riedmann schaper steinhaeusser}, month = {aug}, pages = 106792, publisher = {Elsevier}, title = {Social robots and gamification for technology supported learning: An empirical study on engagement and motivation}, volume = 121, year = 2021 }
25.
Raies, Y., von Mammen, S.: A Swarm Grammar-Based Approach to Virtual World Generation. In: Romero, J., Martins, T., und Rodríguez-Fernández, N. (hrsg.) Artificial Intelligence in Music, Sound, Art and Design. S. 459–474. Springer International Publishing, Cham (2021).
[ Abstract ] [ BibTeX ]
 
In this work we formulate and propose an extended version of the multi-agent Swarm Grammar (SG) model for the generation of virtual worlds. It unfolds a comparatively small database into a complex world featuring terrain, vegetation and bodies of water. This approach allows for adaptivity of generated assets to their environment, unbounded worlds and interactivity in their generation. In order to evaluate the model, we conducted sensitivity analyses at a local interaction scale. In addition, at a global scale, we investigated two virtual environments, discussing notable interactions, recurring configuration patterns, and obstacles in working with SGs. These analyses showed that SGs can create visually interesting virtual worlds, but require further work in ease of use. Lastly we identified which future extensions might shrink required database sizes.
@inproceedings{10.1007/978-3-030-72914-1_30, abstract = {In this work we formulate and propose an extended version of the multi-agent Swarm Grammar (SG) model for the generation of virtual worlds. It unfolds a comparatively small database into a complex world featuring terrain, vegetation and bodies of water. This approach allows for adaptivity of generated assets to their environment, unbounded worlds and interactivity in their generation. In order to evaluate the model, we conducted sensitivity analyses at a local interaction scale. In addition, at a global scale, we investigated two virtual environments, discussing notable interactions, recurring configuration patterns, and obstacles in working with SGs. These analyses showed that SGs can create visually interesting virtual worlds, but require further work in ease of use. Lastly we identified which future extensions might shrink required database sizes.}, address = {Cham}, author = {Raies, Yasin and von Mammen, Sebastian}, booktitle = {Artificial Intelligence in Music, Sound, Art and Design}, editor = {Romero, Juan and Martins, Tiago and Rodr{í}guez-Fern{á}ndez, Nereida}, keywords = {myown}, pages = {459–474}, publisher = {Springer International Publishing}, title = {A Swarm Grammar-Based Approach to Virtual World Generation}, year = 2021 }
26.
Halbig, A., Latoschik, M.E.: A Systematic Review of Physiological Measurements, Factors, Methods, and Applications in Virtual Reality. Frontiers in Virtual Reality. 2, 89 (2021).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
Measurements of physiological parameters provide an objective, often non-intrusive, and (at least semi-)automatic evaluation and utilization of user behavior. In addition, specific hardware devices of Virtual Reality (VR) often ship with built-in sensors, i.e. eye-tracking and movements sensors. Hence, the combination of physiological measurements and VR applications seems promising. Several approaches have investigated the applicability and benefits of this combination for various fields of applications. However, the range of possible application fields, coupled with potentially useful and beneficial physiological parameters, types of sensor, target variables and factors, and analysis approaches and techniques is manifold. This article provides a systematic overview and an extensive state-of-the-art review of the usage of physiological measurements in VR. We identified 1,119 works that make use of physiological measurements in VR. Within these, we identified 32 approaches that focus on the classification of characteristics of experience, common in VR applications. The first part of this review categorizes the 1,119 works by field of application, i.e. therapy, training, entertainment, and communication and interaction, as well as by the specific target factors and variables measured by the physiological parameters. An additional category summarizes general VR approaches applicable to all specific fields of application since they target typical VR qualities. In the second part of this review, we analyze the target factors and variables regarding the respective methods used for an automatic analysis and, potentially, classification. For example, we highlight which measurement setups have been proven to be sensitive enough to distinguish different levels of arousal, valence, anxiety, stress, or cognitive workload in the virtual realm. This work may prove useful for all researchers wanting to use physiological data in VR and who want to have a good overview of prior approaches taken, their benefits and potential drawbacks.
@article{10.3389/frvir.2021.694567, abstract = {Measurements of physiological parameters provide an objective, often non-intrusive, and (at least semi-)automatic evaluation and utilization of user behavior. In addition, specific hardware devices of Virtual Reality (VR) often ship with built-in sensors, i.e. eye-tracking and movements sensors. Hence, the combination of physiological measurements and VR applications seems promising. Several approaches have investigated the applicability and benefits of this combination for various fields of applications. However, the range of possible application fields, coupled with potentially useful and beneficial physiological parameters, types of sensor, target variables and factors, and analysis approaches and techniques is manifold. This article provides a systematic overview and an extensive state-of-the-art review of the usage of physiological measurements in VR. We identified 1,119 works that make use of physiological measurements in VR. Within these, we identified 32 approaches that focus on the classification of characteristics of experience, common in VR applications. The first part of this review categorizes the 1,119 works by field of application, i.e. therapy, training, entertainment, and communication and interaction, as well as by the specific target factors and variables measured by the physiological parameters. An additional category summarizes general VR approaches applicable to all specific fields of application since they target typical VR qualities. In the second part of this review, we analyze the target factors and variables regarding the respective methods used for an automatic analysis and, potentially, classification. For example, we highlight which measurement setups have been proven to be sensitive enough to distinguish different levels of arousal, valence, anxiety, stress, or cognitive workload in the virtual realm. This work may prove useful for all researchers wanting to use physiological data in VR and who want to have a good overview of prior approaches taken, their benefits and potential drawbacks.}, author = {Halbig, Andreas and Latoschik, Marc Erich}, journal = {Frontiers in Virtual Reality}, keywords = {hci-uwb myown}, pages = 89, title = {A Systematic Review of Physiological Measurements, Factors, Methods, and Applications in Virtual Reality}, volume = 2, year = 2021 }
27.
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 }
28.
Supervisor: Dietz, K.: Generating Random Network Topologies for OMNeT++ Simulations, (2021).
[ Abstract ] [ BibTeX ]
 
Access to real-world networks or testbeds is often limited and complicates data acquisition e.g., for Machine Learning (ML). Simulation frameworks like OMNeT++ try to circumvent this issue by abstracting the networks and implementing their behavior in code. The OpenFlow OMNeT++ suite provides such means and already contains about 50 different network abstractions from the so-called TopologyZoo. In this pracical course, the task is to implement a generator that randomly creates networks that are similar to existing ones in real life. A basis to extract information of such networks can be the previously mentioned TopologyZoo.
@mastersthesis{info3-praktikum-2021-7, abstract = {Access to real-world networks or testbeds is often limited and complicates data acquisition e.g., for Machine Learning (ML). Simulation frameworks like OMNeT++ try to circumvent this issue by abstracting the networks and implementing their behavior in code. The OpenFlow OMNeT++ suite provides such means and already contains about 50 different network abstractions from the so-called TopologyZoo. In this pracical course, the task is to implement a generator that randomly creates networks that are similar to existing ones in real life. A basis to extract information of such networks can be the previously mentioned TopologyZoo.}, author = {Supervisor: Dietz, Katharina}, keywords = {myown}, school = {University of Würzburg}, title = {Generating Random Network Topologies for OMNeT++ Simulations}, year = 2021 }
29.
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 }
30.
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 }
31.
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 }
32.
Supervisor: Wehner, N.: Decentralized Virtualized Framework of Large Scale Web Browsing, (2021).
[ Abstract ] [ BibTeX ]
 
Contact: nikolas.wehner@uni-wuerzburg.de Abstract: The computation paradigms and network structures evolve more and more from centralized infrastructures towards decentralized infrastructures, where data is stored not any longer central, but only on the clients' end devices. This paves the way for novel distributed QoE monitoring approaches or distributed machine learning based techniques like Federated Learning. The goal of this work is the creation of a docker-based network simulation which allows to simulate an arbitrary number of clients performing web browsing. The web browsing shall be performed with Selenium in a headless browser and random websites shall be browsed in specific time intervals. The logged networking and application layer data shall then be stored locally on each client. The clients are further assigned to specific user profiles, which provide different network conditions, i.e., different levels of packet loss, bandwidth limitations, etc. The evaluation for this work consists of providing a proof of concept.
@mastersthesis{info3-bachelor-2021-13, abstract = {Contact: nikolas.wehner@uni-wuerzburg.de Abstract: The computation paradigms and network structures evolve more and more from centralized infrastructures towards decentralized infrastructures, where data is stored not any longer central, but only on the clients' end devices. This paves the way for novel distributed QoE monitoring approaches or distributed machine learning based techniques like Federated Learning. The goal of this work is the creation of a docker-based network simulation which allows to simulate an arbitrary number of clients performing web browsing. The web browsing shall be performed with Selenium in a headless browser and random websites shall be browsed in specific time intervals. The logged networking and application layer data shall then be stored locally on each client. The clients are further assigned to specific user profiles, which provide different network conditions, i.e., different levels of packet loss, bandwidth limitations, etc. The evaluation for this work consists of providing a proof of concept.}, author = {Supervisor: Wehner, Nikolas}, keywords = {myown ucn}, school = {University of Würzburg}, title = {Decentralized Virtualized Framework of Large Scale Web Browsing}, year = 2021 }
33.
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 }
34.
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 }
35.
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 }
36.
Büttner, J., Merz, C., von Mammen, S.: Playing with Dynamic Systems - Battling Swarms in Virtual Reality. In: Castillo, P.A. und Jiménez Laredo, J.L. (hrsg.) Applications of Evolutionary Computation. S. 309–324. Springer International Publishing, Cham (2021).
[ Abstract ] [ BibTeX ]
 
In this paper, we present a serious game with the goal to provide an engaging and immersive experience to foster the players' understanding of dynamic networked systems. Confronted with attacking swarm networks, the player has to analyse their underlying network topologies and to systematically dismantle the swarms using a set of different weapons. We detail the game design, including the artificial intelligence of the swarm, the play mechanics and the level designs. Finally, we conducted an analysis of the play performances of a test group over the course of the game which revealed a positive learning outcome.
@inproceedings{10.1007/978-3-030-72699-7_20, abstract = {In this paper, we present a serious game with the goal to provide an engaging and immersive experience to foster the players' understanding of dynamic networked systems. Confronted with attacking swarm networks, the player has to analyse their underlying network topologies and to systematically dismantle the swarms using a set of different weapons. We detail the game design, including the artificial intelligence of the swarm, the play mechanics and the level designs. Finally, we conducted an analysis of the play performances of a test group over the course of the game which revealed a positive learning outcome.}, address = {Cham}, author = {B{ü}ttner, Johannes and Merz, Christian and von Mammen, Sebastian}, booktitle = {Applications of Evolutionary Computation}, editor = {Castillo, Pedro A. and Jim{é}nez Laredo, Juan Luis}, keywords = {myown}, pages = {309–324}, publisher = {Springer International Publishing}, title = {Playing with Dynamic Systems - Battling Swarms in Virtual Reality}, year = 2021 }
37.
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 }
38.
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 }
39.
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 }
40.
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 }
41.
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 }
42.
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 }
43.
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 }
44.
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 }
45.
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 }
46.
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 }
47.
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 }
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.
Hoßfeld, T., Seufert, M., Naderi, B.: On Inter-Rater Reliability for Crowdsourced QoE. 13th International Conference on Quality of Multimedia Experience (QoMEX). , Montreal, Canada (Virtual Conference) (2021).
[ BibTeX ]
 
@inproceedings{info3-inproceedings-2021-9, address = {Montreal, Canada (Virtual Conference)}, author = {Hoßfeld, Tobias and Seufert, Michael and Naderi, Babak}, booktitle = {13th International Conference on Quality of Multimedia Experience (QoMEX)}, keywords = {myown ucn}, month = 6, title = {On Inter-Rater Reliability for Crowdsourced QoE}, year = 2021 }
50.
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 }
51.
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. 2021 IEEE Virtual Reality and 3D User Interfaces (VR). S. 382–391. IEEE (2021).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
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 = {2021 IEEE Virtual Reality and 3D User Interfaces (VR)}, keywords = {myown vrgait}, pages = {382-391}, publisher = {IEEE}, title = {The Impact of Implicit and Explicit Feedback on Performance and Experience during VR-Supported Motor Rehabilitation}, year = 2021 }
52.
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 }
53.
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 }
54.
Supervisor: Wehner, N.: Towards 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.
@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.}, author = {Supervisor: Wehner, Nikolas}, keywords = {myown ucn}, school = {University of Würzburg}, title = {Towards a Low Latency QoE Fair HAS Logic}, year = 2021 }
55.
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 }
56.
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 }
57.
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 }
58.
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. 48, 37–40 (2021).
[ 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}, month = 3, number = 4, pages = {37-40}, title = {Improving Web QoE Monitoring for Encrypted Network Traffic through Time Series Modeling}, volume = 48, year = 2021 }
59.
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 }
60.
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 }
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.
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 }
63.
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 }
64.
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 }
65.
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 }
66.
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 }
67.
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 }
68.
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 }
69.
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 }
70.
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 }
71.
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 }
72.
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 }
73.
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 }
74.
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 }
75.
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 }
76.
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 }
77.
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 }
78.
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. 2, 19 (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}, pages = 19, title = {Effects of Acrophobic Fear and Trait Anxiety on Human Behavior in a Virtual Elevated Plus-Maze}, volume = 2, year = 2021 }
79.
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 }
80.
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 }
81.
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 }
82.
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 }
83.
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 }
84.
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. 18, (2021).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
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 = {homecoming myown}, number = 68, 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}, volume = 18, year = 2021 }
85.
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 }
86.
Khelloqi, S.: Evaluation of Data Augmentation for Machine Learning on Network Traffic, (2021).
[ BibTeX ]
 
@mastersthesis{info3-bachelor-2020-9, author = {Khelloqi, Sanaa}, keywords = {myown ucn}, month = 4, school = {University of Würzburg}, title = {Evaluation of Data Augmentation for Machine Learning on Network Traffic}, year = 2021 }
87.
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 }
88.
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 }
89.
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 }
90.
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 }
91.
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 }
92.
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 }
93.
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 }
94.
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 }
95.
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 }
96.
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).
[ Abstract ] [ BibTeX ]
 
The Internet of Things (IoT) is expected to play an increasingly important role in next-generation mobile networks. Detailed knowledge of this type of traffic and the associated signaling in those networks is of interest to operators and standardization in order to run these networks successfully. The aim of this study is to characterize IoT signaling traffic for mobile communication networks (i) from a network operator’s point of view, (ii) at device level, and (iii) for the establishment of data connections. General statistics on signaling and device behavior, such as the observed IoT traffic volume and message composition, are given before device classes with statistically different signaling behavior are identified. Finally, by characterizing the aggre- gated signaling traffic, we show that the Markov assumption, widespread in standardization and literature, regarding the aggregated arrival process for data connections does not apply in reality.
@inproceedings{info3-inproceedings-2021-1, abstract = {The Internet of Things (IoT) is expected to play an increasingly important role in next-generation mobile networks. Detailed knowledge of this type of traffic and the associated signaling in those networks is of interest to operators and standardization in order to run these networks successfully. The aim of this study is to characterize IoT signaling traffic for mobile communication networks (i) from a network operator’s point of view, (ii) at device level, and (iii) for the establishment of data connections. General statistics on signaling and device behavior, such as the observed IoT traffic volume and message composition, are given before device classes with statistically different signaling behavior are identified. Finally, by characterizing the aggre- gated signaling traffic, we show that the Markov assumption, widespread in standardization and literature, regarding the aggregated arrival process for data connections does not apply in reality.}, 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 }
97.
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 }
98.
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 }
99.
Hein, R.M., Wienrich, C., Latoschik, M.E.: A systematic review of foreign language learning with immersive technologies (2001-2020). AIMS Electronics and Electrical Engineering. 5, 117–145 (2021).
[ BibTeX ]
 
@article{noauthororeditor, author = {Hein, Rebecca M. and Wienrich, Carolin and Latoschik, Marc E.}, journal = {AIMS Electronics and Electrical Engineering}, keywords = {hci-uwb myown rhein}, number = 2, pages = {117–145}, title = {A systematic review of foreign language learning with immersive technologies (2001-2020)}, volume = 5, year = 2021 }

2020 [ nach oben ]

1.
Supervisor: Loh, F.: Solving the Collision Problem with Aggregation? A Measurement Driven LoRaWAN Study., (2020).
[ BibTeX ]
 
@mastersthesis{info3-bachelor-2020-13, author = {Supervisor: Loh, Frank}, keywords = {myown 5mart}, school = {University of Würzburg}, title = {Solving the Collision Problem with Aggregation? A Measurement Driven LoRaWAN Study.}, year = 2020 }
2.
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 }
3.
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 }
4.
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 }
5.
Seufert, M.: Statistical Methods and Models based on Quality of Experience Distributions. Quality and User Experience. 6, (2020).
[ Abstract ] [ BibTeX ]
 
Due to biased assumptions on the underlying ordinal rating scale in subjective Quality of Experience (QoE) studies, Mean Opinion Score (MOS)-based evaluations provide results, which are hard to interpret and can be misleading. This paper proposes to consider the full QoE distribution for evaluating, reporting, and modeling QoE results instead of relying on MOS-based metrics derived from results based on ordinal rating scales. The QoE distribution can be represented in a concise way by using the parameters of a multinomial distribution without losing any information about the underlying QoE ratings, and even keeps backward compatibility with previous, biased MOS-based results. Considering QoE results as a realization of a multinomial distribution allows to rely on a well-established theoretical background, which enables meaningful evaluations also for ordinal rating scales. Moreover, QoE models based on QoE distributions keep detailed information from the results of a QoE study of a technical system, and thus, give an unprecedented richness of insights into the end users’ experience with the technical system. In this work, existing and novel statistical methods for QoE distributions are summarized and exemplary evaluations are outlined. Furthermore, using the novel concept of quality steps, simulative and analytical QoE models based on QoE distributions are presented and showcased. The goal is to demonstrate the fundamental advantages of considering QoE distributions over MOS-based evaluations if the underlying rating data is ordinal in nature.
@article{info3-article-2020-7, abstract = {Due to biased assumptions on the underlying ordinal rating scale in subjective Quality of Experience (QoE) studies, Mean Opinion Score (MOS)-based evaluations provide results, which are hard to interpret and can be misleading. This paper proposes to consider the full QoE distribution for evaluating, reporting, and modeling QoE results instead of relying on MOS-based metrics derived from results based on ordinal rating scales. The QoE distribution can be represented in a concise way by using the parameters of a multinomial distribution without losing any information about the underlying QoE ratings, and even keeps backward compatibility with previous, biased MOS-based results. Considering QoE results as a realization of a multinomial distribution allows to rely on a well-established theoretical background, which enables meaningful evaluations also for ordinal rating scales. Moreover, QoE models based on QoE distributions keep detailed information from the results of a QoE study of a technical system, and thus, give an unprecedented richness of insights into the end users’ experience with the technical system. In this work, existing and novel statistical methods for QoE distributions are summarized and exemplary evaluations are outlined. Furthermore, using the novel concept of quality steps, simulative and analytical QoE models based on QoE distributions are presented and showcased. The goal is to demonstrate the fundamental advantages of considering QoE distributions over MOS-based evaluations if the underlying rating data is ordinal in nature.}, author = {Seufert, Michael}, journal = {Quality and User Experience}, keywords = {myown ucn}, month = 12, number = 1, title = {Statistical Methods and Models based on Quality of Experience Distributions}, volume = 6, year = 2020 }
6.
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 }
7.
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 }
8.
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 }
9.
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 }
10.
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 }
11.
Borchert, K.: Estimating Quality of Experience of Enterprise Applications - A Crowdsourcing-based Approach, (2020).
[ BibTeX ]
 
@phdthesis{info3-dissertation-2020-1, author = {Borchert, Kathrin}, keywords = {myown}, month = 10, school = {University of Würzburg}, title = {Estimating Quality of Experience of Enterprise Applications - A Crowdsourcing-based Approach}, year = 2020 }
12.
Tönsing, L.: Prediction of YouTube’s Chunk Request from Monitored Encrypted Network Traffic, (2020).
[ BibTeX ]
 
@mastersthesis{info3-master-2020-13, author = {Tönsing, Lukas}, keywords = {myown}, month = 9, school = {University of Würzburg}, title = {Prediction of YouTube's Chunk Request from Monitored Encrypted Network Traffic}, year = 2020 }
13.
Fischer, M., Kobs, K., Hotho, A.: NICER — Aesthetic Image Enhancement with Humans in the Loop. ACHI 2020: The Thirteenth International Conference on Advances in Computer-Human Interactions. S. 357–362 (2020).
[ Abstract ] [ BibTeX ]
 
Fully- or semi-automatic image enhancement software helps users to increase the visual appeal of photos and does not require in-depth knowledge of manual image editing. However, fully-automatic approaches usually enhance the image in a black-box manner that does not give the user any control over the optimization process, possibly leading to edited images that do not subjectively appeal to the user. Semi-automatic methods mostly allow for controlling which pre-defined editing step is taken, which restricts the users in their creativity and ability to make detailed adjustments, such as brightness or contrast. We argue that incorporating user preferences by guiding an automated enhancement method simplifies image editing and increases the enhancement’s focus on the user. This work thus proposes the Neural Image Correction & Enhancement Routine (NICER), a neural network based approach to no-reference image enhancement in a fully-, semi-automatic or fully manual process that is interactive and user-centered. NICER iteratively adjusts image editing parameters in order to maximize an aesthetic score based on image style and content. Users can modify these parameters at any time and guide the optimization process towards a desired direction. This interactive workflow is a novelty in the field of human-computer interaction for image enhancement tasks. In a user study, we show that NICER can improve image aesthetics without user interaction and that allowing user interaction leads to diverse enhancement outcomes that are strongly preferred over the unedited image. We make our code publicly available to facilitate further research in this direction.
@inproceedings{fischer2020nicer, abstract = {Fully- or semi-automatic image enhancement software helps users to increase the visual appeal of photos and does not require in-depth knowledge of manual image editing. However, fully-automatic approaches usually enhance the image in a black-box manner that does not give the user any control over the optimization process, possibly leading to edited images that do not subjectively appeal to the user. Semi-automatic methods mostly allow for controlling which pre-defined editing step is taken, which restricts the users in their creativity and ability to make detailed adjustments, such as brightness or contrast. We argue that incorporating user preferences by guiding an automated enhancement method simplifies image editing and increases the enhancement’s focus on the user. This work thus proposes the Neural Image Correction & Enhancement Routine (NICER), a neural network based approach to no-reference image enhancement in a fully-, semi-automatic or fully manual process that is interactive and user-centered. NICER iteratively adjusts image editing parameters in order to maximize an aesthetic score based on image style and content. Users can modify these parameters at any time and guide the optimization process towards a desired direction. This interactive workflow is a novelty in the field of human-computer interaction for image enhancement tasks. In a user study, we show that NICER can improve image aesthetics without user interaction and that allowing user interaction leads to diverse enhancement outcomes that are strongly preferred over the unedited image. We make our code publicly available to facilitate further research in this direction.}, author = {Fischer, Michael and Kobs, Konstantin and Hotho, Andreas}, journal = {ACHI 2020: The Thirteenth International Conference on Advances in Computer-Human Interactions}, keywords = {2020 image-assessment image-editing myown}, pages = {357-362}, title = {NICER — Aesthetic Image Enhancement with Humans in the Loop}, year = 2020 }
14.
Wienrich, C., Döllinger, N.I., Hein, R.: Mind the Gap: A Framework (BehaveFIT) Guiding The Use of Immersive Technologies in Behavior Change Processes. arXiv preprint arXiv:2012.10912. (2020).
[ BibTeX ]
 
@article{wienrich2020mind, author = {Wienrich, Carolin and D{ö}llinger, Nina Ines and Hein, Rebecca}, journal = {arXiv preprint arXiv:2012.10912}, keywords = {myown rebecca.hein rhein}, title = {Mind the Gap: A Framework (BehaveFIT) Guiding The Use of Immersive Technologies in Behavior Change Processes}, year = 2020 }
15.
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 LREC2020 Workshop ``People in language, vision and the mind’’ (ONION2020). S. 28–33. European Language Resources Association (ELRA), Marseille, France (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.}, address = {Marseille, France}, author = {Schl{ö}r, Daniel and Zehe, Albin and Kobs, Konstantin and Veseli, Blerta and Westermeier, Franziska and Br{ü}bach, Larissa and Roth, Daniel and Latoschik, Marc Erich and Hotho, Andreas}, booktitle = {Proceedings of LREC2020 Workshop ``People in language, vision and the mind'' (ONION2020)}, keywords = {2020 biofeedback from:albinzehe mutlimodal myown neuralnet sentiment sentimentanalysis}, month = {may}, pages = {28–33}, publisher = {European Language Resources Association (ELRA)}, title = {Improving Sentiment Analysis with Biofeedback Data}, year = 2020 }
16.
Steininger, M., Kobs, K., Zehe, A., Lautenschlager, F., Becker, M., Hotho, A.: MapLUR: Exploring a New Paradigm for Estimating Air Pollution Using Deep Learning on Map Images. ACM Trans. Spatial Algorithms Syst. 6, (2020).
[ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
 
Land-use regression (LUR) models are important for the assessment of air pollution concentrations in areas without measurement stations. While many such models exist, they often use manually constructed features based on restricted, locally available data. Thus, they are typically hard to reproduce and challenging to adapt to areas beyond those they have been developed for. In this paper, we advocate a paradigm shift for LUR models: We propose the Data-driven, Open, Global (DOG) paradigm that entails models based on purely data-driven approaches using only openly and globally available data. Progress within this paradigm will alleviate the need for experts to adapt models to the local characteristics of the available data sources and thus facilitate the generalizability of air pollution models to new areas on a global scale. In order to illustrate the feasibility of the DOG paradigm for LUR, we introduce a deep learning model called MapLUR. It is based on a convolutional neural network architecture and is trained exclusively on globally and openly available map data without requiring manual feature engineering. We compare our model to state-of-the-art baselines like linear regression, random forests and multi-layer perceptrons using a large data set of modeled NO2 concentrations in Central London. Our results show that MapLUR significantly outperforms these approaches even though they are provided with manually tailored features. Furthermore, we illustrate that the automatic feature extraction inherent to models based on the DOG paradigm can learn features that are readily interpretable and closely resemble those commonly used in traditional LUR approaches.
@article{steininger2020maplur, abstract = {Land-use regression (LUR) models are important for the assessment of air pollution concentrations in areas without measurement stations. While many such models exist, they often use manually constructed features based on restricted, locally available data. Thus, they are typically hard to reproduce and challenging to adapt to areas beyond those they have been developed for. In this paper, we advocate a paradigm shift for LUR models: We propose the Data-driven, Open, Global (DOG) paradigm that entails models based on purely data-driven approaches using only openly and globally available data. Progress within this paradigm will alleviate the need for experts to adapt models to the local characteristics of the available data sources and thus facilitate the generalizability of air pollution models to new areas on a global scale. In order to illustrate the feasibility of the DOG paradigm for LUR, we introduce a deep learning model called MapLUR. It is based on a convolutional neural network architecture and is trained exclusively on globally and openly available map data without requiring manual feature engineering. We compare our model to state-of-the-art baselines like linear regression, random forests and multi-layer perceptrons using a large data set of modeled NO2 concentrations in Central London. Our results show that MapLUR significantly outperforms these approaches even though they are provided with manually tailored features. Furthermore, we illustrate that the automatic feature extraction inherent to models based on the DOG paradigm can learn features that are readily interpretable and closely resemble those commonly used in traditional LUR approaches.}, address = {New York, NY, USA}, author = {Steininger, Michael and Kobs, Konstantin and Zehe, Albin and Lautenschlager, Florian and Becker, Martin and Hotho, Andreas}, journal = {ACM Trans. Spatial Algorithms Syst.}, keywords = {2020 Land-use air deep learning myown pollution regression}, month = {apr}, number = 3, publisher = {Association for Computing Machinery}, title = {MapLUR: Exploring a New Paradigm for Estimating Air Pollution Using Deep Learning on Map Images}, volume = 6, year = 2020 }
17.
Steininger, M., Abel, D., Ziegler, K., Krause, A., Paeth, H., Hotho, A.: Deep Learning for Climate Model Output Statistics. Tackling Climate Change with Machine Learning Workshop at NeurIPS 2020. (2020).
[ BibTeX ] [ URL ]
 
@article{steininger2020learning, author = {Steininger, Michael and Abel, Daniel and Ziegler, Katrin and Krause, Anna and Paeth, Heiko and Hotho, Andreas}, journal = {Tackling Climate Change with Machine Learning Workshop at NeurIPS 2020}, keywords = {2020 climate mos myown}, title = {Deep Learning for Climate Model Output Statistics}, year = 2020 }
18.
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 }
19.
Dulny, A., Steininger, M., Lautenschlager, F., Krause, A., Hotho, A.: Evaluating the multi-task learning approach for land use regression modelling of air pollution. International Conference on Frontiers of Artificial Intelligence and Machine Learning. IASED (2020).
[ Abstract ] [ BibTeX ]
 
Air pollution has been linked to several health problems including heart disease, stroke and lung cancer. Modelling and analyzing this dependency requires reliable and accurate air pollutant measurements collected by stationary air monitoring stations. However, usually only a low number of such stations are present within a single city. To retrieve pollution concentrations for unmeasured locations, researchers rely on land use regression (LUR) models. Those models are typically developed for one pollutant only. However, as results in different areas have shown, modelling several related output variables through multi-task learning can improve the prediction results of the models significantly. In this work, we compared prediction results from single-task and multi-task learning multilayer perceptron models on measurements taken from the OpenSense dataset and the London Atmospheric Emissions Inventory dataset. LUR features were generated from OpenStreetMap using OpenLUR and used to train hard parameter sharing multilayer perceptron models. The results show multi-task learning with sufficient data significantly improves the performance of a LUR model.
@inproceedings{dulny2020evaluating, abstract = {Air pollution has been linked to several health problems including heart disease, stroke and lung cancer. Modelling and analyzing this dependency requires reliable and accurate air pollutant measurements collected by stationary air monitoring stations. However, usually only a low number of such stations are present within a single city. To retrieve pollution concentrations for unmeasured locations, researchers rely on land use regression (LUR) models. Those models are typically developed for one pollutant only. However, as results in different areas have shown, modelling several related output variables through multi-task learning can improve the prediction results of the models significantly. In this work, we compared prediction results from single-task and multi-task learning multilayer perceptron models on measurements taken from the OpenSense dataset and the London Atmospheric Emissions Inventory dataset. LUR features were generated from OpenStreetMap using OpenLUR and used to train hard parameter sharing multilayer perceptron models. The results show multi-task learning with sufficient data significantly improves the performance of a LUR model.}, author = {Dulny, Andrzej and Steininger, Michael and Lautenschlager, Florian and Krause, Anna and Hotho, Andreas}, booktitle = {International Conference on Frontiers of Artificial Intelligence and Machine Learning}, keywords = {2020 from:msteininger lur myown}, organization = {IASED}, title = {Evaluating the multi-task learning approach for land use regression modelling of air pollution}, 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.
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 }
22.
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 }
23.
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 }
24.
Tritscher, J., Ring, M., Schlr, D., Hettinger, L., Hotho, A.: Evaluation of Post-hoc XAI Approaches Through Synthetic Tabular Data. In: Helic, D., Leitner, G., Stettinger, M., Felfernig, A., und Ra’s, Z.W. (hrsg.) Foundations of Intelligent Systems. S. 422–430. Springer International Publishing, Cham (2020).
[ Abstract ] [ BibTeX ]
 
Evaluating the explanations given by post-hoc XAI approaches on tabular data is a challenging prospect, since the subjective judgement of explanations of tabular relations is non trivial in contrast to e.g. the judgement of image heatmap explanations. In order to quantify XAI performance on categorical tabular data, where feature relationships can often be described by Boolean functions, we propose an evaluation setting through generation of synthetic datasets. To create gold standard explanations, we present a definition of feature relevance in Boolean functions. In the proposed setting we evaluate eight state-of-the-art XAI approaches and gain novel insights into XAI performance on categorical tabular data. We find that the investigated approaches often fail to faithfully explain even basic relationships within categorical data.
@inproceedings{tritscher2020evaluation, abstract = {Evaluating the explanations given by post-hoc XAI approaches on tabular data is a challenging prospect, since the subjective judgement of explanations of tabular relations is non trivial in contrast to e.g. the judgement of image heatmap explanations. In order to quantify XAI performance on categorical tabular data, where feature relationships can often be described by Boolean functions, we propose an evaluation setting through generation of synthetic datasets. To create gold standard explanations, we present a definition of feature relevance in Boolean functions. In the proposed setting we evaluate eight state-of-the-art XAI approaches and gain novel insights into XAI performance on categorical tabular data. We find that the investigated approaches often fail to faithfully explain even basic relationships within categorical data.}, address = {Cham}, author = {Tritscher, Julian and Ring, Markus and Schlr, Daniel and Hettinger, Lena and Hotho, Andreas}, booktitle = {Foundations of Intelligent Systems}, editor = {Helic, Denis and Leitner, Gerhard and Stettinger, Martin and Felfernig, Alexander and Ra{{{\'s}}}, Zbigniew W.}, keywords = {2020 data datasets evaluation myown tabular xai}, pages = {422–430}, publisher = {Springer International Publishing}, title = {Evaluation of Post-hoc XAI Approaches Through Synthetic Tabular Data}, year = 2020 }
25.
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 selected semantic}, pages = {456–473}, publisher = {Springer International Publishing}, title = {LM4KG: Improving Common Sense Knowledge Graphs with Language Models}, year = 2020 }
26.
Kobs, K., Steininger, M., Zehe, A., Lautenschlager, F., Hotho, A.: SimLoss: Class Similarities in Cross Entropy. In: Helic, D., Leitner, G., Stettinger, M., Felfernig, A., und Ra’s, Z.W. (hrsg.) Foundations of Intelligent Systems. S. 431–439. Springer International Publishing, Cham (2020).
[ Abstract ] [ BibTeX ] [ URL ]
 
One common loss function in neural network classification tasks is Categorical Cross Entropy (CCE), which punishes all misclassifications equally. However, classes often have an inherent structure. For instance, classifying an image of a rose as ``violet'' is better than as ``truck''. We introduce SimLoss, a drop-in replacement for CCE that incorporates class similarities along with two techniques to construct such matrices from task-specific knowledge. We test SimLoss on Age Estimation and Image Classification and find that it brings significant improvements over CCE on several metrics. SimLoss therefore allows for explicit modeling of background knowledge by simply exchanging the loss function, while keeping the neural network architecture the same. Code and additional resources are available at https://github.com/konstantinkobs/SimLoss
@inproceedings{kobs2020simloss, abstract = {One common loss function in neural network classification tasks is Categorical Cross Entropy (CCE), which punishes all misclassifications equally. However, classes often have an inherent structure. For instance, classifying an image of a rose as ``violet'' is better than as ``truck''. We introduce SimLoss, a drop-in replacement for CCE that incorporates class similarities along with two techniques to construct such matrices from task-specific knowledge. We test SimLoss on Age Estimation and Image Classification and find that it brings significant improvements over CCE on several metrics. SimLoss therefore allows for explicit modeling of background knowledge by simply exchanging the loss function, while keeping the neural network architecture the same. Code and additional resources are available at https://github.com/konstantinkobs/SimLoss}, address = {Cham}, author = {Kobs, Konstantin and Steininger, Michael and Zehe, Albin and Lautenschlager, Florian and Hotho, Andreas}, booktitle = {Foundations of Intelligent Systems}, editor = {Helic, Denis and Leitner, Gerhard and Stettinger, Martin and Felfernig, Alexander and Ra{{{\'s}}}, Zbigniew W.}, keywords = {2020 cross entropy function loss myown}, pages = {431–439}, publisher = {Springer International Publishing}, title = {SimLoss: Class Similarities in Cross Entropy}, year = 2020 }
27.
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 }
28.
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 }
29.
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 }
30.
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 }
31.
Kobs, K., Potthast, M., Wiegmann, M., Zehe, A., Stein, B., Hotho, A.: Towards Predicting the Subscription Status of Twitch.tv Users. Proceedings of ECML-PKDD 2020 ChAT Discovery Challenge on Chat Analytics for Twitch. (2020).
[ BibTeX ] [ URL ]
 
@article{kobs2020towards, author = {Kobs, Konstantin and Potthast, Martin and Wiegmann, Matti and Zehe, Albin and Stein, Benno and Hotho, Andreas}, journal = {Proceedings of ECML-PKDD 2020 ChAT Discovery Challenge on Chat Analytics for Twitch}, keywords = {2020 myown twitch}, title = {Towards Predicting the Subscription Status of Twitch.tv Users}, year = 2020 }
32.
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 }
33.
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 }
34.
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 }
35.
Zehe, A., Arns, J., Hettinger, L., Hotho, A.: HarryMotions – Classifying Relationships in Harry Potter based on Emotion Analysis. 5th SwissText & 16th KONVENS Joint Conference (2020).
[ BibTeX ]
 
@inproceedings{zehe2020harrymotions, author = {Zehe, Albin and Arns, Julia and Hettinger, Lena and Hotho, Andreas}, booktitle = {5th SwissText & 16th KONVENS Joint Conference}, keywords = {2020 bert harrymotions harrypotter myown myown:selected nlp proposal-knowledge sentiment sentimentanalysis}, title = {HarryMotions – Classifying Relationships in Harry Potter based on Emotion Analysis}, year = 2020 }
36.
Schlör, D., Ring, M., Krause, A., Hotho, A.: Financial Fraud Detection with Improved Neural Arithmetic Logic Units. (2020).
[ BibTeX ]
 
@proceedings{schlor2020financial, author = {Schlör, Daniel and Ring, Markus and Krause, Anna and Hotho, Andreas}, keywords = {2020 detection finacial fraud inalu myown}, number = 5, title = {Financial Fraud Detection with Improved Neural Arithmetic Logic Units}, volume = {Fifth Workshop on MIning DAta for financial applicationS}, year = 2020 }
37.
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 vraudi 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 }
38.
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 }
39.
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 }
40.
Supervisor: Metzger, F.: Design and Evaluation of a Cloud Gaming Crowdsourcing Study, (2020).
[ Abstract ] [ BibTeX ]
 
The second wave of cloud gaming services is currently gaining traction. But we are still not sure of the subjective experience of games streamed over these services when compared to them running locally. Your task in this work would be to design the methodology for a crowdsourcing QoE assessment for cloud gaming, execute it and subsequently evaluate its results.
@mastersthesis{info3-master-2020-7, abstract = {The second wave of cloud gaming services is currently gaining traction. But we are still not sure of the subjective experience of games streamed over these services when compared to them running locally. Your task in this work would be to design the methodology for a crowdsourcing QoE assessment for cloud gaming, execute it and subsequently evaluate its results.}, author = {Supervisor: Metzger, Florian}, keywords = {myown fullstack}, month = 7, school = {University of Würzburg}, title = {Design and Evaluation of a Cloud Gaming Crowdsourcing Study}, year = 2020 }
41.
Poignée, F.: Machine Learning Approach to Predict Video Streaming Behavior at Network Layer, (2020).
[ BibTeX ]
 
@mastersthesis{info3-master-2020-15, author = {Poignée, Fabian}, keywords = {myown}, month = 9, school = {University of Würzburg}, title = {Machine Learning Approach to Predict Video Streaming Behavior at Network Layer}, year = 2020 }
42.
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 }
43.
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 }
44.
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 }
45.
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 }
46.
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 }
47.
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 }
48.
Messemer, H., Perera, W.L., Heinz, M., Niebling, F., Maiwald, F.: Supporting Learning in Art History--Artificial Intelligence in Digital Humanities Education. Workshop Gemeinschaften in Neuen Medien (GeNeMe) 2020. TUDpress (2020).
[ BibTeX ]
 
@inproceedings{messemer2020supporting, author = {Messemer, Heike and Perera, Walpola Layantha and Heinz, Matthias and Niebling, Florian and Maiwald, Ferdinand}, booktitle = {Workshop Gemeinschaften in Neuen Medien (GeNeMe) 2020}, keywords = {histstadt4d myown niebling}, organization = {TUDpress}, title = {Supporting Learning in Art History–Artificial Intelligence in Digital Humanities Education}, 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.
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 }
51.
Ripka, G., Grafe, S., Latoschik, M.E.: Preservice Teachers’ encounter with Social VR – Exploring Virtual Teaching and Learning Processes in Initial Teacher Education. In: Langran, E. (hrsg.) SITE Interactive Conference. S. 549–562. Association for the Advancement of Computing in Education (AACE) (2020).
[ Abstract ] [ BibTeX ] [ URL ]
 
With 21st century challenges ahead, higher education teaching and learning need new pedagogical concepts. Technologies like social VR enable student-centered, action-oriented, and situated learning. This paper presents findings of the pedagogical implementation of a distributed social VR prototype, a fully immersive VR learning environment, into an Initial Teacher Education program in Germany. The exploratory study addressed the following research questions: 1) How do preservice teachers perceive teaching and learning activities in fully immersive VR and 2) how should teaching and learning processes using social VR in Teacher Education be designed? It followed a design-based research approach. The pedagogical concept for teaching and learning in social VR was based on principles of action-orientation. A convenience sample of three groups of five students each took part in a 90-minute teaching and learning scenario using a fully immersive VR learning environment. During these seminar units, students engaged in qualitative group interviews and shared their perception of the action-oriented teaching and learning activities in VR. The results showed that preservice teachers had the feeling of being less distracted in social VR. Additionally, during group activities, missing social and behavioral cues made communication procedures more challenging for participants. However, some participants noticed a stronger sense of community while collaborating with others.
@inproceedings{ripka2020preservice, abstract = {With 21st century challenges ahead, higher education teaching and learning need new pedagogical concepts. Technologies like social VR enable student-centered, action-oriented, and situated learning. This paper presents findings of the pedagogical implementation of a distributed social VR prototype, a fully immersive VR learning environment, into an Initial Teacher Education program in Germany. The exploratory study addressed the following research questions: 1) How do preservice teachers perceive teaching and learning activities in fully immersive VR and 2) how should teaching and learning processes using social VR in Teacher Education be designed? It followed a design-based research approach. The pedagogical concept for teaching and learning in social VR was based on principles of action-orientation. A convenience sample of three groups of five students each took part in a 90-minute teaching and learning scenario using a fully immersive VR learning environment. During these seminar units, students engaged in qualitative group interviews and shared their perception of the action-oriented teaching and learning activities in VR. The results showed that preservice teachers had the feeling of being less distracted in social VR. Additionally, during group activities, missing social and behavioral cues made communication procedures more challenging for participants. However, some participants noticed a stronger sense of community while collaborating with others.}, author = {Ripka, Gabriela and Grafe, Silke and Latoschik, Marc Erich}, booktitle = {SITE Interactive Conference}, editor = {Langran, Elizabeth}, keywords = {myown}, pages = {549–562}, publisher = {Association for the Advancement of Computing in Education (AACE)}, title = {Preservice Teachers' encounter with Social VR – Exploring Virtual Teaching and Learning Processes in Initial Teacher Education}, year = 2020 }
52.
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 }
53.
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 }
54.
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 }
55.
Bauer, A., Züfle, M., Herbst, N., Zehe, A., Hotho, A., Kounev, S.: Time Series Forecasting for Self-Aware Systems. Proceedings of the IEEE. 1–26 (2020).
[ Abstract ] [ BibTeX ] [ DOI ]
 
Modern distributed systems and Internet-of-Things applications are governed by fast living and changing requirements. Moreover, they have to struggle with huge amounts of data that they create or have to process. To improve the self-awareness of such systems and enable proactive and autonomous decisions, reliable time series forecasting methods are required. However, selecting a suitable forecasting method for a given scenario is a challenging task. According to the ``No-Free-Lunch Theorem,'' there is no general forecasting method that always performs best. Thus, manual feature engineering remains to be a mandatory expert task to avoid trial and error. Furthermore, determining the expected time-to-result of existing forecasting methods is a challenge. In this article, we extensively assess the state-of-the-art in time series forecasting. We compare existing methods and discuss the issues that have to be addressed to enable their use in a self-aware computing context. To address these issues, we present a step-by-step approach to fully automate the feature engineering and forecasting process. Then, following the principles from benchmarking, we establish a level-playing field for evaluating the accuracy and time-to-result of automated forecasting methods for a broad set of application scenarios. We provide results of a benchmarking competition to guide in selecting and appropriately using existing forecasting methods for a given self-aware computing context. Finally, we present a case study in the area of self-aware data-center resource management to exemplify the benefits of fully automated learning and reasoning processes on time series data.
@article{bauer2020series, abstract = {Modern distributed systems and Internet-of-Things applications are governed by fast living and changing requirements. Moreover, they have to struggle with huge amounts of data that they create or have to process. To improve the self-awareness of such systems and enable proactive and autonomous decisions, reliable time series forecasting methods are required. However, selecting a suitable forecasting method for a given scenario is a challenging task. According to the ``No-Free-Lunch Theorem,'' there is no general forecasting method that always performs best. Thus, manual feature engineering remains to be a mandatory expert task to avoid trial and error. Furthermore, determining the expected time-to-result of existing forecasting methods is a challenge. In this article, we extensively assess the state-of-the-art in time series forecasting. We compare existing methods and discuss the issues that have to be addressed to enable their use in a self-aware computing context. To address these issues, we present a step-by-step approach to fully automate the feature engineering and forecasting process. Then, following the principles from benchmarking, we establish a level-playing field for evaluating the accuracy and time-to-result of automated forecasting methods for a broad set of application scenarios. We provide results of a benchmarking competition to guide in selecting and appropriately using existing forecasting methods for a given self-aware computing context. Finally, we present a case study in the area of self-aware data-center resource management to exemplify the benefits of fully automated learning and reasoning processes on time series data.}, author = {{Bauer}, A. and {Züfle}, M. and {Herbst}, N. and {Zehe}, A. and {Hotho}, A. and {Kounev}, S.}, journal = {Proceedings of the IEEE}, keywords = {2020 Forecasting myown survey timeseries}, pages = {1-26}, title = {Time Series Forecasting for Self-Aware Systems}, year = 2020 }
56.
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 }
57.
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 }
58.
Wehner, N., Mertinat, N., Seufert, M., Hoßfeld, T.: Studying the Impact of the Content Selection Method on the Video QoE on Mobile Devices, (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.
@misc{info3-poster-2020-2, 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 }
59.
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 }
60.
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 }
61.
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 }
62.
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 }
63.
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 }
64.
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 }
65.
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 }
66.
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 }
67.
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 }
68.
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.