Veröffentlichungen

2020 [ nach oben ]

• 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 }
• Münster, S., Niebling, F., Bruschke, J., Barthel, K., Friedrichs, K., Kröber, C., Maiwald, F.: Urban History Research and Discovery in the Age of Digital Repositories. A Report About Users and Requirements. In: Kremers, H. (hrsg.) Digital Cultural Heritage. S. 63--84. Springer International Publishing, Cham (2020).
  [ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
   
  The research group on four-dimensional research and communication of urban history (HistStadt4D) investigates and develops methods and technologies to transfer extensive repositories of historical photographs and their contextual information into a three-dimensional spatial model, with an additional temporal component. This will make content accessible to researchers and the public, via a 4D browser as well as a location-dependent augmented reality representation. Against this background, this article highlights users and requirements of both scholarly and touristic usage of digital information about urban history, in particular historical photographs.
  @inbook{Münster2020, abstract = {The research group on four-dimensional research and communication of urban history (HistStadt4D) investigates and develops methods and technologies to transfer extensive repositories of historical photographs and their contextual information into a three-dimensional spatial model, with an additional temporal component. This will make content accessible to researchers and the public, via a 4D browser as well as a location-dependent augmented reality representation. Against this background, this article highlights users and requirements of both scholarly and touristic usage of digital information about urban history, in particular historical photographs.}, address = {Cham}, author = {Münster, Sander and Niebling, Florian and Bruschke, Jonas and Barthel, Kristina and Friedrichs, Kristina and Kröber, Cindy and Maiwald, Ferdinand}, booktitle = {Digital Cultural Heritage}, editor = {Kremers, Horst}, keywords = {histstadt4d myown niebling}, pages = {63--84}, publisher = {Springer International Publishing}, title = {Urban History Research and Discovery in the Age of Digital Repositories. A Report About Users and Requirements}, year = 2020 }

2019, to appear [ nach oben ]

• Roth, D., Bente, G., Kullmann, P., Mal, D., Purps, C.F., Vogeley, K., Latoschik, M.E.: Technologies for Social Augmentations in User-Embodied Virtual Reality. 25th ACM Symposium on Virtual Reality Software and Technology (2019, to appear).
  [ Abstract ] [ BibTeX ] [ DOI ]
   
  Technologies for Virtual, Mixed, and Augmented Reality (VR, MR, and AR) allow to artificially augment social interactions and thus to go beyond what is possible in real life. Motivations for the use of social augmentations are manifold, for example, to synthesize behavior when sensory input is missing, to provide additional affordances in shared environments, or to support inclusion and training of individuals with social communication disorders. We review and categorize augmentation approaches and propose a software architecture based on four data layers. Three components further handle the status analysis, the modification, and the blending of behaviors. We present a prototype (injectX) that supports behavior tracking (body motion, eye gaze, and facial expressions from the lower face), status analysis, decision-making, augmentation, and behavior blending in immersive interactions. Along with a critical reflection, we consider further technical and ethical aspects.
  @conference{roth2019technologies, abstract = {Technologies for Virtual, Mixed, and Augmented Reality (VR, MR, and AR) allow to artificially augment social interactions and thus to go beyond what is possible in real life. Motivations for the use of social augmentations are manifold, for example, to synthesize behavior when sensory input is missing, to provide additional affordances in shared environments, or to support inclusion and training of individuals with social communication disorders. We review and categorize augmentation approaches and propose a software architecture based on four data layers. Three components further handle the status analysis, the modification, and the blending of behaviors. We present a prototype (injectX) that supports behavior tracking (body motion, eye gaze, and facial expressions from the lower face), status analysis, decision-making, augmentation, and behavior blending in immersive interactions. Along with a critical reflection, we consider further technical and ethical aspects.}, author = {Roth, Daniel and Bente, Gary and Kullmann, Peter and Mal, David and Purps, Christian Felix and Vogeley, Kai and Latoschik, Marc Erich}, booktitle = {25th ACM Symposium on Virtual Reality Software and Technology}, keywords = {droth insync myown}, month = {November}, series = {VRST '19}, title = {Technologies for Social Augmentations in User-Embodied Virtual Reality}, year = {2019, to appear} }
• Wolf, E., Heinrich, R., Michalek, A., Schraudt, D., Hohm, A., Hein, R., Grundgeiger, T., Happel, O.: Rapid Preparation of Eye Tracking Data for Debriefung in Medical Training: A Feasibility Study. Proceedings of the 63rd Annual Meeting of the Human Factors and Ergonomics Society (2019, to appear).
  [ BibTeX ]
   
  @inproceedings{noauthororeditor2019toappearrapid, author = {Wolf, Erik and Heinrich, Ronja and Michalek, Annabell and Schraudt, David and Hohm, Anna and Hein, Rebecca and Grundgeiger, Tobias and Happel, Oliver}, booktitle = {Proceedings of the 63rd Annual Meeting of the Human Factors and Ergonomics Society}, keywords = {ewolf myown}, title = {Rapid Preparation of Eye Tracking Data for Debriefung in Medical Training: A Feasibility Study}, year = {2019, to appear} }

2019 [ nach oben ]

• Wassermann, S., Seufert, M., Casas, P., Li, G., Kuang, L.: I See What you See: Real Time Prediction of Video Quality from Encrypted Streaming Traffic. 4th Workshop on QoE-based Analysis and Management of Data Communication Networks (Internet-QoE). , Los Cabos, Mexico (2019).
  [ Abstract ] [ BibTeX ]
   
  We address the problem of real-time QoE monitoring of HAS, from the ISP perspective, focusing in particular on videoresolution analysis. Given the wide adoption of end-to-end encryption, we resort to machine-learning models to predict different video resolution levels in a fine-grained scale, ranging from 144p to 1080p resolution, using as input only packet-level data. The proposed measurement system performs predictions in real time, during the course of an ongoing video-streaming session, with a time granularity as small as one second. We consider the particular case of YouTube video streaming. Empirical evaluations on a large and heterogeneous corpus of YouTube measurements demonstrate that the proposed system can predict video resolution with very high accuracy, and in real time. Different from state of the art, the prediction task is not bound to coarse-grained video quality classes and does not require chunk-detection approaches for feature extraction.
  @inproceedings{info3-inproceedings-2019-28, abstract = {We address the problem of real-time QoE monitoring of HAS, from the ISP perspective, focusing in particular on videoresolution analysis. Given the wide adoption of end-to-end encryption, we resort to machine-learning models to predict different video resolution levels in a fine-grained scale, ranging from 144p to 1080p resolution, using as input only packet-level data. The proposed measurement system performs predictions in real time, during the course of an ongoing video-streaming session, with a time granularity as small as one second. We consider the particular case of YouTube video streaming. Empirical evaluations on a large and heterogeneous corpus of YouTube measurements demonstrate that the proposed system can predict video resolution with very high accuracy, and in real time. Different from state of the art, the prediction task is not bound to coarse-grained video quality classes and does not require chunk-detection approaches for feature extraction.}, address = {Los Cabos, Mexico}, author = {Wassermann, Sarah and Seufert, Michael and Casas, Pedro and Li, Gang and Kuang, Li}, booktitle = {4th Workshop on QoE-based Analysis and Management of Data Communication Networks (Internet-QoE)}, keywords = {myown ua-net}, month = 10, title = {I See What you See: Real Time Prediction of Video Quality from Encrypted Streaming Traffic}, year = 2019 }
• Maggi, L., Leguay, J., Seufert, M., Casas, P.: Online Detection of Stalling and Scrubbing in Adaptive Video Streaming. 17th International Symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks (WiOpt). , Avignon, France (2019).
  [ BibTeX ]
   
  @inproceedings{info3-inproceedings-2019-12, address = {Avignon, France}, author = {Maggi, Lorenzo and Leguay, Jeremy and Seufert, Michael and Casas, Pedro}, booktitle = {17th International Symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks (WiOpt)}, keywords = {myown net-man}, month = 6, title = {Online Detection of Stalling and Scrubbing in Adaptive Video Streaming}, year = 2019 }
• Seufert, M.: Fundamental Advantages of Considering Quality of Experience Distributions over Mean Opinion Scores. 11th International Conference on Quality of Multimedia Experience (QoMEX). , Berlin, Germany (2019).
  [ BibTeX ]
   
  @inproceedings{info3-inproceedings-2019-14, address = {Berlin, Germany}, author = {Seufert, Michael}, booktitle = {11th International Conference on Quality of Multimedia Experience (QoMEX)}, keywords = {myown ua-net}, month = 6, title = {Fundamental Advantages of Considering Quality of Experience Distributions over Mean Opinion Scores}, year = 2019 }
• Seufert, M., Wehner, N., Casas, P.: A Fair Share for All: TCP-inspired Adaptation Logic for QoE Fairness among Heterogeneous HTTP Adaptive Video Streaming Clients. IEEE Transactions on Network and Service Management. 16, 475-488 (2019).
  [ BibTeX ]
   
  @article{info3-article-2019-4, author = {Seufert, Michael and Wehner, Nikolas and Casas, Pedro}, journal = {IEEE Transactions on Network and Service Management}, keywords = {myown net-man}, month = 6, number = 2, pages = {475-488}, title = {A Fair Share for All: TCP-inspired Adaptation Logic for QoE Fairness among Heterogeneous HTTP Adaptive Video Streaming Clients}, volume = 16, year = 2019 }
• Supervisor: Seufert, M.: Transfer Learning Approaches for QoE Monitoring of Encrypted Video Streaming Traffic, (2019).
  [ Abstract ] [ BibTeX ]
   
  Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Transfer Learning Approaches 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, 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: Transferlernverfahren 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, 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 Approaches 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, 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: Transferlernverfahren 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, 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 Approaches for QoE Monitoring of Encrypted Video Streaming Traffic}, year = 2019 }
• Mizrachi, E., Schwartz, R., Spoerhase, J., Uniyal, S.: A Tight Approximation for Submodular Maximization with Mixed Packing and Covering Constraints. Proc. 46th International Colloquium on Automata, Languages and Programming (ICALP'19) (2019).
  [ BibTeX ] [ URL ]
   
  @inproceedings{mizrachi-etal19:submodular-mixed, author = {Mizrachi, Eyal and Schwartz, Roy and Spoerhase, Joachim and Uniyal, Sumedha}, booktitle = {Proc. 46th International Colloquium on Automata, Languages and Programming (ICALP'19)}, keywords = {approximability covering key myown packing submodular}, note = {to appear}, title = {A Tight Approximation for Submodular Maximization with Mixed Packing and Covering Constraints}, year = 2019 }
• Nogatz, F., Seipel, D., Abreu, S.: Definite Clause Grammars with Parse Trees: Extension for Prolog. Proceedings of 8th Symposium on Languages, Applications, Technologies (SLATE). S. 7:1-7:14 (2019).
  [ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
   
  Definite Clause Grammars (DCGs) are a convenient way to specify possibly non-context-free grammars for natural and formal languages. They can be used to progressively build a parse tree as grammar rules are applied by providing an extra argument in the DCG rule’s head. In the simplest way, this is a structure that contains the name of the used nonterminal. This extension of a DCG has been proposed for natural language processing in the past and can be done automatically in Prolog using term expansion. We extend this approach by a meta-nonterminal to specify optional and sequences of nonterminals, as these structures are common in grammars for formal, domain-specific languages. We specify a term expansion that represents these sequences as lists while preserving the grammar’s ability to be used both for parsing and serialising, i.e. to create a parse tree by a given source code and vice-versa. We show that this mechanism can be used to lift grammars specified in extended Backus–Naur form (EBNF) to generate parse trees. As a case study, we present a parser for the Prolog programming language itself based only on the grammars given in the ISO Prolog standard which produces corresponding parse trees.
  @inproceedings{nogatz2019dcg4pt, abstract = {Definite Clause Grammars (DCGs) are a convenient way to specify possibly non-context-free grammars for natural and formal languages. They can be used to progressively build a parse tree as grammar rules are applied by providing an extra argument in the DCG rule’s head. In the simplest way, this is a structure that contains the name of the used nonterminal. This extension of a DCG has been proposed for natural language processing in the past and can be done automatically in Prolog using term expansion. We extend this approach by a meta-nonterminal to specify optional and sequences of nonterminals, as these structures are common in grammars for formal, domain-specific languages. We specify a term expansion that represents these sequences as lists while preserving the grammar’s ability to be used both for parsing and serialising, i.e. to create a parse tree by a given source code and vice-versa. We show that this mechanism can be used to lift grammars specified in extended Backus–Naur form (EBNF) to generate parse trees. As a case study, we present a parser for the Prolog programming language itself based only on the grammars given in the ISO Prolog standard which produces corresponding parse trees.}, author = {Nogatz, Falco and Seipel, Dietmar and Abreu, Salvador}, booktitle = {Proceedings of 8th Symposium on Languages, Applications, Technologies (SLATE)}, keywords = {myown}, pages = {7:1-7:14}, series = {OpenAccess Series in Informatics (OASIcs)}, title = {Definite Clause Grammars with Parse Trees: Extension for Prolog}, volume = 74, year = 2019 }
• Seufert, M., Wassermann, S., Casas, P.: Considering User Behavior in the Quality of Experience Cycle: Towards Proactive QoE-aware Traffic Management. IEEE Communications Letters. 23, 1145-1148 (2019).
  [ Abstract ] [ BibTeX ]
   
  The concept of Quality of Experience (QoE) of Internet services is widely recognized by service providers and network operators. They strive to deliver the best experience to their customers in order to increase revenues and avoid churn. Therefore, QoE is increasingly considered as an integral part of the reactive traffic management cycle of network operators. Additionally, QoE also constitutes a cycle of its own, which includes the user behavior and the service requirements. This work describes this QoE cycle, which is not widely taken into account yet, discusses the interactions of the two cycles, and derives implications towards an improved and proactive QoE-aware traffic management. A showcase on how network operators can obtain hints on the change of network requirements from detecting user behavior in encrypted video traffic is also presented in this paper.
  @article{info3-article-2019-5, abstract = {The concept of Quality of Experience (QoE) of Internet services is widely recognized by service providers and network operators. They strive to deliver the best experience to their customers in order to increase revenues and avoid churn. Therefore, QoE is increasingly considered as an integral part of the reactive traffic management cycle of network operators. Additionally, QoE also constitutes a cycle of its own, which includes the user behavior and the service requirements. This work describes this QoE cycle, which is not widely taken into account yet, discusses the interactions of the two cycles, and derives implications towards an improved and proactive QoE-aware traffic management. A showcase on how network operators can obtain hints on the change of network requirements from detecting user behavior in encrypted video traffic is also presented in this paper.}, author = {Seufert, Michael and Wassermann, Sarah and Casas, Pedro}, journal = {IEEE Communications Letters}, keywords = {myown ua-net}, month = 7, number = 7, pages = {1145-1148}, title = {Considering User Behavior in the Quality of Experience Cycle: Towards Proactive QoE-aware Traffic Management}, volume = 23, year = 2019 }
• Obremski, D., Lugrin, J.-L., Schaper, P., Lugrin, B.: Non-Native Speaker Generation and Perception for Mixed-Cultural Settings. ACM International Conference on Intelligent Virtual Agents 2019. (2019).
  [ Abstract ] [ BibTeX ] [ DOI ]
   
  This paper presents an experiment evaluating the effects of virtual agents' language proficiency on whether they are perceived as a native speakers or not. Our first results indicate that beyond 10% word order mistakes and 25% infinitive mistakes, virtual agents are perceived as non-native speakers, even though their appearance and non-verbal behaviour were not altered. We believe these thresholds constitute interesting guidelines possibly simplifying the design of non-native speaker simulations.
  @article{obremski2019nonnative, abstract = {This paper presents an experiment evaluating the effects of virtual agents' language proficiency on whether they are perceived as a native speakers or not. Our first results indicate that beyond 10% word order mistakes and 25% infinitive mistakes, virtual agents are perceived as non-native speakers, even though their appearance and non-verbal behaviour were not altered. We believe these thresholds constitute interesting guidelines possibly simplifying the design of non-native speaker simulations.}, author = {Obremski, David and Lugrin, Jean-Luc and Schaper, Philipp and Lugrin, Birgit}, journal = {ACM International Conference on Intelligent Virtual Agents 2019}, keywords = {IVA birgit lugrin mi myown obremski schaper}, publisher = {ACM}, title = {Non-Native Speaker Generation and Perception for Mixed-Cultural Settings}, year = 2019 }
• Maiwald, F., Henze, F., Bruschke, J., Niebling, F.: GEO-INFORMATION TECHNOLOGIES FOR A MULTIMODAL ACCESS ON HISTORICAL PHOTOGRAPHS AND MAPS FOR RESEARCH AND COMMUNICATION IN URBAN HISTORY. ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. XLII-2/W11, 763--769 (2019).
  [ BibTeX ] [ URL ] [ DOI ]
   
  @article{isprs-archives-XLII-2-W11-763-2019, author = {Maiwald, F. and Henze, F. and Bruschke, J. and Niebling, F.}, journal = {ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences}, keywords = {histstadt4d myown niebling}, note = {2nd International Conference of Geomatics and Restoration. Best paper award. 🏆}, pages = {763--769}, title = {GEO-INFORMATION TECHNOLOGIES FOR A MULTIMODAL ACCESS ON HISTORICAL PHOTOGRAPHS AND MAPS FOR RESEARCH AND COMMUNICATION IN URBAN HISTORY}, volume = {XLII-2/W11}, year = 2019 }
• Stulier, N.: Viability of VNF Offloading in P4, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-praktikum-2019-8, author = {Stulier, Norman}, keywords = {myown p4 ngn}, school = {Universität Würzburg}, title = {Viability of VNF Offloading in P4}, year = 2019 }
• Ott, S.: Design and Performance Evaluation of NMS-aware SDN Controle Plane Mechanisms, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-bachelor-2019-8, author = {Ott, Stefan}, keywords = {myown}, month = 5, school = {Universität Würzburg}, title = {Design and Performance Evaluation of NMS-aware SDN Controle Plane Mechanisms}, year = 2019 }
• Nogatz, F., Kübert, J., Seipel, D., Abreu, S.: Alexa, How Can I Reason with Prolog? Proceedings of 8th Symposium on Languages, Applications, Technologies (SLATE). S. 17:1-17:9 (2019).
  [ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
   
  As with Amazon’s Echo and its conversational agent Alexa, smart voice-controlled devices become ever more present in daily life, and many different applications can be integrated into this platform. In this paper, we present a framework that eases the development of skills in Prolog. As Prolog has a long history in natural language processing, we may integrate well-established techniques, such as reasoning about knowledge with Attempto Controlled English, instead of depending on example phrases and pre-defined slots.
  @inproceedings{nogatz2019alexa, abstract = {As with Amazon’s Echo and its conversational agent Alexa, smart voice-controlled devices become ever more present in daily life, and many different applications can be integrated into this platform. In this paper, we present a framework that eases the development of skills in Prolog. As Prolog has a long history in natural language processing, we may integrate well-established techniques, such as reasoning about knowledge with Attempto Controlled English, instead of depending on example phrases and pre-defined slots.}, author = {Nogatz, Falco and Kübert, Julia and Seipel, Dietmar and Abreu, Salvador}, booktitle = {Proceedings of 8th Symposium on Languages, Applications, Technologies (SLATE)}, keywords = {myown}, pages = {17:1-17:9}, series = {OpenAccess Series in Informatics (OASIcs)}, title = {Alexa, How Can I Reason with Prolog?}, volume = 74, year = 2019 }
• Hoßfeld, T., Atzori, L., Heegaard, P.E., Skorin-Kapov, L., Varela, M.: The Interplay between QoE, User Behavior and System Blocking in QoE Management. 22nd Conference on Innovation in Clouds, Internet and Networks and Workshops (ICIN) (2019).
  [ BibTeX ]
   
  @inproceedings{info3-inproceedings-2019-15, author = {Hoßfeld, Tobias and Atzori, Luigi and Heegaard, Poul E. and Skorin-Kapov, Lea and Varela, Martin}, booktitle = {22nd Conference on Innovation in Clouds, Internet and Networks and Workshops (ICIN)}, keywords = {myown}, title = {The Interplay between QoE, User Behavior and System Blocking in QoE Management}, year = 2019 }
• Grigorjew, A., Metzger, F., Hoßfeld, T., Specht, J.: A Simulation of Asynchronous Traffic Shapers in Switched Ethernet Networks. Workshop for Advanced Communication Networks for Industrial Applications (2019).
  [ Abstract ] [ BibTeX ]
   
  As the requirements of real-time networking in- crease, the IEEE Time-Sensitive Networking (TSN) task group is working on new standards for high bandwidth and low latency Ethernet switching. In particular, the upcoming P802.1Qcr standard features Asynchronous Traffic Shaping (ATS), which is a promising approach for real-time networks with high dynamics and critical safety requirements. Additionally, parallel concepts such as frame preemption can be used to reduce delays even further. This work presents a discrete event simulation framework that can analyze the performance of these concepts. It implements frame preemption and multiple shaping algorithms, while recording latency and queue utilization statistics at the switches. In addition, an evaluation of a linear topology with four switches is performed under high link utilization, which demonstrates the benefit of the above mechanisms compared to regular Ethernet switching.
  @inproceedings{info3-inproceedings-2019-16, abstract = {As the requirements of real-time networking in- crease, the IEEE Time-Sensitive Networking (TSN) task group is working on new standards for high bandwidth and low latency Ethernet switching. In particular, the upcoming P802.1Qcr standard features Asynchronous Traffic Shaping (ATS), which is a promising approach for real-time networks with high dynamics and critical safety requirements. Additionally, parallel concepts such as frame preemption can be used to reduce delays even further. This work presents a discrete event simulation framework that can analyze the performance of these concepts. It implements frame preemption and multiple shaping algorithms, while recording latency and queue utilization statistics at the switches. In addition, an evaluation of a linear topology with four switches is performed under high link utilization, which demonstrates the benefit of the above mechanisms compared to regular Ethernet switching.}, author = {Grigorjew, Alexej and Metzger, Florian and Hoßfeld, Tobias and Specht, Johannes}, booktitle = {Workshop for Advanced Communication Networks for Industrial Applications}, keywords = {myown ats-performance fullstack ngn 5g-net}, month = 3, title = {A Simulation of Asynchronous Traffic Shapers in Switched Ethernet Networks}, year = 2019 }
• Rosenberger, A.: Using In-Band Network Telemetry for Automatic QoS Optimization in SDNs, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-praktikum-2019-7, author = {Rosenberger, Andreas}, keywords = {myown p4 ngn}, school = {Universität Würzburg}, title = {Using In-Band Network Telemetry for Automatic QoS Optimization in SDNs}, year = 2019 }
• Seufert, M., Schatz, R., Wehner, N., Gardlo, B., Casas, P.: Is QUIC becoming the New TCP? On the Potential Impact of a New Protocol on Networked Multimedia QoE. 11th International Conference on Quality of Multimedia Experience (QoMEX). , Berlin, Germany (2019).
  [ BibTeX ]
   
  @inproceedings{info3-inproceedings-2019-13, address = {Berlin, Germany}, author = {Seufert, Michael and Schatz, Raimund and Wehner, Nikolas and Gardlo, Bruno and Casas, Pedro}, booktitle = {11th International Conference on Quality of Multimedia Experience (QoMEX)}, keywords = {myown ua-net net-man}, month = 6, title = {Is QUIC becoming the New TCP? On the Potential Impact of a New Protocol on Networked Multimedia QoE}, year = 2019 }
• Seufert, M., Casas, P., Wehner, N., Li, G., Kuang, L.: Features that Matter: Feature Selection for On-line Stalling Prediction in Encrypted Video Streaming. 2nd International Workshop on Network Intelligence (NI). , Paris, France (2019).
  [ BibTeX ]
   
  @inproceedings{info3-inproceedings-2019-11, address = {Paris, France}, author = {Seufert, Michael and Casas, Pedro and Wehner, Nikolas and Li, Gang and Kuang, Li}, booktitle = {2nd International Workshop on Network Intelligence (NI)}, keywords = {myown net-man}, month = 4, title = {Features that Matter: Feature Selection for On-line Stalling Prediction in Encrypted Video Streaming}, year = 2019 }
• Tönsing, L.: Untersuchung des Einflusses der Anleitungs- und Bearbeitungssprache auf die Ergebnisqualität von Crowdsourcing-Aufgaben, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-praktikum-2019-6, author = {Tönsing, Lukas}, keywords = {myown}, month = 5, school = {Universitiy of Würzburg}, title = {Untersuchung des Einflusses der Anleitungs- und Bearbeitungssprache auf die Ergebnisqualität von Crowdsourcing-Aufgaben}, year = 2019 }
• Seufert, M.: QUICker or not? - an Empirical Analysis of QUIC vs TCP for Video Streaming QoE Provisioning. , 3rd International Workshop on Quality of Experience Management (QoE-Management), Paris, France (2019).
  [ BibTeX ]
   
  @presentation{info3-presentation-2019-1, address = {3rd International Workshop on Quality of Experience Management (QoE-Management), Paris, France}, author = {Seufert, Michael}, keywords = {myown}, month = 2, title = {QUICker or not? - an Empirical Analysis of QUIC vs TCP for Video Streaming QoE Provisioning}, year = 2019 }
• Metzger, F., Hoßfeld, T., Bauer, A., Kounev, S., Heegaard, P.E.: Modeling of Aggregated IoT Traffic and Its Application to an IoT Cloud. Proceedings of the IEEE. 107, 679-694 (2019).
  [ Abstract ] [ BibTeX ]
   
  As the Internet of Things (IoT) continues to gain traction in telecommunication networks, a very large number of devices are expected to be connected and used in the near future. In order to appropriately plan and dimension the network, as well as the back-end cloud systems and the resulting signaling load, traffic models are employed. These models are designed to accurately capture and predict the properties of IoT traffic in a concise manner. To achieve this, Poisson process approximations, based on the Palm–Khintchine theorem, have often been used in the past. Due to the scale (and the difference in scales in various IoT networks) of the modeled systems, the fidelity of this approximation is crucial, as, in practice, it is very challenging to accurately measure or simulate large-scale IoT deployments. The main goal of this paper is to understand the level of accuracy of the Poisson approximation model. To this end, we first survey both common IoT network properties and network scales as well as traffic types. Second, we explain and discuss the Palm–Khintiche theorem, how it is applied to the problem, and which inaccuracies can occur when using it. Based on this, we derive guidelines as to when a Poisson process can be assumed for aggregated periodic IoT traffic. Finally, we evaluate our approach in the context of an IoT cloud scaler use case.
  @article{info3-article-2019-3, abstract = {As the Internet of Things (IoT) continues to gain traction in telecommunication networks, a very large number of devices are expected to be connected and used in the near future. In order to appropriately plan and dimension the network, as well as the back-end cloud systems and the resulting signaling load, traffic models are employed. These models are designed to accurately capture and predict the properties of IoT traffic in a concise manner. To achieve this, Poisson process approximations, based on the Palm–Khintchine theorem, have often been used in the past. Due to the scale (and the difference in scales in various IoT networks) of the modeled systems, the fidelity of this approximation is crucial, as, in practice, it is very challenging to accurately measure or simulate large-scale IoT deployments. The main goal of this paper is to understand the level of accuracy of the Poisson approximation model. To this end, we first survey both common IoT network properties and network scales as well as traffic types. Second, we explain and discuss the Palm–Khintiche theorem, how it is applied to the problem, and which inaccuracies can occur when using it. Based on this, we derive guidelines as to when a Poisson process can be assumed for aggregated periodic IoT traffic. Finally, we evaluate our approach in the context of an IoT cloud scaler use case.}, author = {Metzger, Florian and Hoßfeld, Tobias and Bauer, André and Kounev, Samuel and Heegaard, Poul E.}, journal = {Proceedings of the IEEE}, keywords = {myown fullstack 5g-net doi:10.1109/JPROC.2019.2901578}, month = 4, number = 4, pages = {679-694}, title = {Modeling of Aggregated IoT Traffic and Its Application to an IoT Cloud}, volume = 107, year = 2019 }
• Alissa, A., Bentalab, A., Zinner, T., Ghita, B., Mkwawa, I.-H.: BBGDASH: A Max-Min Bounded Bitrate Guidance for SDN Enabled Adaptive Video Streaming. 22nd Conference on Innovation in Clouds, Internet and Networks and Workshops (ICIN (2019).
  [ BibTeX ]
   
  @inproceedings{info3-inproceedings-2019-2, author = {Alissa, Ali and Bentalab, Abdelhak and Zinner, Thomas and Ghita, Bogdan and Mkwawa, Is-Haka}, booktitle = {22nd Conference on Innovation in Clouds, Internet and Networks and Workshops (ICIN}, keywords = {myown}, month = 2, title = {BBGDASH: A Max-Min Bounded Bitrate Guidance for SDN Enabled Adaptive Video Streaming}, year = 2019 }
• Schwind, A., Janiak, L., Moldovan, C., Wamser, F., Hoßfeld, T.: Peeking under the Hood – How the Measurement Setup Influences the Video Streaming Behavior. The 3rd International Workshop on Quality of Experience Management (QoE-Management 2019). , Paris, France (2019).
  [ Abstract ] [ BibTeX ]
   
  Global Internet video traffic will dramatically increase in the next years. With this rapid growth, interest in the application behavior of video streaming services and the resulting user experience rises. In particular, there is a need to understand the influence of system parameters on the streaming performance. Thus, several monitoring approaches have been developed which allow conducting automated measurements on a large-scale, for example, lightweight approaches for measurements running in the mobile networks or setups using a virtual frame buffer for servers without a display running in virtualized cloud environments. In some cases, the measurement hardware can totally be controlled, in other cases, there is no knowledge about parallel running services. In this paper, we answer the question whether and how much the measurement setup (e.g., virtualization, headless browsers, load on machines) influences the video streaming behavior. Therefore, we compare eight management setups with the ground truth (an end user watching a video on the own device) by evaluating the key performance indicators on application layer during video streaming, i.e. initial video playout delays and stalling. Our results reveal important insights: some of the common measurement setups heavily influence the measurements and must be avoided to collect reliable results.
  @inproceedings{info3-inproceedings-2019-6, abstract = {Global Internet video traffic will dramatically increase in the next years. With this rapid growth, interest in the application behavior of video streaming services and the resulting user experience rises. In particular, there is a need to understand the influence of system parameters on the streaming performance. Thus, several monitoring approaches have been developed which allow conducting automated measurements on a large-scale, for example, lightweight approaches for measurements running in the mobile networks or setups using a virtual frame buffer for servers without a display running in virtualized cloud environments. In some cases, the measurement hardware can totally be controlled, in other cases, there is no knowledge about parallel running services. In this paper, we answer the question whether and how much the measurement setup (e.g., virtualization, headless browsers, load on machines) influences the video streaming behavior. Therefore, we compare eight management setups with the ground truth (an end user watching a video on the own device) by evaluating the key performance indicators on application layer during video streaming, i.e. initial video playout delays and stalling. Our results reveal important insights: some of the common measurement setups heavily influence the measurements and must be avoided to collect reliable results.}, address = {Paris, France}, author = {Schwind, Anika and Janiak, Lea and Moldovan, Christian and Wamser, Florian and Hoßfeld, Tobias}, booktitle = {The 3rd International Workshop on Quality of Experience Management (QoE-Management 2019)}, keywords = {myown can ua-net}, month = 2, title = {Peeking under the Hood – How the Measurement Setup Influences the Video Streaming Behavior}, year = 2019 }
• Seufert, M., Casas, P., Wehner, N., Li, G., Kuang, L.: Stream-based Machine Learning for Real-time QoE Analysis of Encrypted Video Streaming Traffic. 3rd International Workshop on Quality of Experience Management (QoE-Management). , Paris, France (2019).
  [ Abstract ] [ BibTeX ]
   
  As stalling is the worst Quality of Experience (QoE) degradation of HTTP adaptive video streaming (HAS), this work presents a stream-based machine learning approach, ViCrypt, which analyzes stalling of YouTube streaming sessions in real-time from encrypted network traffic. The video streaming session is subdivided into a stream of short time slots of 1 s length, while considering two additional macro windows each for the current streaming trend and the whole ongoing streaming session. Constant memory features are extracted from the encrypted network traffic in these three windows in a stream-based fashion, and fed into a random forest model, which predicts whether the current time slot contains stalling or not. The presented system can predict stalling with a very high accuracy and the finest granularity to date (1 s), and thus, can be used in networks for real-time QoE analysis from encrypted YouTube video streaming traffic. The independent predictions for each consecutive slot of a streaming session can further be aggregated to obtain stalling estimations for the whole session. Thereby, the proposed method allows to quantify the initial delay, as well as the overall number of stalling events and the stalling ratio, i.e., the ratio of total stalling time and total playback time.
  @inproceedings{info3-inproceedings-2019-8, abstract = {As stalling is the worst Quality of Experience (QoE) degradation of HTTP adaptive video streaming (HAS), this work presents a stream-based machine learning approach, ViCrypt, which analyzes stalling of YouTube streaming sessions in real-time from encrypted network traffic. The video streaming session is subdivided into a stream of short time slots of 1 s length, while considering two additional macro windows each for the current streaming trend and the whole ongoing streaming session. Constant memory features are extracted from the encrypted network traffic in these three windows in a stream-based fashion, and fed into a random forest model, which predicts whether the current time slot contains stalling or not. The presented system can predict stalling with a very high accuracy and the finest granularity to date (1 s), and thus, can be used in networks for real-time QoE analysis from encrypted YouTube video streaming traffic. The independent predictions for each consecutive slot of a streaming session can further be aggregated to obtain stalling estimations for the whole session. Thereby, the proposed method allows to quantify the initial delay, as well as the overall number of stalling events and the stalling ratio, i.e., the ratio of total stalling time and total playback time.}, address = {Paris, France}, author = {Seufert, Michael and Casas, Pedro and Wehner, Nikolas and Li, Gang and Kuang, Li}, booktitle = {3rd International Workshop on Quality of Experience Management (QoE-Management)}, keywords = {myown net-man}, month = 2, title = {Stream-based Machine Learning for Real-time QoE Analysis of Encrypted Video Streaming Traffic}, year = 2019 }
• Lange, S., Linguaglossa, L., Geißler, S., Rossi, D., Zinner, T.: Discrete-Time Modeling of NFV Accelerators that Exploit Batched Processing. IEEE Conference on Computer Communications (Infocom) (2019).
  [ BibTeX ]
   
  @inproceedings{info3-inproceedings-2019-4, author = {Lange, Stanislav and Linguaglossa, Leonardo and Geißler, Stefan and Rossi, Dario and Zinner, Thomas}, booktitle = {IEEE Conference on Computer Communications (Infocom)}, keywords = {myown sendate sendate-planets 5g-net}, month = 4, title = {Discrete-Time Modeling of NFV Accelerators that Exploit Batched Processing}, year = 2019 }
• Supervisor: Wehner, N.: Fingerprinting Websites in Encrypted Network Traffic, (2019).
  [ Abstract ] [ BibTeX ]
   
  Contact/Kontakt: nikolas.wehner@informatik.uni-wuerzburg.de 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 afterwards they have to be ingested into selected Machine Learning algorithms.
  @mastersthesis{info3-master-2019-10, abstract = {Contact/Kontakt: nikolas.wehner@informatik.uni-wuerzburg.de 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 afterwards they have to be ingested into selected Machine Learning algorithms.}, author = {Supervisor: Wehner, Nikolas}, keywords = {myown}, school = {University of Würzburg}, title = {Fingerprinting Websites in Encrypted Network Traffic}, year = 2019 }
• Supervisor: Schwind, A.: Potential Traffic Savings by Leveraging Proximity of Communication Groups in Mobile Messaging, (2019).
  [ Abstract ] [ BibTeX ]
   
  Contact: anika.schwind@informatik.uni-wuerzburg.de
  @mastersthesis{info3-bachelor-2018-10, abstract = {Contact: anika.schwind@informatik.uni-wuerzburg.de}, author = {Supervisor: Schwind, Anika}, keywords = {myown}, school = {University of Würzburg}, title = {Potential Traffic Savings by Leveraging Proximity of Communication Groups in Mobile Messaging}, year = 2019 }
• Hildebrand, K.: Towards a Source Traffic Model for Instant Messaging using WhatsApp, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-bachelor-2018-11, author = {Hildebrand, Kathrin}, keywords = {myown}, month = 7, school = {University of Würzburg}, title = {Towards a Source Traffic Model for Instant Messaging using WhatsApp}, year = 2019 }
• Enghardt, T., Zinner, T., Feldmann, A.: Web Performance Pitfalls. Passive and Active Measurement Conference (PAM) (2019).
  [ BibTeX ]
   
  @inproceedings{info3-inproceedings-2019-1, author = {Enghardt, Theresa and Zinner, Thomas and Feldmann, Anja}, booktitle = {Passive and Active Measurement Conference (PAM)}, keywords = {myown}, month = 3, title = {Web Performance Pitfalls}, year = 2019 }
• Schwarzmann, S., Breitbach, P., Zinner, T.: Computing QoE-relevant Adaptive Video Streaming Metrics using Discrete-Time Analysis. Third International Workshop on Quality of Experience Management 2019 (2019).
  [ BibTeX ]
   
  @inproceedings{info3-inproceedings-2019-3, author = {Schwarzmann, Susanna and Breitbach, Paula and Zinner, Thomas}, booktitle = {Third International Workshop on Quality of Experience Management 2019}, keywords = {myown dfg-sdn}, month = 2, title = {Computing QoE-relevant Adaptive Video Streaming Metrics using Discrete-Time Analysis}, year = 2019 }
• Seufert, M., Schatz, R., Wehner, N., Casas, P.: QUICker or not? - an Empirical Analysis of QUIC vs TCP for Video Streaming QoE Provisioning. 3rd International Workshop on Quality of Experience Management (QoE-Management). , Paris, France (2019).
  [ Abstract ] [ BibTeX ]
   
  The introduction of the QUIC (Quick UDP Internet Connections) transport protocol by Google aimed to improve the Quality of Experience (QoE) with web services compared to the prevailing Transport Control Protocol (TCP). Nowadays, QUIC has become the default protocol to communicate between the Google Chrome browser and Google servers and accounts for an increasing share of the Internet traffic. This work investigates whether the promised QoE benefits of QUIC are indeed noticeable for end users or not. A measurement study was conducted for YouTube video streaming in two mobile and two fixed access networks, in which a defined set of videos was streamed back-to-back with QUIC and TCP in randomized order. QoE factors of video streaming (such as initial delay, the visual quality of the video, and stalling) were compared statistically to find significant differences between the streaming over QUIC and the streaming over TCP. Surprisingly, no evidence for any QoE improvement of QUIC over TCP in the context of YouTube streaming could be found.
  @inproceedings{info3-inproceedings-2019-7, abstract = {The introduction of the QUIC (Quick UDP Internet Connections) transport protocol by Google aimed to improve the Quality of Experience (QoE) with web services compared to the prevailing Transport Control Protocol (TCP). Nowadays, QUIC has become the default protocol to communicate between the Google Chrome browser and Google servers and accounts for an increasing share of the Internet traffic. This work investigates whether the promised QoE benefits of QUIC are indeed noticeable for end users or not. A measurement study was conducted for YouTube video streaming in two mobile and two fixed access networks, in which a defined set of videos was streamed back-to-back with QUIC and TCP in randomized order. QoE factors of video streaming (such as initial delay, the visual quality of the video, and stalling) were compared statistically to find significant differences between the streaming over QUIC and the streaming over TCP. Surprisingly, no evidence for any QoE improvement of QUIC over TCP in the context of YouTube streaming could be found.}, address = {Paris, France}, author = {Seufert, Michael and Schatz, Raimund and Wehner, Nikolas and Casas, Pedro}, booktitle = {3rd International Workshop on Quality of Experience Management (QoE-Management)}, keywords = {myown ua-net net-man}, month = 2, title = {QUICker or not? - an Empirical Analysis of QUIC vs TCP for Video Streaming QoE Provisioning}, year = 2019 }
• Geißler, S., Lange, S., Wamser, F., Zinner, T., Hoßfeld, T.: KOMon - Kernel-based Online Monitoring of VNF Packet Processing Times. 2019 International Conference on Networked Systems (NetSys), Best Paper Award (2019).
  [ BibTeX ]
   
  @inproceedings{info3-inproceedings-2019-5, author = {Geißler, Stefan and Lange, Stanislav and Wamser, Florian and Zinner, Thomas and Hoßfeld, Tobias}, booktitle = {2019 International Conference on Networked Systems (NetSys), Best Paper Award}, keywords = {myown sendate sendate-planets ngn 5g-net}, month = 3, title = {KOMon - Kernel-based Online Monitoring of VNF Packet Processing Times}, year = 2019 }
• Baumeister, J.: Experience-based Quality Assessment of Distributed Knowledge Graphs. WM 2019 - 10te Konferenz Professionelles Wissensmanagement (2019).
  [ BibTeX ]
   
  @inproceedings{baumeister2019experiencebased, author = {Baumeister, Joachim}, booktitle = {WM 2019 - 10te Konferenz Professionelles Wissensmanagement}, keywords = {anomalies configuration evaluation myown rokt}, title = {Experience-based Quality Assessment of Distributed Knowledge Graphs}, year = 2019 }
• Sanderson, P.M., Brecknell, B., Leong, S.Y., Klueber, S., Wolf, E., Hickling, A., Tang, T.-L., Bell, E., Li, S.Y.W., Loeb, R.G.: Monitoring vital signs with time-compressed speech. Journal of Experimental Psychology: Applied. (2019).
  [ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
   
  Spearcons—time-compressed speech phrases—may be an effective way of communicating vital signs to clinicians without disturbing patients and their families. Four experiments tested the effectiveness of spearcons for conveying oxygen saturation (SpO2) and heart rate (HR) of one or more patients. Experiment 1 demonstrated that spearcons were more effective than earcons (abstract auditory motifs) at conveying clinical ranges. Experiment 2 demonstrated that casual listeners could not learn to decipher the spearcons whereas listeners told the exact vocabulary could. Experiment 3 demonstrated that participants could interpret sequences of sounds representing multiple patients better with spearcons than with pitch-based earcons, especially when tones replaced the spearcons for normal patients. Experiment 4 compared multiple-patient monitoring of two vital signs with either spearcons, a visual display showing SpO2 and HR in the same temporal sequence as the spearcons, or a visual display showing multiple patient levels simultaneously. All displays conveyed which patients were abnormal with high accuracy. Visual displays better conveyed the vital sign levels for each patient, but cannot be used eyes-free. All displays showed accuracy decrements with working memory load. Spearcons may be viable for single and multiple patient monitoring. Further research should test spearcons with more vital signs, during multitasking, and longitudinally.
  @article{sanderson2019monitoring, abstract = {Spearcons—time-compressed speech phrases—may be an effective way of communicating vital signs to clinicians without disturbing patients and their families. Four experiments tested the effectiveness of spearcons for conveying oxygen saturation (SpO2) and heart rate (HR) of one or more patients. Experiment 1 demonstrated that spearcons were more effective than earcons (abstract auditory motifs) at conveying clinical ranges. Experiment 2 demonstrated that casual listeners could not learn to decipher the spearcons whereas listeners told the exact vocabulary could. Experiment 3 demonstrated that participants could interpret sequences of sounds representing multiple patients better with spearcons than with pitch-based earcons, especially when tones replaced the spearcons for normal patients. Experiment 4 compared multiple-patient monitoring of two vital signs with either spearcons, a visual display showing SpO2 and HR in the same temporal sequence as the spearcons, or a visual display showing multiple patient levels simultaneously. All displays conveyed which patients were abnormal with high accuracy. Visual displays better conveyed the vital sign levels for each patient, but cannot be used eyes-free. All displays showed accuracy decrements with working memory load. Spearcons may be viable for single and multiple patient monitoring. Further research should test spearcons with more vital signs, during multitasking, and longitudinally.}, author = {Sanderson, Penelope M. and Brecknell, Birgit and Leong, SokYee and Klueber, Sara and Wolf, Erik and Hickling, Anna and Tang, Tsz-Lok and Bell, Emilea and Li, Simon Y. W. and Loeb, Robert G.}, journal = {Journal of Experimental Psychology: Applied}, keywords = {ewolf myown}, title = {Monitoring vital signs with time-compressed speech}, year = 2019 }
• Klueber, S., Wolf, E., Grundgeiger, T., Brecknell, B., Mohamed, I., Sanderson, P.M.: Head-Worn Displays and Spearcons: Supporting Multiple Patient Monitoring. Applied Ergonomics. 78, 86-96 (2019).
  [ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
   
  In hospitals, clinicians often need to monitor several patients while performing other tasks. However, visual displays that show patientsu0027 vital signs are in fixed locations and auditory alarms intended to alert clinicians may be missed. Information such as spearcons (time-compressed speech earcons) that ‘travels’ with the clinician and is delivered by earpiece and/or head-worn displays (HWDs), might overcome these problems. In this study, non-clinicians monitored five simulated patients in three 10-min scenarios while performing a demanding tracking task. Monitoring accuracy was better for participants using spearcons and a HWD (88.7%) or a HWD alone (86.2%) than for participants using spearcons alone (74.1%). Participants using the spearcons and HWD (37.7%) performed the tracking task no differently from participants using spearcons alone (37.1%) but participants using the HWD alone performed worse overall (33.1%). The combination of both displays may be a suitable solution for monitoring multiple patients.
  @article{klueber2019headworn, abstract = {In hospitals, clinicians often need to monitor several patients while performing other tasks. However, visual displays that show patients\u0027 vital signs are in fixed locations and auditory alarms intended to alert clinicians may be missed. Information such as spearcons (time-compressed speech earcons) that ‘travels’ with the clinician and is delivered by earpiece and/or head-worn displays (HWDs), might overcome these problems. In this study, non-clinicians monitored five simulated patients in three 10-min scenarios while performing a demanding tracking task. Monitoring accuracy was better for participants using spearcons and a HWD (88.7%) or a HWD alone (86.2%) than for participants using spearcons alone (74.1%). Participants using the spearcons and HWD (37.7%) performed the tracking task no differently from participants using spearcons alone (37.1%) but participants using the HWD alone performed worse overall (33.1%). The combination of both displays may be a suitable solution for monitoring multiple patients.}, author = {Klueber, Sara and Wolf, Erik and Grundgeiger, Tobias and Brecknell, Birgit and Mohamed, Ismail and Sanderson, Penelope M.}, journal = {Applied Ergonomics}, keywords = {ewolf myown}, month = {feb}, number = {July 2019}, pages = {86-96}, title = {Head-Worn Displays and Spearcons: Supporting Multiple Patient Monitoring}, volume = 78, year = 2019 }
• Linguaglossa, L., Lange, S., Pontarelli, S., Retvari, G., Rossi, D., Zinner, T., Bificulo, R., Jarschel, M., Bianchi, G.: Survey of Performance Acceleration Techniques for Network Function Virtualization. Proceedings of the IEEE. (2019).
  [ Abstract ] [ BibTeX ]
   
  The ongoing network softwarization trend holds the promise to revolutionize network infrastructures by making them more flexible, reconfigurable, portable, and more adaptive than ever. Still, the migration from hard-coded/hardwired network functions towards their software-programmable counterparts comes along with the need for tailored optimizations and acceleration techniques, so as to avoid, or at least mitigate, the throughput/latency performance degradation with respect to fixed function network elements. The contribution of this article is twofold. First, we provide a comprehensive overview of the host-based Network Function Virtualization (NFV) ecosystem, covering a broad range of techniques, from low level hardware acceleration and bump-in-the-wire offloading approaches, to high-level software acceleration solutions, including the virtualization technique itself. Second, we derive guidelines regarding the design, development, and operation of NFV-based deployments that meet the flexibility and scalability requirements of modern communication networks.
  @article{info3-article-2019-1, abstract = {The ongoing network softwarization trend holds the promise to revolutionize network infrastructures by making them more flexible, reconfigurable, portable, and more adaptive than ever. Still, the migration from hard-coded/hardwired network functions towards their software-programmable counterparts comes along with the need for tailored optimizations and acceleration techniques, so as to avoid, or at least mitigate, the throughput/latency performance degradation with respect to fixed function network elements. The contribution of this article is twofold. First, we provide a comprehensive overview of the host-based Network Function Virtualization (NFV) ecosystem, covering a broad range of techniques, from low level hardware acceleration and bump-in-the-wire offloading approaches, to high-level software acceleration solutions, including the virtualization technique itself. Second, we derive guidelines regarding the design, development, and operation of NFV-based deployments that meet the flexibility and scalability requirements of modern communication networks.}, author = {Linguaglossa, Leonardo and Lange, Stanislav and Pontarelli, Salvatore and Retvari, Gabor and Rossi, Dario and Zinner, Thomas and Bificulo, Roberto and Jarschel, Michael and Bianchi, Giuseppe}, journal = {Proceedings of the IEEE}, keywords = {myown sendate sendate-planets ngn}, month = 1, title = {Survey of Performance Acceleration Techniques for Network Function Virtualization}, year = 2019 }
• Schwind, A., Midoglu, C., Alay, Ö., Griwodz, C., Wamser, F.: Dissecting the performance of YouTube video streaming in mobile networks. International Journal of Network Management. (2019).
  [ Abstract ] [ BibTeX ]
   
  Video streaming applications constitute a significant portion of the Internet traffic today, with mobile accounting for more than half of the online video views. The high share of video in the current Internet traffic mix has prompted many studies that examine video streaming through measurements. However, streaming performance depends on many different factors at different layers of the TCP/IP stack. For example, browser selection at the application layer or the choice of protocol in transport layer can have significant impact on the video performance. Furthermore, video performance heavily depends on the underlying network conditions (eg, network and link layers). For mobile networks, the conditions vary significantly, since each operator has a different deployment strategy and configuration. In this paper, we focus on YouTube and carry out a comprehensive study investigating the influence of different factors on streaming performance. Leveraging the Measuring Mobile Broadband Networks in Europe (MONROE) test bed that enables experimentation with 13 different network configurations in four countries, we collect more than 1800 measurement samples in operational mobile networks. With this campaign, our goal is to quantify the impact of parameters from different layers on YouTube's streaming quality of experience (QoE). More specifically, we analyze the role of the browser (eg, Firefox and Chrome), the impact of transport protocol (eg, TCP or QUIC), the influence of network bandwidth, and signal coverage on streaming QoE. Our analysis reveals that all these parameters need to be taken into account jointly for network management practices, in order to ensure a high end‐user experience.
  @article{info3-article-2019-2, abstract = {Video streaming applications constitute a significant portion of the Internet traffic today, with mobile accounting for more than half of the online video views. The high share of video in the current Internet traffic mix has prompted many studies that examine video streaming through measurements. However, streaming performance depends on many different factors at different layers of the TCP/IP stack. For example, browser selection at the application layer or the choice of protocol in transport layer can have significant impact on the video performance. Furthermore, video performance heavily depends on the underlying network conditions (eg, network and link layers). For mobile networks, the conditions vary significantly, since each operator has a different deployment strategy and configuration. In this paper, we focus on YouTube and carry out a comprehensive study investigating the influence of different factors on streaming performance. Leveraging the Measuring Mobile Broadband Networks in Europe (MONROE) test bed that enables experimentation with 13 different network configurations in four countries, we collect more than 1800 measurement samples in operational mobile networks. With this campaign, our goal is to quantify the impact of parameters from different layers on YouTube's streaming quality of experience (QoE). More specifically, we analyze the role of the browser (eg, Firefox and Chrome), the impact of transport protocol (eg, TCP or QUIC), the influence of network bandwidth, and signal coverage on streaming QoE. Our analysis reveals that all these parameters need to be taken into account jointly for network management practices, in order to ensure a high end‐user experience.}, author = {Schwind, Anika and Midoglu, Cise and Alay, Özgü and Griwodz, Carsten and Wamser, Florian}, journal = {International Journal of Network Management}, keywords = {myown can}, month = 1, title = {Dissecting the performance of YouTube video streaming in mobile networks}, year = 2019 }
• Latoschik, M.E., Kern, F., Stauffert, J.-P., Bartl, A., Botsch, M., Lugrin, J.-L.: Not Alone Here?! Scalability and User Experience of Embodied Ambient Crowds in Distributed Social Virtual Reality. IEEE Transactions on Visualization and Computer Graphics (TVCG). 25, 2134-2144 (2019).
  [ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
   
  This article investigates performance and user experience in Social Virtual Reality (SVR) targeting distributed, embodied, and immersive, face-to-face encounters. We demonstrate the close relationship between scalability, reproduction accuracy, and the resulting performance characteristics, as well as the impact of these characteristics on users co-located with larger groups of embodied virtual others. System scalability provides a variable number of co-located avatars and AI-controlled agents with a variety of different appearances, including realistic-looking virtual humans generated from photogrammetry scans. The article reports on how to meet the requirements of embodied SVR with todayu0027s technical off-the-shelf solutions and what to expect regarding features, performance, and potential limitations. Special care has been taken to achieve low latencies and sufficient frame rates necessary for reliable communication of embodied social signals. We propose a hybrid evaluation approach which coherently relates results from technical benchmarks to subjective ratings and which confirms required performance characteristics for the target scenario of larger distributed groups. A user-study reveals positive effects of an increasing number of co-located social companions on the quality of experience of virtual worlds, i.e., on presence, possibility of interaction, and co-presence. It also shows that variety in avatar/agent appearance might increase eeriness but might also stimulate an increased interest of participants about the environment.
  @article{latoschik2019alone, abstract = {This article investigates performance and user experience in Social Virtual Reality (SVR) targeting distributed, embodied, and immersive, face-to-face encounters. We demonstrate the close relationship between scalability, reproduction accuracy, and the resulting performance characteristics, as well as the impact of these characteristics on users co-located with larger groups of embodied virtual others. System scalability provides a variable number of co-located avatars and AI-controlled agents with a variety of different appearances, including realistic-looking virtual humans generated from photogrammetry scans. The article reports on how to meet the requirements of embodied SVR with today\u0027s technical off-the-shelf solutions and what to expect regarding features, performance, and potential limitations. Special care has been taken to achieve low latencies and sufficient frame rates necessary for reliable communication of embodied social signals. We propose a hybrid evaluation approach which coherently relates results from technical benchmarks to subjective ratings and which confirms required performance characteristics for the target scenario of larger distributed groups. A user-study reveals positive effects of an increasing number of co-located social companions on the quality of experience of virtual worlds, i.e., on presence, possibility of interaction, and co-presence. It also shows that variety in avatar/agent appearance might increase eeriness but might also stimulate an increased interest of participants about the environment.}, author = {Latoschik, Marc Erich and Kern, Florian and Stauffert, Jan-Philipp and Bartl, Andrea and Botsch, Mario and Lugrin, Jean-Luc}, journal = {IEEE Transactions on Visualization and Computer Graphics (TVCG)}, keywords = {ieee2019 latoschik myown}, month = {may}, number = 5, pages = {2134-2144}, title = {Not Alone Here?! Scalability and User Experience of Embodied Ambient Crowds in Distributed Social Virtual Reality}, volume = 25, year = 2019 }
• Korger, A., Baumeister, J.: Textual Case-based Adaptation using Semantic Relatedness - A Case Study in the Domain of Security Documents. WM2019 - 10te Konferenz Professionelles Wissensmanagement (2019).
  [ BibTeX ]
   
  @inproceedings{korger2019textual, author = {Korger, Andreas and Baumeister, Joachim}, booktitle = {WM2019 - 10te Konferenz Professionelles Wissensmanagement}, keywords = {myown rokt}, title = {Textual Case-based Adaptation using Semantic Relatedness - A Case Study in the Domain of Security Documents}, year = 2019 }
• Mertinat, N.: Impact of Content Selection on Crowdsourced QoE Studies of HTTP Adaptive Streaming on Mobile Devices, (2019).
  [ Abstract ] [ BibTeX ]
   
  Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Impact of Content Selection on Crowdsourced QoE Studies of HTTP Adaptive Streaming on Mobile Devices Abstract: The goal of this work is to conduct a crowdsourcing study on the Quality of Experience (QoE) of HTTP adaptive video streaming. In the study, users shall stream videos with the app CroQoE, which already exists as a prototype, and assess the QoE. It shall be investigated if there is an impact on the ratings if users can select the videos, which they stream during the study. Titel: Einfluss von Videoauswahl auf Crowdsourcing-basierte Studien zur subjektiven Dienstgüte von adaptivem HTTP Videostreaming auf mobilen Endgeräten Inhalt: Das Ziel dieser Arbeit ist es eine Crowdsourcing-basierte Studie zur subjektiven Dienstgüte bei Videostreaming durchzuführen. In der Studie sollen die Nutzer mittels einer bereits als Prototyp existierenden App CroQoE Videos streamen und die subjektive Dienstgüte bewerten. Dabei soll herausgefunden werden, ob es einen Einfluss auf die Bewertungen hat, wenn die Nutzer die Videos, die sie während der Studie streamen, selbst wählen können.
  @mastersthesis{info3-bachelor-2019-5, abstract = {Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Impact of Content Selection on Crowdsourced QoE Studies of HTTP Adaptive Streaming on Mobile Devices Abstract: The goal of this work is to conduct a crowdsourcing study on the Quality of Experience (QoE) of HTTP adaptive video streaming. In the study, users shall stream videos with the app CroQoE, which already exists as a prototype, and assess the QoE. It shall be investigated if there is an impact on the ratings if users can select the videos, which they stream during the study. Titel: Einfluss von Videoauswahl auf Crowdsourcing-basierte Studien zur subjektiven Dienstgüte von adaptivem HTTP Videostreaming auf mobilen Endgeräten Inhalt: Das Ziel dieser Arbeit ist es eine Crowdsourcing-basierte Studie zur subjektiven Dienstgüte bei Videostreaming durchzuführen. In der Studie sollen die Nutzer mittels einer bereits als Prototyp existierenden App CroQoE Videos streamen und die subjektive Dienstgüte bewerten. Dabei soll herausgefunden werden, ob es einen Einfluss auf die Bewertungen hat, wenn die Nutzer die Videos, die sie während der Studie streamen, selbst wählen können.}, author = {Mertinat, Nils}, keywords = {myown}, school = {University of Würzburg}, title = {Impact of Content Selection on Crowdsourced QoE Studies of HTTP Adaptive Streaming on Mobile Devices}, year = 2019 }
• Supervisor: Seufert, M.: Evaluation of the Impact of Cross-Traffic on TCP and QUIC Video Streaming, (2019).
  [ Abstract ] [ BibTeX ]
   
  Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Evaluation of the Impact of Cross-Traffic on TCP and QUIC Video Streaming Abstract: The goal of this work is to prepare, conduct, and evaluate a measurements study, which investigates the impact of cross-traffic on TCP and QUIC video streaming. For that, an existing measurement framework can be reused. Moreover, impact factors with respect to the configuration of the transport protocols shall be identified and investigated in detail during this work. Titel: Auswertung des Einflusses von Störverkehr auf TCP- und QUIC-basiertes Videostreaming Inhalt: Das Ziel dieser Arbeit ist es eine Messstudie vorzubereiten, durchzuführen und auszuwerten bei der der Einfluss von Störverkehr auf TCP- und QUIC-basiertes Videostreaming untersucht wird. Dazu kann auf ein existierendes Messframework aufgesetzt werden. Im Verlauf der Arbeit sollen außerdem Einflussfaktoren bei der Konfiguration der Transportprotokolle identifiziert werden und genauer untersucht werden.
  @mastersthesis{info3-bachelor-2019-6, abstract = {Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Evaluation of the Impact of Cross-Traffic on TCP and QUIC Video Streaming Abstract: The goal of this work is to prepare, conduct, and evaluate a measurements study, which investigates the impact of cross-traffic on TCP and QUIC video streaming. For that, an existing measurement framework can be reused. Moreover, impact factors with respect to the configuration of the transport protocols shall be identified and investigated in detail during this work. Titel: Auswertung des Einflusses von Störverkehr auf TCP- und QUIC-basiertes Videostreaming Inhalt: Das Ziel dieser Arbeit ist es eine Messstudie vorzubereiten, durchzuführen und auszuwerten bei der der Einfluss von Störverkehr auf TCP- und QUIC-basiertes Videostreaming untersucht wird. Dazu kann auf ein existierendes Messframework aufgesetzt werden. Im Verlauf der Arbeit sollen außerdem Einflussfaktoren bei der Konfiguration der Transportprotokolle identifiziert werden und genauer untersucht werden.}, author = {Supervisor: Seufert, Michael}, keywords = {myown}, school = {University of Würzburg}, title = {Evaluation of the Impact of Cross-Traffic on TCP and QUIC Video Streaming}, year = 2019 }
• Heidrich, D., Oberdörfer, S., Latoschik, M.E.: The Effects of Immersion on Harm-Inducing Factors in Virtual Slot Machines. Proceedings of the 26th IEEE Virtual Reality (VR) conference. IEEE (2019).
  [ BibTeX ] [ URL ]
   
  @inproceedings{heidrichtobepublishedeffects, author = {Heidrich, David and Oberdörfer, Sebastian and Latoschik, Marc Erich}, booktitle = {Proceedings of the 26th IEEE Virtual Reality (VR) conference}, keywords = {ieee2019 myown oberdoerfer}, publisher = {IEEE}, title = {The Effects of Immersion on Harm-Inducing Factors in Virtual Slot Machines}, year = 2019 }
• Schwind, A., Haberzettl, L., Wamser, F., Hoßfeld, T.: QoE Analysis of Spotify Audio Streaming and App Browsing. 4th Internet-QoE Workshop: QoE-based Analysis and Management of Data Communication Networks (Internet-QoE'19) (2019).
  [ Abstract ] [ BibTeX ]
   
  Spotify is the most-listened audio streaming provider in 2019 with 217 million active users per month. Providers are therefore interested in the quality and functionality of Spotify in order to provide their users with the best possible streaming quality. While video streaming services such as Netflix and their streaming approach have been extensively explored in previous research, audio streaming services like Spotify and their corresponding behavior at certain network conditions have not been considered in detail yet. In this paper, we perform a QoE analysis under various network conditions and examine the app browsing performance of the audio streaming platform Spotify using its native Android mobile application. We have developed a measurement tool that emulates a user listening to audio through Spotify. While streaming, application and network layer parameters are captured that have a high correlation to the user’s QoE. The paper shows a baseline scenario including the streaming of a single song as well as playlist streaming behavior. Next, the effect of interruptions on the streaming behavior is evaluated and finally, the influence of network impairments on QoE key performance indicators such as initial delay is shown.
  @inproceedings{info3-inproceedings-2019-27, abstract = {Spotify is the most-listened audio streaming provider in 2019 with 217 million active users per month. Providers are therefore interested in the quality and functionality of Spotify in order to provide their users with the best possible streaming quality. While video streaming services such as Netflix and their streaming approach have been extensively explored in previous research, audio streaming services like Spotify and their corresponding behavior at certain network conditions have not been considered in detail yet. In this paper, we perform a QoE analysis under various network conditions and examine the app browsing performance of the audio streaming platform Spotify using its native Android mobile application. We have developed a measurement tool that emulates a user listening to audio through Spotify. While streaming, application and network layer parameters are captured that have a high correlation to the user’s QoE. The paper shows a baseline scenario including the streaming of a single song as well as playlist streaming behavior. Next, the effect of interruptions on the streaming behavior is evaluated and finally, the influence of network impairments on QoE key performance indicators such as initial delay is shown.}, author = {Schwind, Anika and Haberzettl, Lorenz and Wamser, Florian and Hoßfeld, Tobias}, booktitle = {4th Internet-QoE Workshop: QoE-based Analysis and Management of Data Communication Networks (Internet-QoE'19)}, keywords = {myown}, month = 10, title = {QoE Analysis of Spotify Audio Streaming and App Browsing}, year = 2019 }
• Lugrin, J.-L., Unruh, F., Landeck, M., Lamour, Y., Latoschik, M.E., Vogeley, K., Wittmann, M.: Experiencing Waiting Time in Virtual Reality. Proceedings of the 25th ACM Conference on Virtual Reality Software and Technology (2019).
  [ BibTeX ] [ URL ]
   
  @inproceedings{lugrin2019experiencing, author = {Lugrin, Jean-Luc and Unruh, Fabian and Landeck, Maximilian and Lamour, Yoan and Latoschik, Marc Erich and Vogeley, Kai and Wittmann, Marc}, booktitle = {Proceedings of the 25th ACM Conference on Virtual Reality Software and Technology}, keywords = {myown}, title = {Experiencing Waiting Time in Virtual Reality}, year = 2019 }
• Okamoto, Y., Ravsky, A., Wolff, A.: Variants of the Segment Number of a Graph. In: Archambault, D. und Tóth, C.D. (hrsg.) Proc. 27th Int. Symp. Graph Drawing & Network Vis. (GD'19). Springer-Verlag (2019).
  [ BibTeX ]
   
  @inproceedings{orw-ysng-GD19, author = {Okamoto, Yoshio and Ravsky, Alexander and Wolff, Alexander}, booktitle = {Proc. 27th Int. Symp. Graph Drawing \& Network Vis. (GD'19)}, editor = {Archambault, Daniel and T{ó}th, Csaba D.}, keywords = {csuniwue myown}, note = {To appear.}, publisher = {Springer-Verlag}, series = {Lecture Notes in Computer Science}, title = {Variants of the Segment Number of a Graph}, year = 2019 }
• Firman, O., Kindermann, P., Ravsky, A., Wolff, A., Zink, J.: Computing Optimal-Height Tangles Faster. In: Archambault, D. und Tóth, C.D. (hrsg.) Proc. 27th Int. Symp. Graph Drawing & Network Vis. (GD'19). Springer-Verlag (2019).
  [ BibTeX ]
   
  @inproceedings{fkrwz-cohtf-GD19, author = {Firman, Oksana and Kindermann, Philipp and Ravsky, Alexander and Wolff, Alexander and Zink, Johannes}, booktitle = {Proc. 27th Int. Symp. Graph Drawing \& Network Vis. (GD'19)}, editor = {Archambault, Daniel and T{ó}th, Csaba D.}, keywords = {csuniwue gd-info1 myown}, note = {To appear.}, publisher = {Springer-Verlag}, series = {Lecture Notes in Computer Science}, title = {Computing Optimal-Height Tangles Faster}, year = 2019 }
• Supervisor: Schwind, A.: Evaluating the QoE of Music Streaming Applications, (2019).
  [ Abstract ] [ BibTeX ]
   
  Contact: anika.schwind@informatik.uni-wuerzburg.de
  @mastersthesis{info3-bachelor-2019-18, abstract = {Contact: anika.schwind@informatik.uni-wuerzburg.de}, author = {Supervisor: Schwind, Anika}, keywords = {myown}, school = {University of Würzburg}, title = {Evaluating the QoE of Music Streaming Applications}, year = 2019 }
• Wassermann, S., Wehner, N., Casas, P.: Machine Learning Models for YouTube QoE and User Engagement Prediction in Smartphones. ACM SIGMETRICS Performance Evaluation Review. 46, 155-158 (2019).
  [ Abstract ] [ BibTeX ]
   
  Measuring and monitoring YouTube Quality of Experience is a challenging task, especially when dealing with cellular networks and smartphone users. Using a large-scale database of crowdsourced YouTube-QoE measurements in smartphones, we conceive multiple machine-learning models to infer different YouTube-QoE-relevant metrics and userbehavior- related metrics from network-level measurements, without requiring root access to the smartphone, video-player embedding, or any other reverse-engineering-like approaches. The dataset includes measurements from more than 360 users worldwide, spanning over the last five years. Our preliminary results suggest that QoE-based monitoring of YouTube mobile can be realized through machine learning models with high accuracy, relying only on network-related features and without accessing any higher-layer metric to perform the estimations.
  @article{info3-article-2019-10, abstract = {Measuring and monitoring YouTube Quality of Experience is a challenging task, especially when dealing with cellular networks and smartphone users. Using a large-scale database of crowdsourced YouTube-QoE measurements in smartphones, we conceive multiple machine-learning models to infer different YouTube-QoE-relevant metrics and userbehavior- related metrics from network-level measurements, without requiring root access to the smartphone, video-player embedding, or any other reverse-engineering-like approaches. The dataset includes measurements from more than 360 users worldwide, spanning over the last five years. Our preliminary results suggest that QoE-based monitoring of YouTube mobile can be realized through machine learning models with high accuracy, relying only on network-related features and without accessing any higher-layer metric to perform the estimations.}, author = {Wassermann, Sarah and Wehner, Nikolas and Casas, Pedro}, journal = {ACM SIGMETRICS Performance Evaluation Review}, keywords = {myown}, month = 1, number = 3, pages = {155-158}, title = {Machine Learning Models for YouTube QoE and User Engagement Prediction in Smartphones}, volume = 46, year = 2019 }
• Gray, N.: Evaluation of the Impact of Network Topologies and Applications on Synchronization Strategies of Distributed SDN Controllers, (2019).
  [ 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 = 2019 }
• Gray, N.: Evaluation of Offloading Firewall Rules with P4, (2019).
  [ 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 = 2019 }
• Biedl, T., Felsner, S., Meijer, H., Wolff, A.: Line and Plane Cover Numbers Revisited. In: Archambault, D. und Tóth, C.D. (hrsg.) Proc. 27th Int. Symp. Graph Drawing & Network Vis. (GD'19). Springer-Verlag (2019).
  [ BibTeX ]
   
  @inproceedings{bfmw-lpcnr-GD19, author = {Biedl, Therese and Felsner, Stefan and Meijer, Henk and Wolff, Alexander}, booktitle = {Proc. 27th Int. Symp. Graph Drawing \& Network Vis. (GD'19)}, editor = {Archambault, Daniel and T{ó}th, Csaba D.}, keywords = {csuniwue myown}, note = {To appear.}, publisher = {Springer-Verlag}, series = {Lecture Notes in Computer Science}, title = {Line and Plane Cover Numbers Revisited}, year = 2019 }
• Supervisor: Schwind, A.: Investigating the QoE of Mobile Messaging, (2019).
  [ Abstract ] [ BibTeX ]
   
  Contact: anika.schwind@informatik.uni-wuerzburg.de
  @mastersthesis{info3-praktikum-2019-15, abstract = {Contact: anika.schwind@informatik.uni-wuerzburg.de}, author = {Supervisor: Schwind, Anika}, keywords = {myown}, school = {University of Würzburg}, title = {Investigating the QoE of Mobile Messaging}, year = 2019 }
• Lugrin, J.-L., Juchno, A., Schaper, P., Landeck, M., Latoschik, M.E.: Drone-Steering: A Novel VR Traveling Technique. In: of the 25th ACM Conference on Virtual Reality Software, P. und Technology, (hrsg.) Proceedings of the 25th ACM Conference on Virtual Reality Software and Technology (2019).
  [ BibTeX ] [ URL ]
   
  @inproceedings{lugrin2019dronesteering, author = {Lugrin, Jean-Luc and Juchno, Andreas and Schaper, Philipp and Landeck, Maximilian and Latoschik, Marc Erich}, booktitle = {Proceedings of the 25th ACM Conference on Virtual Reality Software and Technology}, editor = {of the 25th ACM Conference on Virtual Reality Software, Proceedings and Technology}, keywords = {myown}, title = {Drone-Steering: A Novel VR Traveling Technique}, volume = {VRST'19}, year = 2019 }
• Niebling, F., Haas, M., Blessing, A.´: Integration of Services for Software Development in DH: A Case Study of Image Classification using Convolutional Neural Networks. In: Draude, C., Lange, M., und Sick, B. (hrsg.) INFORMATIK 2019: 50 Jahre Gesellschaft für Informatik – Informatik für Gesellschaft (Workshop-Beiträge). S. 163-168. Gesellschaft für Informatik e.V., Bonn (2019).
  [ BibTeX ] [ DOI ]
   
  @inproceedings{mci/Niebling2019, address = {Bonn}, author = {Niebling, Florian and Haas, Michael and Blessing, Andre´}, booktitle = {INFORMATIK 2019: 50 Jahre Gesellschaft für Informatik – Informatik für Gesellschaft (Workshop-Beiträge)}, editor = {Draude, Claude and Lange, Martin and Sick, Bernhard}, keywords = {myown niebling}, pages = {163-168}, publisher = {Gesellschaft für Informatik e.V.}, series = {Lecture Notes in Informatics (LNI) - Proceedings}, title = {Integration of Services for Software Development in DH: A Case Study of Image Classification using Convolutional Neural Networks}, volume = {P-295}, year = 2019 }
• Supervisor: Wehner, N.: Comparison of Web QoE Algorithms on Different Devices, (2019).
  [ 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 = {Supervisor: Wehner, Nikolas}, keywords = {myown}, school = {University of Würzburg}, title = {Comparison of Web QoE Algorithms on Different Devices}, year = 2019 }
• Supervisor: Borchert, K.: Analysis and Correlation of objective and subjective Performance Data of an Enterprise Application, (2019).
  [ Abstract ] [ BibTeX ]
   
  Contact: kathrin.borchert@informatik.uni-wuerzburg.de
  @mastersthesis{info3-praktikum-2017-9, abstract = {Contact: kathrin.borchert@informatik.uni-wuerzburg.de}, author = {Supervisor: Borchert, Kathrin}, keywords = {myown kpi-it ua-net}, school = {University of Wuerzburg}, title = {Analysis and Correlation of objective and subjective Performance Data of an Enterprise Application}, year = 2019 }
• Chaplick, S., Lipp, F., Wolff, A., Zink, J.: Compact Drawings of 1-Planar Graphs with Right-Angle Crossings and Few Bends. Computational Geometry: Theory and Applications. 84, 50--68 (2019).
  [ Abstract ] [ BibTeX ] [ DOI ]
   
  We study the following classes of beyond-planar graphs: 1-planar, IC-planar, and NIC-planar graphs. These are the graphs that admit a 1-planar, IC-planar, and NIC-planar drawing, respectively. A drawing of a graph is emph1-planar if every edge is crossed at most once. A 1-planar drawing is emphIC-planar if no two pairs of crossing edges share a vertex. A 1-planar drawing is emphNIC-planar if no two pairs of crossing edges share two vertices. We study the relations of these beyond-planar graph classes (\emphbeyond-planar graphs is a collective term for the primary attempts to generalize the planar graphs) to emphright-angle crossing (\emphRAC) graphs that admit compact drawings on the grid with few bends. We present four drawing algorithms that preserve the given embeddings. First, we show that every \($n$\)-vertex NIC-planar graph admits a NIC-planar RAC drawing with at most one bend per edge on a grid of size \($O(n) times O(n)$\). Then, we show that every \($n$\)-vertex 1-planar graph admits a 1-planar RAC drawing with at most two bends per edge on a grid of size \($O(n^3) times O(n^3)$\). Finally, we make two known algorithms embedding-preserving; for drawing 1-planar RAC graphs with at most one bend per edge and for drawing IC-planar RAC graphs straight-line.
  @article{clwz-cd1pg-CGTA19, abstract = {We study the following classes of beyond-planar graphs: 1-planar, IC-planar, and NIC-planar graphs. These are the graphs that admit a 1-planar, IC-planar, and NIC-planar drawing, respectively. A drawing of a graph is \emph{1-planar} if every edge is crossed at most once. A 1-planar drawing is \emph{IC-planar} if no two pairs of crossing edges share a vertex. A 1-planar drawing is \emph{NIC-planar} if no two pairs of crossing edges share two vertices. We study the relations of these beyond-planar graph classes (\emph{beyond-planar graphs} is a collective term for the primary attempts to generalize the planar graphs) to \emph{right-angle crossing} (\emph{RAC}) graphs that admit compact drawings on the grid with few bends. We present four drawing algorithms that preserve the given embeddings. First, we show that every $n$-vertex NIC-planar graph admits a NIC-planar RAC drawing with at most one bend per edge on a grid of size $O(n) \times O(n)$. Then, we show that every $n$-vertex 1-planar graph admits a 1-planar RAC drawing with at most two bends per edge on a grid of size $O(n^3) \times O(n^3)$. Finally, we make two known algorithms embedding-preserving; for drawing 1-planar RAC graphs with at most one bend per edge and for drawing IC-planar RAC graphs straight-line.}, author = {Chaplick, Steven and Lipp, Fabian and Wolff, Alexander and Zink, Johannes}, journal = {Computational Geometry: Theory and Applications}, keywords = {csuniwue gd-info1 myown}, note = {Special Issue on the 34th European Workshop on Computational Geometry}, pages = {50--68}, title = {Compact Drawings of 1-Planar Graphs with Right-Angle Crossings and Few Bends}, volume = 84, year = 2019 }
• Hettinger, L., Zehe, A., Dallmann, A., Hotho, A.: EClaiRE: Context Matters! – Comparing Word Embeddings for Relation Classification. In: David, K., Geihs, K., Lange, M., und Stumme, G. (hrsg.) INFORMATIK 2019: 50 Jahre Gesellschaft für Informatik – Informatik für Gesellschaft. S. 191-204. Gesellschaft für Informatik e.V., Bonn (2019).
  [ BibTeX ]
   
  @inproceedings{hettinger2019eclaire, address = {Bonn}, author = {Hettinger, Lena and Zehe, Albin and Dallmann, Alexander and Hotho, Andreas}, booktitle = {INFORMATIK 2019: 50 Jahre Gesellschaft für Informatik – Informatik für Gesellschaft}, editor = {David, Klaus and Geihs, Kurt and Lange, Martin and Stumme, Gerd}, keywords = {2019 classification embeddings myown relation semeval10 semeval18 word word_embedding}, pages = {191-204}, publisher = {Gesellschaft für Informatik e.V.}, title = {EClaiRE: Context Matters! – Comparing Word Embeddings for Relation Classification}, year = 2019 }
• Koopmann, T., Dallmann, A., Hettinger, L., Niebler, T., Hotho, A.: On the Right Track! Analysing and Predicting Navigation Success in Wikipedia. In: Atzenbeck, C., Rubart, J., und Millard, D.E. (hrsg.) Proceedings of the 30th ACM Conference on Hypertext and Social Media. S. 143--152. ACM, Hof, Germany (2019).
  [ BibTeX ] [ URL ] [ DOI ]
   
  @inproceedings{Koopmann:2019:RTA:3342220.3343650, address = {New York, NY, USA}, author = {Koopmann, Tobias and Dallmann, Alexander and Hettinger, Lena and Niebler, Thomas and Hotho, Andreas}, booktitle = {Proceedings of the 30th ACM Conference on Hypertext and Social Media}, editor = {Atzenbeck, Claus and Rubart, Jessica and Millard, David E.}, keywords = {2019 behaviour modelling myown navigation path prediction success user web wikipedia}, pages = {143--152}, publisher = {ACM}, series = {HT '19}, title = {On the Right Track! Analysing and Predicting Navigation Success in Wikipedia}, year = 2019 }
• Chaplick, S., Kindermann, P., Löffler, A., Thiele, F., Wolff, A., Zaft, A., Zink, J.: Stick Graphs with Length Constraints. In: Archambault, D. und Tóth, C.D. (hrsg.) Proc. 27th Int. Symp. Graph Drawing & Network Vis. (GD'19). Springer-Verlag (2019).
  [ BibTeX ]
   
  @inproceedings{ckltwzz-sglc-GD19, author = {Chaplick, Steven and Kindermann, Philipp and L{ö}ffler, Andre and Thiele, Florian and Wolff, Alexander and Zaft, Alexander and Zink, Johannes}, booktitle = {Proc. 27th Int. Symp. Graph Drawing \& Network Vis. (GD'19)}, editor = {Archambault, Daniel and T{ó}th, Csaba D.}, keywords = {csuniwue gd-info1 myown}, note = {To appear.}, publisher = {Springer-Verlag}, series = {Lecture Notes in Computer Science}, title = {Stick Graphs with Length Constraints}, year = 2019 }
• Chaplick, S., van Dijk, T.C., Kryven, M., Park, J.-W., Ravsky, A., Wolff, A.: Bundled Crossings Revisited. In: Archambault, D. und Tóth, C.D. (hrsg.) Proc. 27th Int. Symp. Graph Drawing & Network Vis. (GD'19). Springer-Verlag (2019).
  [ BibTeX ]
   
  @inproceedings{cdkprw-bcr-GD19, author = {Chaplick, Steven and van Dijk, Thomas C. and Kryven, Myroslav and Park, Ji-Won and Ravsky, Alexander and Wolff, Alexander}, booktitle = {Proc. 27th Int. Symp. Graph Drawing \& Network Vis. (GD'19)}, editor = {Archambault, Daniel and T{ó}th, Csaba D.}, keywords = {csuniwue myown}, note = {To appear.}, publisher = {Springer-Verlag}, series = {Lecture Notes in Computer Science}, title = {Bundled Crossings Revisited}, year = 2019 }
• Supervisor: Seufert, M.: Estimating QoE of Web Browsing in the Network, (2019).
  [ Abstract ] [ BibTeX ]
   
  Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Estimating QoE of Web Browsing in the Network Abstract: This work is focused on Quality of Experience (QoE) of web browsing, i.e., the subjectively perceived goodness of the web browsing performance. First, known impact factors and metrics of web browsing (such as page load time, above the fold time, SpeedIndex) have to be tested and additional impact factors have to be identified. Afterwards, these impact factors have to be estimated from web browsing traffic, which is typically encrpyted. A measurement framework will be set up and crowdsourcing studies will be conducted to generate ground truth data. Different monitoring methods will be applied (such as model-based or machine-learning-based monitoring) and their performance for estimating the QoE of web browsing will be evaluated. Titel: Abschätzen der subjektiven Dienstgüte von Webbrowsing im Netzwerk Inhalt: Diese Arbeit beschäftigt sich mit der QoE von Webbrowsing, d.h., der subjektiven Güte des Webbrosing-Dienstes. Zuerst müssen bekannte Einflussfaktoren und Metriken (z.B. Seitenladezeit, "Über dem Knick"-Zeit, SpeedIndex) getestet werden und zusätzliche Einflussfaktoren identifiziert werden. Danach müssen diese Einflussfaktoren aus dem (typischerweise verschlüsselten) Webbrowsing-Netzwerkverkehr abgeschätzt werden. Ein Messframework wird aufgesetzt und Crowdsourcing-Studien werden durchgeführt um eine Datengrundlage zu erstellen. Verschiedene Monitoringansätze werden angewendet (z.B. modell- oder Machine-Learning-basiertes Monitoring) und ihre Leistungsfähigkeit beim Abschätzen der subjektiven Dienstgüte von Webbrowsing wird ausgewertet.
  @mastersthesis{info3-master-2019-2, abstract = {Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Estimating QoE of Web Browsing in the Network Abstract: This work is focused on Quality of Experience (QoE) of web browsing, i.e., the subjectively perceived goodness of the web browsing performance. First, known impact factors and metrics of web browsing (such as page load time, above the fold time, SpeedIndex) have to be tested and additional impact factors have to be identified. Afterwards, these impact factors have to be estimated from web browsing traffic, which is typically encrpyted. A measurement framework will be set up and crowdsourcing studies will be conducted to generate ground truth data. Different monitoring methods will be applied (such as model-based or machine-learning-based monitoring) and their performance for estimating the QoE of web browsing will be evaluated. Titel: Abschätzen der subjektiven Dienstgüte von Webbrowsing im Netzwerk Inhalt: Diese Arbeit beschäftigt sich mit der QoE von Webbrowsing, d.h., der subjektiven Güte des Webbrosing-Dienstes. Zuerst müssen bekannte Einflussfaktoren und Metriken (z.B. Seitenladezeit, "Über dem Knick"-Zeit, SpeedIndex) getestet werden und zusätzliche Einflussfaktoren identifiziert werden. Danach müssen diese Einflussfaktoren aus dem (typischerweise verschlüsselten) Webbrowsing-Netzwerkverkehr abgeschätzt werden. Ein Messframework wird aufgesetzt und Crowdsourcing-Studien werden durchgeführt um eine Datengrundlage zu erstellen. Verschiedene Monitoringansätze werden angewendet (z.B. modell- oder Machine-Learning-basiertes Monitoring) und ihre Leistungsfähigkeit beim Abschätzen der subjektiven Dienstgüte von Webbrowsing wird ausgewertet.}, author = {Supervisor: Seufert, Michael}, keywords = {myown}, school = {University of Würzburg}, title = {Estimating QoE of Web Browsing in the Network}, year = 2019 }
• Dewitz, L., Münster, S., Niebling, F.: Usability-Testing für Softwarewerkzeuge in den Digital Humanities am Beispiel von Bildrepositorien. DHd 2019 Digital Humanities: multimedial & multimodal. Konferenzabstracts, Frankfurt am Main. 52-55 (2019).
  [ BibTeX ] [ DOI ]
   
  @article{dewitz2019usabilitytesting, author = {Dewitz, Leyla and Münster, Sander and Niebling, Florian}, editor = {Sahle, Patrick}, journal = {DHd 2019 Digital Humanities: multimedial & multimodal. Konferenzabstracts, Frankfurt am Main}, keywords = {histstadt4d myown niebling}, pages = {52-55}, title = {Usability-Testing für Softwarewerkzeuge in den Digital Humanities am Beispiel von Bildrepositorien}, year = 2019 }
• Supervisor: Seufert, M.: Identifying User Behavior from Encrypted Video Streaming Traffic, (2019).
  [ 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 = 2019 }
• Supervisor: Seufert, M.: Characterization of Browsing Sessions, (2019).
  [ Abstract ] [ BibTeX ]
   
  Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Characterization of Browsing Sessions Abstract: The goal of this work is to characterize browsing sessions, which consist of visits to multiple web pages. In particular, the navigation timing between page visists shall be modelled. Titel: Charakterisierung von Browsingsessions Inhalt: Das Ziel dieser Arbeit ist die Charakterisierung von Browsingsessions, die üblicherweise aus Besuchen von mehreren Seiten bestehen. Insbesondere sollen dabei zeitliche Aspekte der Navigation modelliert werden.
  @mastersthesis{info3-praktikum-2019-4, abstract = {Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Characterization of Browsing Sessions Abstract: The goal of this work is to characterize browsing sessions, which consist of visits to multiple web pages. In particular, the navigation timing between page visists shall be modelled. Titel: Charakterisierung von Browsingsessions Inhalt: Das Ziel dieser Arbeit ist die Charakterisierung von Browsingsessions, die üblicherweise aus Besuchen von mehreren Seiten bestehen. Insbesondere sollen dabei zeitliche Aspekte der Navigation modelliert werden.}, author = {Supervisor: Seufert, Michael}, keywords = {myown}, school = {University of Würzburg}, title = {Characterization of Browsing Sessions}, year = 2019 }
• Supervisor: Seufert, M.: Algorithms Towards Proactive QoE-aware Traffic Management, (2019).
  [ Abstract ] [ BibTeX ]
   
  Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Algorithms Towards Proactive QoE-aware Traffic Management Abstract: QoE-aware traffic management aims at improving the packet transmission and handling in the network in order to maximize the Quality of Experience (QoE) of Internet services. While most of today's approaches follow a reactive design, i.e., they change the traffic management only after a QoE degradation are detected or imminent, the focus of this work is to advance towards a more proactive design. This means algorithms shall be developed to improve the traffic management, such that it can be adjusted to changing network and service characteristics before QoE degradations can be noticed by the end users. In the thesis, also the performance of the algorithms shall be evaluated. Titel: Algorithmen für proaktives QoE-bewusstes Verkehrsmanagement Inhalt: QoE-bewusstes Verkehrsmanagement zielt darauf die Übertragung und den Umgang mit Paketen im Netzwerk zu verbessern, um damit die subjektive Dienstgüte (QoE) von Internetdiensten zu verbessern. Während die meisten der heutigen Ansätze eher ein reaktives Design haben, d.h., sie ändern das Verkehrsmanagement erst wenn eine Verschlechterung der QoE wahrgenommen wurde oder unmittelbar bevorsteht, liegt der Fokus dieser Arbeit darauf eine proaktiveres Design voranzubringen. Das bedeutet, dass Algorithmen entworfen werden sollen, um das Verkehrsmanagement zu verbessern, so dass es auf sich ändernde Netzwerk- und Dienstcharakteristika adaptiert werden kann bevor Verschlechterungen der QoE vom Endnutzer wahrgenommen werden können. In der Arbeit soll auch die Leistung der Algorithmen bewertet werden.
  @mastersthesis{info3-master-2019-3, abstract = {Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Algorithms Towards Proactive QoE-aware Traffic Management Abstract: QoE-aware traffic management aims at improving the packet transmission and handling in the network in order to maximize the Quality of Experience (QoE) of Internet services. While most of today's approaches follow a reactive design, i.e., they change the traffic management only after a QoE degradation are detected or imminent, the focus of this work is to advance towards a more proactive design. This means algorithms shall be developed to improve the traffic management, such that it can be adjusted to changing network and service characteristics before QoE degradations can be noticed by the end users. In the thesis, also the performance of the algorithms shall be evaluated. Titel: Algorithmen für proaktives QoE-bewusstes Verkehrsmanagement Inhalt: QoE-bewusstes Verkehrsmanagement zielt darauf die Übertragung und den Umgang mit Paketen im Netzwerk zu verbessern, um damit die subjektive Dienstgüte (QoE) von Internetdiensten zu verbessern. Während die meisten der heutigen Ansätze eher ein reaktives Design haben, d.h., sie ändern das Verkehrsmanagement erst wenn eine Verschlechterung der QoE wahrgenommen wurde oder unmittelbar bevorsteht, liegt der Fokus dieser Arbeit darauf eine proaktiveres Design voranzubringen. Das bedeutet, dass Algorithmen entworfen werden sollen, um das Verkehrsmanagement zu verbessern, so dass es auf sich ändernde Netzwerk- und Dienstcharakteristika adaptiert werden kann bevor Verschlechterungen der QoE vom Endnutzer wahrgenommen werden können. In der Arbeit soll auch die Leistung der Algorithmen bewertet werden.}, author = {Supervisor: Seufert, Michael}, keywords = {myown}, school = {University of Würzburg}, title = {Algorithms Towards Proactive QoE-aware Traffic Management}, year = 2019 }
• Seufert, M.: Quality of Experience and Access Network Traffic Management of HTTP Adaptive Video Streaming. , International Conference on Networked Systems (NetSys), KuVS Dissertation Award 2018, Munich, Germany (2019).
  [ BibTeX ]
   
  @presentation{info3-presentation-2019-2, address = {International Conference on Networked Systems (NetSys), KuVS Dissertation Award 2018, Munich, Germany}, author = {Seufert, Michael}, keywords = {myown}, month = 3, title = {Quality of Experience and Access Network Traffic Management of HTTP Adaptive Video Streaming}, year = 2019 }
• Moldovan, C., Wamser, F., Hoßfeld, T.: Energy-Efficient Adaptation Logic for HTTP Streaming in Mobile Networks. 2019 International Conference on Networked Systems (NetSys) (2019).
  [ Abstract ] [ BibTeX ]
   
  The requirements for video streaming have changed drastically during the past years. In today's Internet, high definition resolutions are considered default for videos, even in mobile settings, and with 4G penetration reaching 90 percent in the US, this no longer poses a big problem. However, while mobile bandwidth has increased, the battery life time of mobile devices has not increased significantly. Furthermore, current data plans are still not large enough to regularly stream movies during the commute. Users still resort to downloading media before travel. In this paper we propose a new HTTP adaptive streaming algorithm that delivers videos in high quality while avoiding stalling events, schedules the download of video segments so that a energy conserving idle state is often reached and keeps the buffer low at points in the video where many viewers abandon the video to save data. While most adaptive streaming algorithms optimize quality and stalling, this is the first attempt to use an adaptive streaming algorithm to reduce energy consumption. Since video streaming providers mostly care about the Quality of Experience when watching videos, energy efficiency is left to the device manufacturers. Therefore, both parties have little incentive to cooperate in this regard. But on the Internet of tomorrow, where most videos are watched on mobile devices, energy efficiency and the Quality of Experience must go hand in hand.
  @inproceedings{info3-inproceedings-2019-9, abstract = {The requirements for video streaming have changed drastically during the past years. In today's Internet, high definition resolutions are considered default for videos, even in mobile settings, and with 4G penetration reaching 90 percent in the US, this no longer poses a big problem. However, while mobile bandwidth has increased, the battery life time of mobile devices has not increased significantly. Furthermore, current data plans are still not large enough to regularly stream movies during the commute. Users still resort to downloading media before travel. In this paper we propose a new HTTP adaptive streaming algorithm that delivers videos in high quality while avoiding stalling events, schedules the download of video segments so that a energy conserving idle state is often reached and keeps the buffer low at points in the video where many viewers abandon the video to save data. While most adaptive streaming algorithms optimize quality and stalling, this is the first attempt to use an adaptive streaming algorithm to reduce energy consumption. Since video streaming providers mostly care about the Quality of Experience when watching videos, energy efficiency is left to the device manufacturers. Therefore, both parties have little incentive to cooperate in this regard. But on the Internet of tomorrow, where most videos are watched on mobile devices, energy efficiency and the Quality of Experience must go hand in hand.}, author = {Moldovan, Christian and Wamser, Florian and Hoßfeld, Tobias}, booktitle = {2019 International Conference on Networked Systems (NetSys)}, keywords = {myown dfg-sdn energy-efficiency streaming can net-man}, month = 3, title = {Energy-Efficient Adaptation Logic for HTTP Streaming in Mobile Networks}, year = 2019 }
• Münster, S., Messemer, H., Große, P., Kuroczyński, P., Niebling, F.: Das Wissen in der 3D-Rekonstruktion. In: Sahle, P. (hrsg.) DHd 2019 Digital Humanities: multimedial & multimodal. Konferenzabstracts, Frankfurt am Main. S. 63-65 (2019).
  [ BibTeX ] [ DOI ]
   
  @inbook{RN15, author = {Münster, Sander and Messemer, Heike and Große, Peggy and Kuroczyński, Piotr and Niebling, Florian}, booktitle = {DHd 2019 Digital Humanities: multimedial & multimodal. Konferenzabstracts, Frankfurt am Main}, editor = {Sahle, Patrick}, keywords = {histstadt4d myown niebling}, pages = {63-65}, title = {Das Wissen in der 3D-Rekonstruktion}, type = {Book Section}, year = 2019 }
• Haberzettl, L.: QoS Assessments of Spotify’s Mobile Application for Audio Streaming, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-bachelor-2019-7, author = {Haberzettl, Lorenz}, keywords = {myown}, school = {University of Wuerzburg}, title = {QoS Assessments of Spotify’s Mobile Application for Audio Streaming}, year = 2019 }
• Smietanka, O.: Comparison of LPWAN IoT Device Communication Techniques LoRa and NB-IoT, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-praktikum-2019-5, author = {Smietanka, Oskar}, keywords = {myown}, month = 3, school = {Universität Würzburg}, title = {Comparison of LPWAN IoT Device Communication Techniques LoRa and NB-IoT}, year = 2019 }
• Kurak, T.: Subjektive Nutzerstudie zur Untersuchung des Einflusses von persönlicher Bekanntheit und Popularität eines Videos auf die QoE, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-praktikum-2017-11, author = {Kurak, Tarlan}, keywords = {myown}, school = {University of Wuerzburg}, title = {Subjektive Nutzerstudie zur Untersuchung des Einflusses von persönlicher Bekanntheit und Popularität eines Videos auf die QoE}, year = 2019 }
• Borchert, K., Schwind, A., Hirth, M., Hoßfeld, T.: In Vivo or in Vitro? Influence of the Study Design on Crowdsourced Video QoE. 11th International Conference on Quality of Multimedia Experience (QoMEX) (2019).
  [ BibTeX ]
   
  @inproceedings{info3-inproceedings-2019-10, author = {Borchert, Kathrin and Schwind, Anika and Hirth, Matthias and Hoßfeld, Tobias}, booktitle = {11th International Conference on Quality of Multimedia Experience (QoMEX)}, keywords = {myown ua-net}, month = 6, title = {In Vivo or in Vitro? Influence of the Study Design on Crowdsourced Video QoE}, year = 2019 }
• Prantl, T.: Machine Learning for Synthetically Generated, Adaptive Streaming Data, (2019).
  [ Abstract ] [ BibTeX ]
   
  Ziel dieser Arbeit war es, die Einsatzmöglichkeiten maschinellen Lernens im Bereich des adaptiven Videostreamings zu analysieren und entsprechende Grundlagen zu schaffen. Insbesondere zielt die Arbeit darauf ab, im großen Stil Streaming-Daten synthetisch zu generieren, die als Eingabe für maschinelles Lernen verwendet werden können. Zu diesem Zweck beginnt die Ausarbeitung damit, Grundlagen und Verfah- ren zu erklären, sowie eine Auswahl aus verwandten Arbeiten zu treffen, um daraus wertvolle Ideen abzuleiten. Einer der wichtigsten Begriffe in diesem Zusammenhang war die Definition und Abstraktion des adaptiven Video-Streamings. Hierbei wurden verschiedene Streaming-Adapationsalgorithmen modelliert und neu implementiert, die die Bitrate für die Filmsegemente, die sogenannten Chunks, bestimmen. Ähnlich wichtig war der Begriff der Quality of Experience, die im weiteren Verlauf der Ar- beit als Bewertungsmethode für das Streaming-Erlebnis beim Benutzer diente. Es wurde zu Beginn ein Überblick über die verschiedenen bekannten Verfahren aus der Literatur gegeben. Anschließend wurden die technischen Details, die möglichen Eingabeparameter und die Auswirkungen der verschiedenen Bewertungsverfahren diskutiert. Die Arbeit nutzt lediglich vorhandene QoE-Modelle aus der Literatur. Die Erstellung und Validierung von neuen QoE-Modellen ist nicht Gegenstand der aktuellen Arbeit. Im Hinblick auf verwandte Arbeiten wurden Arbeiten von Orsolic et al. und Mao et al. herangezogen. Als Ergebnis daraus wurden, mit Blick auf das geplante Vor- haben, folgende Ziele aufgstellt: einen umfangreichen Datensatz mit dem Verhalten verschiedener Adaptionsalgorithmen in stark flukturierenden Netzwerken zu generie- ren, geeignete Kombinationen von Algorithmen zu testen und einen globalen Ansatz zur Optimierung von Video-Streaming-Vorgängen mit Hilfe von Ensemble-Learning zu finden. Das erste Ziel war folglich, einen entsprechend großen inhomogenen Streaming- Datensatz für zukünftige Forschungsarbeiten bereitzustellen. Ein möglicher Ansatz bestand darin, dies mit Hilfe von synthetisch generierten Daten zu realisieren. Dazu wurde die synthetische Erzeugung von Streaming-Daten untersucht, um eine Metho- de zur schnellen Herstellung von Streaming-Daten zu erhalten. Zu diesem Zweck wur- de eine Simulation entwickelt, die das Verhalten der Adaptionsalgorithmen BBA0, FESTIVE und PANDA für ein bestimmtes Video in einem bestimmten Netzwerk, mittels eines generalisierten Modelles, berechnet. Um die Genauigkeit dieser Simu- lation zu überprüfen, wurden für jeden Algorithmus drei Streaming-Prozesse real durchgeführt und in der Simulation nachgestellt. Der Vergleich des simulierten und realen Streaming-Prozesses zeigte eine gute Übereinstimmung zwischen Simulati- on und Realität und außerdem, dass ein Adaptionsverfahren umso besser simuliert werden kann, je mehr es die zeitliche Entwicklung der Parameter berücksichtigt. Mit dem Begriff Quality of Experience (QoE) wurde eine Möglichkeit zur Bewertung der simulierten Streamingvorgänge genutzt und anschließend wurden gängige QoE-Verfahren vorgestellt, aus denen eine begründete Auswahl getroffen wurde. Um mit der Simulation möglichst viele Streaming-Daten zu erzeugen, wurde eine Toolchain für deren automatisierte Generierung vorgestellt. Die Toolchain umfasst dabei die automatische Herstellung und Konvertierung von Videos, deren Simulation durch alle vorgegebenen Netzwerke mittels der drei eingeführten Adaptionsverfah- ren sowie die Bewertung des simulierten Streamingvorganges mit Hilfe von sieben vorgegebenen unterschiedlichen QoE-Modellen. Mit dieser Toolchain wurden fast 3 Millionen Streamingprozesse generiert, die auf die einzelnen Verfahren verteilt sind. Neben der Simulation der herkömmlichen Verfahren wurde eine neue Simulati- onsmethode trainiert, welche die herkömmlichen Vorgehensweisen der Algorithmen BBA0, FESTIVE und PANDA kombiniert. Das neue Verfahren fand heraus, dass man im Schnitt die gleiche durchschnittliche QoE erhält wie das beste herkömmliche Verfahren, wenn man immer nur die zwei höchsten Bitraten wählt. Aus diesem Ver- halten ließ sich schlussfolgern, dass die Analyse der verwendeten QoE-Modelle und deren möglichst optimale Ausprägung auf dem verwendeten Datensatz essentiell für maschinelles Lernen in diesem Bereich ist. Aus diesem Grund empfiehlt diese Arbeit, dass bevor weitere maschinelle Lernver- fahren auf adaptive Streaming-Daten angewendet werden, zuerst die exsistierenden QoE-Modelle und deren Verhalten genauer untersucht werden sollten. Für diese Un- tersuchungen stellt die im Rahmen dieser Arbeit entwickelte Toolchain ein wertvolles Hilfsmittel dar, da sie die schnelle Generierung von Streaming-Daten und deren Be- wertung anhand von sieben verschiedenen QoE-Modellen ermöglicht.
  @mastersthesis{info3-master-2019-4, abstract = {Ziel dieser Arbeit war es, die Einsatzmöglichkeiten maschinellen Lernens im Bereich des adaptiven Videostreamings zu analysieren und entsprechende Grundlagen zu schaffen. Insbesondere zielt die Arbeit darauf ab, im großen Stil Streaming-Daten synthetisch zu generieren, die als Eingabe für maschinelles Lernen verwendet werden können. Zu diesem Zweck beginnt die Ausarbeitung damit, Grundlagen und Verfah- ren zu erklären, sowie eine Auswahl aus verwandten Arbeiten zu treffen, um daraus wertvolle Ideen abzuleiten. Einer der wichtigsten Begriffe in diesem Zusammenhang war die Definition und Abstraktion des adaptiven Video-Streamings. Hierbei wurden verschiedene Streaming-Adapationsalgorithmen modelliert und neu implementiert, die die Bitrate für die Filmsegemente, die sogenannten Chunks, bestimmen. Ähnlich wichtig war der Begriff der Quality of Experience, die im weiteren Verlauf der Ar- beit als Bewertungsmethode für das Streaming-Erlebnis beim Benutzer diente. Es wurde zu Beginn ein Überblick über die verschiedenen bekannten Verfahren aus der Literatur gegeben. Anschließend wurden die technischen Details, die möglichen Eingabeparameter und die Auswirkungen der verschiedenen Bewertungsverfahren diskutiert. Die Arbeit nutzt lediglich vorhandene QoE-Modelle aus der Literatur. Die Erstellung und Validierung von neuen QoE-Modellen ist nicht Gegenstand der aktuellen Arbeit. Im Hinblick auf verwandte Arbeiten wurden Arbeiten von Orsolic et al. und Mao et al. herangezogen. Als Ergebnis daraus wurden, mit Blick auf das geplante Vor- haben, folgende Ziele aufgstellt: einen umfangreichen Datensatz mit dem Verhalten verschiedener Adaptionsalgorithmen in stark flukturierenden Netzwerken zu generie- ren, geeignete Kombinationen von Algorithmen zu testen und einen globalen Ansatz zur Optimierung von Video-Streaming-Vorgängen mit Hilfe von Ensemble-Learning zu finden. Das erste Ziel war folglich, einen entsprechend großen inhomogenen Streaming- Datensatz für zukünftige Forschungsarbeiten bereitzustellen. Ein möglicher Ansatz bestand darin, dies mit Hilfe von synthetisch generierten Daten zu realisieren. Dazu wurde die synthetische Erzeugung von Streaming-Daten untersucht, um eine Metho- de zur schnellen Herstellung von Streaming-Daten zu erhalten. Zu diesem Zweck wur- de eine Simulation entwickelt, die das Verhalten der Adaptionsalgorithmen BBA0, FESTIVE und PANDA für ein bestimmtes Video in einem bestimmten Netzwerk, mittels eines generalisierten Modelles, berechnet. Um die Genauigkeit dieser Simu- lation zu überprüfen, wurden für jeden Algorithmus drei Streaming-Prozesse real durchgeführt und in der Simulation nachgestellt. Der Vergleich des simulierten und realen Streaming-Prozesses zeigte eine gute Übereinstimmung zwischen Simulati- on und Realität und außerdem, dass ein Adaptionsverfahren umso besser simuliert werden kann, je mehr es die zeitliche Entwicklung der Parameter berücksichtigt. Mit dem Begriff Quality of Experience (QoE) wurde eine Möglichkeit zur Bewertung der simulierten Streamingvorgänge genutzt und anschließend wurden gängige QoE-Verfahren vorgestellt, aus denen eine begründete Auswahl getroffen wurde. Um mit der Simulation möglichst viele Streaming-Daten zu erzeugen, wurde eine Toolchain für deren automatisierte Generierung vorgestellt. Die Toolchain umfasst dabei die automatische Herstellung und Konvertierung von Videos, deren Simulation durch alle vorgegebenen Netzwerke mittels der drei eingeführten Adaptionsverfah- ren sowie die Bewertung des simulierten Streamingvorganges mit Hilfe von sieben vorgegebenen unterschiedlichen QoE-Modellen. Mit dieser Toolchain wurden fast 3 Millionen Streamingprozesse generiert, die auf die einzelnen Verfahren verteilt sind. Neben der Simulation der herkömmlichen Verfahren wurde eine neue Simulati- onsmethode trainiert, welche die herkömmlichen Vorgehensweisen der Algorithmen BBA0, FESTIVE und PANDA kombiniert. Das neue Verfahren fand heraus, dass man im Schnitt die gleiche durchschnittliche QoE erhält wie das beste herkömmliche Verfahren, wenn man immer nur die zwei höchsten Bitraten wählt. Aus diesem Ver- halten ließ sich schlussfolgern, dass die Analyse der verwendeten QoE-Modelle und deren möglichst optimale Ausprägung auf dem verwendeten Datensatz essentiell für maschinelles Lernen in diesem Bereich ist. Aus diesem Grund empfiehlt diese Arbeit, dass bevor weitere maschinelle Lernver- fahren auf adaptive Streaming-Daten angewendet werden, zuerst die exsistierenden QoE-Modelle und deren Verhalten genauer untersucht werden sollten. Für diese Un- tersuchungen stellt die im Rahmen dieser Arbeit entwickelte Toolchain ein wertvolles Hilfsmittel dar, da sie die schnelle Generierung von Streaming-Daten und deren Be- wertung anhand von sieben verschiedenen QoE-Modellen ermöglicht.}, author = {Prantl, Thomas}, keywords = {myown machine_learning can}, month = 3, school = {University of Würzburg}, title = {Machine Learning for Synthetically Generated, Adaptive Streaming Data}, year = 2019 }
• Popp, C.: Measurement and Analysis of QoE Influencing Factors for WebRTC, (2019).
  [ Abstract ] [ BibTeX ]
   
  Web Real-Time-Communication (WebRTC) beinhaltet eine Reihe neuartiger Tech- nologien und Standards zur qualitativ hochwertigen Audio-, Video- und Datenüber- tragung zwischen Web-Nutzern und Nutzergruppen. Alles wird under der Prämisse der Echtzeitkommunikation übertragen, so dass Interaktivität ermöglicht wird, also der Dialog und Wechselbeziehung zwischen Nutzern für alle drei Arten der Übertra- gung in WebRTC. So erlaubt WebRTC hiermit das Chatten, Telefonieren, Video- Telefonieren, Screensharing, Webinars und Video-Games im Browser unabhängig von der zugrunde liegenden Hardwareplattform, sei es mit Hilfe von Web- oder mobilen Anwendungen ohne dass zusätzliche Plugins erforderlich sind. Hierfür ver- wendet WebRTC eine Kommunikationsarchitektur die Datenübertragung auf zwei Wegen ermöglicht. Eine Möglichkeit ist die Verwendung eines zentralen Servers, der vom Dienstanbieter bereitgestellt werden muss. Daten an andere Clients in der Session werden über den Server an die entsprechenden Empfänger weitergeleitet (RELAY). Die zweite Möglichkeit ist die direkte Kommunikation der Clients unter- einander (P2P). Da es aufgrund der Verwendung von Network Address Translation (NAT) und Firewalls in der Regel unmöglich ist, direkt Daten an Clients in anderen Netzwerken zu schicken, verwendet WebRTC Interactive Connectivity Establish- ment (ICE), um direkte Kommunikation zu ermöglichen. WebRTC wird vom World Wide Web Consorcium (W3C) und von der Internet Engineering Task Force (IETF) entwickelt und standardisiert. Seit der initialen Veröffentlichung im Jahr 2011 wird WebRTC von einer Vielzahl bekannter Dienste zur Bereitstellung von Echtzeitkom- munikation verwendet. Zu diesen Diensten zählen u.a. Google Hangouts, Facebook Messenger und Citrix GoToMeeting. Diese Arbeit diskutiert Einflussfaktoren auf System und Netzwerkebene, welche die Quality of Experience (QoE) im Kontext von WebRTC beeinflussen. Basierend auf der Analyse bestehender Literatur zu den Themenbereichen Echtzeitkommu- nikation und QoE wurde eine Reihe an Parametern, welche die Nutzererfahrung beeinflussen, identifiziert. Mithilfe dieser Parameter wurden drei Metafaktoren Syn- chronität, Stabilität und Qualität definiert, welche für die QoE relevant sind. Diese werden mittels Key Performance Indikatoren (KPI) näher bestimmt. Jeder KPI be- trachtet einen spezifischen Aspekt des Metafaktors, zu welchem er gehört. Um das Verhalten der Metafaktoren zu untersuchen, wurde ein Mess-Framework implemen- tiert. Dieses ermöglicht automatische und replizierbare Messungen von WebRTC- Anwendungen im Browser. Im Rahmen dieser Messungen ist es möglich, das wie- dergegebene Video, die Dauer einzelner Messungen, die Anzahl an Teilnehmern, so- wie die Sendebandbreite zu definieren. Während der Messungen werden automatisch Messdaten gesammelt. Im Anschluss werden die Daten aller Teilnehmer automatisch auf einem Kontroll-PC gesammelt und für die Weiterverarbeitung organisiert. Das Framework steht öffentlich zum herunterladen bereit. Mithilfe des Mess-Frameworks wurden mehrere Messreihen mit zwei und drei Teilnehmern durchgeführt, um QoE Einflussfaktoren für WebRTC zu analysieren und näher zu bestimmen. Während der Messreihen wurde die Bandbreite zwischen 250 kbit/s and 50 Mbit/s variiert. Die allgemeine Evaluation der Messdaten zeigt, dass bei der Analyse der Einfluss- faktoren von Nutzerzufriedenheit und QoE zwischen den verschiedenen möglichen Kommunikationsmodi unterschieden werden muss. Falls an einer Session nur zwei Teilnehmer teilnehmen, wird im Laufe der Session von RELAY zu P2P-Kommuni- kation gewechselt. Gibt es hingegen drei Teilnehmer, wird während der gesamten Session mittels RELAY kommuniziert. Dies trifft für die implementierte ICE- und WebRTC-Serverinfrastruktur mit jitsi-Server und Chrome-Browser beim Client zu. Hiermit wird die Datenmenge, welche von einem einzelnen Client gesendet werden muss, reduziert. Vergleicht man die RELAY und die P2P-Phase von einer Messung mit zwei Teilnehmern, ist auffällig, dass die RELAY-Phase unabhängig von der Netz- werkbandbreite eine konstant hohe Stabilität der erfassten Parameter aufweist. Die P2P-Phase hingegen benötigt eine gewisse Mindestbandbreite, um diese Stabilität zu erreichen. In der P2P-Phase ist die maximal erreichbare Videobitrate allerdings höher, was die Nutzerzufriedenheit laut QoE-Studien beeinflussen kann. Messungen mit drei Teilnehmern weisen ein Verhalten vergleichbar mit der RELAY Phase von Messungen mit zwei Teilnehmern auf. Im Bezug auf den Metafaktor Synchronität ist auffällig, dass für alle Phasen und sowohl mit zwei, als auch mit drei Teilnehmern, eine Mindestbandbreite von 500 kbit/s notwendig ist, um eine gute Bewertung der Synchronität zu erreichen. Eine Ausnahme hiervon bildet die Audio/Video-Synchronisation. Diese erfordert im Fall von zwei Teilnehmern eine Mindestbandbreite von 2.0 Mbit/s. Nehmen drei Cli- ents an der Messung teil, sind die erreichten Werte für die Audio/Video-Synchronität durchgängig schlechter als für zwei Clients. Der zweite Metafaktor ist Stabilität. Für diesen gibt es größere Unterschiede be- zogen auf das Verhalten von RELAY und P2P-Phase. Während der RELAY-Phase werden durchgängig hohe Werte für die verschiedenen KPIs berechnet. Die berech- neten Werte ändern sich zeitweise, allerdings sind sie dennoch konstant höher als die Werte der P2P-Phase. Bezogen auf den KPI Auflösung, liegt der Haupgrund für die schlechte Bewertung der P2P-Phase in der Art und Weise, wie die Videoauflösung an die verfügbare Bandbreite angepasst wird. Im Fall des zweiten KPIs, welcher die Videoauflösung betrachtet, zeigt die P2P-Phase ein Verhalten ähnlich zum ersten Metaparameter. Geringe Bandbreiten führen zu schlechten Werten. Mit steigender Bandbreite verbessern sich diese und bleiben nach dem Erreichen des Maximums konstant. Aufgrund des beschriebenen Verhaltens wird die Stabilität der RELAY- Phase konstant besser bewertet als die der P2P-Phase. Messungen mit zwei Teil- nehmern zeigen ein Verhalten ähnlich der RELAY-Phase von Messungen mit zwei Teilnehmern. Qualität ist der dritter Metafaktor. Unabhängig von der konfigurierten Bandbrei- te erreicht die P2P-Phase hier immer bessere Bewertungen als die RELAY-Phase, was auch im angegeben Modell in der Arbeit durch Zahlen bestätigt wird. Zwi- schen der Bewertung von Audio- und Videodaten gibt es signifikante Unterschiede. Aufgrund technischer Einschränkungen unterstützt das Messframework keine Wie- dergabe von Audio. Das führt dazu, dass automatisch eine regelmäßige Abfolge von Pieptönen wiedergegeben wird. Wir vermuten, dass dies dazu führt, dass der Audio Adaptionsmechanismus von WebRTC nicht funktioniert. Aufgrund dieser Annahme betrachten wir die Audioqualität als konstanten Faktor. Der zweite KPI, welcher die Qualität betrifft, behandelt die Videoqualität. Sofern die verfügbare Bandbrei- te größer als 2.0 Mbit/s ist, erreicht die P2P-Phase konstant bessere Werte als die RELAY-Phase. Andernfalls sind die Werte der beiden Phasen vergleichbar. Hohe Bandbreiten zeigen eine Limitierung der RELAY-Phase bezüglich der Videobitrate. Wir vermuten, dass es sich hierbei um Limitierungen handelt, welche vom Betreiber des Dienstes eingerichtet wurden. Die Messungen mit drei Teilnehmern zeigen ein ähnliches Verhalten wie die RELAY Phase, allerdings sind die maximal erreichten Bitraten pro Video geringer. Zuletzt definieren wir eine simple Abschätzungsfunktion QoE simple für die QoE von WebRTC aufgrund unserer bisherigen Analyse für die Infrastruktur unseres Frameworks. Diese ist definiert als der Durchschnitt der Metafaktoren. Die berech- neten Werte für QoE simple zeigen, dass die RELAY-Phase für geringe Bandbreiten geringfügig bessere Werte erreicht. Im Fall höherer Bandbreiten ergibt sich ein Vor- teil zugunsten der P2P-Phase. Das Modell erlaubt WebRTC-Anbietern und Provi- dern die Abschätzung der QoE über eine simple Messung von Einflussfaktoren. Die subjektive Validierung des Modells wird in einer nächsten Arbeit angegangen. Alle Metafakotoren wurden aufgrund des bisherigen Stands der Technik in der Literatur ausgewählt und eingebunden.
  @mastersthesis{info3-master-2019-5, abstract = {Web Real-Time-Communication (WebRTC) beinhaltet eine Reihe neuartiger Tech- nologien und Standards zur qualitativ hochwertigen Audio-, Video- und Datenüber- tragung zwischen Web-Nutzern und Nutzergruppen. Alles wird under der Prämisse der Echtzeitkommunikation übertragen, so dass Interaktivität ermöglicht wird, also der Dialog und Wechselbeziehung zwischen Nutzern für alle drei Arten der Übertra- gung in WebRTC. So erlaubt WebRTC hiermit das Chatten, Telefonieren, Video- Telefonieren, Screensharing, Webinars und Video-Games im Browser unabhängig von der zugrunde liegenden Hardwareplattform, sei es mit Hilfe von Web- oder mobilen Anwendungen ohne dass zusätzliche Plugins erforderlich sind. Hierfür ver- wendet WebRTC eine Kommunikationsarchitektur die Datenübertragung auf zwei Wegen ermöglicht. Eine Möglichkeit ist die Verwendung eines zentralen Servers, der vom Dienstanbieter bereitgestellt werden muss. Daten an andere Clients in der Session werden über den Server an die entsprechenden Empfänger weitergeleitet (RELAY). Die zweite Möglichkeit ist die direkte Kommunikation der Clients unter- einander (P2P). Da es aufgrund der Verwendung von Network Address Translation (NAT) und Firewalls in der Regel unmöglich ist, direkt Daten an Clients in anderen Netzwerken zu schicken, verwendet WebRTC Interactive Connectivity Establish- ment (ICE), um direkte Kommunikation zu ermöglichen. WebRTC wird vom World Wide Web Consorcium (W3C) und von der Internet Engineering Task Force (IETF) entwickelt und standardisiert. Seit der initialen Veröffentlichung im Jahr 2011 wird WebRTC von einer Vielzahl bekannter Dienste zur Bereitstellung von Echtzeitkom- munikation verwendet. Zu diesen Diensten zählen u.a. Google Hangouts, Facebook Messenger und Citrix GoToMeeting. Diese Arbeit diskutiert Einflussfaktoren auf System und Netzwerkebene, welche die Quality of Experience (QoE) im Kontext von WebRTC beeinflussen. Basierend auf der Analyse bestehender Literatur zu den Themenbereichen Echtzeitkommu- nikation und QoE wurde eine Reihe an Parametern, welche die Nutzererfahrung beeinflussen, identifiziert. Mithilfe dieser Parameter wurden drei Metafaktoren Syn- chronität, Stabilität und Qualität definiert, welche für die QoE relevant sind. Diese werden mittels Key Performance Indikatoren (KPI) näher bestimmt. Jeder KPI be- trachtet einen spezifischen Aspekt des Metafaktors, zu welchem er gehört. Um das Verhalten der Metafaktoren zu untersuchen, wurde ein Mess-Framework implemen- tiert. Dieses ermöglicht automatische und replizierbare Messungen von WebRTC- Anwendungen im Browser. Im Rahmen dieser Messungen ist es möglich, das wie- dergegebene Video, die Dauer einzelner Messungen, die Anzahl an Teilnehmern, so- wie die Sendebandbreite zu definieren. Während der Messungen werden automatisch Messdaten gesammelt. Im Anschluss werden die Daten aller Teilnehmer automatisch auf einem Kontroll-PC gesammelt und für die Weiterverarbeitung organisiert. Das Framework steht öffentlich zum herunterladen bereit. Mithilfe des Mess-Frameworks wurden mehrere Messreihen mit zwei und drei Teilnehmern durchgeführt, um QoE Einflussfaktoren für WebRTC zu analysieren und näher zu bestimmen. Während der Messreihen wurde die Bandbreite zwischen 250 kbit/s and 50 Mbit/s variiert. Die allgemeine Evaluation der Messdaten zeigt, dass bei der Analyse der Einfluss- faktoren von Nutzerzufriedenheit und QoE zwischen den verschiedenen möglichen Kommunikationsmodi unterschieden werden muss. Falls an einer Session nur zwei Teilnehmer teilnehmen, wird im Laufe der Session von RELAY zu P2P-Kommuni- kation gewechselt. Gibt es hingegen drei Teilnehmer, wird während der gesamten Session mittels RELAY kommuniziert. Dies trifft für die implementierte ICE- und WebRTC-Serverinfrastruktur mit jitsi-Server und Chrome-Browser beim Client zu. Hiermit wird die Datenmenge, welche von einem einzelnen Client gesendet werden muss, reduziert. Vergleicht man die RELAY und die P2P-Phase von einer Messung mit zwei Teilnehmern, ist auffällig, dass die RELAY-Phase unabhängig von der Netz- werkbandbreite eine konstant hohe Stabilität der erfassten Parameter aufweist. Die P2P-Phase hingegen benötigt eine gewisse Mindestbandbreite, um diese Stabilität zu erreichen. In der P2P-Phase ist die maximal erreichbare Videobitrate allerdings höher, was die Nutzerzufriedenheit laut QoE-Studien beeinflussen kann. Messungen mit drei Teilnehmern weisen ein Verhalten vergleichbar mit der RELAY Phase von Messungen mit zwei Teilnehmern auf. Im Bezug auf den Metafaktor Synchronität ist auffällig, dass für alle Phasen und sowohl mit zwei, als auch mit drei Teilnehmern, eine Mindestbandbreite von 500 kbit/s notwendig ist, um eine gute Bewertung der Synchronität zu erreichen. Eine Ausnahme hiervon bildet die Audio/Video-Synchronisation. Diese erfordert im Fall von zwei Teilnehmern eine Mindestbandbreite von 2.0 Mbit/s. Nehmen drei Cli- ents an der Messung teil, sind die erreichten Werte für die Audio/Video-Synchronität durchgängig schlechter als für zwei Clients. Der zweite Metafaktor ist Stabilität. Für diesen gibt es größere Unterschiede be- zogen auf das Verhalten von RELAY und P2P-Phase. Während der RELAY-Phase werden durchgängig hohe Werte für die verschiedenen KPIs berechnet. Die berech- neten Werte ändern sich zeitweise, allerdings sind sie dennoch konstant höher als die Werte der P2P-Phase. Bezogen auf den KPI Auflösung, liegt der Haupgrund für die schlechte Bewertung der P2P-Phase in der Art und Weise, wie die Videoauflösung an die verfügbare Bandbreite angepasst wird. Im Fall des zweiten KPIs, welcher die Videoauflösung betrachtet, zeigt die P2P-Phase ein Verhalten ähnlich zum ersten Metaparameter. Geringe Bandbreiten führen zu schlechten Werten. Mit steigender Bandbreite verbessern sich diese und bleiben nach dem Erreichen des Maximums konstant. Aufgrund des beschriebenen Verhaltens wird die Stabilität der RELAY- Phase konstant besser bewertet als die der P2P-Phase. Messungen mit zwei Teil- nehmern zeigen ein Verhalten ähnlich der RELAY-Phase von Messungen mit zwei Teilnehmern. Qualität ist der dritter Metafaktor. Unabhängig von der konfigurierten Bandbrei- te erreicht die P2P-Phase hier immer bessere Bewertungen als die RELAY-Phase, was auch im angegeben Modell in der Arbeit durch Zahlen bestätigt wird. Zwi- schen der Bewertung von Audio- und Videodaten gibt es signifikante Unterschiede. Aufgrund technischer Einschränkungen unterstützt das Messframework keine Wie- dergabe von Audio. Das führt dazu, dass automatisch eine regelmäßige Abfolge von Pieptönen wiedergegeben wird. Wir vermuten, dass dies dazu führt, dass der Audio Adaptionsmechanismus von WebRTC nicht funktioniert. Aufgrund dieser Annahme betrachten wir die Audioqualität als konstanten Faktor. Der zweite KPI, welcher die Qualität betrifft, behandelt die Videoqualität. Sofern die verfügbare Bandbrei- te größer als 2.0 Mbit/s ist, erreicht die P2P-Phase konstant bessere Werte als die RELAY-Phase. Andernfalls sind die Werte der beiden Phasen vergleichbar. Hohe Bandbreiten zeigen eine Limitierung der RELAY-Phase bezüglich der Videobitrate. Wir vermuten, dass es sich hierbei um Limitierungen handelt, welche vom Betreiber des Dienstes eingerichtet wurden. Die Messungen mit drei Teilnehmern zeigen ein ähnliches Verhalten wie die RELAY Phase, allerdings sind die maximal erreichten Bitraten pro Video geringer. Zuletzt definieren wir eine simple Abschätzungsfunktion QoE simple für die QoE von WebRTC aufgrund unserer bisherigen Analyse für die Infrastruktur unseres Frameworks. Diese ist definiert als der Durchschnitt der Metafaktoren. Die berech- neten Werte für QoE simple zeigen, dass die RELAY-Phase für geringe Bandbreiten geringfügig bessere Werte erreicht. Im Fall höherer Bandbreiten ergibt sich ein Vor- teil zugunsten der P2P-Phase. Das Modell erlaubt WebRTC-Anbietern und Provi- dern die Abschätzung der QoE über eine simple Messung von Einflussfaktoren. Die subjektive Validierung des Modells wird in einer nächsten Arbeit angegangen. Alle Metafakotoren wurden aufgrund des bisherigen Stands der Technik in der Literatur ausgewählt und eingebunden.}, author = {Popp, Christian}, keywords = {myown webrtc can}, month = 3, school = {University of Würzburg}, title = {Measurement and Analysis of QoE Influencing Factors for WebRTC}, year = 2019 }
• Kryven, M., Ravsky, A., Wolff, A.: Drawing Graphs on Few Circles and Few Spheres. Journal of Graph Algorithms & Applications. 23, 371--391 (2019).
  [ Abstract ] [ BibTeX ] [ DOI ]
   
  Given a drawing of a graph, its emphvisual complexity is defined as the number of geometrical entities in the drawing, for example, the number of segments in a straight-line drawing or the number of arcs in a circular-arc drawing (in 2D). Recently, Chaplick et al. [GD 2016] introduced a different measure for the visual complexity, the emphaffine cover number, which is the minimum number of lines (or planes) that together cover a crossing-free straight-line drawing of a graph G in 2D (3D). In this paper, we introduce the emphspherical cover number, which is the minimum number of circles (or spheres) that together cover a crossing-free circular-arc drawing in 2D (or 3D). It turns out that spherical covers are sometimes significantly smaller than affine covers. For complete, complete bipartite, and platonic graphs, we analyze their spherical cover numbers and compare them to their affine cover numbers as well as their segment and arc numbers. We also link the spherical cover number to other graph parameters such as treewidth and linear arboricity.
  @article{krw-dgfcf-JGAA19, abstract = {Given a drawing of a graph, its \emph{visual complexity} is defined as the number of geometrical entities in the drawing, for example, the number of segments in a straight-line drawing or the number of arcs in a circular-arc drawing (in 2D). Recently, Chaplick et al.\ [GD 2016] introduced a different measure for the visual complexity, the \emph{affine cover number}, which is the minimum number of lines (or planes) that together cover a crossing-free straight-line drawing of a graph G in 2D (3D). In this paper, we introduce the \emph{spherical cover number}, which is the minimum number of circles (or spheres) that together cover a crossing-free circular-arc drawing in 2D (or 3D). It turns out that spherical covers are sometimes significantly smaller than affine covers. For complete, complete bipartite, and platonic graphs, we analyze their spherical cover numbers and compare them to their affine cover numbers as well as their segment and arc numbers. We also link the spherical cover number to other graph parameters such as treewidth and linear arboricity.}, author = {Kryven, Myroslav and Ravsky, Alexander and Wolff, Alexander}, journal = {Journal of Graph Algorithms \& Applications}, keywords = {csuniwue gd-info1 myown}, number = 2, pages = {371--391}, title = {Drawing Graphs on Few Circles and Few Spheres}, volume = 23, year = 2019 }
• Korger, A., Baumeister, J.: Case-Based Retrieval and Adaptation of Regulatory Documents and their Context. Proceedings of LWDA - Lernen. Wissen. Daten. Analysen 2019. S. 292-303. , Humboldt-Universität zu Berlin (2019).
  [ BibTeX ]
   
  @inproceedings{korger2019casebased, address = {Humboldt-Universität zu Berlin}, author = {Korger, Andreas and Baumeister, Joachim}, booktitle = {Proceedings of LWDA - Lernen. Wissen. Daten. Analysen 2019}, keywords = {myown}, month = {oct}, pages = {292-303}, title = {Case-Based Retrieval and Adaptation of Regulatory Documents and their Context}, year = 2019 }
• Zehe, A., Hettinger, L., Ernst, S., Hauptmann, C., Hotho, A.: Team Xenophilius Lovegood at SemEval-2019 Task 4: Hyperpartisanship Classification using Convolutional Neural Networks. Proceedings of The 13th International Workshop on Semantic Evaluation. Association for Computational Linguistics (2019).
  [ BibTeX ]
   
  @inproceedings{zehe2019xenophilius, author = {Zehe, Albin and Hettinger, Lena and Ernst, Stefan and Hauptmann, Christian and Hotho, Andreas}, booktitle = {Proceedings of The 13th International Workshop on Semantic Evaluation}, keywords = {2019 cnn hyperpartisan myown news nlp nn semeval}, publisher = {Association for Computational Linguistics}, title = {Team Xenophilius Lovegood at SemEval-2019 Task 4: Hyperpartisanship Classification using Convolutional Neural Networks}, year = 2019 }
• Lammers, S., Bente, G., Tepest, R., Jording, M., Roth, D., Vogeley, K.: Introducing ACASS: An Annotated Character Animation Stimulus Set for Controlled (e)Motion Perception Studies. Frontiers in Robotics and AI. 6, 94 (2019).
  [ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
   
  Others' movements inform us about their current activities as well as their intentions and emotions. Research on the distinct mechanisms underlying action recognition and emotion inferences has been limited due to a lack of suitable comparative stimulus material. Problematic confounds can derive from low-level physical features (e.g., luminance), as well as from higher-level psychological features (e.g., stimulus difficulty). Here we present a standardized stimulus dataset, which allows to address both action and emotion recognition with identical stimuli. The stimulus set consists of 792 computer animations with a neutral avatar based on full body motion capture protocols. Motion capture was performed on 22 human volunteers, instructed to perform six everyday activities (mopping, sweeping, painting with a roller, painting with a brush, wiping, sanding) in three different moods (angry, happy, sad). Five-second clips of each motion protocol were rendered into AVI-files using two virtual camera perspectives for each clip. In contrast to video stimuli, the computer animations allowed to standardize the physical appearance of the avatar and to control lighting and coloring conditions, thus reducing the stimulus variation to mere movement. To control for low level optical features of the stimuli, we developed and applied a set of MATLAB routines extracting basic physical features of the stimuli, including average background-foreground proportion and frame-by-frame pixel change dynamics. This information was used to identify outliers and to homogenize the stimuli across action and emotion categories. This led to a smaller stimulus subset (n = 83 animations within the 792 clip database) which only contained two different actions (mopping, sweeping) and two different moods (angry, happy). To further homogenize this stimulus subset with regard to psychological criteria we conducted an online observer study (N = 112 participants) to assess the recognition rates for actions and moods, which led to a final sub-selection of 32 clips (eight per category) within the database. The ACASS database and its subsets provide unique opportunities for research applications in social psychology, social neuroscience, and applied clinical studies on communication disorders. All 792 AVI-files, selected subsets, MATLAB code, annotations, and motion capture data (FBX-files) are available online.
  @article{10.3389/frobt.2019.00094, abstract = {Others' movements inform us about their current activities as well as their intentions and emotions. Research on the distinct mechanisms underlying action recognition and emotion inferences has been limited due to a lack of suitable comparative stimulus material. Problematic confounds can derive from low-level physical features (e.g., luminance), as well as from higher-level psychological features (e.g., stimulus difficulty). Here we present a standardized stimulus dataset, which allows to address both action and emotion recognition with identical stimuli. The stimulus set consists of 792 computer animations with a neutral avatar based on full body motion capture protocols. Motion capture was performed on 22 human volunteers, instructed to perform six everyday activities (mopping, sweeping, painting with a roller, painting with a brush, wiping, sanding) in three different moods (angry, happy, sad). Five-second clips of each motion protocol were rendered into AVI-files using two virtual camera perspectives for each clip. In contrast to video stimuli, the computer animations allowed to standardize the physical appearance of the avatar and to control lighting and coloring conditions, thus reducing the stimulus variation to mere movement. To control for low level optical features of the stimuli, we developed and applied a set of MATLAB routines extracting basic physical features of the stimuli, including average background-foreground proportion and frame-by-frame pixel change dynamics. This information was used to identify outliers and to homogenize the stimuli across action and emotion categories. This led to a smaller stimulus subset (n = 83 animations within the 792 clip database) which only contained two different actions (mopping, sweeping) and two different moods (angry, happy). To further homogenize this stimulus subset with regard to psychological criteria we conducted an online observer study (N = 112 participants) to assess the recognition rates for actions and moods, which led to a final sub-selection of 32 clips (eight per category) within the database. The ACASS database and its subsets provide unique opportunities for research applications in social psychology, social neuroscience, and applied clinical studies on communication disorders. All 792 AVI-files, selected subsets, MATLAB code, annotations, and motion capture data (FBX-files) are available online.}, author = {Lammers, Sebastian and Bente, Gary and Tepest, Ralf and Jording, Mathis and Roth, Daniel and Vogeley, Kai}, journal = {Frontiers in Robotics and AI}, keywords = {droth insync myown}, pages = 94, title = {Introducing ACASS: An Annotated Character Animation Stimulus Set for Controlled (e)Motion Perception Studies}, volume = 6, year = 2019 }
• Glémarec, Y., Bosser, A.-G., Lugrin, J.-L., Chollet, M., Buche, C., Landeck, M., Latoschik, M.E.: A Scalability Benchmark for a Virtual Audience Perception Model in Virtual Reality. Proceedings of the 25th ACM Conference on Virtual Reality Software and Technology (2019).
  [ BibTeX ] [ URL ]
   
  @inproceedings{glemarec2019scalability, author = {Glémarec, Yann and Bosser, Anne-Gwenn and Lugrin, Jean-Luc and Chollet, Mathieu and Buche, Cédric and Landeck, Maximilian and Latoschik, Marc Erich}, booktitle = {Proceedings of the 25th ACM Conference on Virtual Reality Software and Technology}, keywords = {myown}, title = {A Scalability Benchmark for a Virtual Audience Perception Model in Virtual Reality}, volume = {VRST'19}, year = 2019 }
• Hamzeheinejad, N.: VR Simulation as a Motivator in Gait Rehabilitation. Proceedings of the 26th IEEE Virtual Reality (VR) conference. IEEE (2019).
  [ Abstract ] [ BibTeX ] [ URL ]
   
  Gait rehabilitation is a necessary process for patients suffering from post-stroke motor impairments. The patients are required to perform repetitive practices using a robot-assisted gait device. Repeated exercises can become extremely frustrating and the patients lose their motivation over time. In my PhD research, I focus on Virtual Reality (VR) as a medium to improve gait rehabilitation in terms of enjoyment, motivation, efficiency, and effectiveness. The objective is to systematically investigate different factors, such as the presence of a trainer, interactivity, gamification, and storytelling in a two-step process. First, by evaluating the applicability of different factors for the clinical use with healthy subjects. Second, by evaluating the effectiveness of the VR simulation with patients with gait deficits, especially stroke patients in collaboration with a [country] clinic.
  @inproceedings{hamzeheinejad2019simulation, abstract = {Gait rehabilitation is a necessary process for patients suffering from post-stroke motor impairments. The patients are required to perform repetitive practices using a robot-assisted gait device. Repeated exercises can become extremely frustrating and the patients lose their motivation over time. In my PhD research, I focus on Virtual Reality (VR) as a medium to improve gait rehabilitation in terms of enjoyment, motivation, efficiency, and effectiveness. The objective is to systematically investigate different factors, such as the presence of a trainer, interactivity, gamification, and storytelling in a two-step process. First, by evaluating the applicability of different factors for the clinical use with healthy subjects. Second, by evaluating the effectiveness of the VR simulation with patients with gait deficits, especially stroke patients in collaboration with a [country] clinic.}, author = {Hamzeheinejad, Negin}, booktitle = {Proceedings of the 26th IEEE Virtual Reality (VR) conference}, keywords = {ieee2019 myown vrgait}, publisher = {IEEE}, title = {VR Simulation as a Motivator in Gait Rehabilitation}, year = 2019 }
• Oberdörfer, S., Heidrich, D., Latoschik, M.E.: Usability of Gamified Knowledge Learning in VR and Desktop-3D. Proceedings of CHI 2019. S. 175 ff. (2019).
  [ BibTeX ] [ URL ]
   
  @inproceedings{oberdorfertobepublishedusability, author = {Oberdörfer, Sebastian and Heidrich, David and Latoschik, Marc Erich}, booktitle = {Proceedings of CHI 2019}, keywords = {chi2019 getit myown oberdoerfer}, pages = {175 ff.}, title = {Usability of Gamified Knowledge Learning in VR and Desktop-3D}, year = 2019 }
• Vomhoff, V.: Reliability of Crowdsourced Measurements, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-praktikum-2019-12, author = {Vomhoff, Viktoria}, keywords = {myown}, month = 10, school = {Universitiy of Würzburg}, title = {Reliability of Crowdsourced Measurements}, year = 2019 }
• Supervisor: Schwind, A.: Potential Traffic Savings by Leveraging Proximity of Communication Groups in Mobile Messaging Applications, (2019).
  [ Abstract ] [ BibTeX ]
   
  Contact: anika.schwind@informatik.uni-wuerzburg.de
  @mastersthesis{info3-master-2019-8, abstract = {Contact: anika.schwind@informatik.uni-wuerzburg.de}, author = {Supervisor: Schwind, Anika}, keywords = {myown}, school = {University of Würzburg}, title = {Potential Traffic Savings by Leveraging Proximity of Communication Groups in Mobile Messaging Applications}, year = 2019 }
• Roth, D., von Mammen, S., Keil, J., Schildknecht, M., Latoschik, M.E.: Approaching Difficult Terrain with Sensitivity: A Virtual Reality Game on the Five Stages of Grief. (2019).
  [ BibTeX ]
   
  @proceedings{noauthororeditor2019approaching, author = {Roth, Daniel and von Mammen, Sebastian and Keil, Julian and Schildknecht, Manuel and Latoschik, Marc Erich}, keywords = {droth myown}, title = {Approaching Difficult Terrain with Sensitivity: A Virtual Reality Game on the Five Stages of Grief}, volume = {11th International Conference on Virtual Worlds and Games for Serious Applications (VS Games)}, year = 2019 }
• Feigl, T., Roth, D., Gradl, S., Wirth, M.G., Philippsen, M., Latoschik, M.E., Eskofier, B., Mutschler, C.: Sick Moves! Motion Parameters as Indicators of Simulator Sickness. IEEE Transactions on Visualization and Computer Graphics (TVCG). 25, 3146-3157 (2019).
  [ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
   
  We explore motion parameters, more specifically gait parameters, asan objective indicator to assess simulator sickness in Virtual Reality(VR). We discuss the potential relationships between simulator sick-ness, immersion, and presence. We used two different camera pose(position and orientation) estimation methods for the evaluation ofmotion tasks in a large-scale VR environment: a simple model andan optimized model that allows for a more accurate and natural map-ping of human senses. Participants performed multiple motion tasks(walking, balancing, running) in three conditions: a physical realitybaseline condition, a VR condition with the simple model, and a VRcondition with the optimized model. We compared these conditionswith regard to the resulting sickness and gait, as well as the perceivedpresence in the VR conditions. The subjective measures confirmedthat the optimized pose estimation model reduces simulator sick-ness and increases the perceived presence. The results further showthat both models affect the gait parameters and simulator sickness,which is why we further investigated a classification approach thatdeals with non-linear correlation dependencies between gait param-eters and simulator sickness. We argue that our approach could beused to assess and predict simulator sickness based on human gaitparameters and we provide implications for future research
  @article{feigl2019toappearmoves, abstract = {We explore motion parameters, more specifically gait parameters, asan objective indicator to assess simulator sickness in Virtual Reality(VR). We discuss the potential relationships between simulator sick-ness, immersion, and presence. We used two different camera pose(position and orientation) estimation methods for the evaluation ofmotion tasks in a large-scale VR environment: a simple model andan optimized model that allows for a more accurate and natural map-ping of human senses. Participants performed multiple motion tasks(walking, balancing, running) in three conditions: a physical realitybaseline condition, a VR condition with the simple model, and a VRcondition with the optimized model. We compared these conditionswith regard to the resulting sickness and gait, as well as the perceivedpresence in the VR conditions. The subjective measures confirmedthat the optimized pose estimation model reduces simulator sick-ness and increases the perceived presence. The results further showthat both models affect the gait parameters and simulator sickness,which is why we further investigated a classification approach thatdeals with non-linear correlation dependencies between gait param-eters and simulator sickness. We argue that our approach could beused to assess and predict simulator sickness based on human gaitparameters and we provide implications for future research}, author = {Feigl, Tobias and Roth, Daniel and Gradl, Stefan and Wirth, Markus Gerhard and Philippsen, Michael and Latoschik, Marc Erich and Eskofier, Bjoern and Mutschler, Christopher}, journal = {IEEE Transactions on Visualization and Computer Graphics (TVCG)}, keywords = {droth myown}, month = {November}, number = 11, pages = {3146-3157}, title = {Sick Moves! Motion Parameters as Indicators of Simulator Sickness}, volume = 25, year = 2019 }
• Borchert, K., Hirth, M., Stellzig-Eisenhauer, A., Kunz, F.: Crowd-based Assessment of Deformational Cranial Asymmetries. International Workshop on Crowd-Powered e-Services (CROPS). , Trondheim, Norway (2019).
  [ BibTeX ]
   
  @inproceedings{info3-inproceedings-2019-17, address = {Trondheim, Norway}, author = {Borchert, Kathrin and Hirth, Matthias and Stellzig-Eisenhauer, Angelika and Kunz, Felix}, booktitle = {International Workshop on Crowd-Powered e-Services (CROPS)}, keywords = {myown ua-net}, month = 9, title = {Crowd-based Assessment of Deformational Cranial Asymmetries}, year = 2019 }
• Göritz, A., Borchert, K., Hirth, M.: Using Attention Testing to Select Crowdsourced Workers and Research Participants. Social Science Computer Review. (2019).
  [ BibTeX ]
   
  @article{info3-article-2019-7, author = {Göritz, Anja and Borchert, Kathrin and Hirth, Matthias}, journal = {Social Science Computer Review}, keywords = {myown}, month = 6, title = {Using Attention Testing to Select Crowdsourced Workers and Research Participants}, year = 2019 }
• Steinhaeusser, S.C., Riedmann, A., Haller, M., Oberdörfer, S., Bucher, K., Latoschik, M.E.: Fancy Fruits - An Augmented Reality Application for Special Needs Education. Proceedings of the 11th International Conference on Virtual Worlds and Games for Serious Applications (VS Games 2019). IEEE (2019).
  [ BibTeX ] [ URL ]
   
  @inproceedings{steinhaeusser2019fancy, author = {Steinhaeusser, Sophia C and Riedmann, Anna and Haller, Max and Oberdörfer, Sebastian and Bucher, Kristina and Latoschik, Marc Erich}, booktitle = {Proceedings of the 11th International Conference on Virtual Worlds and Games for Serious Applications (VS Games 2019)}, keywords = {myown oberdoerfer riedmann}, month = {September}, publisher = {IEEE}, title = {Fancy Fruits - An Augmented Reality Application for Special Needs Education}, year = 2019 }
• Aschenbrenner, D., Leutert, F., Cencen, A., Verlinden, J., Schilling, K., Latoschik, M.E., Lukosch, S.: Comparing Human Factors for Augmented Reality supported Single and Cooperative Repair Operations of Industrial Robots. Frontiers in Robotics and AI. 6, 37 (2019).
  [ Abstract ] [ BibTeX ] [ URL ]
   
  In order to support the decision-making process of industry on how to implement Augmented Reality (AR) in production, this article wants to provide guidance through a set of comparative user studies. The results are obtained from the feedback of 160 participants who performed the same repair task on a switch cabinet of an industrial robot. The studies compare several AR instruction applications on different display devices (head-mounted display, handheld tablet PC and projection-based spatial AR) with baseline conditions (paper instructions and phone support), both in a single-user and a collaborative setting. Next to insights on the performance of the individual device types for the single mode operation, the study is able to show significant indications on AR techniques are being especially helpful in a collaborative setting.
  @article{aschenbrenner2019comparing, abstract = {In order to support the decision-making process of industry on how to implement Augmented Reality (AR) in production, this article wants to provide guidance through a set of comparative user studies. The results are obtained from the feedback of 160 participants who performed the same repair task on a switch cabinet of an industrial robot. The studies compare several AR instruction applications on different display devices (head-mounted display, handheld tablet PC and projection-based spatial AR) with baseline conditions (paper instructions and phone support), both in a single-user and a collaborative setting. Next to insights on the performance of the individual device types for the single mode operation, the study is able to show significant indications on AR techniques are being especially helpful in a collaborative setting.}, author = {Aschenbrenner, Doris and Leutert, Florian and Cencen, Argun and Verlinden, Jouke and Schilling, Klaus and Latoschik, Marc Erich and Lukosch, Stephan}, journal = {Frontiers in Robotics and AI}, keywords = {marc myown}, pages = 37, publisher = {Frontiers}, title = {Comparing Human Factors for Augmented Reality supported Single and Cooperative Repair Operations of Industrial Robots}, volume = 6, year = 2019 }
• Dworschak, N.-D.: Evaluating Temporal Impairments in Music Streaming, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-bachelor-2019-11, author = {Dworschak, Nemo-Dario}, keywords = {myown}, school = {University of Würzburg}, title = {Evaluating Temporal Impairments in Music Streaming}, year = 2019 }
• Moldovan, C.: Energy-Efficient Adaptation Logic for HTTP Streaming in Mobile Networks. , 2019 International Conference on Networked Systems (NetSys), Garching, Germany (2019).
  [ BibTeX ]
   
  @presentation{info3-presentation-2019-7, address = {2019 International Conference on Networked Systems (NetSys), Garching, Germany}, author = {Moldovan, Christian}, keywords = {myown}, month = 3, title = {Energy-Efficient Adaptation Logic for HTTP Streaming in Mobile Networks}, year = 2019 }
• Seufert, M.: Research Activities Report for "Managing Web & Cloud QoE TF". , 13th Qualinet General Meeting, Berlin, Germany (2019).
  [ BibTeX ]
   
  @presentation{info3-presentation-2019-3, address = {13th Qualinet General Meeting, Berlin, Germany}, author = {Seufert, Michael}, keywords = {myown}, month = 6, title = {Research Activities Report for "Managing Web & Cloud QoE TF"}, year = 2019 }
• Eckstein, B., Niebling, F., Lugrin, B.: Reflected Reality: A Mixed Reality Knowledge Representation for Context-aware Systems. 11th International Conference on Virtual Worlds and Games for Serious Applications (VS-Games) (2019).
  [ BibTeX ]
   
  @conference{eckstein2019reflected, author = {Eckstein, Benjamin and Niebling, Florian and Lugrin, Birgit}, booktitle = {11th International Conference on Virtual Worlds and Games for Serious Applications (VS-Games)}, keywords = {birgit mi myown}, note = {accepted for publication}, title = {Reflected Reality: A Mixed Reality Knowledge Representation for Context-aware Systems}, year = 2019 }
• Roth, D., Westermeier, F., Brübach, L., Feigl, T., Schell, C., Latoschik, M.E.: Brain 2 Communicate: EEG-based Affect Recognition to Augment Virtual Social Interactions. Mensch und Computer 2019 - Workshopband. Gesellschaft für Informatik e.V., Bonn (2019).
  [ BibTeX ] [ URL ] [ DOI ]
   
  @conference{roth2019toappearbrain, address = {Bonn}, author = {Roth, Daniel and Westermeier, Franziska and Brübach, Larissa and Feigl, Tobias and Schell, Christian and Latoschik, Marc Erich}, booktitle = {Mensch und Computer 2019 - Workshopband}, keywords = {droth injectx insync myown}, publisher = {Gesellschaft für Informatik e.V.}, title = {Brain 2 Communicate: EEG-based Affect Recognition to Augment Virtual Social Interactions}, year = 2019 }
• Oberdörfer, S., Latoschik, M.E.: Predicting Learning Effects of Computer Games Using the Gamified Knowledge Encoding Model. Entertainment Computing. 32, (2019).
  [ BibTeX ] [ URL ] [ DOI ]
   
  @article{oberdorfer2019predicting, author = {Oberdörfer, Sebastian and Latoschik, Marc Erich}, editor = {Rauterberg, Matthias and Liarokapis, Fotis}, journal = {Entertainment Computing}, keywords = {myown oberdoerfer}, title = {Predicting Learning Effects of Computer Games Using the Gamified Knowledge Encoding Model}, volume = 32, year = 2019 }
• Firman, O., Kindermann, P., Ravsky, A., Wolff, A., Zink, J.: Computing Optimal Tangles Faster. In: Löffler, M. (hrsg.) Proc. 35th European Workshop on Computational Geometry (EuroCG'19). S. 61:1--7 (2019).
  [ BibTeX ]
   
  @inproceedings{fkrwz-cotf-EuroCG19, author = {Firman, Oksana and Kindermann, Philipp and Ravsky, Alexander and Wolff, Alexander and Zink, Johannes}, booktitle = {Proc. 35th European Workshop on Computational Geometry (EuroCG'19)}, editor = {L{ö}ffler, Maarten}, keywords = {csuniwue myown}, pages = {61:1--7}, title = {Computing Optimal Tangles Faster}, year = 2019 }
• Evans, W., Rzka.zewski, P., Saeedi, N., Shin, C.-S., Wolff, A.: Representing Graphs and Hypergraphs by Touching Polygons in 3D. In: Archambault, D. und Tóth, C.D. (hrsg.) Proc. 27th Int. Symp. Graph Drawing & Network Vis. (GD'19). Springer-Verlag (2019).
  [ BibTeX ]
   
  @inproceedings{erssw-rghtp-GD19, author = {Evans, William and Rz\k{a}\.zewski, Pawe\l and Saeedi, Noushin and Shin, Chan-Su and Wolff, Alexander}, booktitle = {Proc. 27th Int. Symp. Graph Drawing \& Network Vis. (GD'19)}, editor = {Archambault, Daniel and T{ó}th, Csaba D.}, keywords = {csuniwue myown}, note = {To appear.}, publisher = {Springer-Verlag}, series = {Lecture Notes in Computer Science}, title = {Representing Graphs and Hypergraphs by Touching Polygons in 3D}, year = 2019 }
• Chaplick, S., Förster, H., Kryven, M., Wolff, A.: On Arrangements of Orthogonal Circles. In: Archambault, D. und Tóth, C.D. (hrsg.) Proc. 27th Int. Symp. Graph Drawing & Network Vis. (GD'19). Springer-Verlag (2019).
  [ BibTeX ]
   
  @inproceedings{cfkw-aoc-GD19, author = {Chaplick, Steven and F{ö}rster, Henry and Kryven, Myroslav and Wolff, Alexander}, booktitle = {Proc. 27th Int. Symp. Graph Drawing \& Network Vis. (GD'19)}, editor = {Archambault, Daniel and T{ó}th, Csaba D.}, keywords = {csuniwue myown}, note = {To appear.}, publisher = {Springer-Verlag}, series = {Lecture Notes in Computer Science}, title = {On Arrangements of Orthogonal Circles}, year = 2019 }
• Chaplick, S., van Dijk, T.C., Kryven, M., Park, J.-W., Ravsky, A., Wolff, A.: Bundled Crossings Revisited. In: Löffler, M. (hrsg.) Proc. 35th European Workshop on Computational Geometry (EuroCG'19). S. 57:1--7 (2019).
  [ BibTeX ]
   
  @inproceedings{cdkprw-bcr-EuroCG19, author = {Chaplick, Steven and van Dijk, Thomas C. and Kryven, Myroslav and Park, Ji-Won and Ravsky, Alexander and Wolff, Alexander}, booktitle = {Proc. 35th European Workshop on Computational Geometry (EuroCG'19)}, editor = {L{ö}ffler, Maarten}, keywords = {csuniwue myown}, pages = {57:1--7}, title = {Bundled Crossings Revisited}, year = 2019 }
• Wassermann, S., Casas, P., Seufert, M., Wamser, F.: On the Analysis of YouTube QoE in Cellular Networks through in-Smartphone Measurements. 12th IFIP Wireless and Mobile Networking Conference (WMNC). , Paris, France (2019).
  [ BibTeX ]
   
  @inproceedings{info3-inproceedings-2019-18, address = {Paris, France}, author = {Wassermann, Sarah and Casas, Pedro and Seufert, Michael and Wamser, Florian}, booktitle = {12th IFIP Wireless and Mobile Networking Conference (WMNC)}, keywords = {myown ua-net}, month = 9, title = {On the Analysis of YouTube QoE in Cellular Networks through in-Smartphone Measurements}, year = 2019 }
• Seufert, M.: Fundamental Advantages of Considering Quality of Experience Distributions over Mean Opinion Scores. , 11th International Conference on Quality of Multimedia Experience (QoMEX), Berlin, Germany (2019).
  [ BibTeX ]
   
  @presentation{info3-presentation-2019-4, address = {11th International Conference on Quality of Multimedia Experience (QoMEX), Berlin, Germany}, author = {Seufert, Michael}, keywords = {myown}, month = 6, title = {Fundamental Advantages of Considering Quality of Experience Distributions over Mean Opinion Scores}, year = 2019 }
• Simonovski, F.: Studying the Video Segmentation for different Streaming Platforms, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-bachelor-2019-16, author = {Simonovski, Filip}, keywords = {myown can}, month = 8, school = {University of Würzburg}, title = {Studying the Video Segmentation for different Streaming Platforms}, year = 2019 }
• Schaper, P., Grundgeiger, T.: Commission Errors with Forced Response Lag. Quarterly Journal of Experimental Psychology. 72, 2380-2392 (2019).
  [ BibTeX ] [ DOI ]
   
  @article{schaper2019commission, author = {Schaper, Philipp and Grundgeiger, Tobias}, journal = {Quarterly Journal of Experimental Psychology}, keywords = {myown schaper}, number = 10, pages = {2380-2392}, title = {Commission Errors with Forced Response Lag}, volume = 72, year = 2019 }
• Rosenberger, A.: Konstruktion eines RIOT-LoRaWAN-Sensorknotens, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-praktikum-2019-13, author = {Rosenberger, Andreas}, keywords = {myown}, month = 10, school = {Universitiy of Würzburg}, title = {Konstruktion eines RIOT-LoRaWAN-Sensorknotens}, year = 2019 }
• Stulier, N.: Statistische Evaluation der APM in DOTA 2, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-praktikum-2019-14, author = {Stulier, Norman}, keywords = {myown}, month = 10, school = {Universitiy of Würzburg}, title = {Statistische Evaluation der APM in DOTA 2}, year = 2019 }
• Hirth, M., Steurer, F., Borchert, K., Dubiner, D.: Task Scheduling on Crowdsourcing Platforms for Enabling Completion Time SLAs. 31st International Teletraffic Congress (ITC). , Budapest, Hungary (2019).
  [ BibTeX ]
   
  @inproceedings{info3-inproceedings-2019-20, address = {Budapest, Hungary}, author = {Hirth, Matthias and Steurer, Florian and Borchert, Kathrin and Dubiner, Dan}, booktitle = {31st International Teletraffic Congress (ITC)}, keywords = {myown ua-net}, month = 8, title = {Task Scheduling on Crowdsourcing Platforms for Enabling Completion Time SLAs}, year = 2019 }
• Roth, D., Stauffert, J.-P., Latoschik, M.E.: Avatar Embodiment, Behavior Replication, and Kinematics in Virtual Reality. In: Sherman, W.R. (hrsg.) VR Developer Gems. S. 321-348. Springer US (2019).
  [ BibTeX ]
   
  @inbook{roth2019avatar, author = {Roth, Daniel and Stauffert, Jan-Philipp and Latoschik, Marc Erich}, booktitle = {VR Developer Gems}, chapter = 17, editor = {Sherman, William R.}, keywords = {droth myown}, pages = {321-348}, publisher = {Springer US}, title = {Avatar Embodiment, Behavior Replication, and Kinematics in Virtual Reality}, volume = 1, year = 2019 }
• Roth, D., Bloch, C., Schmitt, J., Frischlich, L., Latoschik, M.E., Bente, G.: Perceived Authenticity, Empathy, and Pro-social Intentions Evoked Through Avatar-mediated Self-disclosures. Proceedings of Mensch Und Computer 2019. S. 21--30. ACM, New York, NY, USA (2019).
  [ BibTeX ] [ URL ] [ DOI ]
   
  @inproceedings{roth2019toappearperceived, address = {New York, NY, USA}, author = {Roth, Daniel and Bloch, Carola and Schmitt, Josephine and Frischlich, Lena and Latoschik, Marc Erich and Bente, Gary}, booktitle = {Proceedings of Mensch Und Computer 2019}, keywords = {droth myown}, pages = {21--30}, publisher = {ACM}, series = {MuC'19}, title = {Perceived Authenticity, Empathy, and Pro-social Intentions Evoked Through Avatar-mediated Self-disclosures}, year = 2019 }
• Biskup, F.: IoT-Datenanalyse im Smart City-Kontext, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-praktikum-2019-10, author = {Biskup, Fabian}, keywords = {myown}, month = 7, school = {Universitiy of Würzburg}, title = {IoT-Datenanalyse im Smart City-Kontext}, year = 2019 }
• Reynolds, R.M., Novotny, E., Lee, J., Roth, D., Bente, G.: Ambiguous Bodies: The Role of Displayed Arousal in Emotion [Mis]Perception. Journal of Nonverbal Behavior. (2019).
  [ BibTeX ] [ URL ] [ DOI ]
   
  @article{reynolds2019toappearambiguous, author = {Reynolds, Reed M. and Novotny, Eric and Lee, Joomi and Roth, Daniel and Bente, Gary}, journal = {Journal of Nonverbal Behavior}, keywords = {droth myown}, title = {Ambiguous Bodies: The Role of Displayed Arousal in Emotion [Mis]Perception}, year = 2019 }
• Moldovan, C., Wamser, F., Hoßfeld, T.: User Behavior and Engagement of a Mobile Video Streaming User from Crowdsourced Measurements. 2019 Eleventh International Conference on Quality of Multimedia Experience (QoMEX) (2019).
  [ Abstract ] [ BibTeX ]
   
  Mobile video streaming has gained a lot of popularity in recent year with the introduction of large data plans for mobile phones. While users in non-mobile scenarios have become accustomed to high quality and few stalling events, this is not the case in mobile environments. People are more likely to tolerate stalling since they know high throughput coverage cannot always be guaranteed. Their behavior and their engagement are drastically different when watching videos on mobile devices. In this paper, we characterize mobile phone users who use a video streaming application. We present a data set of over 6,000 video views from a crowdsourced video measurement study. We investigate user activity and engagement during video streaming and how such metrics are correlated with each other. This is the first study that goes beyond user engagement and investigates the direct behavior of mobile video users outside the lab which is an important step towards mobile QoE management.
  @inproceedings{info3-inproceedings-2019-21, abstract = {Mobile video streaming has gained a lot of popularity in recent year with the introduction of large data plans for mobile phones. While users in non-mobile scenarios have become accustomed to high quality and few stalling events, this is not the case in mobile environments. People are more likely to tolerate stalling since they know high throughput coverage cannot always be guaranteed. Their behavior and their engagement are drastically different when watching videos on mobile devices. In this paper, we characterize mobile phone users who use a video streaming application. We present a data set of over 6,000 video views from a crowdsourced video measurement study. We investigate user activity and engagement during video streaming and how such metrics are correlated with each other. This is the first study that goes beyond user engagement and investigates the direct behavior of mobile video users outside the lab which is an important step towards mobile QoE management.}, author = {Moldovan, Christian and Wamser, Florian and Hoßfeld, Tobias}, booktitle = {2019 Eleventh International Conference on Quality of Multimedia Experience (QoMEX)}, keywords = {myown dfg-sdn can}, month = 6, title = {User Behavior and Engagement of a Mobile Video Streaming User from Crowdsourced Measurements}, year = 2019 }
• Seufert, M.: Is QUIC becoming the New TCP? On the Potential Impact of a New Protocol on Networked Multimedia QoE. , 11th International Conference on Quality of Multimedia Experience (QoMEX), Berlin, Germany (2019).
  [ BibTeX ]
   
  @presentation{info3-presentation-2019-5, address = {11th International Conference on Quality of Multimedia Experience (QoMEX), Berlin, Germany}, author = {Seufert, Michael}, keywords = {myown}, month = 6, title = {Is QUIC becoming the New TCP? On the Potential Impact of a New Protocol on Networked Multimedia QoE}, year = 2019 }
• Wamser, F., Tran-Gia, P., Geißler, S., Hoßfeld, T.: Modeling of Traffic Flows in Internet of Things Using Renewal Approximation. International Conference on Optimization and Decision Science (ODS2019) (2019).
  [ Abstract ] [ BibTeX ]
   
  This paper proposes a versatile approach to model aggregated traffic flows in the Internet of Things (IoT) using renewal approximation. The modeled traffic originates from a large number of sources or devices consisting of a set of sensors mixed with classical elastic random traffic modeled as Poisson arrival process. The work shows the exact derivation in the simple case for periodic sensors. It shows further results in the mixed case with periodic sensors and a background process. The renewal approximation allows to derive the required number of sensors such that the aggregated traffic can be approximated as Poisson process.
  @inproceedings{info3-article-2019-8, abstract = {This paper proposes a versatile approach to model aggregated traffic flows in the Internet of Things (IoT) using renewal approximation. The modeled traffic originates from a large number of sources or devices consisting of a set of sensors mixed with classical elastic random traffic modeled as Poisson arrival process. The work shows the exact derivation in the simple case for periodic sensors. It shows further results in the mixed case with periodic sensors and a background process. The renewal approximation allows to derive the required number of sensors such that the aggregated traffic can be approximated as Poisson process.}, author = {Wamser, Florian and Tran-Gia, Phuoc and Geißler, Stefan and Hoßfeld, Tobias}, booktitle = {International Conference on Optimization and Decision Science (ODS2019)}, keywords = {myown 5cale iot can net-man}, month = 9, title = {Modeling of Traffic Flows in Internet of Things Using Renewal Approximation}, year = 2019 }
• Moldovan, C.: User Behavior and Engagement of a Mobile Video Streaming User from Crowdsourced Measurements, (2019).
  [ BibTeX ]
   
  @misc{info3-poster-2019-1, address = {Berlin, Germany}, author = {Moldovan, Christian}, booktitle = {2019 Eleventh International Conference on Quality of Multimedia Experience (QoMEX)}, keywords = {myown}, month = 6, title = {User Behavior and Engagement of a Mobile Video Streaming User from Crowdsourced Measurements}, year = 2019 }
• Moldovan, C.: Contributions to TF "Managing Web & Cloud QoE". , 13th Qualinet General Meeting, Berlin, Germany (2019).
  [ BibTeX ]
   
  @presentation{info3-presentation-2019-6, address = {13th Qualinet General Meeting, Berlin, Germany}, author = {Moldovan, Christian}, keywords = {myown}, month = 6, title = {Contributions to TF "Managing Web & Cloud QoE"}, year = 2019 }
• Janiak, L.: Interpolation von (offenen) Geodaten in R, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-praktikum-2019-11, author = {Janiak, Lea}, keywords = {myown}, month = 8, school = {Universitiy of Würzburg}, title = {Interpolation von (offenen) Geodaten in R}, year = 2019 }
• Geißler, S., Prantl, T., Lange, S., Wamser, F., Hoßfeld, T.: Discrete-Time Analysis of the Blockchain Distributed Ledger Technology. 31st International Teletraffic Congress (ITC). , Budapest, Hungary (2019).
  [ Abstract ] [ BibTeX ]
   
  Blockchain and distributed ledger technologies have become more and more popular and widespread during recent years. After the initial hype about the technology and many cryptocurrency related use cases, the technology slowly starts to make its way into other domains like food tracking and document management. In order to further contribute to the search of what this technology can be used for, more detailed performance evaluations are required in order to investigate key performance indicators and general limits of the technology. To this end, we develop a discrete-time queueing model that allows a detailed evaluation of the characteristics of a blockchain system, such as the transaction waiting time distribution. Furthermore, we validate the model by comparing the results to values obtained from measurements in a closed lab environment based on the Ethereum blockchain.
  @inproceedings{info3-inproceedings-2019-19, abstract = {Blockchain and distributed ledger technologies have become more and more popular and widespread during recent years. After the initial hype about the technology and many cryptocurrency related use cases, the technology slowly starts to make its way into other domains like food tracking and document management. In order to further contribute to the search of what this technology can be used for, more detailed performance evaluations are required in order to investigate key performance indicators and general limits of the technology. To this end, we develop a discrete-time queueing model that allows a detailed evaluation of the characteristics of a blockchain system, such as the transaction waiting time distribution. Furthermore, we validate the model by comparing the results to values obtained from measurements in a closed lab environment based on the Ethereum blockchain.}, author = {Geißler, Stefan and Prantl, Thomas and Lange, Stanislav and Wamser, Florian and Hoßfeld, Tobias}, booktitle = {31st International Teletraffic Congress (ITC). , Budapest, Hungary}, keywords = {myown blockchain net-man ngn}, month = 8, title = {Discrete-Time Analysis of the Blockchain Distributed Ledger Technology}, year = 2019 }
• Raffeck, S.: Energiemessungen für LoRaWAN/IoT-Geräte, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-praktikum-2019-9, author = {Raffeck, Simon}, keywords = {myown}, month = 8, school = {Universitiy of Würzburg}, title = {Energiemessungen für LoRaWAN/IoT-Geräte}, year = 2019 }
• Wassermann, S., Seufert, M., Casas, P., Li, G., Kuang, L.: Let me Decrypt your Beauty: Real-time Prediction of Video Resolution and Bitrate for Encrypted Video Streaming, (2019).
  [ BibTeX ]
   
  @misc{info3-software-2019-1, address = {Paris, France}, author = {Wassermann, Sarah and Seufert, Michael and Casas, Pedro and Li, Gang and Kuang, Li}, booktitle = {Network Traffic Measurement and Analysis Conference (TMA)}, keywords = {myown net-man}, month = 6, title = {Let me Decrypt your Beauty: Real-time Prediction of Video Resolution and Bitrate for Encrypted Video Streaming}, year = 2019 }
• Ring, M., Schlör, D., Landes, D., Hotho, A.: Flow-based network traffic generation using Generative Adversarial Networks. Computers & Security. 82, 156 - 172 (2019).
  [ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
   
  Flow-based data sets are necessary for evaluating network-based intrusion detection systems (NIDS). In this work, we propose a novel methodology for generating realistic flow-based network traffic. Our approach is based on Generative Adversarial Networks (GANs) which achieve good results for image generation. A major challenge lies in the fact that GANs can only process continuous attributes. However, flow-based data inevitably contain categorical attributes such as IP addresses or port numbers. Therefore, we propose three different preprocessing approaches for flow-based data in order to transform them into continuous values. Further, we present a new method for evaluating the generated flow-based network traffic which uses domain knowledge to define quality tests. We use the three approaches for generating flow-based network traffic based on the CIDDS-001 data set. Experiments indicate that two of the three approaches are able to generate high quality data.
  @article{RING2019156, abstract = {Flow-based data sets are necessary for evaluating network-based intrusion detection systems (NIDS). In this work, we propose a novel methodology for generating realistic flow-based network traffic. Our approach is based on Generative Adversarial Networks (GANs) which achieve good results for image generation. A major challenge lies in the fact that GANs can only process continuous attributes. However, flow-based data inevitably contain categorical attributes such as IP addresses or port numbers. Therefore, we propose three different preprocessing approaches for flow-based data in order to transform them into continuous values. Further, we present a new method for evaluating the generated flow-based network traffic which uses domain knowledge to define quality tests. We use the three approaches for generating flow-based network traffic based on the CIDDS-001 data set. Experiments indicate that two of the three approaches are able to generate high quality data.}, author = {Ring, Markus and Schlör, Daniel and Landes, Dieter and Hotho, Andreas}, journal = {Computers & Security}, keywords = {2019 GAN flow generation myown network security traffic}, pages = {156 - 172}, title = {Flow-based network traffic generation using Generative Adversarial Networks}, volume = 82, year = 2019 }
• Leidinger, F.: Studing the Initial Delay of the YouTube Mobile App with TensorFlow, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-bachelor-2019-17, author = {Leidinger, Ferdinand}, keywords = {myown can}, month = 8, school = {University of Würzburg}, title = {Studing the Initial Delay of the YouTube Mobile App with TensorFlow}, year = 2019 }
• Loh, F., Vomhoff, V., Wamser, F., Metzger, F., Hoßfeld, T.: Traffic Measurement Study on Video Streaming with the Amazon Echo Show. 4th Internet-QoE Workshop: QoE-based Analysis and Management of Data Communication Networks (2019).
  [ Abstract ] [ BibTeX ]
   
  The Amazon Echo Show is one of the most widely used smart speakers with the ability to stream video. Due to its popularity, the traffc profiles of such devices are of interest to network operators and providers. This work presents a measurement study of the Amazon Echo Show in terms of network traffc and streaming behavior. More than 470 hours of streaming data are collected and analyzed at network layer. Based on this, streaming quality is derived at application layer. The study quantifies the traffc and shows that streaming with the Amazon Echo Show is comparable to streaming with a native web browser, but in a more conservative way.
  @inproceedings{info3-inproceedings-2019-26, abstract = {The Amazon Echo Show is one of the most widely used smart speakers with the ability to stream video. Due to its popularity, the traffc profiles of such devices are of interest to network operators and providers. This work presents a measurement study of the Amazon Echo Show in terms of network traffc and streaming behavior. More than 470 hours of streaming data are collected and analyzed at network layer. Based on this, streaming quality is derived at application layer. The study quantifies the traffc and shows that streaming with the Amazon Echo Show is comparable to streaming with a native web browser, but in a more conservative way.}, author = {Loh, Frank and Vomhoff, Viktoria and Wamser, Florian and Metzger, Florian and Hoßfeld, Tobias}, booktitle = {4th Internet-QoE Workshop: QoE-based Analysis and Management of Data Communication Networks}, keywords = {myown huawei can}, month = 10, title = {Traffic Measurement Study on Video Streaming with the Amazon Echo Show}, year = 2019 }
• Kern, F., Winter, C., Gall, D., Käthner, I., Pauli, P., Latoschik, M.E.: Immersive Virtual Reality and Gamification Within Procedurally Generated Environments to Increase Motivation During Gait Rehabilitation. 2019 IEEE Conference on Virtual Reality and 3D User Interfaces (VR) (2019).
  [ Abstract ] [ BibTeX ] [ URL ]
   
  Virtual Reality (VR) technology offers promising opportunities to improve traditional treadmill-based rehabilitation programs. We present an immersive VR rehabilitation system that includes a head-mounted display and motion sensors. The application is designed to promote the experience of relatedness, autonomy, and competence. The application uses procedural content generation to generate diverse landscapes. We evaluated the effect of the immersive rehabilitation system on motivation and affect. We conducted a repeated measures study with 36 healthy participants to compare the immersive program to a traditional rehabilitation program. Participants reported significant greater enjoyment, felt more competent and experienced higher decision freedom and meaningfulness in the immersive VR gait training compared to the traditional training. They experienced significantly lower physical demand, simulator sickness, and state anxiety, and felt less pressured while still perceiving a higher personal performance. We derive three design implications for future applications in gait rehabilitation: Immersive VR provides a promising augmentation for gait rehabilitation. Gamification features provide a design guideline for content creation in gait rehabilitation. Relatedness and autonomy provide critical content features in gait rehabilitation.
  @inproceedings{kern2019immersive, abstract = {Virtual Reality (VR) technology offers promising opportunities to improve traditional treadmill-based rehabilitation programs. We present an immersive VR rehabilitation system that includes a head-mounted display and motion sensors. The application is designed to promote the experience of relatedness, autonomy, and competence. The application uses procedural content generation to generate diverse landscapes. We evaluated the effect of the immersive rehabilitation system on motivation and affect. We conducted a repeated measures study with 36 healthy participants to compare the immersive program to a traditional rehabilitation program. Participants reported significant greater enjoyment, felt more competent and experienced higher decision freedom and meaningfulness in the immersive VR gait training compared to the traditional training. They experienced significantly lower physical demand, simulator sickness, and state anxiety, and felt less pressured while still perceiving a higher personal performance. We derive three design implications for future applications in gait rehabilitation: Immersive VR provides a promising augmentation for gait rehabilitation. Gamification features provide a design guideline for content creation in gait rehabilitation. Relatedness and autonomy provide critical content features in gait rehabilitation.}, author = {Kern, Florian and Winter, Carla and Gall, Dominik and Käthner, Ivo and Pauli, Paul and Latoschik, Marc Erich}, booktitle = {2019 IEEE Conference on Virtual Reality and 3D User Interfaces (VR)}, keywords = {homecoming ieee2019 myown}, note = {to be published}, title = {Immersive Virtual Reality and Gamification Within Procedurally Generated Environments to Increase Motivation During Gait Rehabilitation}, year = 2019 }
• Supervisor: Moldovan, C.: Analyze des Verhaltens und der Zuschauerbindung von Twitch Nutzern, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-praktikum-2019-2, author = {Supervisor: Moldovan, Christian}, keywords = {myown}, school = {University of Würzburg}, title = {Analyze des Verhaltens und der Zuschauerbindung von Twitch Nutzern}, year = 2019 }
• Supervisor: Schwind, A.: Crowdsourced Network Measurements: Evaluation and Applicability for 5G, (2019).
  [ Abstract ] [ BibTeX ]
   
  Contact: anika.schwind@informatik.uni-wuerzburg.de
  @mastersthesis{info3-bachelor-2019-15, abstract = {Contact: anika.schwind@informatik.uni-wuerzburg.de}, author = {Supervisor: Schwind, Anika}, keywords = {myown}, school = {University of Würzburg}, title = {Crowdsourced Network Measurements: Evaluation and Applicability for 5G}, year = 2019 }
• Gray, N., Grigorjew, A., Hoßfeld, T., Shukla, A., Zinner, T.: Gray, Nicholas, et al. "Highlighting the Gap Between Expected and Actual Behavior in P4-enabled Networks, (2019).
  [ Abstract ] [ BibTeX ]
   
  Modern networks increasingly rely on Software-defined Networking (SDN) and Network Function Virtualization (NFV) to augment their flexibility in high load scenarios. To further enhance the performance, a part of the functionality is often offloaded to forwarding devices, which are used as hardware accelerators and are configured by high level programming languages such as P4. However, hardware vendors use sophisticated technologies to implement these standards, which need to be understood by the programmer to avoid unintended behavior. In this demonstration we highlight the severe consequences of only relying on the network programming language when ignoring the device-specific limitations. We show this by the example of a Denial of Service attack against a P4-enabled SmartNIC. Finally, we discuss possible mitigations to this attack and stress the importance of an overall understanding of the entire system.
  @misc{info3-demo-2019-1, abstract = {Modern networks increasingly rely on Software-defined Networking (SDN) and Network Function Virtualization (NFV) to augment their flexibility in high load scenarios. To further enhance the performance, a part of the functionality is often offloaded to forwarding devices, which are used as hardware accelerators and are configured by high level programming languages such as P4. However, hardware vendors use sophisticated technologies to implement these standards, which need to be understood by the programmer to avoid unintended behavior. In this demonstration we highlight the severe consequences of only relying on the network programming language when ignoring the device-specific limitations. We show this by the example of a Denial of Service attack against a P4-enabled SmartNIC. Finally, we discuss possible mitigations to this attack and stress the importance of an overall understanding of the entire system.}, author = {Gray, Nicholas and Grigorjew, Alexej and Hoßfeld, Tobias and Shukla, Apoorv and Zinner, Thomas}, booktitle = {IFIP/IEEE Symposium on Integrated Network and Service Management (IM)}, keywords = {myown sardine ngn}, month = 3, title = {Gray, Nicholas, et al. "Highlighting the Gap Between Expected and Actual Behavior in P4-enabled Networks}, year = 2019 }
• Morell, M.: Traffic Measurement Study for Real-Time Video Streaming with a Remote Controllable Drone, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-master-2019-7, author = {Morell, Michael}, keywords = {myown}, school = {University of Würzburg}, title = {Traffic Measurement Study for Real-Time Video Streaming with a Remote Controllable Drone}, year = 2019 }
• Ewald, M.: Observing Changes in Machine Learning Behavior from Input Latency in Games, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-bachelor-2019-9, author = {Ewald, Marvin}, keywords = {myown}, month = 8, school = {Universität Würzburg}, title = {Observing Changes in Machine Learning Behavior from Input Latency in Games}, year = 2019 }
• Supervisor: Grigorjew, A.: Consolidation of Resources and Demands in VNF Chain Placement Problems (BA), (2019).
  [ Abstract ] [ BibTeX ]
   
  Contact: Alexej Grigorjew <alexej.grigorjew@informatik.uni-wuerzburg.de> Placing Virtual Network Functions in network graphs is an NP-hard problem. Solving large problem instances is often unfeasible due to limited computational resources and time. For many use cases, the problem input is not required in all detail, but can be aggregated into a smaller abstraction. In this work, an algorithm should be implemented that generates such smaller representations of graphs and VNF demands. Further, its performance shall be evaluated by applying (existing) solvers on the results and comparing both runtime and quality of their placements with the original graph.
  @mastersthesis{info3-bachelor-2017-30, abstract = {Contact: Alexej Grigorjew <alexej.grigorjew@informatik.uni-wuerzburg.de> Placing Virtual Network Functions in network graphs is an NP-hard problem. Solving large problem instances is often unfeasible due to limited computational resources and time. For many use cases, the problem input is not required in all detail, but can be aggregated into a smaller abstraction. In this work, an algorithm should be implemented that generates such smaller representations of graphs and VNF demands. Further, its performance shall be evaluated by applying (existing) solvers on the results and comparing both runtime and quality of their placements with the original graph.}, author = {Supervisor: Grigorjew, Alexej}, keywords = {myown ngn}, school = {University of Würzburg}, title = {Consolidation of Resources and Demands in VNF Chain Placement Problems (BA)}, year = 2019 }
• Hamzeheinejad, N., Roth, D., Götz, D., Weilbach, F., Latoschik, M.E.: Physiological Effectivity and User Experience of Immersive Gait Rehabilitation. The First IEEE VR Workshop on Applied VR for Enhanced Healthcare (AVEH). IEEE (2019).
  [ Abstract ] [ BibTeX ] [ URL ]
   
  Gait impairments from neurological injuries require repeated and exhaustive physical exercises for rehabilitation. Prolonged physical training in clinical environments can easily become frustrating and de-motivating for various reasons which in turn risks to decrease efficiency during the healing process. This paper introduces an immersive VR system for gait rehabilitation which targets user experience and increase of motivation while evoking comparable physiological responses needed for successful training effects. The system provides a virtual environment consisting of open fields, forest, mountains, waterfalls, animals, and a beach for inspiring strolls and is able to include a virtual trainer as a companion during the walks. We evaluated the ecological validity of the system with healthy subjects before performing the clinical trial. We assessed the systemu0027s target qualities with a longitudinal study with 45 healthy participants in three consecutive days in comparison to a baseline non-VR condition. The system was able to evoke similar physiological responses. The workload was increased for the VR condition but the system also elicited a higher enjoyment and motivation which was the main goal. The latter benefits slightly decreased over time (as did workload) while they were still higher than in the non-VR condition. The virtual trainer did not show to be beneficial, the corresponding implications are discussed. Overall, the approach shows promising results which renders the system a viable alternative for the given use case while it motivates interesting direction for future work.
  @inproceedings{hamzeheinejad2019physiological, abstract = {Gait impairments from neurological injuries require repeated and exhaustive physical exercises for rehabilitation. Prolonged physical training in clinical environments can easily become frustrating and de-motivating for various reasons which in turn risks to decrease efficiency during the healing process. This paper introduces an immersive VR system for gait rehabilitation which targets user experience and increase of motivation while evoking comparable physiological responses needed for successful training effects. The system provides a virtual environment consisting of open fields, forest, mountains, waterfalls, animals, and a beach for inspiring strolls and is able to include a virtual trainer as a companion during the walks. We evaluated the ecological validity of the system with healthy subjects before performing the clinical trial. We assessed the system\u0027s target qualities with a longitudinal study with 45 healthy participants in three consecutive days in comparison to a baseline non-VR condition. The system was able to evoke similar physiological responses. The workload was increased for the VR condition but the system also elicited a higher enjoyment and motivation which was the main goal. The latter benefits slightly decreased over time (as did workload) while they were still higher than in the non-VR condition. The virtual trainer did not show to be beneficial, the corresponding implications are discussed. Overall, the approach shows promising results which renders the system a viable alternative for the given use case while it motivates interesting direction for future work.}, author = {Hamzeheinejad, Negin and Roth, Daniel and Götz, Daniel and Weilbach, Franz and Latoschik, Marc Erich}, booktitle = {The First IEEE VR Workshop on Applied VR for Enhanced Healthcare (AVEH)}, keywords = {myown vrgait}, publisher = {IEEE}, title = {Physiological Effectivity and User Experience of Immersive Gait Rehabilitation}, year = 2019 }
• Skwarek, V., Reher, J., Geißler, S., Zinner, T.: Automation und Digitalisierung - Potenzial und Einsatz von Blockchain- und Distributed-Ledger-Technologien in der Automatisierungstechnik, (2019).
  [ BibTeX ]
   
  @misc{info3-misc-2019-1, author = {Skwarek, Volker and Reher, Julian and Geißler, Stefan and Zinner, Thomas}, howpublished = {Zentralverband Elektrotechnik- und Elektroindustrie}, keywords = {myown blockchain net-man ngn}, month = 2, title = {Automation und Digitalisierung - Potenzial und Einsatz von Blockchain- und Distributed-Ledger-Technologien in der Automatisierungstechnik}, year = 2019 }
• Metter, C.: Resilience, Availability, and Serviceability Evaluation in Software-defined Networks, (2019).
  [ BibTeX ]
   
  @phdthesis{info3-dissertation-2019-1, author = {Metter, Christopher}, keywords = {myown}, month = 1, school = {Universitiy of Würzburg}, title = {Resilience, Availability, and Serviceability Evaluation in Software-defined Networks}, year = 2019 }
• Schmitt, J., Lugrin, J.-L., Carolin, and W., Latoschik, M.E.: Investigating Gesture-based Commands for First-Person Shooter Games in Virtual Reality. Proceedings of User-embodied Interaction in Virtual Reality, Mensch und Computer 2019 (2019).
  [ BibTeX ] [ URL ]
   
  @inproceedings{LugrinGesture2019, author = {Schmitt, Johann and Lugrin, Jean-Luc and and Wienrich Carolin and Latoschik, Marc Erich}, booktitle = {Proceedings of User-embodied Interaction in Virtual Reality, Mensch und Computer 2019}, keywords = {myown}, title = {Investigating Gesture-based Commands for First-Person Shooter Games in Virtual Reality}, year = 2019 }
• Oberdörfer, S., Latoschik, M.E.: Knowledge Encoding in Game Mechanics: Transfer-Oriented Knowledge Learning in Desktop-3D and VR. International Journal of Computer Games Technology. 2019, (2019).
  [ BibTeX ] [ URL ] [ DOI ]
   
  @article{oberdorfer2019knowledge, author = {Oberdörfer, Sebastian and Latoschik, Marc Erich}, journal = {International Journal of Computer Games Technology}, keywords = {getit myown oberdoerfer}, title = {Knowledge Encoding in Game Mechanics: Transfer-Oriented Knowledge Learning in Desktop-3D and VR}, volume = 2019, year = 2019 }
• Supervisor: Moldovan, C.: Implementation of an Adaptation Algorithm for 360-Degree Videos, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-praktikum-2019-1, author = {Supervisor: Moldovan, Christian}, keywords = {myown}, school = {University of Würzburg}, title = {Implementation of an Adaptation Algorithm for 360-Degree Videos}, year = 2019 }
• Supervisor: Moldovan, C.: Applied Optimization of Virtual Reality Videos, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-bachelor-2019-4, author = {Supervisor: Moldovan, Christian}, keywords = {myown}, school = {University of Würzburg}, title = {Applied Optimization of Virtual Reality Videos}, year = 2019 }
• Loh, F.: Machine Learning Approach to Classify Video Stalls at Network Layer, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-master-2019-1, author = {Loh, Frank}, keywords = {myown huawei can}, school = {University of Würzburg}, title = {Machine Learning Approach to Classify Video Stalls at Network Layer}, year = 2019 }
• Lugrin, J.-L., Latoschik, M.E., Glémarec, Y., Bosser, A.-G., Chollet, M., Lugrin, B.: Towards Narrative-Driven Atmosphere for Virtual Classroom. Proceedings of the 38th ACM CHI conference (Late Breaking Work Track) (2019).
  [ BibTeX ] [ URL ]
   
  @inproceedings{lugrin2019towards, author = {Lugrin, Jean-Luc and Latoschik, Marc Erich and Glémarec, Yann and Bosser, Anne-Gween and Chollet, Mathieu and Lugrin, Birgit}, booktitle = {Proceedings of the 38th ACM CHI conference (Late Breaking Work Track)}, keywords = {birgit chi2019 mi myown}, title = {Towards Narrative-Driven Atmosphere for Virtual Classroom}, year = 2019 }
• Lugrin, J.-L., Landeck, M., Latoschik, M.E.: Simulated Reference Frame Effects on Steering, Jumping and Sliding. Proceedings of the 26th IEEE Virtual Reality (VR) conference (2019).
  [ BibTeX ] [ URL ]
   
  @inproceedings{lugrin2019simulated, author = {Lugrin, Jean-Luc and Landeck, Maximilian and Latoschik, Marc Erich}, booktitle = {Proceedings of the 26th IEEE Virtual Reality (VR) conference}, keywords = {ieee2019 myown}, title = {Simulated Reference Frame Effects on Steering, Jumping and Sliding}, year = 2019 }
• Hertweck, S., Weber, D., Alwanni, H., Unruh, F., Fischbach, M., Latoschik, M.E., Ball, T.: Brain Activity in Virtual Reality: Assessing Signal Quality of High-Resolution EEG While Using Head-Mounted Displays. Proceedings of the 26th IEEE Conference on Virtual Reality and 3D User Interfaces (VR). S. 970-971. IEEE (2019).
  [ Abstract ] [ BibTeX ] [ URL ]
   
  Biometric measures such as the electroencephalogram (EEG) promise to become viable alternatives to subjective questionnaire ratings for the evaluation of psychophysical effects associated with Virtual Reality (VR) systems, as they provide objective and continuous measurements without breaking the exposure. The extent to which the EEG signal can be disturbed by the presence of VR sys- tems, however, has been barely investigated. This study outlines how to evaluate the compatibility of a given EEG-VR setup on the example of two commercial head-mounted displays (HMDs), the Oculus Rift and the HTC Vive Pro. We use a novel experimental protocol to compare the spectral composition between conditions with and without an HMD present during an eyes-open vs. eyes-closed task. We found general artifacts at the line hum of 50 Hz, and additional HMD refresh rate artifacts (90 Hz) for the Oculus rift exclusively. Frequency components typically most interesting to non-invasive EEG research and applications (<50 Hz), however, remained largely unaffected. We observed similar topographies of visually-induced modulation of alpha band power for both HMD conditions in all subjects. Hence, the study introduces a necessary validation test for HMDs in combination with EEG and further promotes EEG as a potential biometric measurement method for psychophysical effects in VR systems.
  @inproceedings{hertweck2019brain, abstract = {Biometric measures such as the electroencephalogram (EEG) promise to become viable alternatives to subjective questionnaire ratings for the evaluation of psychophysical effects associated with Virtual Reality (VR) systems, as they provide objective and continuous measurements without breaking the exposure. The extent to which the EEG signal can be disturbed by the presence of VR sys- tems, however, has been barely investigated. This study outlines how to evaluate the compatibility of a given EEG-VR setup on the example of two commercial head-mounted displays (HMDs), the Oculus Rift and the HTC Vive Pro. We use a novel experimental protocol to compare the spectral composition between conditions with and without an HMD present during an eyes-open vs. eyes-closed task. We found general artifacts at the line hum of 50 Hz, and additional HMD refresh rate artifacts (90 Hz) for the Oculus rift exclusively. Frequency components typically most interesting to non-invasive EEG research and applications (<50 Hz), however, remained largely unaffected. We observed similar topographies of visually-induced modulation of alpha band power for both HMD conditions in all subjects. Hence, the study introduces a necessary validation test for HMDs in combination with EEG and further promotes EEG as a potential biometric measurement method for psychophysical effects in VR systems.}, author = {Hertweck, Stephan and Weber, Desirée and Alwanni, Hisham and Unruh, Fabian and Fischbach, Martin and Latoschik, Marc Erich and Ball, Tonio}, booktitle = {Proceedings of the 26th IEEE Conference on Virtual Reality and 3D User Interfaces (VR)}, keywords = {interactive-opera myown}, pages = {970-971}, publisher = {IEEE}, title = {Brain Activity in Virtual Reality: Assessing Signal Quality of High-Resolution EEG While Using Head-Mounted Displays}, year = 2019 }
• Winter, C., Kern, F., Käthner, I., Gall, D., Latoschik, M.E., Pauli, P.: Virtuelle Realität als Ergänzung des Laufbandtrainings zur Rehabilitation von Gangstörungen bei Patienten mit Schlaganfall und Multipler Sklerose. (2019).
  [ Abstract ] [ BibTeX ]
   
  Die Technik der virtuellen Realität (VR) bietet neue Behandlungsmöglichkeiten in der Rehabilitation neurologischer Erkrankungen. Vorherige Studien haben gezeigt, dass ein VR-basiertes Laufbandtraining bei Patienten mit Gangstörungen nicht nur den physischen, sondern auch den psychischen Therapieerfolg steigert und damit eine sinnvolle Ergänzung zum herkömmlichen Gangtraining darstellt. In der vorliegenden Studie wurde untersucht, welche Auswirkungen die immersive Darbietung einer virtuellen Umgebung (über ein Head-Mounted-Display, HMD) gegenüber der semi-immersiven Darbietung der VR (über einen Flachbildmonitor) und dem herkömmlichen Laufbandtraining ohne VR hat. Dazu durchliefen zunächst 36 gesunde Probanden und anschließend 14 MS- bzw. Schlaganfallpatienten mit Gangstörungen jeweils die drei verschiedenen Laufbandbedingungen (immersiv, semi-immersiv und ohne VR). Die eingesetzte virtuelle Umgebung enthielt Gamification-Elemente zur Motivationssteigerung und wurde auf Grundlage der Selbstbestimmungstheorie nach Ryan und Deci implementiert. Die Studie mit gesunden Probanden diente dazu, die Gebrauchstauglichkeit (Usability) zu prüfen und technische Defizite aufzudecken. In einer Proof-of-Concept-Studie mit 14 MS- und Schlaganfallpatienten wurde anschließend anhand der Anwendung getestet, ob Patienten mit einem VR-gestützten Laufbandtraining im Rahmen der Behandlung ihrer Gangstörungen (EDSS < 6) ihre Lauffähigkeiten verbessern können. Primäres Outcome Maß war in beiden Studien die durchschnittliche Laufgeschwindigkeit innerhalb der einzelnen Bedingungen. Mittels standardisierter Fragebögen wurden zusätzlich Motivation, Benutzerfreundlichkeit, Präsenzerleben (Igroup Presence Questionnaire) und Nebenwirkungen des VR-Systems (Simulator Sickness Questionnaire) untersucht. Außerdem wurde die Präferenz der Studienteilnehmer in Bezug auf die drei Bedingungen erfragt. Sowohl in der Studie mit gesunden Teilnehmern als auch in der Patientenstudie zeigte sich bei der HMD-Bedingung eine signifikant höhere durchschnittliche Laufgeschwindigkeit als beim Laufbandtraining ohne VR. Das Präsenzerleben war in beiden Studien in der HMD-Bedingung signifikant höher als in der Monitor-Bedingung. Darüber hinaus sind keine Nebenwirkungen durch die virtuelle Welt im Sinne einer Simulator Sickness aufgetreten. Die Studienteilnehmer hatten keine relevanten VR-bedingten Haltungsschwierigkeiten oder Probleme in Bezug auf das visuelle Display. Während die Motivation bei den gesunden Probanden nach dem HMD-Durchgang im Vergleich zu den anderen beiden Bedingungen höher ausfiel, wurden in der Patientenstudie keine signifikanten Unterschiede detektiert. Dennoch gaben die Patienten an, die virtuelle Welt in der HMD-Bedingung als motivierender empfunden zu haben als in der Monitor-Bedingung. Unter allen drei Bedingungen wurde das HMD-Laufbandtraining von 71 % (n = 14) der Patienten und 89 % (n = 36) der gesunden Versuchsteilnehmer präferiert. Ebenfalls 71 % der Patienten könnten sich vorstellen, das HMD-Laufbandtraining in Zukunft häufiger zu nutzen.
  @presentation{winter2019virtuelle, abstract = {Die Technik der virtuellen Realität (VR) bietet neue Behandlungsmöglichkeiten in der Rehabilitation neurologischer Erkrankungen. Vorherige Studien haben gezeigt, dass ein VR-basiertes Laufbandtraining bei Patienten mit Gangstörungen nicht nur den physischen, sondern auch den psychischen Therapieerfolg steigert und damit eine sinnvolle Ergänzung zum herkömmlichen Gangtraining darstellt. In der vorliegenden Studie wurde untersucht, welche Auswirkungen die immersive Darbietung einer virtuellen Umgebung (über ein Head-Mounted-Display, HMD) gegenüber der semi-immersiven Darbietung der VR (über einen Flachbildmonitor) und dem herkömmlichen Laufbandtraining ohne VR hat. Dazu durchliefen zunächst 36 gesunde Probanden und anschließend 14 MS- bzw. Schlaganfallpatienten mit Gangstörungen jeweils die drei verschiedenen Laufbandbedingungen (immersiv, semi-immersiv und ohne VR). Die eingesetzte virtuelle Umgebung enthielt Gamification-Elemente zur Motivationssteigerung und wurde auf Grundlage der Selbstbestimmungstheorie nach Ryan und Deci implementiert. Die Studie mit gesunden Probanden diente dazu, die Gebrauchstauglichkeit (Usability) zu prüfen und technische Defizite aufzudecken. In einer Proof-of-Concept-Studie mit 14 MS- und Schlaganfallpatienten wurde anschließend anhand der Anwendung getestet, ob Patienten mit einem VR-gestützten Laufbandtraining im Rahmen der Behandlung ihrer Gangstörungen (EDSS < 6) ihre Lauffähigkeiten verbessern können. Primäres Outcome Maß war in beiden Studien die durchschnittliche Laufgeschwindigkeit innerhalb der einzelnen Bedingungen. Mittels standardisierter Fragebögen wurden zusätzlich Motivation, Benutzerfreundlichkeit, Präsenzerleben (Igroup Presence Questionnaire) und Nebenwirkungen des VR-Systems (Simulator Sickness Questionnaire) untersucht. Außerdem wurde die Präferenz der Studienteilnehmer in Bezug auf die drei Bedingungen erfragt. Sowohl in der Studie mit gesunden Teilnehmern als auch in der Patientenstudie zeigte sich bei der HMD-Bedingung eine signifikant höhere durchschnittliche Laufgeschwindigkeit als beim Laufbandtraining ohne VR. Das Präsenzerleben war in beiden Studien in der HMD-Bedingung signifikant höher als in der Monitor-Bedingung. Darüber hinaus sind keine Nebenwirkungen durch die virtuelle Welt im Sinne einer Simulator Sickness aufgetreten. Die Studienteilnehmer hatten keine relevanten VR-bedingten Haltungsschwierigkeiten oder Probleme in Bezug auf das visuelle Display. Während die Motivation bei den gesunden Probanden nach dem HMD-Durchgang im Vergleich zu den anderen beiden Bedingungen höher ausfiel, wurden in der Patientenstudie keine signifikanten Unterschiede detektiert. Dennoch gaben die Patienten an, die virtuelle Welt in der HMD-Bedingung als motivierender empfunden zu haben als in der Monitor-Bedingung. Unter allen drei Bedingungen wurde das HMD-Laufbandtraining von 71 % (n = 14) der Patienten und 89 % (n = 36) der gesunden Versuchsteilnehmer präferiert. Ebenfalls 71 % der Patienten könnten sich vorstellen, das HMD-Laufbandtraining in Zukunft häufiger zu nutzen.}, author = {Winter, Carla and Kern, Florian and Käthner, Ivo and Gall, Dominik and Latoschik, Marc Erich and Pauli, Paul}, keywords = {myown}, title = {Virtuelle Realität als Ergänzung des Laufbandtrainings zur Rehabilitation von Gangstörungen bei Patienten mit Schlaganfall und Multipler Sklerose}, year = 2019 }
• Lugrin, J.-L., Kern, F., Kleinbeck, C., Roth, D., Daxery, C., Feiglz, T., Mutschlery, C., Latoschik, M.E.: A Framework for Location-Based VR Applications. Proceedings of the GI VR/AR - Workshop (2019).
  [ BibTeX ] [ URL ]
   
  @inproceedings{LugrinHolopark2019, author = {Lugrin, Jean-Luc and Kern, Florian and Kleinbeck, Constantin and Roth, Daniel and Daxery, Christian and Feiglz, Tobias and Mutschlery, Christopher and Latoschik, Marc Erich}, booktitle = {Proceedings of the GI VR/AR - Workshop}, keywords = {myown}, title = {A Framework for Location-Based VR Applications}, year = 2019 }
• Loh, F., Wamser, F., Moldovan, C., Zeidler, B., Hoßfeld, T., Tsilimantos, D., Valentin, S.: From click to playback: a dataset to study the response time of mobile YouTube. Proceedings of the 10th ACM Multimedia Systems Conference. S. 267-272 (2019).
  [ Abstract ] [ BibTeX ]
   
  Responding fluently to user requests is important to keep them immersed. In this paper, we are presenting an extensive dataset to study the response time of YouTube's mobile video streaming service on Android. We illustrate the application of our dataset by studying YouTube's initial delay for a subset of 9 videos in 75 network scenarios. We find that in 41% of the cases, YouTube exceeds the attention span of a typical user, while deep immersion is only reached in 15% of the cases. Our factor analysis implies that the allocation of the initial CDN node is the critical link in this delay chain. Since our dataset includes a large variety of factors, we are describing setup, methodology, and data structure in detail. Our dataset and measurement tools are publicly available.
  @inproceedings{info3-inproceedings-2019-25, abstract = {Responding fluently to user requests is important to keep them immersed. In this paper, we are presenting an extensive dataset to study the response time of YouTube's mobile video streaming service on Android. We illustrate the application of our dataset by studying YouTube's initial delay for a subset of 9 videos in 75 network scenarios. We find that in 41% of the cases, YouTube exceeds the attention span of a typical user, while deep immersion is only reached in 15% of the cases. Our factor analysis implies that the allocation of the initial CDN node is the critical link in this delay chain. Since our dataset includes a large variety of factors, we are describing setup, methodology, and data structure in detail. Our dataset and measurement tools are publicly available.}, author = {Loh, Frank and Wamser, Florian and Moldovan, Christian and Zeidler, Bernd and Hoßfeld, Tobias and Tsilimantos, Dimitrios and Valentin, Stefan}, booktitle = {Proceedings of the 10th ACM Multimedia Systems Conference}, keywords = {myown huawei can}, month = 6, pages = {267-272}, title = {From click to playback: a dataset to study the response time of mobile YouTube}, year = 2019 }
• Striepe, H., Donnermann, M., Lein, M., Lugrin, B.: Modeling and Evaluating Emotion, Contextual Head Movement and Voices for a Social Robot Storyteller. International Journal of Social Robotics. (2019).
  [ BibTeX ] [ DOI ]
   
  @article{Striepe2019, author = {Striepe, Hendrik and Donnermann, Melissa and Lein, Martina and Lugrin, Birgit}, journal = {International Journal of Social Robotics}, keywords = {birgit donnermann lein mi myown striepe}, title = {Modeling and Evaluating Emotion, Contextual Head Movement and Voices for a Social Robot Storyteller}, year = 2019 }
• von Mammen, S., Müller, A., Latoschik, M.E., Botsch, M., Brukamp, K., Schröder, C., Wacker, M.: VIA VR: A Technology Platform for Virtual Adventures for Healthcare and Well-Being. VS-Games (2019).
  [ Abstract ] [ BibTeX ] [ URL ]
   
  To harness the potential of virtual reality (VR) in the healthcare sector, the expenditures for users such as clinics, doctors or health insurances, have to be reduced – a requirement the technology platform VIA VR (an acronym from “virtual reality adventures” and VR) promises to fulfill by combining several key technologies to allow specialists from the healthcare sector to create high-impact VR adventures without the need for a background in programming or the design of virtual worlds. This paper fleshes out the concept of VIA VR, its technological pillars and the planned R&D agenda.
  @inproceedings{von2019via, abstract = {To harness the potential of virtual reality (VR) in the healthcare sector, the expenditures for users such as clinics, doctors or health insurances, have to be reduced – a requirement the technology platform VIA VR (an acronym from “virtual reality adventures” and VR) promises to fulfill by combining several key technologies to allow specialists from the healthcare sector to create high-impact VR adventures without the need for a background in programming or the design of virtual worlds. This paper fleshes out the concept of VIA VR, its technological pillars and the planned R&D agenda.}, author = {von Mammen, Sebastian and M{ü}ller, Andreas and Latoschik, Marc Erich and Botsch, Mario and Brukamp, Kirsten and Schr{ö}der, Carsten and Wacker, Michael}, journal = {VS-Games}, keywords = {myown}, title = {VIA VR: A Technology Platform for Virtual Adventures for Healthcare and Well-Being}, year = 2019 }
• Chaplick, S., Lipp, F., Wolff, A., Zink, J.: Compact drawings of 1-planar graphs with right-angle crossings and few bends. Comput. Geom. 84, 50-68 (2019).
  [ BibTeX ] [ URL ]
   
  @article{journals/comgeo/ChaplickLWZ19, author = {Chaplick, Steven and Lipp, Fabian and Wolff, Alexander and Zink, Johannes}, journal = {Comput. Geom.}, keywords = {myown}, pages = {50-68}, title = {Compact drawings of 1-planar graphs with right-angle crossings and few bends.}, volume = 84, year = 2019 }
• Kalmbach, P., Hock, D., Lipp, F., Kellerer, W., Blenk, A.: NOracle: Who is communicating with whom in my network? SIGCOMM Posters and Demos. S. 48-50. ACM (2019).
  [ BibTeX ] [ URL ]
   
  @inproceedings{conf/sigcomm/KalmbachHLKB19, author = {Kalmbach, Patrick and Hock, David and Lipp, Fabian and Kellerer, Wolfgang and Blenk, Andreas}, booktitle = {SIGCOMM Posters and Demos}, crossref = {conf/sigcomm/2019p}, keywords = {myown}, pages = {48-50}, publisher = {ACM}, title = {NOracle: Who is communicating with whom in my network?}, year = 2019 }
• Baumeister, J., Sehne, V., Wienrich, C.: A Systematic View on Speech Assistants for Service Technicians. Proceedings of LWDA - Lernen. Wissen. Daten. Analysen 2019. S. 195-206. , Humboldt-Universität zu Berlin (2019).
  [ BibTeX ]
   
  @inproceedings{baumeister2019systematic, address = {Humboldt-Universität zu Berlin}, author = {Baumeister, Joachim and Sehne, Veronika and Wienrich, Carolin}, booktitle = {Proceedings of LWDA - Lernen. Wissen. Daten. Analysen 2019}, keywords = {knowwe myown rokt}, month = {oct}, pages = {195-206}, title = {A Systematic View on Speech Assistants for Service Technicians}, year = 2019 }
• Geiger, A., Bente, G., Lammers, S., Tepest, R., Roth, D., Bzdok, D., Vogeley, K.: Distinct functional roles of the mirror neuron system and the mentalizing system. NeuroImage. 202, 116102 (2019).
  [ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
   
  Movements can inform us about what people are doing and also about how they feel. This phenomenologically evident distinction has been suggested to correspond functionally with differential neural correlates denoted as mirror neuron system (MNS) and mentalizing system (MENT). To separate out the roles of the underlying systems we presented identical stimuli under different task demands: character animations showing everyday activities (mopping, sweeping) performed in different moods (angry, happy). Thirty-two participants were undergoing functional magnetic resonance imaging (fMRI) while asked to identify either the performed movement or the displayed mood. Univariate GLM analysis revealed the expected activation of either in MNS or MENT depending on the task. A complementary multivariate pattern-learning analysis based on the “social brain atlas” confirmed the expected recruitment of both systems. In conclusion, both approaches converge onto clearly distinct functional roles of both social neural networks in a novel dynamic social perception paradigm.
  @article{geiger2019distinct, abstract = {Movements can inform us about what people are doing and also about how they feel. This phenomenologically evident distinction has been suggested to correspond functionally with differential neural correlates denoted as mirror neuron system (MNS) and mentalizing system (MENT). To separate out the roles of the underlying systems we presented identical stimuli under different task demands: character animations showing everyday activities (mopping, sweeping) performed in different moods (angry, happy). Thirty-two participants were undergoing functional magnetic resonance imaging (fMRI) while asked to identify either the performed movement or the displayed mood. Univariate GLM analysis revealed the expected activation of either in MNS or MENT depending on the task. A complementary multivariate pattern-learning analysis based on the “social brain atlas” confirmed the expected recruitment of both systems. In conclusion, both approaches converge onto clearly distinct functional roles of both social neural networks in a novel dynamic social perception paradigm.}, author = {Geiger, Alexander and Bente, Gary and Lammers, Sebastian and Tepest, Ralf and Roth, Daniel and Bzdok, Danilo and Vogeley, Kai}, journal = {NeuroImage}, keywords = {droth insync myown}, pages = 116102, title = {Distinct functional roles of the mirror neuron system and the mentalizing system}, volume = 202, year = 2019 }
• Roth, D., Brübach, L., Westermeier, F., Schell, C., Feigl, T., Latoschik, M.E.: A Social Interaction Interface Supporting Affective Augmentation Based on Neuronal Data. Symposium on Spatial User Interaction (SUI '19), October 19--20, 2019, New Orleans, LA, USA (2019).
  [ Abstract ] [ BibTeX ] [ DOI ]
   
  In this demonstration we present a prototype for an avatar-mediated social interaction interface that supports the replication of head- and eye movement in distributed virtual environments. In addition to the retargeting of these natural behaviors, the system is capable of augmenting the interaction based on the visual presentation of affective states. We derive those states using neuronal data captured by electroencephalographic (EEG) sensing in combination with a machine learning driven classification of emotional states.
  @inproceedings{roth2019toappearsocial, abstract = {In this demonstration we present a prototype for an avatar-mediated social interaction interface that supports the replication of head- and eye movement in distributed virtual environments. In addition to the retargeting of these natural behaviors, the system is capable of augmenting the interaction based on the visual presentation of affective states. We derive those states using neuronal data captured by electroencephalographic (EEG) sensing in combination with a machine learning driven classification of emotional states.}, author = {Roth, Daniel and Brübach, Larissa and Westermeier, Franziska and Schell, Christian and Feigl, Tobias and Latoschik, Marc Erich}, booktitle = {Symposium on Spatial User Interaction (SUI '19), October 19--20, 2019, New Orleans, LA, USA}, keywords = {droth insync myown}, title = {A Social Interaction Interface Supporting Affective Augmentation Based on Neuronal Data}, volume = {SUI '19}, year = 2019 }
• Hirth, M., Borchert, K., Allendorf, F., Metzger, F., Hoßfeld, T.: Crowd-based Study of Gameplay Impairments and Player Performance in DOTA 2. 4th Internet-QoE Workshop: QoE-based Analysis and Management of Data Communication Networks (Internet-QoE'19). , Los Cabos, Mexico (2019).
  [ BibTeX ]
   
  @inproceedings{info3-inproceedings-2019-24, address = {Los Cabos, Mexico}, author = {Hirth, Matthias and Borchert, Kathrin and Allendorf, Fabian and Metzger, Florian and Hoßfeld, Tobias}, booktitle = {4th Internet-QoE Workshop: QoE-based Analysis and Management of Data Communication Networks (Internet-QoE'19)}, keywords = {myown ua-net}, month = 10, title = {Crowd-based Study of Gameplay Impairments and Player Performance in DOTA 2}, year = 2019 }
• Kargl, J.: Study of QoE Aspects of 3D Point Cloud Reduction, (2019).
  [ Abstract ] [ BibTeX ]
   
  Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Study of QoE Aspects of 3D Point Cloud Reduction Abstract: Point clouds are representations of three-dimensional points, which can be generated by laser scanners. As the recorded point clouds can be used to render computer-generated images and models, they are of particular interest in the domains of geographical and architectural engineering, as well for computer vision (e.g., games or virtual reality). However, point clouds have a huge storage demang, thus, point clouds shall be reduced by removing some of the points. In this work, it shall be studied how the reduction of 3D point clouds influences the QoE when watching images, videos, or interactive visualizations, which were rendered from point clouds. Titel: Untersuchung von QoE Aspekten bei der Reduzierung von 3D-Punktwolken Inhalt: Punktwolken sind Beschreibungen von dreidimensionalen Punkten, die z.B. mittels Laserscanner erzeugt werden. Da aus den aufgezeichneten Punktwolken computergenerierte Bilder und Modelle erzeugt werden können, spielen sie vor allem in Geographie und Bau, aber auch im Bereich der Computergraphik (z.B. bei Spielen oder virtueller Realität) eine Rolle. Jedoch haben Punktwolken einen sehr großen Speicherbedarf, der nach Möglichkeit durch Entfernen einzelner Punkte reduziert werden soll. In dieser Arbeit soll untersucht werden wie sich diese Reduzierung von 3D-Punktwolken auf die QoE auswirkt bei der Betrachtung von aus Punktwolken generierten Bildern, Videos, oder interaktiven Darstellungen.
  @mastersthesis{info3-bachelor-2019-13, abstract = {Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Study of QoE Aspects of 3D Point Cloud Reduction Abstract: Point clouds are representations of three-dimensional points, which can be generated by laser scanners. As the recorded point clouds can be used to render computer-generated images and models, they are of particular interest in the domains of geographical and architectural engineering, as well for computer vision (e.g., games or virtual reality). However, point clouds have a huge storage demang, thus, point clouds shall be reduced by removing some of the points. In this work, it shall be studied how the reduction of 3D point clouds influences the QoE when watching images, videos, or interactive visualizations, which were rendered from point clouds. Titel: Untersuchung von QoE Aspekten bei der Reduzierung von 3D-Punktwolken Inhalt: Punktwolken sind Beschreibungen von dreidimensionalen Punkten, die z.B. mittels Laserscanner erzeugt werden. Da aus den aufgezeichneten Punktwolken computergenerierte Bilder und Modelle erzeugt werden können, spielen sie vor allem in Geographie und Bau, aber auch im Bereich der Computergraphik (z.B. bei Spielen oder virtueller Realität) eine Rolle. Jedoch haben Punktwolken einen sehr großen Speicherbedarf, der nach Möglichkeit durch Entfernen einzelner Punkte reduziert werden soll. In dieser Arbeit soll untersucht werden wie sich diese Reduzierung von 3D-Punktwolken auf die QoE auswirkt bei der Betrachtung von aus Punktwolken generierten Bildern, Videos, oder interaktiven Darstellungen.}, author = {Kargl, Julian}, keywords = {myown}, school = {University of Würzburg}, title = {Study of QoE Aspects of 3D Point Cloud Reduction}, year = 2019 }
• Maiwald, F., Bruschke, J., Lehmann, C., Niebling, F.: A 4D information system for the exploration of multitemporal images and maps using photogrammetry, Web technologies and VR/AR. Virtual Archaeology Review. 10, 1-13 (2019).
  [ BibTeX ] [ DOI ]
   
  @article{maiwald2019information, author = {Maiwald, Ferdinand and Bruschke, Jonas and Lehmann, Christoph and Niebling, Florian}, editor = {Lerma, José Luis}, journal = {Virtual Archaeology Review}, keywords = {histstadt4d myown niebling}, month = {jul}, number = 21, pages = {1-13}, title = {A 4D information system for the exploration of multitemporal images and maps using photogrammetry, Web technologies and VR/AR}, volume = 10, year = 2019 }
• Wolz, M.: Hit Detection with Asymmetric Latency in UE4 Authoritative Multiplayer Games, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-bachelor-2019-10, author = {Wolz, Manuel}, keywords = {myown}, month = 8, school = {Universität Würzburg}, title = {Hit Detection with Asymmetric Latency in UE4 Authoritative Multiplayer Games}, year = 2019 }
• Eckstein, B., Krapp, E., Elsässer, A., Lugrin, B.: Smart substitutional reality: Integrating the smart home into virtual reality. Entertainment Computing. 31, 100306 (2019).
  [ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
   
  Recent advances in VR technology allow users to consume immersive content within their own living room. Substitutional Reality (SR) promises to enhance this experience by integrating the physical environment into the simulation. We propose a novel approach, called Smart Substitutional Reality (SSR), that extends the passive haptics of SR with the interactive functionality of a smart home environment. SSR is meant to serve as a foundation for serious games. In this paper, we describe the concept of SSR alongside the implementation of a prototype in our smart lab. We designed multiple virtual environments with a varying degree of mismatch compared to the real world, and added selected objects to induce additional haptic and thermal stimuli to increase immersion. In two user studies we investigate their impact on spatial presence and intrinsic motivation which are especially important for serious games. Results suggest that spatial presence is maintained with higher mismatch, and increased by inducing additional stimuli. Intrinsic motivation is increased in both cases.
  @article{ECKSTEIN2019100306, abstract = {Recent advances in VR technology allow users to consume immersive content within their own living room. Substitutional Reality (SR) promises to enhance this experience by integrating the physical environment into the simulation. We propose a novel approach, called Smart Substitutional Reality (SSR), that extends the passive haptics of SR with the interactive functionality of a smart home environment. SSR is meant to serve as a foundation for serious games. In this paper, we describe the concept of SSR alongside the implementation of a prototype in our smart lab. We designed multiple virtual environments with a varying degree of mismatch compared to the real world, and added selected objects to induce additional haptic and thermal stimuli to increase immersion. In two user studies we investigate their impact on spatial presence and intrinsic motivation which are especially important for serious games. Results suggest that spatial presence is maintained with higher mismatch, and increased by inducing additional stimuli. Intrinsic motivation is increased in both cases.}, author = {Eckstein, Benjamin and Krapp, Eva and Elsässer, Anne and Lugrin, Birgit}, journal = {Entertainment Computing}, keywords = {birgit mi myown}, pages = 100306, title = {Smart substitutional reality: Integrating the smart home into virtual reality}, volume = 31, year = 2019 }
• Janiak, T.: Investigating the Influence of Listener Attentiveness on the QoE of Music Streaming, (2019).
  [ BibTeX ]
   
  @mastersthesis{info3-bachelor-2019-12, author = {Janiak, Tim}, keywords = {myown}, school = {University of Würzburg}, title = {Investigating the Influence of Listener Attentiveness on the QoE of Music Streaming}, year = 2019 }
• Wolf, E., Klüber, S., Zimmerer, C., Lugrin, J.-L., Latoschik, M.E.: "Paint that object yellow": Multimodal Interaction to Enhance Creativity During Design Tasks in VR. Proceedings of the 21st ACM International Conference on Multimodal Interaction (ICMI '19). S. 195-204. ACM, New York, NY, USA (2019).
  [ BibTeX ] [ URL ] [ DOI ]
   
  @inproceedings{wolf2019paint, address = {New York, NY, USA}, author = {Wolf, Erik and Klüber, Sara and Zimmerer, Chris and Lugrin, Jean-Luc and Latoschik, Marc Erich}, booktitle = {Proceedings of the 21st ACM International Conference on Multimodal Interaction (ICMI '19)}, keywords = {ewolf mmi myown}, note = {Best Paper Runner-Up &#127942;}, organization = {ACM}, pages = {195-204}, title = {"Paint that object yellow": Multimodal Interaction to Enhance Creativity During Design Tasks in VR}, year = 2019 }
• Döllinger, N., Wienrich, C., Wolf, E., Botsch, M., Latoschik, M.E.: ViTraS - Virtual Reality Therapy by Stimulation of Modulated Body Image - Project Outline. Mensch und Computer 2019 - Workshopband. S. 606-611. Gesellschaft für Informatik e.V. (2019).
  [ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
   
  n the recent decades, obesity has become one of the major public health issues and is associated with severe other diseases. Although current multidisciplinary therapy approaches already include behavioral therapy techniques, the oftentimes remaining lack of psychotherapeutic support after surgery leads to relapses and renewed weight gain. This paper presents an overview of the project ViTraS-Virtual Reality Therapy by Stimulation of Modulated BodyImage - that addresses these challenges by (i) Developing an integrative model predicting the influential paths of immersive media for an effective behavioral change; (ii) Developing an augmented reality (AR)-mirror system enabling an effective therapy on body self-perception of patients, and (iii)Developing a multi-user virtual reality (VR)-system supply-ing social support from therapists and other patients. The three components of the ViTraS projects are briefly introduced, as well as a first VR-based prototype of the mirror system.
  @inproceedings{dollinger2019toappearvitras, abstract = {n the recent decades, obesity has become one of the major public health issues and is associated with severe other diseases. Although current multidisciplinary therapy approaches already include behavioral therapy techniques, the oftentimes remaining lack of psychotherapeutic support after surgery leads to relapses and renewed weight gain. This paper presents an overview of the project ViTraS-Virtual Reality Therapy by Stimulation of Modulated BodyImage - that addresses these challenges by (i) Developing an integrative model predicting the influential paths of immersive media for an effective behavioral change; (ii) Developing an augmented reality (AR)-mirror system enabling an effective therapy on body self-perception of patients, and (iii)Developing a multi-user virtual reality (VR)-system supply-ing social support from therapists and other patients. The three components of the ViTraS projects are briefly introduced, as well as a first VR-based prototype of the mirror system.}, author = {Döllinger, Nina and Wienrich, Carolin and Wolf, Erik and Botsch, Mario and Latoschik, Marc Erich}, booktitle = {Mensch und Computer 2019 - Workshopband}, keywords = {ewolf myown}, month = {sep}, pages = {606-611}, publisher = {Gesellschaft für Informatik e.V.}, title = {ViTraS - Virtual Reality Therapy by Stimulation of Modulated Body Image - Project Outline}, year = 2019 }
• Nogatz, F., Körner, P., Krings, S.: Prolog Coding Guidelines: Status and Tool Support. Technical Communications of the 35th International Conference on Logic Programming (ICLP) (2019).
  [ Abstract ] [ BibTeX ]
   
  The importance of coding guidelines is generally accepted throughout developers of every programming language. Naturally, Prolog makes no exception. However, establishing coding guidelines is fraught with obstacles: Finding common ground on kind and selection of rules is matter of debate; once found, adhering to or enforcing rules is complicated as well, not least because of Prolog’s flexible syntax without keywords. In this paper, we evaluate the status of coding guidelines in the Prolog community and discuss to what extent they can be automatically verified. We implemented a linter for Prolog and applied it to several packages to get a hold on the current state of the community.
  @inproceedings{nogatz2019prolog, abstract = {The importance of coding guidelines is generally accepted throughout developers of every programming language. Naturally, Prolog makes no exception. However, establishing coding guidelines is fraught with obstacles: Finding common ground on kind and selection of rules is matter of debate; once found, adhering to or enforcing rules is complicated as well, not least because of Prolog’s flexible syntax without keywords. In this paper, we evaluate the status of coding guidelines in the Prolog community and discuss to what extent they can be automatically verified. We implemented a linter for Prolog and applied it to several packages to get a hold on the current state of the community.}, author = {Nogatz, Falco and Körner, Philipp and Krings, Sebastian}, booktitle = {Technical Communications of the 35th International Conference on Logic Programming (ICLP)}, keywords = {myown}, note = {(to appear)}, title = {Prolog Coding Guidelines: Status and Tool Support}, year = 2019 }
• Hildebrand, K.: Impact of Rendering Times on the Perceived Loading Speed of Web Pages, (2019).
  [ Abstract ] [ BibTeX ]
   
  Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Impact of Rendering Times on the Perceived Loading Speed of Web Pages Abstract: The most dominant QoE (Quality of Experience, i.e., subjectively perceived quality) influence factor of web browsing is the page load time. However, pages do not load in a single event, but different parts of the web page are displayed at different rendering times. In this work, a study shall be conducted to investigate the impact of rendering times on the perceived loading speed of web pages. The results of the study shall be evaluated to derive recommendations for networking as well as rendering aspects of web browsing. Titel: Einfluss von Anzeigezeiten auf die wahrgenomme Ladegeschwindigkeit von Webseiten Inhalt: Der wichtigste Einflussfaktor auf die QoE (Quality of Experience, d.h. subjektiv empfundene Dienstgüte) beim Webbrowsing ist die Seitenladezeit. Jedoch laden Webseiten nicht auf einmal, sondern verschiedene Teile der Seite werden zu unterschiedlichen Zeitpunkten angezeigt. In dieser Arbeit soll eine Studie durchgeführt werden, mit der der Einfluss dieser Anzeigezeiten auf die wahrgenommene Ladegeschwindigkeit untersucht werden kann. Die Ergebnisse der Studie sollen ausgewehrtet werden, um Empfehlungen für Netzwerk- und Renderingaspekte beim Webbrowsen abzuleiten.
  @mastersthesis{info3-bachelor-2019-14, abstract = {Contact/Kontakt: michael.seufert@uni-wuerzburg.de Title: Impact of Rendering Times on the Perceived Loading Speed of Web Pages Abstract: The most dominant QoE (Quality of Experience, i.e., subjectively perceived quality) influence factor of web browsing is the page load time. However, pages do not load in a single event, but different parts of the web page are displayed at different rendering times. In this work, a study shall be conducted to investigate the impact of rendering times on the perceived loading speed of web pages. The results of the study shall be evaluated to derive recommendations for networking as well as rendering aspects of web browsing. Titel: Einfluss von Anzeigezeiten auf die wahrgenomme Ladegeschwindigkeit von Webseiten Inhalt: Der wichtigste Einflussfaktor auf die QoE (Quality of Experience, d.h. subjektiv empfundene Dienstgüte) beim Webbrowsing ist die Seitenladezeit. Jedoch laden Webseiten nicht auf einmal, sondern verschiedene Teile der Seite werden zu unterschiedlichen Zeitpunkten angezeigt. In dieser Arbeit soll eine Studie durchgeführt werden, mit der der Einfluss dieser Anzeigezeiten auf die wahrgenommene Ladegeschwindigkeit untersucht werden kann. Die Ergebnisse der Studie sollen ausgewehrtet werden, um Empfehlungen für Netzwerk- und Renderingaspekte beim Webbrowsen abzuleiten.}, author = {Hildebrand, Kathrin}, keywords = {myown}, school = {University of Würzburg}, title = {Impact of Rendering Times on the Perceived Loading Speed of Web Pages}, year = 2019 }
• Orsolic, I., Skorin-Kapov, L., Hoßfeld, T.: To Share or Not to Share? How Exploitation of Context Data Can Improve In-Network QoE Monitoring of Encrypted YouTube Streams. 2019 Eleventh International Conference on Quality of Multimedia Experience (QoMEX) (QoMEX 2019) (2019).
  [ Abstract ] [ BibTeX ]
   
  With the widespread use of encryption in Over the Top (OTT) traffic, Internet Service Providers (ISPs) for the most part lack insights into application performance, as well as into Quality of Experience (QoE) perceived by end users. Addressing challenges related to encryption, ISPs are looking into machine learning based solutions that can detect application performance solely from statistical properties of the traffic. On the other hand, OTT service providers are not willing to share service performance and content-related information with ISPs. While related work on OTT-ISP collaboration scenarios has addressed architectural aspects, business models, and to a certain extent incentives for sharing data, the focus of this paper is on the exchanged data itself. We investigate to what extent the performance of in-network machine learning based QoE estimation models for HTTP adaptive video streaming could be improved with the availability of certain context data provided by OTT providers. We motivate OTT-ISP collaboration through more accurate in-network QoE monitoring and potential improvement of user experience, which is of interest to both sides.
  @inproceedings{info3-article-2019-9, abstract = {With the widespread use of encryption in Over the Top (OTT) traffic, Internet Service Providers (ISPs) for the most part lack insights into application performance, as well as into Quality of Experience (QoE) perceived by end users. Addressing challenges related to encryption, ISPs are looking into machine learning based solutions that can detect application performance solely from statistical properties of the traffic. On the other hand, OTT service providers are not willing to share service performance and content-related information with ISPs. While related work on OTT-ISP collaboration scenarios has addressed architectural aspects, business models, and to a certain extent incentives for sharing data, the focus of this paper is on the exchanged data itself. We investigate to what extent the performance of in-network machine learning based QoE estimation models for HTTP adaptive video streaming could be improved with the availability of certain context data provided by OTT providers. We motivate OTT-ISP collaboration through more accurate in-network QoE monitoring and potential improvement of user experience, which is of interest to both sides.}, author = {Orsolic, Irena and Skorin-Kapov, Lea and Hoßfeld, Tobias}, booktitle = {2019 Eleventh International Conference on Quality of Multimedia Experience (QoMEX) (QoMEX 2019)}, keywords = {myown QoE YouTube encrypted learning machine monitoring traffic}, month = 6, title = {To Share or Not to Share? How Exploitation of Context Data Can Improve In-Network QoE Monitoring of Encrypted YouTube Streams}, year = 2019 }
• Niebling, F.: Visualizing Orientations of Large Numbers of Photographs. Proceedings of the 1st Workshop on Structuring and Understanding of Multimedia heritAge Contents. S. 1--2. ACM, Nice, France (2019).
  [ BibTeX ] [ URL ] [ DOI ]
   
  @inproceedings{Niebling:2019:VOL:3347317.3352729, address = {New York, NY, USA}, author = {Niebling, Florian}, booktitle = {Proceedings of the 1st Workshop on Structuring and Understanding of Multimedia heritAge Contents}, keywords = {histstadt4d myown niebling}, pages = {1--2}, publisher = {ACM}, series = {SUMAC '19}, title = {Visualizing Orientations of Large Numbers of Photographs}, year = 2019 }

2018 [ nach oben ]

• Navarro Bullock, B., Hotho, A., Stumme, G.: Accessing Information with Tags: Search and Ranking. In: Brusilovsky, P. und He, D. (hrsg.) Social Information Access: Systems and Technologies. S. 310--343. Springer International Publishing, Cham (2018).
  [ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
   
  With the growth of the Social Web, a variety of new web-based services arose and changed the way users interact with the internet and consume information. One central phenomenon was and is tagging which allows to manage, organize and access information in social systems. Tagging helps to manage all kinds of resources, making their access much easier. The first type of social tagging systems were social bookmarking systems, i.e., platforms for storing and sharing bookmarks on the web rather than just in the browser. Meanwhile, (hash-)tagging is central in many other Social Media systems such as social networking sites and micro-blogging platforms. To allow for efficient information access, special algorithms have been developed to guide the user, to search for information and to rank the content based on tagging information contributed by the users.
  @inbook{NavarroBullock2018, abstract = {With the growth of the Social Web, a variety of new web-based services arose and changed the way users interact with the internet and consume information. One central phenomenon was and is tagging which allows to manage, organize and access information in social systems. Tagging helps to manage all kinds of resources, making their access much easier. The first type of social tagging systems were social bookmarking systems, i.e., platforms for storing and sharing bookmarks on the web rather than just in the browser. Meanwhile, (hash-)tagging is central in many other Social Media systems such as social networking sites and micro-blogging platforms. To allow for efficient information access, special algorithms have been developed to guide the user, to search for information and to rank the content based on tagging information contributed by the users.}, address = {Cham}, author = {Navarro Bullock, Beate and Hotho, Andreas and Stumme, Gerd}, booktitle = {Social Information Access: Systems and Technologies}, editor = {Brusilovsky, Peter and He, Daqing}, keywords = {2018 folkrank folksonomy myown rank search tag}, pages = {310--343}, publisher = {Springer International Publishing}, title = {Accessing Information with Tags: Search and Ranking}, year = 2018 }
• Maiwald, F., Schneider, D., Henze, F., Münster, S., Niebling, F.: FEATURE MATCHING OF HISTORICAL IMAGES BASED ON GEOMETRY OF QUADRILATERALS. International Archives of the Photogrammetry, Remote Sensing & Spatial Information Sciences. 42, (2018).
  [ BibTeX ] [ URL ]
   
  @article{maiwald2018feature, author = {Maiwald, Ferdinand and Schneider, Danilo and Henze, Frank and M{ü}nster, Sander and Niebling, Florian}, journal = {International Archives of the Photogrammetry, Remote Sensing \& Spatial Information Sciences}, keywords = {myown niebling}, number = 2, title = {FEATURE MATCHING OF HISTORICAL IMAGES BASED ON GEOMETRY OF QUADRILATERALS.}, volume = 42, year = 2018 }
• Bruschke, J., Niebling, F., Wacker, M.: Visualization of Orientations of Spatial Historical Photographs. In: Sablatnig, R. und Wimmer, M. (hrsg.) Eurographics Workshop on Graphics and Cultural Heritage. The Eurographics Association (2018).
  [ BibTeX ]
   
  @inproceedings{gch2018bruschke, author = {Bruschke, Jonas and Niebling, Florian and Wacker, Markus}, booktitle = {Eurographics Workshop on Graphics and Cultural Heritage}, editor = {Sablatnig, Robert and Wimmer, Michael}, keywords = {myown niebling}, publisher = {The Eurographics Association}, title = {{Visualization of Orientations of Spatial Historical Photographs}}, year = 2018 }
• Stubenrauch, F.: On the Practicability of SDN in a University Network, (2018).
  [ Abstract ] [ BibTeX ]
   
  Contact: Alexej Grigorjew <alexej.grigorjew@informatik.uni-wuerzburg.de> The work should provide an overview of criteria that enable and encourage the use of modern concepts (such as NFV and SDN) in less agile networks with few operators and versatile traffic patterns. It should identify key influence factors that imply success and feasibility of the deployment of modern devices. In addition, a select choice of use cases shall be investigated by implementing them with modern utilities, and evaluated thereby to gain further insights.
  @mastersthesis{info3-master-2017-17, abstract = {Contact: Alexej Grigorjew <alexej.grigorjew@informatik.uni-wuerzburg.de> The work should provide an overview of criteria that enable and encourage the use of modern concepts (such as NFV and SDN) in less agile networks with few operators and versatile traffic patterns. It should identify key influence factors that imply success and feasibility of the deployment of modern devices. In addition, a select choice of use cases shall be investigated by implementing them with modern utilities, and evaluated thereby to gain further insights.}, author = {Stubenrauch, Florian}, keywords = {myown ngn}, school = {Universität Würzburg}, title = {On the Practicability of SDN in a University Network}, year = 2018 }
• Kryven, M., Ravsky, A., Wolff, A.: Drawing Graphs on Few Circles and Few Spheres. In: Frati, F. und Ma, K.-L. (hrsg.) Proc. 25th Int. Symp. Graph Drawing & Network Vis. (GD'17). S. 591--593. Springer-Verlag (2018).
  [ BibTeX ] [ URL ]
   
  @inproceedings{krw-dgfcf-GD17, author = {Kryven, Myroslav and Ravsky, Alexander and Wolff, Alexander}, booktitle = {Proc. 25th Int. Symp. Graph Drawing \& Network Vis. (GD'17)}, editor = {Frati, Fabrizio and Ma, Kwan-Liu}, keywords = {csuniwue myown}, note = {Poster}, pages = {591--593}, publisher = {Springer-Verlag}, series = {Lecture Notes in Computer Science}, title = {Drawing Graphs on Few Circles and Few Spheres}, volume = 10692, year = 2018 }
• Niebling, F., Latoschik, M.E.: Browsing Spatial Photography using Augmented Models. Proceedings of the 17th IEEE International Symposium on Mixed and Augmented Reality (ISMAR). IEEE, ACM (2018).
  [ BibTeX ] [ URL ]
   
  @inproceedings{niebling2018ismar, author = {Niebling, Florian and Latoschik, Marc Erich}, booktitle = {Proceedings of the 17th IEEE International Symposium on Mixed and Augmented Reality (ISMAR)}, keywords = {myown niebling}, month = {October}, publisher = {IEEE, ACM}, title = {Browsing Spatial Photography using Augmented Models}, year = 2018 }
• Borchert, K., Hirth, M., Kummer, M., Laitenberger, U., Slivko, O., Viet, S.: Unemployment and Online Labor, (2018).
  [ BibTeX ]
   
  @misc{info3-misc-2018-1, author = {Borchert, Kathrin and Hirth, Matthias and Kummer, Michael and Laitenberger, Ulrich and Slivko, Olga and Viet, Steffen}, howpublished = {http://ftp.zew.de/pub/zew-docs/dp/dp18023.pdf}, keywords = {myown}, title = {Unemployment and Online Labor}, year = 2018 }
• Rapp, D., Niebling, F., Latoschik, M.E.: The impact of Pokemon Go and why it’s not about Augmented Reality – Results from a Qualitative Survey. In: Worlds, 10th I.E.E.E.I.C. on V. und for Serious Applications (VS-Games), (hrsg.) Proceedings of the 10th IEEE International Conference on Virtual Worlds for Serious Applications (VS-Games). IEEE (2018).
  [ BibTeX ] [ URL ]
   
  @inproceedings{rapp2018pokemon, author = {Rapp, Daniel and Niebling, Florian and Latoschik, Marc Erich}, booktitle = {Proceedings of the 10th IEEE International Conference on Virtual Worlds for Serious Applications (VS-Games)}, editor = {10th IEEE International Conference on Virtual Worlds and for Serious Applications (VS-Games)}, keywords = {myown niebling}, publisher = {IEEE}, title = {The impact of Pokemon Go and why it’s not about Augmented Reality – Results from a Qualitative Survey}, year = 2018 }
• Horst-Schaper, G., Schaper, P.: [POSTER] Verletzungen mit infektiösem Material Ein Überblick über die Unfallmeldungen bei einem Maximalversorger in den Jahren 2001 bis 2017. 32. Freiburger Symposium Arbeitsmedizin im Gesundheitsdienst (2018).
  [ BibTeX ]
   
  @proceedings{horstschaper2018verletzungen, author = {Horst-Schaper, Gesa and Schaper, Philipp}, keywords = {myown schaper}, publisher = {32. Freiburger Symposium Arbeitsmedizin im Gesundheitsdienst}, title = {[POSTER] Verletzungen mit infektiösem Material Ein Überblick über die Unfallmeldungen bei einem Maximalversorger in den Jahren 2001 bis 2017}, volume = {32. Freiburger Symposium Arbeitsmedizin im Gesundheitsdienst}, year = 2018 }
• Bruschke, J., Niebling, F.: Räumliches Durchsuchen von Repositorien historischer Fotografien. In: Dachselt, R. und Weber, G. (hrsg.) Mensch und Computer 2018 - Workshopband. Gesellschaft für Informatik e.V., Bonn (2018).
  [ BibTeX ] [ URL ]
   
  @inproceedings{mci/Bruschke2018, address = {Bonn}, author = {Bruschke, Jonas and Niebling, Florian}, booktitle = {Mensch und Computer 2018 - Workshopband}, editor = {Dachselt, Raimund and Weber, Gerhard}, keywords = {myown niebling}, publisher = {Gesellschaft für Informatik e.V.}, title = {Räumliches Durchsuchen von Repositorien historischer Fotografien}, year = 2018 }
• Roth, D., Mal, D., Purps, C.F., Kullmann, P., Latoschik, M.E.: Injecting Nonverbal Mimicry with Hybrid Avatar-Agent Technologies: A Naïve Approach. Proceedings of the 6th ACM Symposium on Spatial User Interaction (SUI). ACM (2018).
  [ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
   
  Humans communicate to a large degree through nonverbal behavior. Nonverbal mimicry, i.e., the imitation of another’s behavior can positively affect the social interactions. In virtual environments, user behavior can be replicated to avatars, and agent behaviors can be artificially constructed. By combining both, hybrid avatar-agent technologies aim at actively mediating virtual communication to foster interpersonal understanding and rapport.We present a naïve prototype, the “Mimicry Injector”, that injects artificial mimicry in real-time virtual interactions. In an evaluation study, two participants were embodied in a Virtual Reality (VR) simulation, and had to perform a negotiation task. Their virtual characters either a) replicated only the original behavior or b) displayed the original behavior plus induced mimicry. We found that most participants did not detect the modification. However, the modification did not have a significant impact on the perception of the communication.
  @inproceedings{roth2018injecting, abstract = {Humans communicate to a large degree through nonverbal behavior. Nonverbal mimicry, i.e., the imitation of another’s behavior can positively affect the social interactions. In virtual environments, user behavior can be replicated to avatars, and agent behaviors can be artificially constructed. By combining both, hybrid avatar-agent technologies aim at actively mediating virtual communication to foster interpersonal understanding and rapport.We present a naïve prototype, the “Mimicry Injector”, that injects artificial mimicry in real-time virtual interactions. In an evaluation study, two participants were embodied in a Virtual Reality (VR) simulation, and had to perform a negotiation task. Their virtual characters either a) replicated only the original behavior or b) displayed the original behavior plus induced mimicry. We found that most participants did not detect the modification. However, the modification did not have a significant impact on the perception of the communication.}, author = {Roth, Daniel and Mal, David and Purps, Christian Felix and Kullmann, Peter and Latoschik, Marc Erich}, booktitle = {Proceedings of the 6th ACM Symposium on Spatial User Interaction (SUI)}, keywords = {droth injectx insync myown sui2018}, month = {October}, publisher = {ACM}, title = {Injecting Nonverbal Mimicry with Hybrid Avatar-Agent Technologies: A Naïve Approach}, year = 2018 }
• Fleszar, K., Mnich, M., Spoerhase, J.: New Algorithms for Maximum Disjoint Paths Based on Tree-Likeness. Mathematical Programming. 171, 433--461 (2018).
  [ BibTeX ] [ URL ] [ DOI ]
   
  @article{Fleszar2018, author = {Fleszar, Krzysztof and Mnich, Matthias and Spoerhase, Joachim}, journal = {Mathematical Programming}, keywords = {approximability disjoint edge fl-info1 graph key myown path routing tree}, month = {nov}, number = {1-2}, pages = {433--461}, title = {New Algorithms for Maximum Disjoint Paths Based on Tree-Likeness}, volume = 171, year = 2018 }
• Chaplick, S., Lipp, F., Wolff, A., Zink, J.: Compact Drawings of 1-Planar Graphs with Right-Angle Crossings and Few Bends. In: Biedl, T. und Kerren, A. (hrsg.) Proc. 26th Int. Symp. Graph Drawing & Network Vis. (GD'18). S. 137--151. Springer-Verlag (2018).
  [ BibTeX ] [ DOI ]
   
  @inproceedings{clwz-cd1pg-GD18, author = {Chaplick, Steven and Lipp, Fabian and Wolff, Alexander and Zink, Johannes}, booktitle = {Proc. 26th Int. Symp. Graph Drawing \& Network Vis. (GD'18)}, editor = {Biedl, Therese and Kerren, Andreas}, keywords = {csuniwue gd-info1 myown}, pages = {137--151}, publisher = {Springer-Verlag}, series = {Lecture Notes in Computer Science}, title = {Compact Drawings of 1-Planar Graphs with Right-Angle Crossings and Few Bends}, volume = 11282, year = 2018 }
• Hirth, M., Lange, S., Seufert, M., Tran-Gia, P.: Performance Evaluation of Mobile Crowdsensing for Event Detection. Proceedings of the 5th International Workshop on Crowd Assisted Sensing, Pervasive Systems and Communications. , Athens, Greece (2018).
  [ Abstract ] [ BibTeX ]
   
  Crowdsensing offers a cost effective way to collect large amounts of sensor data. However, in contrast to fixed sensor deployments, the spatial distribution of the sensors can hardly be influence, as the sensors are carried by participants of the crowdsensing system. This in turn raises the question about the performance of such systems with respect to the detection probability and detection time of spatial events. In order to address this question, we analyze the performance of such a crowdsensing system by means of simulation. We use the traffic infrastructure of a small size city in Germany and simulate the inhabitants’ movement patterns with the well established SUMO mobility generator. Our results show that even if only a small share of inhabitants participates in crowdsensing, events, which have locations that are correlated with the population density, can be easily and quickly detected using such a system. On the contrary, events whose locations are uniformly randomly distributed are much harder to detect using a crowdsensing approach.
  @inproceedings{info3-inproceedings-2017-21, abstract = {Crowdsensing offers a cost effective way to collect large amounts of sensor data. However, in contrast to fixed sensor deployments, the spatial distribution of the sensors can hardly be influence, as the sensors are carried by participants of the crowdsensing system. This in turn raises the question about the performance of such systems with respect to the detection probability and detection time of spatial events. In order to address this question, we analyze the performance of such a crowdsensing system by means of simulation. We use the traffic infrastructure of a small size city in Germany and simulate the inhabitants’ movement patterns with the well established SUMO mobility generator. Our results show that even if only a small share of inhabitants participates in crowdsensing, events, which have locations that are correlated with the population density, can be easily and quickly detected using such a system. On the contrary, events whose locations are uniformly randomly distributed are much harder to detect using a crowdsensing approach.}, address = {Athens, Greece}, author = {Hirth, Matthias and Lange, Stanislav and Seufert, Michael and Tran-Gia, Phuoc}, booktitle = {Proceedings of the 5th International Workshop on Crowd Assisted Sensing, Pervasive Systems and Communications}, keywords = {myown}, month = 3, title = {Performance Evaluation of Mobile Crowdsensing for Event Detection}, year = 2018 }
• Roth, D., Kullmann, P., Bente, G., Gall, D., Latoschik, M.E.: Effects of Hybrid and Synthetic Social Gaze in Avatar-Mediated Interactions. Adjunct Proceedings of the 17th IEEE International Symposium on Mixed and Augmented Reality (ISMAR). IEEE, ACM (2018).
  [ Abstract ] [ BibTeX ] [ URL ]
   
  Human gaze is a crucial element in social interactions and therefore an important topic for social Augmented, Mixed, and Virtual Reality (AR,MR,VR) applications. In this paper we systematically compare four modes of gaze transmission: (1) natural gaze, (2) hybrid gaze, which combines natural gaze transmission with a social gaze model, (3) synthesized gaze, which combines a random gaze transmission with a social gaze model, and (4) purely random gaze. Investigating dyadic interactions, results show a linear trend for the perception of virtual rapport, trust, and interpersonal attraction, suggesting that these measures increase with higher naturalness and social adequateness of the transmission mode. We further investigated the perception of realism as well as the resulting gaze behavior of the avatars and the human participants. We discuss these results and their implications.
  @inproceedings{roth2018effects, abstract = {Human gaze is a crucial element in social interactions and therefore an important topic for social Augmented, Mixed, and Virtual Reality (AR,MR,VR) applications. In this paper we systematically compare four modes of gaze transmission: (1) natural gaze, (2) hybrid gaze, which combines natural gaze transmission with a social gaze model, (3) synthesized gaze, which combines a random gaze transmission with a social gaze model, and (4) purely random gaze. Investigating dyadic interactions, results show a linear trend for the perception of virtual rapport, trust, and interpersonal attraction, suggesting that these measures increase with higher naturalness and social adequateness of the transmission mode. We further investigated the perception of realism as well as the resulting gaze behavior of the avatars and the human participants. We discuss these results and their implications.}, author = {Roth, Daniel and Kullmann, Peter and Bente, Gary and Gall, Dominik and Latoschik, Marc Erich}, booktitle = {Adjunct Proceedings of the 17th IEEE International Symposium on Mixed and Augmented Reality (ISMAR)}, keywords = {droth injectx insync myown}, month = {October}, organization = {IEEE, ACM}, publisher = {IEEE, ACM}, title = {Effects of Hybrid and Synthetic Social Gaze in Avatar-Mediated Interactions}, year = 2018 }
• Roth, D., Wienrich, C.: Effects of Media Immersiveness on the Perception of Virtual Characters. In: Dörner, R., Grimm, P., und Geiger, C. (hrsg.) Proceedings of the 15th Workshop on Virtual and Augmented Reality of the GI Special Interest Group VR/AR (2018).
  [ Abstract ] [ BibTeX ]
   
  Virtual characters are widely used in digital media and entertainment, and become more frequent in Virtual Reality (VR) applications. Multiple previous works assessed the perception of virtual characters. Yet, a comparison of the effects of non-immersive and immersive settings on character perception and affect recognition has not been presented. Therefore, we conducted a mixed-design study, that assessed the perception of virtual characters in a desktop setting compared to an immersive VR setting. The piloting findings revealed that although typical evaluation dimensions such as humanness or eeriness did not differ significantly, socially related judgments such as sympathy, attractiveness, and trust showed significant differences between the media. We conclude that these dimensions need further assessments, and suggest that pretesting may be done best in the target media.
  @inproceedings{roth2018effects, abstract = {Virtual characters are widely used in digital media and entertainment, and become more frequent in Virtual Reality (VR) applications. Multiple previous works assessed the perception of virtual characters. Yet, a comparison of the effects of non-immersive and immersive settings on character perception and affect recognition has not been presented. Therefore, we conducted a mixed-design study, that assessed the perception of virtual characters in a desktop setting compared to an immersive VR setting. The piloting findings revealed that although typical evaluation dimensions such as humanness or eeriness did not differ significantly, socially related judgments such as sympathy, attractiveness, and trust showed significant differences between the media. We conclude that these dimensions need further assessments, and suggest that pretesting may be done best in the target media.}, author = {Roth, Daniel and Wienrich, Carolin}, booktitle = {Proceedings of the 15th Workshop on Virtual and Augmented Reality of the GI Special Interest Group VR/AR}, editor = {Dörner, Ralf and Grimm, Paul and Geiger, Christian}, keywords = {droth insync myown}, month = {October}, title = {Effects of Media Immersiveness on the Perception of Virtual Characters}, year = 2018 }
• Chan, T.M., van Dijk, T.C., Fleszar, K., Spoerhase, J., Wolff, A.: Stabbing Rectangles by Line Segments -- How Decomposition Reduces the Shallow-Cell Complexity. Proc. 29th International Symposium on Algorithms and Computation (ISAAC'18) (2018).
  [ BibTeX ] [ URL ]
   
  @inproceedings{chan-etal18:stabbing, author = {Chan, Timothy M. and van Dijk, Thomas C. and Fleszar, Krzysztof and Spoerhase, Joachim and Wolff, Alexander}, booktitle = {Proc. 29th International Symposium on Algorithms and Computation (ISAAC'18)}, keywords = {approximability complexity cover geometric myown rectangle set shallow-cell stabbing}, note = {to appear}, title = {Stabbing Rectangles by Line Segments -- How Decomposition Reduces the Shallow-Cell Complexity}, year = 2018 }
• Zimmerer, C., Fischbach, M., Latoschik, M.E.: Space Tentacles - Integrating Multimodal Input into a VR Adventure Game. Proceedings of the 25th IEEE Virtual Reality (VR) conference. IEEE (2018).
  [ Abstract ] [ BibTeX ] [ URL ]
   
  Multimodal interfaces for Virtual Reality (VR), e.g., based on speech and gesture input/output (I/O), often exhibit complex system architectures. Tight couplings between the required I/O processing stages and the underlying scene representation and the simulator system’s flow-of-control tend to result in high development and maintainability costs. This paper presents a maintainable solution for realizing such interfaces by means of a cherry-picking approach. A reusable multimodal I/O processing platform is combined with the simulation and rendering capabilities of the Unity game engine, allowing to exploit the game engine’s superior API usability and tool support. The approach is illustrated based on the development of a multimodal VR adventure game called Space Tentacles.
  @inproceedings{zimmerer2018space, abstract = {Multimodal interfaces for Virtual Reality (VR), e.g., based on speech and gesture input/output (I/O), often exhibit complex system architectures. Tight couplings between the required I/O processing stages and the underlying scene representation and the simulator system’s flow-of-control tend to result in high development and maintainability costs. This paper presents a maintainable solution for realizing such interfaces by means of a cherry-picking approach. A reusable multimodal I/O processing platform is combined with the simulation and rendering capabilities of the Unity game engine, allowing to exploit the game engine’s superior API usability and tool support. The approach is illustrated based on the development of a multimodal VR adventure game called Space Tentacles.}, author = {Zimmerer, Chris and Fischbach, Martin and Latoschik, Marc Erich}, booktitle = {Proceedings of the 25th IEEE Virtual Reality (VR) conference}, keywords = {mmi myown simx}, publisher = {IEEE}, title = {Space Tentacles - Integrating Multimodal Input into a VR Adventure Game}, year = 2018 }
• Bloch, C., Roth, D., Vogeley, K.: Seeing It Your Way: Spatial Perspective Taking as a Mechanism for Interpersonal Understanding. Presentation on the 68th Annual Conference of the International Communication Association (ICA), May 24-28, Prague, Czech Republic. (2018).
  [ BibTeX ]
   
  @article{bloch2018seeing, author = {Bloch, Carola and Roth, Daniel and Vogeley, Kai}, journal = {Presentation on the 68th Annual Conference of the International Communication Association (ICA), May 24-28, Prague, Czech Republic}, keywords = {droth insync myown}, title = {Seeing It Your Way: Spatial Perspective Taking as a Mechanism for Interpersonal Understanding}, year = 2018 }
• Chimani, M., Felsner, S., Kobourov, S., Ueckerdt, T., Valtr, P., Wolff, A.: On the Maximum Crossing Number. Journal of Graph Algorithms & Applications. 22, 67--87 (2018).
  [ Abstract ] [ BibTeX ] [ URL ] [ DOI ]
   
  Research about crossings is typically about minimization. In this paper, we consider emphmaximizing the number of crossings over all possible ways to draw a given graph in the plane. Alpert et al. [Electron. J. Combin., 2009] conjectured that any graph has a emphconvex straight-line drawing, that is, a drawing with vertices in convex position, that maximizes the number of edge crossings. We disprove this conjecture by constructing a planar graph on twelve vertices that admits a non-convex drawing with more crossings than any convex drawing. Bald et al. [Proc. COCOON, 2016] showed that it is NP-hard to compute the maximum number of crossings of a geometric graph and that the weighted geometric case is NP-hard to approximate. We strengthen these results by showing hardness of approximation even for the unweighted geometric case. We also prove that the unweighted topological case is NP-hard.
  @article{cfkuvw-mcn-JGAA18, abstract = {Research about crossings is typically about minimization. In this paper, we consider \emph{maximizing} the number of crossings over all possible ways to draw a given graph in the plane. Alpert et al. [Electron. J. Combin., 2009] conjectured that any graph has a \emph{convex} straight-line drawing, that is, a drawing with vertices in convex position, that maximizes the number of edge crossings. We disprove this conjecture by constructing a planar graph on twelve vertices that admits a non-convex drawing with more crossings than any convex drawing. Bald et al. [Proc. COCOON, 2016] showed that it is NP-hard to compute the maximum number of crossings of a geometric graph and that the weighted geometric case is NP-hard to approximate. We strengthen these results by showing hardness of approximation even for the unweighted geometric case. We also prove that the unweighted topological case is NP-hard.}, author = {Chimani, Markus and Felsner, Stefan and Kobourov, Stephen and Ueckerdt, Torsten and Valtr, Pavel and Wolff, Alexander}, journal = {Journal of Graph Algorithms \& Applications}, keywords = {APX-hard NP-hard csuniwue gd-info1 graph_drawing maximum_convex_crossing_number maximum_crossing_number maximum_rectilinear_crossing_number myown}, note = {Special issue on ``Graph Drawing Beyond Planarity''.}, number = 1, pages = {67--87}, title = {On the Maximum Crossing Number}, volume = 22, year = 2018 }
• Niebling, F., Münster, S., Bruschke, J., Maiwald, F., Friedrichs, K.: Stadtgeschichtliche Forschung anhand räumlich- und zeitlich verorteter Photographien. In: Burghardt, M. und Müller-Birn, C. (hrsg.) INF-DH-2018. Gesellschaft für Informatik e.V., Bonn (2018).
  [ BibTeX ] [ URL ]
   
  @inproceedings{mci/Niebling2018, address = {Bonn}, author = {Niebling, Florian and Münster, Sander and Bruschke, Jonas and Maiwald, Ferdinand and Friedrichs, Kristina}, booktitle = {INF-DH-2018}, editor = {Burghardt, Manuel and Müller-Birn, Claudia}, keywords = {histstadt4d myown niebling}, publisher = {Gesellschaft für Informatik e.V.}, title = {Stadtgeschichtliche Forschung anhand räumlich- und zeitlich verorteter Photographien}, year = 2018 }
• Metter, C., Burger, V., Hu, Z., Pei, K., Wamser, F.: Towards an Active Probing Extension for the ONOS SDN Controller. 2018 28th International Telecommunication Networks and Applications Conference (ITNAC) (ITNAC 2018). S. 8. , Sydney, Australia (2018).
  [ Abstract ] [ BibTeX ]
   
  Network monitoring is a complex task and is always a trade-off between granularity of information and the performance impact of the monitoring itself on the network. SDN controllers, such as the ONOS SDN controller make this challenge easier as they can supply centralized information over the whole network. In our previous work we mathematically analyzed the built-in detection mechanism of ONOS and revealed a lack of detection performance and the vulnerability of this process to jitter. These results were also verified by measurements. In this paper we present an Active Probing extension for the ONOS SDN controller that overcomes these shortcomings by emitting probing packets that are transmitted through the network. Statistics over a history of those packets allow for the detection of packet loss. The evaluation by the means of measurements proves the benefits in terms of detection performance and controller load of this application. Furthermore, our extension is able to detect jitter being present in the network and to automatically adapt the probing process to these conditions.
  @inproceedings{info3-inproceedings-2018-34, abstract = {Network monitoring is a complex task and is always a trade-off between granularity of information and the performance impact of the monitoring itself on the network. SDN controllers, such as the ONOS SDN controller make this challenge easier as they can supply centralized information over the whole network. In our previous work we mathematically analyzed the built-in detection mechanism of ONOS and revealed a lack of detection performance and the vulnerability of this process to jitter. These results were also verified by measurements. In this paper we present an Active Probing extension for the ONOS SDN controller that overcomes these shortcomings by emitting probing packets that are transmitted through the network. Statistics over a history of those packets allow for the detection of packet loss. The evaluation by the means of measurements proves the benefits in terms of detection performance and controller load of this application. Furthermore, our extension is able to detect jitter being present in the network and to automatically adapt the probing process to these conditions.}, address = {Sydney, Australia}, author = {Metter, Christopher and Burger, Valentin and Hu, Zheng and Pei, Ke and Wamser, Florian}, booktitle = {2018 28th International Telecommunication Networks and Applications Conference (ITNAC) (ITNAC 2018)}, keywords = {myown sdn-ras can 5g-net}, month = 11, pages = 8, title = {Towards an Active Probing Extension for the {ONOS} {SDN} Controller}, year = 2018 }
• Volodina, E., Aziz, A., Rathgeb, E., Hoßfeld, T.: Application of Visual Analysis to Detect and Analyze Patterns in VoIP Attack Traffic. 17th IEEE International Conference On Trust, Security And Privacy In Computing And Communications/12th IEEE International Conference On Big Data Science And Engineering (TrustCom/BigDataSE) (2018).
  [ BibTeX ]
   
  @inproceedings{info3-inproceedings-2018-35, author = {Volodina, Ekaterina and Aziz, Adnan and Rathgeb, Erwin and Hoßfeld, Tobias}, booktitle = {17th IEEE International Conference On Trust, Security And Privacy In Computing And Communications/12th IEEE International Conference On Big Data Science And Engineering (TrustCom/BigDataSE)}, keywords = {myown}, month = 8, title = {Application of Visual Analysis to Detect and Analyze Patterns in VoIP Attack Traffic}, year = 2018 }
• Borchert, K., Lange, S., Zinner, T., Hirth, M.: Identification of Delay Thresholds Representing the Perceived Quality of Enterprise Applications. The 2nd International Workshop on Quality of Experience Management. , Sardinia, Italy (2018).
  [ BibTeX ]
   
  @inproceedings{info3-inproceedings-2018-11, address = {Sardinia, Italy}, author = {Borchert, Kathrin and Lange, Stanislav and Zinner, Thomas and Hirth, Matthias}, booktitle = {The 2nd International Workshop on Quality of Experience Management}, keywords = {myown kpi-it ua-net}, month = 5, title = {Identification of Delay Thresholds Representing the Perceived Quality of Enterprise Applications}, year = 2018 }
• Lugrin, J.-L., Ertl, M., Krop, P., Klüpfel, R., Stierstorfer, S., Weisz, B., Rück, M., Schmitt, J., Schmidt, N., Latoschik, M.E.: Any ”Body” There? - Avatar Visibility Effects in a Virtual Reality Game. 2018 IEEE Conference on Virtual Reality and 3D User Interfaces (VR). S. 17-24. IEEE (2018).
  [ BibTeX ] [ URL ]
   
  @inproceedings{lugrin2018there, author = {Lugrin, Jean-Luc and Ertl, Maximilian and Krop, Philipp and Klüpfel, Richard and Stierstorfer, Sebastian and Weisz, Bianka and Rück, Maximilian and Schmitt, Johann and Schmidt, Nina and Latoschik, Marc Erich}, booktitle = {2018 IEEE Conference on Virtual Reality and 3D User Interfaces (VR)}, keywords = {lugrin myown}, organization = {IEEE}, pages = {17-24}, title = {Any ”Body” There? - Avatar Visibility Effects in a Virtual Reality Game}, year = 2018 }
• Byrka, J., Sornat, K., Spoerhase, J.: Constant-Factor Approximation for Ordered k-Median. Proc. 50th Annual ACM Symposium on the Theory of Computing (STOC'18). S. 620--631 (2018).
  [ BibTeX ] [ URL ] [ DOI ]
   
  @inproceedings{jaroslawbyrkakrzysztofsornat2018constantfactor, author = {Byrka, Jaroslaw and Sornat, Krzysztof and Spoerhase, Joachim}, booktitle = {Proc. 50th Annual ACM Symposium on the Theory of Computing (STOC'18)}, keywords = {approximability clustering fl-info1 k-median key myown}, pages = {620--631}, title = {Constant-Factor Approximation for Ordered k-Median}, year = 2018 }
• Janiak, L.: Impact of the measurement design on application behavior of video streaming, (2018).
  [ BibTeX ]
   
  @mastersthesis{info3-bachelor-2018-1, author = {Janiak, Lea}, keywords = {myown can}, month = 8, school = {University of Würzburg}, title = {Impact of the measurement design on application behavior of video streaming}, year = 2018 }
• Stauffert, J.-P., Niebling, F., Latoschik, M.E.: Effects of Latency Jitter on Simulator Sickness in a Search Task. 25th IEEE Conference on Virtual Reality and 3D User Interfaces (IEEE VR). S. 121-127 (2018).
  [ Abstract ] [ BibTeX ] [ URL ]
   
  Low latency is a fundamental requirement for Virtual Reality (VR) systems to reduce the potential risks of cybersickness and to increase effectiveness, efficiency and user experience. In contrast to the effects of uniform latency degradation, the influence of latency jitter on user experience in VR is not well researched, although todayu0027s consumer VR systems are vulnerable in this respect. In this work we report on the impact of latency jitter on cybersickness in HMD-based VR environments. Test subjects are given a search task in Virtual Reality, provoking both head rotation and translation. One group experienced artificially added latency jitter in the tracking data of their head-mounted display. The introduced jitter pattern was a replication of a real-world latency behavior extracted and analyzed from an existing example VR-system. The effects of the introduced latency jitter were measured based on self-reports simulator sickness questionnaire (SSQ) and by taking physiological measurements. We found a significant increase in self-reported simulator sickness. We therefore argue that measure and control of latency based on average values taken at a few time intervals is not enough to assure a required timeliness behavior but that latency jitter needs to be considered when designing experiences for Virtual Reality.
  @inproceedings{stauffert2018effects, abstract = {Low latency is a fundamental requirement for Virtual Reality (VR) systems to reduce the potential risks of cybersickness and to increase effectiveness, efficiency and user experience. In contrast to the effects of uniform latency degradation, the influence of latency jitter on user experience in VR is not well researched, although today\u0027s consumer VR systems are vulnerable in this respect. In this work we report on the impact of latency jitter on cybersickness in HMD-based VR environments. Test subjects are given a search task in Virtual Reality, provoking both head rotation and translation. One group experienced artificially added latency jitter in the tracking data of their head-mounted display. The introduced jitter pattern was a replication of a real-world latency behavior extracted and analyzed from an existing example VR-system. The effects of the introduced latency jitter were measured based on self-reports simulator sickness questionnaire (SSQ) and by taking physiological measurements. We found a significant increase in self-reported simulator sickness. We therefore argue that measure and control of latency based on average values taken at a few time intervals is not enough to assure a required timeliness behavior but that latency jitter needs to be considered when designing experiences for Virtual Reality.}, author = {Stauffert, Jan-Philipp and Niebling, Florian and Latoschik, Marc Erich}, booktitle = {25th IEEE Conference on Virtual Reality and 3D User Interfaces (IEEE VR)}, keywords = {myown niebling stauffert}, pages = {121-127}, title = {Effects of Latency Jitter on Simulator Sickness in a Search Task}, year = 2018 }
• Gray, N., Lange, S., Zinner, T., Pfaff, B., Hock, D.: Evaluation of a Distributed Control Plane for Managing Heterogeneous SDN-enabled and Legacy Networks. 7th International Conference on Communications and Electronics (ICCE). , Hue, Vietnam (2018).
  [ Abstract ] [ BibTeX ]
   
  With the increasing number of devices, protocols and applications, today’s networks are becoming more and more complex. Hence, Software-defined Networking (SDN) tries to ad- dress this issue by separating the data from the control plane and by providing centralized interfaces for network configuration. As legacy devices cannot be replaced instantly due to high costs, both network segments have to be operated in coexistence with defined joints at their edges. To ensure a smooth operation, both controlling instances of these segments are required to exchange information. In this work, we design and implement a data model for storing the information needed to keep the controller and a Network Management System (NMS) synchronized, which are responsible for configuring the SDN-enabled network and the legacy devices respectively. For this, we implement and evaluate a total of three different synchronization strategies by the example of an SDN-based Bring Your Own Device (BYOD) use case. Index Terms—SDN, NMS, Management, Integration, Hetero- geneous Networks, Distributed Control Plane.
  @inproceedings{info3-inproceedings-2018-33, abstract = {With the increasing number of devices, protocols and applications, today’s networks are becoming more and more complex. Hence, Software-defined Networking (SDN) tries to ad- dress this issue by separating the data from the control plane and by providing centralized interfaces for network configuration. As legacy devices cannot be replaced instantly due to high costs, both network segments have to be operated in coexistence with defined joints at their edges. To ensure a smooth operation, both controlling instances of these segments are required to exchange information. In this work, we design and implement a data model for storing the information needed to keep the controller and a Network Management System (NMS) synchronized, which are responsible for configuring the SDN-enabled network and the legacy devices respectively. For this, we implement and evaluate a total of three different synchronization strategies by the example of an SDN-based Bring Your Own Device (BYOD) use case. Index Terms—SDN, NMS, Management, Integration, Hetero- geneous Networks, Distributed Control Plane.}, address = {Hue, Vietnam}, author = {Gray, Nicholas and Lange, Stanislav and Zinner, Thomas and Pfaff, Benedikt and Hock, David}, booktitle = {7th International Conference on Communications and Electronics (ICCE)}, keywords = {myown sardine ngn 5g-net}, month = 7, title = {Evaluation of a Distributed Control Plane for Managing Heterogeneous SDN-enabled and Legacy Networks}, year = 2018 }
• Gall, D., Latoschik, M.E.: The Effect of Haptic Prediction Accuracy on Presence. Proceedings of the 25th IEEE Virtual Reality (VR) conference (2018).
  [ Abstract ] [ BibTeX ] [ URL ]
   
  This paper reports on the effect of visually-anchored prediction accuracy of haptic information on the perceived presence of virtual environments. We designed an experiment which explicitly prevented confounding factors potentially introduced by virtual body ownership and/or agency. The experimental design consisted of two main conditions defining congruent vs incongruent visual and haptic cues. Presence was measured during as well as after exposure. A distance estimation task solely based on motor action and the visually-anchored spatial model of the environment was executed to control for perceptual binding. 56 healthy volunteers were randomly assigned to one of two groups in a single-blind mixed-group design study. The study revealed increased presence for high prediction accuracy and decreased presence for low prediction accuracy, while perceptual binding still occurred. The observed effect sizes were in the medium range. The results indicate a significant correlation between prediction accuracy of haptic information and the perceived realness and presence of a virtual environment which gives rise to a discussion about models for dissociative symptom derealisation.
  @inproceedings{gall2018effect, abstract = {This paper reports on the effect of visually-anchored prediction accuracy of haptic information on the perceived presence of virtual environments. We designed an experiment which explicitly prevented confounding factors potentially introduced by virtual body ownership and/or agency. The experimental design consisted of two main conditions defining congruent vs incongruent visual and haptic cues. Presence was measured during as well as after exposure. A distance estimation task solely based on motor action and the visually-anchored spatial model of the environment was executed to control for perceptual binding. 56 healthy volunteers were randomly assigned to one of two groups in a single-blind mixed-group design study. The study revealed increased presence for high prediction accuracy and decreased presence for low prediction accuracy, while perceptual binding still occurred. The observed effect sizes were in the medium range. The results indicate a significant correlation between prediction accuracy of haptic information and the perceived realness and presence of a virtual environment which gives rise to a discussion about models for dissociative symptom derealisation.}, author = {Gall, Dominik and Latoschik, Marc Erich}, booktitle = {Proceedings of the 25th IEEE Virtual Reality (VR) conference}, keywords = {myown}, title = {The Effect of Haptic Prediction Accuracy on Presence}, year = 2018 }
• Hamzeheinejad, N., Straka, S., Gall, D., Weilbach, F., Latoschik, M.E.: Immersive Robot-Assisted Virtual Reality Therapy for Neurologically-Caused Gait Impairments. Proceedings of the 25th IEEE Virtual Reality (VR) conference. (2018).
  [ Abstract ] [ BibTeX ] [ URL ]
   
  This paper presents an immersive Virtual Reality (VR) therapy system for gait rehabilitation after neurological impairments, e.g., caused by accidents or strokes: The system targets increase of patientsu0027 motivation to perform the repeated exercise by providing stimulating virtual exercise environments with the final goal to increase therapy efficiency and effectiveness. Instead of simply working out on immobile stationary devices, the system allows them to walk through and explore a stimulating virtual world. Patients are immersed in the virtual environments using a Head-Mounted Display (HMD). Walking patterns are captured by motion sensors attached to the patientsu0027 feet to synchronize locomotion speed between the real and the virtual world. A user-centered design process evaluated usability, user experience, and feasibility to confirm the overall goals of the system before any sensitive clinical trials with impaired patients can start. Overall, the results demonstrated an encouraging user experience and acceptance while it did not induce any unwanted side-effects, e.g., nausea or cyber-sickness.
  @article{hamzeheinejad2018immersive, abstract = {This paper presents an immersive Virtual Reality (VR) therapy system