@article{65757,
  abstract     = {{Electrifying the heating sector is essential for achieving global climate targets like the Paris Agreement’s 1.5 °C goal. In Germany, where 80  % of household energy goes to space heating and hot water, shifting to low-carbon solutions is crucial. Fossil-fuelled district heating networks can incorporate renewable energy via heat pumps, improving efficiency. Although heat pump design typically favours minimal temperature lifts, higher lifts can be economically viable with low electricity prices and abundant renewables. Adding thermal energy storage boosts operational flexibility. This study explores a flexible heat pump operation incorporating part load behaviour with a thermal energy storage in a German city’s district heating system to minimise costs and carbon dioxide emissions. Using a mixed-integer linear programming model, it examines the impact of temperature adjustments and storage on system efficiency. The results show that the integration of a heat pump in a district heating system reduces operating costs. Compared to a supply without a heat pump, with levelised cost of heating of 9.98 cent/kWhth and a fixed operating mode with costs between 9.96 cent/kWhth and 11.49 cent/kWhth, the flexible use results in lowest costs of 9.85 cent/kWhth, while also reducing overall CO2 emissions. Using a full factorial sensitivity analysis, the levelised cost of heating ranged between 9.15 cent/kWhth in the best case and 10.37 cent/kWhth in the worst case for the selected configuration.}},
  author       = {{Rahlf, Henning Christoph and Divkovic, Denis and Knorr, Lukas and Schlosser, Florian and Meschede, Henning}},
  issn         = {{0196-8904}},
  journal      = {{Energy Conversion and Management}},
  keywords     = {{Heat transition, Optimisation, Temperature flexibility, Decarbonisation, Multi energy}},
  publisher    = {{Elsevier BV}},
  title        = {{{Flexible operation strategies for heat pumps in district heating systems using dynamic electricity prices}}},
  doi          = {{10.1016/j.enconman.2026.121714}},
  volume       = {{364}},
  year         = {{2026}},
}

@article{65476,
  abstract     = {{Service research has evolved into an interdisciplinary research field that bridges diverse disciplines, including information systems (IS) and marketing. Nearly two decades ago, the service system concept was introduced as a foundational abstraction in service research, drawing on ideas from the service-dominant logic (S-D logic) of marketing. Despite its widespread adoption in service research, particularly in the IS discipline, the service system concept lacks a solid theoretical foundation. This has resulted in conceptual ambiguity and overlap with related constructs, such as service ecosystems. Moreover, it has largely remained a static analytical lens, insufficiently capturing dynamic service phenomena, including value co-creation and co-destruction, as well as the emergence of institutional arrangements. To address these limitations, we propose Luhmann’s systems theory (LST) as a robust framework for conceptualizing service systems as autopoietic (self-creating) systems, in which communication serves as the fundamental mechanism that drives value co-creation. We derive five theoretical propositions from this re-conceptualization that clarify conceptual ambiguity and allow researchers to explore dynamic service phenomena in greater depth. Given LST’s general approach, our conceptualization provides a theoretically grounded, interdisciplinary foundation for advancing service research.}},
  author       = {{Beverungen, Daniel and Poeppelbuss, Jens and Hemmrich, Simon and Iqbal, Taskeen}},
  issn         = {{1019-6781}},
  journal      = {{Electronic Markets}},
  keywords     = {{Service system, Service ecosystem, Systems theory, Service research}},
  number       = {{1}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Service through communication—Conceptualizing service systems with Luhmann’s systems theory}}},
  doi          = {{10.1007/s12525-026-00889-w}},
  volume       = {{36}},
  year         = {{2026}},
}

@inproceedings{65901,
  author       = {{Steffens, Hanna and Yigitbas, Enes and Sauer, Stefan}},
  booktitle    = {{Proceedings of the 28th International Conference on Human-Computer Interaction (HCII 2026)}},
  publisher    = {{Springer}},
  title        = {{{Effects of Vertical Price Placement on Consumer Behaviour: A VR-Based Investigation Including Eye Tracking}}},
  year         = {{2026}},
}

@inproceedings{65903,
  author       = {{Seidan, Salah and Yigitbas, Enes and Leichtweiß, Justus}},
  booktitle    = {{Proceedings of the 10th International Conference on Intelligent Computing and Virtual & Augmented Reality Simulations (ICVARS 2026)}},
  publisher    = {{IEEE}},
  title        = {{{Change Your Perspective - A VR Driving Simulator to Enhance Safety Awareness in Public Road Traffic}}},
  year         = {{2026}},
}

@inproceedings{65904,
  author       = {{Krings, Sarah Claudia and Yigitbas, Enes and Sauer, Stefan}},
  booktitle    = {{Proceedings of the 18th ACM SIGCHI Symposium on Engineering Interactive Computing Systems (EICS 2026)}},
  publisher    = {{ACM}},
  title        = {{{A Framework Supporting Context-Awareness for Transitional Cross-Reality Applications}}},
  year         = {{2026}},
}

@article{65905,
  author       = {{Yigitbas, Enes and Dell'Aquila, Alessio}},
  journal      = {{Proceedings of the ACM on Human-Computer Interaction - EICS }},
  publisher    = {{ACM}},
  title        = {{{Exploring the Dynamics of Authoring Interactive VR Environments: Human Collaboration vs. AI Assistance}}},
  year         = {{2026}},
}

@inbook{66437,
  author       = {{Krings, Sarah Claudia}},
  booktitle    = {{Lecture Notes in Computer Science}},
  isbn         = {{9783032260505}},
  issn         = {{0302-9743}},
  publisher    = {{Springer Nature Switzerland}},
  title        = {{{Cross-Reality Context Awareness}}},
  doi          = {{10.1007/978-3-032-26051-2_4}},
  year         = {{2026}},
}

@inproceedings{66687,
  abstract     = {{With a range of consumer devices available, augmented reality (AR) continues to make its way into everyday life and is also increasingly used in professional and sensitive contexts. Especially collaborative use cases, such as remote meetings or maintenance, offer potential, but also move issues in the area of privacy and security into focus. We conducted a scoping review to gain an overview of the current situation and found a lack of clear standards, with most approaches focusing on single protection features. Using the knowledge from the scoping review, we set up and conducted expert interviews. They revealed that end-users are almost completely dependent on developers or device manufacturers regarding their options for protection. The interviews also showed that most developers put little focus on privacy and security, often due to external constraints, such as employers treating the topic as an “afterthought” and not budgeting enough time for it. The experts suggested offering better software support to developers to enable the inclusion of privacy and security with less overhead as a solution. It was also suggested that a general rise in privacy and security awareness could improve the overall situation.}},
  author       = {{Krings, Sarah Claudia and Yigitbas, Enes and Sauer, Stefan}},
  booktitle    = {{Blending Experiences in Interaction Design}},
  editor       = {{Maciel, Cristiano and Spano, Davide Lucio and Ardito, Carmelo and Freire, André and Prates, Raquel}},
  isbn         = {{978-3-032-22934-2}},
  pages        = {{253–276}},
  publisher    = {{Springer Nature Switzerland}},
  title        = {{{Perspectives on Privacy and Security in Collaborative AR - Insights from a Scoping Review and an Expert Interview Study}}},
  year         = {{2026}},
}

@article{66688,
  author       = {{Wüppelmann, Dennis and Yigitbas, Enes}},
  issn         = {{2944-7682}},
  journal      = {{GI - Software Engineering }},
  publisher    = {{Gesellschaft für Informatik, Bonn}},
  title        = {{{SecCityVR: Visualization and Collaborative Exploration of Software Vulnerabilities in Virtual Reality}}},
  doi          = {{10.18420/se2026_53}},
  year         = {{2026}},
}

@inproceedings{67211,
  author       = {{Miller, Thomas and Yigitbas, Enes and Heveling, Robin}},
  booktitle    = {{Proceedings of the 10th International Conference on Computer-Human Interaction Research and Applications (CHIRA)}},
  publisher    = {{Springer}},
  title        = {{{Virtual Reality as a Lens to Examine User Attitudes Toward Autonomous Driving in Realistic Traffic}}},
  year         = {{2026}},
}

@inproceedings{67212,
  author       = {{Kanwischer , Jannes and Yigitbas, Enes}},
  booktitle    = {{Proceedings of the 10th International Conference on Computer-Human Interaction Research and Applications (CHIRA)}},
  publisher    = {{Springer}},
  title        = {{{Exploring the Effects of Controlled Pain Stimuli on User Immersion and Enjoyment in VR Gaming}}},
  year         = {{2026}},
}

@inproceedings{67213,
  author       = {{Ates, Ugur and Yigitbas, Enes}},
  booktitle    = {{Proceedings of the 10th International Conference on Computer-Human Interaction Research and Applications (CHIRA)}},
  publisher    = {{Springer}},
  title        = {{{Learning about Islam Through Virtual Reality: Immersive vs. Non-Immersive Environments}}},
  year         = {{2026}},
}

@inproceedings{67214,
  author       = {{Hamm, Fabian and Yigitbas, Enes}},
  booktitle    = {{Proceedings of the 15th Games and Learning Alliance conference (GALA 2026)}},
  publisher    = {{Springer}},
  title        = {{{A Gamified VR Escape Room for VR Privacy Awareness Education}}},
  year         = {{2026}},
}

@inproceedings{67215,
  author       = {{Mühlenstädt, Dennis and Yigitbas, Enes and Sauer, Stefan}},
  booktitle    = {{Proceedings of the 32nd ACM Symposium on Virtual Reality Software and Technology (VRST)}},
  publisher    = {{ACM}},
  title        = {{{Automated Usability Evaluation in Virtual Reality: A Systematic Mapping Study}}},
  year         = {{2026}},
}

@inproceedings{66610,
  author       = {{Stojko, Laura and Herder, Eelco and Strecker-Bischoff, Jannis and Sänger, Julia Seitz and Neumayr, Thomas and Yigitbas, Enes and Augstein, Mirjam}},
  booktitle    = {{Companion Publication of the 2026 18th ACM Web Science Conference, WebSci Companion 2026, Braunschweig, Germany, May 26-29, 2026}},
  editor       = {{Balke, Wolf-Tilo and Plötzky, Florian and Spaniol, Marc and Herder, Eelco and Manikonda, Lydia and Liu, Haiming and Ibáñez, Luis-Daniel and Rezapour, Rezvaneh}},
  pages        = {{108–109}},
  publisher    = {{ACM}},
  title        = {{{ABIS 2026: The Effects of the Adaptive Web on Society}}},
  doi          = {{10.1145/3795513.3810983}},
  year         = {{2026}},
}

@inproceedings{59835,
  author       = {{Hustermeier, Lennart and Yigitbas, Enes}},
  booktitle    = {{Proceedings of the 20th IFIP TC13 International Conference on Human-Computer Interaction (INTERACT 2025)}},
  publisher    = {{Springer}},
  title        = {{{A Novel Approach for Controlling Drone Swarms: Integrating LLMs and Augmented Reality}}},
  year         = {{2025}},
}

@inproceedings{59833,
  author       = {{Wüppelmann, Dennis and Yigitbas, Enes}},
  booktitle    = {{Proceedings of the 29th International Conference on Evaluation and Assessment in Software Engineering (EASE 2025)}},
  publisher    = {{ACM}},
  title        = {{{SecCityVR: Visualization and Collaborative Exploration of Software Vulnerabilities in Virtual Reality}}},
  year         = {{2025}},
}

@inproceedings{59879,
  author       = {{Wüppelmann, Dennis and Krings, Sarah Claudia and Yigitbas, Enes}},
  booktitle    = {{Proceedings of the 11th International Conference on Virtual Reality (ICVR 2025)}},
  publisher    = {{IEEE}},
  title        = {{{SMART-EAT: Towards Sustainable Nutrition Education and Decision Support using XR}}},
  year         = {{2025}},
}

@inproceedings{61505,
  author       = {{Yigitbas, Enes and Kröker, Leon}},
  booktitle    = {{Proceedings of the 17th International Conference on Ubiquitous Computing and Ambient Intelligence (UCAmI 2025)}},
  publisher    = {{Springer}},
  title        = {{{Bridging the Reality-Virtuality Gap: Evaluating Attention Markers in a Cross-Reality Application for Improved User Coordination}}},
  year         = {{2025}},
}

@inproceedings{61503,
  author       = {{Yigitbas, Enes and Agha, Ali Amin}},
  booktitle    = {{Proceedings of the 17th International Conference on Ubiquitous Computing and Ambient Intelligence (UCAmI 2025) }},
  publisher    = {{Springer}},
  title        = {{{Gamification and Physiological Feedback: A Novel Approach to Reducing Glossophobia in Virtual Reality Environments}}},
  year         = {{2025}},
}