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Univ.Ass. Dipl.-Ing. Dr.techn. Roman Popp ,
Univ.Ass. Dipl.-Ing. Dr.techn. Roman Popp

Kontaktinformation

Telefon:
+43 (1) 58801 38419
E-Mail:
roman.popp@tuwien.ac.at
Raum:
CD0412
TISS:
TISS

Lebenslauf

Roman Popp wurde 1976 in Wien geboren. Er studierte Elektrotechnik mit Fachrichtung Computertechnik an der Technischen Universität Wien. Das Studium beendete er im März 2003 mit ausgezeichnetem Erfolg. Im Dezember 2012 beendete er sein Doktoratsstudium und ist derzeit als Universitätsassisstent am Institut für Computertechnik in den Bereichen "Communication Protocols for SOA" und "User Interfaces" tätig.

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Alle Publikationen

  • E. Arnautovic, H. Kaindl, J. Falb, R. Popp, High-level Models of Software-management Interactions and Tasks for Gradual Transition Towards Autonomic Computing. International Journal On Advances in Intelligent Systems, Bd. 2, 2009, S. 74 - 91.
  • J. Falb, R. Popp, T. Röck, H. Jelinek, E. Arnautovic, H. Kaindl, Fully automatic generation of web user interfaces for multiple devices from a high-level model based on communicative acts. International Journal of Web Engineering and Technology, Bd. 25, Nr. 2, 2009, S. 135 - 161.
  • J. Falb, H. Kaindl, R. Popp, D. Raneburger, Automatiserte Generierung von WIMP-UIs basierend auf Kommunikationsmodellen. i-com, Bd. 3, Nr. 3, 2011, S. 48 - 54.
  • B. Ratzer, A. Weisse, B. Weixelbaumer, N. Mirnig, M. Tscheligi, D. Raneburger, R. Popp, J. Falb, Bringing Gender into Technology: A Case Study in User-Interface-Design and the Perspective of Gender Experts. International Journal of Gender, Science and Technology, Bd. 6, Nr. 1, 2014, S. 3 - 24.
  • J. Falb, R. Popp, T. Röck, H. Jelinek, E. Arnautovic, H. Kaindl, UI Prototyping for Multiple Devices Through Specifying Interaction Design, in Human-Computer Interaction - INTERACT 2007, Proceedings of the 11th IFIP TC 13 International Conference, Part I, LNCS 4662, Springer, 2007, S. 136 - 149.
  • H. Horacek, R. Popp, D. Raneburger, Automated Generation of User Interfaces - A Comparison of Models and Future Prospects, in Human Machine Interaction, Intech Open Access Publisher, 2011, S. 3 - 22.
  • R. Popp, D. Raneburger, A High-Level Agent Interaction Protocol Based on a Communication Ontology, in E-Commerce and Web Technologies Proceedings, Springer-Verlag, Berlin-Heidelberg, 2011, S. 233 - 245.
  • D. Raneburger, R. Popp, S. Kavaldjian, H. Kaindl, J. Falb, Optimized GUI Generation for Small Screens, in Model-Driven Development of Advanced User Interfaces, Springer, 2011, S. 107 - 122.
  • D. Raneburger, D. Alonso-Ríos, R. Popp, H. Kaindl, J. Falb, A User Study with GUIs Tailored for Smartphones, in Proceedings of the 14th IFIP TC 13 International Conference on Human-Computer Interaction - INTERACT 2013, Part II, Springer LNCS 8118, Springer LNCS 8118, 2013, S. 505 - 512.
  • H. Kaindl, R. Popp, R. Hoch, C. Zeidler, Reuse vs. Reusability of Software Supporting Business Processes, in Proceedings of the 15th International Conference on Software Reuse (ICSR 2016), Springer LNCS 9679, 2016, S. 138 - 145.
  • H. Kaindl, T. Rathfux, B. Hulin, R. Beckert, E. Arnautovic, R. Popp, A Core Ontology of Safety Risk Concepts Reconciling Scientific Literature with Standards for Automotive and Railway, in Proceedings of the IFIP WG 13.2/13.5 Joint Working Conference 6th International Conference on Human-Centered Software Engineering, HCSE 2016 and 8th International Conference on Human Error, Safety, and System Development, HESSD 2016, Human-Centered and Error-Resilient Systems Development, Springer LNCS 9856, 2016, S. 165 - 180.
  • R. Liebhart, J. Falb, W. Radinger, R. Popp, K. Göschka, Mobile Voice Over IP Communication Using Mobile Software Agents, in Proceedings of the TCMC2001 auf CD Rom, 2001, S. 1.
  • J. Falb, R. Popp, T. Röck, H. Jelinek, E. Arnautovic, H. Kaindl, Using Communicative Acts in High-Level Specifications of User Interfaces for Their Automatic Synthesis, in Proceedings of the 20th IEEE/ACM International Conference on Automated Software Engineering, 2005, S. 429 - 430.
  • H. Kaindl, J. Falb, E. Arnautovic, R. Popp, High-level Communication in Systems-of-Systems, in Proceedings of the Fourth Annual Conference on Systems Engineering Research (CSER-06), S. 10, Los Angeles, California, USA, 2006.
  • J. Falb, H. Kaindl, H. Horacek, C. Bogdan, R. Popp, E. Arnautovic, A discourse model for interaction design based on theories of human communication, in CHI `06 Extended Abstracts on Human Factors in Computing Systems, 2006, S. 754 - 759.
  • J. Falb, R. Popp, T. Röck, H. Jelinek, E. Arnautovic, H. Kaindl, Using communicative acts in interface design specifications for automated synthesis of user interfaces, in Proceedings of the 21st IEEE/ACM International Conference on Automated Software Engineering, 2006, S. 261 - 264.
  • J. Falb, R. Popp, T. Röck, H. Jelinek, E. Arnautovic, H. Kaindl, Fully-automatic generation of user interface for multiple devices from a high-level model based on communicative acts, in Proceedings of the Fortieth Annual Hawaii International Conference on System Sciences (HICSS-40), S. 10, Hawaii, 2007.
  • E. Arnautovic, H. Kaindl, J. Falb, R. Popp, A. Szep, Gradual transition towards autonomic software systems based on high-level communication specification, in Proceedings of the 2007 ACM Symposium on Applied Computing (SAC 07), 2007, S. 84 - 89.
  • C. Bogdan, J. Falb, H. Kaindl, S. Kavaldjian, R. Popp, H. Horacek, E. Arnautovic, A. Szep, Generating an Abstract User Interface from a Discourse Model Inspired by Human Communication, in Proceedings of the 41st Hawaii International Conference on System Sciences, S. 10, Waikoloa, Big Island, Hawaii, 2008.
  • C. Bogdan, H. Kaindl, J. Falb, R. Popp, Modeling of interaction design by end users through discourse modeling, in Proceedings of the 2008 ACM International Conference on Intelligent User Interfaces (IUI 2008), 2008, S. 305 - 308.
  • E. Arnautovic, H. Kaindl, J. Falb, R. Popp, High-level modeling of software-management interactions and tasks for autonomic computing, in Proceedings of the Fourth International Conference on Autonomic and Autonomous Systems (ICAS 2008), 2008, S. 212 - 218.
  • R. Popp, J. Falb, E. Arnautovic, H. Kaindl, S. Kavaldjian, D. Ertl, H. Horacek, C. Bogdan, Automatic Generation of the Behavior of a User Interface from a High-level Discourse Model, in Proceedings of the 42nd Hawaii International Conference on System Sciences (HICSS 2009), S. 10, Hawaii, 2009.
  • J. Falb, S. Kavaldjian, R. Popp, D. Raneburger, E. Arnautovic, H. Kaindl, Fully automatic user interface generation from discourse models, in Proceedings of the 13th international conference on Intelligent user interfaces, 2009, S. 475 - 476.
  • R. Popp, Defining communication in SOA based on discourse models, in Proceeding of the 24th ACM SIGPLAN conference companion on Object oriented programming systems languages and applications, S. 2, Orlando, Florida, USA, 2009.
  • D. Ertl, R. Popp, M. Vallee, Key Disciplines in Multimodal User Interface Development with Interaction Design, in Proceedings of the "The 4th IASTED International Symposium on Human-Computer Interaction", S. 8, St. Thomas, Virgin Islands, 2009.
  • S. Kavaldjian, D. Raneburger, R. Popp, M. Leitner, J. Falb, H. Kaindl, Automated Optimization of User Interfaces for Screens with Limited Resolution, in Proceedings of the 5th International Workshop on Model Driven Development of Advanced User Interfaces (MDDAUI 2010): Bridging between User Experience and UI Engineering, S. 4, Atlanta, 2010.
  • H. Kaindl, R. Popp, D. Raneburger, D. Ertl, J. Falb, A. Szep, C. Bogdan, Robot-Supported CooperativeWork: A Shared-Shopping Scenario, in Proceedings of the 44th Hawaii International Conference on System Sciences (HICSS 2011), 2011, S. 1530 - 1605.
  • D. Ertl, H. Kaindl, E. Arnautovic, J. Falb, R. Popp, Generating High-Level Interaction Models out of Ontologies, in Proceedings of 2nd Workshop of Semantic Models for Adaptive Interactive Systems, S. 2, Palo Alto, CA, US, 2011.
  • D. Ertl, H. Kaindl, E. Arnautovic, J. Falb, R. Popp, Discourse-based Interaction Models for Recommendation Processes, in Proceedings of the Fourth International Conference on Advances in Computer-Human Interactions, S. 4, Gosier, Guadeloup, France, 2011.
  • D. Raneburger, R. Popp, H. Kaindl, J. Falb, D. Ertl, Automated Generation of Device-Specific WIMP-UIs: Weaving of Structural and Behavioral Models, in Proceedings of the 2011 SIGCHI Symposium on Engineering Interactive Computing Systems, 2011, S. 41 - 46.
  • D. Raneburger, R. Popp, H. Kaindl, J. Falb, Automated WIMP-UI Behavior Generation: Parallelism and Granularity of Communication Units, in Proceedings of the 2011 IEEE International Conference on Systems, Man and Cybernetics, 2011, S. 2816 - 2821.
  • R. Popp, J. Falb, D. Raneburger, H. Kaindl: A Transformation Engine for Model-driven UI Generation. in Proceedings of the 4th ACM SIGCHI Symposium on Engineering Interactive Computing Sytems (EICS´12), S. 6, Copenhagen, Denmark, 2012.
  • D. Raneburger, R. Popp, J. Vanderndonckt, An Automated Layout Approach for Model-Driven WIMP-UI Generation, in Proceedings of the 4th ACM SIGCHI Symposium on Engineering Interactive Computing Systems, EICS'12, S. 10, Copenhagen, Denmark, 2012.
  • H. Kaindl, R. Popp, D. Raneburger, Automated Generation of User Interfaces: Based on Use Case or Interaction Design Specifications?, in Proceedings of the 7th International Conference on Software Paradigm Trends (ICSOFT´12), 2012, S. 1 - 6.
  • D. Ertl, J. Falb, H. Kaindl, R. Popp, D. Raneburger, Expectation-Based Command Recognition Off the Shelf: Publicly Reproducible Experiments with Speech Input, in Proceedings of the 46th Annual Hawaii International Conference on System Sciences, 2013, S. 407 - 416.
  • H. Kaindl, E. Wach, A. Okoli, R. Popp, R. Hoch, W. Gaulke, T. Hussein, Semi-automatic Generation of RecommendationProcesses and their GUIs, in IUI '13 Proceedings of the 2013 international conference on Intelligent user interfaces, S. 10, Santa Monica, CA, USA, 2013.
  • R. Popp, D. Raneburger, H. Kaindl, Tool Support for Automated Multi-device GUI Generationfrom Discourse-based Communication Models, in Proceedings of the ACM SIGCHI Symposium on Engineering Interactive Computing Systems, EICS'13, S. 6, London, United Kingdom, 2013.
  • D. Raneburger, R. Popp, H. Kaindl, Model-driven Transformation for Optimizing PSMs A Case Study of Rule Design for Multi-device GUI Generation, in Proceedings of the 8th International Joint Conference on Software Technologies, 2013, S. 496 - 503.
  • D. Raneburger, R. Popp, J. Falb, B. Weixelbaumer, N. Mirnig, A. Weiss, M. Tscheligi, B. Ratzer, A Case Study in Automated GUI Generation for Multiple Devices, in Proceedings of the 11th IEEE AFRICON Conference, S. 6, Mauritius, 2013.
  • D. Raneburger, R. Popp, H. Kaindl, Design Alternatives for GUI Development with Discourse-based Communication Models, in Informatik 2013, S. 13, Koblenz, Deutschland, 2013.
  • D. Raneburger, R. Popp, D. Alonso-Ríos, H. Kaindl, J. Falb, A User Study with GUIs Tailored for Smartphones and Tablet PCs, in Proceedings of the 2013 IEEE International Conference on Systems, Man and Cybernetics (SMC'13), 2013, S. 3727 - 3732.
  • R. Popp, H. Kaindl, D. Raneburger, Connecting Interaction Models and Application Logic for Model-driven Generation of Web-based Graphical User Interfaces, in Proceedings of the 20th Asia-Pacific Software Engineering Conference (APSEC 2013), 2013, S. 215 - 222.
  • D. Alonso-Ríos, D. Raneburger, R. Popp, H. Kaindl, J. Falb, A User Study on Tailoring GUIs for Smartphones, in Proceedings of the 29th Annual ACM Symposium on Applied Computing, 2014, S. 186 - 192.
  • D. Raneburger, H. Kaindl, R. Popp, V. Sajatovic, A. Armbruster, A Process for Facilitating Interaction Design through Automated GUI Generation, in Proceedings of the 29th Annual ACM Symposium on Applied Computing, 2014, S. 1324 - 1330.
  • C. Gutschier, R. Hoch, H. Kaindl, R. Popp, A Pitfall with BPMN Execution, in Proceedings of the second International Conference on Building and Exploring Web Based Environments WEB 2014, S. 7, Chamonix, France, 2014.
  • R. Popp, H. Kaindl, Automated Adaptation of Business Process Models Through Model TransformationsSpecifying Business Rules, in Proceedings of the CAiSE'14 Forum at the 26th International Conference on Advanced Information Systems Engineering (CAiSE), 2014, S. .
  • D. Raneburger, R. Popp, H. Kaindl, A. Armbruster, V. Sajatovic, An Iterative and Incremental Process for Interaction Designthrough Automated GUI Generation, in Proceedings of the 16th International ConferenceHCI International 2014, Part I, S. 12, Heraklion, Crete, Greece, 2014.
  • H. Kaindl, R. Popp, D. Raneburger, Alternative Interaction Design Patterns for Automated GUI Generation from Discourse-based Communication Models, in Proceedings of the 2014 IEEE International Conference on Systems, Man, and Cybernetics, SMC 2014, 2014, S. 2169 - 2172.
  • R. Popp, H. Kaindl, S. Badalians Gholi Kandi, D. Raneburger, F. Paterno, Duality of Task- and Discourse-based Interaction Design for GUI Generation, in Proceedings of the 2014 IEEE International Conference on Systems, Man, and Cybernetics, SMC 2014, 2014, S. 3323 - 3328.
  • R. Hoch, H. Kaindl, R. Popp, D. Ertl, H. Horacek, Semantic Service Specification for V&V of Service Composition and Business Processes, in Proceedings of the 48th Hawaii International Conference on System Sciences (HICSS-48), 2015, S. 1370 - 1379.
  • D. Raneburger, H. Kaindl, R. Popp, Strategies for Automated GUI Tailoring for Multiple Devices, in Proceedings of the 48th Hawaii International Conference on System Sciences (HICSS-48), 2015, S. 507 - 516.
  • R. Hoch, H. Kaindl, R. Popp, D. Ertl, Comprehensive Integration of Executable Business Process Models with Semantic Concept and Task Specifications, in Proceedings of the Fifth International Conference on Business Intelligence and Technology (BUSTECH 2015), S. 5, Nice, France, 2015.
  • R. Popp, H. Kaindl, Automated Refinement of Business Processes through Model Transformations Specifying Business Rules, in Proceedings of the IEEE 9th International Conference on Research Challenges in Information Science (RCIS 2015), 2015, S. 359 - 365.
  • D. Raneburger, H. Kaindl, R. Popp, Model Transformation Rules for Customization of Multi-device Graphical User Interfaces, in Proceedings of the 7th ACM SIGCHI Symposium on Engineering Interactive Computing Systems, 2015, S. 100 - 109.
  • H. Kaindl, R. Popp, D. Raneburger, Towards Reuse in Safety Risk Analysis Based on Product Line Requirements, in Proceedings of RE 2015 Conference Events, 2015, S. 241 - 246.
  • M. Rathmair, R. Hoch, H. Kaindl, R. Popp, Consistently Formalizing a Business Process and its Properties for Verification: A Case Study, in Proceedings of the Practice of Enterprise Modeling 8th IFIP WG 8.1. Working Conference (PoEM 2015), 2015, S. 126 - 140.
  • R. Hoch, H. Kaindl, R. Popp, C. Zeidler, Aligning Architectures of Business and Software: Software Driven by Business Process Models and its User Interface, in Proceedings of the 49th Hawaii International Conference on System Sciences, S. 8, Kauai, Hawaii, 2016.
  • R. Hoch, M. Rathmair, H. Kaindl, R. Popp, Verification of Business Processes Against Business Rules Using Object Life Cycles, in Advances in Intelligent Systems and Computing Proceedings of the 4th World Conference on Information Systems and Technologies (WorldCist 2016), 2016, S. 589 - 598.
  • T. Rathfux, R. Popp, H. Kaindl, Adding Custom Widgets to Model-driven GUI Generation, in Proceedings of the 8th ACM SIGCHI Symposium on Engineering Interactive Computing Systems, S. 11, Brüssel, Belgien, 2016.
  • B. Hulin, H. Kaindl, T. Rathfux, R. Popp, E. Arnautovic, R. Beckert, Towards a Common Safety Ontology for Automobiles and Railway Vehicles, in Proceedings of the 12th European Dependable Computing Conference (EDCC 2016), 2016, S. 189 - 196.
  • R. Popp, R. Hoch, H. Kaindl, A Connection of Task-centric with Artefact-centric Models through Semantic Task Specification and its Use for Formal Verification, in Proceedings of the 50th Hawaii International Conference on System Sciences 2017, 2017, S. 4817 - 4826.
  • R. Popp, H. Kaindl, Stateful SOA-conformant Services as Building Blocks for Interactive Software Systems, in Proceedings of the 50th Hawaii International Conference on System Sciences 2017, 2017, S. 1257 - 1266.
  • H. Kaindl, R. Hoch, R. Popp, Semantic Task Specification in Business Process Context, in Proceedings of the 11th IEEE International Conference on Research Challenges in Information Science RCIS 2017, 2017, S. 286 - 291.
  • A. Anjorin, E. Yigitbas, H. Kaindl, R. Popp, On the Development of Consistent User Interfaces, in Programming'18 Companion Conference Companion of the 2nd International Conference on Art, Science, and Engineering of Programming, 2018, S. 18 - 20.
  • T. Rathfux, Thöner, H. Kaindl, R. Popp, Combining Design-time Generation of Web-pages with Responsive Design for Improving Low-vision Accessibility, in Proceedings of the ACM SIGCHI Symposium on Engineering Interactive Computing Systems, S. 7, Paris, 2018.
  • B. Hulin, H. Kaindl, R. Beckert, T. Rathfux, R. Popp, Towards a Common Ontology of Safety Risk Concepts for Railway Vehicles and Signaling, in Computer Safety, Reliability, and Security 37th International Conference, SAFECOMP 2018, 2018, S. 297 - 310.
  • R. Popp, A Unified Solution for Service-oriented Architecture and User Interface Generation through Discourse-based Communication Models, Supervisor: H. Kaindl, O. Pastor, E384, 2012.
  • E. Arnautovic, C. Bogdan, J. Falb, H. Kaindl, R. Popp, Dealing with Context within an Ontology-based Unified Communication Platform, tech. report, Institute of Computer Technology, Vienna University of Technology, for: FFG, FIT-IT, Projektnr. 809254/9312, 2005.
  • E. Arnautovic, C. Bogdan, J. Falb, H. Kaindl, R. Popp, Language Specification for Communicative Acts, tech. report, Institute of Computer Technology, Vienna University of Technology, for: FFG, FIT-IT, Projektnr. 809254/9312, 2005.
  • E. Arnautovic, C. Bogdan, J. Falb, H. Horacek, H. Kaindl, S. Kavaldjian, R. Popp, T. Röck, Complete Specification of the Communication Description Language (CDL), tech. report, Institute of Computer Technology, Vienna University of Technology, for: FFG, FIT-IT, Projektnr. 809254/9312, 2006.
  • E. Arnautovic, C. Bogdan, J. Falb, H. Horacek, H. Kaindl, S. Kavaldjian, R. Popp, T. Röck, Language Specification of Episodes, tech. report, Institute of Computer Technology, Vienna University of Technology, for: FFG, FIT-IT, Projektnr. 809254/9312, 2006.
  • E. Arnautovic, J. Falb, H. Kaindl, S. Kavaldjian, R. Popp, A. Szep, Communication Process Specification (Episode Engine Specification), tech. report, Institute of Computer Technology, Vienna University of Technology, for: FFG, FIT-IT, Projektnr. 809254/9312, 2006.
  • E. Arnautovic, J. Falb, H. Kaindl, S. Kavaldjian, R. Popp, A. Szep, Transport Mechanism Specification, tech. report, Institute of Computer Technology, Vienna University of Technology, for: FFG, FIT-IT, Projektnr. 809254/9312, 2006.
  • C. Bogdan, E. Arnautovic, J. Falb, H. Kaindl, R. Popp, A. Szep, S. Kavaldjian, User Interface Rendering Specification Structural Part, tech. report, Institute of Computer Technology, Vienna University of Technology, for: FFG, FIT-IT, Projektnr. 809254/9312, 2006.
  • E. Arnautovic, C. Bogdan, J. Falb, H. Kaindl, S. Kavaldjian, R. Popp, A. Szep, Information System Application Design Document, tech. report, Institute of Computer Technology, Vienna University of Technology, for: FFG, FIT-IT, Projektnr. 809254/9312, 2007.
  • E. Arnautovic, C. Bogdan, J. Falb, H. Kaindl, S. Kavaldjian, R. Popp, A. Szep, User Interface Rendering Specification IO Rendering, tech. report, Institute of Computer Technology, Vienna University of Technology, for: FFG, FIT-IT, Projektnr. 809254/9312, 2007.
  • E. Arnautovic, J. Falb, H. Kaindl, R. Popp, A. Szep, Information System Application Design Document, tech. report, Institute of Computer Technology, Vienna University of Technology, for: FFG, FIT-IT, Projektnr. 809254/9312, 2007.
  • D. Bildhauer, J. Ebert, V. Riediger, K. Wolter, M. Nick, A. Jedlitschka, S. Weber, H. Schwarz, A. Ambroziewicz, J. Bojarski, T. Straszak, S. Kavaldjian, R. Popp, A. Szep, Software Case Marking Language Definition, tech. report, Institute of Computer Technology, Vienna University of Technology, for: EU, ReDSeeDS, Projektnr. IST-2006-033596, 2007.
  • A. Kalnins, A. Sostaks, E. Celms, E. Kalnina, A. Ambroziewicz, J. Bojarski, W. Nowakowski, T. Straszak, V. Riediger, H. Schwarz, D. Bildhauer, S. Kavaldjian, R. Popp, J. Falb, Reuse-Oriented Modelling and Transformation Language Definition, tech. report, Institute of Computer Technology, Vienna University of Technology, for: EU, ReDSeeDS, Projektnr. IST-2006-033596, 2007.
  • H. Kaindl, J. Falb, E. Arnautovic, R. Popp, User and System Requirements Specification Second Baseline, tech. report, Institute of Computer Technology, Vienna University of Technology, 2008.
  • H. Kaindl, J. Falb, E. Arnautovic, A. Szep, R. Popp, D2.1 First Version of System, Architectural and Subsystem Specification, tech. report, Institute of Computer Technology, Vienna University of Technology, 2008.
  • H. Kaindl, J. Falb, E. Arnautovic, A. Szep, R. Popp, D2.1 V2 Annex 1 - User and System Requirements Specification Third Baseline, tech. report, Institute of Computer Technology, Vienna University of Technology, 2008.
  • H. Kaindl, J. Falb, E. Arnautovic, A. Szep, R. Popp, D2.1 V2 Sytem, Architectural and Subsystem Specification, tech. report, Institute of Computer Technology, Vienna University of Technology, 2008.
  • H. Kaindl, J. Falb, D. Ertl, A. Szep, R. Popp, D5.2 - Requirements Definition of Communication Platform, tech. report, Institute of Computer Technology, Vienna University of Technology, 2008.
  • H. Kaindl, J. Falb, H. Horacek, E. Arnautovic, R. Popp, D5.1 - Report on the Communication Model, tech. report, Institute of Computer Technology, Vienna University of Technology, 2008.