Dr. rer. nat. Sascha Alda

Diplom Informatiker (M.Sc.)
Institute of Computer Science III
University of Bonn

alda@cs.uni-bonn.de

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Welcome

Thank you for visiting my private Homepage! The purpose of this page is to give you both a short survey of my research work as well as a private background of my person. Since June 2001, I work as a research associate at the Institute for Computer Science III, University of Bonn in Germany. In this Institute, I am a member of ProSEC, a working group mainly doing research in the field of Computer Suppored Cooperative Work (CSCW) and Human Computer Interaction (HCI). For the last years, I have been responsible for the CoBE project, which is funded by the Deutsche Forschungsgemeinschaft (DFG) in the course of a joint research program. This projects evalutes the requirements of software architectures for enhancing the collaboration of planing processes in civil and building engineering projects. The preparation of my Ph.D. thesis (dissertation) is an another part of my work. In this work, I analyse both problems and requirements of adaptability in distributed peer-to-peer architectures. Watch out the Research section for a more elaborated overview of my research interests.

Before I started working in the scientific field, I worked at the IBM Lab in Böblingen, where I was a member of the Websphere Portal Server Project. From this time, I have "inherited" my interest in the field of Pervasive Computing.

I studied Computer Science and Economics (Wirtschaftsinformatik) at the Universities of Koblenz (Germany) and Leiden (The Netherlands).

However, besides my life in the research community, I am also engaged to hold up my social life and network. Do not hesitate to visit my Private Stuff section to see that a computer scientist can also have a normal (and sometimes quit exciting) private life!

Thank you very much indeed once more for visiting my page! Feel free to contact me if you should have any comments on this page.

Best regards and enjoy the following pages!

Best regards

Sascha Alda

Research

Generally, I am interested in software engineering especially in the field of distributed systems. The following list summarizes my current research topics more precisely:

  • Peer-To-Peer (P2P) Architectures This field of research is relatively young, though P2P architectures have been applied to many systems in recent decades, for instance like the well-known Domain Name Service (DNS) of the Internet. The renewed interest in this field can be attributed to the enourmous success of applications like Napster or Gnutella. While some researchers assess P2P only as yet another buzz word of the Internet, some people are convinced to consider P2P as a major contributor to overcome the conventional and in some way strict client-server pardigma. As a part of my research, I try to investigate to what extend P2P architectures can be adopted to large-scaled, distributed systems with high requirements concerning data consistency and integrity, security, availability and scalability. So far, less effort has been made to sufficiently face these problems. For this purpose, I study current P2P implementations e.g. JXTA from Sun, which is an open-source project providing a framework for P2P architectures. Besides, I will explore key strategies in order to guarantee data integrity and redundancy. Redundancy is actually the unique solution for provding data availbility in P2P architectures.

    Other contributers or working groups dealing with P2P, which are worth mentioning here are e.g.:


    The results of this work will (hopefully) influence the progress of my current project CoBE. In this project, a platform is to be designed and finally implemented in order improve cooperative work and dynamic communication of projects in the field of civil and building engineering. This project is founded by the "Deutsche Forschungsgemeinschaft (DFG)".
  • Computer Supported Cooperative Work (CSCW)
  • Agent-based software development and agent systems
  • Component Technology
  • Webservices
Other interests, which are no direct research items:
  • Object-oriented modeling and programming
  • Pervasive and Ubiqioutous Computing
  • Meta Modelling
  • CASE Tools
  • Linux
Furthermore, I am interested in following open-source projects:
  • Jetspeed Jetspeed is a open-source portal framework from the Apache working group. As a part of my work at IBM, I was envolved in the development of this project. Jetspeed serves as the basic framework of the Websphere Portal Server. One of the crucial characteristics of Jetspeed is the multidevice capability, that is, it is possible to access the portal with various devices such as PDA, or mobile phones.
  • Avalon
  • JXTA

Teaching

WS 2002/2003
  • Seminar Middleware- and XML-Technologies (Info)
    (togther with Prof. Armin B. Cremers, Dr. Stefan Lüttringhaus-Kappel, and Uwe Radetzki)

SS 2005

  • Lecture Object-Oriented Software Construction (Info)
    (given at the B-IT, course in english language,
    togther with Prof. Armin B. Cremers, and Tobias Rho)
  • Exercise Object-Oriented Software Construction (Info)
    (given at the B-IT, course in english language,
    togther with Tobias Rho)
WS 2005/2006
  • Lecture Organizational Requirements Engineering (Info)
    (given at the B-IT, course in english language,
    togther with Prof. Armin B. Cremers)
  • Exercise Organizational Requirements Engineering (Info)
    (given at the B-IT, course in english language,
    togther with Tobias Rho, Daniel Speicher)
  • Seminar Service-oriented Software System Engineering (Info)
    (togther with Prof. Armin B. Cremers)
SS 2006
  • Lecture Object-Oriented Software Construction (Info)
    (given at the B-IT, course in english language,
    togther with Prof. Armin B. Cremers, and Tobias Rho)
  • Exercise Object-Oriented Software Construction (Info)
    (given at the B-IT, course in english language,
    togther with Tobias Rho, Daniel Speicher)
  • Praktikum Service-Integration in Web Portalen (Info)
    (togther with Julia Kuck)

Publications and Talks

2007

Published Papers

  • Alda, S., Kuck, J., Cremers, A.B.: "Tailorability of personalized BPEL-based Workflow Compositions", in: Proceedings of 1st International Workshop on Web Service Composition and Adaptation (WSCA-2007) held in conjunction with 5th International Conference on Web Services (ICWS-2007). IEEE Publishing. Salt Lake City, USA. 2007.
Reports (Book Section)
  • Cremers, A.B., Alda, S., Komponentenbasierte Plattform für anpassbare, vernetzte Systeme im Bauwesen, in: Rüppel, U.: "Vernetzt-kooperative Planungsprozesse im Konstruktiven Ingenieurbau. Grundlagen, Methoden, Anwendungen und Perspektiven zur vernetzten Ingenieurkooperation. Springer-Verlag Berlin. 2007.
2006

Dissertation

  • Alda, S.: "Component-based Adaptation Methods for Service-oriented Peer-to-Peer Architectures". Dissertation, Institut für Informatik III, Universität Bonn. Bonn, Germany 2006. (.pdf)
Published Papers
  • Alda, S., Cremers, A.B.: "The DeEvolve Platform: Ensuring the consistency between dispersed planning activities in structural design projects", in: Proceedings of the 11th International Conference on Computing in Civil and Building Engineering (ICCCBE-XI). Montreal, Canada. June 2006.
  • Alda, S., Bilek, J., Cremers, A.B., and Hartmann, D.: "Awareness and workflow based coordination of networked co-operations in structural design", in: Journal of Information Technology in construction (ITCon), Special Issue Process Modelling, Process Management and Collaboration. July 2006. pg. 489-507. (.pdf)
2005

Published Papers

  • Alda, S.: "Peer Group-Based Dependency Management in Service-Oriented Peer-to-Peer Architectures", to appear in: Proceedings of the Third International Workshop On Databases, Information Systems and Peer-to-Peer Computing (DBISP2P), in conjunction with 31st International Conference on Very Large Data Bases (VLDB). LNCS Proceedings. Trondheim, Norway. September 2005. .pdf
  • Cremers, A.B., Alda, S. Radetzki, U.: "Towards Semantic Grid in Construction Informatics", in: Proceedings of the 22nd International Conference Information Technology in Construction (CIB-W78) (Invited Keynote Paper). Dresden, Germany. Juli 2005. .pdf
  • Alda, S. Cremers, A.B., Bilek, J., and Hartmann, D.: "Integrated Multiagent and Peer-to-Peer based Workflow-Control of Dynamic Networked Co-operations in Structural Design", in: Proceedings of the 22nd International Conference Information Technology in Construction (CIB-W78). Dresden, Germany. Juli 2005. .pdf
  • Alda, S., Won, M., Cremers, A.B.: "Group-Oriented Learning of Object-Oriented Software Methods in Construction Engineering: A Case for GeoCafe", in: Proceedings of 4th Workshop Construction Information Technology in Education. Dresden, Germany. Juli 2005. .pdf
  • Gnasa, M. Alda, S., Gül, N., and Cremers, A.B.: "Personalized Peer Filtering for a Dynamic Information Push", in: Proceedings of the 15th International Symposium on Methodologies for Intelligent Systems Saratoga Springs, New York. To appear in: LNAI, Springer. New York, USA. 2005. .pdf
2004

Published Papers

  • Alda, S., Mitrov, T., and Palij, A.: "Semantic Integrity Concepts for Service-Oriented Peer-to-Peer Architectures", in: Proceedings of the 2nd IST Workshop on Metadata Management in Grid and P2P Systems (MMGPS). To appear in: LNCS, Springer. London, England. December 2004. (.pdf )
  • Gnasa, M.; Alda, S.; Guel, N.; Grigull, J.; Cremers, A.B.: "Cooperative Pull-Push-Cycle for searching a hybrid P2P network", in: Proceedings of the 4th IEEE International Conference on Peer-to-Peer Computing (P2P2004), pp. 192-199. ETH Zuerich, Switzerland. August 2004. (.pdf )
  • Alda, S. Cremers, A.B., Bilek, J., and Hartmann, D.: "Support of Collaborative Structural Design Processes through the Integration of Peer-to-Peer and Multiagent Architectures", in: Proceedings of the 10th International Conference on Computing in Civil and Building Engineering (ICCCBE-X). Weimar, Germany. Juni 2004. (.pdf )
  • Alda, S.: "Component-based Self-Adaptability in Peer-to-Peer Architectures", in: Proceedings of the 26th International Conference on Software Engineering (ICSE 2004), pp. 33-35. Contribution for the Doctoral Symposium. Edinburgh, Scotland. May, 2004. (.pdf )
  • Alda, S. and Cremers, A.B.: "Strategies for Component-based Self-Adaptability Model in Peer-to-Peer Architectures", in: Proceedings of the 4th International Symposium on Component-based Software Engineering (CBSE7). LNCS 3054, Springer, pp. 59-67. Edinburgh, Scotland. May, 2004. (.pdf )
  • Alda, S. and Cremers, A.B.: "Towards Composition Management for Peer-to-Peer Architectures", in: Proceedings of the Workshop Software Composition (SC 2004), affiliated to the 7th European Joint Conference on Theory and Practice of Software (ETAPS 2004), pp.42-58. Barcelona, Spain. April 2004. (.pdf )
Reports
  • Cremers, A.B., Alda, S., Komponentenbasierte Plattform für anpassbare, vernetzte Systeme im Bauwesen. Zwischenbericht über die 2. Phase im Rahmen des DFG-Schwerpunktprogramms SPP 1103. Bonn, Germany, Mai 2004. (.pdf)
Other Contributions
  • Alda, S. and Cremers, A.B.: "Project CoBE: Supporting the Collaboration of Planning Processes through a Component-based Peer-to-Peer Architecture", in: Begleitband des 1. Internationalen Symposiums für Bauinformatik (BIS) in Moskau und St. Petersburg . Darmstadt, Moskau, St. Petersburg. September 2004. (.pdf )
2003

Published Papers

  • Gnasa, M., Alda, S., Grilgull, J., Cremers, A.B.: "Towards Virtual Knowledge Communities in Peer-to-Peer Networks", in: Proceeding of the SIGIR Workshop on Distributed Information Retrieval. Workshop at the 26th International ACM SIGIR Conference. LNCS 2974, Springer, pp. 143-155. Toronto, Canada. August 2003. (.pdf )
  • Alda, S., Cremers, A.B., Meißner, U.F., Rüppel, U., Theiß, M., "Wahrnehmung und Verarbeitung von Ereignissen bei der verteilten Planung im baulichen Brandschutz", in: Proceeding des 16. Internationalen Kolloquiums über Anwendungen der Informatik und Mathematik in Architektur und Bauwesen. IKM 2003. Weimar, Germany. Juni 2003. (.pdf )
  • Alda, S., Cremers, A.B.: "Collaborative Support for Planning Processes through Component-Based Peer Services", accepted for: 10th International Conference for Concurrent Engineering (CE 2003). Madeira, Portugal. July 2003. (.pdf )
Accepted Papers
  • Alda, S., Theiß, M., Cremers, A.B., Meißner, U.F., Rüppel, U., "Holistic Support for the Collaborative Planning of Fire Prevention Concepts in Building Design", accepted for: 16th International Conference on the Application of Computer Science and Mathematics in Architecture and Civil Engineering. Weimar, Germany. June 2003.
Drafts
  • Alda, S.: End-User Supported Self-Adaptability in Component-Based Peer-to-Peer Architectures. Draft for Doctoral Thesis. University of Bonn, Germany. July 2003. (.pdf )
2002

Published Papers

  • Alda, S., Won, M., Cremers, A.B., "Managing Dependencies in Component-Based Distributed Applications", in: Proceedings of International Workshop on Scientific Engineering of Distributed Java Applications (FIDJI'2002). LNCS 2604, Springer, pp. 143-154. Luxembourg-City, Luxembourg. November 2002. (.pdf )
  • Alda, S., "Adaptability in Component-Based Peer-to-Peer Applications", in: Proceedings of the IEEE International Conference on Peer-to-Peer Computing (P2P2002), pp. 163-164. Linköpings, Schweden. September 2002. (Short Paper) (Short version: .pdf, Extended (unpublished) version: .pdf, Poster: .pdf )
  • Alda, S., "Agentenbasiertes Modell zur Geschehens- und Zustandswahrnehmung im Bauwesen", in: Ergebnisband zum 14. Forum Bauinformatik der Universität Bochum, pp. 132-139. Bochum, Germany. September 2002. (.pdf)
  • Radetzki, U., Alda, S., Bode, T. and Cremers, A.B., "First Steps in the Development of a Web Service Framework for Heterogeneous Environmental Information Systems", in: Proceedings of the 16th International Symposium Environmental Informatics (EnviroInfo), pp. 384-391. Vienna, Austria. September 2002. (.pdf)
  • Alda, S., Radetzki, U., Won, M., Cremers, A.B., "Eine anpassbare, komponentbasierte Plattform für vernetzte Kooperationen im Bauwesen". Ergebnisband zur Tagung Bauen mit Computern der VDI, pp. 351-370. Bonn, Germany. April 2002.
  • Alda, S., Radetzki, U., Bergmann, A., Cremers, A.B., "A Component-Based and Adaptable Platform for Networked Cooperations in Civil and Builidng Engineering", in: Proceedings of the 9th International Conference on Computing in Civil and Building Engineering (ICCCBE-IX), pp. 1031-1038. Taipei, Taiwan. April 2002 (.ps, .pdf)
Reports
  • Cremers, A.B., Alda, S., Komponentenbasierte Plattform für anpassbare, vernetzte Systeme im Bauwesen. Zwischenbericht über die 1. Phase im Rahmen des DFG-Schwerpunktprogramms SPP 1103. Bonn, Germany, Mai 2002. (.pdf)
2001

Talks

  • Alda, Sascha: "Komponentenbasierte Plattform für anpassbare, vernetzte Systeme im Bauwesen". Vortrag im Rahmen des Wissenschaftstreffen 2001 der Deutschen Forschungsgemeinschaft (DFG). Berlin, Germany, September 2001. (Powerpoint)
  • Alda, Sascha: "Agenten, Objekte, Komponenten - ein Paradigma-Vergleich". Vortrag im Workshop "Einführung in die Agententechnologie" im Rahmen des 13. Forum Bauinformatik der TU München. München, Germany, Oktober 2001. (Powerpoint)
Master Thesis (Diplomarbeit)

  • Alda, Sascha: "Entwurf und Implementierung einer Software Plattform zur generischen Datenvisualisierung im Software Monitoring". Master Thesis, University of Koblenz, 2000.
Project Thesis (Studienarbeit)

  • Alda, Sascha: "Evolutionary Change within SOCCA: A simulation approach". Project Thesis, University of Leiden, University of Koblenz, 1998.

Collegues

Tobias Rho
  • Research Associate at the Institute of Computer Science III
  • Member of the CSI project, Lecturer at B-IT"
rho 'at' cs.uni-bonn.de
http://goepffarth.de/

Contact

Office : Dipl.-Inform. Sascha Alda
Institute of Computer Science III
University of Bonn
Römerstrasse 164
53117 Bonn
alda@bonn.edu
http://www.informatik.uni-bonn.de/~alda/

Phone/Fax : Tel.: ++ 44 228 73 4299
Fax.: ++ 44 228 73 4382
Privat : Sascha Alda
Estermannstrasse 122
53117 Bonn
alda@cs.uni-bonn.de
Mobile : on request


last updated: April, 15th 2005