Advertisement

A model for collaborative services in distributed learning environments

  • Volker Hilt
  • Werner Geyer
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 1309)

Abstract

Synchronous collaborative work environments, which are mainly based on video-conferencing systems, suffer a lack of human communication channels and social awareness because mostly only audio, video, and joint editing of documents are supported. Collaborative services such as floor control, session control, and telepointers provide additional communication mechanisms to support persons co-working through computers. We propose a collaborative services model (CSM) for distributed learning environments. Our object-oriented approach includes floor and session control mechanisms and policies. Due to the realization of collaborative services as operations on the model, no specific network collaboration protocol is required. We present an optimistic synchronization scheme which provides consistency for the distributed model.

Keywords

Session Control Access Permission Consistency Rule Floor Control Real Resource 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [Borg95]
    U.M. Borghoff et al.: “Rechnergestützte Gruppenarbeit, Eine Einführung in verteilte Anwendungen”. Springer Verlag, Berlin, Heidelberg, 1995.Google Scholar
  2. [Bor96]
    C. Bormann et al.: “Simple Conference Control Protocol”. Internet draft, IETF, draft-ietf-mmusic-sccp-00.txt, June 1996.Google Scholar
  3. [Cro90]
    T. Crowley et al.: “MMConf: An infrastructure for building shared multimedia applications”. In Proc. CSCW'90, p. 637–650, ACM, New York, 1990.Google Scholar
  4. [Der93]
    G. Dermler et al.: “Constructing a Distributed Multimedia Joint Viewing and Tele-Operation Service for Heterogeneous Workstation Environments”. Proc. of the Fourth Workshop on Future Trends in Distributed Systems, pp. 8–15, Lisbon, 1993.Google Scholar
  5. [Dom97]
    H.-P. Dommel et al.: “Floor Control for Multimedia Conferencing and Collaboration”. In ACM Journal on MM Sys., Vol. 5, No. 1, January 1997.Google Scholar
  6. [Ell91]
    C. A. Ellis et al.: “Groupware — Some Issues and Experiences”. In Communications of the ACM, Vol. 34, No. 1, p. 38–58, 1991.CrossRefGoogle Scholar
  7. [Flu95]
    F. Fluckiger: “Understanding Networked Multimedia Applications and Technology”. Prentice Hall, New York, 1995.Google Scholar
  8. [Gey97]
    W. Geyer et al.: “Multimedia-Technolgie zur Unterstützung der Lehre an Hochschulen”. In Multimediales Lernen in der Beruflichen Bildung, BW — Bildung und Wissen, Nürnberg, 1997.Google Scholar
  9. [Gut95]
    T. F. Gutekunst: “Shared Window Systems”. Dissertation ETH No. 11120, Swiss Federal Institute of Technology, Zurich, 1995.Google Scholar
  10. [Han95]
    M. Handley et al.: “SDP: Session Description Protocol”. Internet-Draft, IETF, draft-ietf-mmusic-sdp-01.ps, November 1995.Google Scholar
  11. [Han96]
    M. Handley et al.: “The Internet Multimedia Conferencing Architecture”. Internet-Draft, draft-ietf-mmusic-confarch-00.ps, IETF, February 1996.Google Scholar
  12. [Hil96]
    V. Hilt: “Modellierung und Implementierung von Protokollen und Mechanismen zur Unterstützung von kooperativem Lernen in einer TeleTeaching-Umgebung”. Master's thesis, University of Mannheim, Germany, 1996.Google Scholar
  13. [ITU96]
    International Telecommunication Union: Recommendation T. 120-Data protocols for multimedia conferencing, July 1996.Google Scholar
  14. [MMC96]
    “Multimedia Collaboration”. User's & Installation Guide, A.01.00, http://www.prz.tu-berlin.de/docs/html/MMC/manual/index.html, Hewlett-Packard Company, June 1996.Google Scholar
  15. [MMU96]
    “Multiparty Multimedia Session Control (MMUSIC) Charter”. URL: http://sauce.mmlab.uninett.no/ietf/mmusic-charter.html, 1996.Google Scholar
  16. [Nak93]
    A. Nakajima: “Telepointing Issues in Desktop Conferencing Systems”. In Computer Communications, Vol. 16, No. 9, 1993.Google Scholar
  17. [She95]
    S. Shenker et al.: “Managing Shared Ephemeral Teleconferencing State: Policy and Mechanism”. Internet draft, IETF, July 1995.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • Volker Hilt
    • 1
  • Werner Geyer
    • 1
  1. 1.University of MannheimGermany

Personalised recommendations