Abstract
Advances in multimedia computing technologies offer new approaches to the support of computer-assisted education and training within many application domains. Novel interactive presentation tools can be built to enhance traditional teaching methods with more active learning. Since a variety of user expectations are possible in such an environment, research must address the incorporation of these factors into presentation tools. During an interactive learning/training process, presentation tools must be able to handle various types of delays. A flexibly adjustable quality of service (QoS) should thus be supported. In this paper, we investigate a framework and systematic strategies for supporting the continuous and synchronized retrieval and presentation of multimedia data streams in a client/server distributed multimedia environment for educational digital libraries. Specifically, we establish a practical framework for specifying multimedia objects, tasks, schedules, and synchronization constraints between media streams. We identify the QoS parameters critical to the support of multimedia presentations for learning and training activities. Based on the proposed framework and QoS specifications, we develop presentation scheduling and buffer management strategies which can enforce the specified QoS requirements in an educational digital library environment.
Similar content being viewed by others
References
J. Allen, “Maintaining knowledge about temporal intervals,” Communications of ACM, Vol. 26, No. 11, 1983.
D.P. Anderson and G. Homsy, “A communication media I/O server and its synchronization mechanisms,” IEEE Computer, Vol. 24, No. 10, pp. 51–57, 1991.
S. Chaudhuri, S. Ghandeharizadeh, and C. Shahabi, “Avoiding retrival contention for composite multimedia objects,” in Proceedings of the 21th VLDB Conference, Zurich, Swizerland, 1995.
Y.F. Day, S. Dagtas, M. Iino, A. Khokhar, and A. Ghafoor, “Spatio-temporal modeling of video data for online object-oriented query processing,” Technical report, School of Electrical Engineering, Purdue University, 1995.
S. Ghandeharizadeh and L. Ramos, “Continuous retrievals of multimedia data using parallelism,” IEEE Transactions on Knowledge and Data Engineering, Vol. 5, No. 4, pp. 658–669, 1993.
S. Gollapudi and A. Zhang, “Buffer management in multimedia database systems,” in the Third IEEE International Conference on Multimedia Computing and Systems (ICMCS'96), Hiroshima, Japan, June 1996.
T.D.C. Little and A. Ghafoor, “Network considerations for distributed multimedia object composition and communication,” IEEE Network Magazine, pp. 32-49, 1990.
T.D.C. Little and A. Ghafoor, “Synchronization and storage models for multimedia objects,” IEEE Journal on Selected Arears in Communications, Vol. 8, No. 3, pp. 413–427, 1990.
F. Moser, A. Kraib, and W. Klas, “L/MRP: A buffer management strategy for interactive continuous data flow in a multimedia DBMS,” in Proceedings of the 21th VLDB Conference, Zurich, Swizerland, 1995.
P.V. Rangan, S. Ramanathan, and T. Kaeppner, “Performance of inter-media synchronization in distributed and heterogeneous multimedia systems,” Computer Networks and ISDN Systems, 1993.
P.V. Rangan and H.M.Vin, “Efficient storage techniques for digital continuous multimedia,” IEEETransactions on Knowledge and Data Engineering, Vol. 5, No. 4, pp. 564–573, 1993.
S.W. Smoliar and H.J. Zhang, “Content-based video indexing and retrieval,” IEEE Multimedia, Vol. 1, No. 2, pp. 62–72, 1994.
R. Steinmetz, “Synchronization properties in multimedia systems,” IEEE Journal on Selected Arears in Communications, Vol. 8, No. 3, pp. 401–412, 1990.
H. Thimm and W. Klas, “Playout management-an integrated service of a multimedia database management system,” Technical Report, GMD-IPSI, 1995.
H.J. Zhang, C.Y. Low, and S.W. Smoliar, “Video parsing and browsing using compressed data,” Multimedia Tools and Applications, Vol. 1, No. 1, pp. 89–111, 1995.
A. Zhang and S. Multani, “Implementation of video presentation in database systems,” in Proceedings of the SPIE Conference on Storage and Retrieval for Still Image and Video Databases IV, San Jose, January 1996, pp. 228-238.
H.J. Zhang, S.Y. Tan, S.W. Smoliar, and G. Yihong, “Automatic parsing and indexing of news video,” Multimedia Systems, Vol. 2, No. 6, pp. 256–266, 1995.
T.F. Znati and B. Field, “A network level channel abstraction for multimedia communication in real-time networks,” IEEE Transactions of Knowledge and Data Engineering, Vol. 5, No. 4, pp. 590–599, 1993.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Zhang, A., Gollapudi, S. QoS Management in Educational Digital Library Environments. Multimedia Tools and Applications 10, 133–156 (2000). https://doi.org/10.1023/A:1009658617338
Issue Date:
DOI: https://doi.org/10.1023/A:1009658617338