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			WEI ZHAO

  will be held:		Friday August 13, 1999 at 11:00 a.m.
			A. V. Williams Building, Room 3185

  Title of Proposal:	Adaptive Streaming of Scalable Multimedia over
			Heterogeneous Environments


   Abstract: The proliferation of multimedia-capable, end-user
computing/communication devices promises ubiquituous multimedia
communications in the near future.  However, the increased diversities and
resource fluctuations in networks and end-user devices pose a unique set
of challenges for the development of a universal multimedia streaming
system.

We propose an adaptive streaming system based on scalable multimedia
as a solution to these challenges. The proposed system is capable of
scaling a multimedia presentation optimally to a number of different
qualities depending on the particular network and device resource and
capabilities. Resource fluctuations are handled in a responsive and
graceful manner by dynamically switching the ongoing multimedia stream
among the set of presentation layers. Unlike many previous proposals,
our techniques achieve the above goals using the minimal amount of
resource and guarantee deterministic quality-of-service.

In a large-scale media delivery system, allocating resources individually
to variable-bit-rate multimedia streams is quite wasteful of network and
end-system resources. We propose an optimal stream multiplexing technique
to minimize the resource usage of delivering a set of multimedia streams
to distributed receivers. Minimizing aggregate resource usage allows the
proposed adaptive streaming system to support as many end-users as
possible and operate in a cost-effective manner.		


  Examining Committee:	Dr. Satish Tripathi, Chair
			Dr. Loiuqa Raschid, Dept. Rep.
			Dr. Ashok Agrawala
			Dr. Leana Golubchik
			Dr. Samir Khuller

    EVERYONE IS CORDIALLY INVITED TO ATTEND THE PRESENTATION.