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<BODY BACKGROUND = "gif/slate.gif" TEXT = "FFFFFF"LINK = "FFFF00" VLINK = "BF9F00" ALINK = "AFAFAF"><title> Multimedia Group Current Research</title><H1> Research Agenda </h1><h2> Vision </h2><p> Since the debut of the first usable computer almost half a centuryago, the world has witnessed dramatic improvements in computer andcommunications technologies. Whereas breakthroughs in computertechnology have stimulated the integration of digital continuous media(such as audio and video) with computing, rapid advances incommunication technology have made available high-bandwidth,fiber-optic networks at modest cost. The synergy between the advancesin computer and communications technologies promises to create aninfrastructure for designing information management systems in a widerange of application domains.<p> The functionality and the performance attained by most of theexisting information management systems, however, are insignificant ascompared to their potential capability. We believe that the reasonsfor this limitation stem in part from the fact that, traditionally,researchers and developers have almost exclusively focussed onindividual aspects of system design and application development.Consequently, very little attention has been devoted towards designingan integrated system architecture that can efficiently support modernapplications (which may involve text, audio, video, images, animation,etc.). Attaining a breakthrough in designing and evaluating suchsystem architectures, however, will require orchestrating a coherentand comprehensive effort that integrates expertise in mediacompression, information storage and retrieval, database systems,high-speed networking, and systems engineering. The main goal of theDistributed Multimedia Computing Laboratory is to facilitate suchbroadly-based research and to provide an excellent environment forintegrating research work on various aspects of high-performancenetworked multimedia systems.<h2> Current Research </h2> The main research projects currently underway in the DistributedMultimedia Computing Laboratory are: (1) design and implementation ofa multimedia storage server and (2) development of network and transportprotocols for digital audio and video. <ul> <li> <b> Design and implementation of multimedia storage servers: </b>In this project, we are developing methods for efficient placement andretrieval of digital media streams from disk arrays. Our placementpolicies exploit: (1) the sequentiality of media playback to maximizethe disk array throughput during retrieval, and (2) the inherentredundancy in video streams (rather than error-correcting codes) torecover from disk failures. Our retrieval techniques, on the otherhand, exploit the human perceptual tolerance to maximize theutilization of the server resources. The admission control algorithmsthat we have developed make it possible to provide deterministic,statistical, and predictive service guarantees to clients, therebyaddressing the heterogeneous quality of service requirements ofclients. We are currently investigating techniques for efficientlysupporting interactive control operations (such as fast-forward andrewind) as well as methods for enhancing the scalability of themultimedia servers. A prototype multimedia storage server thatinstantiates the results of our research is being implemented in thelaboratory. <p><li> <b> Network and transport protocols for digital audio and video:</b> In this project, we are developing channel admission procedures,bandwidth allocation policies, and scheduling disciplines that areoptimized for supporting media communication from multimedia serversto client sites. We are investigating the utility of employingguaranteed rate scheduling algorithms in conjuction with trafficshaping mechanisms for efficient delivery of video and audio streamsfrom a multimedia server to client sites. We are also investigatingfeedback-based protocols for video communication over high-speednetworks. Finally, we are developing resource reservation and routingalgorithms. We believe that these algorithms will lay the foundationfor addressing the heterogeneity in the computing and networkinginfrastructures as well as the diversity in the quality of servicerequirements of clients in the multimedia computing infrastructures ofthe future.</ul> <p> Since we believe that many of the important and difficult researchissues are likely to be ignored without an ambitious implementationplan, we are currently instantiating our research findings bydesigning and implementing an <i> integrated multimedia file system</i>. Such a prototype implementation will not only validate oursystem design, but will also form the basis of transferring technologyfrom academic environment to commercial and federal institutions. <p><hr><p> If you are interested in receiving detailed information about thespecifics of the research activities in the laboratory, please send amail to Professor Harrick Vin (vin@cs.utexas.edu). <p><hr></body>⌨️ 快捷键说明
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