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检索条件"任意字段=Conference on Multimedia Computing and Networking 1996"

共 135 条记录，以下是91-100 订阅

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Adaptive resource reservation for indoor wireless LANs

Adaptive resource reservation for indoor wireless LANs

引用

IEEE GLOBECOM 1996 - Communications: The Key to Global Prosperity

作者： Lu, SW Srikant, R Bharghavan, V Univ of Illinois Urbana United States

ISBN: (纸本)0780333373

Emerging communication-intensive applications such as multimedia teleconferencing require significant networking resources for efficient operation. In an indoor mobile computing environment, limited wireless resources and user mobility require effective resource reservation algorithms. These requirements demand an efficient advance reservation algorithm in order to minimize handoff call dropping while not compromise network utilization. This paper proposes a design framework and algorithms for advance resource reservation over the wireless link in indoor cellular wireless LANs. The key insight presented in this paper is that different cells in an indoor mobile computing environment behave differently based on location, and need to manage their resources according to their behavior profiles. We present two results: (a) classification of cells and predictive advance reservation based on location and behavior profiles, (b) state-dependent resource reservation based on statistical information.

关键词： Local area networks

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Spectrum sharing under the asynchronous UPCS etiquette: The performance of collocated systems under heavy load

Spectrum sharing under the asynchronous UPCS etiquette: The ...

引用

Proceedings of the 1996 2nd Annual International conference on Mobile computing and networking, MOBICOM

作者： Vukovic, Ivan McKown, John Motorola Multimedia Group United States

ISBN: (纸本)9780897918725

Recently the FCC opened three 10 MHz bands for unlicensed use. In order to operate in UPCS bands, devices must comply with rules known as the UPCS etiquette. In this paper we study channel sharing between two or more collocated systems under the asynchronous UPCS etiquette. In particular we show that under heavy load individual systems have a tendency to hold the channel for hundreds of milliseconds, thus blocking all traffic in other, competing systems. We have calculated the distribution of the blocking time for two versions (or interpretations) of the UPCS etiquette. The impact of the average blocking time on delay sensitive traffic is discussed and possible improvements achieved through a tradeoff between system capacity and average blocking time are investigated.

关键词： Mobile telecommunication systems

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Bringing real-time scheduling theory and practice closer for multimedia computing 96

Bringing real-time scheduling theory and practice closer for...

引用

1996 ACM SIGMETRICS International conference on Measurement and Modeling of Computer Systems, SIGMETRICS 1996

作者： Gopalakrishnan, R. Parulkar, Gurudatta M. Department Of Computer Science Washington University St. Louis United States

ISBN: (纸本)0897917936

This paper seeks to bridge the gap between theory and practice of real-time scheduling in the domain of high speed multimedia networking. We show that the strict preemptive nature of real-time scheduling leads to more context switching, and requires system calls for concurrency control. We present our scheduling scheme called rate-monotonic with delayed preemption (rmdp) and show how it reduces both these overheads. We then develop the analytical framework to analyze rmdp and other scheduling schemes that lie in the region between strict (immediate) preemption and no preemption. Our idealized scheduler simulation methodology accounts for the blocking introduced by these schemes under the usual assumption that the time for context switching and preemption is zero. We derive simpler schedulability tests for non-preemptive scheduling, and prove a variant of rate-monotonic scheduling that has fewer preemptions. Our measurements on Sparc and Pentium platforms, show that for the workloads we considered, Rmdp increases useful utilization by as much as 8%. Thus our scheduling policies have the potential to improve performance over existing methods. © 1996 ACM.

关键词： Concurrency control

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SIGMETRICS 1996 - Proceedings of the 1996 ACM SIGMETRICS International conference on Measurement and Modeling of Computer Systems

SIGMETRICS 1996 - Proceedings of the 1996 ACM SIGMETRICS Int...

引用

1996 ACM SIGMETRICS International conference on Measurement and Modeling of Computer Systems, SIGMETRICS 1996

ISBN: (纸本)0897917936

The proceedings contain 30 papers. The topics discussed include: bringing real-time scheduling theory and practice closer for multimedia computing;exploiting process lifetime distributions for dynamic load balancing;effective distributed scheduling of parallel workloads;limits on the performance benefits of multithreading and prefetching;fast message assembly using compact address relations;coordinated allocation of memory and processors in multiprocessors;Embra: fast and flexible machine simulation;experiences with network simulation;asynchronous updates in large parallel systems;design and analysis of frame-based fair queueing: a new traffic scheduling algorithm for packet-switched networks;and networking support for large scale multiprocessor servers.

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Moving DSP into new curricular areas

Moving DSP into new curricular areas

引用

Asilomar conference on Signals, Systems & Computers

作者： L.S. DeBrunner S. Radhakrishnan V.E. DeBrunner University of Oklahama Norman OK USA

The Telecomputing Laboratory, established under the NSF Instrumentation and Laboratory Improvement program, was designed as a dual-use facility to serve students in both digital signal processing (DSP) classes and an innovative "telecomputing" class dealing with distributed multimedia processing. The telecomputing class involves students in computer engineering, electrical engineering, and computer science. In this class, we have brought the basic principles of DSP to students with a limited background in systems through integration with basic principles of networking, multimedia, and computer architecture.

关键词： Digital signal processing Laboratories Instruments Signal design Electrical engineering computing Telecommunication computing Electrical engineering Computer science multimedia systems Computer architecture

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Spectrum sharing under the asynchronous UPCS etiquette: the performance of collocated systems under heavy load 96

Spectrum sharing under the asynchronous UPCS etiquette: the ...

引用

Proceedings of the 2nd annual international conference on Mobile computing and networking

作者： Ivan Vukovic John McKown Motorola Multimedia Group MOBICOM 96 Rye NY

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ATM without strings: an overview of wireless ATM

ATM without strings: an overview of wireless ATM

引用

IEEE International conference on Personal Wireless Communication

作者： A.S. Krishnakumar AT and T Bell Laboratories Inc. Nieuwegein Netherlands

A majority of applications in the near-future are expected to be multimedia-capable. One of the enabling technologies for this to happen is asynchronous transfer mode (ATM) networking. In addition, the exploding use of mobile terminals-laptop computers, personal digital assistants (PDAs) etc.-means there will be more demand to extend these multimedia-capable applications to the mobile terminal. This requires the extension of ATM technology to high-speed wireless communications (>20 Mbps). This is an active area of research around the world. This article describes the technical challenges posed by wireless ATM networking and gives an overview of wireless ATM efforts under way, focusing on specific research projects in the USA and Europe.

关键词： Asynchronous transfer mode Application software Personal digital assistants Mobile computing Wireless communication Switches Portable computers Europe Data communication Computer networks

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Network algorithms and protocol for multimedia servers

Network algorithms and protocol for multimedia servers

引用

IEEE Annual Joint conference: INFOCOM, IEEE Computer and Communications Societies

作者： P. Goyal H.M. Vin Distributed Multimedia Computing Laboratory Department of Computer Sciences University of Texas Austin Austin TX USA

We present a network service specifically designed for multimedia servers. It uses a histogram based traffic characterization and an overload control protocol to the eliminate packet losses in the network while providing heterogeneous statistical QoS. The key contribution of our protocol lies in combining open-loop and feedback-based control to: (1) provide heterogeneous QoS to clients in networking environments consisting of switches that may not have any scheduling support; and (2) migrate the functionality of discarding packets, in the event of congestion, to the sources which understand the semantics of the data. The protocol is efficient, makes very few assumptions about the underlying network, is realizable on current switching hardware (supporting FCFS scheduling), and is completely integrated with the architecture of a multimedia server.

关键词： Protocols Network servers Streaming media Video compression Bit rate Communication system traffic control Quality of service multimedia computing Laboratories Open loop systems

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Security for real-time MPEG compressed video in distributed multimedia applications

Security for real-time MPEG compressed video in distributed ...

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International Phoenix conference on Computers and Communications (IPCCC)

作者： G.A. Spanos T.B. Maples Aerosp. Corp. CA USA California State University Long Beach USA

Emerging computer network technologies promise to provide distributed multimedia in real-time. Security of real-time video, an important component of distributed multimedia applications, is increasingly becoming one of the major concerns of the computer networking community. This study presents Aegis, a security system for Motion Picture Experts Group (MPEG) compressed video transmissions. Aegis utilizes the concepts of the MPEG video compression algorithm in order to provide an effective and efficient security mechanism. A prototype implementation is used to evaluate its effectiveness in securing video transmissions. Simulation results of Aegis in an asynchronous transfer mode (ATM) technology environment are also presented in order to demonstrate its performance in comparison to traditional encryption/decryption methods.

关键词： Transform coding Video compression Computer networks Asynchronous transfer mode Computer security Application software Distributed computing Motion pictures Prototypes Cryptography

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Micro- and Opto-Electronics Technologies towards multimedia Era

Micro- and Opto-Electronics Technologies towards Multimedia ...

引用

European conference on Solid-State Device Research (ESSDERC)

作者： Tetsuhiko Ikegami NTT Nippon Telegraph and Telephone Corporation Atsugi Kanagawa Japan

What's multimedia? Without a clean answer, industries are running towards the virtual target and looking for business chance. However, we have to recognize that a lot of changes have happened if we look back a year ago. Wireless access systems as well as wired access, WDM (Wavelength Division Multiplex) photonic networking, low power consumption technology, low cost Optical Network Unit (ONU), which are essential in going into the multimedia Era, have indicated us new technological directions. In this talk, emerging device technologies will be reviewed.

关键词： CMOS technology Large scale integration Energy consumption Optical network units Wavelength division multiplexing High speed optical techniques multimedia systems Technological innovation Telecommunication computing Asynchronous transfer mode

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