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An optimal bandwidth allocation strategy for the delivery of compressed prerecorded video

MULTIMEDIA systems 1997年第5期5卷 297-309页

作者： Feng, WC Jahanian, F Sechrest, S Software Systems Research Lab Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor Michigan USA e-mail: {wuchifarnamsechrest}@eecs.umich.edu. US

The transportation of prerecorded, compressed video data without loss of picture quality requires the network and video servers to support large fluctuations in bandwidth requirements. Fully utilizing a client-side buffer for smoothing bandwidth requirements can limit the fluctuations in bandwidth required from the underlying network and the video-on-demand servers. This paper shows that, for a fixed-size buffer constraint, the critical bandwidth allocation technique results in plans for continuous playback of stored video that have (1) the minimum number of bandwidth increases, (2) the smallest peak bandwidth requirements, and (3) the largest minimum bandwidth requirements. In addition, this paper introduces an optimal bandwidth allocation algorithm which, in addition to the three critical bandwidth allocation properties, minimizes the total number of bandwidth changes necessary for continuous playback. A comparison between the optimal bandwidth allocation algorithm and other critical bandwidth-based algorithms using 17 full-length movie videos and 3 seminar videos is also presented.

关键词： video-on-demand bandwidth allocation MPEG video compression smoothing

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Relative Mel-Frequency Cepstral Coefficients Compensation for Robust Telephone Speech Recognition 5

Relative Mel-Frequency Cepstral Coefficients Compensation fo...

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5th European Conference on Speech Communication and Technology, EUROSPEECH 1997

作者： Han, Jiqing Han, Munsung Park, Gyu-Bong Park, Jeongue Gao, Wen Language Understanding Lab. Systems Engineering Research Institute ETRI Korea Republic of Department of Computer Science and Engineering Harbin Institute of Technology China

It is a crucial factor to find the robust and simple computation methods for the actual application of telephone speech recognition. In this paper, we propose a new channel compensation method, which uses a RASTA-like band-pass filter on the mel-frequency cepstral coefficients for robust telephone speech recognition. It is shown from the experiments that the proposed method, comparing with the RASTA processing, reduces the computational complexity without losing performance, and it is also better than CMS and two level CMS on the performance. We also verify that it is an effective approach to suppress very low modulation frequencies for robust telephone speech recognition. © 1997 5th European Conference on Speech Communication and Technology, EUROSPEECH 1997. All rights reserved.

关键词： Bandpass filters

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Designing and prototyping continuous media file system on clustered workstations 4

Designing and prototyping continuous media file system on cl...

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4th International Conference on Multi-Media Modeling, MMM 1997

作者： Hwang, Se-Jin Kim, Jin-Uok Park, Myong-Soon Kwon, Oh-Young Kim, Tae-Geun Computer Systems Lab. Dept. of Computer Science Korea University Anam-dong 5 ga Sungbuk-gu Seoul137-701 Korea Republic of Distributed Computing Lab. Dept. of Network Computing Systems Engineering Research Institute P.O.Box 1 Yusung Taejon305-600 Korea Republic of

ISBN: (纸本)9810233515

The widespread acceptance of multimedia application has stimulated the development of multimedia server and its file system to guarantee the real-time requirement of continuous media streams. We designed and prototyped a continuous media file system on top of clustered workstations, called Crown(Clustered resources on workstations' network). Its file system, CrovmFS, guarantees glitch-less streams to many clients at the same time. We protototyped it to find bottleneck points of Crown in advance of the implementation. © Multimedia Modeling, MMM 1997 - Modeling Multimedia Information and systems. All rights reserved.

关键词： File organization

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An efficient local address generation for the block-cyclic distribution 3

An efficient local address generation for the block-cyclic d...

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3rd International Conference on Algorithms and Architectures for Parallel Processing, ICA3PP 1997

作者： Kwon, Oh-Young Kim, Tae-Geun Han, Tack-Don Yang, Sung-Bong Kim, Shin-Dug Distributed Computing Lab. Systems Engineering Research Institute 1 Ueun-dong Yusong-gu Taejon305-333 Korea Republic of Parallel Processing System Laboratory Dept. of Computer Science Yonsei University Seoul120-749 Korea Republic of

ISBN: (纸本)0780342291

In order to generate local addresses for an array section A(l:h:s) with block-cyclic distribution, an efficient compiling method is required. In this paper, two local address generation methods for the block-cyclic distribution are presented. One is a simple local address generation method that is modified from the virtual-block scheme. The other is a linear-time ΔM table construction method. The array elements of A(l:h:s) to be accessed at run-time build up a family of lines. By using the equation of the lines, a ΔM table can be generated in O(k) time. Experimental results show that a simple local address generation method has poor performance but a linear-time ΔM table generation method is faster than other algorithms in ΔM table generation time and access time for 10,000 array elements. © 1997 IEEE.

关键词： Virtual addresses

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Channel compensation for robust telephone speech recognition

Channel compensation for robust telephone speech recognition

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IEEE Region 10 International Conference TENCON

作者： Jiqing Han Munsung Han Wen Gao Language Understanding Lab. Syst. Eng. Res. Inst. South Korea Systems Engineering Research Institute Language Understanding Laboratory Electronics and Telecommunications Research Institute South Korea Department of Computer Science and Engineering Harbin Institute of Technology China

Channel compensation has been proved to be an effective approach for robust speech recognition. We first use two level cepstral mean substraction (CMS) for channel compensation in telephone speech recognition, and then propose a new channel compensation method, RMFCC. For all experiments, a Korean isolated 84 words database consisting of 80 speakers collected from a local telephone line is adopted. Using the RMFCC, a 39.8% reduction in word error rate is obtained relative to the conventional HMM system. It is shown from the experiments that the RMFCC, compared with RASTA, reduces the computational complexity without losing accuracy, and is also better than the CMS and two level CMS in performance.

关键词： Robustness Telephony Speech recognition Collision mitigation Cepstral analysis Hidden Markov models Automatic speech recognition Band pass filters Nonlinear distortion Error analysis

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Hot methanol extraction for the analysis of volatile organic chemicals in subsurface core samples from Dover Air Force Base, Delaware

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GROUND WATER MONITORING AND REMEDIATION 1997年第1期17卷 104-121页

作者： Ball, WP Xia, G Durfee, DP Wilson, RD Brown, MJ Mackay, DM William P. Ball is an assistant professor in the Department of Geography and environmental engineering at Johns Hopkins University (313 Ames Hall 3400 N. Charles St. Baltimore MD 21218). His research interests are in the physical and chemical processes that control contaminant fate in aqueous systems both in the natural environment and in engineered processes of treatment and remediation. Recent work has included both laboratory and computer modeling studies related to contaminant fate and transport in subsurface environments. Ball holds M.S. and Ph.D. degrees in environmental engineering and science from Stanford University and a B.S. degree in civil engineering from the University of Virginia. He is a registered pro-fessional engineer in the state of Virginia. Guoshou Xia is a Ph.D. candidate at Johns Hopkins University He was previously a lecturer in the Department of Civil Engineering at Southeast University in China. He received his B.S. degree in chemistry from Hefei University and his M.S. degree in environmental engineering from East China University of Chemical Technology. His current research interests are in the area ofsubsurface contaminant transport with emphasis on better understanding the nature of organic contaminant interactions with subsurface solids. Donald P. Durfee received his M.S. degree in environmental engineering from Johns Hopkins University in 1993 and is currently a Ph.D. student at Johns Hopkins. He is studying contaminant fate and transport in the subsurface and is also interested in site characterization and remediation issues. Ryan D. Wilson is a research associate and Ph.D. student in the Department of Earth Sciences at the University of Waterloo Waterloo Ontario. His research interests include field and modeling studies of semipassive remediation technologies and the behavior of gaseous tracers. Wilson received his B.Sc. in geology from the University of Alberta in 1987 and his M.Sc. in earth sciences (hydrogeology) from the University of Waterloo in 1993. Michael J. Br

The evaluation of contaminant concentrations in ground water and soil is an essential aspect of most hazardous waste remedial investigations. This paper describes methods applied toward obtaining, preserving, and analyzing subsurface samples for the determination of VOC concentrations in the saturated region of an unconfined coastal plain aquifer at Dover Air Force Base (DAFB), Delaware. The described protocol involved headspace-free subsampling of cores, field preservation of subsamples in methanol, and overnight extraction of the VOCs at elevated temperature (70 degrees C). Methanol-extracted compounds were subsequently transferred to hexane and analyzed by gas chromatography. The method was found to achieve quantitative extraction from the aquifer sands in a single step, although extraction from fine-grained and more strongly sorbing aquitard samples required multiple methanol extractions to achieve comparable recovery. An extensive set of DAFB results is presented as an indication of how these methods can be applied toward characterizing field-scale contamination with a high degree of resolution and accuracy. These data have enabled a quantitative estimate of the contaminant distribution at this site and offer valuable insight into processes of contaminant migration into the underlying aquitard. In these regards, the methods used are believed to have provided much more accurate results than could have been obtained using more commonly applied techniques.

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A software engineering subject on system description techniques

A software engineering subject on system description techniq...

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996 International Conference Software engineering: Education and Practice, SEEP 1996

作者： Chang, E. Department of Computer Science and Computer Engineering La Trobe University Zntelligent Systems Lab Applied Computing Research Institute Melbourne Australia

ISBN: (纸本)0818673796

The paper describes a software engineering subject on system description techniques (SDT). This course explains the system description techniques (SDTs) for describing both the models that arise from analysis as well as design. It is therefore of immense importance as a prelude to the software engineering project. The students are introduced to a wide number of techniques including data oriented, process oriented, state oriented and object oriented techniques. These techniques describe somewhat different aspects of a software system. There are a number of problems related to teaching, students, lack of suitable books and examples. The paper describes how they are addressed. © 1996 IEEE.

关键词： Students

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Effect of correlation between subcarriers of an MCM/DSSS communication system

Effect of correlation between subcarriers of an MCM/DSSS com...

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IEEE Conference on Vehicular Technology (VTC)

作者： R.E. Ziemer N. Nadgauda Electrical and Computer Engineering Dept. University of Colorado Colorado Springs CO Communications Systems Research Lab. Motorola Inc. Schaumburg IL

The analysis of a combined multicarrier modulation/direct-sequence spread-spectrum (DSSS) modem carried out by Kondo and Milstein (see IEEE Trans. on Commun., 1995) in delay spread multipath is extended to include the effect of correlation between the DSSS subcarriers due to an exponential power delay profile. Analytical and simulation results show that additional diversity gain can be achieved with more subcarriers, but at the expense of multiple access capability. Eventually, an irreducible bit error probability (BEP) is approached as more subcarriers are used.

关键词： Spread spectrum communication Bandwidth Diversity reception Frequency Power system modeling Fading Random variables Springs Modems Delay effects

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Application of an integrated fuzzy, knowledge-based, connectionistic architecture for fault diagnosis in power systems

Application of an integrated fuzzy, knowledge-based, connect...

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International Conference on Intelligent systems Applications to Power systems (ISAP)

作者： S.K. Tang T.S. Dillon R. Khosla Expert & Intelligent Syst. Lab. La Trobe Univ. Bundoora Vic. Australia Expert & Intelligent Systems Laboratory Applied Computing Research Inst and Department of Computer Science and Computer Engineering La Trobe University Bundoora VIC Australia

In this paper, we show the relevance of fuzzy systems in an integrated symbolic-subsymbolic architecture, GENUES (generic neuro-expert system), for information processing. Fuzzy logic is used for modelling knowledge in different phases of the GENUES architecture. As an illustration we show the application of fuzzy logic in the decision phase and post-processing phase of GENUES for power system fault diagnosis.

关键词： Fault diagnosis Fuzzy systems Artificial neural networks Problem-solving Power system faults Intelligent systems Power engineering computing Fuzzy logic Knowledge based systems Power system modeling

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CRITICAL BANDWIDTH ALLOCATION FOR THE DELIVERY OF COMPRESSED VIDEO

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computer COMMUNICATIONS 1995年第10期18卷 709-717页

作者： FENG, WC SECHREST, S Software Systems Research Lab Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

The transportation of compressed video data without loss of picture quality requires the network to support large fluctuations in bandwidth requirements. These fluctuations can be smoothed, but straightforward approaches to smoothing can still suffer from excessive buffering requirements, poor buffer utilization and an excessive number of bandwidth changes. This paper introduces critical bandwidth allocation, which reduces the number of bandwidth changes to a very small number, and achieves the maximum effectiveness from client-side buffers. A comparison between critical bandwidth allocation algorithms and other smoothing algorithms is presented, the sensitivity of the algorithm to jitter is examined, and, implications for the design of network services are discussed.

关键词： VIDEO-ON-DEMAND BANDWIDTH ALLOCATION MPEG VIDEO COMPRESSION SMOOTHING

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