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IEEE International Conference on Multimedia and Expo (ICME)

作者： Mei-Ling Shyu Shu-Ching Chen Hongli Luo Department of Electrical and Computer Engineering University of Miami Coral Gables FL USA Distributed Multimedia Information System Laboratory School of Computer Science Florida International University Miami FL USA

ISBN: (纸本)0780379659

In this paper, we propose a rate control mechanism for multimedia multicast streaming in the Internet. A single and optimal transmission rate that is adaptive to the network congestion, buffer occupancies, and the playback requirements of the member clients in the multicast group is allocated. We optimize the multicasting delivery in the Internet by improving the buffer occupancy of all clients for on-time presentation while using the minimal transmission rate. Scalable playback is used for the clients with low bandwidth capabilities in a heterogeneous environment. Simulation results show that the buffer capacity can be efficiently improved and fairness is ensured among the member clients.

关键词： Streaming media Bandwidth Internet Multicast protocols Web server Multimedia systems Information systems Laboratories computer science Adaptive systems

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An adaptive multimedia transmission protocol for distributed multimedia applications

An adaptive multimedia transmission protocol for distributed...

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International Conference on Distributed Computing systems Workshop

作者： Shu-Ching Chen Mei-Ling Shyu I. Gray Hongli Lu Distributed Multimedia Information System Laboratory School of Computer Science Florida International University Miami FL USA Department of Electrical and Computer Engineering University of Miami Coral Gables FL USA

In this paper, an end-to-end real-time adaptive protocol for multimedia transmission is presented. The transmission rate is determined by the quadratic probing algorithm that can obtain the maximal utilization of the client buffer and minimal allocation of the network bandwidth. It is also coupled with a congestion control mechanism that can effectively decrease the packet loss rate during network congestion. We investigate the performance of our quadratic probing algorithm in different congestion levels under both Local Area Net (LAN) and Internet environment. Performance analysis reveals that our approach is more robust in avoiding overflow and underflow in different network congestion levels, and adapting to the changing network delays. Comparisons are made with the fixed rate approach and the rate by playback requirement approach. Experimental results show that the proposed real time protocol with rate adjusting quadratic probing algorithm is efficient in utilizing the network resources and decreasing the packet loss ratios.

关键词： Protocols Bandwidth Quality of service Multimedia systems Local area networks Streaming media Videoconference Adaptive control Application software Real time systems

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MMM: a stochastic mechanism for image database queries

MMM: a stochastic mechanism for image database queries

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International Symposium on Multimedia Software engineering

作者： M.-L. Shyu S.-C. Chen M. Chen C. Zhang Chi-Min Shu Department of Electrical & Computer Engineering University of Miami Coral Gables FL USA Distributed Multimedia Information System Laboratory School of Computer Science Florida International University Miami FL USA Department of Environmental and Safety Engineering National Yunlin University of Science and Technology Yunlin Taiwan

We present a mechanism called the Markov model mediator (MMM) to facilitate the effective retrieval for content-based image retrieval (CBIR). Different from the common methods in content-based image retrieval, our stochastic mechanism not only takes into consideration the low-level image content features, but also learns high-level concepts from a set of training data, such as access frequencies and access patterns of the images. The advantage of our proposed mechanism is that it exploits the structured description of visual contents as well as the relative affinity measurements among the images. Consequently, it provides the capability to bridge the gap between the low-level features and high-level concepts. Our experimental results demonstrate that the MMM mechanism can effectively assist in retrieving more accurate results for user queries.

关键词： Stochastic processes Image databases Image retrieval Information retrieval Content based retrieval Feedback Digital images Spatial databases Distributed computing Multimedia systems

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Per-class queue management and adaptive packet drop mechanism for multimedia networking

Per-class queue management and adaptive packet drop mechanis...

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IEEE International Conference on Multimedia and Expo (ICME)

ISBN: (纸本)0780379659

In this paper, we propose a per-class queue management and adaptive packet drop mechanism in the routers for Internet congestion control. We model active queue management as an optimization problem and our proposed mechanism provides congestion control and fairness for different types of traffic flows. An optimal packet drop rate is obtained to maintain a relatively small queue occupancy, which provides a less queue delay delivery of packets. Simulations are conducted to compare our approach with the fixed packet drop rate approach. Moreover, the queue occupancy and the packet drop rates obtained are both upper bounded, which is meaningful for providing the class-based guaranteed delay services for real-time multimedia applications.

关键词： Delay Quality of service computer network management Multimedia systems IP networks Traffic control Telecommunication traffic Protection Jitter Streaming media

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On estimation of fault efficiency for path delay faults

On estimation of fault efficiency for path delay faults

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Asian Test Symposium (ATS)

作者： Fukunaga Kajihara Takeoka Graduate School of Computer Science and System Engineering Kyushu Institute of Technology Japan Center for Microelectronics Systems Kyushu Institute of Technology Japan Semiconductor Company Matsushita Elecrric Indusrrial Company Limited Japan

In this paper, we propose a method to estimate fault efficiency for path delay faults based on untestable path analysis. In path delay fault testing, fault coverage of test patterns is usually, very low, because logic circuits often have huge number of paths including many untestable paths. Hence we should compute fault efficiency rather than fault coverage, but it is too difficult to compute exact fault efficiency in a short time, because there is no method to compute total number of untestable paths quickly. The proposed method statistically estimate the number of untestable paths based on untestable path analysis, and compute fault efficiency. Experimental results show that the proposed method can accurately estimate fault efficiency of given test patterns in a reasonable time.

关键词： Logic circuit testing Fault diagnosis Combinational logic circuits Sequential logic circuits Very-large-scale integration

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Developing a formal specification for the mission system of a maritime surveillance aircraft

Developing a formal specification for the mission system of ...

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International Conference on Application of Concurrency to system Design

作者： L. Petrucci J. Billington L.M. Kristensen Z.H. Qureshi ENS de Cachan LSV CNRS UMR 8643 Cachan France Computer Systems Engineering Centre School of Elec. and Information Engineering University of South Australia Mawson Lakes SA Australia Department of Computer Science University of Aarhus Aarhus Denmark System Sciences Laboratory Defence Science and Technology Organisation Edinburgh SA Australia

The mission system of an aircraft is a complex real-time distributed system consisting of a mission control computer, different kinds of devices interconnected by a number of serial data buses. The complexity and real-time requirements of mission systems have motivated research into the application of formal techniques to investigate and predict the effects of upgrades on mission system behaviour. We report on a joint research project between the University of South Australia and Australia's Defence science and Technology Organisation. In previous work we modelled a generic avionics mission system with coloured Petri nets and analysed the model using state spaces. Here, we describe how this model was refined and modified to obtain a coloured Petri net model for the AP-3C Orion maritime surveillance aircraft.

关键词： Formal specifications Surveillance Aircraft Real time systems Aerospace electronics Aerospace control Control systems Distributed computing Data buses Application software

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Behavior Relativity of Petri Nets

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Journal of computer science & Technology 2002年第6期17卷 770-780页

作者：蒋昌俊王怀清廖少毅 Department of Computer Science and Engineering Tongji University Shanghai 200092 P.R. ChinaThe School of Information Science and Engineering Ningbo University Ningbo 315211 P.R. ChinaDepartment of Computer Science and Technology University of Sha Department of Information System City University of Hong Kong Kowloon Hong Kong P.R. China

This paper presents a novel methodology for modelling and analyzing of behav-ior relations of concurrent systems. The set of all firing sequences of a Petri net is an importanttool for describing the dynamic behavior of concurrent systems. In this paper, the behaviorrelativity of two concurrent subsystems in their synchronous composition is presented. Such be-havior relativities, including Controlled Relativity, United Relativity, Interactive Relativity andExclusive Relativity, are defined respectively. The properties of the relativities are discussed indetail. The analysis method for these properties is based on minimum T-invariants, when twosubsystems are live bounded Petri nets. A well-known example has also been analyaed usingthe new methodology to demonstrate the advantages of the proposed methodology.

关键词： Petri网行为相对性系统分析

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End-to-End Congestion Control via Optimal Bandwidth Allocation for Multimedia Streams 15

End-to-End Congestion Control via Optimal Bandwidth Allocati...

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15th International Conference on computer Applications in Industry and engineering, CAINE 2002

作者： Shyu, Mei-Ling Chen, Shu-Ching Luo, Hongli Department of Electrical and Computer Engineering University of Miami Coral GablesFL33124 United States Distributed Multimedia Information System Laboratory School of Computer Science Florida International University MiamiFL33199 United States

ISBN: (纸本)9781618395351

In this paper, an end-to-end congestion controlled optimal bandwidth allocation scheme with a transmission rate control mechanism for multimedia transmission is proposed. This rate control mechanism aims at minimizing the allocated rate and maximizing the utilization of the client buffer. By adjusting the transmission rate in response to the buffer occupancy and the playback requirements in the client, and variations in the network delay and packet loss rate, an acceptable quality-of-service (QoS) level can be maintained at the end systems. Simulation results show that our proposed scheme can generally achieve high network utilization and low losses, and no network support is needed. Copyright © (2002) by the International Society for computers and Their Applications All rights reserved.

关键词： Quality of service

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A stochastic model for content-based image retrieval 3rd

A stochastic model for content-based image retrieval

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3rd IEEE Pacific Rim Conference on Multimedia, PCM 2002

作者： Shyu, Mei-Ling Chen, Shu-Ching Luo, Lin Shu, Chi-Min Department of Electrical and Computer Engineering University of Miami Coral GablesFL United States Distributed Multimedia Information System Laboratory School of Computer Science Florida International University MiamiFL United States Department of Environmental and Safety Engineering National Yunlin University of Science and Technology Touliu Yunlin Taiwan

ISBN: (纸本)3540002626

Multimedia data, typically image data, is increasing rapidly across the Internet and elsewhere. To keep pace with the increasing volumes of image information, new techniques need to be investigated to retrieve images intelligently and efficiently. Content-based image retrieval is always a challenging task. In this paper, a stochastic model, called Markov Model Mediator (MMM) mechanism, is used to model the searching and retrieval process for content-based image retrieval. Different from the common methods, our stochastic model carries out the searching and similarity computing process dynamically, taking into consideration not only the image content features but also other characteristics of images such as their access frequencies and access patterns. Experimental results demonstrate that the MMM mechanism together with the stochastic process can assist in retrieving more accurate results for user queries. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Stochastic models

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Scene change detection by audio and video clues

Scene change detection by audio and video clues

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2002 IEEE International Conference on Multimedia and Expo, ICME 2002

作者： Chen, Shu-Ching Shyu, Mei-Ling Liao, Wenhui Zhang, Chengcui Distributed Multimedia Information System Laboratory School of Computer Science Florida International University MiamiFL33 199 United States Department of Electrical and Computer Engineering University of Miami Coral GablesFL33124 United States

ISBN: (纸本)0780373049

Automatic video scene change detection is a challenging task. Using audio or visual information alone often cannot provide a satisfactory solution. However, how to combine audio and visual information efficiently still remains a difficult issue since there are various cases in their relationship due to the versatility of videos. We present an effective scene change detection method that adopts the joint evaluation of the audio and visual features. First, video information is used to find the shot boundaries. Second, the audio features for each video shot can be extracted. Lastly, an audio-video combination schema is proposed to detect the video scene boundaries. © 2002 IEEE.

关键词： Pattern recognition

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