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A consensus algorithm for synchronous distributed systems using mobile agent

A consensus algorithm for synchronous distributed systems us...

引用

Pacific Rim International Symposium on Dependable Computing

作者： Jiannong Cao Xianbing Wang Siu Lo S.K. Das Internet Computing and E-Commerce Lab Department of Computing Hong Kong Polytechnic University Kowloon Hong Kong China Computer Center School of Computer Wuhan University of China Wuhan Hubei China Center for Research Wireless Mobility and Networking (CrewMan) Department of Computer Science and Engineering University of Technology Arlington TX USA

In this paper, we present a consensus algorithm for synchronous distributed systems using cooperating mobile agents. The algorithm is designed within a framework for mobile agent enabled distributed server groups (MADSG), where cooperating mobile agents are used to achieve coordination among the servers. Being autonomous and cooperative, cooperating mobile agents exchange information among themselves to achieve consensus. The correctness proof of the proposed algorithm is presented. Performance evaluation of the algorithm has been carried out by both theoretical analysis and simulation.

关键词： Mobile agents computer networks Distributed computing Mobile computing Algorithm design and analysis Distributed control IP networks computer science Network servers Performance analysis

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A framework of using cooperating mobile agents to achieve load sharing in distributed Web server groups

A framework of using cooperating mobile agents to achieve lo...

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IEEE International Conference on Algorithms and Architectures for Parallel Processing (ICAP)

作者： Jiannong Cao Xianbing Wang S.K. Das Internet Computing and E-Commerce Laboratory Department of Computing Hong Kong Polytechnic University Kowloon Hong Kong China Computer Center School of Computer Wuhan University of China Wuhan Hubei China Center for Research in Wireless Mobility and Networking Department of Computer Science and Engineering University of Texas Arlington Arlington TX USA

This paper studies the issues of using mobile agents to achieve load sharing for network services in a wide-area network environment such as the Internet. Traditionally, load sharing algorithms are based on the message-passing paradigm. In this paper, we propose the use of mobile agents as an aid to design fully distributed and dynamic load-sharing mechanisms for wide-area network services, which provide several advantages over the pure message passing-based approach. A framework (called MALS-mobile agent-enabled load sharing) for structuring and designing load sharing in wide-area network services is presented. In particular, we describe the design of a mobile agent-enabled distributed dynamic load sharing scheme within the MALS framework. A simulation environment of the load sharing protocol is being implemented using Aglet/spl trade/, a Java-compliant mobile agent platform from IBM. Preliminary experimental results demonstrated that the proposed framework is effective.

关键词： Mobile agents Web server Network servers Web and internet services computer networks IP networks Java Multicast protocols Algorithm design and analysis Message passing

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Using only proportional jitter scheduling at the boundary of a Differentiated Service network: simple and efficient

Using only proportional jitter scheduling at the boundary of...

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European Conference on Universal Multiservice Networks (ECUMN)

作者： Thu Ngo Quynh H. Karl A. Wolisz K. Rebensburg Interdepartmental Research Center for Networking and Multimedia Technology PRZ FSP PV TUBKOM Technical University Berlin Berlin Germany Telecommunication Networks Group Department of Electrical Engineering and Computer Science Technical University Berlin Berlin Germany

There exist some studies in proportional delay scheduling algorithms for a Differentiated Service (DiffServ) network which schedule the packets between different classes proportionally based on queuing delay. Traditionally, it is necessary to implement such proportional delay scheduling algorithms at all the routers of the network for receiving proportional delay between different classes. In this paper, we propose a new and simple model, which does not provide proportional delay but delay jitter between different classes. In addition, we point out that for receiving proportional jitter in such a DiffServ Network, it is only necessary to implement a proportional jitter scheduling algorithm at the boundary of the network. Furthermore, we propose some networks using RJPS (relative jitter packet scheduling) and WTP (waiting time priority) at different positions (core or egress) and a playout buffer delay adjustment algorithm (Concord algorithm) at the receiver. Finally we compare its performance in terms of normalized end-to-end delay with different loss probabilities at the playout buffer. Our first result showed that a proportional jitter DiffServ network achieves better performance while keeping the cost of implementation lower in some cases.

关键词： Jitter Diffserv networks Scheduling algorithm Quality of service Protocols Proposals computer science Processor scheduling Delay effects Performance loss

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Reliable message delivery for mobile agents: push or pull

Reliable message delivery for mobile agents: push or pull

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International Conference on Parallel and Distributed Systems (ICPADS)

作者： Jiannong Cao Xinyu Feng Jian Lu H. Chan S.K. Das Internet Computing and E-Commerce Lab Department of Computing Hong Kong Polytechnic University Kowloon Hong Kong China State Key Laboratory for Novel Software Technology Department of Computer Science Nanjing University Nanjing China Center for Research Wireless Mobility and Networking (CrewMan) Department of Computer Science and Engineering University of Technology Arlington TX USA

Two of the fundamental issues in message passing between mobile agents are tracking the migration of the target agent and delivering messages to it. In order to provide reliable message delivery, protocols are needed to overcome message loss caused by asynchronous operations of agent migration and message forwarding. In this paper, two message forwarding approaches, namely push and pull, are explored to design adaptive and reliable message delivery protocols. The pros and cons of these two approaches are evaluated, both qualitatively and quantitatively. The comparative performance evaluation is in terms of network traffic and delay in message processing. We also propose improvements to the pull approach to reduce network traffic and the message delay. We conclude that with different communication and migration patterns and requirements of real-time message processing, specific applications can select different message delivery approaches to achieve the desired level of performance and flexibility.

关键词： Mobile agents Target tracking Mobile communication Protocols computer science Telecommunication traffic Communication system security Relays Internet Laboratories

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Performance optimization of VoIP calls over wireless links using H.323 protocol

Performance optimization of VoIP calls over wireless links u...

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： S.K. Das E. Lee K. Basu N. Kakani S.K. Sen Center for Research in Wireless Mobility and Networking Arlington TX USA Department of Computer Science and Engineering University of Technology Arlington TX USA Nokia Research Center Irving TX USA Nortel Networks Limited Richardson TX USA

Intelligent mobile terminals (or users) of next generation wireless networks are expected to initiate voice over IP (VoIP) calls using session set-up protocols like H.323 or SIP (session initiation protocol). To guarantee service quality of such applications, the call set-up protocol should be robust against network impairment generated in wireless networks. In this paper, we analyze the performance of the H.323 call setup procedure over the wireless link. We used two call modes of operation for this analysis namely regular and fast connect. The proposed model assumes that a transparent radio link protocol (RLP), but without RLP retransmission, be used for VoIP packets while non-transparent (regular) RLP be used for H.323 control packets. Our analytical models prove that the VoIP call set-up performance can degrade significantly even for moderately high air-link frame error rates (FER). Furthermore, the call setup performance can be improved significantly using the robust radio link layer such as RLP with the modifications proposed in our paper. The analytical results were validated by our experimental measurements.

关键词： Optimization Wireless application protocol Wireless networks Robustness Radio link Intelligent networks Next generation networking Internet telephony Performance analysis Radio control

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A scalable QoS adaptation scheme for media servers 15

A scalable QoS adaptation scheme for media servers

引用

15th International Parallel and Distributed Processing Symposium, IPDPS 2001

作者： Striegel, A. Manimaran, G. Dependable Computing and Networking Laboratory Department of Electrical and Computer Engineering Iowa State University United States

ISBN: (纸本)0769509908

The issue of providing efficient media retrieval services has been an important problem in recent years. Among them, video-on-demand (VoD) is one of the most popular and challenging ones. An efficient solution to the VoD service problem should address the twin issues of scalability and client heterogeneity. In this paper, we propose a VoD server model, that is based on the parallel video server architecture and layered coding, to satisfy these twin issues. The proposed model dynamically adapts to the server load in order to maximize the number of clients (connections) admitted while maintaining a high quality for the already admitted connections. We study the adaptiveness our model by proposing promotion/demotion policies for quality adaptation. We also propose a performance metric, called marginal quality, that normalizes the quality (received) across heterogeneous connections. Finally, we evaluate the effectiveness of our model, in terms of connection acceptance rate, connection quality, and fairness in connection quality, through extensive simulation studies. © 2001 IEEE.

关键词： Video on demand

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Masking compressed video connection utilization in ATM networks

Masking compressed video connection utilization in ATM netwo...

引用

2001 IEEE International Symposium on Circuits and Systems, ISCAS 2001

作者： McEachen, John Cay, Abdullah Advanced Networking Laboratory Department of Electrical and Computer Engineering Naval Postgraduate School Monterey CA 93943 United States

ISBN: (纸本)0780366859

This paper examines the use of cell injection to change the observable characteristics of Variable Bit Rate (VBR) ATM connections most commonly used to transport compressed video. Cell Injection is a technique for masking Virtual Connection (VC) utilization in ATM networks from undesired third parties by altering the flow of traffic over the connection. We model the cell injection process as a Markov Modulated Poisson Process (MMPP) and discuss both the theoretical and applied aspects of the cell injection approach. Aggregate bounds for sustained cell rate (SCR) and mean burst size (MBS) are derived using the Cruz bound. Analytic results are compared with measurements of real cell-injected ATM traffic and the effects of injection on the original traffic are summarized. The results demonstrate that VBR characteristics can be effectively masked within reason. Further, an interesting side effect is that cell injection shifts the power in the mid and high frequency regions towards low frequency regions, which is the dominant factor in queue length distributions. © 2001 IEEE.

关键词： Asynchronous transfer mode

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SSD: An affordable fault tolerant architecture for superscalar processors

SSD: An affordable fault tolerant architecture for superscal...

引用

Pacific Rim International Symposium on Dependable Computing, PRDC 2001

作者： Kim, Seongwoo Somani, Arun K. Dependable Computing and Networking Laboratory Department of Electrical and Computer Engineering Iowa State University AmesIA50011 United States

ISBN: (纸本)0769514146

This paper proposes an integrity checking architecture for superscalar processors that can achieve fault tolerance capability of a duplex system at much less cost than the traditional duplication approach. The pipeline of the CPU core (P-pipeline) is combined in series with another pipeline (V-pipeline), which re-executes instructions processed in the P-pipeline. Operations in the two pipelines are compared and any mismatch triggers recovery process. The V-pipeline design is based on replication of the P-pipeline, and minimized in size and functionality by taking advantage of control flow and data dependency resolved in the P-pipeline. Idle cycles propagated from the P-pipeline become extra time for the V-pipeline to keep up with program re-execution. For a large-scale superscalar processor, the proposed architecture can bring up to 61.4% reduction in die area and the average execution time increase is 0.3%. © 2001 IEEE.

关键词： Pipelines

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IP traffic monitoring: An overview and future considerations 2nd

引用

2nd IEEE Pacific-Rim Conference on Multimedia, IEEE-PCM 2001

作者： Wei, Dong Ansari, Nirwan Advanced Networking Lab Department of Electrical and Computer Engineering New Jersey Institute of Technology University Heights NewarkNJ07102 United States

ISBN: (纸本)3540426809

An overview on emerging IP traffic monitoring is presented. Important parameters to characterize the traffic, network and QoS, are discussed. The infrastructure and methodology to measure those parameters directly or to compute them based on other measurements are described. We also present a discourse on coping with the challenge of new transport architectures and technologies. In summary, a framework of IP traffic monitoring is presented. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Parameter estimation

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Design and implementation of an intelligent web-based interactive language learning system

Design and implementation of an intelligent web-based intera...

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2001 IEEE International Conference on Multimedia and Expo, ICME 2001

作者： Kuo, Chin-Hwa Wible, David Chen, Meng-Chang Sung, Li-Chun Tsao, Nai-Lung Chio, Chia-Lin Computers and Networking Laboratory Department of Computer Science and Information Engineering Tamkang University Taiwan Graduate Institute of Western Languages and Literature Tamkang University Taiwan Institute of Information Science Academia Sinica Taiwan

ISBN: (纸本)0769511988

The design and implementation of an Intelligent Web-based Interactive Language Learning (IWiLL) system to support English learning on the Internet is described. We designed two kinds of learning environments: (1) interactive English writing environment and (2) mining movies for real English. These are intended to improve learners' basic language skills such as listening, reading, and writing. In addition, the system also offers authoring tools that facilitate teachers' content preparation. The system not only provides multimedia learning environments for users, but also builds a learner corpus, an archive of annotated English texts written by learners for whom English is a second language. Further analysis of the learner corpus creates the potential to detect the users' persistent errors and then provide adequate help to the users.

关键词： computer aided instruction

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