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IEEE Symposium on Network Operations and Management

作者： M. Debusmann M. Schmid R. Kroeger Department of Computer Science Distributed Systems Laboratory Fachhochschule Stralsund University of Applied Sciences Wiesbaden Germany

Enterprise Java Bean (EJB) application servers are gaining more and more importance for implementing business-critical applications. For an effective service-level management (SLM), an instrumentation must offer a fine-grained picture of the real system performance. For reasons of efficiency and practicability, the instrumentation has to be performed automatically in order to assure complete and comparable measurements. This paper presents a new approach for an automatic and generic performance instrumentation of EJB applications by instrumenting the EJB server. The approach defines a generic CIM model for EJB applications. From an application developer's point of view, the instrumentation is completely transparent. It is realised using the Java Management Extensions (JMX). The performance measurements are implemented using Application Response Measurement (ARM). The prototype is integrated into a WBEM/CIM object manager.

关键词： Instruments Application software Java computer integrated manufacturing Monitoring Delay Web server Logic Information management Sun

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Working set based location management scheme for mobile computing environments

Working set based location management scheme for mobile comp...

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IEEE International Conference on High Speed Networks and Multimedia Communications

作者： Moon Seog Han Seong Bin Im Young Ik Eom Department of Administration and Computer Science Wonju National Wonju Gangwon South Korea LogicForce Inc. Seoul South Korea Distributed Systems Laboratory School of Information and Communication Engineering Sungkyunkwan University Suwon Gyeonggi South Korea

Research activities for combining portable computer technology and wireless communication technology are in progress to realize mobile computing environments. Among the various strategies necessary for mobile computing environments, the location management strategies are particularly emphasized especially for PCN environments. Location management strategy-for PCN environments, which is mostly based on the IS-41 standards, brings an issue that additional network traffic are generated to deliver update messages to the home location server whenever a mobile host changes its location server. We propose an innovative update strategy and a search strategy that resolves the problem shown in the IS-41 scheme. Also, this paper compares the performance of the proposed scheme with the IS-41-based scheme.

关键词： Environmental management Mobile computing Portable computers Personal communication networks Communications technology computer networks Frequency distributed computing Mobile communication Wireless communication

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Improved Relevance Ranking in WebGather

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Journal of computer science & Technology 2001年第5期16卷 410-417页

作者：雷鸣王建勇陈葆珏李晓明 Networking & Distributed Computer Systems Laboratory Department of Computer Science & Technology Peking University Beijing P. R. China

The amount of information on the web is growing rapidly and search engines that rely on keyword matching usually return too many fow quality matches. To improve search results, a challenging task for search engines is how to effectively calculate a relevane ranking for each web page. This paper discusses in what order a search engine should return the URLs it has produced in response to a user's query so as to show more relevant pages first. Emphasis is given on the ranking functions a-dopted by WebGather that take link structure and user popularity factors into account. Bxperimental results are also presented to evaluate the proposed strategy.

关键词： World Wide Web search engine relevance ranking WebGather

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Preface

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2002年 2468卷

作者： Plaice, John Kropf, Peter Schulthess, Peter Slonim, Jacob University of New South Wales School of Computer Science and Engineering SydneyNSW Australia University of Montreal Department of Computer Science and Operations Research C.P. 6128 succ. Centre-Ville MontrealQC Canada University of Ulm Distributed Systems Laboratory James Frank Ring 0-27 Ulm Germany Dalhousie University 6050 University Avenue HalifaxNS Canada

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Using JIT compilation and configurable runtime systems for efficient deployment of java programs on ubiquitous devices

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International Conference on Ubiquitous Computing, Ubicomp 2001

作者： Teodorescu, Radu Pandey, Raju Parallel and Distributed Computing Laboratory Computer Science Department University of California Davis United States

ISBN: (纸本)3540426140

As the proliferation of ubiquitous devices moves computation away from the conventional desktop computer boundaries, distributed systems design is being exposed to new challenges. A distributed system supporting a ubiquitous computing application must deal with a wider spectrum of hardware architectures featuring structural and functional differences, and resources limitations. Due to its architecture independent infrastructure and object-oriented programming model, the Java programming environment can support flexible solutions for addressing the diversity among these devices. Unfortunately, Java solutions are often associated with high costs in terms of resource consumption, which limits the range of devices that can benefit from this approach. In this paper, we present an architecture that deals with the cost and complexity of running Java programs by partitioning the process of Java program execution between system nodes and remote devices. The system nodes prepare a Java application for execution on a remote device by generating device-specific native code and application-specific runtime system on the fly. The resulting infrastructure provides the flexibility of a high-level programming model and the architecture independence specific to Java. At the same time the amount of resources consumed by an application on the targeted device are comparable to that of a native implementation. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Object oriented programming

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Markovian models for performance and dependability evaluation 1st

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1st EEF/Euro Summer School on Formal Methods and Performance Analysis, FMPA2000

作者： Haverkort, Boudewijn R. Laboratory for Performance Evaluation and Distributed Systems Department of Computer Science RWTH Aachen Aachen52056 Germany

ISBN: (纸本)3540424792

Markovian models have been used for about a century now for the evaluation of the performance and dependability of computer and communication systems. In this paper, we give a concise overview of the most widely used classes of Markovian models, their solution and application. After a brief introduction to performance and dependability evaluation in general, we introduce discrete-time Markov chains, continuous-time Markov chains and semi-Markov chains. Stepwisely, we develop the main equations that govern the steady-state and the transient behaviour of such Markov chains. We thereby emphasise on intuitively appealing explanations rather than on mathematical rigor. The relation between the various Markov chain types is explained in detail. Then, we discuss means to numerically solve the systems of linear equations (both direct and iterative ones) and the systems of differential equations that arise when solving for the steady-state and transient behaviour of Markovian models. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Differential equations

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Using max-plus algebra for the evaluation of stochastic process algebra prefixes 1st

Using max-plus algebra for the evaluation of stochastic proc...

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1st Joint International Workshop on Process Algebras and Performance Modeling and Probabilistic Methods in Verification, PAPM-PROBMIV 2001

作者： Cloth, Lucia Bohnenkamp, Henrik Haverkort, Boudewijn Department of Computer Science Laboratory for Performance Evaluation and Distributed Systems RWTH Aachen AachenD-52056 Germany

ISBN: (纸本)354042556X

In this paper, the concept of complete finite prefixes for process algebra expressions is extended to stochastic models. Events are supposed to happen after a delay that is determined by random variables assigned to the preceding conditions. Max-plus algebra expressions are shown to provide an elegant notation for stochastic prefixes not containing any decisions. Furthermore, they allow for the computation of performance measures. The derivation of the so called k-th occurrence times is shown in detail. © Springer-Verlag Berlin Heidelberg 2001

关键词： Stochastic models

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Performance comparison and analysis of ad hoc routing algorithms

Performance comparison and analysis of ad hoc routing algori...

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IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： A. Boukerche Parallel Simulation and Distributed Systems Research Laboratory Department of Computer Science University of North Texas USA

ISBN: (纸本)0780370015

A mobile ad-hoc network (Manet) is a system of wireless mobile nodes dynamically self-organizing in arbitrary and temporary network topologies. People and vehicles can thus be internetworked in areas without a pre-existing communication infrastructure, or when the use of such infrastructure requires wireless extension. Therefore, such networks are designed to operate in widely varying environments, from military networks to low-power sensor networks and other embedded systems. Frequent topology changes caused by node mobility make routing in ad hoc wireless networks a challenging problem. We focus upon routing protocols for ad hoc networks. We study and compare the performance of several routing protocols. A variety of workload and scenarios using a variety of mobility, load and size of the ad hoc network were simulated.

关键词： Performance analysis Algorithm design and analysis Ad hoc networks Network topology Routing protocols Vehicles Internet Mobile communication Wireless sensor networks Sensor systems

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A distributed synchronization scheme for multimedia streams in mobile systems: proof and correctness

A distributed synchronization scheme for multimedia streams ...

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Conference on Local computer Networks (LCN)

作者： A. Boukerche Sungbum Hong T. Jacob Parallel Simulation and Distributed Systems (PARADISE) Research Laboratory Department of Computer Science University of North Texas USA

ISBN: (纸本)0769513212

The rapid development in portable computing platforms, distributed multimedia systems and wireless communication technologies has led to a significant interest in mobile multimedia and wireless networking. Video entertainment and multimedia Internet access over wireless networks are examples of future wireless personal communication systems. These, however, incur challenging technological issues. The synchronization of the multimedia objects among mobile clients is one of the most important of these issues. The task of synchronization in wireless multimedia systems is to eliminate variations and delays incurred during the transmission of multiple-media streams and to maintain the temporal order among the various media streams. We propose an efficient distributed multimedia synchronization algorithm for wireless and mobile multimedia systems to ensure and facilitate mobile clients' access to multimedia objects. We discuss the algorithm and provide its formal proof and correctness.

关键词： Streaming media Multimedia systems Wireless communication computer networks distributed computing Portable computers Communications technology Mobile computing Multimedia computing IP networks

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Performance comparison of data distribution management strategies 01

Performance comparison of data distribution management strat...

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International Workshop/Symposium on distributed Simulation and Real-Time Applications (DS-RT)

作者： A. Boukerche C. Dzermajko Parallel Simulation and Distributed Systems PARADISE Research Laboratory Department of Computer Science University of North Texas USA

Abstract: Data Distribution Management (DDM) is a High Level Architecture/Run-time Infrastructure (HLA/RTI) service that manages the distribution of state updates and interaction information in large scale distributed simulations, limits and controls the volume of data exchanged during the simulation. In this paper we focus upon the following three DDM schemes: Region-Based, Fixed and Dynamic Grid-Based techniques. In an effort to determine the most efficient model for applying the DDM service, we developed a mini-RTI Kit framework and propose a set of benchmarks to compare these DDM schemes. Using the RTI Kit, we performed extensive simulation experiments and present our analysis of the results of numerous federation executions.

关键词： distributed decision making Computational modeling computer simulation Discrete event simulation Subscriptions Filtering computer science Large-scale systems Analytical models Performance analysis

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