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IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： Tao Meng Hongfei Yan Jimin Wang Xiaoming Li Computer Networks and Distributed Systems Laboratory Department of Computer Science and Technology Peking University Beijing China

ISBN: (纸本)9780769521008

It is important for an incremental crawler to know how web pages evolve and the relation between their changing frequencies and the link-attributes such as indegrees. This paper proposes a model for incremental crawling and performs an experiment to verify the correlation between them, by monitoring the evolution of all the link-attributes of the web pages within one website. Particularly, we look deeply into one special kind of page named Index-pages. From the experiment, we can make four conclusions: (1) Pages which have bigger indegrees, outdegrees or PageRank values change more often, and these link-attributes all approximately obey a power-law distribution. (2) The link-attributes of pages seldom change though the pages change themselves. (3) A small proportion of the pages link to most of the vertexes in the web graph. (4) The Index-pages link to sizeable new pages in a website. These conclusions can be used to greatly enhance the performance of an incremental crawler, which is the foremost component for general search engines and web information stores.

关键词： Crawlers Web pages Frequency computer networks Laboratories computer science Monitoring Search engines Internet World Wide Web

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Decentralized resilient grid resource management overlay networks

Decentralized resilient grid resource management overlay net...

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Proceedings - 2004 IEEE International Conference on Services Computing, SCC 2004

作者： Huang, Yangcheng Bhatti, Saleem N. Networks Research Group Department of Computer Science University College London Gower Street London WC1E 6BT United Kingdom

ISBN: (纸本)0769522254

Recently, Grid and peer-to-peer overlays have attracted attention from research communities as well as industry. However, the overwhelming majority of industrial, commercial and academic activities are geared around applications, servers, and middleware. There have been some efforts in the management of the underlying networks (the connectivity for the overlays), but far from enough. This paper proposes a resilient, fault-adaptive, overlay resource management framework, with lightweight state management infrastructure, taken from some ongoing work by the authors in this area. This research aims to solve the problems of: (a) managing distributed network resources in a decentralized way;(b) providing resilient QoS for highly dynamic networks.

关键词： computer networks

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An evaluation of aspect-oriented programming for Java-based real-time systems development

An evaluation of aspect-oriented programming for Java-based ...

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International Symposium on Object-Oriented Real-Time distributed Computing

作者： Shiu Lun Tsang S. Clarke E. Baniassad Distributed Systems Group Department of Computer Science Trinity College Dublin Dublin Ireland

Some concerns, such as debugging or logging functionality, cannot be captured cleanly, and are often tangled and scattered throughout the code base. These concerns are called crosscutting concerns. Aspect-oriented programming (AOP) is a paradigm that enables developers to capture crosscutting concerns in separate aspect modules. The use of aspects has been shown to improve understandability and maintainability of systems. It has been shown that real-time concerns, such as memory management and thread scheduling, are crosscutting concerns [A. Corsaro et al., (2002), *** et al., (2001), A. Gal et al., (2002)]. However it is unclear whether encapsulating these concerns provides benefits. We were interested in determining whether using AOP to encapsulate real-time crosscutting concerns afforded benefits in system properties such as understandability and maintainability. This paper presents research comparing the system properties of two systems: a real-time sentient traffic simulator and its aspect-oriented equivalent. An evaluation of AOP is presented indicating both benefits and drawbacks with this approach

关键词： Java Real time systems Scattering Debugging Traffic control System testing Domain specific languages Object oriented modeling computer science Educational institutions

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XRTJ: An extensible distributed high-integrity real-time java environment

XRTJ: An extensible distributed high-integrity real-time jav...

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9th International Conference on Real-Time and Embedded Computing systems and Applications, RTCSA 2003

作者： Hu, Erik Yu-Shing Wellings, Andy Bernat, Guillem Real-Time Systems Research Group Department of Computer Science University of York YorkYO105DD United Kingdom

ISBN: (纸本)9783540246862

Despite Java's initial promise of providing a reliable and cost-effective platform-independent environment, the language appears to be unfavourable in the area of high-integrity systems and real-time systems. To encourage the use of Java in the development of distributed high-integrity real-time systems, the language environment must provide not only a well-defined specification or subset, but also a complete environment with appropriate analysis tools. We propose an extensible distributed high-integrity real-time Java environment, called XRTJ, that supports three attributes, i.e., predictable programming model, dependable static analysis environment, and reliable distributed run-time environment. The goal of this paper is to present an overview of our on-going project and report on its current status. We also raise some important issues in the area of distributed high-integrity systems, and present how we can deal with them by defining two distributed run-time models where safe and timely operations will be supported. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Real time systems

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Performance analysis of cryptographic protocols on handheld devices

Performance analysis of cryptographic protocols on handheld ...

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IEEE International Symposium on Network Computing and Applications

作者： P.G. Argyroudis R. Verma H. Tewari D. O'Mahony Networks and Telecommunications Research Group Department of Computer Science University of Dublin Trinity College Ireland Networks and Telecommunications Research Group Department of Computer Science University of Dublin Trinity College

The past few years have witnessed an explosive growth in the use of wireless mobile handheld devices as the enabling technology for accessing Internet-based services, as well as for personal communication needs in ad hoc networking environments. Most studies indicate that it is impossible to utilize strong cryptographic functions for implementing security protocols on handheld devices. Our work refutes this. Specifically, we present a performance analysis focused on three of the most commonly used security protocols for networking applications, namely SSL, S/MIME and IPsec. Our results show that the time taken to perform cryptographic functions is small enough not to significantly impact real-time mobile transactions and that there is no obstacle to the use of quite sophisticated cryptographic protocols on handheld mobile devices.

关键词： Performance analysis Cryptographic protocols Handheld computers Personal digital assistants Public key cryptography Communication system security Mobile computing Mobile communication Workstations Electronic commerce

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Decentralized resilient grid resource management overlay networks

Decentralized resilient grid resource management overlay net...

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IEEE International Conference on Services Computing (SCC)

作者： Yangcheng Huang S.N. Bhatti Networks Research Group Department of Computer Science University College London London UK

Recently, grid and peer-to-peer overlays have attracted attention from research communities as well as industry. However, the overwhelming majority of industrial, commercial and academic activities are geared around applications, servers, and middleware. There have been some efforts in the management of the underlying networks (the connectivity for the overlays), but far from enough. This paper proposes a resilient, fault-adaptive, overlay resource management framework, with lightweight state management infrastructure, taken from some ongoing work by the authors in this area. This research aims to solve the problems of: (a) managing distributed network resources in a decentralized way; (b) providing resilient QoS for highly dynamic networks.

关键词： Resource management Quality of service Peer to peer computing computer network management Information management Scalability computer architecture computer networks computer science Educational institutions

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Scalable signaling underlay for overlay networks

Scalable signaling underlay for overlay networks

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IEEE International Conference on networks

作者： Y. Huang S.N. Bhatti Networks Research Group Department of Computer Science University College London London UK

This paper presents the design of a scalable decentralized signaling underlay infrastructure, which features a DHT based management information storage and query-based state lookup mechanism. The signaling underlay is aimed to apply a decentralized "peer-to-peer" style searching and discovering engine into the management and control plane of the overlay network, including grid networks and p2p applications, to facilitate deployment of QoS service.

关键词： Signal design Peer to peer computing Information management Search engines Resource management computer science Educational institutions computer network management Scalability Lighting control

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A peer-to-peer mechanism for resource location and allocation over the grid 04

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Proceedings of the Second international conference on Parallel and distributed Processing and Applications

作者： Hung-Chang Hsiao Mark Baker Chung-Ta King Computer and Communication Research Center National Tsing-Hua University Taiwan The Distributed Systems Group University of Portsmouth UK Department of Computer Science National Tsing-Hua University Taiwan

ISBN: (纸本)9783540241287

Recent advances in P2P lookup overlays provide an appealing solution for distributed search without relying on a single database server. In addition to performing resource discovery, these P2P substrates also offer membership management for dynamic peers. In this paper, we propose a publicly shared architecture called VC2A that takes advantage of a P2P lookup substrate for computational applications. VC2A targets computational master-slave applications. An application running in VC2A dynamically allocates resources from the system on the fly. These allocated resources then self-manage and -heal. We have implemented an architecture based on our previous efforts that include an enhanced P2P lookup overlay and a mobile agent system on top of this overlay. We show that VC2A is not only scalable but robust, and takes advantage of heterogeneity of the resources.

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Generic Environment for Full Automation of Benchmarking 1

Generic Environment for Full Automation of Benchmarking

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Testing of Component-Based systems and Software Quality, 1st International Workshop on Software Quality, SOQUA 2004 and Workshop Testing Component-Based systems, TECOS 2004

作者： Kalibera, Tomáš Bulej, Lubomír Tůma, Petr Distributed Systems Research Group Department of Software Engineering Faculty of Mathematics and Physics Charles University Malostranské nám. 25 Prague118 00 Czech Republic Institute of Computer Science Czech Academy of Sciences Pod Vodárenskou věží 2 Prague182 07 Czech Republic

ISBN: (纸本)3885793873

Regression testing is an important part of software quality assurance. We work to extend regression testing to include regression benchmarking, which applies benchmarking to detect regressions in performance. Given the specific requirements of regression benchmarking, many contemporary benchmarks are not directly usable in regression benchmarking. To overcome this, we present a case for designing a generic benchmarking environment that will facilitate the use of contemporary benchmarks in regression benchmarking, analyze the requirements and propose architecture of such an environment. © 2004 Gesellschaft fur Informatik (GI). All rights reserved.

关键词： Benchmarking

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A peer-to-peer mechanism for resource location and allocation over the grid

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) 2004年 3358卷 604-614页

作者： Hsiao, Hung-Chang Baker, Mark King, Chung-Ta Computer and Communication Research Center National Tsing-Hua University 300 Taiwan Distributed Systems Group University of Portsmouth PO1 2EG United Kingdom Department of Computer Science National Tsing-Hua University 300 Taiwan

关键词： Substrates

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