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

作者： M. Scheidegger T. Braun Department of Computer Networks and Distributed Systems Institute of Computer Science and Applied Mathematics University of Bern Bern Switzerland

ISBN: (纸本)0780373715

This paper describes a concept based on application adaptivity and Differentiated Services (DiffServ) in order to provide the quality-of-service (QoS) required by real-time applications. Assuming the availability of different service classes, we propose that a real-time application always selects the lowest/cheapest service class that still can meet the application requirements. The selection depends on RTP-based QoS monitoring and on additional probing of the quality of the next lower service class. The service class selection algorithm has been implemented within an IP telephony application and evaluated in a test-bed consisting of Linux-PC based DiffServ routers. The evaluation proves the suitability of the approach but also shows several issues for further improvement.

关键词： Telephony Quality of service Application software Diffserv networks Monitoring Feedback Switches Costs Telecommunication traffic computer networks

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A dynamic reconfiguration model for a distributed web crawling system

A dynamic reconfiguration model for a distributed web crawli...

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International Conference on computer networks and Mobile Computing (ICCNMC)

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

A web crawling system employing a parallel and distributed architecture needs to have a mechanism to bring the whole system in a coordinated state when the nodes are added to or removed from the system. This paper presents an efficient dynamic reconfiguration model that can be used in such a system. The study shows that this model leads to some nice properties, such as load balance and low traffic in the system, which contribute to high performance. Currently this model is being implemented in WebGather, a well-known Chinese and English web search engine.

关键词： Service oriented architecture Search engines Crawlers computer networks Laboratories computer science computer architecture Web search Telecommunication traffic Traffic control

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Independent proprietorship and competition in distributed Web search architectures

Independent proprietorship and competition in distributed We...

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IEEE International Conference on Engineering of Complex computer systems

作者： R. Khoussainov T. O'Meara A. Patel Computer Networks and Distributed Systems Research Group University College Dublin Belfield Dublin 4 Ireland

ISBN: (纸本)0769511597

The predominant Web search model attempts to use multiple computers under centralised management to act as one search engine for the entire Web. As the quantity of online information increases, systems based on this model become prohibitively expensive for all but the largest organisations. We advocate the use of distributed search architectures where multiple independently owned and managed search engines act as one search system. This approach has significant advantages including low market entry cost for individual search providers and the potential to stimulate the provision of high-quality services through competition. The low entry cost allows small organisations and even individual users to influence service features and quality by establishing specialised search services. However, independent proprietorship also greatly complicates the search system design. The potential for competition between engines requires new approaches to effective engine management Many new issues arise such as deciding what information an engine will index. In this paper we analyse the sources of complexity in distributed Web search architectures with independent proprietorship and competition between engines. We outline possible ways to cope with this complexity using techniques from the field of computational economics such as game theory.

关键词： Web search Service oriented architecture Search engines computer architecture Costs Databases computer network management Centralized control Intelligent networks computer science

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A scalable membership service for group communications in WANs

A scalable membership service for group communications in WA...

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Pacific Rim International Symposium on Dependable Computing

作者： Kim, H Lee, D Youn, HY Collaborative Distributed Systems and Networks Laboratory Information and Communications University South Korea School of Electrical and Computer Engg. Sungkyunkwan University South Korea

ISBN: (纸本)0769509754

Group Communication System (GCS) is an important building block for reliable, fault-tolerant distributed applications. Due to highly variable and unpredictable latency in WANs, GCS needs to cope with frequent membership, changes. It results in diminishing the scalability of GCS. In this paper we propose a new scheme that improves the scalability of group membership service for WANs by exploring dedicated membership sewers configured into multiple layers and reaching global agreement on the view through layered servers. It improves the scalability of a process group of N member processes front O(N-2) to O(N-3) with three layers, where N is the number of processes in the group. computer simulation verifies that the proposed scheme requires much smaller number of message exchanges for reaching an agreement on a next view and does that much quicker. In addition, the proposed scheme pl events applications from being blocked until reaching the final view agreement if the applications permit temporary inconsistency.

关键词： Application software Collaboration computer networks Delay Intelligent networks Laboratories Maintenance Scalability Web server Wide area networks

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A scalable membership service for group communications in WANs

A scalable membership service for group communications in WA...

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Pacific Rim International Symposium on Dependable Computing

作者： Heejeong Kim Dongman Lee Hee Yong Youn Collaborative Distributed Systems & Networks Laboratory Information and Communications University South Korea School of Electrical & Computer Engineering Sungkyunkwan University South Korea

Group Communication System (GCS) is an important building block for reliable, fault-tolerant distributed applications. Due to highly variable and unpredictable latency in WANs, GCS needs to cope with frequent membership changes. It results in diminishing the scalability of GCS. In this paper we propose a new scheme that improves the scalability of group membership service for WANs by exploiting dedicated membership servers configured into multiple layers and reaching global agreement on the view through layered servers. It improves the scalability of a process group of N member processes from O(N/sup 2/) to O(N/sup 3/) with three layers, where N is the number of processes in the group. computer simulation verifies that the proposed scheme requires much smaller number of message exchanges for reaching an agreement on a next view and does that much quicker. In addition, the proposed scheme prevents applications from being blocked until reaching the final view agreement if the applications permit temporary inconsistency.

关键词： Wide area networks Scalability Delay Application software Web server computer networks Maintenance Intelligent networks Collaboration Laboratories

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Requirements and the concept of cooperative system management

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International Journal of Network Management 1998年第3期8卷 139-158页

作者： Bhushan, Bharat Patel, Ahmed Computer Networks and Distributed Systems Research Group Department of Computer Science University College Dublin Belfield Dublin 4 Ireland.

Cooperation among various types of management functions is necessary to allow management functions to interwork in providing and using information services for systems management. To understand these tasks from the point of view of cooperative working, this article discusses the requirements and presents the concept of cooperative system management.

关键词： Management information systems

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Design and Implementation of an SNMPv2 Management System for MS-DOS/Novell NetWare and Unix-TCP/IP

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International Journal of Network Management 1998年第3期7卷

作者： Ahmed Patel Stephen Morris Computer Networks and Distributed Systems Research Group Department of Computer Science University College Dublin Belfield Dublin 4 Ireland

SNMPv2 management tools for networks based on Novell NetWare and TCP/IP facilitate management of individual network workstations which allows a very detailed description of the network operation to be constructed. Using this, management can then be achieved across both the full range of NetWare workstation software versions and Unix-TCP/IP nodes. © 1997 John Wiley & Sons, Ltd.

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A functional model of cooperative system management

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International Journal of Network Management 1998年第3期8卷

作者： Bharat Bhushan Ahmed Patel Computer Networks and Distributed Systems Research Group Department of Computer Science University College Dublin Belfield Dublin 4 Ireland.

There is a need for information exchange and communication between management applications that are distributed over a large system. In this situation, a fundamental problem is how the management systems should cooperate in order to achieve overall management of a system. In order to address this problem, this article presents a functional model of cooperative system management. © 1998 John Wiley & Sons, Ltd.

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A timestamp model for determining real-time communications in intelligent networks

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computer COMMUNICATIONS 1997年第4期20卷 211-218页

作者： Patel, A OConnell, S Computer Networks and Distributed Systems Research Group Department of Computer Science University College Dublin Dublin 4 Ireland

The provision of services such as credit card facilities using Intelligent networks (IN) depends upon the ability to process real-time data. If their data is deliberately delayed during transit, these services may not be able to function accurately. This paper examines INs and highlights their vulnerability to network delay attacks. In particular, the nature of rear-time communications and the main approach that has been developed to determine whether received data is being sent in real-time or not is discussed. The deficiencies in this approach in terms of its ability to counteract the different forms of a network delay attack are highlighted and an alternative method which addresses these drawbacks is presented. Finally, the results achieved following the implementation and subsequent testing of the alternative approach are discussed. (C) 1997 Elsevier Science B.V.

关键词： real-time communications IN network delay attack clock synchronisation

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Performance analysis of an HDLC-based protocol with data compression

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computer COMMUNICATIONS 1997年第7期20卷 567-575页

作者： Ruplitsch, M Patel, A Computer Networks and Distributed Systems Research Group Department of Computer Science University College Dublin Belfield Dublin 4 Ireland

Several international standards for asynchronous data compression are available today. In 1993 the International Telecommunication Union (ITU) started to research possible ways to compress synchronous data. Special attention was given to compatibility with previous asynchronous standards, namely V.42bis. In September 1993 a proposal for modification of the V.42bis standard to make ii applicable to synchronous data was published. In this paper a prototype of a synchronous data link layer protocol based on the ITU proposals is described. The protocol chosen is HDLC based. The V.42bis compression standard is adapted to serve the needs of a synchronous protocol. A functional model is designed followed by a performance analysis of the protocol. The analysis shows a decrease of the compression ratio due to the adaption of the compression algorithm. (C) 1997 Elsevier Science B.V.

关键词： data compression HDLC data link LAP error correction

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