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International Conference on Advances in System Simulation, SIMUL

作者： Huaizhou Yang Zengzhi Li State key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China Institute of Computer Architecture & Networks Xi'an Jiaotong University Xi'an China

The Web services composition system usually has restricted resources in many practical applications. The system performance is closely related to the system resource. Firstly, a basic generalized stochastic Petri net model, constructed via service composition plan or language mapping for the purpose of performance presented. Nevertheless, the basic model can not reflect the characteristics of system resource restriction exactly. Therefore, through analyzing the various resource restrictions in Web services composition system, a series of extended modeling rules and methods are presented in order to acquire exact performance analysis results. The experiments indicate the difference of performance analysis results between basic model in ideal situation and extended model with restricted resources.

关键词： Web services Performance analysis Petri nets Stochastic processes Service oriented architecture Laboratories Telecommunication switching System performance Artificial intelligence System recovery

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Smallest Enclosing Circle Based Localization Approach for Wireless Sensor networks

Smallest Enclosing Circle Based Localization Approach for Wi...

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WRI International Conference on Communications and Mobile Computing, CMC

作者： Quan Zhou Xiaowei Li Yongjun Xu Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy and Sciences Beijing China Laboratory of Sensor Networks Institute of Computing Technology Chinese Academy and Sciences Beijing China

A novel range-free localization approach, smallest enclosing Circle based Localization (SECL), has been proposed. This approach uses the center of smallest enclosing circle of neighboring anchor nodes to estimate the position of target. Comparing to centroid, SECL considers the geometrical coverage of anchors rather than the mass center of them. Consequently, SECL is robust to imperfect topology, especially when the topology of anchors is depolyed unevenly. Simulation results show that SECL outperforms Centroid by an average of 10%, and even better when the topology is not uniform.

关键词： Wireless sensor networks Network topology computer networks Laboratories Robustness Computational modeling Equations Hardware Mobile communication Mobile computing

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A feedback-aware binding component

A feedback-aware binding component

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1st Internet of Services Doctoral Symposium 2008 - At International Conference on Interoperability of Enterprise Systems and Applications, I-ESA 2008

作者： Strunk, Anja Technical University of Dresden Institute of Systems Architecture Department of Computer Networks 01063 Dresden Germany

The QoS-aware web service composition is an important topic that is intensively discussed in the last ten years. The approach of Canfora, for example, solves this problem in an acceptable time period. The lack of most of the approaches for a QoS-aware composition is, however, that they completely ignore monitoring and user feedback for single web services. In this paper the idea of taking monitoring and user feedback into account while composing web services will be introduced.

关键词： Web services

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A service-oriented approach for increasing flexibility in manufacturing

A service-oriented approach for increasing flexibility in ma...

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IEEE International Workshop on Factory Communication Systems (WFCS)

作者： Christin Groba Iris Braun Thomas Springer Martin Wollschlaeger Institute for Systems Architecture Computer Networks Group Technische Universität Germany Institute for Applied Computer Science Industrial Communications Group Technische Universität Germany

Manufacturing environments are characterized by a multitude of heterogeneous devices, networks, specific protocols and applications. Therefore, static structures, close coupling and vendor-specific solutions have been established over decades. To increase flexibility and interoperability we introduce a service-oriented middleware approach in form of an integration layer between shop-floor equipment and enterprise applications. The integration layer addresses the actual capabilities and data flows on the field and control layer individually. It offers core services that are applicable in several manufacturing domains. We describe a detailed case study to discuss pros and cons of a SOA approach in manufacturing systems and to show the feasibility of our approach.

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Design and Implementation of QoS Management and the Reduction of Evaluation Indexes

Design and Implementation of QoS Management and the Reductio...

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International Symposium on Knowledge Acquisition and Modeling, KAM

作者： Haping Zhu Yunlan Wang Zengzhi Li Hong Xia Institute of Computer Architecture and Networks Xi'an Jiaotong University Xi'an China Center for High Performance Computing Northwestern Polytechnical University Xi'an China

The basic purpose of QoS management is to provide differentiated services and quality guarantee for users. Then how to evaluate the services provided by the system is very important. In the paper, a multi-level QoS management and evaluation architecture for network services is proposed, which supported adjustable selection and reconfiguration of QoS evaluation indexes. With the number of evaluation indexes increasing, eliminating the correlation between indexes is a key issue before QoS evaluation. Reference to Dijkstra shortest path algorithm, a dynamic index reduction algorithm is proposed. To eliminate the correlation of synthetic indexes is to get a set of indexes which the correlation degree is minimum. Examples show that the more indexes, the more efficient the dynamic algorithm can be.

关键词： Quality of service computer network management Heuristic algorithms Partitioning algorithms Knowledge management Quality management computer architecture Knowledge acquisition High performance computing Source separation

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Attack and improve of a group signature scheme based on Chinese remainder theorem

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Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology 2007年第1期29卷 182-184页

作者： Wang, Feng-He Hu, Yu-Pu Wang, Chun-Xiao Key Lab. of Computer Networks and Information Security Xidian University Xi'an 710071 China Dept. of Mathematics Taishan Collage Taian 271000 China Dept. of Math. and Phys. Shandong Institute of Architecture and Engineering Jinan 250014 China

An attack is mounted on a group signature ncncmc bnscd on Cliincso Remainder Theory (Chen-Scheme). It shows the Chen-Scheme is insecure: A colluding subset of group members can find the private key of other members and forge their signatures;The dishonest group center can produce a valid signature un behalf of group members. Using Schnorr signature scheme this paper proposes an improve scheme, which has good characteristics: A colluding subset of group members can not produce a valid signature that the group manager can not open;A dishonest group center can not sign messages on behalf of other members;The revocation of the membership is efficient.

关键词： Cryptography

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An Efficient Pricing Based Protocol for Broadcasting in Wireless Ad hoc networks

An Efficient Pricing Based Protocol for Broadcasting in Wire...

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International Conference on Communication Systems Software and Middleware (COMSWARE)

作者： N.R. Suri Y. Narahari D. Manjunath Department of Computer Science and Automation Indian Institute of Science Bangalore India Networks Architecture Laboratory Electrical and Communications Engineering Indian Institute of Science Bangalore India

In many applications of wireless ad hoc networks, wireless nodes are owned by rational and intelligent users. In this paper, we call nodes selfish if they are owned by independent users and their only objective is to maximize their individual goals. In such situations, it may not be possible to use the existing protocols for wireless ad hoc networks as these protocols assume that nodes follow the prescribed protocol without deviation. Stimulating cooperation among these nodes is an interesting and challenging problem. Providing incentives and pricing the transactions are well known approaches to stimulate cooperation. In this paper, we present a game theoretic framework for truthful broadcast protocol and strategy proof pricing mechanism called immediate predecessor node pricing mechanism (IPNPM). The phrase strategy proof here means that truth revelation of cost is a weakly dominant-strategy (in game theoretic terms) for each node. In order to steer our mechanism-design approach towards practical implementation, we compute the payments to nodes using a distributed algorithm. We also propose a new protocol for broadcast in wireless ad hoc network with selfish nodes based on IPNPM. The features of the proposed broadcast protocol are reliability and a significantly reduced number of packet forwards compared to the number of network nodes, which in turn leads to less system-wide power consumption to broadcast a single packet. Our simulation results show the efficacy of the proposed broadcast protocol

关键词： Pricing Wireless application protocol Broadcasting Mobile ad hoc networks Game theory Power system reliability Intelligent networks Costs Distributed computing Distributed algorithms

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Algorithm partitioning and optimization for network processors

Algorithm partitioning and optimization for network processo...

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Proceedings of the Third IASTED International Conference on Communications, Internet, and Information Technology

作者： Lehmann, Ralf Schill, Alexander Institute for System Architecture Department of Computer Networks Technische Universität Dresden 01062 Dresden Germany

ISBN: (纸本)0889864470

Current high speed networks cannot be fully utilized by today's high end systems. The processing requirements of next generation network protocols require intelligent network cards with network protocol offload engines, for example based on a network processor. To reduce development time, we reuse existing software protocol stack implementations for partitioning and implementing on the network card. Though, manual partitioning is very time-consuming due to the complex protocol stacks. We outline an approach for tool supported software partitioning even for complex C source code.

关键词： computer networks

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IPsec protocol acceleration using network processors

IPsec protocol acceleration using network processors

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Proceedings of the Second IASTED International Conference on Communications, Internet, and Information Technology

作者： Lehmann, Ralf Benz, Mirko Groß, Stephan Hampel, Maik Institute for System Architecture Department of Computer Networks Technische Universität Dresden 01062 Dresden Germany

ISBN: (纸本)0889863989

Gigabit networks can not be fully utilized by today's end systems. The processing requirements of next generation network protocols with enabled encryption features will aggravate this situation. To overcome these shortcomings this paper presents an approach and prototype implementation for hardware support of IP/IPsec protocols. We out-line a hardware/software partitioning, where the data path of the IP/IPsec protocol is accelerated by a network processor. In contrast to other approaches, we reuse existing software protocol stack implementations.

关键词： Telecommunication networks

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Optical burst and packet switching: Node and network design, contention resolution and quality of service - Results from the study in COST 266 7

Optical burst and packet switching: Node and network design,...

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7th International Conference on Telecommunications, ConTEL 2003

作者： Bjørnstad, Steinar Nord, Martin Hjelme, Dag.R. Stol, Norvald Callegati, Franco Cerroni, Walter Raffaelli, Carla Zaffoni, Paolo Gauger, Christoph M. Develder, Chris Cheyns, Jan Van Breusegem, Erik Baert, Elise Colle, Didier Pickavet, Mario Demeester, Piet Lacković, Marko Careglio, Davide Junyent, Gabriel Klinkowski, Miroslaw Marciniak, Marian Kowalewski, Marian Internet Network Architecture Telenor R and D Oslo Norway Department of Physical Electronics NTNU/UNIK Trondheim Norway Department of Telematics NTNU/UNIK Trondheim Norway Research Center COM DTU Lyngby Denmark DEIS University of Bologna Bologna Italy University of Stuttgart Institute of Communication Networks and Computer Engineering Stuttgart Germany Ghent University IMEC Ghent Belgium Department of Telecommunications Faculty of Electrical Engineering and Computing Unska 3 Zagreb Croatia Universitat Politècnica de Catalunya Advanced Broadband Communications Labs. CatalunyaBarcelona Spain National Institute of Telecommunications Department of Transmission and Fiber Technology Warsaw Poland

ISBN: (纸本)9531840520

Future network should be able to efficiently serve packet-based networks, such as the Internet. In this paper, based on results from COST 266, we explore characteristics of Optical Burst switching (OBS) and Optical Packet Switching (OPS). Both node design and Metropolitan Area Network (MAN) are discussed. A unique joint comparative performance evaluation of contention resolution in OBS and OPS are presented, as well as methods of Quality of Service (QoS) differentiation in OBS/OPS networks, and their performance. © 2003, institute of Electrical and Electronics Engineers Inc. All rights reserved.

关键词： Quality of service

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