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共 337 条记录，以下是181-190 订阅

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A distributed entropy-based QoS multicast routing optimization algorithm for MANET

A distributed entropy-based QoS multicast routing optimizati...

引用

6th International Conference on parallel and distributed computing, applications and technologies (pdcat 2005)

作者： Gui, C Sun, BL Hubei Univ Econ Dept Comp & Elect Sci Wuhan 430205 Peoples R China

ISBN: (纸本)0769524052

A Mobile Ad hoc NETwork (MANET) is an autonomous system of mobile nodes connected by wireless links There is no static infrastructure such as base station as that was in cell mobile communication. Due to the dynamic nature of the network topology and restricted resources, quality of service (QoS) and multicast routing in MANET is a challenging task In this paper, we present an entropy-based model to support QoS multicast routing optimization algorithm in mobile ad hoc networks (EQMOA). The basic motivations or the proposed modeling approach stem from the commonality observed in the location uncertainty in mobile ad hoc wireless networks and the concept of entropy. The simulation results demonstrate that the proposed approach and parameters provide an accurate and efficient method of estimating and evaluating the route stability in dynamic mobile networks.

关键词： Ad Hoc network QoS multicast routing entropy optimization algorithm

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Incentives for participating in a hybrid peer-to-peer system

Incentives for participating in a hybrid peer-to-peer system

引用

6th International Conference on parallel and distributed computing, applications and technologies (pdcat 2005)

作者： Sun, GZ Chen, GL Wu, JM Univ Sci & Technol China Dept Comp Sci & Technol Natl High Performance Comp Ctr Hefei Hefei 230027 Anhui Peoples R China

ISBN: (纸本)0769524052

A hybrid P2P system, such as Napster, has a central directory where the peers publish information about the content they offer for sharing. We study the incentives for self-interested node's participating in such P2P system with centralized directory, by developing the new cost model of P2P network In our model, a node will participate the system if and only if it can get more than it gives. We discover several interesting conclusions on the character of the participating. There is probably a threshold value in such P2P systems, that is, the system is unstable when the number of its nodes is less than the threshold and the system is,table and self-developing when its size exceeding the thresh-old.

关键词： distributed computer systems

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Eliminating inter-thread interference in register file for SMT processors

Eliminating inter-thread interference in register file for S...

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6th International Conference on parallel and distributed computing, applications and technologies (pdcat 2005)

作者： Yang, H Cui, G Yang, XZ Harbin Inst Technol Sch Comp Sci & Technol Harbin 150001 Peoples R China

ISBN: (纸本)0769524052

For simultaneous multithreaded (SMT) processors, a large rename register file (RRF) is indispensable for holding intermediate results of in-flight instructions from multiple threads. Meanwhile, inter-thread interferences lower the efficiency of RRF badly, exacerbating the pressure on RRF design. We propose Thread-Sensitive Register Renaming (TSRR), which tracks the performance variations and dynamically tunes the amount of rename registers available to each thread. In contrast to the traditional fully-shared RRF this partly-shared scheme of TSRR guarantees (1) each thread has opportunities to fully exhibit its performance potential, (2) each thread can occupy just a reasonable number of rename registers, eliminating harmful inter-thread conflicts, and (3) the poorest-performance thread neither hinder other threads nor starve itself.

关键词： distributed computer systems

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parallel downloading algorithm for large-volume file dstribution

Parallel downloading algorithm for large-volume file dstribu...

引用

6th International Conference on parallel and distributed computing, applications and technologies, pdcat 2005

作者： Chen, Haitao Gong, Zhenghu Huang, Zunguo School of Computer Science National University of Defense Technology

ISBN: (纸本)0769524052

BitTorrent is a popular, open-source content distribution system that is conducive for distribution of large-volume files. In this paper, we first model the parallel downloading problem as directed graph and discuss possible improving directions. Then a smart connection management algorithm is proposed, which introduces the notion of content group and sub-tracker, and decentralizes the decision process performed at the tracker for transfer coordination. Simulations show that by increasing content availability to the clients from their immediate neighbors, it can significantly improve the efficiency of distribution. © 2005 IEEE.

关键词： parallel algorithms

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Design and implementation of TIGER grid: An integrated metropolitan-scale grid environment

Design and implementation of TIGER grid: An integrated metro...

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6th International Conference on parallel and distributed computing, applications and technologies, pdcat 2005

作者： Yang, Chao-Tung Li, Kuan-Ching Chiang, Wen-Chung Shih, Po-Chi Department of Computer Science and Information Engineering Tunghai University Taichung Taichung 40704 Taiwan Department of Computer Science and Information Management Providence University Shalu Taichung 43301 Taiwan Department of Information Management Hsiuping Institute of Technology Dali Taichung 41280 Taiwan

ISBN: (纸本)0769524052

Internet computing and Grid technologies promise to change the way we tackle complex problems. Harnessing these new technologies effectively, it will transform scientific disciplines ranging from high-energy physics to life sciences. This paper describes a metropolitan-scale Grid computing platform named TIGER Project (standing for Taichung Integrating Grid Environment and Resource), which basically interconnects universities and high schools' cluster computing resources and sharing available resources among them, for investigations in system technologies and high performance applications. This novel project shows the viability of implementation of such project in a metropolitan city.

关键词： distributed computer systems

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An adaptable software architecture based on mobile components in pervasive computing

An adaptable software architecture based on mobile component...

引用

6th International Conference on parallel and distributed computing, applications and technologies, pdcat 2005

作者： Han, Songqiao Zhang, Shensheng Zhang, Yong Fan, Chang'e CIT Lab. Shanghai Jiaotong University Shanghai 200030 China

ISBN: (纸本)0769524052

distributed applications operating in pervasive computing environment should have abilities to cope with the high heterogeneity and variability of this environment. In a high abstract level, the dynamic software architecture can be used to provide the flexibility and adaptation for the applications by modifying the structure of software, such as adding, removing, replacing components, in the execution time. Besides, mobile codes technologies have provided ability to move around for components. However, software architecture supporting component migration has not been deeply studied. In this paper, an adaptable software architecture for pervasive computing is introduced. We revisit software architecture, and describe its elements related to mobility, especially components and connectors, in formal forms. Due to the components' correlation, the migration relationships between two components are proposed and discussed in detail. As an example, multiple notable design paradigms are expressed in a unified way by using our mobile component approach, which shows the effectiveness and generality of our model. © 2005 IEEE.

关键词： distributed computer systems

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Scalable parallel quadrilateral mesh generation coupled with mesh partitioning

Scalable parallel quadrilateral mesh generation coupled with...

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6th International Conference on parallel and distributed computing, applications and technologies (pdcat 2005)

作者： Chen, JJ Zheng, Y Ning, X Zhejiang Univ Ctr Engn & Sci Computat Hangzhou 310027 Zhejiang Peoples R China Zhejiang Univ Coll Comp Sci Hangzhou 310027 Zhejiang Peoples R China

ISBN: (纸本)0769524052

In this paper, we present our efforts to parallelize an unstructured quadrilateral mesh generator. Its serial version is based on the divider-and-conquer idea, and mainly includes two stages, i.e. geometry decomposition and mesh generation. Both stages are parallelized separately. A highly efficient fine-grain level parallel scheme is presented to parallelize the stage of geometry decomposition. A SubDomain Graph (SDG), which represents the connections of subdomains, is constructed The task of parallel mesh generation is then reduced to that of the SDG partitioning. Since the number of elements in subdomains could be pre-computed before meshing, a static load balancing scheme to partition the SDG performs well with the aid of Metis tools. Numerical results show that scalable timing performance could be achieved by using the parallel mesh generator with resulting meshes nicely partitioned among processors, which enables a fast parallel simulation environment by eliminating the traditional 110-busy process of mesh repartitioning.

关键词： parallel processing systems

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Some new parallel fast Fourier transform algorithms

Some new parallel fast Fourier transform algorithms

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6th International Conference on parallel and distributed computing, applications and technologies, pdcat 2005

作者： Zhong, Cui-Xiang Han, Guo-Qiang Huang, Ming-He School of Computer Science and Engineering South China University of Technology Guangzhou 510640 Guangdong China Software College Jiangxi Normal University Nanchang 330027Jiangxi China

ISBN: (纸本)0769524052

Discrete Fourier transform (DFT) has many applications in digital signal and image processing and other scientific and technological domains, but its time complexity of direct computation is O(n2), limiting greatly its application range. Thus many people have developed fast Fourier transform (FFT) algorithms, reducing the complexity from O(n2) to O(nlogn)(In this paper logn denotes log2n).But for large n, O(nlogn) is still very high. So multiprocessor systems have been used to speed up the computation of DFT. This paper first introduces a new general method to deduce FFT algorithms, then transforms the deduced second radix-2 decimation-in-time FFT algorithm into another parallelizable sequential form, and finally transforms the latter algorithm into a new parallel FFT algorithm, reducing the time complexity of DFT to O(nlogn/p) (where p is the number of processors). Using similar methods, the authors can also design other new parallel 1-D and 2-D FFT algorithms. © 2005 IEEE.

关键词： Discrete Fourier transforms

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Two-path limited speculation method for static/dynamic optimization in multithreaded systems

Two-path limited speculation method for static/dynamic optim...

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6th International Conference on parallel and distributed computing, applications and technologies (pdcat 2005)

作者： Yokota, T Saito, M Furukawa, F Ootsu, K Baba, T Utsunomiya Univ Dept Comp Sci Utsunomiya Tochigi 3218585 Japan

ISBN: (纸本)0769524052

Extracting thread-level parallelism, as well as instruction-level one, is greatly expected for modern microprocessors. Speculative multithreading is one of the most hopeful candidates, although, its performance improvement depends on prediction accuracy. On the other hand, profiling techniques can accelerate programs since it can reflect the programs' actual behavior This paper focuses our discussion on utilizing path-based profiling results in improving speculative multithreaded codes. Programs have many conditional branches thus many possible paths arise, however actually executed paths are very limited. Thus we show that most frequent two paths are sufficient candidates for prediction and speculation, and we present a novel speculation method, two-path limited speculation. Furthermore, we present a simple path predictor based on two level branch predictor Analytical and trace-driven evaluation results show the effectiveness of the proposed method.

关键词： distributed computer systems

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Ontology-based clustering and routing in peer-to-peer networks

Ontology-based clustering and routing in peer-to-peer networ...

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6th International Conference on parallel and distributed computing, applications and technologies (pdcat 2005)

作者： Li, J Vuong, S Univ British Columbia Dept Comp Sci Vancouver BC V5Z 1M9 Canada

ISBN: (纸本)0769524052

How to improve the performance of content searching in peer-to-peer (P2P) systems is a challenging issue. In this paper we attack this problem by proposing a new decentralized P2P architecture ontoloy-based community overlays. The system exploits the semantic property of the content in the network to cluster nodes sharing similar interest together to improve the query and searching performance. Specifically, a distributed hash table (DHT) based overlay is constructed to assist peers organizing into communities. Those peers in the same community form a Gnutella-like unstructured overlay. This architecture helps reduce the search time and decrease the network traffic by minimizing the number of messages propagated in the system. Moreover, it retains the desirable properties of existing unstructured architectures, including being fully decentralized with loose structure, and supporting complex queries. We demonstrate by simulation, that with this architecture, peers can get more relevant resources faster and with less traffic generated.

关键词： distributed computer systems

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