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检索条件"机构=Key Laboratory of Computer System and Architecture"

共 402 条记录，以下是311-320 订阅

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A HyperTransport-based personal parallel computer

A HyperTransport-based personal parallel computer

引用

IEEE International Conference on Cluster Computing

作者： Xiaojun Yang Fei Chen Hailiang Cheng Ninghui Sun Institute of Computing Technology Chinese Academy and Sciences Beijing China Chinese Academy of Sciences Beijing China Key Laboratory of Computer System and Architecture Chinese Academy and Sciences Beijing China

Instead of all using commodity components, an approach building a personal parallel computer on top of a non-coherent HyperTransport (HT) fabric is presented in the paper. The advantage is to provide both lower cost and higher performance compared with the existing method. A HT switch is designed and implemented for the interconnection of a set of AMD Opteron processors for building an in-a-box cluster. On our prototyping system, the result of evaluation experiments shows this approach gives the better performance.

关键词： Switches Program processors computers Bandwidth Fabrics Protocols computer architecture

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Particle Swarm Algorithm for the Quality of Service-Oriented Web Services Selection

Particle Swarm Algorithm for the Quality of Service-Oriented...

引用

International Symposium on Knowledge Acquisition and Modeling, KAM

作者： Hong Xia Zengzhi Li State key Laboratory of Networking and Switch Technology Beijing University of Posts and Telecommunications Beijing China Institute of Computer System Architecture and Network Xi''an Jiaotong University Xi'an Shaanxi China

Existing Web services composition technology, lack of services selecting. A particle swarm optimization algorithm based on the multi-objective optimization strategies was provided to address quality of services to choose the issue of global optimization. It is to transform Web services select the overall optimization problem with QoS into a multi-objective constrained optimization problem based on Qos, using multi-objective PSO intelligent theory, by a number of Qos parameters optimized at the same time, and ultimately produce a set of constraints to meet the Pareto optimal solution. The experimental results show the feasibility and efficiency of the algorithm.

关键词： Particle swarm optimization Web services Quality of service Constraint optimization Pareto optimization Service oriented architecture Switches Constraint theory Logic Optimization methods

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A novel hint-based I/O mechanism for centralized file server of cluster

A novel hint-based I/O mechanism for centralized file server...

引用

IEEE International Conference on Cluster Computing

作者： Huan Chen Jin Xiong Ninghui Sun Chinese Academy of Sciences Beijing China Institute of Computing Technology Chinese Academy and Sciences Beijing China Key Laboratory of Computer Architecture and System Chinese Academy and Sciences Beijing China

In the medium and small cluster systems, the centralized file server such as NFS is the main approach to provide the storage service with low cost and easy management. However, when multiple parallel applications access the shared storage at the same time, the I/O performance decreases much because of the interference of the I/O requests coming from the different clients. In this paper, a hint-based I/O mechanism is proposed and implemented in the United-FS. By analyzing the hint information of the I/O requests, the related requests are grouped, sorted and scheduled by our hint-based I/O scheduler. The experiments show that our hint-based I/O mechanism nearly doubles the read performance compared with NFS, and has better scalability.

关键词： File systems Servers File servers Performance evaluation Bandwidth Scalability Time factors

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A Unified Framework for Wireless Connectivity Study subject to General Interference Attack

A Unified Framework for Wireless Connectivity Study subject ...

引用

IEEE International Conference on Communications

作者： Yang Liu Chengzhi Li Changchuan Yin Huaiyu Dai Beijing Key Laboratory of Network System Architecture Convergence Beijing University of Posts and Telecommunications Beijing China Department of Electrical and Computer Engineering North Carolina State University Raleigh NC

Connectivity is crucial to ensure information availability and survivability for wireless networks. In this paper, we propose a unified framework to study the connectivity of wireless networks under a general type of interference attack, which can address diverse applications including Cognitive Radio, Jamming attack and shadowing effect. By considering the primary users, jammers and deep fading as unified Interferers, we investigate a 3-dimensional connectivity region, defined as the set of key system parameters - the density of users, the density of Interferers and the interference range of Interferers - with which the network is connected. Further we study the impact of the Interferers' settings on node isolation probability, which is a fundamental local connectivity metric. Through percolation theory, the sufficient and necessary conditions for global connectivity are also derived. Our study is supported by simulation results.

关键词： Interference Three-dimensional displays Jamming Wireless networks Security Shadow mapping Information systems

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On reducing both shift and capture power for scan-based testing

On reducing both shift and capture power for scan-based test...

引用

Asia and South Pacific Design Automation Conference

作者： Jia Li Qiang Xu Yu Hu Xiaowei Li Chinese Academy of Sciences Beijing China Department of Computer Science and Engineering Chinese University of Hong Kong Hong Kong China Key Laboratory of Computer System and Architecture ICT Chinese Academy and Sciences Beijing China

ISBN: (纸本)9781424419210

Power consumption in scan-based testing is a major concern nowadays. In this paper, we present a new X-fllling technique to reduce both shift power and capture power during scan tests, namely LSC-filling . The basic idea is to use as few as possible X-bits to keep the capture power under the peak power limit of the circuit under test (CUT), while using the remaining X-bits to reduce the shift power to cut down the CUT's average power consumption during scan tests as much as possible. In addition, by carefully selecting the X-filling order, our X-filling technique is able to achieve lower capture power when compared to existing methods. Experimental results on ISCAS'89 benchmark circuits show the effectiveness of the proposed methodology.

关键词： Circuit testing Energy consumption Power dissipation system testing Electrical fault detection Fault detection Circuit faults Benchmark testing Laboratories Power engineering computing

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QoS-aware transmission management for energy harvesting wireless sensor networks

QoS-aware transmission management for energy harvesting wire...

引用

International Conference on Telecommunications (ICT)

作者： Dan Liu Yan Sun Yuanyuan Yao Changchuan Yin Beijing Key Laboratory of Network System Architecture Convergence Beijing University of Posts and Telecommunications China School of Electronic Engineering and Computer Science Queen Mary University of London London UK

Wireless sensor networks (WSNs) are widely deployed in many fields nowadays. However, the limited energy storage ability of sensor nodes causes great detrimental effect on the performance of the WSNs. Energy harvesting has been proved as one of the promising ways to replenish the energy constrained sensors for prolonging WSNs lifetime. Another exacerbated problem introduced by non-uniform energy distribution and nonoptimal energy management in WSNs also causes great challenge to WSNs. For realizing the efficient energy utilization and improving the performance of energy harvesting enabled WSNs, two transmission management schemes, Markov decision based packets aggregation allocation (MDPA) and partial Kalman filter with best-match aggregation (PKBPA), are proposed respectively in this paper. MDPA focuses on the node's own energy capabilities to decide the packets number for aggregation, while PKBPA decides the number of packets to be aggregated and transmitted based on the estimated energy state information of the node and its next hop. Simulation results show that the PKBPA scheme outperforms other schemes, especially when the energy is insufficient for the packets transmission.

关键词： Wireless sensor networks Buffer storage Energy harvesting Quality of service Resource management Markov processes Energy states

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Verification Web Services Composition Based on OWL-S

Verification Web Services Composition Based on OWL-S

引用

International Symposium on Knowledge Acquisition and Modeling, KAM

In order to ensure the correctness and reliability of Web services composition based on OWL-S, verify the interaction protocol of Web services. It is provided that three lay architecture. Composition service based on OWL-S, GA model is the middle model and the Promela model is the verification model, SPIN as a model validator. The OWL-S composition Web services transform a top-down conversation protocol process into a GA model, use WAST tool into Promela model, the SPIN tool analysis and verification structure and performance of composition services. This method is flexibility and scalability which provide a solution for Web services composition model verification.

关键词： Web services XML Protocols State-space methods Scalability Service oriented architecture computer architecture Switches Automata Asynchronous communication

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A profile-based protein sequence alignment algorithm for a domain clustering database

A profile-based protein sequence alignment algorithm for a d...

引用

IEEE Symposium on Computational Intelligence and Bioinformatics and Computational Biology (CIBCB)

作者： Lin Xu Fa Zhang Zhiyong Liu Graduate School of Chinese Academy of Sciences China Key Laboratory of Computer System and architecture Institute of Computing Technology Chinese Academy and Sciences China National Natural Science Foundation China

Aiming at the two main shortcomings in Homology Modeling, we have designed and established a domain clustering database. Searching the database is a fundamental work for it. However, current alignment algorithms are mainly based on the sequences, ignoring the structure conservation in domain. This paper proposed a profile-based alignment which considers the structure information into the profile, based on the character of our domain database. We designed an experiment within the database. The results show that both the quality and sensitivity of our scheme are better than pure Smith-Waterman and sequence-based profile algorithms. We strongly believe that this work can help to improve the protein structure prediction

关键词： Protein sequence Clustering algorithms Databases Sequences Heuristic algorithms Laboratories computer architecture Algorithm design and analysis Computational efficiency Acceleration

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On capture power-aware test data compression for scan-based testing 08

On capture power-aware test data compression for scan-based ...

引用

IEEE International Conference on computer-Aided Design

作者： Jia Li Xiao Liu Yubin Zhang Yu Hu Xiaowei Li Qiang Xu Chinese Academy and Sciences Beijing China CUhk REliable computing laboratory (CURE) Department of Computer Science & Engineering Chinese University of Hong Kong New Territories Hong Kong China Key Laboratory of Computer System and Architecture ICT CAS Beijing China

ISBN: (纸本)9781424428205

Large test data volume and high test power are two of the major concerns for the industry when testing large integrated circuits. With given test cubes in scan-based testing, the ldquodonpsilat-carerdquo bits can be exploited for test data compression and/or test power reduction. Prior work either targets only one of these two issues or considers to reduce test data volume and scan shift power together. In this paper, we propose a novel capture power-aware test compression scheme that is able to keep scan capture power under a safe limit with little loss in test compression ratio. Experimental results on benchmark circuits demonstrate the efficacy of the proposed approach.

关键词： Test data compression Circuit testing Integrated circuit testing system testing Benchmark testing Automatic testing Laboratories Power engineering computing Power system reliability Integrated circuit technology

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Optimizing Web Browser on Many-Core architectures

Optimizing Web Browser on Many-Core Architectures

引用

IEEE International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT)

作者： Lingjun Fan Weisong Shi Shibin Tang Chenggang Yan Dongrui Fan Graduate University of Chinese Academy of Sciences Beijing China Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China Department of Computer Science Wayne State University Detroit USA

As more and more Web applications emerging on sever end today, the Web browser on client end has become a host of a variety of applications other than just rendering static Web pages. This leads to more and more performance requirements of a Web browser, for which user experience is very important. This situation may become more urgency when on handheld devices. Some efforts like redesign a new Web browser have been made to overcome this problem. In this paper, we address this issue by optimizing the main processes of the Web browser on a state-of-the-art 64-core architecture, Godson-T, which was developed at Chinese Academy of Sciences, as multi-/many-core architecture to be the mainstream processor in the upcoming years. We start a new core to process a new tab when facing up to intensive URL requests, and we use scratch-pad memory (SPM) of each core as a local buffer to store the HTML source data to be processed to reduce off-chip memory access and exploit more data locality, otherwise, we use DTA to transfer HTML data for backup. Experiments conducted on the cycle-accurate simulator show that, starting each tab process by a new core could obtain 5.7% to 50% speedup with different number of cores used to process corresponding URL requests, with on-chip scratchpad memory of each core used to store the HTML data, more speedup could be achieved when number of cores increase. Also, as Data Transfer Agent (DTA) used to transfer the HTML data, the backup of HTML data can get 2X to 5X speedups according to different data amount.

关键词： Browsers HTML Web pages Layout Multicore processing system-on-a-chip

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