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检索条件"机构=National Lab. for Parallel and Distributed Processing"

共 87 条记录，以下是11-20 订阅

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Formal Proof for a General Architecture of Hybrid Prefix/Carry-Select Adders

Formal Proof for a General Architecture of Hybrid Prefix/Car...

引用

10th International Conference on Algorithms and Architectures for parallel processing

作者： Liu, Feng Tan, Qingping Song, Xiaoyu Chen, Gang National Lab. of Parallel Distributed Processing Hunan China ECE Department Portland State University Portland OR United States Lingcore Lab. Portland OR United States

ISBN: (纸本)9783642131189

In this paper, we present a general architecture of hybrid prefix/carry-select adder. Based on this architecture, we formalize the hybrid adder's algorithm using the first-order recursive equations and develop a proof framework to prove its correctness. Since several previous adders in the literature are special cases of this general architecture, our methodology can be used to prove the correctness of different hybrid prefix/carry-select adders. The formal proof for a special hybrid prefix/carry-select adder shows the effectiveness of the algebraic structures built in this paper.

关键词： Adders

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Improving cluster computing performance based on job futurity prediction

Improving cluster computing performance based on job futurit...

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2010 3rd International Conference on Advanced Computer Theory and Engineering, ICACTE 2010

作者： Salami, Hossein Saadatfar, Hamid Fard, Farhad Rahmani Shekofteh, S. Kazem Deldari, Hossein Parallel and Distributed Processing Lab. Engineering Department Ferdowsi University of Mashhad Mashhad Iran

ISBN: (纸本)9781424465408

By recognizing the necessity for preventative and proactive management for today's large scale and fault prone distributed systems, a tendency for these mechanisms has been appeared in recent researchers' efforts. From the birth point of this opinion, event prediction has been known as an effective approach to manage errors preventively. In this work, we attempt to make system performance better by using a job futurity predictor as an advisor for system scheduler. We have a clear sighted vision of failure sources and therefore use a comprehensive data set of system, user and job domains. Using predictor results leads to a significant improvement in performance metrics. © 2010 IEEE.

关键词： Forecasting

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Creating virtual networks for distributed virtual computing environment

Creating virtual networks for distributed virtual computing ...

引用

15th International Conference on parallel and distributed Systems, ICPADS '09

作者： Li, Dongsheng Chen, Yixin Huang, Feng National Lab. for Parallel and Distributed Processing College of Computer National University of Defense Technology Changsha City Hunan Province China

ISBN: (纸本)9780769539003

Virtual network is an important approach to support multiple legacy applications running unmodified in distributed virtual computing environments. A virtual networking approach called VirNet is proposed in this paper. VirNet can build multiple customized and isolated virtual networks simultaneously on the same physical hosts in the network, and it enables existing distributed applications written for LANs to run seamlessly on Internet. VirNet is designed completely in user space and requires no change to the kernel of operating systems. Experimental evaluation performed by a reference implementation shows that VirNet is efficient. The latency overhead caused by VirNet is very small and the bandwidth of VirNet is more than 85% of the availab.e physical network bandwidth in both the LAN and emulated WAN environments. © 2009 IEEE.

关键词： Taps

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JSM: Job submission manager for large-scale distributed systems based on game theory

JSM: Job submission manager for large-scale distributed syst...

引用

2010 3rd International Conference on Advanced Computer Theory and Engineering, ICACTE 2010

作者： Saadatfar, Hamid Salami, Hossein Deldari, Hossein Mashhadi, Habib Rajabi Fard, Farhad Rahmani Parallel and Distributed Processing Lab. Engineering Department Ferdowsi University of Mashhad Mashhad Iran

ISBN: (纸本)9781424465408

Nowadays by improving the richness of prediction methods and accessing to the more information about systems behavior, the role of proactive strategies in developing more reliable and efficient systems becomes more crucial. However, the goals of prediction and the way that the results can be employed to upgrade the system are still topics which draw recent researchers' attention. In this work, we attempt to decrease Jobs wait time and failure rate by using the results of a job futurity predictor. For achieving this goal, a system component called JSM is proposed. JSM consults the predictor and employs a game theory based model in order to probably rejecting the jobs which are likely to fail. Furthermore, for avoiding from rejecting safety jobs mistakenly, JSM intelligently adopts its decisions with the systems situations. Experimental results state a significant reduction in jobs wait time and failure rate in comparison with other related work. © 2010 IEEE.

关键词： Forecasting

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Verifying Web services composition

Verifying Web services composition

引用

24th International Conference on Conceptual Modeling

作者： Yang, YP Tan, QP Xiao, Y Computer College National University of Defense Technology China National Lab. of Parallel Distributed Process China

ISBN: (纸本)3540293957

Current Web services composition proposals, such as BPEL, BPSS or WSCI, provide notations for describing the control and message flows in service collab.rations. However, they remain at the descriptive level, without providing any kind of mechanisms or tool support for verifying the composition specified in them. In this paper, we present an approach based on CP-net formalism to analyze and verify Web services composition. We provide translation scheme from composition language into CP-nets and the techniques to analyze and verify effectively the CP-nets to investigate several behavioral properties. Our approach is essentially independent of the language describing composition. As an example, to show the effectiveness of our technique, in this paper, we present the transformation of WSCI to CP-nets, which can be analyzed, verified and simulated as prototypes of WSCI models by the CP-net tools.

关键词： World Wide Web

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A high efficient in-place transposition scheme for multidimensional arrays

A high efficient in-place transposition scheme for multidime...

引用

3rd International Conference on Information and Computing, ICIC 2010

作者： Yuan, Jie Wu, Jian-Ping Wang, Zheng-Hua National Lab. of Parallel and Distributed Processing National University of Defense Technology Changsha China School of Computer Science National University of Defense Changsha China

ISBN: (纸本)9780769540474

This paper presents a in-place cycle-reducing method for multidimensional arrays transposition in local memory to reduce the memory R/W operations. The resulting method can significantly reduce the number of subcycles (also called following-cycles) and that of memory operations for square arrays. Taking square array 256 by 256 for example, the number of subcycles used by current availab.e best algorithm can be reduced from 32894 to only 574, using our new method, and the memory operation number can be reduced by about 32.58%, from 98430 to 66366. Taking advantage of this new method, the elapsed time can be reduced as a result. The number of cycles and operations can also be reduced for 2D rectangle arrays with 2m rows and 2n column stored in column-major, especially n=2m, even though the improvement is not as significant as that for square arrays. The improved 2D in-place algorithm has been extended to 3D arrays, and some theoretic and numerical results are also provided. Furthermore, we develop a new in-place 3D arrays transposition algorithm. This algorithm is very important for a deep research for multidimensional arrays. Experimental results show that our algorithm can improve efficiency significantly, compared to some other 3D array transposition schemes. © 2010 IEEE.

关键词： Multidimensional array Memory operation Cycle-reducing Transposition In-place transposition Transposition arrays three-dimensional array Local Memory MULTIDIMENSIONAL

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Model transformation based verification of Web services composition

引用

4th International Conference on Grid and Cooperative Computing - GCC 2005

作者： Yang, YanPing Tan, QingPing Xiao, Yong School of Computer Science National University of Defense Technology Changsha 410073 China National Lab. of Parallel Distributed Processing Changsha 410073 China

ISBN: (纸本)3540305106

Current Web services composition proposals, such as BPEL, BPSS, BPMN and WSCI, provide notations for describing the control and message flows in Web service collab.rations. However, such proposals remain at the descriptive level, without providing any kind of mechanisms or tool support for verifying the composition specified in the proposed notations. In this paper, we present to analyze and verify Web services composition by using CP-nets. CP-nets combine the strengths of Petri nets with the expressive power of high-level programming and have sound mathematical semantics. These services composition proposals can be transformed by model transformation rules into CP-nets, which can be used to analyze the performance and to investigate behavioral properties by CP-nets specialized tools. © Springer-Verlag Berlin Heidelberg 2005.

关键词： World Wide Web

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parallel transposing and communication strategies for FFT on cluster of SMP architectures with multicore processors

Parallel transposing and communication strategies for FFT on...

引用

Congress on Image and Signal processing, CISP

ISBN: (纸本)9781424465149

This paper presents a high performance parallel formulation for 1-D FFT based on transpose algorithm. The parallel scheme of FFT trades off some efficiency for a more consistent level of parallel performance. It involves matrix transposition, and a new in-place transposing algorithm is introduced into the parallel matrix transposition to improve the efficiency. Depending on the size of the input n, the number of processes p, and the memory or network bandwidth, this method can achieve better parallel performance than the other on cluster of SMP architectures. Test shows us that our scheme can achieve a good speedup. ©2010 IEEE.

关键词： Fast Fourier transforms

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Study of a code comment decision method based on structural features

Study of a code comment decision method based on structural ...

引用

2019 International Conference on Intelligent Computing, Automation and Systems, ICICAS 2019

作者： Wang, Renmin Wang, Tao Wang, Huaimin Key Lab. of Parallel and Distributed Computing National University of Defense Technology Changsha China

ISBN: (纸本)9781728161068

Code comment is one of the most effective ways to help programmers to understand the source code. High-quality comment decisions can not only cover the core code snippets in the software system but also avoid generating redundant code comments. However, in actual development, there is no uniform comment specification, and most of the comment decisions depend on personal experience and domain knowledge. This paper has learned a common comment decision specification from a large number of code comment examples to assist programmers in making appropriate comment decisions during code development. This paper proposes a method to extract the code structure from the context code of the current code line, and use the machine learning algorithm to determine the possibility that the current code needs to add comments. The proposed method was evaluated on 8 well-known open-source Python projects in GitHub and the experimental results show the feasibility and effectiveness of the method in some code types. © 2019 IEEE.

关键词： Machine learning

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A mobile recommendation system based on logistic regression and Gradient Boosting Decision Trees

A mobile recommendation system based on logistic regression ...

引用

2016 International Joint Conference on Neural Networks, IJCNN 2016

作者： Wang, Yaozheng Feng, Dawei Li, Dongsheng Chen, Xinyuan Zhao, Yunxiang Niu, Xin National Lab for Parallel and Distributed Processing School of Computer Science National University of Defense Technology Changsha410003 China

ISBN: (纸本)9781509006199

Real-life behaviors shown by the mobile users typically exhibit plenty noises, making it hard to construct an effective recommendation engine. In this paper, we present a fused model based on the LR algorithm and the GBDT algorithm to recommend vertical industry commodities in a mobile setting. A set of specifically designed methods are proposed to deal with the data preprocessing and feature extraction problem for the mobile recommendation scenario. The proposed method is evaluated on a large scale real-world dataset provided by the Alibaba mobile shopping department. Result on the F1 score has seen an improvement of 2%-36% compared with the baseline. © 2016 IEEE.

关键词： Recommender systems

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