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检索条件"主题词=Parallel algorithms"

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Low Cost parallel Adaptive Filter Structures

Low Cost Parallel Adaptive Filter Structures

引用

Asilomar Conference on Signals, Systems & Computers

作者： Chao Cheng K.K. Parhi Department of Electrical & Computer Engineering University of Minnesota Minneapolis MN USA

In this paper, we present two parallel LMS adaptive filtering algorithms with low hardware. The proposed parallel algorithm 1 doesn't alter the input-output behavior and saves large amount of hardware cost of previous designs, especially when the parallelism level is high. For example, it saves 68.4% of the multiplications and 4.7% of the additions, of those of prior fast parallel adaptive filtering algorithms when parallelism level is 72 and the filter length N is large. The proposed parallel algorithm 2, while maintaining the same performance, can further save 5.56% to 12.5% of the multipliers and 8.54% to 24.9% of the additions when the level of parallelism varies from 3 to 72

关键词： Costs Adaptive filters Hardware Finite impulse response filter parallel processing Least squares approximation Filtering algorithms parallel algorithms Pipeline processing Convolution

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A new parallel algorithm for security constrained optimal power flow with a nonlinear interior point method

A new parallel algorithm for security constrained optimal po...

引用

IEEE General Meeting Power& Energy Society

作者： Wei Qiu A.J. Flueck Feng Tu Department of Electrical and Computer Engineering Illinois Institute of Technology Chicago IL USA AREVA T&D Automation슠and Information Systems Bellevue WA USA

This paper presents a new algorithm for parallel solution of security constrained optimal power flow (SCOPF) with a nonlinear interior point method (IPM). In the parallel algorithm proposed in this paper, the SCOPF problem is easily decomposed and distributed to a set of processors where the computations are done independently on a subset of the contingency states. Moreover, a full AC model is used in this parallel algorithm. The new parallel algorithm has been tested for accuracy and speedup with two systems: one with 57 buses, 80 branches and 9 contingencies, another with 3493 buses, 6689 branches and 79 contingencies. With less than 1% relative error and more than a factor of 10 speedup, the test results demonstrate that this new parallel algorithm with IPM is accurate and efficient for large-scale SCOPF problems.

关键词： parallel algorithms Load flow DC generators Power generation Linear programming Power system security Bismuth Nonlinear control systems Control systems Character generation

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Performance evaluation of view-oriented parallel programming

Performance evaluation of view-oriented parallel programming

引用

International Conference on parallel Processing (ICPP)

作者： Z. Huang M. Purvis P. Werstein Department of Computer Science University of Otago Dunedin New Zealand Department of Information Science University of Otago Dunedin New Zealand

This paper evaluates the performance of a novel view-oriented parallel programming style for parallel programming on cluster computers. View-oriented parallel programming is based on distributed shared memory which is friendly and easy for programmers to use. It requires the programmer to divide shared data into views according to the memory access pattern of the parallel algorithm. One of the advantages of this programming style is that it offers the performance potential for the underlying distributed shared memory system to optimize consistency maintenance. Also it allows the programmer to participate in performance optimization of a program through wise partitioning of the shared data into views. Experimental results demonstrate a significant performance gain of the programs based on the view-oriented parallel programming style.

关键词： parallel programming Programming profession Message passing Concurrent computing parallel algorithms Computer science Information science Optimization Performance gain Distributed computing

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A niche for parallel island models: outliers and local search

A niche for parallel island models: outliers and local searc...

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International Conference on parallel Processing Workshops (ICPPW)

作者： S. Gustafson E.K. Burke School of Computer Science & IT University of Nottingham UK

This paper reports on the development of a novel island model for evolutionary algorithms, which is intrinsically parallel and intended to better utilise resources and outlier solutions encountered during search. Outliers serve as seeds for new islands using a similar evolutionary algorithm or a local search procedure. In this initial study, we examine a definition of outliers and demonstrate the ability to obtain improvements using outliers and a simple local search method.

关键词： Genetic programming Evolutionary computation Biological system modeling Search methods Distributed computing Computer science parallel algorithms Topology Genetic algorithms parallel processing

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parallel algorithm for computation of deadlocks and traps in Petri nets

Parallel algorithm for computation of deadlocks and traps in...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： A. Wegrzyn University of Zielona Gora Zielona Gora Poland

In the paper the method of computation all deadlocks and traps in the Petri net is presented. This method is based on Thelen method. Methods of calculation of all deadlocks and traps in Petri nets are very time consuming. Therefore it is very important to optimize a computation. The parallel computation method for the time reduction is proposed. Experimental results of presented method are discussed, as well

关键词： parallel algorithms Concurrent computing System recovery Petri nets Digital circuits parallel processing Equations Testing Boolean functions Bipartite graph

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Road situation modeling and parallel algorithm implementation with FCD based on principle curves

Road situation modeling and parallel algorithm implementatio...

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International Conference on High Performance Computing in the Asia-Pacific Region

作者： Zhaohui Zhang Changjun Jiang Yu Fang Department of Computer Science Tongji University Shanghai China Department of Computer Science Technology of Anhui Normal University Wuhu China

This paper is to model the road situation with Floating Car Data (FCD) based on principle curves. The relationship of the time and the passing velocity through a road segment is presented by the Principle Curves (PCs) which can reflect urban traffic situation. And the rules of road situation are built by PCs. Moreover, a parallel algorithm is proposed to build the models because of massive GPS data and the large road net. The task scheduling policy of the algorithm can assign tasks of different size to processors with different speed such that all subtasks complete at the same time in theory. The experimental results indicate that the increasing multiple of the speedup is about equal to the increasing multiple of the processors, and that the efficiency of each processor is about 93% in the heterogeneous computing platform with the algorithm

关键词： parallel algorithms Roads Traffic control Global Positioning System Telecommunication traffic High performance computing Computer science Vehicles Concurrent computing Educational technology

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An improved parallel algorithm for sequence mining

An improved parallel algorithm for sequence mining

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IEEE International Conference on Mechatronics and Automation

作者： Chundong She Jian Tang Lei Li Hongbing Wang Zhihua Fan Institute of Software Chinese Academy and Sciences Beijing China

It is more and more important in data mining field to finding the frequent sequences in a large database. The paper briefly introduces the basic concept of frequent sequence mining and presents the data parallel formulation and task parallel formulation of tree-projection based algorithm. Moreover, the on-line LPT algorithm is used to successfully solve the problem of imbalance for the task parallel formulation. Our experiment shows that these algorithms are capable of achieving good speedups. However, the task parallel formulation is more scalable than the data parallel one.

关键词： parallel algorithms Sequences Databases Frequency Concurrent computing parallel processing Web pages Partitioning algorithms Distributed computing Data mining

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A partial parallel algorithm and architecture for arithmetic encoder in JPEG2000

A partial parallel algorithm and architecture for arithmetic...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Yijun Li M. Elgamel M. Bayoumi The Center for Advanced Computer Studies University of Louisiana Lafayette LA USA

For JPEG2000 real-time applications, embedded block coding with optimized truncation (EBCOT) is a time-consuming part and becoming a bottleneck for the entire system throughput. Since the arithmetic encoder (AE) is one part of EBCOT, low performance of AE can significantly degrade the performance. AE is inherently a serial process with high dependency and parallelization of AE is difficult. In this paper, a partial parallel algorithm for AE is proposed. One distinct characteristic of the proposed algorithm is that two contexts can be processed in one clock cycle. Based on the proposed algorithm, a pipelined architecture is implemented. Experimental results, with standard test image benchmarks, show that the proposed algorithm and architecture achieves about 24% improvement in the system throughput in comparison with the architecture based on the original AE algorithm.

关键词： parallel algorithms Arithmetic Image coding Discrete wavelet transforms Throughput Transform coding Tiles Clocks Digital cameras Computer architecture

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parallel polynomial root extraction on a ring of processors

Parallel polynomial root extraction on a ring of processors

引用

International Symposium on parallel and Distributed Processing (IPDPS)

作者： H. Sarbazi-Azad IPM School of Computer Science Sharif University of Technology Tehran Iran

In this paper, a parallel algorithm for computing the roots of a given polynomial of degree n on a ring of processors is proposed. The algorithm implements Durand-Kerner's method and consists of two phases: initialization, and iteration. In the initialization phase all the necessary preparation steps are realized to start the parallel computation. It includes register initialization and initial approximation of roots requiring 3n-2 communications, 2 exponentiation, one multiplications, 6 divisions, and 4n-3 additions. In the iteration phase, these initial approximated roots are corrected repeatedly and converge to their accurate values. The iteration phase is composed of some iteration steps, each consisting of 3n communications, 4n+3 additions, 3n+1 multiplications, and one division.

关键词： Polynomials Iterative methods Iterative algorithms Clustering algorithms parallel algorithms Multicast algorithms Algorithm design and analysis Concurrent computing Convergence Telecommunication traffic

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On construction of a visualization toolkit for MPI parallel programs in cluster environments

On construction of a visualization toolkit for MPI parallel ...

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International Conference on Advanced Information Networking and Applications (AINA)

作者： Kuan-Ching Li Hsun-Chang Chang Chao-Tung Yang Liria Matsumoto Sato Chung-Yuan Yang Yin-Yi Wu Mao-Yueh Pel Hsiang-Kai Liao Min-Chieh Hsieh Chia-Wen Tsai Parrallel and Distributed Processing Center CSIM Department Providence University Taichung Taiwan HPC Laboratory CSIE Department Tunghai University Taichung Taiwan LASB Laboratory PCS Department University of Sao Paulo Brazil

ISBN: (纸本)0769522491

The low cost and wide availability of PC-based clusters have made them an excellent alternative to access supercomputing. However, while network of workstations may be readily available, there is an increasing need for performance tools that support these platforms, in order to achieve even higher performance. One of possible ways to increase performance is parallel program restructuring. It is introduced in this paper a toolkit to generate graphical charts for visualization of MPI parallel programs, reflecting to its execution over time, with the use of DP*Graph representation, parallel version of timing graph. In other words, parallel programs are shown through charts its sequential codes, dependencies and communication structures in a particular cluster system platform. Still in this paper, it is discussed the implementation of this toolkit and present some experimental results obtained.

关键词： Visualization Timing Computer networks Concurrent computing Workstations Power engineering computing Laboratories Costs Distributed processing parallel algorithms

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