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检索条件"任意字段=10th International Conference on Algorithms and Architectures for Parallel Processing"

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FUNCTION-ORIENTED PROCESSORS WIth HOMOGENOUS ARCHITECTURE FOR DATA FLOW SIGNAL processing IN thE SPACE-BORN CONTROL SYSTEMS 24

FUNCTION-ORIENTED PROCESSORS WITH HOMOGENOUS ARCHITECTURE FO...

引用

24th international Crimean conference Microwave & Telecommunication Technology (CriMiCo)

作者： Lookin, N. A. Urals Fed Univ Inst Radioelect & Informat Technol 32 Mira Str Ekaterinburg 620002 Russia RAS Inst Engn Sci Ural Branch Ekaterinburg 620049 Russia

ISBN: (纸本)9789663354125

Continuous complication of data processing algorithms for space and air vehicles results to special-purpose processor embedded on the different levels of board hardware. their architectures and instructions sets are adopted for effective implementation of the most complicated computational algorithms. It is important for real-time digital signal and image processing when computer performance must perform about 10(12) op/sec. these processors are intended for real-time data flow computation with large massive of signals or pixels and considered as a VLSI. Some problems of development of the functional-oriented processors with homogeneous architecture are discussed in the paper.

关键词： VLSI aerospace computing aerospace control control engineering computing data flow computing data handling image processing instruction sets multiprocessing systems air vehicles complicated computational algorithms computer performance data flow signal processing data processing algorithms function-oriented processors homogeneous architecture homogenous architecture instructions sets real-time data flow computation real-time digital image processing real-time digital signal processing space vehicles space-born control systems special-purpose processor

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Efficient concurrent processing of separable 2-D transforms in C++11 27

Efficient concurrent processing of separable 2-D transforms ...

引用

27th international conference on Computer Applications in Industry and Engineering, CAINE 2014

作者： Weiss, John M. Department of Mathematics and Computer Science South Dakota School of Mines and Technology Rapid CitySD57701-3995 United States

ISBN: (纸本)9781880843970

Separable 2-D transforms (such as the 2-D Fourier transform) are widely used in fields such as data analysis and image processing. Fast processors and divide-and-conquer algorithms have made these 2-D transforms accessible on desktop computers. Nonetheless, the widespread use of multi-core architectures makes significant efficiency improvements possible. In the past, parallel processing in C++ has been restricted to external libraries. But the recent release of C++11 introduces concurrency constructs into the language itself, providing obvious benefits to software development, optimization, and portability. this paper examines the high level concurrency interface in C++11, and demonstrates that significant efficiency gains are achievable for the 2-D Fourier transform on standard multi-core processors. this approach is readily extensible to other separable 2-D transforms such as wavelet transforms and the discrete cosine transform, and is equally applicable to other separable 2-D operations such as convolution and correlation. It promises to scale well to future multi-core processors, as additional CPUs become available. Copyright ISCA, CAINE 2014.

关键词： Efficiency

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Analysis of Partitioning Models and Metrics in parallel Sparse Matrix-Vector Multiplication 1

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10th international conference on parallel processing and Applied Mathematics (PPAM)

作者： Kaya, Kamer Ucar, Bora Catalyuerek, Uemit V. CNRS Lyon France

ISBN: (数字)9783642551956

ISBN: (纸本)9783642551956

Graph/hypergraph partitioning models and methods have been successfully used to minimize the communication among processors in several parallel computing applications. parallel sparse matrix-vector multiplication (SpMxV) is one of the representative applications that renders these models and methods indispensable in many scientific computing contexts. We investigate the interplay of the partitioning metrics and execution times of SpMxV implementations in three libraries: Trilinos, PETSc, and an in-house one. We carry out experiments with up to 512 processors and investigate the results with regression analysis. Our experiments show that the partitioning metrics influence the performance greatly in a distributed memory setting. the regression analyses demonstrate which metric is the most influential for the execution time of the libraries.

关键词： parallel sparse-matrix vector multiplication Hypergraph partitioning

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A Preliminary Investigation of Multi-User Interference Cancellation Techniques at Roadside Unit in Vehicular Networks 10

A Preliminary Investigation of Multi-User Interference Cance...

引用

10th international conference on Mobile Ad-hoc and Sensor Networks MSN

作者： Jiang, Fan Moloney, Cecilia Li, Cheng Mem Univ Newfoundland Fac Engn & Appl Sci St John NF A1B 3X5 Canada

ISBN: (纸本)9781479973941

In this paper, we investigate multi-user interference cancellation (MU) schemes for deployment at roadside unit in vehicular ad hoc networks. Generally, MITI schemes can be divided into linear and nonlinear groups. In linear MUI schemes, successive and parallel interference cancellation schemes are widely used. In successive interference cancellation (SIC) schemes, the receiver will detect the user's data on a per user base, and immediately cancel the interference of the detected user for the next detection. On the contrary, parallel interference cancellation (PIC) schemes detect a group of users' data simultaneously, then cancel the interference of all users in the next round of operation. there exists error propagation problem in both successive and parallel interference cancellation schemes. To address the problem, ordered successive interference cancellation scheme has been proposed to improve the bit error rate (HER) performance by the receiver detecting the user with the highest instantaneous signal-to-interference-plus-noise ratio (SINR) and canceling the interference of that user for another continuously. the process repeats until all users' data are detected. Besides, iterative processing techniques are also introduced to further improve the system BER performance. In this paper, we study and compare the interference cancellation schemes for uplink transmission in vehicular ad hoc networks. Simulation results show that the BER performance is much better in ordered successive interference cancellation schemes than both the SIC and PIC schemes, especially in high signal-to-noise ratio regions where the multi-user interference becomes dominant. It is also shown through the study that the ordering procedure can efficiently avoid the error propagation problem in vehicular net works.

关键词： multi-user interference cancellation iterative processing ordering procedure vehicular ad hoc networks

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PA*SE: parallel A* for Slow Expansions 24

PA*SE: Parallel A* for Slow Expansions

引用

24th international conference on Automated Planning and Scheduling (ICAPS)

作者： Phillips, Mike Likhachev, Maxim Koenig, Sven Carnegie Mellon Univ Pittsburgh PA 15213 USA Univ Southern Calif Los Angeles CA USA

ISBN: (纸本)9781577356608

Planners need to become faster as we seek to tackle increasingly complicated problems. Much of the recent improvements in computer speed is due to multi-core processors. For planners to take advantage of these types of architectures, we must adapt algorithms for parallel processing. there are a number of planning domains where state expansions are slow. One example is robot motion planning, where most of the time is devoted to collision checking. In this work, we present PA*SE, a novel, parallel version of A* (and weighted A*) which parallelizes state expansions by taking advantage of this property. While getting close to a linear speedup in the number of cores, we still preserve completeness and optimality of A* (bounded sub-optimality of weighted A*). PA*SE applies to any planning problem in which significant time is spent on generating successor states and computing transition costs. We present experimental results on a robot navigation domain (x,y,heading) which requires expensive 3D collision checking for the PR2 robot. We also provide an in-depth analysis of the algorithm's performance on a 2D navigation problem as we vary the number of cores (up to 32) as well as the time it takes to collision check successors during state expansions.

关键词： Planning

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Additive Schwarz Method for Nonsymmetric Local Discontinuous Galerkin Discretization of Elliptic Problem 1

引用

10th international conference on parallel processing and Applied Mathematics (PPAM)

作者： Klawe, Filip Z. Univ Warsaw Inst Appl Math & Mech PL-02097 Warsaw Poland

ISBN: (数字)9783642551956

ISBN: (纸本)9783642551956

In this paper we design two-level additive Schwarz method method for non-symmetric, elliptic problem in two dimensions with the use of discerization by local discontinuous Galerkin method (LDG). To construct the preconditioner, we use the domain decomposition method. We also want to show the result of numerical tests regarding to this preconditioner. Condition of the preconditioned system does not depend on the size of fine mesh h, but only on the ratio of the coarse mesh size H and the overlap measure delta.

关键词： parallel preconditioner Local discontinuous Galerkin Convection-diffusion

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An Efficient Memory Model for Implementing Image Resizing algorithms in a Distributed Environment 16

An Efficient Memory Model for Implementing Image Resizing Al...

引用

16th UKSim-AMSS international conference on Computer Modelling and Simulation (UKSim)

作者： Ali, Syed Hayat, Liaqat Ajman Univ Sci & Technol Coll Informat Technol Ajman U Arab Emirates Yanbu Ind Coll Elect & Instrumentat Engn Technol Yanbu Saudi Arabia

ISBN: (纸本)9781479949236

Image resizing algorithms are a classic case of algorithms involving local operations over a region of pixels in an image. the objective is to produce a reduced or enlarged image while maintaining original information content or minimizing the mean square error between corresponding pixels of original and resized images. Most resizing algorithms rely on pixel values within a pre-defined neighborhood of a pixel in the original image to compute pixel values in target images. High frequency or high energy pixel regions in an image are more prone to distortions/errors in the resized image. Content-aware algorithms minimize this impact at the cost of more computational complexity and cost. parallel/distributed implementations of such algorithms require an efficient methodology of image data partitioning to minimize interdependency of the processing units and/or memory storage to avoid shared memory access bottleneck. A restricted shared memory model is described herein that is well-tailored for most of the computational techniques used in image resizing algorithms. Implementation results are described for some well-known algorithms that demonstrate the suitability of the model and its scalability to cater for large image sizes.

关键词： Image resizing distributed processing restricted shared memory model

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parallel Seed-Based Approach to Protein Structure Similarity Detection 1

引用

10th international conference on parallel processing and Applied Mathematics (PPAM)

作者： Chapuis, Guillaume Le Boudic-Jamin, Mathilde Andonov, Rumen Djidjev, Hristo Lavenier, Dominique IRISA Rennes INRIA GenScale Rennes France

ISBN: (数字)9783642551956

ISBN: (纸本)9783642551956

Finding similarities between protein structures is a crucial task in molecular biology. Many tools exist for finding an optimal alignment between two proteins. these tools, however, only find one alignment even when multiple similar regions exist. We propose a new parallel heuristic-based approach to structural similarity detection between proteins that discovers multiple pairs of similar regions. We prove that returned alignments have RMSDc and RMSDd lower than a given threshold. Computational complexity is addressed by taking advantage of both fine-and coarse-grain parallelism.

关键词： Protein structure comparison parallel computing Seed-based heuristic Alignment graph

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Non-uniform Quantum Spin Chains: Simulations of Static and Dynamic Properties 1

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10th international conference on parallel processing and Applied Mathematics (PPAM)

作者： Barasinski, Artur Brzostowski, Bartosz Matysiak, Ryszard Sobczak, Pawel Wozniak, Dariusz Univ Zielona Gora Inst Phys PL-65516 Zielona Gora Poland

ISBN: (数字)9783642551956

ISBN: (纸本)9783642551956

Since magnetic materials are often composed of magnetically isolated chains, their magnetic properties can be described by the one-dimensional quantum Heisenberg model. the quantum transfer matrix (QTM) method based on a checkerboard structure has been applied for quantum alternating spin chains. To increase the length of the transfer matrix in the Trotter direction we apply the density-matrix renormalization technique and check the efficiency of parallelization for a part of the code: the construction of the transfer matrix. Next, using the Matrix Product State representation, the time evolution of the ground-state magnetization has been performed after the sudden change in applied field.

关键词： Static and dynamic magnetic properties Heisenberg model Numerical simulations parallel processing

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Comparing Images Based on Histograms of Local Interest Points

Comparing Images Based on Histograms of Local Interest Point...

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10th international conference on parallel processing and Applied Mathematics (PPAM)

作者： Nowak, Tomasz Gabryel, Marcin Korytkowski, Marcin Scherer, Rafal Czestochowa Tech Univ Inst Computat Intelligence PL-42200 Czestochowa Poland

ISBN: (纸本)9783642552243

One of the key unresolved issues of image processing is the lack of methods for searching images similar to the reference image. this paper focuses on objects that there are in images and presents a method to compare the objects and search for images that contain objects belonging to the same classes. Taking advantage of the fact that local keypoints of images constitute a very good basis for further processing images, we use them for objects comparison. More precisely, the comparison of images is based on histograms, that are generated on the basis of the keypoints of objects contained in images. We present results of experiments which have been conducted for various classes of objects and histograms generated using the proposed method.

关键词： Content-based image processing Histogram comparison

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