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检索条件"任意字段=8th International Conference on Algorithms and Architectures for Parallel Processing"

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parallel Implementation of Particle Tracking and Collision in a Turbulent Flow

Parallel Implementation of Particle Tracking and Collision i...

引用

8th international conference, PPAM 2009

作者： Rosa, Bogdan Wang, Lian-Ping Inst Meteorol & Water Management Ul Podlesna 61 PL-01673 Warsaw Poland Univ Delaware Dept Mech Engn 126 Spencer Lab Newark DE 19716 USA

ISBN: (纸本)9783642144028

parallel algorithms for particle tracking are central to the modeling of a wide range of physical processes including cloud formation, spray combustion, flows of ash from wildfires and reactions in nuclear systems Here we focus on tracking the motion of cloud droplets with radii in the range from 10 to 60 mu m that are suspended in a turbulent flow field the gravity and droplet inertia are simultaneously considered Our codes for turbulent flow and droplet motion are fully parallelized in MPI (message passing interface), allowing efficient computation of dynamic and kinematic properties of a polydisperse suspension with more than 10(7) droplets Previous direct numerical simulations (DNS) of turbulent collision, due to their numerical complexity, are typically limited to small Taylor microscale flow Reynolds numbers (similar to 100), or equivalently to a small physical domain size at a given flow dissipation rate in a turbulent cloud the difficulty lies in the necessity to treat simultaneously a field representation of the turbulent flow and free movement of particles We demonstrate here how the particle tracking and collision can be handled within the framework of a specific domain decomposition Our newly developed MPI code can be run on computers with distributed memory and as such can take full advantage of available computational resources We discuss scalability of five major computational tasks in our code collision detection, advancing particle position, fluid velocity interpolation at particle location, implementation of the periodic boundary condition, using up to 128 CPUs In most tested cases we achieved parallel efficiency above 100 % due to a reduction in effective memory usage Finally, our MPI results of pair statistics are validated against a previous OpenMP implementation

关键词： Message passing

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A filter-and-fan based heuristic for the scheduling problem of parallel batch-processing machines with deterioration consideration and nonidentical job release times

A filter-and-fan based heuristic for the scheduling problem ...

引用

作者： Meng, Ying Tang, Linxin Liaoning Key Laboratory of Manufacturing System and Logistics Logistics Institute Northeastern University Shenyang China

ISBN: (纸本)9789623676960

We investigate a scheduling problem for the parallel batch-processing machines with deterioration consideration and non-identical job release times. the objective is to minimize the makespan. A linear programming model is formulated. Considering the complexity of the problem, a filter-and-fan based heuristic is proposed. three neighborhoods based on the characteristics of the problem are designed and used in the filterand-fan method. To probably avoid the search being trapped in a local optimum, a reconstructive strategy is proposed to strengthen the dispersity of solutions in the search process. A speedup strategy is also proposed to shorten the run time of the proposed method. the computational results show that for most of instances with small scale the heuristic can obtain optimal solutions. For all instances with large scale, the heuristic significantly outperform the standard commercial solver both on run time and quality of solution.

关键词： Deterioration

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parallelization of Face Detection Engine

Parallelization of Face Detection Engine

引用

international conference on parallel processing Workshops (ICPPW)

作者： Deepak Shekhar T. C. Kiran Varaganti Samsung Advanced Institute of Technology India Lab Samsung India Software Operations Pvt Ltd Bengaluru India

Video processing is computationally intensive and often has accompanying real-time or super-real-time requirements. For example, video tagging and surveillance systems need to robustly analyze video and automatically recognize the faces in real time. the semiconductor industry has shifted from increasing clock speeds to a strategy of growth through increasing core counts. this shift from single core to multi-core presents a major challenge to application developers to exploit sufficient parallelism in performance-sensitive applications. this give rise to a new computation paradigm for developing more advance algorithms. In this paper, we present a method to efficiently parallelize face detection which can be extended to any object detection algorithms for SMP architectures. We also show that a well-designed parallel code of face detection algorithm will result in a performance gain in excess of 2X on dual core systems.

关键词： Face Face detection Multicore processing Synchronization Object detection Instruction sets Face recognition

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A comparison of pipelined parallel and iterative CORDIC design on FPGA

A comparison of pipelined parallel and iterative CORDIC desi...

引用

international conference on Industrial and Information Systems, ICIIS

作者： Ramesh Bhakthavatchalu M.S. Sinith Parvathi Nair K. Jismi Department of ECE Amrita Viswavidyapeetham University Kollam Kerala India Amrita Vishwa Vidyapeetham Coimbatore Tamil Nadu IN

Many hardware efficient algorithms exists for hardware signal processing architecture. Among these algorithm is a set of shift-add algorithms collectively known as CORDIC (Coordinate Rotation for Digital Computers) for computing a wide range of functions including certain trigonometric, hyperbolic, linear and logarithmic functions. the paper compares the different CORDIC architectures with respect to their area, speed, and data throughput performance especially in three different major styles iterative, parallel and pipelined structures. All three designs were designed in VHDL, simulated using Modelsim simulator and Implemented using Xilinx FPGA synthesis and Synopsis ASIC synthesis tools.

关键词： Signal processing algorithms Hardware Algorithm design and analysis Clocks Mathematical model Computer architecture Field programmable gate arrays

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A Novel Framework for processing Continuous Queries on Moving Objects

A Novel Framework for Processing Continuous Queries on Movin...

引用

11th international conference on Web-Age Information Management (WAIM 2010)

作者： Zhao, Liang Jing, Ning Chen, Luo Zhong, Zhinong Natl Univ Def Technol Coll Elect Sci & Engn Changsha 410073 Hunan Peoples R China

ISBN: (纸本)9783642142451

Traditional techniques for processing continuous queries on moving objects reduce query re-computing through single-threaded and shared execution between multiple queries;and don't make use of the parallel computing capabilities of the ubiquitous multi-core CPUs. thus;to explore this kind of parallelism;a Multi-threading based Framework for Continuous Queries (MFCQ) is proposed which adopts a strategy of re-computing all of the queries periodically. the framework divides the query process into three phases:the updating;optimization and execution stages;multi-threading based methods are used in each phase. Moreover: the framework is deemed to be general;because it is compatible with various index techniques and query algorithms. By using the framework, a. query index based KNN algorithm and an object index based KNN algorithm are proposed respectively. Experimental results show that the multi-threading framework executed on the multi-core platform outperforms the traditional YPK-CNN algorithm.

关键词： multi-threading framework continuous queries KNN query grid index

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FFT algorithms Evaluation on a Homogeneous Multi-processor System-on-Chip

FFT Algorithms Evaluation on a Homogeneous Multi-processor S...

引用

international conference on parallel processing Workshops (ICPPW)

作者： Roberto Airoldi Fabio Garzia Jari Nurmi Department of Computer Systems Tampere University of Technology Tampere Finland

this paper presents the evaluation of radix-2, radix-4 and radix-8 algorithms for N-point FFTs on a homogeneous Multi-Processor System-on-Chip, prototyped on FPGA device. the evaluation of the algorithms was done analysing profiling of the algorithms in comparison to a single processor architecture. the performance were evaluated in terms of required clock cycles, achieved speed-up and parallelization efficiency. the analysis showed for each algorithm how the parallelization efficiency grows moving from small to larger FFTs. Moreover the comparison between the different implementations showed the parallelization properties of each algorithm. Radix-2 algorithm shows the best speed-up and parallelization efficiency while radix-4 gives the best performance in terms of required clock cycles.

关键词： Computer architecture Algorithm design and analysis Synchronization Signal processing algorithms Reduced instruction set computing Complexity theory Software algorithms

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Optimizing application mapping algorithms for NoCs through a unified framework

Optimizing application mapping algorithms for NoCs through a...

引用

Roedunet international conference (RoEduNet)

作者： Ciprian Radu Lucian Vinţan Advanced Computer Architecture & Processing Systems Research Lab “Lucian Blaga” University of Sibiu Romania

ISBN: (纸本)9781424473359

this paper presents a preliminary PhD research towards developing a framework to evaluate and optimize application mapping algorithms for Network-on-Chip architectures. Several such algorithms have been proposed for mapping the threads of a parallel application on a NoC architecture. However, the performance of those algorithms is evaluated only on some specific NoC designs. A unified approach for evaluating such algorithms allows a better comparison of their performance and can potentially lead to some optimizations. the proposed framework is intended to be flexible so that the algorithms can be tested on different NoC designs. To this end, a scalable and flexible Network-on-Chip simulator is proposed. Some preliminary results obtained with this simulator are presented, too. they show the flexibility of this simulator and that it is feasible for addressing the application mapping problem in a unified manner.

关键词： Network-on-a-chip Algorithm design and analysis Application software Routing Tiles Computer architecture Testing Network topology Design optimization

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Impact of PLL 1/f2 and white phase noise in RF bandpass sampling processing

Impact of PLL 1/f2 and white phase noise in RF bandpass samp...

引用

Annual IEEE Northeast Workshop on Circuits and Systems (NEWCAS)

作者： L. Lolis M. Pelissier C. Bernier D. Dallet J. B. Bégueret Radiofrequency Architectures and Circuits Laboratory CEA LETI MINATEC Grenoble France CEA Radiofrequency Architectures and Circuits Laboratory Grenoble France CNRS UMR 5218 ENSEIRB Bordeaux 1 University Bordeaux France

this work presents a new method to numerically calculate the signal to jitter distortion ratio (SDjR) for any modulated input which is bandpass sampled in the presence of jitter. the numerical method matches the derived analytical equations. It is shown that the impact of white phase noise depends on the signal center frequency and the sub sampling factor while the impact of correlated jitter depends mostly on the signal center frequency. By separating the impact of both phase noise types on the SDjR, specifications for PLL phase noise are derived for a given sampling frequency.

关键词： Jitter Phase noise Analytical models Phase locked loops Mathematical model Numerical models

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A filter-and-fan based heuristic for the scheduling problem of parallel batch-processing machines with deterioration consideration and non-identical job release times

A filter-and-fan based heuristic for the scheduling problem ...

引用

international conference on Supply Chain Management and Information Systems (SCMIS)

作者： Ying Meng Linxin Tang Liaoning Key Laboratory of Manufacturing System and Logistics The Logistics Institute Northeastern University Shenyang China

We investigate a scheduling problem for the parallel batch-processing machines with deterioration consideration and non-identical job release times. the objective is to minimize the makespan. A linear programming model is formulated. Considering the complexity of the problem, a filter-and-fan based heuristic is proposed. three neighborhoods based on the characteristics of the problem are designed and used in the filter-and-fan method. To probably avoid the search being trapped in a local optimum, a reconstructive strategy is proposed to strengthen the dispersity of solutions in the search process. A speedup strategy is also proposed to shorten the run time of the proposed method. the computational results show that for most of instances with small scale the heuristic can obtain optimal solutions. For all instances with large scale, the heuristic significantly outperform the standard commercial solver both on run time and quality of solution.

关键词： Optimal scheduling Job shop scheduling Single machine scheduling Search problems Schedules Logistics

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A new parallel video understanding and retrieval system

A new parallel video understanding and retrieval system

引用

IEEE international conference on Multimedia and Expo (ICME)

作者： Ke-yan Liu Tong Zhang Lei Wang HP Research Laboratories China HP Laboratories Palo Alto USA

In this paper, a hybrid parallel computing framework is proposed for video understanding and retrieval. It is a unified computing architecture based on the Map-Reduce programming model, which supports multi-core and GPU architectures. A key task scheduler is designed for the parallelization of computation tasks. the SVM method is used to train models for video understanding purposes. To effectively shorten the training and processing time, the hybrid computing framework is used to train large scale SVM models. the TRECVID database is used as the basic experimental content for video understanding and retrieval. Experiments were conducted on two 8-core servers, each equipped with NVIDIA Quadro FX 4600 graphics card. Results proved that the proposed parallel computing framework works well for the video understanding and retrieval system by speeding up system development and providing better performances.

关键词： Support vector machines Training Graphics processing unit Feature extraction Classification algorithms Computational modeling Computer architecture

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