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Iterative Reconstruction of CT Images with PETSc

Iterative Reconstruction of CT Images with PETSc

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2011 4th International Conference on Biomedical Engineering and Informatics(第四届生物医学工程与信息学国际会议 BMEI 2011)

作者： Liubov Flores Vicent Vidal Patricia Mayo Francisco Rodenas Gumersindo Verdii Polytechnic University of Valencia Valencia Spain

In X-ray computed tomography (CT) the X rays are used to obtain the projection data needed to generate an image of the inside of an object. The image can be generated with different techniques. Algebraic methods are more suitable for the reconstruction of images with high contrast and precision in noisy conditions and from a small number of projections. Their use may be important in portable scanners for their functionality in emergency situations. However, in practice, these methods are not widely used due to the high computational cost of their implementation. In this work we analyze and propose the usage of the PETSc library for the optimal usage of a system in the parallel reconstruction of images. Also, the quality comparison of the images reconstructed with both methods, analytical Filtered Back projection (FBP) and iterative LSQR, has been performed.

关键词： CT image reconstruction parallel algorithm PETSc library

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Distributed Model Predictive Control for Optimal Consensus of Constrained Multi-agent Systems

Distributed Model Predictive Control for Optimal Consensus o...

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第42届中国控制会议

作者： Nan Bai Qishao Wang Zhisheng Duan Department of Mechanics and Engineering Science Peking University Department of Dynamics and Control Beihang University

This paper develops a framework based on distributed model predictive control to solve the optimal consensus problem for constrained multi-agent systems. Taking both transient performance and final consensus state into consideration, the optimization problem in each prediction horizon is formed as a coupled optimization problem containing a non-separable cost function with constraints. An efficient distributed algorithm is proposed with the distributed convergence conditions on the auxiliary parameters, which makes each agent solve its subproblems in parallel iterations, enhancing the running efficiency of the algorithm. The stability of the closed-loop system is analyzed, providing distributed stability conditions that only depend on the local information of each agent. Numerical simulations verify the validity of theoretical results by utilizing the proposed approach to a multi-robot system.

关键词： Distributed Model Predictive Control Distributed Optimization Multi-agent System parallel algorithm

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The algorithm Flow of Generating 3D Seismic Data Volume in Tarim Area by Using Acoustic Equation

The Algorithm Flow of Generating 3D Seismic Data Volume in T...

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2011 4th International Congress on Image and Signal Processing(第四届图像与信号处理国际学术会议 CISP 2011)

作者： Taoran Liu Runqiu Wang College of Geophysics and Information Engineering China University of Petroleum Beijing Beijing China

According to the real geology background of Tarim foreland basin we build 3D seismic data volume of Tarim area by using 3D arbitrary difference precise integration (ADPI) algorithm. It is very beneficial for the processing and explanation of 3D seismic material of Tarim area. Compared with conventional differential method, the 3D ADPI algorithm greatly improves the precision by using local integral semianalytical method in time domain to get the recursion operator of wave equations. And we adopt stable factor constraints, thus the stability of calculation gets much better. By using an improved adaptive absorbing boundary and the parallelization of serial program, the time consuming of 3D forward modeling is greatly reduced. In the research we gathered 300 shots' Omni-directional seismic data volume. The whole data volume approximates 2T. Compare the geology model with actual seismic records we find 3D ADPI forward modeling can accurately show the structure and layers information of geology model. In complex region it can describe geology structure and seismic physical parameters such as amplitude, frequency, phase and so on.

关键词： arbitrary difference precise integration 3D forward modeling parallel algorithm wave equation

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GPU implementation of the multi depot Vehicle Routing Problem

GPU implementation of the multi depot Vehicle Routing Proble...

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IEEE/ACS International Conference on Computer Systems and Applications

作者： Abdelhamid Benaini Achraf Berrajaa El Mostafa Daoudi Lab. LMAH Normandie Université FST 25 Rue Philippe Lebon 76063 le Havre France Lab. LaRI Faculte des sciences Université Mohammed Premier Oujda Morocco

ISBN: (纸本)9781509004799

We present a parallel implementations on GPU of an heuristic for solving the Vehicle Routing Problem (VRP) with single and with multi depot. To our knowledge, this is the first GPU implementation of such class of heuristics. Our solution for the classical VRP computes in parallel an initial solution (tours) and then iteratively it improves the costs of all pairs of neighbor tours. The multi depot case is solved by decomposing the problem in several independent basic VRP that we solve in parallel. Obtained experimental results under CUDA show that the proposed implementations exploit efficiently the parallelism and the power of the GPU.

关键词： VRP Multi Depot parallel algorithm GPU CUDA Vascular Endothelial Growth Factor C parallel algorithms GRAPPER PICK UP Graphics Processing Unit Heuristics WAREHOUSE Vehicle routing

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An Implementation of Quarter Pixel Block Motion Estimation Using SIMD

An Implementation of Quarter Pixel Block Motion Estimation U...

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2004 International Symposium on Distributed Computing and Applications to Business, Engineering and Science

作者： Xinchen Zhang Ruimin Hu Deren Li Zhongyuan Wang The Key Laboratory of Multimedia and Network Communications Engineering, Hubei Province,Wuhan University Wuhan,Hubei 430072,China

For improving video coding efficiency,sub-pixel motion estimation(ME) is used extensively in the existing video coding *** quarter pixel ME is one of the high complexity tools in H.264/*** this paper,a parallel quarter block motion estimation algorithm that not only accelerates the process of sub-pixel motion estimation but also maintains accuracy as that of the original algorithm is *** Intel P4 CPU,the SIMD(single instruction multiple data) technique is commonly used to provide an execution *** implementation of this algorithm using parallel processing on P4 platform is *** proposed algorithm satisfies in particular the requirements of low-rate real-timed video *** results show that the optimized video encoder is more than 13.5 times faster than the original reference software while keeping the accuracy of the latter approximately.

关键词： Sub-pixel Block Motion Estimation Computation Complexity parallel algorithm SIMD H.264/AVC

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BLOCK SYSTOLIC COMPUTATIONS IN DIGITAL FILTERS

BLOCK SYSTOLIC COMPUTATIONS IN DIGITAL FILTERS

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计算机，通信，控制与电力工程国际会议

作者： C.J.Hwang Depart of CESYuan-Ze Institute of Technology

Many efficient systolic algorithms in block computation of digital filters have been *** highly concurrent structures can be implemented from these block systolic computation *** the performances of these highly concurrent structures would be described with the total computation times and the total processors numbers needed for each algorithms.A comparision with the sequential algorithms using the tables of speedup rate and efficiency for each block algorithm were summarized.

关键词： Systolic Array Architecture parallel algorithm Block Implementation.

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List all Maximal Cliques of an Undirected Graph:A Parallable algorithm

List all Maximal Cliques of an Undirected Graph:A Parallable...

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作者： Xin hua Maosheng Zhong Qun Liu Mingwen Wang School of Compute and Information Engineering Jiangxi Normal University School of Computing Dublin City University

Listing all the maximal cliques of an undirected graph is considered as a NP-complete problem,even if the existing fastest algorithm for listing all the maximal cliques also needs an exponential time complexity,and these algorithms are not able to be reconstructed into parallel processing algorithms,therefore,which are also unsuited to solve all maximal cliques of a complex undirected graph with a large number of maximal cliques or *** paper aims to develop a parallable algorithm for listing all maximal cliques of the large size complex undirected *** we gave some definitions,including adjacent sub-graph,suspended sub-graph and so on,then adopted a partition and recursive strategy to partition equivalently a parent-graph into smaller sub-graphs,so we can get all maximal cliques of parent-graph by recursively listing all maximal cliques of *** have developed a single-thread and a multi-thread program of the algorithm by using Java ***,we compared the performance of our algorithm in a benchmark data set DIMACS with the existing main *** results show that our single-thread program is basically equivalent performance with existing algorithms,but the multi-thread program has better performance than the existing *** our method is to divide the complex problem into some smaller sub-problems and achieve the solution of the original problem by solving these sub-problems,our algorithm is easy to be implemented by using multi-thread,and also easy to be expanded to the parallel algorithm,which has better feasibility and practicability in solving the large scale complex graph.

关键词： Listing all maximal cliques Partition and recursive strategy Adjacent sub-graph Suspended sub-graph parallel algorithm graph theory

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Random Search algorithm for the Generalized Weber Problem

Random Search Algorithm for the Generalized Weber Problem

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Conference on Computer Science and Software Engineering(CSSE 2012)

作者： Lev Kazakovtsev Department of Information Technologies Siberian State Aerospace University

In this paper, we consider the planar multi-facility Weber problem with restricted zones and non-Euclidean distances, propose an algorithm based on the probability changing method (special kind of genetic algorithms) and prove its efficiency for approximate solving this problem by replacing the continuous coordinate values by discrete ones. Version of the algorithm for multiprocessor systems is proposed. Experimental results for a high-performance cluster are given.

关键词： Discrete Optimization Weber Problem Random Search Genetic algorithms parallel algorithm

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LATTICE BOLTZMANN MODEL OF ANISOTROPIC DIFFUSION FOR IMAGE DENOISING

LATTICE BOLTZMANN MODEL OF ANISOTROPIC DIFFUSION FOR IMAGE D...

引用

2010 IEEE Youth Conference on Information,Computing and Telecommunications(2010 IEEE青年信息、计算和通信技术大会)

作者： George Chen ZhiQiang Wang ZhuangZhi Yan YueHong Qian Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China School of Communication and Information Engineering Shanghai University Shanghai 200072 China Shanghai Institute of Applied Mathematics and Mechanics Shanghai 200072 China

To overcome the inefficiency of the traditional numerical methods that implement the anisotropic diffusion model for image denoising, a novel lattice Boltzmann model of anisotropic diffusion is presented in this paper. In the model, the diffusion rate is adapted to the image itself and independently set for each direction of diffusion. The mass accumulation is calculated through a weighted summation of the particle distribution functions. Our method is stable with large iteration steps thus reducing the iteration steps greatly. The experiment results showed that compared to others, our approach performs better in terms of the resulting images as well as computing efficiency. In addition, our approach is easy for parallel implementation.

关键词： Image denoising Lattice Boltzmann method Anisotropic diffusion parallel algorithm

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The Comparison of Red-Black Ordering and Natural Ordering Application in Special Linear System

The Comparison of Red-Black Ordering and Natural Ordering Ap...

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The Sixth International Conference of Matrices and Operators

作者： Yan-jun Du Quan-yi Lv Xiu-min Liu Department of Mathematics Northwestern Polytechnical University

The comparison of red-black ordering and natural ordering in solving linear system in parallel is presented in this *** is proved that red-black ordering can keep the convergence of linear system and improve the parallelism through theoretical *** reach the load balancing and reduce communication, the data is stored by blocks and the communication is proceeded between the adjacent *** this way, it is avoided that the time increases too much with the number of processors increasing,which improve the computation efficiency.

关键词： red-black ordering natural ordering parallel algorithm

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