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parallel algorithm of control model in continuous casting mould

Jisuanji Gongcheng/Computer Engineering 2006年第24期32卷 81-83页

作者： Zou, Yueliang Shen, Yunfu School of Computer Engineering and Science Shanghai University Shanghai 200072 China

As the numerical simulations in the continuous casting mould is characterized as high cost of calculation, time-consuming and the traditional serial algorithm is hard to meet the demand of the modern industry, MPI-based parallel algorithm is studied in this paper. The parallel algorithm of continuous casting simulation based on data-division and function-partition is given for SIMPLER algorithm. Through the result of the experiment on the Ziqiang 3000 high performance cluster computation environment, it is proved that the parallel algorithm has good parallel performance.

关键词： Continuous casting mould Control model MPI Numerical simulation parallel computation

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Advanced parallel Algorithm for System-Level EMC Modeling of High-Speed Electronic Package

Advanced Parallel Algorithm for System-Level EMC Modeling of...

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2008 IEEE International Symposium on Electromagnetic Compatibility, Pages 537-1066

作者： Er-Ping Li X. C. Wei En-Xiao Liu Zaw Zaw OO Advanced Electromagnetics and Electronics Dept A*STAR Institute of High Performance Computing Singapore

ISBN: (纸本)9781424416998

This paper presents a novel algorithm for EMC simulation of electronic package integration. This algorithm is based on hybridizing method of moments with analytical method, modal expansion technique. The entire electronic package domain is divided into two networks: the signal distribution network and the power distribution network. The signal distribution network is simulated using the method of moments, where the equivalent RLCG (resistance, inductance, capacitance and conductance) parameters of the signal traces in the signal layers are extracted. The power distribution network is simulated by using the modal expansion technique, where the equivalent circuit of the power distribution network is obtained. It is straightforward to substitute all the extracted equivalent circuit parameters into a SPICE-like simulator to simultaneously perform the signal and power integrities analyses. With the proposed method, the system-level EMC modeling of the package can be performed efficiently. Numerical examples demonstrate that this approach is able to provide fast yet accurate simulation for signal and power integrities analysis of multilayered electronic packages. In order to further enhance the simulation efficiency, the parallel process of the proposed method is implemented in our institute's high performance computer.

关键词： EMC/EMI Modeling parallel computation mode expansion method of moments equivalent circuit

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parallel MoM Using Higher Order Basis Function and PLAPACK In-Core and Out-of-Core Solvers for Challenging EM Simulations

Parallel MoM Using Higher Order Basis Function and PLAPACK I...

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2008 IEEE Antennas and Propagation Society International Symposium (APSURSI 2008), vol.1

作者： Yu Zhang Tapan K. Sarkar Robert A. van de Geijn M. Taylor EECS Syracuse University Syracuse NY USA CS University of Technology Austin TX USA

ISBN: (纸本)9781424420414

Currently, the problem size that can be solved by the Method of Moments (MoM) is limited by the amount of RAM installed on the computer. To reduce number of unknowns for MoM, a higher order polynomial function is introduced in this paper as the basis function. To further extend the capability of the MoM code, this paper also describes a newly developed out-of-core solver based on PLAPACK which breaks the memory constraint while maintaining the efficiency of in-core implementation. Results on a representative computer platform for a challenge electromagnetic problem show that the out-of-core solver introduced is an efficient way to deal with a large matrix equation. The implementation of these advancements creates a powerful tool for efficient computational electromagnetic solution of large and complex real world problems.

关键词： PLAPACK parallel computation In-core Out-of-core

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Electromagnetic Field Analysis of Rotating Machines Using 3-D parallel Finite Element Method with Prismatic Edge Elements

Electromagnetic Field Analysis of Rotating Machines Using 3-...

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International Conference on Electrical Machines and Systems

作者： Yoshihiro Kawase Tadashi Yamaguchi Shunichi Osada Department of Electrical Electronic and Computer Engineering Gifu University 1-1 Yanagido Gifu 501-1193 Japan

We developed a parallel computation method for the electromagnetic field analysis of rotating machines with the 3-D finite element method with prismatic edge elements. We clarified the usefulness of the method through... 详细信息

ISBN: (纸本)9781467388634

关键词： dynamic characteristics analysis parallel computation prismatic edge elements rotating machine

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Improvising performance of Advanced Encryption Standard Algorithm

Improvising performance of Advanced Encryption Standard Algo...

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International Conference on Mobile and Secure Services

作者： Vandan Pendli Mokshitha Pathuri Subhakar Yandrathi Abdul Razaque Department of Electrical Engineering Cleveland State University

ISBN: (纸本)9781467396875

The requirement of information security on a network has become highly challenging. Cryptography is a method to provide information confidentiality, authenticity and integrity. The cryptography overcomes several challenges such as execution time, memory requirement, and computation power. However, we cannot get desired outcomes by using sequential computation. In this paper, we introduce parallel computation using multicore processors by parallelizing the execution of the algorithm in multiple cores. We analyze the effectiveness of the Advanced Encryption Standard (AES) algorithm on dual core processor by using OpenMP API to reduce the execution time. This process is validated using JAVA platform. Based on the results, it is confirmed that parallel computation reduced execution time as compared with sequential computation.

关键词： AES Cryptography Dual-core processor OpenMP parallel computation

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Multiscale Processes of Hurricane Sandy (2012) as Revealed by the parallel Ensemble Empirical Mode Decomposition and Advanced Visualization Technology

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ADVANCES IN DATA SCIENCE AND ADAPTIVE ANALYSIS 2016年第1期8卷

作者： Shen, Bo-Wen Chueng, Samson Li, Jui-Lin F. Wu, Yu-Ling Shen, Samuel S. P. San Diego State Univ Dept Math & Stat San Diego CA 92182 USA NASA Ames Res Ctr Moffett Field CA 94035 USA CALTECH Jet Prop Lab Pasadena CA 91011 USA Univ Alabama Ctr Earth Syst Sci Huntsville AL 35899 USA

Hurricane Sandy in October 2012 is currently the second costliest tropical cyclone (TC) in the U. S. history, surpassed only by Hurricane Katrina (2005). This paper uses advanced data analysis methods and visualization technology to examine the role of multiscale processes in the initial formation and movement of Hurricane Sandy. To efficiently analyze high-resolution, global, and multiple-dimensional datasets, a parallel ensemble empirical mode decomposition (PEEMD) method is developed by implementing a multilevel parallelism into an ensemble EMD (EEMD). The augmentation resulted in a parallel speedup of 720 using 200 eight-core processors. Here, we discuss performance for the PEEMD in decomposing multiscale signals from data sets that represent: (i) idealized tropical waves and (ii) large-scale environmental flows associated with Hurricane Sandy (2012). Our results indicate that the PEEMD can efficiently reveal major wave characteristics such as wavelengths and periods within the data by sifting out the dominant (wave) components. Visualization tools have been developed to make four-dimensional (4D) visualizations of Sandy. The 4D visualizations help elucidate the following factors which led to the sinuous track of Sandy: (i) the initial steering impact of an upperlevel trough (appearing over the Northwestern Caribbean Sea and the Gulf of Mexico);(ii) the blocking impact of systems to the Northeast of Sandy;and (iii) interaction with a mid-latitude, upper-level trough that appeared at 130 degrees West longitude on October 23, moved to the east coast, and intensified from October 29-30 prior to Sandy's landfall. Both the PEEMD method and advanced visualization technology have been integrated with other modules in order to examine the statistical relationship between tropical waves and TC formation in a hurricane climate study.

关键词： Visualization parallel computation parallel ensemble empirical mode decomposition multiscale analysis hurricane sandy multiscale processes

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Ab initiocalculation of dynamic polarizability and dielectric constant of carbon and silicon cubic crystals

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Journal of computational Chemistry 1998年第10期18卷

作者： David Ayma Jean Pierre Campillo Michel Rérat Mauro Causà Laboratoire de chimie structurale UMR 5624 Université de Pau IFR rue J-Ferry 64000 Pau France Department of Inorganic Physical and Materials Chemistry University of Torino Torino Italy

Valence and conduction bands of carbon silicon cubic systems are first obtained by a process called linear combination of atomic orbitals self-consistent field (LCAO-SCF), both at the Hartree-Fock (HF) and local density approximation (LDA) levels. Then, the crystalline orbitals are used in a sum-over-states (SOS) method to calculate the corresponding dielectric constants related to electronic polarizabilities. This method allows parallel computations with large granularity of the optical properties and leads to uncoupled HF and LDA results. © 1997 John Wiley & Sons, Inc. J Comput Chem 18: 1253–1263, 1997

关键词： ab initio LCAO-SCF calculation Hartree-Fock (HF) and local density approximation (LDA) methods frequency-dependent dielectric constant parallel computation diamond and silicon semiconductors

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An algebraically partitioned FETI method for parallel structural analysis: performance evaluation

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International Journal for Numerical Methods in Engineering 1998年第15期40卷

作者： Manoel R. Justino JR K. C. Park Carlos A. Felippa Center for Aerospace Structures and Department of Aerospace Engineering Sciences Campus Box 429 University of Colorado Boulder CO 80309-429 U.S.A.

This paper presents the algorithmic performance of an algebraically partitioned Finite Element Tearing and Interconnection (FETI) method presented in a companion paper. A simple structural assembly topology is employed to illustrate the implementation steps in a Matlab software environment. Numerical results indicate that the method is scalable, provided the iterative solution preconditioner employs the reduced interface Dirichlet preconditioner. A limited comparison of the present method with the differentially partitioned FETI method with corner modes is also offered. Based on this comparison and a reasonable extrapolation, we conclude the present algebraically partitioned FETI method possesses a similar iteration convergence property of the differentially partitioned FETI method with corner modes. © 1997 John Wiley & Sons, Ltd.

关键词： parallel computation algebraic partitioning domain decomposition structural analysis finite element method iterative solution

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A parallel Block Scaled Gradient Method With Decentralized Step-Size For Block Additive Unconstrained Optimization Problems Of Large Distributed Systems

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Asian Journal of Control 2008年第1期5卷

作者： Shin-Yeu Lin Shieh-Shing Lin Department of Electrical and Control Engineering National Chiao Tung University Hsinchu 30039 Taiwan. Shin-Yen Lin received the B.S. degree in electronic engineering from National Chiao Tung University the M.S. degree in electrical engineering from the University of Texas at E1 Paso and the D.Sc. degree in systems science and mathematics from Washington University in St. Louis Missouri in 1975 1979 and 1983 respectively. From 1991 to the present he has been a Professor in the Department of Electrical and Control Engineering at National Chiao Tung University. His major research interests are Computational Intelligence Optimization Theory and Applications and Large-scale Power Systems.

In this paper, we propose a modified parallel block scaled gradient method for solving block additive unconstrained optimization problems of large distributed systems. Our method makes two major modifications to the typical parallel block scaled gradient method: First, we include a pre-processing step which reduces the computational time; second, we propose a decentralized Armijo-type step-size rule. This rule circumvents the difficulty of determining a step-size in a distributed computing environment and enables the proposed parallel algorithm to execute in a distributed computer network with a limited amount of data transfer. We have applied our method to the weighted-least-square problems of power system state estimation and demonstrated the convergence of our method by testing numerous examples on a PC network. The speedup ratio of the distributed version of our method tends to increase proportionally with the number of subsystems (or computers).

关键词： Unconstrained optimization nonlinear programming parallel computation large distributed systems least-square problems

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New distributed implementation of the FDTD method

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Electronics and Communications in Japan (Part II: Electronics) 1998年第5期80卷

作者： Naoki Takada Katunori Ando Kuniyuki Motojima Tomoyoshi Ito Shogo Kozaki Department of Electronic Control Engineering Oyama National College of Technology Oyama Japan 323 Japan Radio Co. Ltd. Tokyo Japan 181 Faculty of Engineering Gunma University Kiryu Japan 376

The FDTD method is a numerical technique that can be used to solve electromagnetic boundary value problems in the time domain. This method is excellent in computational efficiency, practicality, and simplicity. In recent years, we have frequently used this method in order to analyze antennas, electromagnetic scattering problems, and so on. However, the electromagnetic boundary value problems which we can analyze by this method are limited because computer memory is limited. In order to overcome this important problem, Rodohan and colleagues recently developed the distributed FDTD method. In this method, the necessary computer memory is provided by several computers and we can analyze problems which need a large computer memory space. In this paper, we first propose a new distributed FDTD method in which the number of communications and the communication costs except for absorbing boundary conditions are half those of the Rodohan method and the absorbing boundary conditions are highly accurate. Second, when we calculated the scattering of a plane wave by a square conducting cylinder with our method and the conventional FDTD method, the results were in agreement. We confirmed the high speed of calculations with our method. Finally, we were able to show the validity and the effect of our method. © 1997 Scripta Technica, Inc. Electron Comm Jpn Pt 2, 80(5): 8–16, 1997

关键词： FDTD method distributed FDTD method absorbing boundary parallel computation computer memory

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