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parallel AND DISTRIBUTED TLM COMPUTATION WITH SIGNAL-PROCESSING FOR ELECTROMAGNETIC-FIELD MODELING

INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1995年第3-4期8卷 169-185页

作者： SO, PPM ESWARAPPA, C HOEFER, WJR NSERC/MPR Teltech Research Chair in RF Engineering Department of Electrical and Computer Engineering University of Victoria Victoria British Columbia V8W 3P6 Canada Poman So received his B.Sc. degree in computer science and physics from the University of Toronto Toronto Onatario Canada in 1985. He obtained his B.A. Sc. and M.A.Sc. degrees in electrical engineering (summa cum laude) from the University of Ottawa Ottawa Ontario Canada in 1987 and 1989 respectively. Mr So was a research engineer in the University of Ottawa from January 1989 to October 1991 his research interests included CAD techniques of microwave circuits and numerical methods for electromagnetic wave modelling. He specialized in the development of electromagnetic engineering CAD software and successfully implemented a number of electromagnetic wave simulators based on the two-dimensional and three-dimensional transmission-line matrix methods. From August 1990 to February 1991 he accompanied Professor W. J. R. Hoefer to Rome Italy and Sophia Antiopolas France. During that time he implemented a parallel version of the 3D-TLM simulator for the CM-2 Connection Machine using C-Star and X Windows Library. He is a research engineer and a Ph.D. student at the University of Victoria Victoria British Columbia Canada. He ported the 2D- and 3D-TLM simulators to DECmpp 1200 massively parallel computer using MPL C and C++. He also combined OSA90/hope a commercially available microwave CAD program with a 2D-TLM simulation module for geometry optimization using the Datapipe technique of OSA90/hope. Recently he has developed a distributed client-server computing technique for the TLM method this technique could accelerate the TLM simulation by more than an order of magnitude. Channabasappa Eswarappa received the M.Tech. degree in electrical engineering from the Indian Institute of Technology Kanpur India in 1983 and Ph. D. degree from the University of Ottawa Canada in 1990. He worked as an Assistant Executive Engineer and later as

This paper describes the implementation of transmission-line matrix (TLM) method algorithms on a massively parallel computer (DECmpp 12000), the technique of distributed computing in the UNIX environment, and the combination of TLM analysis with Prony's method as well as with autoregressive moving average (ARMA) digital signal processing for electromagnetic field modelling. By combining these advanced computation techniques, typical electromagnetic field modelling of microwave structures by TLM analysis can be accelerated by a few orders of magnitude.

关键词： Mathematical models

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Multiagent fault‐diagnosis expert system in power systems

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European Transactions on electrical Power 1995年第5期5卷 341-347页

作者： Wang, J.P. Trécat, J. Dr. Jianping Wang is a doctor fellow in the Faculte Polytechnique de Mons in Belgium. His current research field is parallel processing applications in power systems. Dr. Wang obtained his BS degree from Southwest Jiaotong University in P.R. Chinain 1982. From 1982 to 1990 he was appointed as an assistant lecturer. lecturer and associate professor respectively in the electrical engineering department of Southwest Jiaotong University. He obtained his Ph.D in the FacultC Polytechnique de Mons in July of 1993. (BD Dolez 3 1 FPMS B-7000 Mons Belgium T +32-65/37 41 87 Fax +32-65/37 43 00) Professor J. Trécat is a director in the power system laboratory in the Faculty Polytechnique de Mons. He obtained his Ph.D in the University of Manchester Institute of Science and Technology(UM1ST) in U.K. in 1970. He has been working in the fields of power system automation artificial intelligence application and computer vision in the Facult6 Polytechnique de Mons since 1970. He is a senior member of IEEE and he has made much contribution both in electrical engineering education and research. (BD Dolez 3 I FPMS B-7000 Mons T +32-651374185. Fax +32-6513743 00)

In order to solve the speed problem and shallow reasoning problem met in current research in fault diagnosis expert system, this paper presents a model based parallel fault diagnosis expert system for energy management systems (EMS). The Petri net model, which corresponds to the relationship between power system components and their protection systems, has been used for the inference in fault diagnosis. A multiagent parallel processing expert system, which is based on five transputers in Sun workstation, has been built for fault diagnosis purposes. The test results show that this expert system is not only fast but also has better performances. Copyright © 1995 John Wiley & Sons, Ltd.

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MANIPULATIONS OF OCTREES AND QUADTREES ON MULTIPROCESSORS

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International Journal of Pattern Recognition and Artificial Intelligence 1994年第2期8卷 439-455页

作者： VIPIN CHAUDHARY K. KUMARI P. ARUNACHALAM J.K. AGGARWAL Parallel and Distributed Computing Laboratory Department of Electrical and Computer Engineering Wayne State University Detroit MI 48202 USA Sun Microsystems 2820 Orchard Parkway San Jose CA 95134 USA Computer and Vision Research Center Department of Electrical and Computer Engineering University of Texas at Austin Austin Texas 78712–1084 USA

Octrees offer a powerful means for representing and manipulating 3-D objects. This paper presents an implementation of octree manipulations using a new approach on a shared memory architecture. Octrees are hierarchical data structures used to model 3-D objects. The manipulation of these data structures involves performing independent computations on each node of the octree. Octrees are much easier to deal with than other forms of representations used to model 3-D objects especially where extensive manipulations are involved. When these operations are distributed among multiple processing elements (PEs) and executed simultaneously, a significant speedup may be achieved. Manipulations such as a complement, a union, an intersection and other operations such as finding the volume and centroid which this paper describes are implemented on the Sequent Balance multiprocessor. In this approach the PEs are allocated dynamically, resulting in a uniform load balancing among them. The experimental results presented illustrate the feasibility of the approach. Although this evaluation has been originally done for shared memory machines, it will provide insight for the evaluation of other architectures.

关键词： Shared memory architecture dynamic allocation union intersection orthogonal views

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Critical performance path analysis, and efficient code generation issues, for the Seamless architecture

Critical performance path analysis, and efficient code gener...

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International Symposium on parallel Processing

作者： D.L. Bright S.A. Fineberg B.H. Pease M.L. Roderick S. Sundaram T.L. Casavant Parallel Processing Laboratory Department of Electrical and Computer Engineering University of Iowa Iowa IA USA Numerical Aerodynamic Simulation NASA Ames Research Center CA USA

An analytical study of potential pathological performance areas of the Seamless architecture is presented. Seamless is a latency-tolerant, distributed memory, multiprocessor architecture. A key component of the philosophy of Seamless, however, is the use of standard, commodity components for a large part of the system. A discussion of the unavoidable implementation compromises imposed by this decision is presented, followed by a summary of some optimistic performance studies. Then an analytical study that parameterizes the predicts the worst-case impact of using standard components is provided. Finally, it is shown that these bottlenecks are manageable via careful generation of target machine code so that the optimistic performance studies become realistic expectations for a range of program behaviors and granularities.< >

关键词： Performance analysis computer architecture Hardware Reduced instruction set computing Workstations Costs Aerodynamics Computational modeling Analytical models Numerical simulation

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Application of QR decomposition-based least squares technique to improve air traffic control radar

Application of QR decomposition-based least squares techniqu...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： T. Ogunfunmi Nam Ling Signal and Image Processing Laboratory (SIPL) Department of Electrical Engineering Santa Clara University Santa Clara CA USA Computer Systems and Parallel Processing Research Laboratory (CSPPRL) Department of Computer Engineering Santa Clara University Santa Clara CA USA

For real-time radar processing, it is very desirable to have an algorithm that does not assume restricted statistics of the input data and can be implemented for high-speed processing (without a high cost) to meet real-time requirements. We therefore apply the QR decomposition-based least-squares method for linear prediction to the problem of computing the reflection coefficients of a lattice predictor, instead of using the conventional Burg algorithm. We also propose a modified one-dimensional ring architecture for implementing the QR method of least-squares. The particular application considered in this case is that of surveillance radar systems for air traffic control.< >

关键词： Least squares methods Air traffic control Radar applications Signal processing algorithms Radar signal processing Statistics Systolic arrays Radar imaging Signal processing Surveillance

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Applying parallel block predictor-corrector methods to a Space Shuttle main rocket engine simulation

Applying parallel block predictor-corrector methods to a Spa...

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IEEE Southeastcon

作者： B.E. Wells C.C. Carroll Computer Architecture Research Laboratory Department of Electrical Engineering University of Alabama USA

The effectiveness of applying two types of parallel block predictor-corrector algorithms presented by L.F. Shampine and H.A. Watts (Math. Comput., vol.23, p.731-40, 1969; BIT, vol.12, p.252-66, 1972) and L.G. Birta and O. Abdou-Rabia (IEEE Trans. on Comput. vol.C-36, no.3, p.299-311 March 1987) to the simulation of a Space Shuttle main rocket engine is discussed. Comparisons between the sequential and parallel versions of the algorithms are made, based upon implementations of Shuttle main engine simulations on a four-node multiple-instruction multiple-data parallel processing environment consisting of Inmos T800 transputers. The results of these simulations are reported in terms of certain performance measurements, including execution time, processor utilization, simulation accuracy and simulation stability. The expected performance of expanded versions of the algorithms which employ more than four transputers is also calculated assuming a hypercube-type topology.< >

关键词： Space shuttles Rockets Engines Predictive models Stability Computational modeling Topology parallel algorithms Aerospace simulation computer simulation

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An implementation of a barotropic numerical weather prediction model in the functional language SISAL 90

An implementation of a barotropic numerical weather predicti...

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2nd ACM SIGPLAN Symposium on Principles and Practice of parallel Programming, PPOPP 1990

作者： Chang, Pau S. Egan, Gregory K. Jt. Roy. Melbourne Inst. of Technol. and Cmw. Scientific and Industrial Research Organisation Parallel Systems Architecture Project Australia Royal Melbourne Institute of Technology Dept of Communication and Electrical Engineering 124 La Trobe St. Melbourne3000 Australia Department of Computer Systems Engineering Swinburne Institute of Technology School of Electrical Engineering John Street Hawthorn3122 Australia

ISBN: (纸本)0897913507

Numerical Weather Prediction (NWP) is acknowledged as being of vital importance to economy. The demand that NWP places on computing system performance has increased dramatically since the introduction of computer systems and is siili growing. This paper describes the implementation of a one-level barotropic spectral NWP model using the high level functional language SISAL. Our initial approach was a direct transliteration from FORTRAN to SISAL, the result of which was a large amount of array copying and loss of parallelism. The algorithm of the model was then rearranged to enable effective exploitation of parallelism by an optimising SISAL compiler. The parallel implementation technique and its potential for modeling with larger model sizes are discussed, and the improved results for an Encore Multimax multiprocessor are presented. © 1990 ACM.

关键词： High level languages

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computer architecture for intelligent, real-time, numeric and symbolic processing

Computer architecture for intelligent, real-time, numeric an...

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Frontiers of Massively parallel Computation

作者： R.K. Mahadevan C.C. Carroll Computer Architecture Research Laboratory Department of Electrical Engineering University of Alabama Tuscaloosa AL USA

An architecture to provide for the expert control of numerical processing is described. Simulations run to explore the possibility of using parallelism show positive results in the areas of numerical processing and expert symbolic processing. The architecture presented, while multiple-instruction multiple-data (MIMD) massively parallel, is an optimum parallel environment for real-time applications and follows the idea of intelligent processing to create a coupled system to support real-time simulation and control tasks.< >

关键词： computer architecture Computational modeling Mathematical model Real time systems Application software computer simulation Iterative algorithms Laboratories Process control Concurrent computing

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An analysis of hypercube architectures for image pattern recognition algorithms

An analysis of hypercube architectures for image pattern rec...

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Image Pattern Recognition: Algorithm Implementations, Techniques, and Technology 1987

作者： Mudge, T.N. Advanced Computer Architecture Laboratory Robot Research Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109-2122 United States

Hypercube architectures are introduced. The reasons behind their becoming the first widespread commercial massively parallel processors are outlined. A classification for image pattern recognition is proposed and characteristic algorithms are presented. Some simple ideas for organizing these algorithms to execute efficiently on hypercubes are also presented. The current programming model for hypercube machines is explained and illustrated with one of the characteristic algorithms. Preliminary performance figures are discussed for the NCUBE/six, a 64 processor commercial hypercube, followed by some concluding remarks. © 1987 SPIE. All rights reserved.

关键词： Geometry

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