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IEEE International Symposium on Intelligent Control (ISIC)

作者： Chen Guo M.A. Simaan Zengqi Sun Lab of Simulation and Control of Navigation Systems Dalian Maritime University Dalian China Department of Electrical Engineering University of Pittsburgh Pittsburgh PA USA Department of Computer Science and Technology Tsinghua University Beijing China

In this paper, we present an Adaptive Network-based Fuzzy Inference System (ANFIS), based on a neuro-fuzzy controller, as a possible control mechanism for a ship stabilizing fin system. simulation results show that ANFIS can effectively improve the ship stabilizing performance against roll motion in cases of rough sea conditions. it is a promising alternative to conventional PID controllers.

关键词： Motion control Marine vehicles Control systems Fuzzy control Fuzzy systems Three-term control Transfer functions Modeling Electronic mail Adaptive systems

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Global and localized parallel preconditioning techniques for large scale solid Earth simulations

Global and localized parallel preconditioning techniques for...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： Kai Wang Sangbae Kim Jun Zhang K. Nakajima H. Okuda Laboratory for High Performance Scientific Computing and Computer Simulation Department of Computer Science University of Kentucky Lexington KY USA Research Organization for Information Science and Technology Meguro Tokyo Japan Department of Quantum Engineering and System Sciences University of Tokyo Bunkyo Tokyo Japan

We investigate and compare a few parallel preconditioning techniques in the iterative solution of large sparse linear systems arising from solid Earth simulation with and without using contact information in the domain partitioning process. Previous studies are focused on using static or matrix pattern based incomplete LU (ILU) preconditioners in a localized preconditioner implementation. Our current studies are concerned with preconditioner performance for solving two different cases with and without known contact information. For the cases with contact information, we use localized threshold value based incomplete LU (ILUT) preconditioner to improve efficiency. For the cases without contact information, we use a global sparse approximate inverse preconditioner with a static sparsity pattern to achieve robustness. Numerical results from simulating ground motion on a parallel supercomputer are given to compare the effectiveness of these parallel preconditioning techniques.

关键词： Large-scale systems Earth Solid modeling Linear systems Sparse matrices Computational modeling computer simulation Uniform resource locators Geoscience Information science

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3-D flame temperature field reconstruction with multiobjective neural network

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Chinese Optics Letters 2003年第2期1卷 78-81页

作者：万雄高益庆汪元美 Institute of Automation of Nanjing University of Aeronautics and Astronautics Nanjing 210016 Department of Test and Control Engineering Nanchang Institute of Aeronautical Technology Nanchang 330034 Department of Test and Control Engineering Nanchang Institute of Aeronautical Technology Nanchang 330034 Department of Test and Control Engineering Nanchang Institute of Aeronautical Technology Nanchang 330034 novel 3-D temperature field reconstruction method is proposed in this paper which is based on multi-wavelength thermometry and Hopfield neural network computed tomography. A mathematical model of multi-wavelength thermometry is founded and a neural network algorithm based on multiobjective optimization is developed. Through computer simulation and comparison with the algebraic reconstruction technique (ART) and the filter back-projection algorithm (FBP) the reconstruction result of the new method is discussed in detail. The study shows that the new method always gives the best reconstruction results. At last temperature distribution of a section of four peaks candle flame is reconstructed with this novel method.

A novel 3-D temperature field reconstruction method is proposed in this paper, which is based on multi-wavelength thermometry and Hopfield neural network computed tomography. A mathematical model of multi-wavelength thermometry is founded, and a neural network algorithm based on multiobjective optimization is developed. Through computer simulation and comparison with the algebraic reconstruction technique (ART) and the filter back-projection algorithm (FBP), the reconstruction result of the new method is discussed in detail. The study shows that the new method always gives the best reconstruction results. At last, temperature distribution of a section of four peaks candle flame is reconstructed with this novel method.

关键词： Mathematical models Neural networks Spectrum analysis

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Semiconductor supply network simulation

Semiconductor supply network simulation

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simulation Winter Conference

作者： Godding Sarjoughian Kempf Component Automation Systems Intel Corporation Chandler AZ USA Arizona Center for Integrative Modeling & Simulation Computer Science & Engineering Department Arizona State University Tempe AZ USA Decision Technologies Intel Corporation Chandler AZ USA

More efficient and effective control of supply networks is conservatively worth billions of dollars to the national and world economy. Developing improved control requires simulation of physical flows of materials involved and decision policies governing these flows. We describe our initial work on modelling each of these flows as well as simulating their integration through the synchronized interchange of data. We show the level of abstraction that is appropriate, formulate and test a representative model, and describe our findings and conclusions.

关键词： Testing Production facilities Computational modeling Raw materials Customer service Costs Material storage Network topology Scalability Automation

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Scalability of a low-cost multi-Teraflop Linux cluster for high-end classical atomistic and quantum mechanical simulations

Scalability of a low-cost multi-Teraflop Linux cluster for h...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： H. Kikuchi R.K. Kalia A. Nakano P. Vashishta F. Shimojo S. Saini Concurrent Computing Laboratory for Materials Simulations Biological Computation and Visualization Center Department of Computer Science Department of Physics & Astronomy Louisiana State University Baton Rouge LA USA Collaboratory for Multiscale Simulations Department of Computer Science Department of Physics & Astronomy Department of Materials Science Department of Biomedical Engineering University of Southern California Los Angeles CA USA Faculty of Integrated Arts and Sciences Hiroshima University Higashi Hiroshima Japan IT Modeling and Simulation NASA Ames Research Center Moffett Field CA USA

Scalability of a low-cost, Intel Xeon-based, multi-Teraflop Linux cluster is tested for two high-end scientific applications: Classical atomistic simulation based on the molecular dynamics method and quantum mechanical calculation based on the density functional theory. These scalable parallel applications use spacetime multiresolution algorithms and feature computational-space decomposition, wavelet-based adaptive load balancing, and spacefilling-curve-based data compression for scalable I/O. Comparative performance tests are performed on a 1024-processor Linux cluster and a conventional higher-end parallel supercomputer, 1184-processor IBM SP4. The results show that the performance of the Linux cluster is comparable to that of the SP4. We also study various effects, such as the sharing of memory and L2 cache among processors, on the performance.

关键词： Scalability Linux Quantum mechanics Computational modeling Testing Density functional theory Clustering algorithms Concurrent computing High performance computing Load management

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Human systems integration and advanced technology in engineering department workload and manpower reduction

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NAVAL ENGINEERS JOURNAL 2003年第1期115卷 57-65页

作者： Lively, KA Seman, AJ Kirkpatrick, M KENNETH A. LIVELY graduated from the University of Colorado with a BS in applied mathematics and an MS in mathematics in 1976 and from the Massachusetts Institute of Technology with an MS in electrical engineering and the degree ocean engineer in naval architecture and marine engineering in 1984. He retired from the U.S. Navy in 1989 after 23 years of service. Assignments included electrical officer on the USS Constellation (CV 64) project engineer for the DDG 51 machinery control system (NAVSEA) and DDG 51 Technical Director (NAVSEA). He was vice president of the PDI Division of Bird-Johnson Company from July 1989 to November 1998 where he managed various gas turbine and machinery controls related development projects. He joined Anteon Corporation's Systems Engineering Group as senior controls engineer in December 1998 where he provided technical support to the integrated power systems program (NAVSEA PMS 510) and managed the Office of Naval Research Afloat Laboratory. DR. MARK KIRKPATRICK is currently an independent consultant in human factors and work-load/manning analysis and modeling. He holds a Ph.D. degree in experimental psychology from The Ohio State University and has 34 years of experience in applied human factors. From 1982 through 2000 Dr. Kirkpatrick served as the senior vice president of Carlow International. Prior to joining Carlow in 1982 Dr. Kirkpatrick served as a member of the technical staff at North American Rockwell's Missiles Division and as a project director and vice president for Essex Corporation. His areas of expertise include workload simulation task analysis operator-in-the-loop simulation human performance experimentation statistical analysis and human factors T&E. He has directed and/or participated in human factors projects for the U.S. Navy U.S. Army NASA Department of Transportation the U.S. Nuclear Regulatory Commission and private industry. ANTHONY J. SEMAN III is the technical manager for the reduced ship's crew by virtual presence (RSVP) advanced technology d

Aboard current ships, such as the DDG 51, engineering control and damage control activities are manpower intensive. It is anticipated that, for future combatants, the workload demand arising from operation of systems under conditions of normal steaming and during casualty response will need to be markedly reduced via automated monitoring, autonomous control, and other technology initiatives. Current DDG 51 class ships can be considered as a manpower baseline and under Condition III typical engineering control involves seven to eight watchstanders at manned stations in the Central Control Station, the engine rooms and other machinery spaces. In contrast to this manning level, initiatives such as DD 21 and the integrated engineering plant (IEP) envision a partnership between the operator and the automation system, with more and more of the operator's functions being shifted to the automation system as manning levels decrease. This paper describes some human systems integration studies of workload demand reduction and, consequently, manning reduction that can be achieved due to application of several advanced technology concepts. Advanced system concept studies in relation to workload demand are described and reviewed including. Piecemeal applications of diverse automation and remote control technology concepts to selected high driver tasks in current DDG 51 activities. Development of the reduced ship's crew by virtual presence system that will provide automated monitoring and display to operators of machinery health, compartment conditions, and personnel health. The IEP envisions the machinery control system as a provider of resources that are used by various consumers around the ship. Resource needs and consumer priorities are at all times dependent upon the ship's current mission and the availability of equipment pawnbrokers.

关键词： Naval warfare

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Collaborative simulation grid: Multiscale quantum-mechanical/classical atomistic simulations on distributed PC clusters in the US and Japan

Collaborative simulation grid: Multiscale quantum-mechanical...

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2002 IEEE/ACM Conference on Supercomputing, SC 2002

作者： Kikuchi, Hideaki Kalia, Rajiv K. Nakano, Aiichiro Vashishta, Priya Iyetomi, Hiroshi Ogata, Shuji Kouno, Takahisa Shimojo, Fuyuki Tsuruta, Kenji Saini, Subhash Computer Science Department Department of Materials Science Department of Physics and Astronomy Department of Biomedical Engineering University of Southern California United States Concurrent Computing Laboratory for Materials Simulations Department of Computer Science Department of Physics and Astronomy Louisiana State University United States Department of Physics Niigata University Japan Department of Applied Sciences Yamaguchi University Japan Faculty of Integrated Arts and Sciences Hiroshima University Japan Department of Electrical and Electronic Engineering Okayama University Japan IT Modeling and Simulation NASA Ames Research Center United States

ISBN: (纸本)076951524X

A multidisciplinary, collaborative simulation has been performed on a Grid of geographically distributed PC clusters. The multiscale simulation approach seamlessly combines i) atomistic simulation based on the molecular dynamics (MD) method and ii) quantum mechanical (QM) calculation based on the density functional theory (DFT), so that accurate but less scalable computations are performed only where they are needed. The multiscale MD/QM simulation code has been Grid-enabled using i) a modular, additive hybridization scheme, ii) multiple QM clustering, and iii) computation/communication overlapping. The Gridified MD/QM simulation code has been used to study environmental effects of water molecules on fracture in silicon. A preliminary run of the code has achieved a parallel efficiency of 94% on 25 PCs distributed over 3 PC clusters in the US and Japan, and a larger test involving 154 processors on 5 distributed PC clusters is in progress. © 2002 IEEE.

关键词： Density functional theory

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Sink insertion for mesh improvement

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International Journal of Foundations of computer Science 2002年第2期13卷 223-242页

作者： Edelsbrunner, Herbert Guoy, Damrong Department of Computer Science Duke University Durham NC 27708 United States Raindrop Geomagic Research Triangle Park NC 27709 United States Center for Simulation of Advanced Rockets Computational Science and Engineering Program University of Illinois at Urbana-Champaign Urbana IL 61801 United States

We propose sink insertion as a new technique to improve the mesh quality of Delaunay triangulations. We compare it with the conventional circumcenter insertion technique under three scheduling regimes: incremental, in blocks, and in parallel. Justification for sink insertion is given in terms of mesh quality, numerical robustness, running time, and ease of parallelization. © 2002 World Scientific Publishing Company.

关键词： Delaunay triangulations dynamic data structures experimentation Mesh generation mesh quality parallel meshing

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A Web-ready HiMASS: facilitating collaborative, reusable, and distributed modeling and execution of simulation models with XML

A Web-ready HiMASS: facilitating collaborative, reusable, an...

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simulation Winter Conference

作者： T.S. Daum R.G. Sargent Hierarchical Modeling and Simulation Systems Himass Binghamton NY USA Department of Electrical Engineering and Computer Science Syracuse University Syracuse NY USA

We investigate the use of XML as an open, cross-platform, and extendable file format for the description of hierarchical simulation models, including their graphical representations, initial model conditions, and model execution algorithms. We present HiMASS-x, an XML-centered suite of software applications that allows for cross-platform, distributed modeling and execution of hierarchical, component-based, and reusable simulation models.

关键词： Collaboration Distributed control XML Java Graphical user interfaces Discrete event simulation Engines Markup languages Prototypes Flow graphs

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VRML clients linked through concurrent chat

VRML clients linked through concurrent chat

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simulation Winter Conference

作者： L.A. Belfore S. Battula Department of Electrical and Computer Engineering Virginia Modeling Analysis and Simulation Center Old Dominion University Norfolk VA USA Ynot Team Inc. VA USA

Internet based virtual reality offers the opportunity to render content in three dimensions. In addition, the Internet provides a medium to support collaborative activities. In this work, we describe how collaborative capabilities are integrated into the Interactive Land use VRML Application (ILUVA). ILUVA is a VRML based application that supports highly interactive functionality, live updates, and the dynamic generation of VRML content. The collaborative functions have been added in the context of an Internet chat session in which multiple users may participate from the Internet. In addition to the usual functions supported by chat applications, user information sharing is supported. The union or intersection of sessions from different users may be produced and reviewed in the world.

关键词： Internet Collaborative work Collaboration Geographic Information Systems Computational modeling Analytical models computer simulation Virtual reality Fabrics Business communication

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