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IEEE International Conference on Fuzzy systems (FUZZ-IEEE)

作者： Jee-Hyong Lee Hyung Lee-Kwang Department of Elecrical Engineering & Computer Science Division of Computer Science and Advanced Information Technology Research Center KAIST Taejon South Korea

ISBN: (纸本)0780358775

Ranking fuzzy numbers is one of the very important research topics in fuzzy set theory because it is a base of decision-making in all application areas. However, fuzzy numbers cannot be easily arranged in order of magnitude because they represent uncertain and vague values. When two fuzzy numbers overlap with each other, a fuzzy number may not be considered absolutely larger than the other. That is, even though a fuzzy number may be considered larger than the other, it may also be considered smaller than the other. It means that, even when we consider only two fuzzy numbers, two sequences may be the ranking result at the same time. However, most of the existing ranking methods produce only one ranking sequence. They ignore other possible sequences due to the overlap between fuzzy numbers. We propose a ranking method which generates possible ranking sequences of fuzzy numbers, and represents them with fuzzy sets. Some numeric examples are also presented to show how our method ranks fuzzy numbers.

关键词： Fuzzy sets State feedback Fuzzy set theory computer science Decision making Information technology Arithmetic Q measurement

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Amplitude dropout in coupled lasers

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Physical Review A 2000年第6期62卷 063815-063815页

作者： A. I. Khibnik Y. Braiman V. Protopopescu T. A. B. Kennedy K. Wiesenfeld United Technologies Research Center 411 Silver Lane MS 129-15 East Hartford Connecticut 06108 Center for Engineering Science Advanced Research Computer Science and Mathematics Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 School of Physics Georgia Institute of Technology Atlanta Georgia 30332

We study the entrainment of coupled solid-state lasers by an external injected field. We show that the total output intensity exhibits unexpected nonmonotonic behavior as a function of the injected field and find the critical amplitude marking the transition to the low-intensity branch. In addition, we also show that substantial partial entrainment can be achieved for injected fields much weaker than that required for full entrainment.

关键词： Solid state lasers

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Fusion method for physical systems based on physical laws

Fusion method for physical systems based on physical laws

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International Conference on Information Fusion

作者： N.S.V. Rao D.B. Reister J. Barhen Center for Eng. Sci. Adv. Res. Oak Ridge Nat. Lab. TN USA Center for Engineering Science Advanced Research Computer Science and Mathematics Division Oak Ridge National Laboratory Oak Ridge TN USA

Considers a physical system described by a set of parameters. Each parameter is either measured by a number of sensors or estimated by a set of computer programs that use sensor measurements. As a result, the resultant parameter values could be widely varying. We propose a fusion method that combines the measurements and estimators based on the physical laws that relate the parameters. In comparison with the traditional fusion problems, there is no training set that provides the actual parameter values. Furthermore, since every parameter is measured or estimated, there are no parameters whose actual values are known. We propose a fuser based on the least violation of the physical laws that relate the parameters. Under certain smoothness conditions on the physical law, we show the asymptotic convergence of our method, and also derive distribution-free performance bounds based on finite samples. We illustrate the effectiveness of this method for a practical problem of fusing well-log data in methane hydrate exploration. For this problem, the data fusion method resulted in an order-of-magnitude improvement in the accuracy compared to the best set of estimators for the key parameter of porosity.

关键词： Training data Sensor fusion computer errors Jacobian matrices computer science mathematics Laboratories Convergence Instruments Physics computing

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Higher-order dynamics in lattice-based models using the Chapman-Enskog method

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Physical Review E 2000年第2期61卷 2103-2103页

作者： Yue-Hong Qian Ye Zhou Department of Applied Physics and Applied Mathematics Columbia University New York New York 10027 IBM Research Division Thomas J. Watson Research Center P.O. Box 218 Yorktown Heights New York 10598 Institute for Computer Applications in Science and Engineering NASA Langley Research Center Hampton Virginia 23681

In this paper, we investigate the existence of higher-order dynamics in lattice-based models. We have identified two conditions that determine whether a model would allow some Burnett-like equations when the Chapman-Enskog expansion is used. These two conditions are the number of the conserved quantity as well as the space and time discretization. We shall demonstrate these conditions by discussing (1) pure diffusion equation and (2) hydrodynamic equations. While the fact that diffusion equation allows the higher-order dynamics can be shown easily, we will illustrate that care must be taken when deriving Burnett-like equations for lattice-based hydrodynamics models using the Chapman-Enskog method.

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Hierarchical test generation for systems on a chip

Hierarchical test generation for systems on a chip

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International Conference on VLSI Design

作者： R.S. Tupuri J.A. Abraham D.G. Saab Texas Microprocessor Division Advanced Micro Devices Inc. Austin TX USA Computer Engineering Research Center University of Technology Austin TX USA Department of Computer Engineering & Science Case Western Reserve University Cleveland OH USA

The rapid increase in functionality on a single chip in the last few years has increased the gap between the complexity of the design and the capability of commercial test tools. In particular the test needs for systems on a chip (SOC) are not addressed by existing tools. Because some of the cores integrated on a single SOC may not have embedded testability features, it is not always possible to use conventional design for testability (DFT) methodologies directly. This paper presents a novel approach for generating tests for complex SOCs which targets one module (or core) at a time, by extracting its environment elegantly in the form of constraints and storing it as virtual logic. Information about the core processor and internal bus is used to reduce the size of the virtual logic so that a commercial ATPG tool can be used to generate tests. These tests are then automatically translated to system-level tests. The approach is illustrated with an example SOC based on the picoJava core.

关键词： System testing System-on-a-chip Automatic testing Hip Design for testability Integrated circuit testing Microprocessors Jacobian matrices Automatic test pattern generation Moore's Law

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Automating component integration for web-based data analysis

Automating component integration for web-based data analysis

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IEEE Conference on Aerospace

作者： J. Penix B. Fischer J. Whittle G. Pour J. Van Baalen Computational Sciences Division NASA Ames Research Center Moffett Field CA USA NASA Ames Research Center Moffett Field CA US Computational Sciences Division Recom Technologies Corporation Moffett Field CA USA Department of Computer Information and Systems Engineering San Jose State University Foundation San Jose CA USA Computer Science Department University of Wurzburg Laramie WY USA

In this paper, we describe a component-based infrastructure for Web-based data analysis applications that reduces the need for custom integration programming; Our vision is that, to construct an application, scientists will give a specification of three kinds of components: the desired data source, a data analysis filter, and a visualization device. From this specification, our infrastructure will automatically generate the desired application. To support this vision, the infrastructure contains an intelligent component integration system (iCIS) that automates component retrieval, adaptation, and integration. Within iCIS, component knowledge is represented using formal mathematical specifications, to provide a common framework for reasoning about problem decomposition, component retrieval and adapter generation. Our current focus is on integration of data analysis filters with online data archives described using XML-based languages. We also discuss how iCIS is integrated with a 3-tier client/server application architecture to support in a heterogeneous and distributed computing environment.

关键词： Data analysis Application software Data visualization Filters NASA Intelligent systems computer architecture Software engineering Maintenance Space technology

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Higher-order dynamics in lattice-based models using the Chapman-Enskog method

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Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 2000年第2期61卷 2103-2106页

作者： Qian, Yue-Hong Zhou, Ye Department of Applied Physics and Applied Mathematics Columbia University New YorkNY10027 United States IBM Research Division Thomas J. Watson Research Center P.O. Box 218 Yorktown HeightsNY10598 United States Institute for Computer Applications in Science and Engineering NASA Langley Research Center HamptonVA23681 United States Exa Corp 450 Bedford Street LexingtonMA02420 United States

关键词： Hydrodynamics

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Strategic directions in verification, validation, and accreditation research

Strategic directions in verification, validation, and accred...

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Simulation Winter Conference

作者： R.G. Sargent P.A. Glasow J.P.C. Kleijnen A.M. Law I. McGregor S. Youngblood Advanced Information Technology Center MITRE Corporation McLean VA USA Department of Information Systems Center for Economic Research School of Economics and Business Administration Tilburg University KUB Tilburg Netherlands Averill M. Law and Associates Inc. Tucson AZ USA AutoSimulations Inc. Bountiful UT USA DMSO Alexandria VA USA Simulation Research Group Department of Electrical Engineering and Computer Science Syracuse University Syracuse NY USA

The authors, six simulation professionals, present their views on the directions that they believe that verification, validation, and accreditation research should take. Two of the six are active verification, validation, and accreditation researchers from academia, two develop industry simulation models, and two work in verification, validation, and accreditation of military simulation models. A number of areas and topics for research in verification, validation, and accreditation are identified. It appears that application domains of simulation models affect what topics need verification, validation, and accreditation research.

关键词： Accreditation Testing Defense industry Computational modeling computer simulation computer science Lifting equipment Information systems Medical simulation Logic

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Navy's CFC & Halon elimination program

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NAVAL ENGINEERS JOURNAL 2000年第1期112卷 91-112页

作者： Toms, GS Breslin, DA Brunner, GP Thill, JC Gregory S. Toms RE:is the CFC & Halon Elimination Program Manager for the Naval Sea Systems Command (NAVSEA). He received a master of science degree in mechanical engineering from the University of Maryland and a B.S. degree in mechanical engineering from West Virginia University. From 1984 to 1997 he was employed at the Naval Surface Warfare Center Carderock Division Annapolis Detachment (formerly David Taylor Research Center) where he worked on the development of advanced centrifugal compressor air conditioning plants for shipboard applications. He received the Stratospheric Ozone Protection Award in 1998 from the U.S. Environmental Protection Agency in recognition of his exceptional leadership and technical achievements in eliminating ozone-depleting substances from Navy ships. He is licensed as a registered Professional Engineer in the state of Texas. David A. Breslin P.E.:is the Director of Technical Operations for the Naval Surface Warfare Center and is the Chairperson of the ASNE Committee on Environmental Engineering. He received a master of science in aerospace engineering from Virginia Tech in 1991 a master of engineering administration in industrial & systems engineering from Virginia Tech in 1991 and a bachelor of engineering in mechanical engineering from Stevens Institute of Technology in 1985. From 1993 to 1997 he was the program manager of the Naval Sea Systems Command's CFC & Halon Elimination Program. Because of his many efforts he received a Stratospheric Ozone Protection Award in 1995 from the U.S. Environmental Protection Agency in recognition of “exceptional contributions to global environmental protection”. Gregory P. Brunner:was employed by the Carderock Division of the Naval Surface Warfare Center and Naval Sea Systems Command (NAVSEA) from 1983 until 1997. From 1993 to 1997 he served as the R&D program manager for the NAVSEA CFC & Halon Elimination Program Office. Program efforts resulted in the development of new refrigerants for backfit into existing shipboard air-conditioning

The domestic production of the most powerful Ozone-Depleting Substances (ODSs) has permanently ceased and the abundant supplies of a number of inexpensive refrigerants, fire-fighting agents, and solvents, once taken for granted, are now a thing of the past. The Navy's original strategy of conserving ODSs, converting systems and processes where feasible, relying on strategic reserves where necessary, and developing "ozone-friendly" equip ment for new-design surface ships and submarines is succeeding. The purpose of this paper is to document the Navy's efforts to date relative to combating the threat to uninterrupted Fleet operations posed by the cessation of ODS production. Specifically, this paper addresses the Navy's shipboard conversion programs for air-conditioning and refrigeration (AC&R) systems, the development of next-generation AC&R systems, the selection of halon substitutes for new-construction fire-fighting systems, and the Navy's alternative to CFC-113 in the cleaning of critical oxygen systems.

关键词： Naval architecture

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Friction Selection in Nonlinear Particle Arrays

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Physical Review Letters 1999年第1期83卷 104-104页

作者： H. G. E. Hentschel F. Family Y. Braiman Department of Physics Emory University Atlanta Georgia 30322 Center for Engineering Science Advanced Research Computer Science and Mathematics Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831

When a discrete nonlinear array is driven across a periodic surface spatially coherent modes of motion can coexist associated with different average velocities due to resonant parametric forcing of the particle fluctuations by the center of mass motion. Depending on the coupling strength κ and size of the array N, jumps in the minimum friction (maximum velocity) exhibited by the array occur at κm(N)∼(N/m)2 as new modes stabilize and are selected by the dynamics. The existence of such coherent modes allows both an effective low dimensional description of the dynamics to exist and the possibility for control of friction close to these instabilities.

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