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Microwave, MTT-S International Symposium

作者： J.W. Bandler S. Ye Q. Cai R.M. Biernacki S.H. Chen Simulation Optimization Systems Research Laboratory Department of Electrical and Computer Engineering McMaster University Hamilton Canada Optimization Systems Associates Inc. Dundas ONT Canada

The authors present a comprehensive approach to predictable yield optimization. They utilize a new physics-based statistical GaAs MESFET model which combines the advantages of the DC Khatibzadeh and Trew model and the small-signal Ladbrooke formulas. The yield of a broadband amplifier was significantly improved after optimization. Predicted yield over a range of specifications was verified by device data. The benefits of simultaneous circuit-device yield optimization assisted by yield sensitivity analysis are demonstrated.< >

关键词： Circuit optimization Semiconductor process modeling MESFETs Gallium arsenide Statistics Broadband amplifiers Sensitivity analysis Design optimization Optimized production technology Doping

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NONLINEAR TRANSIENT ANALYSIS OF COUPLED RLGC LINES BY THE METHOD OF CHARACTERISTICS

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INTERNATIONAL JOURNAL OF MICROWAVE AND MILLIMETER-WAVE computer-AIDED engineering 1992年第2期2卷 108-115页

作者： ORHANOVIC, N TRIPATHI, VK Department of Electrical and Computer Engineering Oregon State University Corvallis Oregon 97331 Neven Orhanovic was born in Osijek Croatia on July 131964. He received the Dipl. Ing. degree in electrical engineering from the University of Zagreb Croatia where he studied from 1983 to 1988. He received the M.S. degree in electrical engineering from Oregon State University Corvallis in 1990. Presently he is a Research Assistant at Oregon State University in the Department of Electrical and Computer Engineering where he is working towards a PhD degree. His areas of interest include electromagnetic simulation of microwave components and circuits. Vijai K. Tripathi received the BSc degree from Agra University Uttar Pradesh India in 1958 the MSc Tech degree in electronics and radio engineering from Allahabad University Uttar Pradesh. India in 1961 and the MSEE and PhD degrees in electrical engineering from the University of Michigan Ann Arbor in 1964 and 1968 respectively. From 1961 to 1963 he was a Senior Research Assistant at the Indian Institute of Technology Bombay India. In 1963 he joined the Electron Physics Laboratory of the University of Michigan where he worked as a Research Assistant from 1963 to 1965 and as a Research Assistant from 1966 to 1967 on microwave tubes and microwave solid-state devices. From 1968 to 1973 he was an assistant Professor of Electrical engineering at the University of Oklahoma. Norman. In 1974 he joined Oregon State University Corvallis where he is a Professor of Electrical and Computer Engineering. His visiting and sabbatical appointments have included the Division of Network Theory at Chalmers University of Technology in Gothenburg Sweden from November 1981 through May 1982: Duisburg University Duisburg Germany from June through September 1982 and the Electronics Technology Division of the Naval Research Laboratory in Washington. D.C. in the summer of 1984. His current research activities are in the areas of microwave circuits and devices electro

A computationally efficient numerical technique for the evaluation of the time domain response of coupled lossy uniform and nonuniform transmission lines terminated in general nonlinear elements is presented. The technique is based on the method of characteristics where the original system of coupled transmission line equations is transformed into a system of ordinary differential equations which hold along a family of characteristic curves. An algorithm to solve these equations is presented. The procedure is applicable to both uniform and nonuniform coupled systems and examples of two and three line structures terminated in linear and nonlinear elements are included to demonstrate the versatility and the usefulness of the algorithm.

关键词： Mathematical Techniques

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computer aids for chemical engineering education. An assessment of CACHE-1971-1992

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computer Applications in engineering Education 1992年第1期1卷 3-3页

作者： Seider, W.D. Chemical Engineering Department University of Pennsylvania Philadelphia Pennsylvania 19104–6393 Warren Seider:is Professor of Chemical Engineering at the University of Pennsylvania. His research is in the area of process design with an emphasis on operability and controllability. In coursework he uses the computer actively to teach design synthesis process control and separation processes. Warren is a coauthor ofIntroduction to Chemical Engineering and Computer CalculationsandFLOWTRAN Simulation—An Introduction. He has served as the first President of the CACHE Committee and chair of its Curriculum Task Force. He received his BS degree from the Polytechnic Institute of Brooklyn and his PhD from the University of Michigan.

Since its inception in 1971, the computer Aids for Chemical engineering Education (CACHE) Corporation has concentrated on promoting cooperation among universities, industry, and government in the development and distribution of computer-related and/or technology-based educational aids for the chemical engineering profession. This article assesses the success of several projects designed to provide aids for individual courses, as well as for a broader segment of the curriculum. The projects include: (1) the provision of 125 computer assignments for the core courses; (2) the preparation of teaching materials for, and the distribution of, Monsanto's FLOWTRAN program for use in the design courses; (3) the preparation of PC modules for many courses, leading to the Michigan project on the Development of Innovative Engineers, the Washington project on Graphical computer Aids for fluid flow and reaction in the design of chemical reactors, and the Purdue project on Laboratory Modules; and (4) the development of the MICROCACHE courseware delivery system. Also considered are the CACHE recommendations concerning the minimum requirements for computing in the undergraduate curriculum, presented to the AIChE Education and Accreditation Committee. The CACHE Corporation has facilitated several research conferences, the impact of which is assessed.

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OBJECT-ORIENTED MODELING AND DISCRETE-EVENT simulation

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ADVANCES IN computerS 1991年第C期33卷 67-114页

作者： ZEIGLER, BP Al-Simulation Research Group Department of Electrical and Computer Engineering University of Arizona Tucson Arizona

The chapter focuses on the discrete-event modeling and simulation approach that emerged from operations-research concerns. Object-oriented modeling and discrete-event simulation provide a powerful basis for design and analysis of computer-based systems in such applications as flexible manufacturing, automation, and robotics. The object-oriented approach provides powerful modeling concepts to support computer-based tools for complex system design. Discrete-event simulation has a long history of association with the object-oriented paradigm and provides the critical ability to study the dynamic behavior of models that are defined with object-oriented means. It is characteristic of simulation tools that they facilitate a (hypothetical) description of the internal structure of a real system to the level of detail that the modeler perceives in reality. This power of representation distinguishes simulation from analytical techniques but also places a new burden on the modeler such as the choice of the level of detail compatible with the objectives of the modeling effort, the real-system data available, and the computational and human resources at one's disposal. Modeling and simulation are usually performed within the context of system design, control, or management. The chapter also describes the discrete event system specification (DEVS) theory of discrete-event systems, emphasizing that DEVS should provide a firm foundation for such next-generation software environments.

关键词： computer Programming

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PARTICLE-IN-CELL CHARGED-PARTICLE simulationS, PLUS MONTE-CARLO COLLISIONS WITH NEUTRAL ATOMS, PIC-MCC

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IEEE TRANSACTIONS ON PLASMA SCIENCE 1991年第2期19卷 65-85页

作者： BIRDSALL, CK Plasma Theory and Simulation Group Department of Electrical Engineering and Computer Sciences University of California Berkeley Berkeley CA USA

Many-particle (meaning 1000's) charged-particle plasma simulations using spatial meshes for the electromagnetic field solutions, particle-in-cell (PIC) merged with Monte Carlo collision (MCC) calculations, are coming into wide use for application to partially ionized gases. This paper emphasizes the development of PIC computer experiments since the 1950's starting with one-dimensional (1-D) charged-sheet models, the addition of the mesh, and fast direct Poisson equation solvers for 2-D and 3-D. The finite-size particle-in-mesh (finite DELTA-x, DELTA-t) theory of Langdon [51]-[53] is presented in part to display the effects of too small lambda-D/DELTA-x, even for Maxwellian velocity distributions, as a caution, for example, when some ions are cooled to background gas temperatures by charge exchange. Early work on adding collisions to 1-D charge-sheet models by Burger [28] and Shanny et al. [76] are presented, with many of the elements of current Monte Carlo codes. Bounded plasma modeling is presented with electrode charges and external R, L, C, and V(t), I(t) sources now in use on fast desktop computers as real-time computer experiments, complementing analytic modeling and laboratory experiments. The addition of Monte Carlo collisions (usually done with irregular timesteps) to PIC (usually done with uniform DELTA-t's) is displayed as a developing art, relying on experimental total cross sections and approximate analytical differential cross sections to produce changes in charged-particle speed and direction due to collisions with neutrals, so far including elastic, excitation, ionization, charge exchange, and attachment processes.

关键词： Cells Hypoderma Neutral atoms Plasmas simulating Ions Collisions

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Symbolic discrete event system specification 2

Symbolic discrete event system specification

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2nd Annual Conference on AI, simulation and Planning in High Autonomy Systems: Integrating Qualitative and Quantitative System Knowledge, AIHAS 1991

作者： Zeigler, B.P. Chi, Sungdo AI-Simulation Group Department of Electrical and Computer Engineering University of Arizona TucsonAZ85721 United States

ISBN: (纸本)0818621621

Extending discrete event modelling formalisms to facilitate greater symbol manipulation capabilities is important to further their use in intelligent control and design of high autonomy systems. This paper defines an extension to the discrete event system specification (DEVS) formalism that facilitates symbolic expression of event times by extending the time base from the real numbers to the field of linear polynomials over the reals. A simulation algorithm is developed to generate the branching trajectories resulting from the underlying nondeterminism. The extended formalism offers a convenient means to conduct multiple, simultaneous explorations of model behaviors. Examples of application are given with concentration on fault model analysis. © 1991 IEEE.

关键词： Specifications

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Abstraction morphisms for task planning and execution 2

Abstraction morphisms for task planning and execution

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2nd Annual Conference on AI, simulation and Planning in High Autonomy Systems: Integrating Qualitative and Quantitative System Knowledge, AIHAS 1991

作者： Luh, C.-J. Zeigler, B.P. Al-Simulation Research Group Department of Electrical and Computer Engineering University of Arizona TucsonAZ85721 United States

ISBN: (纸本)0818621621

Deals with further efforts to develop abstraction mechanisms for systematic derivation of related models through the use of system morphisms. The authors describe an abstraction mechanism for mapping a task plan hierarchy into an isomorphic tree of model abstractions that supports hierarchical task execution. The task plan hierarchy is formulated in a model-based planning approach. They also show how the hierarchical execution structure can be constructed. Then the endomorphism concept employed in the modelling of autonomous systems is illustrated. The DEVS-Scheme knowledge-based, discrete event simulation environment is used to test the models and tools in an autonomous laboratory application. © 1991 IEEE.

关键词： Discrete event simulation

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Model Base Management for Multifacetted Systems

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ACM Transactions on Modeling and computer simulation (TOMACS) 1991年第3期1卷 195-218页

作者： Zeigler, Bernard P. Luh, Cheng-Jye Kim, Tag-Gon AI Simulation Group Department of Electrical and Computer Engineering University of Arizona Tuscon AZ 85721 United States Department of Electrical Engineering Korea Advanced Institute of Science and Technology Taejon South Korea

This article describes further efforts to employ the Systems Entity Structure/Model Base framework as a workable foundation for model base management in advanced simulation environments and workbenches. Such management facilities aim to provide a sharable repository of models and a means of assisting users to synthesize models to satisfy the objectives of the current study. In our approach, we view a multifaceted system as needing many models on which to base control, management, design and other interventions. These models differ in level of abstraction and in formalism. Concepts and tools are needed to organize the models into a coherent whole. This paper deals with the management of model bases using system entity structure concepts. We show how the pruning process supports reuse of previously pruned structures. Concepts of context-sensitive pruning and partitioned entity structure bases are introduced to promote model base coherence and evolvability. © 1991, ACM. All rights reserved.

关键词： evolvability model base coherence model base management reusability

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Abstraction morphisms for world modelling in high autonomy systems 91

Abstraction morphisms for world modelling in high autonomy s...

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Proceedings of the 23rd conference on Winter simulation

作者： Cheng-Jye Luh Bernard P. Zeigler AI-Simulation Research Group Department of Electrical and Computer Engineering The University of Arizona Tucson AZ

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Abstraction morphisms for world modelling in high autonomy systems

Abstraction morphisms for world modelling in high autonomy s...

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simulation Winter Conference

作者： C.-J. Luh B.P. Zeigler AI-Simulation Research Group Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA

A model-based autonomous system uses a multiplicity of models at various control layers to support the predefined system objectives. These models differ in level of abstraction and in formalism. It is noted that concepts and tools are needed to organize the models into a coherent whole. The authors have developed abstraction mechanisms for mapping models of laboratory instruments into operational abstractions, and for mapping a task plan hierarchy into an isomorphic tree of model abstractions. In the present work, they discuss further efforts to develop abstraction mechanisms for systematic derivation of related models through the use of system morphisms. They describe an abstraction mechanism for abstracting spatial relations between the model of the external world and the internal world model used in an autonomous agent. They also show how such a mechanism supports world modeling coherence. Then they illustrate the integration of the world modeling approach and abstraction mechanisms in an autonomous multi-agent laboratory application.< >

关键词： Laboratories Intelligent control Autonomous agents Artificial intelligence Problem-solving Automation

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