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Annual Conference of AI, simulation, and Planning in High Autonomy Syslems

作者： B.P. Zeigler C.-J. Luh T.-G. Kim Al-Simulation Research Group Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA Department of Electrical & Computer Engineering University of Kansas Lawrence KS USA

ISBN: (纸本)0818620439

The management of model bases using system entity structure concepts is addressed. Building on the basis of the system entity structure/model base framework as implemented in the DEVS-Scheme, the authors have extended the ability of their knowledge/model base tools to support multifaceted systems design through the ability to generate a family of design alternatives, reusability of models, and model base coherence and evolvability. It is shown 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. Such an approach has been demonstrated in the design of a robot-managed space-borne laboratory simulation environment.< >

关键词： Instruments Orbital robotics Cognitive robotics Robot sensing systems Robot kinematics Laboratories Context modeling Tracking Image generation Robot vision systems

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Nonlinear circuit optimization with dynamically integrated physical and device models

Nonlinear circuit optimization with dynamically integrated p...

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Microwave, MTT-S International Symposium

作者： J.W. Bandler Q.J. Zhang Q. Cai Simulation Optimization Systems Research Laboratory and Department of Electrical and Computer Engineering McMaster University Hamilton ONT Canada

The approach used, which is directed at the next-generation tools for yield optimization, dynamically integrates physics-based device models. The FET model of M.A. Khatibzadeh and R.J. Trew (IEEE Trans. Microwave Theory Tech., vol.36, p.231-8, 1988) is treated in a novel formulation of harmonic balance simulation. Adjoint sensitivity analysis allows efficient optimization of parameters such as device dimensions, material-related parameters, doping profile, channel thickness, etc. Parameter extraction extraction and power amplifier design are demonstrated.< >

关键词： Nonlinear circuits Semiconductor process modeling Integrated circuit yield Microwave FETs Microwave devices Microwave theory and techniques Circuit simulation Sensitivity analysis Doping profiles Parameter extraction

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A least-squares pole-zero algorithm in the frequency and Walsh domains with applications to speech representation

A least-squares pole-zero algorithm in the frequency and Wal...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： W.B. Mikhael A.S. Spanias Department of Electrical Engineering Institute of Simulation and Training University of Central Florida Orlando FL USA Department of Electrical & Computer Engr. Arizona State University Tempe AZ USA

A spectral envelope matching technique is presented to allow coding of the mixed DFT-WHT parameters at lower rates. A least-squares (LS) pole-zero algorithm is derived in the frequency-domain. Pole-zero, as well as all-zero and all-pole, solutions can be obtained using the LS algorithm. The all-pole model is employed in this research to fit finite subsets of DFT components and WHT spectral components. The all-pole function, while characterized by real coefficients, carries location, magnitude, and phase information for accurate signal synthesis. simulation results, using speech signals, are presented to demonstrate the performance of the algorithm.< >

关键词： Speech Frequency Narrowband Discrete Fourier transforms computer errors Fourier transforms Signal representations Wideband Least squares methods Signal synthesis

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Practical high speed gradient computation for harmonic balance simulators

Practical high speed gradient computation for harmonic balan...

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Microwave, MTT-S International Symposium

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

The authors introduce a powerful computational concept called the future adjoint sensitivity technique (FAST). FAST is an expedient tool for gradient calculation in the harmonic balance environment. FAST combines the efficiency of the exact adjoint sensitivity technique with the simplicity of the conventional perturbation technique. The same concept carries over to a practically implementable Jacobian for fast harmonic balance simulation. FAST promises high-speed gradient evaluation essential for yield optimization of nonlinear monolithic microwave integrated circuits by general purpose of software. The features of FAST and its Jacobian extensions are illustrated by a mixer example and a frequency-doubler example.< >

关键词： Computational modeling Jacobian matrices Circuit simulation Voltage Nonlinear circuits Nonlinear equations Perturbation methods Vectors MMICs Microwave theory and techniques

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Efficient large-signal FET parameter extraction using harmonics

Efficient large-signal FET parameter extraction using harmon...

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Microwave, MTT-S International Symposium

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

The authors present a novel approach to large-signal nonlinear parameter extraction of GaAs metal-semiconductor field-effect transistor (MESFET) devices measured under harmonic conditions. Powerful nonlinear adjoint-based optimization simultaneously processes multibias, multi-power-input, multi-fundamental-frequency excitations and multiharmonic measurements to reveal the parameters of the intrinsic FET. One test successfully processed 111 error functions of 20 model parameters. The technique was implemented in a program called HarPE (harmonic balance driven model parameter extractor).< >

关键词： Parameter extraction Microwave FETs Power measurement Power system harmonics Computational modeling Data mining Circuits Voltage Gallium arsenide MESFETs

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Yield optimization of nonlinear circuits with statistically characterized devices

Yield optimization of nonlinear circuits with statistically ...

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Microwave, MTT-S International Symposium

作者： J.W. Bandler Q.J. Zhang J. Song R.M. Biernacki Simulation Optimization Systems Research Laboratory and the Department of Electrical and Computer Engineering McMaster University Hamilton ONT Canada Optimization Systems Associates Inc. Dundas ONT Canada

A comprehensive treatment of yield optimization of nonlinear microwave circuits with statistically characterized devices is proposed. The authors fully exploit advanced techniques of a one-sided l/sub 1/ circuit centering with gradient approximations and efficient harmonic balance simulation with exact Jacobians. Multidimensional statistical distributions of the intrinsic and parasitic parameters of field-effect transistors are fully handled. Yield is driven from 25% to 61% for a frequency doubler design having 34 statistically toleranced parameters. The yield of a small-signal amplifier is increased from 36% to 68%.< >

关键词： Nonlinear circuits Circuit simulation Microwave devices Microwave circuits Design optimization Jacobian matrices Integrated circuit yield Robustness Microwave FETs Computational modeling

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Combined Discrete/Normal Statistical Modeling of Microwave Devices

Combined Discrete/Normal Statistical Modeling of Microwave D...

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European Conference on Microwave

作者： J.W. Bandler R.M. Biernack S.H. Chen J.F. Loman M.L. Renault Q.J. Zhang Simulation Optimization Systems Research Laboratory Department of Electrical and Computer Engineering McMaster University Hamilton Canada Optimization Systems Associates Inc. P.O. Box 8083 Dundas Ontario Canada L9H 5E7 Simulation Optimization Systems Research Laboratory Department of Electrical and Computer Engineering McMaster University Hamilton Canada L8S 4L7. Optimization Systems Associates Inc. Dundas ONT Canada

This paper deals with statistical characterization of the equivalent circuit parameters for microwave FET devices. The statistics are derived from the S-parameters measured for a sample of devices. The use of a multidimensional normal distribution seems justified for most parameters. For parameters exhibiting sample distributions substantially different from normal we propose a combined discrete/normal approach that can preserve the means, standard deviations, correlations and marginal distributions derived from the sample. This provides enhanced accuracy of the model while retaining the simplicity of the normal distribution. The problem of the size of the sample is also addressed in terms of confidence levels and confidence intervals.

关键词： Microwave devices Equivalent circuits Gaussian distribution Scattering parameters Multidimensional systems Parameter extraction Histograms Microwave FETs Circuit simulation Statistical distributions

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THE QUANTIFICATION OF INTEROPERABILITY

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NAVAL ENGINEERS JOURNAL 1989年第3期101卷 251-256页

作者： MENSH, DR KITE, RS DARBY, PH Dennis Roy Mensh:is currently the task leader Interoperability Project with the MITRE Corporation in McLean Va. He received his B.S. and M.S. degrees in applied physics from Loyola College in Baltimore Md. and the American University in Washington D. C. He also has completed his course work towards his Ph.D. degree in computer science specializing in the fields of systems analysis and computer simulation. He has been employed by the Naval Surface Warfare Center White Oak Laboratory Silver Spring Md. for 20 years in the areas of weapon system analysis and the development of weapon systems simulations. Since 1978 he has been involved in the development of tools and methodologies that can be applied to the solution of shipboard combat system/battle force system architecture and engineering problems. Mr. Mensh is a member of ASNE MORS IEEE U.S. Naval Institute MAA and the Sigma Xi Research Society. Robert S. Kite:is a systems engineer with the Naval Warfare Systems Engineering Department of the MITRE Corporation in McLean Va. Mr. Kite received his B.S. degree in electronic engineering from The Johns Hopkins University in Baltimore Md. Mr. Kite retired from the Federal Communications Commission in 1979 and served a project manager of the J-12 Frequency Management Support Project for the Illinois Institute of Technology Research Institute in Annapolis Md. before joining MITRE. Mr. Kite is presently a member of ASNE the Military Operations Research Society and an associate member of Sigma Xi. Paul H. Darby:has worked in the field of interoperability both in the development of interoperability concepts and systems since joining the Department of the Navy in 1967. He was the Navy's program manager for the WestPacNorth TACS/ TADS and IFFN systems. He is currently head of the Interoperability Branch Warfare Systems Engineering Office Space and Naval Warfare Systems Command. He holds a B.S. from the U.S. Naval Academy.

JCS Pub 1 defines interoperability as “The ability of systems, units or forces to provide services to and accept services from other systems, units or forces and to use the services so exchanged to enable them to operate effectively together.” With JCS Pub 1 as a foundation, interoperability of systems, units or forces can be factored into a set of components that can quantify interoperability. These components are: media, languages, standards, requirements, environment, procedures, and human factors. The concept described in this paper uses these components as an analysis tool to enable specific detailed analyses of the interoperability of BFC3 systems, units, or forces for the purpose of uncovering and resolving interoperability issues and problems in the U.S. Navy, Joint, and Allied arenas. Also, as a management tool, the components can help determine potential interoperability characteristics of future U.S. Navy BFC3 systems for compliance with battle force systems architectures. The approach selected for the quantification of interoperability was the development of a set of measures of performance (MOPs) and measures of effectiveness (MOEs). The MOPs/MOEs were integrated with a candidate set of components, which were used to partition the totality of interoperability into measurable entities. The methodology described employs basic truth table theory in conjunction with logic equations to evaluate the interoperability components in terms of MOPs that were aggregated to MOEs. It is believed that this concept, although elementary and based on fundamental principles, represents an operationally significant approach rather than a theoretical approach to the quantification of interoperability. The vehicle used as a means to measure the MOPs and MOEs was the Research Evaluation and Systems Analysis (RESA) computer modeling and simulation capability at the Naval Ocean Systems Center (NOSC), San Diego, Calif. Data for the measurements were collected during a Tactical I

关键词： Military engineering

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THE AEGIS DATA BUS EXPERIMENT

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NAVAL ENGINEERS JOURNAL 1989年第5期101卷 53-58页

作者： FRINK, JG VERVEN, DM John G. Frink is an assistant group supervisor in the Fleet Systems Department of The Johns Hopkins University Applied Physics Laboratory. He received his B.S. degree in physics from Michigan State University in 1968 and the M.S. degree in computer science from the University of Maryland in 1971. Mr. Frink worked at the Naval Surface Weapons Center White Oak Laboratory on a variety of weapons systems before joining the Applied Physics Laboratory in 1978. Mr. Frink has supervised the development of a large scale battle group simulation that successfully employs the receiver selection paradigm described herein on a hardware suite composed of an extensible number of (currently 15) processors. David M. Verven is a senior electrical engineer in the Fleet Systems Department of The Johns Hopkins University Applied Physics Laboratory. He received the B.S. degree in electrical engineering from the University of Maryland College Park in 1979 and the M. S. degree in the same discipline from The Johns Hopkins University in 1984. Mr. Verven joined the Applied Physics Laboratory in 1979 and initially worked on analysis of Navy sensor systems. In 1981 he was the AN/SPS-49 test team leader for the New Threat Upgrade (NTU) combat system land-based test. In 1982 he became involved in the development of the BBWRS system. Currently he is involved in real-time computer program development for the CEP project.

This paper documents an experiment performed by The Johns Hopkins University Applied Physics Laboratory to measure the effect of inserting a data bus into a combat system. The experiment was conducted at the Aegis computer Center located at the Naval Surface Weapons Center in Dahlgren, Virginia (NSWC/DL). The purpose of the experiment was to determine whether or not the Aegis Weapon System (the core of the Aegis Combat System) could be operated with a portion of its point-to-point interelement cables replaced by a data bus. The data bus chosen for the experiment employs message broadcasting with receiver selection. A primary goal of the experiment was to minimize the amount of Aegis computer program changes required to accommodate the data bus. The results presented in this paper will show that the experiment was a success. Key certification tests were passed with no computer program changes to the tactical elements and minimal changes in the Aegis tactical executive (ATES) program (less than 110 words changed).

关键词： Data Transmission Equipment

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ESTIMATION OF STRUCTURAL SERVICE LIFE OF SHIPS

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NAVAL ENGINEERS JOURNAL 1989年第3期101卷 156-166页

作者： AYYUB, BM WHITE, GJ PURCELL, ES P.E. Bilal M. Ayyub:is currently an associate professor of civil engineering at the University of Maryland. He received his B.S. degree in civil engineering from the University of Kuwait in 1980. He completed both his M.S. (1981) and Ph.D. (1983) in civil engineering at the Georgia Institute of Technology. Dr. Ayyub has an extensive background in risk-based analysis and design simulation and construction engineering. He is engaged in research work involving structural reliability bridges marine structures and mathematical modeling using the theories of probability statistics and fuzzy sets. His research work is sponsored by the National Transportation Safety Board the National Science Foundation the U.S. Coast Guard the State of Maryland and the University of Maryland. Dr. Ayyub is a member of ASNE the American Society of Civil Engineers (ASCE) the American Concrete Institute (ACI) the Committee on Forensic Engineering of ASCE and the Committee on Structural Safety of ACI. He is the author of more than three dozen publications in national and international journals conference proceedings and reports. Dr. Ayyub received the ASNE “Jimmie” Hamilton Award for 1985 and the ASCE “Outstanding Research Oriented Paper” in the Journal of Water Resources Planning and Management for 1987. Gregory J. White:is an associate professor of naval architecture at the U.S. Naval Academy. He received his B.S. degree in engineering mechanics from Vanderbilt University in 1975 an M.E. degree in naval architecture from the University of California Berkeley in 1981 and a Ph.D. in civil engineering (structures) from the University of Maryland in 1986. Dr. White served on active duty with the U.S. Navy from 1975 to 1979 as a junior officer in the engineering and operations departments of Pacific Fleet destroyers. Prior to coming to the Naval Academy he worked at Mare Island Naval Shipyard in the scientific code and in the R&D division of Exxon International Company's Tanker Department. Dr. White is a lieutenant commande

A methodology for the structural life assessment of a ship's structure is suggested. The methodology is based on probabilistic analysis using reliability concepts and the statistics of extremes. In this approach, the estimation of structural life expectancy is based on selected failure modes. All possible failure modes of the ship must be investigated and the most likely paths to structural failure identified. For the purpose of illustration two failure modes are considered in this study. They are plate plastic deformation and fatigue cracking. Structural life based on these two failure modes is determined for an example vessel. The methodology determines the probability of failure of the ship's structural components according to the identified failure modes as a function of time. The results can be interpreted as the cumulative probability distribution function (CDF) of structural life. Due to the unknown level of statistical correlation between failure modes, limits or bounds on the CDF of the structural life are established. The limits correspond to the extreme cases of fully correlated and independent failure modes. The CDFs of structural life are determined for two inspection strategies; namely, inspection every year and inspection every two years with a warranty inspection at the end of the first year. The meaning of the results for the case investigated in this study is that, for example, given an inspection strategy of two years and a desired life of 15 years, there is a 72% chance that the vessel will not experience enough partial damage‘ in the failure modes identified to constitute reaching the “end of structural life” as defined.

关键词： Ships

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