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Annual IEEE symposium on Computer-Based Medical Systems

作者： S.E. Hauser D. Demner-Fushman G. Ford G.R. Thoma Department of Health and Human Services Communications Engineering Branch Lister Hill National Center for Biomedical Communications National Library of Medicine National Institutes of Health Bethesda MD USA

PubMed on Tap is a testbed system that supports search of and retrieval from the National Library of Medicine's MEDLINE/spl reg/ database from a PDA. The goal of the PubMed on Tap project is to discover and implement design principles for point-of-care delivery of clinical support information. The project explores user interface issues, information content and organization, and system performance. Here we present our progress in these areas.

关键词： System testing Databases User interfaces Libraries Personal digital assistants Medical services Mobile communication Biomedical communication Research and development Wireless networks

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A multi-level approach to the dependability analysis of networked systems based on the CAN protocol

A multi-level approach to the dependability analysis of netw...

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symposium on Integrated Circuits and Systems design (SBCCI)

作者： F. Corno J.P. Acle M.S. Reorda M. Violante Dipartimento Automatica e Inforrnatica Politecnico di Torino Torino Italy Facultad de Ingeniería lnstituto de Ingenieria Eléctrica Universidad de la Republica Montevideo Uruguay

Safety-critical applications are now common where both digital and mechanical components are deployed, as in the automotive fields. The analysis of the dependability of such systems is a particularly complex task that mandates modeling capabilities in both the discrete and in the continuous domains. To tackle this problem a multi-level approach is presented here, which is based on abstract functional models to capture the behavior of the whole system, and on detailed structural models to cope with the details of system components. In this paper, we describe how the interaction between the two levels of abstraction is managed to provide accurate analysis of the dependability of the whole system. In particular, the proposed technique is shown to be able to identify faults affecting the CAN network whose effects are most likely to be critical for vehicle's dynamic. Exploiting the information about the effects of these faults, they can then be further analyzed at the higher level of details.

关键词： Protocols Automotive engineering Computer network reliability Computer networks Vehicle dynamics Application software Permission Fault diagnosis Information analysis Testing

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Infant behavior simulation based on an environmental model and a developmental behavior model

Infant behavior simulation based on an environmental model a...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Y. Nishida Y. Motomura K. Kitamura H. Mizoguchi Digital Human Research Center AIST and CREST JST Koto Tokyo Japan Mechanical Engineering Department Tokyo University of Science Noda Chiba Japan

A computational approach to understanding comprehensively the behavior of infants and children, which is required in clarification of the dynamics of a system that includes behavior-related accidents, is needed. The present paper describes a method for simulating infant behavior in a virtual environment. The determinant factors of infant behavior are classified into internal factors, such as the physical and cognitive capabilities estimated from the age of the infant, and external factors, such as visual stimuli from surrounding objects. An infant behavior simulator is developed herein by modeling these internal and external factors. The present paper reports the effectiveness of the newly developed simulator. This simulator enables analysis of infant accidents at home from an engineering point of view and supports the design of rooms and houses that are safer for infants.

关键词： Injuries Pediatrics Accidents Analytical models humans Virtual environment Mechanical engineering design engineering Public healthcare Cognitive science

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Cooperative Systems design : Scenario-based design of Collaborative Systems

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丛书名： Frontiers in Artificial Intelligence and Applications

2004年

作者： Darses Fran?oise.

ISBN: (纸本)1586034227;141759019X

This publication focuses on the following subjects; understanding and modeling of collaborative work situations which are mediated by technical artefacts, either computational or not; developing appropriate design methodologies for cooperative work analysis and cooperative systems design; developing new technologies supporting cooperation; evaluating and measuring the performance of cooperative systems. The COOP conferences are predicated on the conviction that cooperative systems design requires a deep understanding of the cooperative work of groups and organizations, involving both artefacts and social practices. This is the reason why contributions from all disciplines related to the field of cooperative systems design are considered as relevant, including computer and information sciences (computer-supported cooperative work, group decision support systems, knowledge engineering, human-computer interaction, distributed artificial intelligence and multi-agent systems, etc.) and social sciences (organizational and management sciences, sociology, psychology, ergonomics, linguistics, etc.). This volume puts a special emphasis on the issue of Scenario-Based design of Collaborative Systems. It discusses issues such as scenarios as means for understanding how computer systems might enhance cooperation and scenarios as a common language between users, developers and *** Press is an international science, technical and medical publisher of high-quality books for academics, scientists, and professionals in all fields. Some of the areas we publish in: -Biomedicine -Oncology -Artificial intelligence -Databases and information systems -Maritime engineering -Nanotechnology -Geoengineering -All aspects of physics -E-governance -E-commerce -The knowledge economy -Urban studies -Arms control -Understanding and responding to terrorism -Medical informatics -Computer Sciences

关键词： design systems fron collaborative scenario cooperative based

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Application specific worst case corners using response surfaces and statistical models

Application specific worst case corners using response surfa...

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IEEE International symposium on Quality Electronic design

作者： M. Sengupta S. Saxena L. Daldoss G. Kramer S. Minehane Jianjun Cheng PDF Solutions Inc.orporated Richardson TX USA

Integrated circuits have to be robust to manufacturing variations. This paper presents a new statistical methodology to determine the worst-case corners for a set of circuit performances. Our methodology first estimates response surfaces for circuit performances as quadratic functions of the process parameters with known statistical distributions. These response surface models are then used to extract the worst-case corners in the process parameter space as the points where the circuit performances are at their min/max values corresponding to a specified statistical level. Corners in the process parameter space close to each other are clustered to reduce their number, which reduces the number of simulations required for design verification. We introduce the novel concept of relaxation coefficient to ensure that the corners capture the min/max values of all the circuit performances at the desired statistical level. The corners are realistic since they track the multivariate statistical distribution of the process parameters. Expected worst-case circuit performances can thus be extracted with a small number of simulations suitable for subsequent design verifications. The methodology is demonstrated with examples showing extraction of corners from digital standard cells and also the corners for analog/RF blocks found in typical communication ICs.

关键词： Computer aided software engineering Response surface methodology Circuit simulation Integrated circuit modeling Robustness Statistical distributions Performance evaluation Integrated circuit manufacture Virtual manufacturing Statistical analysis

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数字人体在载人航天器方案设计模型仿真中的应用研究

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系统仿真学报 2004年第7期16卷 1603-1606页

作者：周前祥敬忠良姜世忠航天医学工程研究所北京100094 上海交通大学电子信息学院上海200030

将基于人体测量参数的数字人体模型应用于载人航天器设计方案的仿真评价对发现设计缺陷,提高整个系统的安全可靠性具有重要意义。本文在追踪相关文献的基础上,首先针对人体建模方法及其应用方向进行分析,详细论述国内外在此领域的发展... 详细信息

将基于人体测量参数的数字人体模型应用于载人航天器设计方案的仿真评价对发现设计缺陷,提高整个系统的安全可靠性具有重要意义。本文在追踪相关文献的基础上,首先针对人体建模方法及其应用方向进行分析,详细论述国内外在此领域的发展概况和须着力解决的关键技术问题。最后,提出几点看法以供讨论。

关键词：载人航天器工效学数字人体模型仿真虚拟现实

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Extracting R, L, G, C parameters of dispersive planar transmission lines from measured S-parameters using a genetic algorithm

Extracting R, L, G, C parameters of dispersive planar transm...

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IEEE International symposium on Electromagnetic Compatibility (EMC)

作者： Jianmin Zhang M.Y. Koledintseva J.L. Drewniak G. Antonini A. Orlandi Electromagnetic Compatibility Laboratory University of Missouri - Rolla Rolla MO Department of Electrical Engineering University of L'Aquila L'Aquila Italy

Signal integrity (SI) analysis of printed circuit boards for high-speed digital design requires information on the per-unit-length R, L, G, C parameters of the transmission lines. However, these are not always available when the property of the dielectric medium used in the board is unknown. A method to extract R, L, G, and C parameters from parallel-plate and strip transmission line geometries is proposed. It is based on measured scattering parameters and analytical modeling. A genetic algorithm (GA) is used to optimize the extraction by minimizing the frequency domain discrepancy between an objective function, which is the measured scattering matrix parameter, |S21|, and a GA model based on transmission line theory. The extracted R, L, G, and C parameters are then used in a SPICE model for simulation. Good agreement has been achieved in the reported results.

关键词： Dispersion Planar transmission lines Transmission line measurements Scattering parameters Genetic algorithms Transmission line theory Data mining Dielectric measurements Transmission line matrix methods Circuit analysis

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A new deterministic process based generative model for characterizing bursty error sequences

A new deterministic process based generative model for chara...

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IEEE International symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： C.-X. Wang M. Patzold Faculty of Engineering and Science Agder University College Grimstad Norway

Efficient and accurate generative models are of great importance for the design and performance evaluation of wireless communication protocols as well as error control schemes. In this paper, deterministic processes are utilized to derive a new generative model for the simulation of bursty error sequences encountered in digital mobile fading channels. The proposed deterministic process based generative model (DPBGM) is simply a properly parameterized and sampled deterministic process followed by a threshold detector and two parallel mappers. The target error sequence is generated by a computer simulation of a frequency hopping (FH) convolutionally coded Gaussian minimum shift keying (GMSK) transmission system with Rayleigh fading. Simulation results show that this generative model enables us to match very closely any given gap distribution (GD), error-free run distribution (EFRD), error cluster distribution (ECD), error burst distribution (EBD), error-free burst distribution (EFBD), block error probability distribution (BEPD), and bit error correlation function (BECF) of the underlying descriptive model.

关键词： Character generation Computer errors Computational modeling Wireless communication Wireless application protocol Error correction Fading Detectors Computer simulation Frequency shift keying

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An Adaptive Impedance Matching System and Considerations for a Better Performance

An Adaptive Impedance Matching System and Considerations for...

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The 2004 Joint Conference of the 10～(th) Asia-Pacific Conference on Communications and the 5～(th) International symposium on Multi-Dimensional Mobile Communications

作者： Ichirou IDA Jun-ichi TAKADA Takeshi TODA Yasuyuki OISHI Dept.of International Development Engineering Tokyo Institute of Technology Tokyo 152-8552 Japan Dept. of International Development Engineering Tokyo Institute of Technology Tokyo 152-8552 Japan Fujitsu Limited Yokosuka 239-0847 Japan Fujitsu Limited Yokosuka 239-0847 Japan

An adaptive antenna impedance matching system for mobile communication terminals is proposed. The system adaptively controls two varactors of the pi-network matching circuit detecting the change in the refection coefficient between the antenna combined with the matching circuit and the RF front end of a transceiver. This system consists mainly of analog circuits and employs only a simple algorithm for convergence, therefore does not need any complicated mathematical formulation for modeling of the system itself as well as its nonlinear control elements. Also the proposed system utilizes only simple digital circuits for timing generation. In this paper, the performance of the adaptive impedance matching system is investigated by simulation. The input impedance of the antenna is alternated assuming the change of the environment due to a human head or a hand, and etc. In addition, a better performance is obtained in terms of the input power to the antenna by holding the adaptive control when the reflection is smaller than a certain threshold value. As a result, it is found that the input power to the antenna for transmission can be increased by about 2dB per second compared with a fixed capacitance matching system.

关键词： Adaptive impedance matching, Varactor, Antenna input impedance, Mobile communication terminals

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An adaptive impedance matching system and considerations for a better performance

An adaptive impedance matching system and considerations for...

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Asia-Pacific Conference on Communications

作者： I. Ida J. Takada T. Toda Y. Oishi Department of lnternational Development Engineering Tokyo Institute of Technology Tokyo Japan Fujitsu Laboratories Limited Yokosuka Japan

An adaptive antenna impedance matching system for mobile communication terminals is proposed. The system adaptively controls two varactors of the pi-network matching circuit detecting the change in the refection coefficient between the antenna combined with the matching circuit and the RF front end of a transceiver. This system consists mainly of analog circuits and employs only a simple algorithm for convergence, therefore does not need any complicated mathematical formulation for modeling of the system itself as well as its nonlinear control elements. Also the proposed system utilizes only simple digital circuits for timing generation. The performance of the adaptive impedance matching system is investigated by simulation. The input impedance of the antenna is alternated assuming the change of the environment due to a human head or a hand, and etc. In addition, a better performance is obtained in terms of the input power to the antenna by holding the adaptive control when the reflection is smaller than a certain threshold value. As a result, it is found that the input power to the antenna for transmission can be increased by about 2dB per second compared with a fixed capacitance matching system.

关键词： Adaptive systems Impedance matching Adaptive arrays Circuits Mobile antennas Mobile communication Communication system control Control systems Varactors Radio frequency

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