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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： A.J. Lopez-Martin J. Ramirez-Angulo R.G. Carvajal Department of Electrical and Electronic Engineering Public University of Navarra Pamplona Spain Klipsch School of Electrical and Computer Engineering New Mexico State University Las Cruces NM USA Departmento de Ingenieria Electronica Escuela Superior de Ingenieros Universidad de Sevilla Seville Spain

A recently proposed analog cell suited to low-voltage and low power operation and named "flipped voltage follower" is applied to the design of current conveyors. Two alternative topologies are presented, both operating at 1.5 V and featuring simplicity, compactness, low power consumption and bandwidths up to 100 MHz for a 0.5 /spl mu/m CMOS technology. As an application example, a universal biquadratic filter is designed and simulated.

关键词： Wideband Bandwidth CMOS technology Circuit topology Energy consumption Threshold voltage Current mode circuits Low voltage Design engineering Power engineering and energy

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Plant Uncertainty Contribution to QFT Tracking Control Design

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IFAC Proceedings Volumes 2003年第11期36卷 517-522页

作者： M. Gil-Martínez M. García-Sanz System Engineering and Automation Group Electrical Engineering Department University of La Rioja. Luis de Ulloa 20 26004 Logroño SPAIN. Tf.:+34 941 299496 Automatic Control and Computer Science Department Public University of Navarra. Campus Arrosadía s/n 31006 Pamplona SPAIN Tf.:+34 948 16938

Tracking feedback control trade-offs increase dangerously with arbitrarily large uncertainties in the process model. This is shown by the bounds in the QFT domain. In this context, the paper develops a theory on the contribution of the plant uncertainty to the tracking QFT bounds through a serious study of tracking bound formulas. From this, a methodology for uncertainty fragmentation is developed. It hopes to loosen the bound toughness, or the control design trade-offs. Better feedback benefits can be achieved while reducing the high-frequency amplification of noises and disturbances at the plant input at the same time. Different QFT controllers in a controller-scheduler structure should drive different uncertainty boundaries.

关键词： Quantitative Feedback Theory Robust Control Uncertain Dynamical Systems

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FUSION: a system allowing dynamic Web service composition and automatic execution

FUSION: a system allowing dynamic Web service composition an...

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IEEE International Conference on e-Commerce Technology (CEC)

作者： D. VanderMeer S.B. Navathe A. Datta K. Dutta H. Thomas K. Ramamritham Georgia Inst. of Technology College of Computing Georgia Institute of Technology USA Chutney Technologyies Heinz Sch. of Public Policy Carnegie Mellon University USA Department Computer Sci. and Engineering Indian Institute of Technology Bombay India

Service portals are systems which expose a bundle of Web services to the user, allowing the specification and subsequent execution of complex tasks defined over these individual services. Examples of situations where service portals would be valuable include making travel plans or purchasing a home. Service portals must be capable of converting an abstract user goal into a correct and optimal concrete execution plan, executing according to the plan, verifying the result against a user's stated satisfaction criteria, and in the case of satisfaction failure, initiating the appropriate recovery procedures. The basic framework needed to support this functionality, from gathering the input to generating an optimal plan and executing that plan, is a prerequisite for all service portals, yet there are currently no such commercial systems in existence, and the research literature has given only cursory treatment to some of these issues. In this paper, we describe FUSION, a comprehensive software system which provides the underlying framework for a service portal. We show how using the elements of this framework, service portal designers and architects can easily create domain-specific service portals, e.g., a travel service portal. We also present the Web services execution specification language (WSESL), a language that we have developed to describe execution plans in the context of the FUSION services model. Finally, we develop a set of data structures and algorithms for generating correct and optimal execution plans.

关键词： Web services Portals Fusion power generation Concrete Software systems Travel services Specification languages Context-aware services Context modeling Data structures

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Speakout, Dismantling the U.S. Technology Infrastructure

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IEEE Spectrum 2002年第1期33卷 22-24页

作者： M.G. Morgan R.M. White Department of engineering and public policy Carnegie Mellon University Pittsburgh Department of electrical and computer engineering Carnegie Mellon University

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Advancing social justice as a part of educational leadership development:The potential of imaging technologies

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On the Horizon 2002年第3期10卷 12-15页

作者： Cryss Brunner, C. Hitchon, W. Nick G. Brown, Rachel Department of Electrical and Computer Engineering University of WisconsinMadison Madison Wisconsin United States Department of Educational Policy and Administration University of Minnesota Minneapolis Minnesota United States

We discuss beneficial uses of imaging technologies in higher education that advance social justice. Misuse and ineffectiveness of shared decision making, specifically as related to power relationships and the redistribution of decisionmaking authority, are addressed through the development of technologically delivered experiential simulations (ES). We outline ways in which ES can change higher education preparation programs to meet and adapt to the challenges of the future. ES entails using computer technology to modify a person's appearance and thereby evoking an atypical response from an audience. The key to our proposal, however, is having the person with the modified persona learn lessons pertinent to democratic cultures and social justice from their experience of immersion in that response. © 2002, MCB UP Limited

关键词： Decision making Higher education Leadership Simulation Virtual reality

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Robust specification influence on feedback control strategies 15th

Robust specification influence on feedback control strategie...

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15th World Congress of the International Federation of Automatic Control, 2002

作者： Gil-Martínez, M. García-Sanz, M. System Engineering and Automation Group Electrical Engineering Department University of La Rioja Luis de Ulloa 20 Logroño26004 Spain Automatic Control and Computer Science Department Public University of Navarra Campus Arrosadía Pamplona31006 Spain

ISBN: (纸本)9783902661746

The feedback control structures are required in the presence of any kind of uncertainty. The benefits of the feedback are mainly paid with an excessive bandwidth that amplifies the sensor noise, saturating the actuators. This implies the necessity of design tradeoffs highly transparent from the Quantitative Feedback Theory. Supposing a given uncertainty for a plant, the set of performance and stability requirements will condition the problem solution. Taking advantage of the QFT bound typology and formulation, the contribution of the robust specification values to their simultaneous achievement will be analysed and particularly as regards the challenging task of the controller design. Copyright © 2002 IFAC.

关键词： Controllers

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Potential benefits of implementing load control

Potential benefits of implementing load control

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IEEE Winter Meeting Power engineering Society

作者： M. Ilic J.W. Black J.L. Watz Department of Electrical Engineering and Computer Science MIT Cambridge MA USA Engineering Systems Division in the Technology Management and Policy Program MIT Cambridge MA USA Engineering Systems Division in the Technology and Policy Program MIT Cambridge MA USA

ISBN: (纸本)0780373227

The design of wholesale electricity markets through deregulation has focused almost exclusively on the development of competitive supply (generation). The demand side of the market has been virtually ignored. Mostly, this is due to the assumption that electricity demand is almost completely inelastic. As a result, deregulated wholesale markets universally fail to pass price signals down to the end-users. This paper challenges the assumption of inelastic demand by exploring the potential benefits of implementing a simple load control scheme. This load control scheme allows consumers to shift demand from high priced hours to low priced hours during the day. The benefits to the individual consumer are explored through an example applied to residential air conditioning using price and demand data from California. This example shows that "smart" use of air conditioning can lead to great savings for residential consumers, without sacrificing comfort. The potential for multiple consumers implementing load control to reduce wholesale prices is also examined.

关键词： Load flow control Aggregates Electricity supply industry Power generation Electricity supply industry deregulation Air conditioning Energy management Energy consumption Power engineering and energy Systems engineering and theory

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ROBUST SPECIFICATION INFLUENCE ON FEEDBACK CONTROL STRATEGIES

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IFAC Proceedings Volumes 2002年第1期35卷 425-430页

作者： M. Gil-Martínez M. García-Sanz System Engineering and Automation Group Electrical Engineering Department University of La Rioja. Luis de Ulloa 20 26004 Logroño SPAIN Automatic Control and Computer Science Department Public University of Navarra. Campus Arrosadía 31006 Pamplona SPAIN

关键词： Robust control Uncertain dynamical systems Quantitative Feedback Theory

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Real time nonlinear ARMA model structure identification

Real time nonlinear ARMA model structure identification

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International Conference on Digital Signal Processing (DSP)

作者： E.N. Demiris S.D. Likothanassis B.G. Konstadopoulou D.G. Karelis Department of Computer Engineering and Informatics University of Patras Patras Greece Computer Technology Institute (C.T.I.) Patras Greece University of Patras Artificial Intelligence Research Center Patras Greece Second Public Financial Department of Parras Hellenic Ministry of Finance Patras Greece Department of Electrical Engineering T.E.I. of Patras Patras Greece

This paper addresses the nonlinear autoregressive moving average (NARMA) identification problem in connection with the choice of the model structure (order) and computation of the time varying system coefficients. We introduce an intelligent method that is based on the reformulation of the problem in the standard state space form and the subsequent implementation of a bank of extended Kalman filters, each fitting a different order model. The problem is reduced then to selecting the true model, using the well known multi-model partitioning theory. Simulations illustrate that the proposed method is selecting the correct model order and identifies the time varying model parameters in real time, while it is insensitive to the noise variations.

关键词： Autoregressive processes Signal processing algorithms Signal processing Informatics Artificial intelligence public finance Time varying systems State-space methods Fitting Statistics

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Theoretical studies on optimization of tomographic performance of cone-beam collimator for SPECT scintimammography

Theoretical studies on optimization of tomographic performan...

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IEEE Symposium on Nuclear Science (NSS/MIC)

作者： R.B. Salgado A. Krol D.H. Feiglin K.R. Gangal A.S. Hardikar F.D. Thomas Division of the Natural Sciences and Public Health Dillard University New Orleans LA USA Department of Radiology SUNY Upstate Medical University Syracuse NY USA Department of Electrical Engineering and Computer Science Syracuse University Syracuse NY USA

The major component limiting SPECT performance is the gamma camera collimator. A typical parallel-hole collimator has a low sensitivity yielding noisy tomographic projection images for clinically useful imaging times and radiation dose to the patients. The problem of high noise and low count density, is especially acute in scintimammography due to relatively low uptake in the breast tissue, as compared to the heart and the liver. A practical solution for improved SPECT camera performance in scintimammography might be application of cone-beam collimator (CBC). It offers increased sensitivity in a limited field-of-view (FOV). Disadvantages of CBC include limited and spatially variable FOV, generation of truncation artifacts outside FOV, and more difficult in truly 3D reconstruction. In this paper, we investigate some theoretical aspects of optimization of CBC for applications in SPECT scintimammography.

关键词： Collimators Optical imaging Image reconstruction Cameras Imaging phantoms Biomedical imaging Radiology Single photon emission computed tomography Breast tissue Heart

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