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Panel Discussion Witherto Robust Control

IFAC Proceedings Volumes 2003年第11期36卷 591-597页

作者： Roberto Tempo Tamer Başar Pramod P. Khargonekar Petar V. Kokotovic Carsten W. Scherer IEIIT-CNR Politecnico di Torino Italy Coordinated Science Laboratory University of Illinois at Urbana-Champaign USA College of Engineering University of Florida Gainesville USA Department of Electrical and Computer Engineering University of California at Santa Barbara USA Mechanical Engineering Systems and Control Group Delft University of Technology The Netherlands

A panel discussion with the title Whitherto Robust Control was held during the IEEE Conference on Decision and Control in Honolulu, HI, in December 1990. Organizers and Chairs were B.R. Barmish and P.P. Khargonekar, while the panelists were D.S. Bernstein, S.P. Bhattacharyya, S.P. Boyd, J.C. Doyle, I.M. Horowitz and R.E. Skelton. Today, the goals of researchers working on robust control are probably quite different than thirteen years ago. This seems true both in the progress of novel theoretic paradigms as well as in the developments of new tools required by emerging applications. This panel discussion addresses classical issues and outlines future directions within robust control. We hope that it will contribute to its growth in the years to come. The panelists’ viewpoint are presented in the next pages.

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An efficient collector architecture for digital radiographic imaging czt semiconductor sensors

An efficient collector architecture for digital radiographic...

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IEEE Instrumentation and Measurement Technology Conference

作者： G.C. Giakos N. Shah S. Chowdhury S. Suryanarayanan S. Sumrain R. Guntupalli A. Medithe S. Vedantham V. Kumar R.E. Endorf Imaging Systems Sensors and NanoEngineering Laboratory Department of Electrical and Computer Engineering University of Akron Akron USA Department of Biomedical Engineering University of Akron Akron USA Division of Engineering and Applied Mathematics University of Akron Akron USA Department of Physics University of Cincinnati OH USA

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Chemical liquid-phase detection using guided SH-SAW: theoretical simulation and experiments

Chemical liquid-phase detection using guided SH-SAW: theoret...

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IEEE International Frequency Control Symposium

作者： Zhonghui Li Y. Jones J. Hossenlopp R. Cernosek F. Josse Microsensor Research Laboratory and Department of Electrical and Computer Engineering Marquette University Milwaukee WI USA Department of Chemistry Marquette University Milwaukee WI USA Micro-Analytical Systems Department Sandia National Laboratories Albuquerque NM USA

Results are presented for direct chemical sensing in liquid environments using guided shear horizontal surface acoustic wave (SH-SAW) sensor platforms on 36/spl deg/ rotated Y-cut LiTaO/sub 3/. Two different sensor geometries are theoretically analyzed. Complex bulk and shear moduli are utilized to represent the viscoelastic properties of the polymers and estimate their influence on the velocity shift and attenuation change, hence on the sensor characteristics. Experimental results are presented and discussed for dual delay line devices with a reference line coated with PMMA and a sensing line coated with a chemically sensitive polymer, which acts as both a guiding layer and a sensing layer. Various chemically sensitive polymers are investigated, and the tested analytes include toluene, ethylbenzene and xylene. Analytes in the low concentration (1 ppm to 60 ppm) range in aqueous solutions are tested. Stability, sensitivity and partial selectivity are investigated by varying the coating thickness and curing temperature for the chemically sensitive layer. Partition coefficients for polymer-aqueous analyte pairs are used to explain the observed trend in sensitivity. Both mass loading and the coating viscoelasticity change influence the sensor response. A low ppb level detection limit is estimated from the present experiment measurement.

关键词： Chemical sensors Sensor phenomena and characterization Polymers Acoustic sensors Viscosity Elasticity Chemical analysis Testing Coatings Acoustic signal detection

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Modeling of the excitation of terahertz plasma oscillations in a HEMT by ultrashort optical pulses

Modeling of the excitation of terahertz plasma oscillations ...

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IEEE/LEOS International Conference on Numerical Simulation of Semiconductor Optoelectronic Devices

作者： M. Ryzhii A. Satou I. Khmyrova V. Vyukov V. Ryzhii M.S. Shur Computer Solid State Physics Laboratory University of Aizu Aizu-Wakamatsu Japan Comput. Solid State Phys. Lab. Aizu Univ. Aizu-Wakamatzu Japan Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy USA

Device models for the HEMT-based THz source are developed: an all-analytical model and a model in which the electron systems in the channel is considered analytically in the linear approximation, whereas the transport of the photogenerated electrons and holes is treated invoking an ensemble Monte Carlo particle simulation. Using these models, the frequency-dependent currents and device responsivity as functions of the structural parameters, gate voltage, and energy of the absorbed optical photons are calculated. An example of the dependences calculated for HEMTs with the fundamental plasma frequency f/sub P/ = 1 THz and different values of the electron mobility /spl mu/ in the channel is performed.

关键词： HEMTs Optical pulses Plasma devices Charge carrier processes Frequency Plasma sources Plasma transport processes Linear approximation Monte Carlo methods Analytical models

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Evolutionary multi-criterion optimization

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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2003年 2632卷

作者： Fonseca, Carlos M. Fleming, Peter J. Zitzler, Eckart Deb, Kalyanmoy Thiele, Lothar University of the Algarve Centre for Intelligent Systems Campus de Gambelas Faro Portugal University of Sheffield Department of Automatic Control and Systems Engineering Mappin Street Sheffield United Kingdom Swiss Federal Institute of Technology Department of Electrical Engineering Computer Engineering and Networks Laboratory Gloriastrabe 35 Zurich Switzerland Indian Institute of Technology Department of Mechanical Engineering Kanpur Genetic Algorithms Laboratory Kanpur India

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engineering tools to support interoperability in the development and maintenance of heterogeneous distributed real-time control systems

Engineering tools to support interoperability in the develop...

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International Conference on Distributed Computing systems Workshop

作者： A.S. Prayati A.P. Kalogeras K. Lorentz S. Koubias Applied Electronics Laboratory Department of Electrical Engineering & Computer Science University of Patras Patras Greece Industrial Systems Institute University of Patras Patras Greece Otto-von-Guericke IAF University of Magdeburg Magdeburg Germany

Some of the basic innovative trends of the industrial environment, today, are the shift from centralized control architectures to distributed systems, as well as the increasing degree of heterogeneity. These features impose the need for special software tools that support the design of control applications in a homogeneous and interoperable way, as well as their distribution to the interconnected participating industrial devices. The utilisation of the internet and the provision of e-services to the industry will also lead to the distribution of management functionalities in addition to control code distribution. Such an evolution requires both a new model for industrial devices as well as a design and deployment tool that will make possible the distribution of functionalities to industrial devices. This paper presents the state-of-the-art considering distributed industrial system design and concludes with a specification of distributed systems, enabling the incorporation of novel advanced functionalities.

关键词： Real time systems Distributed control Control systems electrical equipment industry Industrial control Centralized control computer architecture Software tools Application software computer industry

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Medium access control in multihop networks

Medium access control in multihop networks

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MILCOM, Military Communications Conference

作者： J.E. Wieselthier G.D. Nguyen A. Ephremides Information Technology Division Naval Research Laboratory Inc. Washington D.C. DC USA Electrical and Computer Engineering Department and Institute for Systems Research University of Maryland College Park MD USA

In this paper, we address the problem of medium-access control (MAC) in multihop networks. We focus on the first-come, first-serve (FCFS) collision-resolution algorithm, and for the two-destination case illustrate the difficulties that arise because of the interference between two populations of nodes that share a common channel. Specifically, a deadlock can arise when a commonly used improvement to the FCFS algorithm for the single-destination case is used. To eliminate this deadlock, we use a "group TDMA" mechanism, which separates the interfering groups, while permitting use of the best version of the FCFS algorithm. We demonstrate that use of group TDMA in conjunction with the FCFS algorithm can provide increased throughput and energy efficiency. Additionally, we extend our model to a cellular-like multihop network.

关键词： Media Access Protocol Intelligent networks Spread spectrum communication System recovery Interference Time division multiple access Access protocols Information technology Laboratories computer networks

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RJSSIM: A reconfigurable job scheduling smulator for parallel processing learning

RJSSIM: A reconfigurable job scheduling smulator for paralle...

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Frontiers in Education (FIE) Conference

作者： L.FW. Goes C.A.P.S. Martins Electrical Engineering Computational and Digita Systems Laboratory Pontifical Catholic University of Minas Gerais Belo Horizonte Minas Gerais Brazil Computer Science Department Elechical Engineering Computational and Digital System Laboratory Pontifical Catholic University of Minas Gerais Belo Horizonte Minas Gerais Brazil

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Significance of intracranial pressure pulse morphology in pediatric traumatc brain injury

Significance of intracranial pressure pulse morphology in pe...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： M. Aboy J. McNames D. Cuesta-Frau W. Wakeland T. Thong S. Lai B. Goldstein Biomedical Signal Processing Laboratory Electrical and Computer Engineering Portland State University Portland OR USA Computer Vision Group ETS-Alcoi Polytechnic University of Valencia Spain Systems Science Ph.D. Program Portland State University Portland OR USA Biomedical Engineering OGI School of Science and Engineering Oregon Health and Sciences University Portland OR USA Complex Systems Laboratory Department of Pediatrics Oregon Health and Sciences University Portland OR USA

We investigated the relationship between the intracranial pulse pressure (ICP/sub PP/) and the mean intracranial pressure (ICP/sub M/). In adult patients, several research groups have described a linear relationship between ICP/sub PP/ and ICP/sub M/ within the range of cerebral autoregulation. Current monitoring and therapy are mainly based on the mean ICP/sub M/, since it is believed that the ICP/sub M/ contains most of the information provided by the other pulse morphology metrics. In this paper we attempt to answer whether there is further information within the ICP morphology not explained by ICP/sub M/ that might be of prognostic significance. We screened ICP records of 42 patients admitted to the Pediatric Intensive Care Unit at Doernbecher Children's Hospital for segments in which the ICP/sub M/ varied at least 5 mmHg during a 1-hour period. We found 54 segments in 9 different pediatric TBI patients (ages 0.2-17.8 years, mean=9.9 years). ICP/sub PP/ and ICP/sub M/ were calculated for each pulse using an automatic pressure detection algorithm. The coefficient of linear correlation r was > 0.70 in 43/54 segments (p < 0.001), which indicates that there exists a linear relationship between ICP/sub PP/ and ICP/sub M/. However, we found r > 0.90 only in 16/54 segments (p=NS) . This result and visual inspection of ICP/sub PP/ vs. ICP/sub M/ density plots suggest that ICP pulse pressure is not fully explained by the ICP M.

关键词： Cranial pressure Morphology Brain injuries Iterative closest point algorithm Pediatrics Patient monitoring Medical treatment Hospitals Detection algorithms Inspection

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Automatic face region tracking for highly accurate face recognition in unconstrained environments

Automatic face region tracking for highly accurate face reco...

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IEEE Conference on Advanced Video and Signal Based Surveillance (AVSS)

作者： Y.-O. Kim J. Paik Jingu Heo A. Koschan B. Abidi M. Abidi Korea Electronics and Technology Institute Puchon Gyeonggi South Korea Image Processing Laboratory Department of Image Engineering Graduate School of Advanced Imaging Science Multimedia and Film Chung-Ang University Seoul South Korea Imaging Robotics and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Tennessee Knoxville USA

We present a combined real-time face region tracking and highly accurate face recognition technique for an intelligent surveillance system. High-resolution face images are very important to achieving accurate identification of a human face. Conventional surveillance or security systems, however, usually provide poor image quality because they use only fixed cameras to record scenes passively. We have implemented a real-time surveillance system that tracks a moving face using four pan-tilt-zoom (PTZ) cameras. While tracking, the region-of-interest (ROI) can be obtained by using a low-pass filter and background subtraction with the PTZ. Color information in the ROI is updated to extract features for optimal tracking and zooming. FaceIt/sup /spl reg//, which is one of the most popular face recognition software packages, is evaluated and then used to recognize the faces from the video signal. Experimentation with real human faces showed highly acceptable results in the sense of both accuracy and computational efficiency.

关键词： Face recognition Surveillance Real time systems Humans Cameras Intelligent systems Security Image quality Layout Low pass filters

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