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IEEE Conference on Decision and Control

作者： G. Pola A.J. van der Schaft M.D. Di Benedetto Department of Electrical Engineering Center of Excellence DEWS University of L'' Aquila Laquila Italy Institute for Mathematics and Computer Science University of Groningam Groningen Netherlands Department of Applied Mathematics University of Twente Enschede Netherlands

Given a plant system and a desired system, we study conditions for which there exists a controller that interconnected with the plant, yields a system that is bisimilar to the desired system. Some sufficient and some necessary conditions are provided in the general case of (non-deterministic) abstract state systems and stronger results are obtained for the special classes of autonomous abstract state systems, finite abstract state systems, and non-deterministic linear dynamical systems.

关键词： Linear systems Control systems Computer science mathematics Control theory Context modeling Control system synthesis Discrete event systems Contracts Set theory

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Optimal call admission control and bandwidth adaptation in multimedia cellular mobile networks

Optimal call admission control and bandwidth adaptation in m...

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12th Analytical and Stochastic Modelling Techniques and Application Conference, ASMTA 2005

作者： Carvalho, Glaucio H.S. Francês, Carlos R.L. Costa, João C.W.A. Rodrigues, Rita C.M. Carvalho, Solon V. Department of Electrical and Computing Engineering Universidade Federal do Pará Augusto Corrêa no. 01 Belém 66075-900 Brazil Laboratory of Computing and Applied Mathematics Instituto Nacional de Pesquisas Espaciais Avenida dos Astronautas no. 1758 São José dos Campos 12201-970 Brazil

ISBN: (纸本)1842331167

Third and future generations of cellular mobile networks are designed to provide adaptive multimedia services with QoS guarantees. In this scenario call admission control and bandwidth adaptation work together in order to improve the system's performance by reducing blocking probability of multimedia calls. However, this improvement is done at cost of the QoS degradation of ongoing multimedia calls, which may be unacceptable to the users of real time services as videoconference, videophone, so on. Another problem concerns with the bandwidth adaptation is that it may consume a lot of wireless and wireline resources due to extra signalling overhead as well as battery power in the mobile station. In addition, frequent bandwidth switching among different bandwidth levels may be worse than a large degradation ratio. Thus, an important aspect to be considered in the design of Radio Resource Management is how to optimize the system's performance by minimizing blocking probability, controlling bandwidth adaptation, and maximizing user's satisfaction. In this paper we address this subject by proposing a Semi-Markov Decision Model that seeks an optimal stationary policy that match this goal. Results show that the optimal policy outperforms the performance of a non-optimal adaptive resource allocation scheme that seeks only to improve blocking probability. © ECMS 2005.

关键词： Wireless networks

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Femtosecond laser ablation of silicon (100) with thermal oxide thin films of varying thickness

Femtosecond laser ablation of silicon (100) with thermal oxi...

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Conference on Lasers and Electro-Optics, CLEO 2005

作者： McDonald, Joel P. Ray, Katherine E. Mistry, Vanita R. Mourou, Gérard Yalisove, Steven M. Center for Ultrafast Optical Science Department of Electrical Engineering University of Michigan Ann Arbor MI 48109-2099 United States Applied Physics Program 2477 Randall Laboratory University of Michigan Ann Arbor MI 48109-1120 United States College of Engineering University of Michigan Ann Arbor MI 48109 United States Department of Materials Science and Engineering 2200 Hayward Street Ann Arbor MI 48109-2136 United States

Femtosecond laser ablation of Silicon (100) with thermal oxide thin films was studied in order to further understand the ablative properties of thin films and to evaluate their influence on the ablation of the substra... 详细信息

ISBN: (纸本)1557527709

关键词： Laser ablation

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A new color demosaicing method using asymmetric average interpolation and its iteration

A new color demosaicing method using asymmetric average inte...

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作者： Takahashi, Yoshihisa Kikuchi, Hisakazu Muramatsu, Shogo Abe, Yoshito Mizutani, Naoki Department of Electrical and Electronic Engineering Niigata University Niigata-shi 950-2181 Japan Industrial Research Institute of Niigata Prefecture Niigata-shi 950-0915 Japan Kodak Digital Product Center Japan Ltd. Chino-shi 391-0293 Japan Niigata University Japan ITE Japan Department of Electrical Engineering IEICE ITE Japan Japan Society for Industrial and Applied Mathematics Research Institute of Signal Processing Japan IEEE SPIE Department of Electrical and Electronic Engineering Japan Japan ITEJ Imaging Society of Japan Japan Research Institute of Signal Processing Japan Kodak Digital Product Center Japan Ltd. Japan

This paper presents a color demosaicing method by introducing iterative asymmetric average interpolation. Missing primary colors on a Bayer pattern color filter array (CFA) are estimated by an asymmetric average interpolation where less intensity variation is assumed to be of stronger significance, before sharpness of an initial estimate is further improved by an iterative procedure. The iteration is implemented by an observation process followed by a restoration process. The former is modeled by blurring followed by CFA sampling and the latter is completely as same as the color demosaicing method initially applied. Experimental results have shown a favorable performance in terms of PSNR and visual appearance, in particular, in sharpness recovery. Copyright © 2005 The Institute of Electronics, Information and Communication Engineers.

关键词： Color image processing

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Design of efficient generation markets

Design of efficient generation markets

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作者： Baldick, Ross Helman, Udi Hobbs, Benjamin F. O'Neill, Richard P. Department of Electrical and Computer Engineering University of Texas Austin TX United States United States Department of Geography and Environmental Engineering Johns Hopkins University Baltimore MD United States Department of Electrical and Computer Engineering University of Texas Austin United States Office of Markets Tariffs and Rates Federal Energy Regulatory Commission Washington DC United States IEEE United States Department of Geography and Environmental Engineering Whiting School of Engineering Johns Hopkins University Baltimore MD United States Department of Applied Mathematics and Statistics United States California ISO Market Surveillance Committee United States Policy Studies Unit Energieonderzoek Centrum Nederlands Netherlands Federal Energy Regulatory Commission Washington DC United States

The design of spot markets for generation services, such as energy, regulation, and operating reserves, and longer term markets for capacity, remain in evolution in many countries. Market design includes definition of the service, bid, or offer requirements, and rules for pricing and financial settlement. In the United States, most organized regional markets have converged on similar elements of spot market design. The design of capacity markets remains influx. Market power mitigation is currently a regulatory requirement in the United States, and experience with different methods shows that it must be carefully aligned with market design to ensure both efficient pricing and efficient investment. This paper surveys these topics and their relationships to each other and identifies researchable issues. © 2005 IEEE.

关键词： Product design

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Feature tracking in VR for cumulus cloud life-cycle studies 05

Feature tracking in VR for cumulus cloud life-cycle studies

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Proceedings of the 11th Eurographics conference on Virtual Environments

作者： E. J. Griffith F. H. Post M. Koutek T. Heus H. J. J. Jonker Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology The Netherlands Department of Multi-Scale Physics Faculty of Applied Sciences Delft University of Technology Netherlands

ISBN: (纸本)9783905673210

Feature tracking in large data sets is traditionally an off-line, batch processing operation while virtual reality typically focuses on highly interactive tasks and applications. This paper presents an approach that uses a combination of off-line preprocessing and interactive visualization in VR to simplify and speed up the identification of interesting features for further study. We couch the discussion in terms of our collaborative research on using virtual reality for cumulus cloud life-cycle studies, where selecting suitable clouds for study is simple for the skilled observer but difficult to formalize. The preprocessing involves identifying individual clouds within the data set through a 4D connected components algorithm, and then saving isosurface, bounding box, and volume information. This information is then interactively visualized in our VR Cloud Explorer with various tools and information displays to identify the most interesting clouds. In a small pilot study, reasonable performance, both in the preprocessing phase and the visualization phase, has been measured.

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First-principles study of the interfacial adhesion between SiO2 and MoSi2

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Physical Review B 2005年第16期72卷 165410-165410页

作者： D. E. Jiang Emily A. Carter Department of Chemistry and Biochemistry Box 951569 University of California Los Angeles California 90095-1569 USA Department of Mechanical and Aerospace Engineering and Program in Applied and Computational Mathematics Princeton University Princeton New Jersey 08544-5263 USA

Upon oxidation, a silica scale forms on MoSi2, a potential high-temperature coating material for metals. This silica scale protects MoSi2 against high-temperature corrosive gases or liquids. We use periodic density functional theory to examine the interface between SiO2 and MoSi2. The interfacial bonding is localized, as evidenced by an adhesion energy that changes only slightly with the thickness of the SiO2 layer. Moreover, the adhesion energy displays a relatively large (0.40J∕m2) variation with the relative lateral position of the SiO2 and MoSi2 lattices due to changes in Si−O bonding across the interface. The most stable interfacial structure yields an ideal work of adhesion of 5.75J∕m2 within the local density approximation (5.02J∕m2 within the generalized-gradient approximation) to electron exchange and correlation, indicating extremely strong adhesion. Local densities of states and electron density difference plots demonstrate that the interfacial Si−O bonds are covalent in character. Mo−O interactions are not found in the SiO2∕MoSi2 interface investigated here. Our work predicts that the SiO2 scale strongly adheres to MoSi2, and further supports the potential of MoSi2 as a high-temperature structural material and coating.

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Physical Review A 2005年第6期71卷 062317-062317页

作者： Somshubhro Bandyopadhyay Indrani Chattopadhyay Vwani Roychowdhury Debasis Sarkar Centre for Quantum Information and Quantum Control Department of Chemistry University of Toronto Toronto Ont. M5S 3H6 Canada Department of Applied Mathematics University of Calcutta Kolkata India Department of Electrical Engineering UCLA Los Angeles CA United States

We show that the Hilbert space of even number (⩾4) of qubits can always be decomposed as a direct sum of four orthogonal subspaces such that the normalized projectors onto the subspaces are activable bound entangled (ABE) states. These states also show a surprising recursive relation in the sense that the states belonging to 2N+2 qubits are Bell correlated to the states of 2N qubits; hence, we refer to these states as Bell-correlated ABE (BCABE) states. We also study the properties of noisy BCABE states and show that they are very similar to that of two qubit Bell-diagonal states.

关键词： Quantum theory

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Pump-probe scheme for optical coherence tomography using indocyanine green mixed with albumin or human plasma

Pump-probe scheme for optical coherence tomography using ind...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Z. Yaqoob J.P. Fingler S. Lintner B.E. Applegate Changhuei Yang Electrical Engineering California Institute of Technology Pasadena CA USA Applied Physics California Institute of Technology Pasadena CA USA Applied & Computational Mathematics California Institute of Technology Pasadena CA USA Department of Biomedical Engineering Duke University Durham NC USA

Use of indocyanine green (ICG) in a pump-probe scheme for OCT is proposed. The study illustrates that ICG in protein solution shows unusual pump-probe imaging potential, indicating its usefulness as a contrast agent f... 详细信息

ISBN: (纸本)1557527954

关键词： Optical pumping Tomography Humans Plasmas Biomedical optical imaging High-resolution imaging Absorption Optical imaging Laser beams Pump lasers

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TRENDS IN SYSTEMS AND SIGNALS

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IFAC Proceedings Volumes 2005年第1期38卷 1-11页

作者： Tohru Katayama Tomas McKelvey Akira Sano Christos Cassandras Marco C. Campi Department of Applied Mathematics and Physics School of Informatics Kyoto University Kyoto 606-8501 Japan Department of Signals and Systems Chalmers University of Technology SE-41296 Gothenburg Sweden Department of System Design Engineering Keio University Yokohama 223-8522 Japan Department of Manufacturing Engineering Boston University MA 02215 USA Department of Electrical Engineering University of Brescia I-25123 Brescia Italy

This report discusses problems and methodologies that lie in the broad scope of systems and signals, with special focus on modeling, identification and signal processing; adaptation and learning; discrete event and hybrid systems; and stochastic systems. A common theme underlying all these areas is that problems in control systems and signals are usually defined and best studied in the framework of stochastic approaches. Although there are common precepts among all these technologies, there are also many unique topics within each area. Therefore, the current key problems in each technology are explained, followed by a discussion of recent major accomplishments with trends, and finally some forecasts of likely developments are provided. The conclusion summarizes some general forecasts for the overall field of systems and signals.

关键词： Systems and signals Modeling System identification Adaptive control Learning Discre event systems Hybrid systems Stochastic systems

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