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IEEE Conference on Decision and Control

作者： Leonid Fridman Arie Levant Jorge Davila Department of Control Division of Electrical Engineering Engineering Faculty National Autonomous University of Mexico (UNAM) Mexico Applied Mathematics Department School of Mathematical Sciences Tel-Aviv University Tel-Aviv Israel

ISBN: (纸本)1424401704;9781424401703

A high-order sliding-mode observer is designed for linear time invariant systems with bounded unknown inputs, providing for the global observation of the state and the inputs under sufficient and necessary conditions of strong observability or strong detectability. The observation is finite-time-convergent and exact in the strong observability case. The accuracy of the proposed observation and identification schemes is estimated via the sampling step or magnitude of deterministic noises

关键词： Linear systems Observability Control systems Noise robustness State estimation Sampling methods Convergence Observers Sliding mode control USA Councils

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Interactions between Individual Carbon Nanotubes Studied by Rayleigh Scattering Spectroscopy

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Physical Review Letters 2006年第16期96卷 167401-167401页

作者： Feng Wang Matthew Y. Sfeir Limin Huang X. M. Henry Huang Yang Wu Jaehee Kim James Hone Stephen O’Brien Louis E. Brus Tony F. Heinz Departments of Physics and Electrical Engineering Columbia University New York New York 10027 USA Department of Chemistry Columbia University New York New York 10027 USA Department of Applied Physics and Applied Mathematics Columbia University New York New York 10027 USA Department of Mechanical Engineering Columbia University New York New York 10027 USA

The electronic properties of single-walled carbon nanotubes (SWNTs) are altered by intertube coupling whenever bundles are formed. These effects are examined experimentally by applying Rayleigh scattering spectroscopy to probe the optical transitions of given individual SWNTs in their isolated and bundled forms. The transition energies of SWNTs are observed to undergo redshifts of tens of meVs upon bundling with other SWNTs. These intertube coupling effects can be understood as arising from the mutual dielectric screening of SWNTs in a bundle.

关键词： .bundles SWNTs optical transitions Rayleigh Scattering York New intertube transition energies redshifts

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Dissipative boundary control systems with application to distributed parameters reactors

Dissipative boundary control systems with application to dis...

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IEEE International Conference on Computer-Aided Design

作者： Y. Le Gorrec B. Maschke J.A. Villegas H. Zwart LAGEP UCB Lyon 1-UFR-CNRS UMR 5007 CPE Lyon Villeurbanne France Department of Applied Mathematics Faculty of Electrical Engineering Mathematics and Computer Science University of Twente Enschede Netherlands

In this paper we consider distributed parameter physical systems composed of a reversible part associated with a skew-symmetric operator J as Hamiltonian systems (Olver, 1993) and a symmetric operator associated with some irreversible phenomena. We will show how to use results obtained on reversible systems to parametrize the boundary conditions such that the solution of the associated PDE is contractive. The theoretical results are applied to the example of a tubular reactor with first order chemical reaction. The obtained parametrization is compared with the classical Dankwert conditions

关键词： Control systems Inductors Boundary conditions Thermodynamics mathematics Kinetic theory Chemical reactors Differential equations Ear Computer science

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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 2006

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)1557528136

关键词： Laser ablation

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Tomography of scale-free networks and shortest path trees

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Physical Review E 2006年第6期74卷 066108-066108页

作者： Tomer Kalisky Reuven Cohen Osnat Mokryn Danny Dolev Yuval Shavitt Shlomo Havlin Minerva Center and Department of Physics Bar-Ilan University 52900 Ramat-Gan Israel Department of Computer Science and Applied Mathematics Weizmann Institute of Science Rehovot Israel Department of Electrical Engineering-Systems Tel-Aviv University Tel-Aviv Israel School of Engineering and Computer Science Hebrew University Jerusalem Israel

In this paper we model the tomography of scale-free networks by studying the structure of layers around an arbitrary network node. We find, both analytically and empirically, that the distance distribution of all nodes from a specific network node consists of two regimes. The first is characterized by rapid growth, and the second decays exponentially. We also show analytically that the nodes degree distribution at each layer exhibits a power-law tail with an exponential cutoff. We obtain similar empirical results for the layers surrounding the root of shortest path trees cut from such networks, as well as the Internet.

关键词： EXPLORATION PERCOLATION INTERNET TOPOLOGY GRAPHS

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Static controller for ventilation of highway tunnels

Static controller for ventilation of highway tunnels

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作者： Ferkl, Lukáš Meinsma, Gjerrit Sládek, Oto Department of Control Engineering Faculty of Electrical Engineering Czech Technical University in Prague Technická 2 166 27 Praha 6 Czech Republic Department of Applied Mathematics Faculteit EWI University of Twente P.O. Box 217 7500 AE Enschede Netherlands Kybertec Ltd. Tovární 1112 537 01 Chrudim Czech Republic Center for Applied Cybernetics Institute of Information Theory and Automation Academy of Sciences of the Czech Republic Pod vodárenskou věží 4 182 08 Praha 8 Czech Republic

A control scheme for highway tunnels is proposed based on a static model of the highway tunnel. The controller is designed to keep the exhaust levels inside the tunnel below given limits. The controller is derived in two stages. First, a controller for an isolated ventilation section is found. Then a controller for a complex tunnel is obtained and the control is optimized by means of linear programming. The control is then simulated on a dynamical model of a highway tunnel.

关键词： Controllers

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On the Pseudospectral Covector Mapping Theorem for Nonlinear Optimal Control

On the Pseudospectral Covector Mapping Theorem for Nonlinear...

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IEEE Conference on Decision and Control

作者： Qi Gong I. Michael Ross Wei Kang Fariba Fahroo Department of Electrical & Computer Engineering University of Technology San Antonio USA Department of Mechanical and Astro. Engineering Naval Postgraduate School Monterrey CA USA Applied Mathematics Naval Postgraduate School Monterrey CA USA Applied Math Naval Postgraduate School Monterrey CA USA

ISBN: (纸本)1424401704;9781424401703

In recent years, a large number of nonlinear optimal control problems have been solved by pseudospectral (PS) methods. In an effort to better understand the PS approach to solving control problems, we present convergence results for problems with mixed state and control constraints. A set of sufficient conditions are proved under which the solution of the discretized optimal control problem converges to the continuous solution. Conditions for the convergence of the duals are described and illustrated. This leads to a clarification of covector mapping theorem and its connections to constraint qualifications

关键词： Optimal control Software packages Nonlinear systems Nonlinear equations USA Councils Problem-solving Convergence Differential equations Feedback Sufficient conditions

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High-Order Sliding-Mode Observer for Linear Systems with Unknown Inputs

High-Order Sliding-Mode Observer for Linear Systems with Unk...

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International Workshop on Variable Structure Systems, VSS

作者： L. Fridman A. Levant J. Davila Department of Control Division of Electrical Engineering Facultad de Ingenieria Universidad Nacional Autonoma de Mexico Mexico Applied Mathematics Department School of Mathematical Sciences Tel-Aviv University Tel-Aviv Israel

Extended sufficient conditions for the observation of linear time invariant systems with unknown inputs are formulated. A new observation scheme is proposed. An additional linear term ensuring global stability is included for this sake in the differentiation algorithm based on high-order sliding-modes. The global robust finite-time-convergent estimation of observable states and unknown inputs is obtained, exact in the absence of measurement noises. Under the detectability conditions the whole state is asymptotically estimated. The accuracy of the estimation in the presence of bounded deterministic Lebesgue-measurable noises and discrete sampling is worked out

关键词： Linear systems Observers Time invariant systems Noise robustness State estimation Noise measurement Sampling methods Stability Convergence Vectors

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A Control Theoretic Approach to Run-Time Energy Optimization of Pipelined Processing in MPSoCs 06

A Control Theoretic Approach to Run-Time Energy Optimization...

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Design, Automation and Test in Europe Conference and Exhibition

作者： A. Alimonda A. Acquaviva S. Carta A. Pisano Department of Mathematics and Informatics University of Cagliari Cagliari Italy Center for Applied Information Science and Technology (STI) University of Urbino Urbino Italy Department of Electrical and Electronic Engineering (DIEE) University of Cagliari Cagliari Italy

ISBN: (纸本)9783981080100

In this work we take a control-theoretic approach to feedback-based dynamic voltage scaling (DVS) in multi processor system on chip (MPSoC) pipelined architectures. We present and discuss a novel feedback approach based on both linear and non-linear techniques aimed at controlling interprocessor queue occupancy. Theoretical analysis and experiments, carried out on a cycle-accurate multiprocessor simulation platform, show that feedback-based control reduces energy consumption with respect to standard local DVS policies and highlight that non-linear strategies allows a more flexible and robust implementation in presence of variable workload conditions

关键词： Runtime Frequency Voltage control Control systems Dynamic voltage scaling Queueing analysis Linear feedback control systems Feedback control Proportional control Clocks

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Non-Linear Feedback Control for Energy Efficient On-Chip Streaming Computation

Non-Linear Feedback Control for Energy Efficient On-Chip Str...

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International Symposium on Industrial Embedded Systems

作者： Andrea Alimonda Salvatore Carta Andrea Acquaviva Alessandro Pisano Department of Mathematics and Informatics University of Cagliari Cagliari Italy Center for Applied Information Science and Technology (STI) University of Urbino Urbino Italy Department of Electrical and Electronic Engineering (DIEE) University of Cagliari Cagliari Italy

In this work we take a control theoretic approach to the dynamic voltage/frequency scaling (DVS) in a MPSoC architecture with mixed pipelined/parallel processing. The aim is that of minimizing energy consumption with throughput guarantees. Theoretical analysis and experiments, carried out on a cycle-accurate, energy-aware, multiprocessor simulation platform, are provided. We give a dynamic model of the system behavior on the basis of which we synthesize a non-linear feedback controller for the run-time adjustment the frequencies of the processing stages. We compare, from an energy consumption viewpoint, the proposed feedback approaches with local DVS policies.

关键词： Feedback control Energy efficiency Voltage control Nonlinear dynamical systems Energy consumption Dynamic voltage scaling Frequency Computer architecture Parallel processing Throughput

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