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Annual business and news:: Beginning the 31st year of the Journal of Guidance, control, and Dynamics

JOURNAL OF GUIDANCE control AND DYNAMICS 2008年第1期31卷 1-1页

作者： Schmidt, George T. Aeronautics and Astronautics Massachusetts Institute of Technology (MIT) AIAA Institute of Electrical and Electronics Engineers Russian Federation Academy of Navigation and Motion Control Department of Mechanical and Aerospace Engineering and Engineering Mechanics University of Missouri-Rolla(UMR) Lockheed Electronics Company Center for Space Research University of Texas Austin United States Wright Laboratory Eglin Air Force Base UMR AIAA Guidance Navigation and Control Technical Committee American Automatic Control Council Lockheed Martin Aeronautics Company Palmdale CA United States C4ISR and Unmanned Air Vehicle (UAV) Programs for Air Vehicle Sciences and Systems Accreditation Board Engineering and Technology Inc./Aeronautical National Technical Committee on Guidance Navigation and Control Department of Mechanical and Aerospace Engineering University at Buffalo State University of New York (SUNY) AIAA Technical Committee on GN and C Air Vehicles Directorate Air Force Research Laboratory (AFRL) Wright-Patterson Air Force Base Space Access and Hypersonic Vehicle Guidance and Control Group Control Science Center of Excellence AFRL AIAA Technical Committee on Guidance Navigation and Control Department of Mechanical and Aeronautical Engineering University of California (UC) Davis United States Boeing Company Modernized Flight Control System for the Apache Longbow AIAA Institute of Electrical and Electronics Engineers AHS Jet Propulsion Laboratory California Institute of Technology Boeing Company Flight Sciences and Advanced Design Group Guidance Navigation and Control (GN and C) Systems Engineer Distributed Space Systems NASA Goddard Space Flight Center (GSFC) AIAA GN and C Technical Committee Department of Aerospace Engineering and Engineering Mechanics University of Texas Austin United States Institute of Navigation American Astronautical Society AIAA Guidance Navigation (GN and C) and Control Technical Committee Department of Aerospace Engineering Iowa State University Iowa

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Towards an inclusive computational model of visual cortex

Towards an inclusive computational model of visual cortex

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IEEE Symposium on Bioinformatics and Bioengineering (BIBE)

作者： M. Gheiratmand H. Soltanian-Zadeh H. Khaloozadeh Electrical Engineering Department K.N. Toosi University of Technology Tehran Iran Radiology Department Henry Ford Health System Image Analysis and Communications Laboratory Detroit MI USA School of Cognitive Sciences Institute for Studies Theoretical Physics and Mathematics (IPM) Tehran Iran Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran Tehran Iran

Understanding the primatespsila visual system has been one of the challenging problems of different groups of scientists for years. Though many studies, from physiology and neuroscience to computer vision, are done on different aspects of visual processing in the cortex, a comprehensive computational model of visual cortex is still missing. We have implemented a computational model of object recognition in ventral visual pathway in our previous work. This hierarchical model covers visual areas V1/V2, V4/PIT, and AIT sending inputs to the Prefrontal Cortex (PFC) for categorization. To extend our model, in this work, we have added a simple model of motion detection in neurons of areas V1 and MT of the dorsal stream to our previous model. This has enabled the model to perform another principal function of the visual cortex, i.e., motion perception.

关键词： Brain modeling Computational modeling Neurons Biological system modeling Object recognition Motion analysis Solid modeling Visual system computer vision Motion detection

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Level-triggered control of a scalar linear system

Level-triggered control of a scalar linear system

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2007 Mediterranean Conference on control and Automation, MED

作者： Rabi, Maben Baras, John S. Automatic Control Laboratory School of Electrical Engineering Royal Institute of Technology Stockholm 100 44 Sweden Institute for Systems Research Department of Electrical and Computer Engineering University of Maryland College Park MD 20742 United States

ISBN: (纸本)142441282X

In networked control systems, because of limits on communication rates, control waveforms are frequently piece-wise constant with limits on rates at which they can switch levels. It is, therefore, natural to expect event-triggered control switchings to perform more efficiently than time-triggered ones. This article verifies the validity of this supposition. A method for designing good level-triggered control schemes is obtained by reducing the continuous time problem to one in discrete time. Then, by numerical procedures, the performance of the level-triggered scheme is computed for comparison with that of the periodically switched control scheme. © 2007 IEEE.

关键词： Networked control systems

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Level-triggered control of a scalar linear system

Level-triggered control of a scalar linear system

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Mediterranean Conference on control and Automation (MED)

作者： Maben Rabi John S. Baras Automatic Control Laboratory School of Electrical Engineering Royal Institute of Technology Stockholm Sweden Institute for Systems Research and Department of Electrical and Computer Engineering University of Maryland College Park MD USA

关键词： control systems Linear systems Communication system control automatic control Switches Communication switching Signal sampling Signal processing Laboratories Educational institutions

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Localized Multiple Next-hop Routing Protocol (LMNR)

Localized Multiple Next-hop Routing Protocol (LMNR)

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International Conference on ITS Telecommunications (ITST)

作者： Shekar Nethi Chao Gao Riku Jantti Mikael Pohjola Communications Laboratory Helsinki University of Technology Espoo Finland Department of Computer Science University of Vaasa Finland Department of Information Technology Vaasa University of Applied Sciences Vaasa Finland Control Engineering Laboratory Helsinki University of Technology Espoo Finland

In this paper we propose a novel reactive multi-path routing protocol for wireless (and vehicular) ad-hoc networks. The proposed scheme tries to establish and maintain local multiple paths to a certain destination, instead of finding multiple global paths between the source and destination nodes as most other multipath solutions do. To achieve this, we adopt and modify the well-known reactive routing protocol AODV. Using this scheme, source node and intermediate nodes are able to find a better next-hop dynamically when the network topology or traffic activity are changed. A cost function is given to let the related nodes to make decisions. NS-2 simulations show that our scheme gives significant improvement in terms of packet delivery ratio, routing overhead, and energy consumption.

关键词： Routing protocols Laboratories Cost function Energy efficiency Broadcasting Chaos computer science Information technology Maintenance engineering Ad hoc networks

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A Mixed H2/H∞ control Problem with controller Degree Constraint

A Mixed H2/H∞ Control Problem with Controller Degree Constr...

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IEEE Conference on Decision and control

作者： Ningbo Yu Li Qiu Automatic Control Laboratory ETH Zurich Zurich Switzerland Department of Electronic & Computer Engineering Hong Kong University of Science and Technology Hong Kong China

ISBN: (纸本)1424401704;9781424401703

In this paper, we consider a special mixed H 2 /H ∞ optimal control problem which is to obtain the optimal H 2 controller under H ∞ norm and controller degree constraints for an SISO plant. The H ∞ norm constraint on the controller is to achieve a certain level of closed-loop stability robustness against the gap metric, nu-gap metric, or normalized coprime factor uncertainties. The degree constraint requires the degree of the controller to be bounded by that of the plant. We first characterize the set of all feasible stabilizing controllers that meet both the degree and H ∞ norm constraints in terms of a finite dimensional convex set. We then carry out an optimization over the convex parameter set to find the controller that gives the optimal H 2 transient performance. Examples and observations are presented, and comparisons with the results obtained by other H 2 /H ∞ mixed optimization methods are made

关键词： Optimal control Hydrogen Upper bound Robust stability Robust control Feedback Attenuation measurement Riccati equations Centralized control USA Councils

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ADAPTIVE KERNEL DISCRIMINANT ANALYSIS AND ITS APPLICATIONS ON PATTERN RECOGNITION

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International Journal of Information Acquisition 2006年第4期3卷 329-337页

作者： JUN-BAO LI JENG-SHYANG PAN Department of Automatic Test and Control Harbin Institute of Technology Harbin China Group Laboratory Address Department of Electronic Engineering National Kaohsiung University of Applied Sciences Kaohsiung Taiwan R.O.C

In pattern recognition, feature extraction techniques are widely employed to reduce the dimensionality of data and to enhance the discriminatory information. In this paper, we present an extension of KFD method based on the data-dependent kernel, called the adaptive kernel discriminant analysis (AKDA), for feature extraction and pattern classification. AKDA is more adaptive to the input data than KDA owing to the optimization of projection from input space to feature space with the data-dependent kernel, which enhances the performance of KDA. Experimental results on ORL, Yale and MNIST database show that the proposed AKDA gives the higher performance than KDA.

关键词： Kernel discriminant analysis adaptive kernel discriminant analysis kernel method feature extraction

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Integrated information processing and communications: Complexity analysis

Integrated information processing and communications: Comple...

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IASTED International Conference on COMMUNICATION SYSTEMS AND APPLICATIONS Part of the Sixth IASTED International Multi-Conference on WIRELESS AND OPTICAL COMMUNICATIONS

作者： Huyu, Qu Le, Yi Wang Yaprak, Ece Hong, Wang Yanlong, Zhao Department of Electrical and Computer Engineering Wayne State University Detroit MI 48202 United States Division of Engineering Technology Wayne State University Detroit MI 48202 United States Department of Anesthesiology Wayne State University Detroit MI 48202 United States Key Laboratory of System and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences China

Accuracy of information transmission when a signal must be transmitted through a communication channel is of essential importance in design of communication systems. When system resources are limited, such as transmission bandwidths assigned to a wireless communication channel, appropriate utility of available resources becomes imperative. This paper investigates fundamental relationships between accuracy of information exchange and communication resources, on a platform of wireless communication channels that involve typical system blocks of data compression, quantization, and stochastic wireless channels. The main complexity relationships developed in this paper provide rigorous trade-off between resource consumptions and information processing errors of each block. When these relationships are integrated, an optimization procedure emerges that allows optimal allocation of resources to each system block, such as compression ratio, quantization levels, and transmission speed, to maximize overall information accuracy. Consequently, the overall errors of the transmitted signal will be minimized at the receiver end.

关键词： Data processing

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Measured disturbance estimation for model predictive controller

Mediterranean Journal of Measurement and Control

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Mediterranean Journal of Measurement and control 2006年第3期2卷 144-151页

作者： Kulcsar, Balazs Bokor, J. Department of Transport Automation Faculty of Transportation Engineering Budapest University of Technology and Economics Budapest Hungary System and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Budapest Hungary

This paper presents the Model Predictive controller design process when an unknown input observer provides measured disturbance form unmeasured one. Instead of using an unmeasured disturbance dynamic implemented into the controller, the joint observer-controller uses the estimated measured exogenous disturbance signal. Furthermore the observer can send an alarm sign to the supervisor. The detection and isolation of the unmeasured disturbance is computed by the geometric based strategy called Fundamental Problem in Residual Generation. Better the estimation of the disturbance is, better the rejection of the controller. The measured disturbance could be anticipated. A numerical example explains the effectiveness of the estimation and the usage of the unmeasured disturbance detection. Copyright © 2006 SoftMotor Ltd.

关键词： Predictive control systems

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High SNR flexible top hat monopole probe for 1.5 T MRI

High SNR flexible top hat monopole probe for 1.5 T MRI

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作者： Mohammadzadeh, M. Shahabadi, M. Soltanian-Zadeh, H. Tavakoli, A. Rafiei, B. Javidnia, D. Oghabian, M.A. Department of Physics Amir-Kabir University of Technology Tehran Iran School of Electrical and Computer Engineering University of Tehran Tehran Iran Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Tehran Iran Image Analysis Laboratory Department of Radiology Henry Ford Health System Detroit MI United States Department of Electrical Engineering Amir-Kabir University of Technology Tehran Iran Medical Imaging Center Imam Khomeyni Hospital Tehran Iran Research Center for Science and Technology in Medicine Tehran University of Medical Sciences Tehran Iran

In this paper, design principles and application of a thin and flexible intravascular top hat monopole probe with increased signal-to-noise ratio (SNR) and improved longitudinal and radial coverage are described and compared with the conventional monopole probe. The top hat probe is constructed by removing a segment of the shield of a coaxial cable. A flexible thin copper foil in contact with the inner conductor of the cable is added to the end section of the cable. The copper foil acts as an antenna top hat load increasing the uniformity of the current distribution on the probe and establishes a uniform region of SNR distribution around the probe. Improvement of the SNR distribution of the top hat probe relative to the conventional monopole probe is evaluated using quantitative indices. Experimental results show that for the top hat probe, the ratio of the maximum image SNR to its relative standard deviation (SR) is 2.73 times higher than that of a conventional probe. © 2006 IOP Publishing Ltd.

关键词： Medical imaging

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