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Medical Imaging 2009: Biomedical Applications in Molecular, Structural, and Functional Imaging

作者： Babajani-Feremi, Abbas Bowyer, Susan Moran, John Elisevich, Kost Soltanian-Zadeh, Hamid Image Analysis Lab. Radiology Department Henry Ford Hospital Detroit MI 48202 United States Neuromagnetism Lab. Neurology Department Henry Ford Hospital Detroit MI 48202 United States Department of Neurology Henry Ford Hospital Detroit MI 48202 United States Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran Tehran 14395-515 Iran

ISBN: (纸本)9780819475138

The integrated analysis of the Electroencephalography (EEG), Magnetoencephalography (MEG), and functional magnetic resonance imaging (fMRI) are instrumental for functional neuroimaging of the brain. A bottom-up integrated E/MEG and fMRI model based on physiology as well as a method for estimating its parameters are keys to the integrated analysis. We propose the variational Bayesian expectation maximization (VBEM) method to estimate parameters of our proposed integrated model. VBEM method iteratively optimizes a lower bound on the marginal likelihood. An iteration of the VBEM consists of two steps: a variational Bayesian expectation step implemented using the extended Kalman smoother (EKS) and the posterior probability of the parameters in the previous step, and a variational Bayesian maximization step to estimate the posterior distributions of the parameters. For a given external stimulus, a variety of multi-area models can be considered in which the number of areas and the configuration and strength of connections between the areas are different. The proposed VBEM method can be used to select an optimal model as well as estimate its parameters. The efficiency of the proposed VBEM method is illustrated using simulation and real datasets. The proposed VBEM method can be used to estimate parameters of other non- linear dynamical systems. This study proposes an effective method to integrate E/MEG and fMRI and plans to use these techniques in functional neuroimaging. © 2009 SPIE.

关键词： Electroencephalography

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Gait Recognition Using Wavelet Packet Silhouette Representation and Transductive Support Vector Machines

Gait Recognition Using Wavelet Packet Silhouette Representat...

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Congress on Image and Signal Processing, CISP

作者： Farzin Dadashi Babak N. Araabi Hamid Soltanian-Zadeh 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 Hospital Detroit MI USA

Gait is an idiosyncratic biometric that can be used for human identification at a distance and as a result gained growing interest in intelligent visual surveillance. In this paper, an efficient gait recognition method based on describing subject outer body contour deformations using wavelet packets is proposed. With the use of matching pursuit algorithm, k bases of wavelet packet tree that have maximum similarity to the signal are selected and corresponding coefficients are used as features. Finally, transductive support vector machine (TSVM) classification is utilized on computed eigengait space for semi-supervised identification. The proposed method of selecting features which uses a complete orthogonal or near orthogonal basis from a wavelet packet library of bases and investigating the correlational structure of gait features for each individual using TSVM, result in encouraging identification performance.

关键词： Wavelet packets Support vector machines Matching pursuit algorithms Biometrics Humans Machine intelligence Surveillance Pursuit algorithms Support vector machine classification Libraries

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A new method for characterization of coronary plaque composition via IVUS images

A new method for characterization of coronary plaque composi...

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IEEE International Symposium on Biomedical Imaging

作者： Arash Taki Alireza Roodaki Olivier Pauly S. K. Setarehdan Gozde Unal Nassir Navab Department of Computer Aided Medical Procedures (CAMP) Technical University Munich Munich Germany Department of Signal Processing and Electronic Systems Supelec Gif-sur-Yvette France Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering College of Engineering University of Tehran Tehran Iran Faculty of Engineering and Natural Sciences Sabanci University Turkey

ISBN: (纸本)9781424439317

IVUS-derived virtual histology (VH) permits the assessment of atherosclerotic plaque morphology by using radiofrequency analysis of ultrasound signals. However, it requires the acquisition to be ECG-gated, which is a major limitation of VH. Indeed, its computation can only be performed once per cardiac cycle, which significantly decreases the longitudinal resolution of VH. To overcome this limitation, the introduction of an image-based plaque characterization is of great importance. Current IVUS image processing techniques do not allow adequate identification of the coronary artery plaques. This can be improved by defining appropriate features for the different kinds of plaques. In this paper, a novel feature extraction method based on Run-length algorithm is presented and used for improving the automated characterization of the plaques within the IVUS images. The proposed feature extraction method is applied to 200 IVUS images obtained from five patients. As a result an accuracy rate of 77% was achieved. Comparing this to the accuracy rates of 75% and 71% obtained using co-occurrence and local binary pattern methods respectively indicates the superior performance of the proposed feature extraction method.

关键词： Feature extraction Gray-scale Biomedical engineering Radio frequency Image resolution Signal processing Signal analysis Ultrasonic imaging Signal resolution Arteries

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Optimization of quantum interferometric metrological sensors in the presence of photon loss

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Physical Review A 2009年第6期80卷 063803-063803页

作者： Tae-Woo Lee Sean D. Huver Hwang Lee Lev Kaplan Steven B. McCracken Changjun Min Dmitry B. Uskov Christoph F. Wildfeuer Georgios Veronis Jonathan P. Dowling Center for Computation and Technology Louisiana State University Baton Rouge Louisiana 70803 USA Hearne Institute for Theoretical Physics Department of Physics and Astronomy Louisiana State University Baton Rouge Louisiana 70803 USA Department of Physics Tulane University New Orleans Louisiana 70118 USA Department of Electrical and Computer Engineering Louisiana State University Baton Rouge Louisiana 70803 USA

We optimize two-mode entangled number states of light in the presence of loss in order to maximize the extraction of the available phase information in an interferometer. Our approach optimizes over the entire available input Hilbert space with no constraints, other than fixed total initial photon number. We optimize to maximize the Fisher information, which is equivalent to minimizing the phase uncertainty. We find that in the limit of zero loss, the optimal state is the maximally path-entangled (so-called N00N) state, for small loss, the optimal state gradually deviates from the N00N state, and in the limit of large loss, the optimal state converges to a generalized two-mode coherent state, with a finite total number of photons. The results provide a general protocol for optimizing the performance of a quantum optical interferometer in the presence of photon loss, with applications to quantum imaging, metrology, sensing, and information processing.

关键词： Interferometers

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Approximation-Based Adaptive Tracking control of Pure-Feedback Nonlinear Systems with Multiple Unknown Time-Varying Delays

Approximation-Based Adaptive Tracking Control of Pure-Feedba...

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Joint 48th IEEE Conference on Decision and control and 28th Chinese control Conference

作者： Min Wang Shuzhi Sam Ge College of Automation and the Center for Control and Optimization South China University of Technology the Institute of Intelligent Systems and Information Technology University of Electronic Science and Technology of China the Department of Electrical and Computer Engineering National University of Singapore

This paper presents adaptive neural tracking control for a class of non-affine pure-feedback systems with multiple unknown state time-varying delays. The separation technique is introduced to decompose unknown functions of all time-varying delayed states into a series of continuous functions of each delayed state. A novel Lyapunov-Krasovskii functional is employed to compensate for the unknown function of current delayed state, which is effectively free from any restrictive assumption on unknown time-delay functions. The proposed control scheme guarantees the boundedness of all the signals in the closed-loop system and the tracking *** studies are provided to demonstrate the effectiveness of the proposed scheme.

关键词： Lyapunov Approximation-Based Adaptive Tracking control of Pure-Feedback Nonlinear Systems with Multiple Unknown Time-Varying Delays

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Fuzzy Logic control Application to Enhance Voltage Stability of the Electric Power Systems

Fuzzy Logic Control Application to Enhance Voltage Stability...

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International Conference on Intelligent Systems Applications to Power Systems (ISAP)

作者： James A. Momoh Wenjie Zheng Keisha D'Arnaud Center for Energy Systems and Control (CESaC) and Department of Electrical and Computer Engineering (ECE) Howard University College of Medicine Washington D.C. DC USA Center for Energy Systems and Control CESaC Howard University College of Medicine Washington D.C. DC USA

This paper develops an integrated strategy for maintaining voltage stability for online applications. The proposed strategy employs real time data in the computation of a voltage stability index for voltage stability monitoring and control. The index chosen allows for the fast evaluation of the voltage stability margin for real-time assessment. A fast control operation based on fuzzy logic control is used to determine the VAr compensation required for the mitigation of occurrences of voltage instability.

关键词： Fuzzy logic Voltage control control systems Power system stability Phasor measurement units Power system planning Power system control Monitoring Power system security Power systems

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Optimization of maintenance for power system equipment using a predictive health model

Optimization of maintenance for power system equipment using...

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Power Tech Conference

作者： G. Bajracharya T. Koltunowicz R. R. Negenborn Z. Papp D. Djairam B. De Schutter J. J. Smit Faculty of Electrical Engineering Mathematics and Computer Science Department High-voltage Components and Power Systems Delft University of Technnology Delft Netherlands Delft Center of Systems and Control Delft University of Technnology Delft Netherlands TNO Science and Industry Delft Netherlands Faculty of Electrical Engineering Mathematics and Computer Science Department High-voltage Components and Power Systems Transport Technology Department Delft University of Technnology Delft Netherlands

In this paper, a model-predictive control based framework is proposed for modeling and optimization of the health state of power system equipment. In the framework, a predictive health model is proposed that predicts the health state of the equipment based on its usage and maintenance actions. Based on the health state, the failure rate of the equipment can be estimated. We propose to use this predictive health model to predict the effects of different maintenance actions. The effects of maintenance actions over a future time window are evaluated by a cost function. The maintenance actions are optimized using this cost function. The proposed framework is applied in the optimization of the loading of transformers based on the thermal degradation of the paper insulation.

关键词： Power system modeling Predictive models Aging Cost function Marine technology Power transformer insulation Predictive maintenance Power system management Investments Power system reliability

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Designing a home security system using sensor data fusion with dst and dsmt methods

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International Journal of engineering, Transactions A: Basics 2009年第1期22卷 13-20页

作者： Khalkhali, A. Moussavi Moshiri, B. Momeni, H.R. Telecommunication Infrastructure Company of Iran Ministry of Information and Communication Technology P.O. Box 14115-143 Tehran Iran Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran P.O. Box 14395-515 Tehran Iran Department of Electrical Engineering Tarbiat Modarres University P.O. Box 14115-143 Tehran Iran

Today due to the importance and necessity of implementing security systems in homes and other buildings, systems with higher certainty, lower cost and with sensor fusion methods are more attractive, as an applicable and high performance methods for the researchers. In this paper, the application of Dempster-Shafer evidential theory and also the newer, more general one Dezert-Smarandache theory for implementing as a home security system and also using sensor data fusion have been considered. The benefits of multisensor fusion with direct connection to the control unit, in comparison with the traditional single sensor systems, have been shown.

关键词： Sensor data fusion

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Properties of the Parametric Lyapunov Equation Based Low Gain Design with Applications in Stabilization of Time-Delay Systems

Properties of the Parametric Lyapunov Equation Based Low Gai...

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2009 American control Conference (ACC 2009)

作者： Bin Zhou Zongli Lin Guangren Duan Center for Control Theory and Guidance Technology Harbin Institute of Technology Harbin 150001 PR China Charles L. Brown Department of Electrical and Computer Engineering University of Virginia Charlottesville VA 22904-4743 U.S.A.

ISBN: (纸本)9781424445233

This paper studies some properties of the recently developed parametric Lyapunov equation based low gain feedback design method. As applications of these new properties, alternative and simpler solutions are proposed to the (global) stabilization problem for a class of linear systems with input delay and the semi-global stabilization problem when the systems are in addition subject to actuator saturation. Besides the simplicity in their construction, the new solutions can also be easily scheduled online to achieve global result in the presence of input saturation.

关键词： Linear systems control systems Delay systems Hydraulic actuators Delay estimation Riccati equations Nonlinear equations Lyapunov method Output feedback Design methodology

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Fractional-order memristive systems

Fractional-order memristive systems

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Ivo Petráš YangQuan Chen Calvin Coopmans Institute of Control and Informatization of Production Processes BERG Faculty Technical University of Košice Kosice Slovakia Center for Self-Organizing and Intelligent Systems (CSOIS) Electrical and Computer Engineering Department Utah State University Logan UT USA

This paper deals with the concept of (integer-order) memristive systems, which are generalized to non-integer order case using fractional calculus. We consider the memory effect of the fractional inductor (fractductor), fractional capacitor and fractional memristor. We also show that the memory effect of such devices can be also used for an analogue implementation of the fractional-order operator, namely fractional-order integral and fractional-order derivatives. This kind of operator is useful for realization of the fractional-order controllers. We present theoretical description of such implementation and we proposed the practical realization and did some simulations and experimental measurements as well.

关键词： Memristors Fractional calculus Inductors Capacitors Voltage Circuit simulation Resistors Temperature Phase change memory control systems

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