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2013 20th Iranian Conference on Biomedical engineering, ICBME 2013

作者： Turani, Zahra Zoroofi, Reza A. Shirani, Shapoor Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Tehran 14395/515 Iran Department of Radiology School of Medicine Tehran University of Medical Science Tehran Iran

ISBN: (纸本)9781479932320

Nowadays one of the most important causes of mortality is cardiovascular disease, especially coronary artery stenosis. Therefore, it is important to find an accurate and fast way to diagnose them. Computed tomography angiography is a non-invasive imaging method for the heart and its vessel, which can be used instead of angiography in many cases. Indeed, the main focus is on developing an automatic method which can be as accurate as angiography with the least user's contribution. Automatic coronary artery segmentation is considered as the first step to reach this goal. Therefore, a hierarchical region growing algorithm is proposed in which the whole heart region vessels, aorta, left ventricle and other cardiovascular vessels are segmented for the purpose of coronary artery segmentation. Our method validation is assessed by a radiologist through comparing the results with manual segmentation of him. Proposed method's results are 86.81% in average similar to radiologist's segmentation in kappa statistic and its label consistency with radiologist's segmentation is 90.23%. Comparing to other methods, our method is automatic and both left and right coronary can be segmented in all data-sets. It also segments important branches of coronary artery. According to the radiologist comments and high similarity measure, proposed method is reliable and applicable. © 2013 IEEE.

关键词： Heart

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Toward Combining Intra-Real Time Dispatch (RTD) and AGC for On-Line Power Balancing

Toward Combining Intra-Real Time Dispatch (RTD) and AGC for ...

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IEEE Power and Energy Society General Meeting

作者： Marija D. Ilic Xiaoqi Yin Qixing Liu Yang Weng Dept. of Elec. & Comp. Eng. Carnegie Mellon University Pittsburgh Pennsylvania 15213 Dept. of Elec. & Comp. Eng. Carnegie Mellon University Pittsburgh Pennsylvania China Southern Power Grid Power Dispatching and Control Center Guangzhou Guangdong P.R. China Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh Pennsylvania

In this paper we propose first a predictive adaptive intra-RTD dispatch comprising: (1) Intra-RTD non-zero mean predictor which utilizes historic data about various uncertainties to predict the most likely non-zero mean imbalances;and, (2) Adaptive controller for non-zero mean intra-RTD imbalances using two-stage robust optimization. The result of applying these methods sequentially at the beginning of each RTD interval is the least-cost robust adaptation of RTD schedules in anticipation of the most likely non-zero mean imbalances. We illustrate how this proposed predictive adaptive intra-RTD dispatch can be implemented for a typical hour. Second, only hard-to-predict near-zero-mean imbalances are compensated using Automatic Generation control (AGC). The basic conclusion is that a combination of predictive adaptive intra-RTD and recently proposed Enhanced-AGC (E-AGC) should be used for the least cost on-line balancing of non-zero mean and zero mean imbalances, respectively.

关键词： Generators Schedules Power generation Rotors Silicon Power measurement Uncertainty

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A centralized potential field method for stable operation of a multi-robot dome inspection, repair, and maintenance system

A centralized potential field method for stable operation of...

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RSI/ISM International Conference on Robotics and Mechatronics (ICROM)

作者： K. Naderi A. Nejadfard H. Moradi M. Nili Ahmadabadi School of Electrical and Computer Engineering University of Tehran Iran Control and Intelligent Processing Center of Excellence at the Electrical and Computer Engineering Department University of Tehran Iran

In this paper we propose a centralized algorithm for stable operation of a multi-robot dome inspection, repair, and maintenance based on potential field method. The multi-robot system consists of two robots, a leader robot and a supporter robot, connected to each other by two strings. The follower robot sends its information to the leader robot for processing and receiving commands. The leader robot uses the friction model, the slope of the dome detected by the two robots' tilt sensors and the mass of the robots to calculate the stability ranges and determines the proper action to make the whole system stable. The leader robot moves toward its target pose while adjusting the tension of its string using potential field method to combine the attractive and repulsive potentials. The follower robot executes the commands sent by the leader robot to create the most stable configuration for the whole system. It is shown that the algorithm can guarantee stable operation all over a typical dome. The algorithm has been implemented and shown its effectiveness in simulation. Furthermore, the effect of each parameter has been discussed and it is shown that the multi-robot system is capable of completely covering a typical dome using the proposed potential field algorithm.

关键词： Robot sensing systems Lead Maintenance engineering Radio frequency Force Service robots

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Tuning and experimental evaluation of a likelihood-based engine knock controller

Tuning and experimental evaluation of a likelihood-based eng...

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52nd IEEE Conference on Decision and control, CDC 2013

作者： Thomasson, Andreas Eriksson, Lars Lindell, Tobias Peyton Jones, James C. Spelina, Jill Frey, Jesse Division of Vehicular Systems Department of Electrical Engineering Linkoping University Linkoping SE-581 83 Sweden Center for Nonlinear Dynamics and Control Department of Electrical and Computer Engineering Villanova University Villanova PA 19085 United States Center for Nonlinear Dynamics and Control Villanova University Villanova PA 19085 United States Science Technology Engineering and Mathematics Division Delaware County Community College Media PA 19063 United States Department of Mathematics and Statistics Villanova University Villanova PA 19085 United States

ISBN: (纸本)9781467357173

A new likelihood-based stochastic knock controller, that achieves a significantly improved regulatory response relative to conventional strategies, while also maintaining a rapid transient response is presented. Up until now it has only been evaluated using simulations and the main contribution here is the implementation and validation of the knock controller on a five cylinder engine with variable compression ratio. Furthermore, an extension of the fast response strategy and a re-tuning of the controller is shown to improve performance. The controller is validated with respect to its robustness to changes in engine operating condition as well as compression ratio. The likelihood-based controller is demonstrated in engine tests and compared to a conventional controller and it is shown that it is able to operate closer to the knock limit with less variations in control action without increasing the risk of engine damage. © 2013 IEEE.

关键词： controllers

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Voltage Stabilization in Microgrids via Quadratic Droop control

Voltage Stabilization in Microgrids via Quadratic Droop Cont...

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IEEE Annual Conference on Decision and control

作者： John W. Simpson-Porco Florian Dorfler Francesco Bullo Center for Control Dynamical Systems and Computation University of California Santa Barbara Department of Electrical Engineering University of California Los Angeles

ISBN: (纸本)9781467357159

Motivated by the growing interest in energy technology and smart grid architectures, we consider the problem of voltage stability and reactive power balancing in low-voltage electrical networks equipped with DC/AC inverters ("microgrids"). It is generally believed that high-voltage equilibria of such networks are stable, but the locations of these equilibria are unknown, as is the critical network load where stability is lost. Inspired by the "control by interconnection" paradigm developed for port-Hamiltonian systems, we propose a novel droop-like inverter controller which is quadratic in the local voltage magnitude. Remarkably, under this controller the closed-loop network is again a well-posed electrical circuit. We find that the equilibria of the quadratic droop-controlled network are in exact correspondence with the solutions of a reduced power flow equation. For general network topologies, we study some simple yet insightful solutions of this equation, and for the frequently-encountered case of a parallel microgrid, we present a concise and closed-form condition for the existence of an exponentially stable high-voltage network equilibrium. Our condition establishes the existence of a critical inductive load for the network, which depends only on the network topology, admittances, and controller gains. We compare and contrast our design with the conventional droop controller, investigate the relationship between the two, and validate the robustness of our design through simulation.

关键词： Inverters Microgrids Equations Voltage control Mathematical model Vectors Reactive power

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Active disturbance rejection control on path following for underactuated ships

Active disturbance rejection control on path following for u...

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10th International Symposium on Neural Networks, ISNN 2013

作者： Li, Ronghui Li, Tieshan Zheng, Qingling Gao, Xiaori Navigation College of Dalian Maritime University No.1 Linghai Road 116026 Dalian China Center of Advanced Control Technologies Department of Electrical Computer Engineering Cleveland State University Cleveland OH United States

ISBN: (纸本)9783642390678

To solve the path following problem of underactuated surface ships with internal dynamic uncertainties and external disturbances, an Active-Disturbance-Rejection control (ADRC) controller is introduced to steer the ship to follow the desired path. Drift angle compensation is added to the controller by designing a coordinate transformation equation. The cross track static error caused by wind and current is overcome. Simulations were carried out on a fully nonlinear hydrodynamic model of a training ship to validate the stability and excellent robustness of the proposed controller. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： controllers

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A New Evolutionary-Incremental Framework for Feature Selection

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Advances in Artificial Intelligence 2014年第1期2014卷

作者： Mohamad-Hoseyn Sigari Muhammad-Reza Pourshahabi Hamid-Reza Pourreza Machine Vision Research Lab. Computer Engineering Department Ferdowsi University of Mashhad Mashhad 91779 Iranum.ac.ir Control and Intelligent Processing Center of Excellence (CIPCE) School of Electrical and Computer Engineering College of Engineering University of Tehran Tehran 14399 Iranut.ac.ir

Feature selection is an NP-hard problem from the viewpoint of algorithm design and it is one of the main open problems in pattern recognition. In this paper, we propose a new evolutionary-incremental framework for feature selection. The proposed framework can be applied on an ordinary evolutionary algorithm (EA) such as genetic algorithm (GA) or invasive weed optimization (IWO). This framework proposes some generic modifications on ordinary EAs to be compatible with the variable length of solutions. In this framework, the solutions related to the primary generations have short length. Then, the length of solutions may be increased through generations gradually. In addition, our evolutionary-incremental framework deploys two new operators called addition and deletion operators which change the length of solutions randomly. For evaluation of the proposed framework, we use that for feature selection in the application of face recognition. In this regard, we applied our feature selection method on a robust face recognition algorithm which is based on the extraction of Gabor coefficients. Experimental results show that our proposed evolutionary-incremental framework can select a few number of features from existing thousands features efficiently. Comparison result of the proposed methods with the previous methods shows that our framework is comprehensive, robust, and well-defined to apply on many EAs for feature selection.

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Tracking attention based on EEG spectrum

Tracking attention based on EEG spectrum

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15th International Conference on Human-computer Interaction, HCI International 2013

作者： Wang, Yu-Kai Jung, Tzyy-Ping Chen, Shi-An Huang, Chin-Sheng Lin, Chin-Teng Brain Research Center National Chioa Tung University Hsinchu Taiwan Department of Computer Science National Chiao Tung University Hsinchu Taiwan Department of Electrical Engineering National Chiao Tung University Hsinchu Taiwan Swartz Center for Computational Neruoscience Institute for Neural Computation University of Callifornia San Diego San Diego CA United States

ISBN: (纸本)9783642394720

Distraction while driving is a serious problem that can have many catastrophic consequences. Developing a countermeasure to detect the drivers' distraction is imperative. This study measured Electroencephalography (EEG) signals from six healthy participants while they were asked to pay their full attention to a lane-keeping driving task or a math problem-solving task. The time courses of six distinct brain networks (Frontal, Central, Parietal, Occipital, Left Motor, and Right Motor) separated by Independent Component Analysis were used to build the distraction-detection model. EEG data were segmented into 400-ms epochs. Across subjects, 80% of the EEG epochs were used to train various classifiers that were tested against the remaining 20% of the data. The classification performance based on support vector machines (SVM) with a radial basis function (RBF) kernel achieved accuracy of 84.7±2.7% or 85.8±1.3% for detecting subjects' focuses of attention to the math-solving or lane-deviation task, respectively. The high attention-detection accuracy demonstrated the feasibility of accurately detecting drivers' attention based on the brain activities. This demonstration may lead to a practical real-time distraction-detection system for improving road safety. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Electroencephalography

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Continuous-variable quantum key distribution with entanglement in the middle

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Physical Review A 2013年第2期87卷 022308-022308页

作者： Christian Weedbrook Center for Quantum Information and Quantum Control Department of Electrical and Computer Engineering University of Toronto Toronto ON M5S 3G4 Canada

We analyze the performance of continuous-variable quantum key distribution protocols where the entangled source originates not from one of the trusted parties, Alice or Bob, but from the malicious eavesdropper in the middle. This is in contrast to the typical simulations where Alice creates the entangled source and sends it over an insecure quantum channel to Bob. By using previous techniques and identifying certain error-correction-protocol equivalences, we show that Alice and Bob do not need to trust their source and can still generate a positive key rate. Such a situation can occur in a quantum network where the untrusted source originated in between the two users.

关键词： Quantum entanglement

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Randomized sampling for large zero-sum games

Randomized sampling for large zero-sum games

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作者： Bopardikar, Shaunak D. Borri, Alessandro Hespanha, João P. Prandini, Maria Di Benedetto, Maria D. United Technologies Research Center Inc. Berkeley CA United States Rome Italy Center for Control Dynamical Systems and Computation University of California Santa Barbara CA 93106 United States Dipartimento di Elettronica Informazione e Bioingegneria Politecnico di Milano Italy Department of Electrical and Information Engineering University of l'Aquila Italy

This paper addresses the solution of large zero-sum matrix games using randomized methods. We formalize a procedure, termed as the sampled security policy (SSP) algorithm, by which a player can compute policies that, with a high confidence, are security policies against an adversary using randomized methods to explore the possible outcomes of the game. The SSP algorithm essentially consists of solving a stochastically sampled subgame that is much smaller than the original game. We also propose a randomized algorithm, termed as the sampled security value (SSV) algorithm, which computes a high-confidence security-level (i.e., worst-case outcome) for a given policy, which may or may not have been obtained using the SSP algorithm. For both the SSP and the SSV algorithms we provide results to determine how many samples are needed to guarantee a desired level of confidence. We start by providing results when the two players sample policies with the same distribution and subsequently extend these results to the case of mismatched distributions. We demonstrate the usefulness of these results in a hide-and-seek game that exhibits exponential complexity. © 2013 Elsevier Ltd. All rights reserved.

关键词： Game theory

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