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Switching Control in DC-DC Converter Circuits: Optimizing Tracking-Energy Tradeoffs

IFAC Proceedings Volumes 2012年第9期45卷 198-203页

作者： H. Kawashima Y. Wardi D. Taylor M. Egerstedt The Graduate School of Informatics Kyoto University Kyoto Japan School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta USA

This paper concerns the problem of optimal switching control in voltage converter circuits, where the objective is to minimize a cost-performance function comprised of the sum of a tracking-related measure and the switching energy. Most of the existing approaches to optimal switching are based on continuous-parameter optimization and optimal control techniques, which are mostly suitable to continuous-parameter functions such as tracking-related performance metrics. On the other hand, the switching-energy cost performance is inherently a discontinuous function dependent on the number of switchings, and hence its inclusion in the problem often is done in ad-hoc ways. This paper explores a systematic approach to optimizing performance - energy tradeoffs by extending an algorithm for optimizing tracking, developed by the authors, to include the energy performance via an averaging technique. The problem is posed in the setting of Pulse Width Modulation, and the controlled variables are the cycle time and duty ratios at each cycle. Extensive simulation results suggest the potential generality of the proposed approach.

关键词： Switched-mode hybrid systems gradient-descent algorithms voltage-converter circuits

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An image splicing detection based on interpolation analysis

An image splicing detection based on interpolation analysis

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13th Pacific-Rim Conference on Multimedia, PCM 2012

作者： Ciptasari, Rimba W. Rhee, Kyung-Hyune Sakurai, Kouichi Graduate School of Information Science and Electrical Engineering Department of Informatics Kyushu University Fukuoka Japan Faculty of Informatics Telkom Institute of Technology Bandung Indonesia Department of IT Convergence and Application Engineering Pukyong National University 599-1 Daeyeon 3-Dong Nam-Gu Busan 608-737 Korea Republic of

ISBN: (纸本)9783642347771

With the advent of low-cost and high-resolution digital cameras and sophisticated editing software, it is becoming increasingly easier to tamper with the digital image. A common form of manipulation is to combine parts of the image fragment into another different image to remove objects from the image. Inspired by the digital image correlation concept, we exploit the peak of cross-correlation function to automatically detect the splicing artifacts in any fragment of an image. We show the efficacy of the proposed scheme on revealing the source of spliced regions. We make the first concrete technique towards appropriate tools which are necessary for rendering digital forgeries. © 2012 Springer-Verlag.

关键词： Edge detection

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Optimal Control of Switched Systems: The Case of a Step-Down DC-DC Converter

Optimal Control of Switched Systems: The Case of a Step-Down...

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IEEE Convention of electrical and Electronics Engineers in Israel

作者： H. Kawashima Y. Wardi D. Taylor M. Egerstedt Graduate School of Informatics Kyoto University School of Electrical and Computer Engineering Georgia Institute of Technology

ISBN: (纸本)9781467346825

In the past few years we have developed an algorithmic framework for optimal control of switched-mode hybrid dynamical systems. Such systems are described by the equation x = f(x, v), (1) where x ∈ R~n, x_0 : = x(0) is given, v belongs to a finite set V (is contained in) R, and f : R~n × V → R~n is a function that is continuously differentiable in x for every v ∈ V. Let L : R~n → R be a function, and consider the cost functional J, defined as J = ∫_0~(t_f) L(x(t))dt, (2) for a given final time t_f > 0. The problem that we consider is to minimize J.

关键词： DC converter Optimal control radon Continuously differentiable iodine Switched systems Vanadium DC to DC converters

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Smart antenna using a combination of D3LS and NCLS algorithms

Smart antenna using a combination of D3LS and NCLS algorithm...

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2012 9th International Conference on electrical engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON 2012

作者： Nilsuwan, Phichet Boonpoonga, Akkarat Tagapanij, Jukkrit Sirisuk, Phaophak Electrical Engineering Graduate Program Faculty of Engineering Mahanakorn University of Technology Bangkok Thailand Department of Electrical and Computer Engineering Faculty of Engineering King Mongkut's University of Technology North Bangkok Bangkok Thailand Department of Telecommunication Engineering Mahanakorn University of Technology Bangkok Thailand International College King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand

ISBN: (纸本)9781467320245

This paper presents a smart antenna system using a combination of nonconventional least square (NCLS) optimization and direct data domain least square (D3LS) for direction-of-arrival (DOA) estimation and beamforming, respectively. In the proposed system, NCLS optimization is utilized to estimate DOA of incoming signal first. The estimated DOA is then assisted for initial processing of D3LS in beamforming. The performance in term of estimated signal amplitude and estimated DOA of the proposed system is evaluated via simulations. © 2012 IEEE.

关键词： Direction of arrival

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Performance evaluation of D3LS and NCLS smart antenna in mobile communications

Performance evaluation of D3LS and NCLS smart antenna in mob...

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2012 17th International Symposium on Antennas and Propagation, ISAP 2012

作者： Boonpoonga, Akkarat Nilsuwan, Phichet Tagapanij, Jukkrit Sirisuk, Phaophak Department of Electrical and Computer Engineering Faculty of Engineering King Mongkut's University of Technology North Bangkok Bangkok Thailand Electrical Engineering Graduate Program Faculty of Engineering Mahanakorn University of Technology Bangkok Thailand Department of Telecommunication Engineering Mahanakorn University of Technology Bangkok Thailand International College King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand

ISBN: (纸本)9784885522703

A smart antenna was proposed to improve wireless communication systems. The smart antenna may comprises direction-of-arrival (DOA) estimation and/or adaptive antenna. The DOA estimation technique is used to estimate direction of transmitted signals. An adaptive antenna has ability of suppressing undesired signals namely interference or jammers in specific directions while receive only the desired one. There are a number of methods proposed to conduct in such way, including multiple signal classification (MUSIC), least mean squares (LMS), sample matrix inversion (SMI), recursive least squares (RLS), and their derivative forms as seen in the literatures in [1]. These methods require a training sequence or known information for adaptation and/or DOA estimation. Although a constant modulus algorithm (CMA) was proposed without the need of training sequence, it has a slow convergence. © 2012 IEICE.

关键词： Multiple signal classification

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Fault detection with optimum March test algorithm

Fault detection with optimum March test algorithm

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3rd International Conference on Intelligent Systems Modelling and Simulation, ISMS 2012

作者： Zakaria, Nor Azura Hasan, W.Z.W. Halin, I.A. Sidek, R.M. Wen, Xiaoqing MIMOS Berhad Microelectronic Department Technology Park Malaysia Bukit Jalil 57000 Kuala Lumpur Malaysia Department of Electrical and Electronic Engineering Faculty Engineering University Putra Malaysia Serdang Selangor Malaysia Department of Creative Informatics Graduate School of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Japan

ISBN: (纸本)9780769546681

Integrating a large number of embedded memories in System-on-Chips (SoC's) occupies up to more than 70% of the die size, thus requiring Built-In Self-Test (BIST) with the smallest possible area overhead. This paper analyzes MATS++(6N), March C-(10N), March SR(14N), and March CL(12N) test algorithms and shows that they cannot detect either Write Disturb Faults (WDFs) or Deceptive Read Destructive Faults (DRDFs) or both. Therefore to improve fault detection, an automation program is developed based on sequence operation (SQ) generation rules. However after solving the undetected fault, the outcome in term of its detection result of Static Double Cell Faults using the specified test algorithm especially Transition Coupling Faults (CFtrs), Write Destructive Coupling Faults (CFwds), Read Destructive Coupling Faults (CFrds) and Deceptive Read Destructive Faults (CFdrds) are observed. © 2012 IEEE.

关键词： Fault detection

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Polarity estimation of tweets by feature sets

Polarity estimation of tweets by feature sets

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25th International Conference on Computer Applications in Industry and engineering, CAINE 2012 and the 4th International Symposium on Sensor Network and Application, SNA 2012

作者： Sakai, Toshihiko Hashimoto, Kiyota Kamisoyama, Yuya Okada, Makoto Hirokawa, Sachio Graduate School of Information Science and Electrical Engineering Kyushu University Kyushu Japan School of Humanities and Social Sciences Osaka Prefecture University Osaka Prefecture Japan Graduate School of Informatics Shizuoka University Shizuoka Japan Graduate School of Science Osaka Prefecture University Osaka Prefecture Japan Research Institute for Information Technology Kyushu University Kyushu Japan

ISBN: (纸本)9781880843888

Sentiment analysis of micro-blogs, such as twitter, is one of the hottest topics. The speed of information propagation is becoming faster and faster. We cannot control the flow of information on tweets. So, we need to know the characteristics of such communication tools. The present paper extracts the features of emotional tweets, based on feature selection by SVM. An attention is paid to part of speech, particularly to the particles. Copyright © 2012 by International Society of Computers and Their Applications (ISCA).

关键词： Sentiment analysis

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Leader Selection via the Manipulability of Leader-Follower Networks

Leader Selection via the Manipulability of Leader-Follower N...

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American Control Conference

作者： Hiroaki Kawashima Magnus Egerstedt Graduate School of Informatics Kyoto University Japan School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30308 USA

ISBN: (纸本)9781457710957

In this paper, we address the problem of selecting leaders in a network by investigating how much instantaneous impact the leaders have on the remaining agents. As a measurement of the influence of leaders' inputs, we exploit the notion of manipulability, which is recently developed for leader-follower networks driven by a state-dependent weighted consensus equation. This paper first extends the manipulability index in order to measure the influence of leaders' inputs on the network centroid. We then demonstrate in simulation how the manipulability index is suitable for selecting effective leaders.

关键词： Approximation methods Radio frequency Lead Indexes Vectors Protocols Network topology

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Compensation of a transmitter's radiation pattern for synthetic transmit aperture acoustic imaging

Compensation of a transmitter's radiation pattern for synthe...

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2012 IEEE International Conference on Imaging Systems and Techniques, IST 2012

作者： Laokulrat, Natsuda Maeda, Yasushige Sugimoto, Masanori Hashizume, Hiromichi Department of Electrical Engineering and Information Systems School of Engineering University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo Japan Department of Informatics School of Multidisciplinary Sciences Graduate University for Advanced Studies 2-1-2 Hitotsubashi Chiyoda-ku Tokyo Japan Information Systems Architecture Research Division National Institute of Informatics 2-1-2 Hitotsubashi Chiyoda-ku Tokyo Japan

ISBN: (纸本)9781457717741

In an acoustic imaging system, ultrasonic transmitters always have uneven signal strength in the imaging space. Phase changes also occur depending on the distance and direction. In this paper, a new approach to decrease the effect of a transmitter's radiation pattern in acoustic imaging is proposed. We compensated for the transmitter's radiation pattern and reconstructed acoustic images using the Synthetic Transmit Aperture imaging technique. The compensation was based on the radiation pattern obtained from real measurements and using a Wiener filter. The purpose of the work was to compensate for a nonideal radiation pattern of the ultrasonic transmitter for both phase and amplitude aspects. An airborne imaging experiment was conducted using a two-dimensional (2D) receiver array and a 2D transmitter array to verify the effectiveness of our proposed method. The results showed an improvement in the vertical angular resolution of reconstructed three-dimensional images. © 2012 IEEE.

关键词： Transmitters

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PRODUCTION OF TUMOR NECROSIS FACTOR-ALPHA BY MICROGLIA IN RAT BRAIN AFTER TRAUMATIC BRAIN INJURY

PRODUCTION OF TUMOR NECROSIS FACTOR-ALPHA BY MICROGLIA IN RA...

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第九届海峡两岸心血管科学研讨会暨首届台湾南部国际心脑血管科学研讨会

作者： Che-Chuan Wang Chung-Zhing Yang Bor-Chih Cheng Cheng-Kuei Chang Ming-Wen Chang Bi-Ying Chio Jung-Sheng Yu Chung-Ching Chio Ching-Ping Chang Department of Surgery Chi Mei Medical Center Tainan Taiwan Graduate Institute of Injury Prevention and Control Taipei Medical University and Municipal Wan-Fan Hospital Taipei Taiwan Department of Electrical Engineering National Cheng Kung University Tainan Taiwan Department of Chinese Medicine Chi Mei Medical Center Tainan Taiwan Department of Child Care Southern Taiwan University of Science and Technology Tainan Taiwan The Program for Cancer Biology and Drug Discovery (CBDD) Taipei Medical University Taipei Taiwan Department of Biotechnology Southern Taiwan University of Science and Technology Tainan Taiwan

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