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Force tracking system using a semi-active valve lag damper for vibration reduction in helicopters

Force tracking system using a semi-active valve lag damper f...

引用

UKACC International Conference on control 2010

作者： Morales, Rafael M. Turner, Matthew C. Postlethwaite, Ian Control and Instrumentation Research Group Dept. of Engineering University of Leicester University Rd. Leicester LE1 7RH United Kingdom Northumbria University United Kingdom

ISBN: (纸本)9781846000386

This paper considers a closed-loop force tracking system for an active valve lag damper intended for vibration reduction applications in helicopters. The mathematical model of the damper is treated in a simplified form and is the basis for controller design. Due to the inherent nonlinearity of the damper, a controller is constructed using concepts from nonlinear control, namely, nonlinear dynamic inversion (NDI). Tuning methods according to several frequency-domain requirements are introduced and a realistic simulation example demonstrates the effectiveness of the controller.

关键词： controllers

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A nature-inspired evolutionary algorithm based on spiral movements

A nature-inspired evolutionary algorithm based on spiral mov...

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作者： Jin, Gang-Gyoo Tran, Thanh-Do Division of Information Technology Korea Maritime University Busan 606-791 Korea Republic of Dept. of Control and Instrumentation Engineering Korea Maritime University Busan 606-791 Korea Republic of

ISBN: (纸本)9784907764364

In this paper, we present a nature-inspired evolutionary algorithm which is capable of solving real-valued optimization problems. The novel algorithm employs attraction and mutation. Attraction, based on the observation of spiral movements encountered in nature and the universe, is implemented using a dynamic system model. The proposed operator incorporating with the dynamic mutation works with the population-based technique to iteratively evolve into better and better solutions. To demonstrate its efficiency and accuracy, the proposed algorithm is evaluated on a variety of real-valued benchmark functions. © 2010 SICE.

关键词： Evolutionary algorithms

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Image Segmentation of UV Pattern for Automatic Paper-Money Inspection

Image Segmentation of UV Pattern for Automatic Paper-Money I...

引用

International Conference on control, Automation, robotics and Vision

作者： Keon-Ho Lee Tae-Hyoung Park Dept. of Control and Robot Engineering & CBITRC Chungbuk National University Cheong-ju Korea

ISBN: (纸本)9781424478149

We propose an image segmentation method for automatic paper-money inspection system. The UV (ultra violet) patterns embedded in the paper money should be segmented to determine whether the money is genuine or not. We acquired the image by directional lighting system using UV LEDs. In order to segment the pattern from the background, we apply the Gaussian mixture model to consider the multi-modal characteristics of the histogram. Experimental results are presented to verify the performance of the proposed method.

关键词： Paper money inspection Ultra violet(UV)) image Image segmentation Gaussian mixture model Expectation Maximization(EM) algorithm

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Energy-optimized secure remote fingerprint authentication in a mobile environment

Energy-optimized secure remote fingerprint authentication in...

引用

IEEE International Conference on Consumer Electronics (ICCE)

作者： Seungwoo Hong Sungju Lee Yongwha Chung Hakil Kim Sungbum Pan Human ID Research Team Electronics and Telecommunications Research Institute South Korea Human ID Research Team Dept. of Computer and Information Science Korea University South Korea Dept. of Computer and Information Science Korea University Dent. of Information and Communication Engineering Biometrics Engineering Research Center Inha University South Korea Dept. Control Instrumentation and Robot Engineering Chosun University South of Korea

ISBN: (纸本)9781424443147

To optimize the energy consumption during transmission in a secure remote fingerprint authentication system, most approaches have considered a fixed-rate compression of WSQ(Wavelet Scalar Quantization). To balance the energy consumption and the recognition accuracy, however, we need to consider the total energy consumption during compression/encryption/transmission and the quality of the given image. In this paper, we first develop an energy-accuracy prediction model. Then, from the given image, we can evaluate the quality of it. Finally, from the user's minimum requirement of the recognition accuracy, the energy-optimized compression rate under the requirement can be derived adaptively. Based on the experimental result, we show that total energy consumption of the fixed approach can be reduced by 29%.

关键词： Fingerprint recognition Authentication Image coding Image matching Energy consumption Handheld computers Cryptography Power engineering and energy Image recognition Biometrics

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H-bridge based Multilevel Inverter using PWM Switching Function

H-bridge based Multilevel Inverter using PWM Switching Funct...

引用

31st International Telecommunications Energy Conference (INTELEC 09)

作者： Choi, Won-Kyun Kang, Feel-soon Dept. of Control and Instrumentation Engineering Hanbat National University South Korea

ISBN: (纸本)9781424424900

This paper proposes an efficient PWM switching function for modified H-bridge based multilevel inverter. The prior H-bridge based multilevel inverter can increase the number of output voltage levels by adding switch components and dc input voltage sources. If it employs seven switches and three dc sources, the number of output voltage levels becomes seven. Although its THD characteristics are improved, it needs output filter to meet general output voltage THD requirement, i.e., 5% below. To mitigate this problem, we propose an efficient PWM switching method for the prior H-bridge based multilevel inverter. By adding PWM switching schemes to the operation of the prior H-bridge switches, it can synthesize more sinusoidal waveform. By this simple alteration in the switching scheme, it can improve the output voltage THD requirement. To verify the high performance of the proposed switching scheme, we implemented computer-aided simulations and experiment using a prototype.

关键词： Switching functions

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The surveillance system based on RFID system for privacy protection

The surveillance system based on RFID system for privacy pro...

引用

2009 2nd International Conference on Computer Science and Its Applications, CSA 2009

作者： Moon, Hae-Min Chae, Seung-Hoon Pan, Sung Bum Dept. of Information and Communications Engineering Chosun Univ. Gwangju Korea Republic of Dept. of Control Instrumentation and Robot Engineering Chosun Univ. Gwangju Korea Republic of

ISBN: (纸本)9781424449460

Due to increased terrors and crimes, the use of the surveillance system like CCTV is increasing. The surveillance system has been operated for public interest such as prevention of crimes and fly-tipping by the police and local government. However private information such as faces or behavior patterns can be recorded in CCTV, it may cause the invasion of privacy. This paper analyses conventional methods of privacy protection in surveillance camera systems. We propose a video surveillance system that satisfies both privacy protection and surveillance. The proposed system uses the RFID to recognize the human and uses the scrambling to prevent invasion of privacy. Note that the proposed system can reduce invasion of privacy by intensity of scrambling according to access levels. It is able to exactly offer internal or external personnel information of objects to the surveillance. Based on the experimental results, we confirm that the proposed system can be privacy protection and the surveillance. © 2009 IEEE.

关键词： Crime

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Implementation of the hybrid fingerprint verification

Implementation of the hybrid fingerprint verification

引用

2009 2nd International Conference on Computer Science and Its Applications, CSA 2009

作者： Chae, Seung-Hoon Lim, Sung Jin Chung, Yongwha Pan, Sung Bum Dept. of Information and Communication Engineering Chosun Univ. Gwangju Korea Republic of Dept. of Computer and Information Science Korea Univ. Sejong Campus Chungnam Korea Republic of Dept. of Control Instrumentation and Robot Engineering Chosun Univ. Gwangju Korea Republic of

ISBN: (纸本)9781424449460

In contemporary society, access to information is easy because of advanced communication media, so security system which prevent unauthorized access is considered important. Fingerprint verification systems are very convenient and secure. Minutiae-based fingerprint verification is widely used in fingerprint verification. However, existing systems can cause errors according to size and quality of fingerprint images that are read only with a use of minutiae. Due to such errors, the users who have no authority of access are allowed to use the information, which is a problem. This paper proposes hybrid fingerprint verification methods of two kinds to improve performance of minutiae-based fingerprint verification. One is method using fingerprint binary image, and another is method using ridge-information. The result which experiments two kind methods, we confirm to improved performance of fingerprint verification than when only minutiae-based verification was used. © 2009 IEEE.

关键词： Binary images

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Infrared-based face identification system via multithermal moment invariants distribution

Infrared-based face identification system via multithermal m...

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3rd International Conference on Signals, Circuits and Systems, SCS 2009

作者： Abas, Khairul Hamimah Ono, Osamu Dept. of Electronics and Bioinformatics School of Science and Engineering Meiji University Kanagawa Japan Dept. of Control and Instrumentation Engineering Fac. of Electrical Engineering UTM Johor Malaysia

ISBN: (纸本)9781424443987

This paper presents the implementation of moment invariants in an infrared-based face identification system to develop a novel and less complicated face identification system in thermal spectrum. Initially the system decomposes an infrared image into 4 thermal regions via 3-valued threshold method. In order to increase the information obtained from each decomposed IR image, the first four of the classical Hu's moment invariants were computed from each generated thermal regions. Additional to this, centroid point and area (in pixel) were also obtained from each generated thermal region. The acquired Hu's moment invariants together with the acquired centroid point and area (in pixel) forms a string of features for classification/identification. This system employs a hierarchical minimum distance measurement method for classification purposes. The performance of this system is encouraging with 87% of correct identification rate for test to registered image ratio of 2:1 and 84% of correct identification rate for test to registered image ratio of 4:1. © 2009 IEEE.

关键词： Pixels

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A Local-Dimming LED BLU Driving Circuit for a 42-inch LCD TV

A Local-Dimming LED BLU Driving Circuit for a 42-inch LCD TV

引用

31st International Telecommunications Energy Conference (INTELEC 09)

作者： Park, Yu-Cheol Kim, Hee-Jun Lee, Back-Haeng Shin, Dong-Hyun Intelligent Vehicle Technology R and D Center KATECH South Korea Dept. of Electronics Electrical Control and Instrumentation Engineering Hanyang University South Korea Dept. of Mechatronics Engineering Hanyang University South Korea

ISBN: (纸本)9781424424900

This paper presents an LED BLU driving circuit with a local-dimming structure. The efficiency of the proposed LED driver has been improved by parallel driving 8 serial-connected LED arrays. It employed the soft-switching boost converter topology to reduce the switching power loss of the hard switching boost converter. The soft-switching converter reveals superior ripple and efficiency. A smaller inductance can be used for the soft-switching converter contrasting to the hard-switching one and studied on an over-voltage protection circuit of the output of the driver at the no load condition.

关键词： Light emitting diodes

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Stabilization using fractional-order PIDα controllers for first order time delay system

Stabilization using fractional-order PIDα controllers for f...

引用

International Conference on Advances in Computing, control and Telecommunication Technologies, ACT 2009

作者： Vinopraba, T. Sivakumaran, N. Selvaganesan, N. Narayanan, S. Process Control Laboratory Dept. of Instrumentation and Control Engineering National Institute of Technology Trichy-620015 India Indian Institute of Space Science and Technology Thiruvananthapuram India

ISBN: (纸本)9780769539157

This brief note considers the problem of stabilizing a first-order plant with dead-time using a fractional order Proportional-Integral-Derivative (PIDα) controller. Fractional order controller provides good stability margin than the conventional PID controller. Here, the upper bound of Kd value is estimated first for all permissible value of α which is followed by computing the value of Kc. Further, the graphic results have been provided to clearly show the range of stabilizing PID α parameters [α, Kc, Ki and K d]. An example illustrates the applicability of the procedure. © 2009 IEEE.

关键词： Stabilization

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