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Conference Record of the 2004 IEEE Industry Applications Conference;39th IAS Annual Meeting

作者： Kim, Hyosung Ji, Jun-Keun Kim, Jang-Hwan Sul, Seung-Ki Kim, Kyung-Hwan Department of Control Engineering Cheonan National Technical College Korea Republic of Div. of Info. Technology Engineering Soonchunhyang University Korea Republic of Sch. of Elec. Eng. and Comp. Science Seoul National University Korea Republic of EWHA Technol. Information Company Korea Republic of

This paper proposes a novel topology and control algorithm for a three-phase line-interactive UPS system with active power-line conditioning capability. This paper presents a simple and systematic control algorithm to regulate the source current and the load voltage of the proposed UPS system using PQR transformation. A parallel inverter operating as a controlled voltage source regulates the source current sinusoidal by controlling the applied voltage on an ac line inductor. The series inverter operating as a dynamic voltage restorer (DVR) compensates for the main source voltage and rides through the output load voltage to be balanced and harmonic-free. Both of the series and parallel inverters always act as controllable voltage sources independently, so that the three-phase output voltages can transfer seamlessly between normal mode and backup mode. The proposed UPS system has high operation efficiency and high usage of the converter capacity, and good endurance against voltage transients or EMI noise resulted from the mains. The feasibility of the proposed UPS system has been investigated and verified through computer simulations and experiments by a 60kVA prototype UPS.

关键词： Uninterruptible power systems

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Implementation of application-specific DSP for OFDM systems

Implementation of application-specific DSP for OFDM systems

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2004 IEEE International Symposium on Circuits and Systems - Proceedings

作者： Lee, Jeong H. Moon, Jong H. Heo, Kyung L. Sunwoo, Myung H. Oh, Seung K. Kim, In H. Sch. of Elec./Computer Engineering Ajou University San 5 Wonchun-Dong Youngtong-Ku Suwon 442-749 Korea Republic of Korea Inst. of S/T Eval./Planning San 5 Wonchun-Dong Youngtong-Ku Suwon 442-749 Korea Republic of

This paper describes implementation of an application-specific DSP for OFDM modem systems. The proposed instructions can support computations of various blocks in OFDM systems. The Data ALU is specially designed and optimized for the proposed instructions. Performance comparisons show that the number of clock cycles improves over 10 % compared with Carmel DSP and over 50% compared with TMS320C62X for FFT computation. However, the size of the DSP is much smaller than existing DSPs. The proposed architecture is implemented using iPROVE FPGA board and verification is performed using assembly programs that implement most of OFDM blocks. The SQNR value of FFT output is about 71 dB.

关键词： Digital signal processing

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A further study of nonlinear feedback system with chaotic oscillation

A further study of nonlinear feedback system with chaotic os...

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WCICA 2004 - Fifth World Congress on Intelligent Control and Automation, Conference Proceedings

作者： Han, Fengling Yu, Xinghuo Feng, Yong Chen, Guanrong Fac. of Info. and Communication Central Queensland University Rockhampton QLD 4702 Australia Sch. of Elec./Computer Engineering Roy. Melbourne Inst. of Technology Melbourne Vic. 3001 Australia Department of Electrical Engineering Harbin Institute of Technology 150001 China Department of Electronic Engineering City University of Hong Kong

This paper studies a simple nonlinear feedback system that consists of a relay-hysteresis in feedback with a linear continuous-time unstable second-order system. With suitable parameters and initial conditions, the system can create chaos. The analytic solutions on occurrence chaos and the criterion for maximum stability margin of chaos are presented.

关键词： Nonlinear systems

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Adaptive concatenated coding for wireless real-time communications

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Doktorsavhandlingar vid Chalmers Tekniska Hogskola 2004年第2198期

作者： Uhlemann, Elisabeth Sch. Info. Sci. Comp./Elec. Eng. Halmstad University Department of Computer Engineering Chalmers University Of Technology Göteborg Sweden

The incremental redundancy hybrid automatic repeat request (IR-HARQ) sch.mes used in wireless communications was discussed. Concatenated coding used in IR-HARQ sch.mes provided a new array of possibilities for adaptability in terms of decoding complexity and communication time versus reliability. The value of the Quality of Service (QoS) parameters were transformed into actions taken by the link layer protocol in terms of adaptive coding strategies. The IR-HARQ protocol was found to be an efficient and fault tolerant link layer protocol.

关键词： Wireless telec.mmunication systems

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Reliable H∞ control of singular systems with time delay and actuator failures

Reliable H∞ control of singular systems with time delay and...

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Proceedings of the 23rd IASTED International Conference on Modelling, Identification, and Control

作者： Kim, Jong Hae Jeung, Eun Tae Lee, Sung Yong Park, Hong Bae Division of Electronics Engineering Sunmoon University Asan-si Chungnam 336-708 Korea Republic of Department of Control Engineering Changwon National University Changwon Kyungnam 641-773 Korea Republic of Sch. of Elec. Eng. and Comp. Science Kyungpook National University Daegu 702-701 Korea Republic of

This paper provides a reliable H∞ state feedback controller design method for singular systems with/without time-varying delay satisfying asymptotic stability with H∞ norm bound and all actuator failures occurred within the prescribed subset. The sufficient condition for the existence of a reliable H∞ controller and the controller design method are presented by linear matrix inequality (LMI), singular value decomposition, sch.r complements, and changes of variables. Since the obtained sufficient condition can be expressed as an LMI form, all variables can be calculated simultaneously. A numerical example is given to illustrate the validity of the result.

关键词： Feedback control

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A new approach to the design of dynamic output feedback stabilizers for LTI systems

A new approach to the design of dynamic output feedback stab...

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Proceedings of the 2004 American Control Conference (AAC)

作者： Son, Young I. Shim, Hyungbo Jo, Nam H. Kim, Kab-Il NPT Center Department of Electrical Engineering Myongji University Yong-In Kyunggido 449-728 Korea Republic of Sch. of Elec. Eng. and Comp. Science Seoul National Univ. Seoul 151-744 Korea Republic of Schoool of Electrical Engineering Soongsil University Seoul 156-743 Korea Republic of

We present a new state-space approach for designing a dynamic output feedback control law which stabilizes a class of linear time invariant systems. All the states of the given system are not measurable and only the output is used to design the stabilizing control law. In the design sch.me, however, we first assume that the given system can be stabilized by a feedback law composed of the output and its derivatives of a certain order. Beginning with this assumption, we systematically construct a dynamic system which removes the need of the derivatives. The actual order of the constructed dynamic feedback controller is the dimension of the output times the order of derivatives that are necessary. Therefore, it may be useful for order reduction of dynamic controllers. A set-point regulation problem for a magnetic levitation system is also solved without using the velocity measurement.

关键词： Feedback control

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Hand-eye coordination of a Robot for the automatic inspection of steam-generator tubes in nuclear power plants

Hand-eye coordination of a Robot for the automatic inspectio...

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Proceedings of the 11th Asian Pacific Conference on Nondestructive Testing

作者： Choi, Doo-Hyun Song, Young-Chul Kim, Ji-Hong Kim, Jung-Gu Sch. of Elec. Eng. and Comp. Science Kyungpook National Univeristy 1370 Sankyuk-Dong Puk-Gu Daegu 702-701 Korea Republic of Film and Visual Engineering Major Dong-Eui University Gaya-Dong Busanjin-Gu Busan 614-714 Korea Republic of Mech. and Elec. Eng. Research Team RIST P. O. Box 135 Pohang 790-600 Korea Republic of

The inspection of steam-generator tubes in nuclear power plants needs to collect test signals in a highly radiated region that is not accessible by humans. In general, a robot equipped with a camera and a test probe is used to handle such a dangerous environment. The robot moves the probe to right below a tube to be inspected and then the probe is inserted into the tube. The inspection signals are acquired while the probe is pulling back. Currently, an operator in a control room controls all the process remotely. To make a fully automatic inspection system, first of all, a control mechanism is needed to position the probe to the proper location. This is so called a hand-eye coordination problem. In this paper, a hand-eye coordination method for a robot has been presented. The proposed method consists of the two consecutive control modes: rough positioning and fine-tuning. The rough positioning controller tries to position its probe near a target place using kinematics information and the known environments, and then the fine-tuning controller tries to adjust the probe to the target using the image acquired by the camera attached to the robot. The usefulness of the proposed method has been tested and verified through experiments.

关键词： Nuclear power plants

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Development of a micro gyroscope using epitaxial polysilicon and its performance test

Development of a micro gyroscope using epitaxial polysilicon...

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Advances in Fracture and Failure Prevention: Proceedings of the Fifth International Conference on Fracture and Strength of Solids (FEOFS2003): Second International Conference on Physics and Chemistry of Fracture and Failure Prevention (2nd ICPCF)

作者： Sung, Woon Tahk Lim, Hyung-Taek Kang, Taesam Lee, Jang Gyu Lee, Young Jae Sch. of Elec. Eng./Computer Science Seoul National University Shilim 9-dong Kwanak-gu Seoul Korea Republic of MEMS Lab. Samsung Adv. Institute of Technology P.O. Box 111 Suwon Korea Republic of Department of Aerospace Engineering Konkuk University Kwangjin-gu Seoul Korea Republic of

This paper presents a design and performance tests of in-plane gimbal-structured Z-axis gyroscope. The device is manufactured by conventional surface micro machining process using 15μm-thickness epitaxially grown polysilicon. The total size of the device is 4.8mm × 4.8mm in area including 1mm × 1mm core gyro structure and pads for wire bonding. It is designed as two-gimbaled structure which separates inner and outer gimbals. This leads two nearly identical modes of gyroscope, i.e. driving and sensing mode, to mechanically decoupled ones, resulting in enhanced performance. Experiments are accomplished through frequency analysis and dynamic tests using a detection circuit, a vacuum chamber and a rate table. Through experiments, it is confirmed that the designed gyroscope has 0.003 deg/sec resolution, 0.00095 deg/sec/√Hz noise equivalent density, 0.57% FSO nonlinearity error and 0.02 deg/sec bias stability.

关键词： Polysilicon

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Compact tunable CMOS OTA with high linearity

Compact tunable CMOS OTA with high linearity

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2004 IEEE International Symposium on Circuits and Systems - Proceedings

作者： Kachare, Meghraj Ramirez-Angulo, Jaime López-Martín, Antonio J. Carvajal, Ramon G. Klipsch Sch. of Elec./Computer Eng. New Mexico State University Las Cruces NM United States Dept. of Electrical Engineering Public University of Navarra Pamplona Spain Dpto. de Ingenieria Electronica Escuela Superior de Ingenieros Universidad de Sevilla Spain

The use of simple and extremely accurate voltage buffers to drive two MOS transistors in triode region is employed to obtain a very linear voltage-to-current conversion. Transconductance can be simply and precisely adjusted using DC level shifters. Measurement results of a balanced transconductor fabricated in a 0.5-μm CMOS technology show a -54 dB THD at 100 kHz for 80-μA peak-to-peak outputs, using a 2-V supply. Silicon area is 0.07 mm2 and static power consumption is 0.92 mW.

关键词： CMOS integrated circuits

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Development of SPINEBOT for spine surgery

Development of SPINEBOT for spine surgery

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2004 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)

作者： Chung, G.B. Lee, S.G. Oh, S.M. Yi, B.-J. Kim, W.K. Kim, Y.S. Park, J.I. Oh, S.H. Ctr. for Intelligent Surgery Systems Hanyang University Sch. of Elec. Eng. and Comp. Science Hanyang University Dept. of Contr. and Instrum. Eng. Korea University College of Medicine Hanyang University Division of Electrical Engineering Hanyang University

ISBN: (纸本)0780384636

In most spine surgeries, the physician directly performs the surgical operation with help of specially designed surgical tools along with off-line CT images and possibly with fluoroscopic images that provide the on-line status of current surgical operation for patient However, the surgical procedure generally requires accurate operational skills and intuition of the physician. Sometimes, trifling errors or misjudgments during surgical operation could result in unrecoverable damages to patients. To cope with these problems, robotic technology has been incorporated into the surgical operations in various levels [1-3]. In this paper, a robotic system for percutaneous spine surgery, called SPINEBOT, is developed. The expected roles of SPINEBOT are to provide the guide for the K-wire, to help the physician to locate and orient the position of surgery more accurately, and to compensate for respiration movement of the patient's body during operation. A preliminary experiment has been conducted with a mockup environment of surgical operation. The experimental results confirm that the SPINEBOT is not only able to guide by accurately pointing and orienting the specified location, but also successfully compensate the emulated respiratory movement of the patient.

关键词： Surgery

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