• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2000.11a
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• pp.243-248
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• 2000

하드디스크의 트랙 밀도를 높이기 위해서는 충분한 서보대역을 갖는 액츄에이터를 개발하는 것이 필수적이다 이 논문에서는 액츄에이터의 동특성 중에서 서보대역을 제한하는 주된 요인을 알아보기 위해 실험 모드 해석과 유한 요소 해석을 수행하였다. 우선 액츄에이터를 구성하고 있는 VCM 코일, E 블럭, 서스펜션등의 부분계에 대한 유한 요소 해석을 수행하였고 모달 실험을 통해 이를 검증하였다. 검증된 각 부분계의 모델을 결합하여 한 개의 서스펜션을 갖는 액츄에이터 시스템의 유한 요소 모델을 개발하였고 이를 통해 서보 성능과 관계된 모달 파라미터들을 규명하였다.

• Journal of Advanced Marine Engineering and Technology
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• v.33 no.8
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• pp.1246-1253
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• 2009

This paper presents derived a calculating form of fuzzy inference, based on decomposition of $\alpha$-level sets. Based on the calculating form it is propose that fuzzy logic circuits of PI+PD controller are a body from fuzzy inference to defuzzificaion in cases where the command variable u directly is generated PWM. The effect of quantization on $\alpha$-levels is investigated. with input/out characteristics of fuzzy controller by simulation. It is concluded that 4 quantization levels are sufficient result for fuzzy control performance of DC servo system. Simulation and experimental results demonstrated that the hardware implementation of the proposed controller can successfully provide good performance on the position control of DC servo system.

• Journal of Advanced Navigation Technology
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• v.13 no.5
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• pp.705-713
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• 2009

This paper proposes CORBA-based visual servoing system of humanoid robot. To effectively control the humanoid robot which is connected to network, it needs to define necessary services for visual servoing as distribution object, and realize them in the middleware. For realizing it following services should be addressed. Naming service for searching a necessary service with unique name assigned to each object, image service for supplying image obtained from stereo camera. In the experiment, we show the result of balloon tracking and bursting that the robot tracks balloons as target objects in the real time, and if a balloon stop for a certain time, then the robot bursts the balloon.

• Journal of the Institute of Convergence Signal Processing
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• v.8 no.3
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• pp.217-221
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• 2007

This paper deals with the robust nonlinear controller design using output feedback for a Chua circuit which is one of the well-known nonlinear models. First, an exosystem for reference signal tracking is defined, and error dynamic equations are derived from the differentiation of the output tracking error equation. The normal sliding surface is modified using the integral type servo compensator. The parameters in the equations of the modified sliding surface and servo compensator are determined by using the Hurwitz condition of stability. Especially the error signals can't be obtained directly from the output because all parameters are assumed unknown. So instead, a high gain observer is designed. From this estimated error signals, a stabilizing controller is designed. Simulation is done for demonstrating the effectiveness of the suggested algorithm.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.8 no.3
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• pp.88-95
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• 1994

A scheme of IESFVSC(Integral Error State Feedback Variable Structure Controller) is proposed for a DC servo position control system with the disturbances which do not satisfy the matching condition. The proposed control system is composed of servo compensator and state feedback VSC. The servo compensator enhances the robustness of the control system against various types of disturbance, and makes effective tracking possible without using error dynamics. The IESFVSC is applied to the practical design of a robust DC servo control system and the control performances are verified through theoretical analyses and simulations.

• Journal of KSNVE
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• v.25 no.1
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• pp.7-15
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• 2015

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2005.11a
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• pp.273-274
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• 2005

• Korean Architects
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• no.11 s.212
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• pp.78-85
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• 1986

• NEWSLETTER 전기공업
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• no.95-12 s.133
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• pp.10-40
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• 1995

• The Magazine of the IEIE
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• v.28 no.9
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• pp.81-82
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• 2001