• 유공압시스템학회:학술대회논문집
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• 2010.06a
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• pp.33-38
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• 2010

As for an oil hydraulic vane pump of vehicle hydraulic systems, the highest of planning technique required by the acquisition of optimum profile data which can be available to predict noises and vibrations. Pressure pulsation may result in considerable vibration and noise of pump component as well as cavitation in hydraulic system. The influences of the discharge pressure and rotating speed of the vane on the dynamic pressure in chamber surrounding a vane have been investigated. It is very important to predict pressure pulsation in vane pump. This paper presents analysis of technique of vane pump for automatic transmission. The predicted result using AMESim model were good agreement with the experimentally obtained results.

• Proceedings of the KIEE Conference
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• 2007.10a
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• pp.187-188
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• 2007

This paper describes a simple and high-performance LDO regulator designed using a $0.18{\mu}m$ CMOS process. It is designed to provide a regulated voltage for on-chip small loads instead of for off-chip heavy loads. Since the load capacitance is very small in this applications, the frequency compensation can be easily achieved without a buffer. The designed LDO drives a load current up to 15mA and dissipates only 12uA quiescent current. The line regulation is and the load regulation is for a 9mA load step. The PSRR at 10kHz is 54dB.

• Journal of IKEEE
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• v.20 no.1
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• pp.119-122
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• 2016

In this paper, we propose LDO regulator to operate using Pseude resistor instead of widely used Feedback resistor in conventional LDO regulator. Proposed Feedback network using Pseudo resistor has smaller area than the conventional feedback resistor and plays the role of an conventional LDO regulator. Thus, it has been proposed to compensate for the disadvantages of LDO regulator with noise. Although proposed LDO regulator compared with conventional LDO regulator has similar performance, this LDO regulator provide higher efficiency by reducing the overshoot and decreasing the area. This circuit was designed to using a Dongbu Hitek 0.18um CMOS process.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.15 no.4
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• pp.315-323
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• 1990

A design technique of dynamic stabilization controller for the intrinsic unstable inverted pendulum system is introduced. Mathematical modelling with the more complex nonlinearity and the stabilized control theory presented by C.D.Johnson are adapted to this system by using the state-space approach. And the Stabilized controller with the designed optimal regulator type which can be fastly tracked and can be accurately counteracted aginst all effects of the constant distrubances and the parameteric variations is simulated and is implemeted successfully on the microcomputer.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.7
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• pp.1514-1519
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• 2003

This paper presents modeling and analysis of static and dynamic characteristics in three phase PWM Boost AC-AC converter used for input voltage sag compensation of custom power. Especially, using circuit DQ transformation technique, an equivalent circuit in fundamental frequency domain is obtained which has all the system characteristics. Moreover, voltage gain and input power factor is analytically induced and linearized state equation at the specific operating point is given. Finally, PSIM simulation results show the validity of the Nosed modelling and analyses.

• Proceedings of the KIPE Conference
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• 2007.07a
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• pp.415-417
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• 2007

In this paper, The authors study the boost Regulator as a DC-DC Converter like a power supply and describe the investigation result about the two phase with combined boost regulator which has the same effect that the switching frequency of the solid-state-switch is two times. As a result, the ripple of the input current and output current is better improved.

• Proceedings of the KIEE Conference
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• 2009.04b
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• pp.215-218
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• 2009

본 논문에서는 유량변화에 따른 200W급 PEMFC 운전특성을 연구하였다. 연료공급은 수소탱크와 공기공급용 컴프레셔를 이용하였고 유량은 MFC를 이용하여 제어하였다. 연료의 가습은 Bubbling type을 사용하였고 유량변화에 대한 반응차이를 크게 보기 위해 Back pressure 레귤레이터를 제거함으로써 확연한 차이를 얻을 수 있었다.

• Journal of Sensor Science and Technology
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• v.20 no.4
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• pp.254-259
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• 2011

In this paper, a current stimulator circuit with adaptive supply regulator for retinal prosthesis is proposed. In current stimulation systems, the stimulating circuits with wide voltage swing range are needed due to the high impedance of the retina cell and microelectrodes. Thus, previous researches adopt the high voltage architecture to obtain the enough operating range. The high voltage architecture, however, could increase the power consumption and can damage the retina cells. The proposed circuit provides the adaptively regulated supply voltage by measuring the difference between desired stimulation current and the actual stimulation current. The proposed circuit can achieve the extended range of the allowable cell impedance, improved accuracy of the stimulation current, and higher biosafety.

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.165-166
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• 2014

기존 LED(Light Emitting Diode) 전류 제어용 SSPR(Secondary Side Post Regulator) 스위치를 갖는 구조의 다중출력 컨버터는 LED 정 전류 제어를 위한 별도의 부스트 컨버터 없이 전류제어가 가능하여 원가 및 부피 저감과 효율이 상승하는 장점이 있다. 하지만, 주 출력단(Master)의 피드백을 받아 1차 측 메인 스위치를 제어하게 되어 제어 회로가 복잡하고 주 출력단 부하 변동에 의해 부 출력단(Slave)의 크로스-레귤레이션(Cross-Regulation) 특성이 좋지 않은 단점이 있다. 따라서, 본 논문에서는 기존 SSPR 스위치의 장점을 갖고 주 출력 단의 부하 변동에도 부 출력단의 크로스-레귤레이션 특성이 좋은 새로운 직렬 공진형 LED 구동회로를 제안한다. 최종적으로 제안 회로를 4채널 LED 구동회로에 적용하여 그 실험결과를 바탕으로 제안 회로의 타당성을 검증하였다.

• Journal of the Korean Society for Precision Engineering
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• v.15 no.11
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• pp.108-120
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• 1998

In this paper, a new control system design algorithm, which has the advantages of the existing LQR and eigenstrcture assignment methods, is proposed. The method of the transformation matrix via block controller is utilized to develop the scheme. Using the proposed algorithm, LQR weighting matrices q and R, which satisfy the desired closed-loop eigenvalues and eigenvectors, can be achieved using only simple matrix computations. The usefulness of the proposed scheme is verified by applying to a numerical example and an automotive active suspension control system design.