• Proceedings of the KIPE Conference
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• 1999.07a
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• pp.206-209
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• 1999

There exists an acute need for high voltage solid-state-switches in a broad area of applications. With the proposed method using simple voltage balancing circuit with series connected IGBTs, it is realized high voltage semiconductor switches with working voltages of several order kilo-volts. The operation principle of the proposed circuit is explained and analyzed. Transient and static voltage-balancing is tested on a experimenta 3kV/45A switch with four series-connected IGBTs.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.10a
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• pp.63-64
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• 2006

• Proceedings of the Korean Magnestics Society Conference
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• 2010.06a
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• pp.197-198
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• 2010

• Proceedings of the Korean Reliability Society Conference
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• 2000.11a
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• pp.87-95
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• 2000

The testing product is the HSU(Hydrostatic Steering Unit) installed in the armored vehicle which has the compact structure of assembly with hydraulic pump, hydraulic motor, and several hydraulic valves. There are no assesment testing code for HSU within a country because the testing code for HUS is not involved in the technical concert from USA. Therefore the testing code is developed by the dynamic analysis of the armored vehicle. By the developed testing code, the test equipment is designed, manufactured, and used to apply the assesment test.

• Proceedings of the Korean Reliability Society Conference
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• 2000.11a
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• pp.75-86
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• 2000

본 연구사례는 댐 수문용 대형유압실린더(Piston Diameter :630mm, Stroke:8.3m, weight :30ton, Retraction Force:450ton)의 신뢰성평가를 위한 검토과정에서 제기된 문제를 보완하여, 평가규격을 정립하고, 시험장비를 구축하여, 초대형 유압실린더의 신뢰성 평가를 실시한 사례에 대하여 정리한 것이다.

• 제어로봇시스템학회:학술대회논문집
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• 1990.10a
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• pp.52-56
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• 1990

An algorithm is proposed to determine the optimal contact forces of robotic hands, where the soft finger contact as well as the frictional point contact are considered. Especially, the algorithm can be efficiently applied to the case of multi-point contact by inner-link as well as fingertip. To show the validities of the algorithm, several numerical exampies are presented by employing a robotics hand with three fingers each of which has four joints.

• Proceedings of the KIPE Conference
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• 1998.07a
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• pp.158-161
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• 1998

A precision high voltage generator for ion injection is implemented on HFZVS-PSCI (High Frequency Zero-Voltage-Switching Phase-Shift-Controlled Inverter). Some practical aspects of implementing precision high voltage generator with HFZVS-PSCI, such as a HFHV transformer, multiflier, and precision CR divider are discussed. The results show that the generator under the Phase-Shift-Controller has a fast dynamic response, low ripple voltage, and high accuracy.

• Proceedings of the KIEE Conference
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• 1990.07a
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• pp.425-429
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• 1990

In order to spread the practical utilization of solar energy, it depends upon how we can increase the efficiency of solar energy conversion system. This paper describes the method for calculating of optimal passive elements values in Maximum Solar Energy Tracking System. And experimental results with those calculated values are presented.

• 대한예방의학회:학술대회논문집
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• 1996.10a
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• pp.153-154
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• 1996

• 대한예방의학회:학술대회논문집
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• 1996.10a
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• pp.359-360
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• 1996