• Transactions of the Korean Society of Mechanical Engineers A
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• v.20 no.1
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• pp.172-179
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• 1996

For mechanical systems operating at high tempertature, thermal fatigue phenomenon has been recognized as a major cause of mechanical component failures. To evaluate cumulative fatigue damage as a conesquence of thermal fatugue on real time, the stress tranfer function(Green's function) approach is popularly used. The objective of this paper is to investigate the effect of thermophsical properties on the stress tranfer function. For this purpose a modified Green's function approach considering temperature-dependent thermophysical properties is proposed. Two case studies were performed and the proposed approach agrees well with full finite element analysis.

• Proceedings of the Membrane Society of Korea Conference
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• 1996.06a
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• pp.33-89
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• 1996

History of Membrane Process Development 1920 : microfiltration : Zsigmondy 1930 : ultrafiltration 1950 : hemodialysis : Kolff 1955 : electrodialysis 1960 : reverse osmosis : Loeb, sourirajan 1960 : ultrafiltration 1979 : gas separation : Henis, Tripodi 1982 : pervaporation : Tusel

• Proceedings of the Korean Society of Embryo Transfer Conference
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• 2004.10a
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• pp.51-52
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• 2004

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 1996.11a
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• pp.49-52
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• 1996

재해발생 형태가 시간과 장소에 따라 미료하게 달라지고 사고 발생시 재산피해는 극대화될 가능성이 높아짐에 따라 위험요소 감지를 위한 중앙집중적감시의 방재 시스템을 선호하고 있다. 그러나 기존의 종합 방재 시스템에서 사용하고 있는 RS232C나 RS422로는 원거리에서의 제어 및 감시가 곤란하다. 본 논문에서는 인터네트상의 WWW프로토콜인 HTTP를 사용하여 원거리에서 감시 및 제어할 수 있는 자동화 방재시스템의 통신환경을 구현하였다.

• Transactions of the Korean Society of Mechanical Engineers
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• v.1 no.2
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• pp.95-103
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• 1977

The expermental research was carried out to investigate the thermal performance of the locally manufactured radiators for 1300cc automobiles. The choice of .epsilon. value (the ratio of water tube surface area to the total heat transfer area ) resulted in remarkable difference in their performance including the Louver effect, the overrall heat tranfer coefficient and the heat dissipation capability.

• Journal of Photoscience
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• v.12 no.2
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• pp.63-66
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• 2005

The azomethine ylide forming photoreaction has been explored by probing the excited state chemistry of several N-trimethylsilylmethyl substituted cyclic and acyclic imides and amide analogs. N-[(Trimethylsilyl)methyl]-N-mesylbenzamide (5) undergoes the excited state C to O silyl migration reaction to produce azomethine ylide intermediate 13. This ylide undergoes electrocyclization to form transient aziridine intermediate 14 which react further by ring opening to generate N-phenacylamine product 10. On the other hand, photolysis of N-[N-mesyl-N-(trimethylsilyl)methyl]aminoethyl-N-mesylbenzamide (8) brings about desilylation resulting in the production of dimer 17.

• 제어로봇시스템학회:학술대회논문집
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• 1996.10b
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• pp.1201-1204
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• 1996

The previous results on LTR methods for time delay systems need the solution of the operator-type Riccati equation. In addition, it can be difficult to make the target loop shape representing the design specification. This paper proposes a new LTR method for input-delayed systems using well-established LTR method for non-delay systems. For doing this, a time delay margin is derived and the time delay of the input-delayed systems is assumed less than equal to the time delay margin. A simple example is presented for illustrations.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 1998.03a
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• pp.209-213
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• 1998

This study considers flowshop scheduling problem related to flexible maufacturing cell in which consists of two machining centers, robots for loading/unloading, and an automated guided vehicle(AGV) for material handling between two machining centers. Because no machinng center has buffer storage for work in process, a machining center can not release a finished job until the empty AGV is available at that machining center. While the AGV cannot tranfer an unfinished job to a machining center until the machining center empty. In this paper, an new heuristic algorithm is given to find the sequence that minimize their makespan.

• Proceedings of the KIEE Conference
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• 1990.07a
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• pp.467-470
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• 1990

This thesis presents a simple heuristic algorithm which can be applied. to a quadruped wafting vehicle for increasing the terrain adaptability. The proposed method controls a leg length which is in tranfer phase to maintain initial orientation of the robot body by using FSR type force sensors attached to foot-tips. Also, some basic experiments using the vehicle are performed to demonstrate the effectiveness of the algorithm.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.32 no.2
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• pp.59-64
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• 1983

This paper deals with the transient energy method of transient stability analysis of multi-machine power system by improving the transfer conductance, the kinetic energy and the critical transient energy. The tranfer conductance is considered more correctly, the generators of system are seperated to two states (critical and the rest state)and the correction term of critical transient energy (to reference point) is added. This analysis is performed by digital computer simulation and the application of this method to two model systems has shown its superiority to other available methods.