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도르래를 이용한 파력발전기 프로토 타입 개발에 관한 연구
정현석(Hyun-Seok Jung) 한국해양공학회 2010 韓國海洋工學會誌 Vol.24 No.1
From the ancient times, there are waves in the ocean. And all the moving body have energy. We have a kind of hope to convert the wave energy into electric one. Finally we can find out a power generator mechanism that mainly use the principle of pulleys. We have made drawings for this and completed the wave energy converter. This wave energy converter consists of several pulleys, rope, generator, buoys and anchors, The distance between an anchor and buoy is changed according to the hight of waves. Several sets of anchors, pulleys and buoys can make the movement of rope, and the ropes wind up a converter axis. In case of 1 meter movement of the buoy, the winding distance will be amplified 2 or 3 times if we use several moving and fixed pulleys. Based on this concept, we developed 2 kind of prototypes. One is for the test in the laboratory and the other is for the field test. Through the two test, we could confirm the usability of this mechanism.
정현석(Hyun-Seok Jung),강교철(Kyo-Chul Kang) 한국정보과학회 1995 한국정보과학회 학술발표논문집 Vol.22 No.1
소프트웨어 리엔지니어링의 목적중 하나는 시스템의 정비성 향상이다. 최근들어 시스템 개발비에 비하여 정비비의 급속한 증가로 말미암아 산업체뿐 아니라 시스템을 사용하는 대부분의 관련 분야에서 정비비 감축에 적잖은 어려움을 겪고 있다. 그러나 현재까지 소프트웨어 리엔지니어링에 있어서 실제 적용에 가능한 지침이 부족한 상태에 있어서 대부분이 임시변통식으로 적용이 이뤄져왔다. 따라서 본 논문은 이러한 문제점을 해결하기 위한 하나의 실제적 시도로써 노후화된 산업현장의 프로세스 컴퓨터를 기능위주로 재분석하여 조업공정에 더욱 효과적인 형태의 새로운 시스템구축을 목적으로한 소프트웨어 리엔지니어링 경험을 통해 얻어진 시스템 요구사항 분석 및 분산실시간 시스템디자인에 대한 가이드라인을 제시한다.
시설원예용 비닐하우스 강도 보강을 위한 삽입물에 관한 연구
정현석 ( Hyun Seok Jung ) 한국경영공학회 2011 한국경영공학회지 Vol.16 No.2
Green house is very useful structure for farmers because of their easiness of installation and low cost. However, many green houses are damaged from the heavy snow fall every year. It means farmers have to undertake the economic loss. The purpose of this research is to propose a method that will be effective to protect the green house from the heavy snow fall. Especially to develop a reinforcement method of a pipe used in the green house is the main focus. The various insert material in a pipe is considered and simulated.
정현석(Hyun-Seok Jung),Ngoc Hung Bui,김정훈(Jeung-Hoon Kim),김종수(Jong-Soo Kim) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
In the present paper, it was tried to visualization inside of the oscillating heat pipe to observe the flow pattern of working fluid and thermal characteristic of oscillating heat pipe was described. Test condition varied as follows ; Input heat load - 40, 80, 120, 160W, Inclination angle - 90, 45, 0, -45, -90˚. R-142b was used as a working fluid. Turns number was 50 and hydraulic diameter was about 1.3㎜. As the result of the experiment, there was no connection between heating mode and effective thermal conductivity and effective thermal conductivity of the high input heat load was better than that of the low instead.