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배나무가루이 중부지방에 대발생 '93 - 쓰가루, 탄저병늘어 방제관심 필요 '94 - 올해는 전반적으로 과실비대 불량하나 당도는 증가하고 관수효과 높아
최용문 한국작물보호협회 1994 자연과 농업 Vol.15 No.6
가게에 수북하게 쌓여있는 과일 무더기를 보면 올해 같은 무더위와 가뭄을 견디어 내고 충실한 과일들을 수확이 가능하게 한 자연에 경외감을 느낀다. 시드는 나뭇잎을 보며 애태웠을 농민과 여름휴가까지 중지하면서 대책에 골몰했던 농업관계 공무원에게 감사를 드리며 지난해의 이상저온과 올해의 고온 및 한발에서의 과수 병해충의 발생상 및 특징을 분석하여 앞으로의 대책수립에 자료를 제공코자 하며 올해의 기상이 과수 수확량과 품질에 미친 영향에 대하여 알아본다.
최용문,박경암 대한기계학회 1993 대한기계학회논문집 Vol.17 No.2
The circuit board of an electronic equipment were simulated with a vertical channel which had thermal blocks protruded from one of the channel walls. A rought front plate was made of a circuit board attached with short wires to simulate the back side of a printed circuit board. Natural convection experiments were carried out to study the effects of channel space and rough front plate and to find the suitable characteristic value after the fourth row. The effect of a rough front plate was negligble. There were negligible effects of the channel space on the first and second heaters. Heat transfer coefficients after the third row decreased as the channel space decreased. Heat transfer coefficients were almost constant for larger than 20 mm channel space. A characteristic length was suggested to non-dimensionalize Nu and Ra numbers in a vertical channel with protruded heaters. A correlation was obtained using the new characteristic lengths.
Characteristic test methods of the thermal mass flow controller
최용문,최해만,이생희,강웅 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.3
A thermal mass flow controller (MFC) is used to measure and control the mass flow of gases in industrial fields, for example, in thesemiconductor manufacturing process. In the present study, the characteristic test methods for rangeability, linearity, reproducibility,effects of temperature and valve response time are proposed to evaluate the performance of the MFC. Three commercial MFC productsare tested by gas flow standard system and a sonic nozzle to verify the effectiveness of the proposed test methods. Linearity tests showthat reading errors before and after adjustment must be provided to consumers. Reproducibility tests were conducted to evaluate theshort-term stability of MFCs. Temperature effect tests represent that deviation due to temperature effect of MFC body is larger than thatof gas flowing. Three MFCs show different response characteristics according to direction of flow rate change in response time test bymeasuring the flow setpoint, flow output signal, and real flow rate.
응축 풀 내의 비정상 층류 제트의 유동 특성에 관한 연구
최용문,김종보,Choi, Yong Moon,Kim, Chong Bo 대한설비공학회 1988 설비저널 Vol.17 No.4
The pressure suppression pool of BWR(Boiling Water Reactor) is subjected to hydrodynamic impact in the event of a LOCA(Loss of Coolant Accident). The pressure increase in the reactor dry cell would force the existing water of a vent pipe into the suppression pool. When the water is ejected through the pipe opening into the suppression pool, an abrupt downward force is transmitted to the suppression pool floor. Consequently, many structures installed within the pool must be able to withstand these forces. In order to determine the optimum safe locations of the pool structures, numerical analysis have been carried out to investigate the hydrodynamic behavior of the water jet. In the present analysis, a two-dimensional numerical model is utilized to solve transient flow equations.