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김용재(Y. J. Kim),강원구(W. G. Kang),김수겸(S. K. Kim),김지석(J. S. Kim),김준영(J. Y. Kim),신동준(D. J. Shin),윤삼손(S. S. Yoon),류시양(S. Y. Ryu) 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.5
The size of electronic devices is becoming miniaturized and performances are becoming more and more high function. So power consumption of the product is greatly increased. And, in the progress of product development, thermal design is a very important task. In the thermal design process, we need many climate chambers to measure temperature of electronic components and check operation of the products under cold and hot environments. However, the climate chamber needs expensive maintenance cost and occupies large space. This is a huge burden to the company. Most developers replace high-temperature tests by low cost room temperature tests. There is an issue how much value the developers add to the results of room temperature tests for converting to the results of high temperature tests. In this paper, some results based on tests and thermal simulation analyses have been reported to suggest the value.
안찬솔(C.S. Ahn),김정엽(J.Y Kim),주상현(S.H. Joo),김지석(J.S. Kim) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
In high-rise commercial buildings, the smoke that occurs in case of a fire tends to be spread rapidly to the horizontal and vertical direction due to the structural characteristics of the buildings. In particular, since the smoke spread to evacuation stairwells and elevator shafts results in the toll of lives, “Design Guidelines for Smoke Control System of Special Evacuation Stairwell and Lobby” of NFSC 501A was proposed in Korea as one of fire safety standards to prevent the penetration of the smoke into the above mentioned areas. Towards this end, the vestibule pressurization method was largely used in the past, but the stairwell pressurization method is introducing in recent years. This study attempted to analyze whether air egress velocity suitable for the standards is secured, targeting the actual buildings designed with sandwich type ventilation system through numerical analysis. For this, a real-size model for numerical analysis was made by measuring the floor plan, airflow, pressure and flow area of any floor in a fire, and velocity to prevent smoke backflow was analyzed.
김병철(B. C. Kim),이대영(D. Y. Lee),김지석(J. S. Kim),인현기(H. K. In),조규진(K. J. Cho) 한국재활복지공학회 2012 한국재활복지공학회 학술대회논문집 Vol.2012 No.11
In this paper, we present the new type of pen holder for SCI patients. It helps to grasp the pen by changing the posture of human hand to the tripod grasp while most of the former pen holder grasp the pen by inserting to a hole of pen holder. Design concepts of this pen holder are glove type, tendon driven, and under-actuation. Pen holder is made with glove to carry and to wear easily for disabled people. Tendon driven method is used to actuate finger with small volumes. It also uses the under-actuation mechanism to move fingers simply.