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정재동,정인성,유호선,이준식,Chung, J.D.,Jung, I.S.,Yoo, H.,Lee, J.S. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.3
This paper presents a theoretical model for predicting transient behaviors during storage process of the cool storage system using the R141b clathrate. Introduction of the lumped capacitance method along with a brine reservoir having large thermal capacity yields a set of simplified energy equations. Based on the Arrhenius equation and the known experimental findings, the formation rate of clathrate for which the degree of subcooling is properly accounted is newly developed. An effective nondimensionalization of the model equations facilitates the closure of modeling as well as parametric study. Calculated results for a specific case not only simulate a typical pattern of temperautre variation in the tank successfully, but also agree reasonably well with available data. The effect of each characteristic parameter on the system performance is also investigated. It is revealed that the dominant among relevant parameters are the activation energy of reaction, the degree of subcoling and the initial mass fraction of refrigerant. Finally, the uncertainty associated with modeling of the shaft work variation appears to need further studies.
차량의 후방충돌시 Whiplash Injury 방지를 위한 Active Headrest System의 개발에 관한 연구
김동욱(D. W. Kim),김남균(N. G. Kim),정인성(I. S. Chung) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
In our study, we developed an active headrest system to prevent whiplash injury when a rear-end collision. The whiplash injury is caused by an excessive acceleration of head. We could diminish the head movement and the change of an acceleration by minimizing the gap between the head and headrest.<br/> From the result. we confirmed that active headrest system might be an effective device for preventing the whiplash injury.<br/>
최적 설계법을 이용한 구조물 안전을 위한 질량 감소 연구
신귀수,이기형,정인성 한국산업안전학회 1998 한국안전학회지 Vol.13 No.1
This paper is presented that theoretical optimization design method in order to consider mass reduction for the structural safety. In this paper, it described methods for reducing vibration in structural safety by the determination of the optimum sizes and locations of running masses through formal mathematical optimization techniques. The optimization procedure which employs the tunning masses and corresponding locations is developed. Design variables are systematically changed to achieve low values of shear without a large mass penalty. Three optimazation methods are developed and tested. The first is based on minimizing the modal shaping parameter which indirectly reduce the modal shear amplitudes corresponding to each harmonic of airload. The second method reduces these amplitudes directly and the third method reduces the shear as a function of time during a revolution of the blade. The first method works well for reducing the shear for one mode responding to a single harmonic of the airload but has been found in some bases to be ineffective for more than one mode.