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조경재(K.J.Cho),이정일(J.I.Lee),윤석암(S.A.Yoon),차인수(I.S.Cha),이권현(K.H.Lee) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
In this paper, systematization design method by analogical interpretation which is profitable In the compatability and standardization of developed products and is useful of reducing construction time and price was introduced<br/> Systematization design based on analogical interpretation is a method which systematizes each characteristic with mathematical description 10 order to make variable design parameters correspond with the terms desired<br/> In this paper, after choosing a differential transformer as the sample for design components each characteristic was expressed mathematically by analogical interpretation and miniaturized ones were manufactured by similarity factors<br/> The relationship between input voltages of an actual differential transformer and the model and output voltages occurred by the change of the displacements In operational axis was shown
[論文] 전기 점화 방식에 있어서 초기 점화액(Spark Kernel) 성장의 정압특성
김현우(H.W.Kim),정인석(I.S.Jeung),조경국(K.K.Cho) 한국자동차공학회 1990 오토저널 Vol.12 No.4
To study on the behavior of the early stage of the spark kernel at constant pressure condition, the expressions of the thermal properties such as compressibility factor, thermal conductivity, and electrical conductivity of the high temperature air were newly suggested. The newly suggested simple expressions of the thermal properties of the high temperature air showed good results.<br/> Under the assumption of constant pressure,one dimensional numerical analysis was executed by varying surrounding conditions and discharging current of electrical spark.<br/> Numerical results show that high surrounding pressure suppresses the growth of the spark kernel but supplies much electrical energy into the air, on the other hand high surrounding temperature increases the growth of the spark kernel but supplies less electrical energy. Also the result shows that, in case of direct current discharge, deposited electrical energy is able to be expressed in linear function of time approximately.
[論文] 風洞實驗에 依한 승용차의 最適外形決定에 關한 硏究
김근호(K. H. Kim),노오현(O. H. Rho),조경국(K. K. Cho) 한국자동차공학회 1983 오토저널 Vol.5 No.2
The aerodynamic characteristics of the most popular car (PONY 2) produced in Korea have been experimentally investigated by Seoul National University's wind tunnel. The model (PONY 2) chosen for the wind tunnel was a 1/5 scale of the original car without simulated underbody, cooling air flow and accessories. The measured aerodymanic drag coefficient corrected by JARI formula is 0.45 which is very close to those of small foreign cars.<br/> To see the effect of the different configurations on the aerodynamic drag, the modifications have been made by changing the hood slope and backlight slope, and putting the add-on-aerodynamic devices on the orignal shape. The rear spoiler was found the most effective one to reduce the aerodynamic drag. It may be concluded that the considerable aerodnamic drag reduction can be achieved by changing the slopes and A-O-A devices at the proper places of the car.
최홍준(H.J. Choi),신영식(S.Y. Young),차인수(I.S. Cha),최정식(J.S. Choi),김동묵(D.M. Kim),조경재(K.J Cho),윤석암(S.A Yoon) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.4
앞으로의 에너지 고유가 시대를 대비하여 수소의 생산에 대한 연구를 활발히 진행되어지고 있다. 여러 가지 수소를 생산하는 방법 중 본 연구에 사용되는 방법은 개질반응법으로써 스팀(수증기)개질 방식을 사용하는 1㎾용 개질시스템에 관한 연구이다. 본 장치는 천연가스를 이용하여 1m3/hr을 생산하는 수증기 개질시스템이다. 크게 세가지로 나누어 지는데, 첫째 시스템 제어부, 둘째 가스 및 물 공급부, 셋째 개질기이다. 본 연구에서는 이 개질 시스템의 운전 특성과 모니터링에 대해서 알아보고자 한다.