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진화론적 방법을 이용한 누설자속이 큰 부상용 전자석 설계
차귀수(Gueesoo Cha),임형우(Hyoungwoo Lim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.4
This paper shows the design of a levitation magnet for an OLED system which has a large air gap. Evolution strategy was adopted for the optimization of the magnet system. During the optimization process, interpolation of levitation force was used to reduce the computation time which was needed to calculate the levitation force. Object function for optimization was total weight of the magnet system
1세대 선재와 2세대 선재의 혼합 적층시 발생하는 전송전류 손실 특성
임형우(Hyoungwoo Lim),차귀수(Gueesoo Cha),이지광(Jikwang Lee),이희준(Heejoon Lee) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Reduce AC loss is very important in superconductor power machine. And HTS power application are needed an increment of current capacity. in this paper estimate AC loss effect and increase of current according tocomposition stack with 1G wire and 2G wire by measurement. A Method of composition stack are YBCO-BSCCO, YBCO-BSCCO-BSCCO-YBCO and BS CCO-YBCO-YBCO-BSCCO. also, test result compared analytic equation by Norries
Development of Solar Concentrator Cooling System
HeeJoon Lee(이희준),Gueesoo Cha(차귀수) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.7
태양광 모듈 효율의 증가를 위해 렌즈나 반사판 등을 이용한 집광 시스템 개발이 활발하게 진행되고 있으며, 집광장 치는 일반적으로 렌즈를 사용하거나 고집속비의 광학장치를 이용하여 태양광 추적형으로 설계하여 고집속화를 추구하고 있 다. 그러나 집속비에 비례하여 열로 소산되는 에너지 밀도가 증가하므로, 고집속에 따른 태양전지 온도상승에 의한 태양전지 효율 저하를 방지하기 위해 집광장치의 냉각에 유의해야 한다. 본 논문에서는 이러한 여러 가지 제약 조건을 피하여, 저가격의 반사형 광학장치를 이용한 경제적인 저집광형 태양광 모듈 시스템을 연구 개발하였다. 일반모듈에 저집광장치를 사용하여 태양광 모듈의 발전효율을 증대 시키면서 집광으로 인해 발 생하는 열을 냉각장치를 통해 방출하였다. 제안된 저집광형 냉각장치(MCS, Micro Cooling System)의 특징은 모세관력에 의한 자연 순환 방식으로서 외부 동력원이 불필요하며, 유체 상변환시의 잠열을 이용함으로써 고성능 냉각 구현이 가능하다. 117W 태양광 모듈에 반사판을 설치하고 냉각장치가 있는 모듈과 냉각장치가 없는 모듈을 비교 하였다. 냉각장치를 설치한 모듈에서의 발전량이 28% 증가하였다. To increase the efficiency of a solar module, the development of solar concentrator using a lens or reflection plate is being proceeded actively and the concentrator pursues the a concentration using a lens or an optical device of a concentration rate and designing as a solar tracking system. On the other hand, as the energy density being dissipated as a heat according to the concentration rate increases, the cares should be taken to cool the solar concentrator to prevent the lowering of efficiency of solar cell by the increasing temperature of the solar cell. This study, researched and developed an economical concentrator module system using a low priced reflection optical device. A concentrator was used as a general module to increase the generation efficiency of the solar module and heat generated was emitted by the concentration through the cooling system. To increase the efficiency of the solar concentrator, the cooling system was designed and manufactured. The features of the micro cooling system (MCS) are a natural circulation method by the capillary force, which does not require external power. By using the potential heat in the case of changing the fluid, it is available to realize high performance cooling. The 117W solar modules installed on the reflective plate and the cooling device in the cooling module and the module unit was not compared. The cooling device was installed in the module resulted in a 28% increase in power output.
자동차전장분야에서 팀활동과 직업기초능력과의 관련성 분석 연구
박성종(Sungjong Park),차귀수(Gueesoo Cha) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This study examines the relation between team work and key competencies for automotive electronics students. A project course strategy applying Project Based Learning(PjBL) was developed and 15weeks project class as teams of three to five in automotive specialized college was run. By completing their own task project and by recording their project process, team’s activities are assessed. As a result, it evidenced the difference of key competencies in the engineering technology education with a team work and an activity of the team leaders. The study shows that the team work and the activity of the team leaders on PjBL applied project class play a different role in sub-factors of key competencies such as inter-personal relation, understanding organization, self-management and development and information application.