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200W급 COB LED를 적용한 방열 엔진 설계 및 최적화
서우진(Woo-Jin Seo),유영문(Young-Moon Yu),최희락(Hee-Lack Choi) 한국조명·전기설비학회 2018 조명·전기설비학회논문지 Vol.32 No.2
In this paper, to replace high power luminaire of halogen lamp, heat - dissipating engine for 200W COB LED was studied. In order to solve the heat dissipation problem of high flux and high power LED luminaire thermal design and analysis were studied equipped with heat pipe and cooling fan. Thermal design using heat pipes and cooling fans reduced weight by 24% than aluminum heat sink. When the number of heat pipes and dissipation fins were 8 and 53, respectively, heat dissipation performance can lower the maximum surface temperature to 67.0℃. The required flow rate satisfying the heat dissipation performance was calculated by controlling the speeds of the upper and the lower cooling fan separately, and it was found that the maximum surface temperature can be cooled to 65.2℃ under the optimum control condition.
히트 스프레더의 작동유체 충진율에 따른 열전달 성능에 관한 연구
강민규(Min-Gyu Kang),서우진(Woo-Jin Seo),허인성(In-Sung Her),유영문(Young Moon Yu),최희락(Hee-Lack Choi) 한국조명·전기설비학회 2017 조명·전기설비학회논문지 Vol.31 No.2
In this paper, the effect of thermal transfer depending on the filling ratio of working fluid in heat spreader was studied. The heat spreaders were filled with working fluid (acetone) rate of 0%, 5%, 15% and 40%, respectively. The temperature distribution according to the thermal transfer direction was measured. Finally the thermal transfer was analyzed for four different filling rates of working fluid and four different LED COB input powers of 5W, 10W, 15W, 20W. Then, the thermal resistivity and thermal transfer coefficients of heat spreaders were calculated. In result, it was found that heat spreader with 15% of filling rate was most effective in terms of the thermal transfer property, which are 0.49∼0.64K/W of thermal resistivity and 2071∼2719W/㎡K of thermal transfer coefficient.
김한솔(Han-Sol Kim),문우성(Woo-Sung Moon),서우진(Woo-Jin Seo),백광렬(Kwang-Ryul Baek) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.4
Geomagnetic is refracted by building’s wall and pillar. Therefore refracted geomagnetic is able to be used as feature point. In a specific space, a mobile device that is equipped with magnetic sensor array measures 3-axis magnetic field for each point. Magnetic field map is acquired by collecting the every sample point in the magnetic field. The measured magnetic field must be calibrated, because each magnetic sensor has a distortion. For this reason, sensor distortion model and sensor calibration method are proposed in this paper. Magnetic field that is measured by mobile device matches magnetic field map. Result of the matching is used for position estimation. This paper implements hardware system for position estimation method using magnetic field map.