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열전도성 플라스틱을 적용한 자동차 LED 전조등 방열구조 연구
김형진,이동규,박현정,양회석,나필선,곽준섭,Kim, Hyeong Jin,Lee, Dong Kyu,Park, Hyun Jung,Yang, Hoe Seok,Na, Pil Sun,Kwak, Joon Seop 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.8
Since LEDs (light emitting diodes) have many advantages as a light source in vehicle headlamp, such as good reliability, energy and space saving, and flexible headlamp design. On the other hand, the dependence of its performance and life on temperature have great influence on its practical use. In this study, design and fabrication of heat sink for vehicle LED headlamp were performed using thermally-conductive plastics. This study focused on the effective heat sink structure with limited space in the vehicle LED headlamp. We designed two different prototype of heat sink by thermal simulation using SolidWorks program, which had excellent temperature characteristics. The two different prototype of heat sink were fabricated by injection molding with thermally-conductive plastics. The results showed that LED $T_j$ (junction temperature) of sample B (model 1) and sample C (model 1, 2) was below then $165^{\circ}C$ when applying the thermally-conductive plastics in heat sink of vehicle LED headlamp.
실리콘 미세 가공을 이용한 열전형 미소유량센서 제작 및 특성
이영화 ( Young Hwa Lee ),노성철 ( Sung Cheoul Roh ),나필선 ( Pil Sun Na ),김국진 ( Kook Jin Kim ),이광철 ( Kwang Chul Lee ),최용문 ( Yong Moon Choi ),박세일 ( Se Il Park ),임영언 ( Young Eon Ihm ) 한국센서학회 2005 센서학회지 Vol.14 No.1
A thermoelectric flow sensor for small quantity of gas flow rate was fabricated using silicon wafer semiconductor process and bulk micromachining technology. Evanohm R alloy heater and chromel-constantan thermocouples were used as a generation heat unit and sensing parts, respectively. The heater and thermocouples are thermally isolated on the Si₃N₄/ SiO₂/Si₃N₄ laminated membrane. The characteristics of this sensor were observed in the flow rate range from 0.2 slm to 1.0 slm and the heater power from 0.72 mW to 5.63 mW. The results showed that the sensitivities ((??(ΔV)/??(q)); AV : voltage difference, 4 : flow rate) were increased in accordance with heater power rise and decreasing of flow rate.