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고장 분석과 가속 수명시험을 통한 PTC 히터의 신뢰성 평가
최형석,Choi, Hyoung-Seuk 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.12
In this paper, the failure mechanism of PTC heater were examined closely by failure analysis and based on it, accelerated life test were conducted. Finally, life distribution and acceleration model were established. The failure mechanism of PTC heater such as crack, increase of resistance due to heating were identified. Two acceleration factors such as temperature, humidity were chosen with two levels each and accelerated life test were done. Life distribution were identified as Weibull distribution with shape parameter 5.4 and Temperature-Humidity model was fitted as an acceleration model.
광학응용 CaF<sub>2</sub> 단결정성장을 위한 열역학적 공정설계
정성민 ( Seong-min Jeong ),전해진 ( Hae-jin Jeon ),신윤지 ( Yun-ji Shin ),최형석 ( Hyoung-seuk Choi ),배시영 ( Si-young Bae ) 한국전기전자재료학회 2023 전기전자재료학회논문지 Vol.36 No.2
Calcium fluoride (CaF<sub>2</sub>) single crystal is applied to numerous industrial applications, especially for optical uses. To have excellent optical transmission properties, however, CaF<sub>2</sub> crystals should be carefully fabricated through liquid-phase crystal growth techniques. In this study, as one of the early stage research activities to grow CaF<sub>2</sub> crystals with a good transmittance at the ultraviolet wavelength range, computational thermodynamic models were provided to deepen the understanding of the crystal growing processes of CaF<sub>2</sub> under various conditions. To remove point defects and oxygen impurities in the grown CaF<sub>2</sub> crystals, the system was thermodynamically evaluated to get optimal process conditions. From the reviews of previous experimental studies, computational thermodynamic approaches were found to be an effective and powerful tool to understand the meaning of the crystal growth processes and to obtain optimal process conditions.