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Freestanding GaN 기판의 Ga-polar 면에 기계적 연마 방법을 적용한 Bow 제어 및 그 특성 연구
김진원,손호기,임태영,이미재,김진호,전대우,황종희,정정영,오해곤,김진훈,최영준,이혜용,윤대호,Gim, Jinwon,Son, Hoki,Lim, Tae-Young,Lee, Mijai,Kim, Jin-Ho,Jeon, Dae-Woo,Hwang, Jonghee,Jung, Jung-Young,Oh, Hae-Kon,Kim, Jin-Hun,Choi, YoungJun,Le 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.12
In this paper, we have studied the effect of mechanical polishing to Ga-polar face for reducing the wafer bowing and strain in free-standing GaN. After the mechanical polishing to Ga-polar face, the bowing of the free-standing GaN substrate significantly decreased with increasing the size of diamond slurry, and eventually changed the bowing direction from concave to convex. Furthermore, the full width at half maximum (FWHM) of high-resolution X-ray diffraction (HR-XRD) were decreased, especially the FWHM of (1 0 2) reflection for $1.0{\mu}m$ size of diamond slurry was significantly decreased from 630 to 203 arcsec. In the case, we confirmed that the compressive strain in Ga-polar face was fully released by Raman measurement.
N-polar면의 선택적 에칭 방법을 통한 Free-standing GaN 기판의 Bowing 제어
김진원,손호기,임태영,이미재,김진호,이영진,전대우,황종희,이혜용,윤대호,Gim, Jinwon,Son, Hoki,Lim, Tea-Young,Lee, Mijai,Kim, Jin-Ho,Lee, Young Jin,Jeon, Dae-Woo,Hwang, Jonghee,Lee, Hae-Yong,Yoon, Dae-Ho 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.1
In this paper, we report that selective etching on N-polar face by EC (electro-chemical)-etching effect on the reduction of bowing and strain of FS (free-standing)-GaN substrates. We applied the EC-etching to concave and convex type of FS-GaN substrates. After the EC-etching for FS-GaN, nano porous structure was formed on N-polar face of concave and convex type of FS-GaN. Consequently, the bowing in the convex type of FS-GaN substrate was decreased but the bowing in the concave type of FS-GaN substrate was increased. Furthermore, the FWHM (full width at half maximum) of (1 0 2) reflection for the convex type of FS-GaN was significantly decreased from 601 to 259 arcsec. In the case, we confirmed that the EC-etching method was very effective to reduce the bowing in the convex type of FS-GaN and the compressive stress in N-polar face of convex type of FS-GaN was fully released by Raman measurement.
김진원,이호성,Kim, Jinwon,Lee, Hosung 항공우주시스템공학회 2016 항공우주시스템공학회지 Vol.10 No.1
This study shows the statistical properties of the domestic composite material prepregs test result. During the last three years(2012.5~2015.6) the prepreg specimen tests have been performed by referring to NCAMP developed test procedure which was approved by FAA. The database of (1) Carbon Tape, (2) Glass Fabric, and (3) Carbon Fabric composite material prepregs' characteristics have been established for certified aircraft structures. This qualified materials can be used for aircraft structural design through proper material equivalency procedures.
김진원(Jinwon Kim),류동영(Dongyoung Rew) 한국항공우주연구원 2020 항공우주산업기술동향 Vol.18 No.1
월면 탐사를 위한 해외 우주 선진국들의 노력은 1960년대 이후로 꾸준히 전개되고 있다. 월면 탐사시 우주의 극한 상황을 고려하면 무인 탐사 로버의 체계적인 개발 및 운용은 매우 중요하다. 그간 로버를 달 탐사선에 탑재하고 전개하는 작업은 미국, 소련, 중국 등 3개국에서 성공적으로 실현되었으며, 본 연구에서는 향후 달탐사 로버를 성공적으로 월면에 내려놓기 위한 세 가지의 방식 (1) 측면 탑재 방식 (2) Roof-top 탑재 방식 (3) 승강 방식을 해외의 성공적인 로버 전개 사례연구를 포함하여 분석하였다. The efforts of leading space-exploration countries for lunar exploration have been continued since the 1960s. Considering the extreme conditions of the lunar exploration, the systematic development and operations of unmanned rovers are very important. Efforts to mount and deploy a rover on the lunar surface have been successfully performed in three countries such as USSR, US, and China. In this study, three lunar rover deployment methods (1) side unloading, (2) roof-top unloading, and (3) cargo elevation methods were investigated along with the case studies of previous successful rover deploying lunar missions.
작동 온도 영역이 확장된 제올라이트계 SCR 촉매 개발
김진원(Jinwon Kim),한재욱(Jaeuk Han),임윤택(Yuntaek Lim),김은석(Eunseok Kim),한현식(Hyunsik Han) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Selective catalytic reduction of NOx by NH₃(NH₃-SCR) is widely applied in the treatment of NOx emissions form diesel vehicles. Zeolite-based SCR catalysts have been widely studied and used for NH3-SCR due to the high NO conversions that can be obtained in relatively wide temperature windows. This paper had been conducted to investigate the NOx reduction activity of SCR using combination of catalyst. Temperature range of catalytic activity has been changed with changing Cu status in Cu-ion exchange catalyst. Fe-ion exchange catalyst that showed good activity at high temperature. Two kinds of catalyst had combined for increasing catalytic activity at whole range. In case of Cu-C & Fe-C combination catalysts, Fe-C catalyst at front position and Cu-C at rear position system showed good activity at whole range. The best activity showed at Fe/Cu-A and Fe/Cu-B. Considering N2O formation, Cu & Fe combination catalyst had showed better performance than Cu only catalyst.