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스핀 도핑을 이용한 단결정 실리콘 태양전지 확산 공정 최적화
여인환,박주억,김준희,조해성,임동건,Yeo, In Hwan,Park, Ju Eok,Kim, Jun Hee,Cho, Hae Sung,Lim, Donggun 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.5
Rapid thermal processing (RTP) abruptly decreases the time required to perform solar cell processes. RTP were used to form emitter of crystalline silicon solar cells. The emitter sheet resistance is studied as a function of time and temperature. The objective of this study is reduction of doping process time with same performance. Emitter difRapid thermal dfusion was carried out by using a spin on doping and a RTP. iffusion was performed in the temperature range of $700{\sim}750^{\circ}C$ for 1m 30s~15 m. Thermal budgets yielded a $50{\Omega}/sq$ emitter using a P509 source. To reduce process time and get high efficiency, rapid thermal diffusion by IR lamp was employed in air atmosphere at $700^{\circ}C$ for 15 m.
에어로젤 복합 무기질 블랭킷과 석고보드를 피복한 고강도콘크리트 기둥의 내화성능
여인환,Yeo,In Hwan 한국방재학회 2012 한국방재학회논문집 Vol.12 No.6
본 연구는 에어로젤 복합 무기질 블랭킷과 석고보드를 이용한 고강도콘크리트 기둥 피복시스템 개발 및 그 성능 평가를 목적으로 하였다. ACB(에어로젤 복합 무기질 블랭킷)-FGB(방화석고보드)피복시스템은 기둥 네 모서리 부분의 변형이나 탈락이 없도록 보강되면 구조체의 내화성능을 충분히 확보할 수 있음이 확인됐다. ACB(5 mm)+FGB(15 mm)구성의 20 mm 피복으로 3시간 내화성능이 확보될 수 있음을 확인하였는데, 이 피복시스템은 동등 성능의 기존 석고보드 내화피복의 50-70% 두께 수준이다. This study aimed to develop and evaluate of fire resistant covering systems for HSC(high-strength concrete) column which has mainly constructed with ACB(Aerogel Composite inorganic Blanket) and FGB(Fire protective Gypsum Board). The ACB-FGB fire resistant covering system showed that it clearly secure the fire resistance performance for HSC column when the reinforcing measures had achieved for four cross-sectional edge sides of member and the system is well continued during test period with no significant deformation or seperation. It was checked out the 20 mm thinkness covering system consist of ACB(5 mm)+FGB(15 mm) can have a rating of 3 hour-fire resistance performance adequately; 20 mm thinkness is only 50-70% level of exsisting gypsum board covering systems that can show an equivalent capacity.
화재피해를 입은 철근콘크리트 기둥의 잔존강도 추정 및 내화성능 요인 분석
여인환,Yeo. In Hwan 한국방재학회 2013 한국방재학회논문집 Vol.13 No.6
본 연구에서는 화재피해를 입은 철근콘크리트 기둥을 대상으로 실험 및 해석적 방법에 의해 잔존강도를 추정하고 내화성능에 영향을 미치는 요인을 분석하였다. 철근콘크리트 기둥의 강도저감율과 내화성능 예측을 위해 간편 계산모델인 EN 1992-1-2의 <TEX>$500^{\circ}C$</TEX> 등온선법을 이용하였다. 철근콘크리트 기둥은 순수 축압축력을 받는 것으로 가정하고 표준 내화실험으로부터 얻은 기둥 내부 온도자료를 활용하여 표준화재에 180분간 노출된 철근콘크리트 기둥의 잔존강도율을 산출하였다. 아울러 콘크리트 강도, 피복두께, 단면크기, 잔존 유효단면적 등 철근콘크리트 부재 내화성능 영향요인의 상관관계를 분석하였다. 본 연구를 통해 추정한 철근 콘크리트 기둥의 잔존강도율은 내화성능설계를 위한 계수하중 설정 및 하중비 설정에 중요하게 활용될 수 있을 것으로 사료된다. This study aims to estimate the residual strength by experimental and analytic method and analyze the elements affecting fire resistant performance of reinfored concrete column. For predicting strength reduction rate and fire resistant rate of reinforced concrete column <TEX>$500^{\circ}C$</TEX> isotherm method of EN 1992-1-2, a simplified calculation method, was used. The residual strength rate of reinforced concrete column, which is exposed to standard fire for 180 minute and assumed to bear the pure axial compressive force, was calculated with inner temperature data achieved from fire resistance test results. Further, the analysis of relations of fire resistance rate affecting elements for reinforced concrete member were performed. The residual strength rate of reinforced concrete column estimated in this study may be used as a significant information for establishing fire load factor and load ratio on performance based fire resistant design.
알카리 식각과 반응성 이온 식각을 이용한 결정질 실리콘 2단계 표면 조직화 공정
여인환,박주억,김준희,조해성,임동건,Yeo, In Hwan,Park, Ju Eok,Kim, Jun Hee,Cho, Hae Sung,Lim, Donggun 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.2
Lowering surface reflectance of silicon wafer by texturization is one of the most important processes to improve the efficiency of silicon solar cells. Generally, the texturing of crystalline silicon was carried out using alkaline solution. The average reflectance of this method was 11% at the wavelength between 400 and 1,000 nm. In this study, the wafers were first texturing by NaOH solution at $80^{\circ}C$ for 35 min. Then the wafers were texturing by $SF_6$ and $O_2$ plasma in RIE (Reactive Ion Etching). The average reflectance of two step texturing was reduced to below 5% at the wavelength between 400 and 1,000 nm.
Collateral effect of the COVID-19 pandemic on emergency department visits in Korea
여인환,김종근,( Byunghyuk Yu ),( Kang-suk Seo ),( Jung-bae Park ),( Yeonjoo Cho ),( Jae Young Choe ),( Changho Kim ),( Yun Jeong Kim ),( Dong Eun Lee ),( In Hwan Yeo ),( Won-kee Lee ) 대한응급의학회 2022 대한응급의학회 학술대회초록집 Vol.2022 No.2
여인환,Yeo. In Hwan 한국방재학회 2012 한국방재학회논문집 Vol.12 No.6
본 연구는 현재 법정내화구조로 규정되어 있는 철근콘크리트조, 철골철근콘크리트조 및 철골철망모르타르조 슬래브에 대하여 재하조건에서의 내화성능을 검토함으로써 관련 규정의 분류체계 개선을 위한 자료 구축을 목적으로 하였다. 실험결과를 요약하면 다음과 같다. (1) 피복두께 40 mm의 경우 철근콘크리트조, 철골철근콘크리트조, 철골철망모르타르조의 변형량은 허용기준 대비 40~44%, 피복두께 50 mm의 경우는 34~37%로 유사한 수준의 내화성능을 보이는 것으로 나타나, 동일 피복의 경우 구조형식에 따른 내화성능 차이는 크지 않은 것을 확인하였다. 다만 근소한 차이로 철근콘크리트조, 철골철근콘크리트조, 철골철망모르타르조의 순으로 내화성능이 우수한 것으로 나타났다. (2) 슬래브 피복두께가 10 mm 증가하면 철골철근콘크리트조의 경우 8%, 철골철망모르타르조의 경우는 7%의 내화성능이 향상되는 것으로 나타났다. 이로써 슬래브의 내화성능은 피복두께와 전체 두께에 비례하여 증가하며, 구조형식의 영향은 거의 없는 것을 확인하였다. (3) 슬래브의 차열성능은 구조형식이나 피복두께의 영향보다는 전체 두께가 증가할수록 향상되었다. 하지만 슬래브 두께 200 mm이상에서는 두께가 증가하여도 차열성능에 미치는 영향이 없는 것으로 나타났다. This study aimed to secure the test data for improving the classification scheme of related regulations about fire resistant slabs by testing the structural member of RC, SRC and SWM slabs which legally prescriptived. Test result may be summerised as follows. (1) In the equal thickness condiion of covering, the deflection of specimen of RC, SRC and SWM showed to have equivalent performance at the rate of 40~44% in the case of 40 mm, 34~37% of 50 mm to the proportion of allowed criteria. It can be placed in order, however, RC, SRC and SWM as a view of fire resisting rate. (2) An increase of 10mm cover thickness of slab lead to the fire resisting rate up to 8% and 7% in SRC and SWM, respectively. This showed that the fire resisting rate increases in proportion to the cover and whole thickness, with few influenced by structural type. (3) The insulation performance of slabs improved by increasing whole thickness, with few influenced by structural type or covering thickness, but in the case of over the 200 mm of thickness of slab it was not further improved.
여인환(Yeo In-Hwan),인기호(In ki-Ho) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
Fire compartmentation is a useful method for prevent from fire spreading in aspect of architectural solution. Many kinds of openings derived from plumbing and duct systems or doors, which has relatively large opening, at fire compartmentation may be a passageway of fire penetrating and spreading. According to the architectural regulations they must install a fire door at gate way on fire compartmentation and a fire shutter at special places where difficult to be a ordinary compartmentation. In this study, the status of the fire safety codes for the fire shutters and fire doors as mainly dealed with recently revised contents of 'Performance Criteria of Fire shutters and Fire doors', Notice No. 2009-274 of Ministry of Land, Transfortation and Maritime Affairs are considered and the improving ways are proposed. The revised main contents are 1) supplementation of performance criteria, 2) establishing a basis of qualification of test body and applicant, 3) individual testing of main elements of fire shutters and fire doors, 4) extension of the validity term of test report.