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Optoelectronic Characteristics of Transparent Cu₂O Films Spin-coated on Glass Substrates
곽기열(Kiyeol Kwak),조경아(Kyoungah Cho),김상식(Sangsig Kim) 대한전기학회 2010 전기학회논문지 Vol.59 No.1
Cu₂O nanoparticles-based films are fabricated by spin-coating on glass substrates and their optoelectronic characteristics are investigated in this study. The Cu₂O films are nearly all-transparent as high as 98% in a wavelength range from 400 ㎚ to 900 ㎚ and three exciton peaks associated with the sublevels in the conduction band are observed at the wavelengths shorter than 400 ㎚ in the absorption spectrum. Under the illumination of the 325 ㎚ wavelength light, the photocurrent efficiency of the Cu₂O film is 1.8×10? ㎂/W at a voltage of 2.5 V in air.
신 장애물제한표면에 관한 이론적 고찰과 실증분석 - 인천국제공항을 중심으로 -
최상일,유수정,곽기열,김현미,김휘양,Choi, Sangil,Yu, Soojeong,Kwak, Kiyeol,Kim, Hyeonmi,Kim, Huiyang 한국항공운항학회 2022 한국항공운항학회지 Vol.30 No.3
Obstacle Limitation Surface (OLS) is conceptual surface establishing the airspace around aerodromes to be maintained from obstacles to ensure safe aircraft operations. Despite advances in the technologies for aircraft, navigation systems and the development of new flight procedures, the criteria defining OLS have not been amended since its initial establishment, resulting in the overestimation of areas for height restriction. As there were requests to examine OLS at the 12th Air Navigation Conference and the 38th ICAO Assembly, the research on the OLS revision began in earnest and ICAO has proposed Obstacle Free Surface (OFS) and Obstacle Evaluation Surface (OES) as an alternative of the existing OLS. OFS is surfaces where obstacles shall not be permitted, and OES is ones where obstacles be evaluated with an aeronautical study and could be permitted under some conditions. The purpose of this study is to preemptively assess the efficiency and safety of OFS and OES by applying them to the second runway (15L/33R) of Incheon International Airport. The results show that OFS and OES are capable of serving the instrument flight procedure safely with a smaller obstacle clearance area compared to the existing OLS.
전기방사법으로 제작된 ZnS:Mn/PVP 하이브리드 나노사의 발광특성
김광은(Kwangeun Kim),조경아(Kyoungah Cho),곽기열(Kiyeol Kwak),윤창준(Changjoon Yoon),김상식(Sangsig Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
ZnS:Mn 나노입자가 포함된 PVP 고분자 하이브리드 나노사를 전기방사법으로 제작하였다. 하이브리드 나노사의 표면 특성은 주사 전자 현미경으로 관측하였으며, 형광분광광도계와 공초점 주사 현미경 (CLSM)을 이용하여 하이브리드 나노사의 발광특성을 조사하였다. 순수한 PVP 나노사와 하이브리드 나노사의 photoluminescence (PL) 스펙트럼 비교를 통하여, 586 ㎚에서 관찰된 PL 피크는 ZnS:Mn 나노입자에서 기인되었음을 알 수 있었으며, CLSM을 이용하여 ZnS:Mn 나노입자의 발광을 이미지화 하였다.