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Q-V Lissajous 방법을 이용한 Xe형 평판형 형광램프의 전기광학 특성 평가
김영엽(Young-Youb Kim),유미연(Mi-Yeon Yu),고재연(Jae-Hyeon Ko),유시홍(Si-Hong Ryu),이성의(Seong-Eui Lee) 한국조명·전기설비학회 2007 한국조명·전기설비학회 학술대회논문집 Vol.2007 No.11월
Electrooptic characteristics of Xe-type flat fluorescent lamps (FFL) have been investigated by using a Q-V Lissajous method. It was found that the luminance of the MgO-coated FFL became more than doubled compared to normal FFLs operated at the same driving voltage, indicating the possibility of the efficacy improvement in the MgO-coated FFLs. Change in the driving condition, in particular, the duty ratio had effects on the electrooptic properties, and it was found that the duty ratio of 50% was the optimum condition from the viewpoints of the efficacy and the lamp voltage.
공간의 국지적 탐색을 통한 공공도서관의 입지평가 및 최적입지 선정
김영엽(Kim, Young-Youb),여관현(Yeo, Kwan-Hyun) 한국주거환경학회 2014 주거환경(한국주거환경학회논문집) Vol.12 No.4
This study analyzes the spatial equity of provision of public libraries targeted on Seoul city as well as the locational efficiency and superiority. This study utilizes microscopic exploration techniques in order to compensate the defects left by preceding studies and to maximize the usability of the study results. According to results, public libraries in seoul covers 51.4% of the whole area and 70.4% of the overall population in the city in 2010. It is interesting that there is a deviation among sub-regions. They are 21 sub-regions including Gangnam, Gwanak and Songpa where relatively large number of the regions with location superiority are identified. This study explores microscopically spaces to help evaluate the spatial equity and efficiency of public libraries and as it provides timely proper study results. Conclusionally, this study is expected to provide some profound knowledge and information that can contribute to the policies concerning the provision of public libraries.