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이해영(Hae-Young Lee),김철호(Chul-Ho Kim),정재철(Jae-Chul Jung),이영조(Young-Jo Lee),장용무(Yong-Moo Chang),김정태(Jung-Tae Kim),구자윤(Ja-Yoon Koo) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.11
본 연구에서는 실규모의 초고압 방전실험 챔버를 이용하여 불평등 전계에 대한 SF?/N₂ 혼합가스의 절연파괴전압을 구하기 위한 연구를 수행하였다. 결과적으로 충격절연파괴 실험의 경우에 SF?/N₂ 혼합가스의 절연파괴 특성은 부극성이 정극성보다 낮은 절연파괴 전압을 갖는 것으로 확인 되었다. AC전압의 경우, 50㎜까지 전극 간격이 증가할수록 절연파괴 전압은 상승하였고 50㎜ 이후에서는 포화상태의 경향을 보였다. 본 연구결과는 가스 절연선로(GIL)의 설계에 유용한 정보가 될 것이다.
시공간 상관성을 고려한 일기산출기 모형을 이용한 4대강 유역별 미래 일기 변수 산출
이동환,이재용,오희석,이영조,Lee, Dong-Hwan,Lee, Jae-Yong,Oh, Hee-Seok,Lee, Young-Jo 한국통계학회 2012 응용통계연구 Vol.25 No.2
일기 산출기 모형은 가상의 일기 자료를 생성하는 통계 모형이다. 본 연구는 시공간 상관성이 고려된 다중지점에서의 일기산출 모형을 제안하고, 온실가스 배출 미래 시나리오에 따라 강수량과 평균 기온 일기산출이 가능한 알고리즘을 개발하였다. 제안된 알고리즘은 다단계 일반화 선형모형 하에서 필요한 모수들을 추정하고, 적합된 모형 하에서 일기변수들을 랜덤하게 산출하는 절차이다. 과거 30년간 관측된 우리나라 4대강 유역의 일 강수량 자료와 평균 기온 자료를 가지고 모형을 적합하고, 미래 일별 일기자료 산출에 적용하였다. Weather generators are statistical tools to produce synthetic sequences of daily weather variables. We propose the multisite weather generators with a spatio-temporal correlation based on hierarchical generalized linear models. We develop a computational algorithm to produce future weather variables that use three different types of green-house gases scenarios. We apply the proposed method to a daily time series of precipitation and average temperature for South Korea.
韓國人의 毛髮中 鉛含量에 關한 調査 : 농촌인, 도시인 및 鉛취급 근로자를 대상으로
裵恩相,朴龍周,新璣峻,李榮造,車喆煥 최신의학사 1977 最新醫學 Vol.20 No.9
The drastic industrial development triggered by the first five year. Development Plan has eventually given rise to an undesirable by-products “environmental pollution”. Among many pollutants, lead has been recognized as one of the most threatening heavy metals to human health. In view of the fact that few specific and simple method has ever been adopted in the field- of air pollution and occupational medicine for the measurement of the amount of lead accumulated in human tissue, the authors have made an effort to measure the level of lead content in human hairs by means of atomic absorption spectrophotometry. A sample of hairs was collected from four different groups of people, namely, automobile drivers, printing workers, residents of urban (mostly of Seoul) and rural areas. The salient features of the finding could be summarized as follows. 1. For the rural residents, the average lead content in hairs was found to be 3.1?g/g (male) and 0.8?g/g (female) in the age group of 15 years and less, 5.7?g/g (male) and 6.4?S/g (female) in the age group of 16-30 years, and 6.0? g /g (male) and 6.8?g /g (female) in ages over 31 years. 2. For the urban residents, mostly of Seoul, the lead content in hairs averaged 5.?g/g, and further details by sex and age are: 5.1?g/g (male) and 3.5?g/g (female) in the age group - of 15 years and less, 7.9?g/g (male) and 8.5? g/g female) in 16-30 years of age, 7.8?g/g (male) and 9.8? g /g (female) in ages of 31 years and over. 3. For the automobile drivers, the average lead content in hairs by years of driving careers turned out to be 8. l?g/g in 5 years or less group, 13.2?g/g in 6-10years group and 14.9?g/g in the group of 11 years and over of driving career. 4. The average for the printing workers was turned out to be 15.0?g/g. The further breakdown showed that the highest level of 18.9?g/g was observed from the- group of “type foundry”, 14.7?g/g from stereotype and 11.5?g/g from monotype workers. 5. For the group of 30-50 years of age, a remarkable difference could be observed according to the type of environment, that is, 6.0?g/g was turned out to be the mean for rural residents, 7.?g/g for urban residents, 13. 2?g/g for professional drivers of more than 6 years of service and 15.0?g/g for printing workers.