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한국지역 집중호우에 대한 반환주기의 베이지안 모형 분석
이정진,김남희,권혜지,김용구,Lee, Jeong Jin,Kim, Nam Hee,Kwon, Hye Ji,Kim, Yongku 한국통계학회 2014 응용통계연구 Vol.27 No.6
Understanding extreme precipitation events is very important for flood planning purposes. Especially, the r-year return level is a common measure of extreme events. In this paper, we present a spatial analysis of precipitation return level using hierarchical Bayesian modeling. For intensity, we model annual maximum daily precipitations and daily precipitation above a high threshold at 62 stations in Korea with generalized extreme value(GEV) and generalized Pareto distribution(GPD), respectively. The spatial dependence among return levels is incorporated to the model through a latent Gaussian process of the GEV and GPD model parameters. We apply the proposed model to precipitation data collected at 62 stations in Korea from 1973 to 2011. 집중호우의 특성을 이해하는 것은 수문관리 및 재해방재 등에서 매우 중요하다. 특히 반환주기는 이러한 집중호우의 특성을 나타내는 측정치로 자주 사용된다. 본 논문에서는 베이지안 계층적 모형을 이용하여 강우의 반환주기에 대한 공간구조를 분석하였다. 먼저 국내 62개 지점에서 측정한 강우 강도을 기초로 하여 연간 일일 최대강우량과 특정한 수준을 초과하는 강우량에 대해서 generalized extreme value(GEV)와 generalized Pareto distribution(GPD)를 각각 가정하여 추정하였다. 집중호우 반환주기에 대한 공간구조는 이 GEV 분포와 GPD 분포의 모수에 공간구조를 가지는 다변량 정규분포를 이용하여 설명하였다. 제안된 모형을 국내 76개 지역에서 39년간 측정된 일별 강우량 관측자료에 적용하였다.
플록 가공용 분할형 PET 극세 플록 섬유의 감량 및 염색 특성
이정진,남창우 한국섬유공학회 2019 한국섬유공학회지 Vol.56 No.1
In conventional manufacturing of flocking fabric, filament fibers are weightreduced, dyed, and cut to staple fibers of a certain length. Subsequently, these short flocking fibers, or piles, are flocked on a substrate. However, many weight-reduced and dyed flocking fibers are discarded because of inaccurate length during the cutting process. To overcome this inefficiency problem, a modified flocking process was proposed, in which the filament fibers are cut before the flocking fibers are weight-reduced, dyed, and flocked. In this study, the weight-reduction behavior and dyeing properties of split-type PET flocking microfibers produced by the modified flocking process were investigated. It was found that the weight-reduction ratio of the flocking fibers depends on temperature, time, and the concentration of sodium hydroxide solution used in the alkali treatment. The optimum treatment conditions (whereby the weight-reduction ratio reached a theoretically defined value) could be chosen, and the split flocking microfibers could be monitored by scanning electron microscopy (SEM) analysis. When the flocking microfibers were dyed with seven disperse dyes, the adsorption or dyeing rates of the low- and medium-energy-type disperse dyes were faster than those of the high-energy-type disperse dyes. The highenergy- type disperse dyes exhibited good color yield, which suggested that their build-up properties were good. The wash fastness was moderate to good, and the light fastness was fair to moderate; however, the rubbing fastness was very poor.