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Nylon tufted carpet과 Polyester tufted carpet의 내마모 성능 비교
윤현정(Hyunjeong Yoon),임영선(Youngsun Lim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Nylon tufted carpet has been applied on the floor carpet of vehicles for driver and passenger’s comfort. As the alternate material of nylon tufted carpet, polyester tufted carpet is introduced and the number of its application is increasing for the vehicle. Polyester tufted carpet is estimated as equivalent as a nylon tufted carpet on the appearance aspect, but the cost is comparatively competitive to the nylon tufted carpet. As it is required to evaluate the polyester tufted carpet at the material engineering perspective, abrasion resistance which is one of the important properties of floor application was studied. It is performed to set the specified weight of polyester tufted carpet, which secures the durability performance and meets the expectation of customer as long as the vehicle lifecycle. Accordingly, it is studied to compare and analyze of abrasion performance between nylon and polyester tufted carpet.
Polyester Thread 이용한 Color별 일광견뢰도 특성 연구
이정우(Jeongwoo Lee),안선영(Sunyoung Ahn),윤현정(Hyunjeong Yoon) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
Among the interior part of automotive, seat part takes biggest portion of interior that it is used as a way to attract customers. One of seat covering material is fabric which is a good material to attract customer with its soft texture and flexibility on expressing variety of colors. Raw material of automotive fabric is usually polyester. Polyester fabric is being dyed by dyestuff using piece dye technology. Piece dye is a method for easy and fast way to develop various colors on fabric, but it has weak point on colorfastness property. Even the colorfastness differs by each color variation. In this study, colorfastness characteristic of colors will be reviewed by using three primary colors(red, yellow, blue) which can produce any colors by combining themselves. Polyester thread, which is the base material of fabric, will be dyed by each three primary colors and test colorfastness resistance property in a various radiant exposure conditions to find colorfastness characteristics depending on color. The result may help the understanding of colorfastness behavior of colors.
낙동강수계 수질의 시·공간적 특성에 대한 통계학적 분석
서미진 ( Mijin Seo ),조창대 ( Changdae Cho ),임태효 ( Taehyo Im ),김상훈 ( Sanghun Kim ),윤현정 ( Hyunjeong Yoon ),김용석 ( Yongseok Kim ),김경훈 ( Gyeonghoon Kim ) 한국환경과학회 2019 한국환경과학회지 Vol.28 No.3
Water quality is characterized by various complex factors. Therefore, a systematic understanding of water quality trends is required to carry out a proper evaluation. In this study, we analyzed the spatio-temporal water quality characteristics of the Nakdong River using five-year data from 2012 to 2016. Data was collected on the pH, DO, BOD, COD, SS, TN, TP, TOC, WT, EC, NH<sub>3</sub>-N, NO<sub>3</sub>-N, PO<sub>4</sub>-P, Chl-a, rainfall, and total and fecal coliforms. A total of 38 water quality measurement stations, from Andong1 to Gupo, were considered. Statistical analyses including trend, cluster, and factor analyses were conducted to identify the dominant water quality components affecting the Nakdong River. The Nakdong River was spatially classified into three groups for up-stream (Andong1 to Sangju1), mid/up-stream (Donam to Dalseong), and mid/down-stream (Hwawonnaru to Gupo) data collection, and temporally into two groups for summer/fall (7~10), and the rest of the season (11~6) data. The water quality of the entire Nakdong River showed trends similar to the mid/down-stream section, which indicates the importance of water quality management in this section. Suspended solids, phosphorus, and coliform groups were established as important factors to be considered in the summer/fall season across the river, especially in the mid/down-stream section. Nitrogen and organic matter were identified as important factors to be considered in the rest of the season, especially in the mid/up-stream section. This study could help determine the water quality components that should be intensively monitored in the Nakdong River.