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Ho-Joong Kim(김호중),Jin-Woo Jeon(전진우),Tuyet Nam Thi Nguyen,Seung-Man Hwang(황승만),Yong-Ho Cha(차용호),Sung-Deuk Choi(최성득),Chang-Gyun Kim(김창균) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/DFs) are generated unintentionally from anthropogenic emission sources such as power plants and incinerators, and various kinds of chlorinated chemical manufacturing processes such as metallurgy, pentachlorophenol, ethylene dichloride, and chloroalkyl. In the long-term nationwide Korea national POPs monitoring program, concentrations and emission of PCDD/DFs in the air had been decreased 70 % from 2009 to 2017 and 91% from 2001 to 2015, respectively. Despite these efforts, PCDD/DFs have been long-range transported all over the world due to their characteristics such as low water solubility, semi-volatility, bio-accumulation, and persistence. Especially, air and soil play a key role in the movement and storage of POPs in the environment by deposition and volatilization, evaluating their multimedia fate is essential to predict human health effects. This study focused on long-term fugacity flux based on seasonal variations and types of localities over a decade, as South Korea has a distinctive four seasons; spring, summer, fall, and winter, and various kinds of manufacturing industries. Total 1,083 of ambient air and soil samples at 21 sites where adjacent within 6 km of each other throughout the South Korea peninsula from 2008 to 2018 for PCDD/DFs. It is known that POPs could be re-volatilized from soil to ambient air as secondary pollution. The diffusive soil-air fluxes and soil-air fugacity fraction (ff) of each PCDD/DFs congeners were calculated for every four seasons. The ff is shown that temporal variation according to the number of chlorinations, congeners, and locality types. Furthermore, soil-air fugacity exchange flux over a decade shows that mainly equilibrium state but the tendency to deposition.
Poly(trimethylene terephthalate)/Cellulose 교편물의 전처리 및 염색에 관한 연구
정성훈,차용호,이권선,오태환,Jeong, Sung-Hoon,Cha, Yong-Ho,Lee, Kwon-Sun,Oh, Tae-Hwan 한국섬유공학회 2007 한국섬유공학회지 Vol.44 No.5
The effect of mercerizing, presetting and dyeing of single jersey poly(trimethylene terephthalate) (PTT)/cellulose knitted fabrics were carried out. Pre-treating, dyeing, and finishing conditions were optimized to make uniform PTT/Cellulose knitted fabrics. The optimum conditions of the PTT/Cellulose knitted fabrics for mercerization were 22.5 wt% NaOH, $20^{\circ}C$ and 23 m/min of tenter speed. A cold-pad-batch (CPB) dyeing method could minimize process problems of high tension and rubbing in comparison with an ordinary exhaust dyeing method. Fastness was the best when the fabric was dyed at temperature of $105^{\circ}C$ and for 40 min. We resolved a tailing problem of the CPB process by controlling tenter speed and temperature.