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Shewanella algae BrY 를 이용한 영가철 칼럼의 TCE 처리 수명연장
채희훈,배연욱,박재우 한국지반환경공학회 2007 한국지반환경공학회논문집 Vol.8 No.2
Zevo-valent iron (ZVI) has been widely used in permeable reactive barriers for reducing organic contaminants, such as trichloroethylene (TCE). The rapid reaction time, however, leads to decrease in reactivity and availability of ZVI. Shewanella algae BrY, a strain of dissimilatory iron reducing bacteria, can reduce the oxidized Fe (III) to Fe (II) and reduced Fe (II) can be reused to reduce the contaminant. The effect of Shewanella algae BrY on the reduction of the oxidized ZVI column and further TCE removal in the contaminated groundwater were studied at different flow rates and TCE input concentrations in this study. High input concentration of TCE and flow rate increase the amount of input contaminant and make to lower the effect of reduction by Shewanella algae BrY. Specially, the fast flow rate inhibits the direct contact and implantation on the surface of iron. The reduction of oxidized iron reactive barrier by Shewanella algae BrY can decrease the decreation of duration of PRBs by the precipitation of oxidized iron produced by dechlorination of TCE.
탈북민의 심리적 지원을 위한 집단상담 프로그램 스코핑 리뷰
김윤희,오성은,채희훈,임주희,신성만 한국콘텐츠학회 2023 한국콘텐츠학회논문지 Vol.23 No.11
This study analyzed 37 Korean literature on group counseling programs for North Korean defectors in South Korea through the scoping review method. Most programs were conducted during 2008-2012, mainly focused on adult defectors. Art therapy was the most common theory of the program, mainly developed on reducing negative emotions. Programs typically consisted of 10-15 sessions lasting 90-120 minutes each, with 5-10 participants. The results were classified by research method, program effectiveness, and limitations in program operation. With these results, we identified the necessity of multifaceted support for psychological difficulties, research for male defectors based on evidence-based theories as well as strength-based approaches, and the development of the small-scale modular group counseling program. In addition, in future studies, the establishment of a program direction according to the characteristics of research subjects, diversification of research effect measuring method, consideration of socio-demographic characteristics, and reflection of practitioner’s opinion when developing and operating the program will be needed.
조은혜,윤성호,황선경,이성종,김홍석,채희훈,Jho, Eun Hea,Yun, Seong Ho,Hwang, Sun Kyung,Lee, Sung Jong,Kim, Hongseok,Chae, Heehun 한국지하수토양환경학회 2017 지하수토양환경 Vol.22 No.5
Contaminated sediment can be treated in order to reuse the treated sediment. Even though the chemical criteria are satisfied, the treated sediment could still impose toxic effects. Therefore, this study investigated the changes in the ecological toxic effects of the contaminated sediment from the J region in Singapore after treatment. The contaminated sediment was subject to sequential soil washing and thermal treatment, followed by pH neutralization. Toxic effects of the contaminated and treated sediments were determined by using Vibrio fischeri ($Microtox^{(R)}$), Triticum aestivum (wheat), and Eisenia foetida (earthworm). After treatment, the concentrations of total petroleum hydrocarbons and heavy metals were decreased by 98% and 59-93%, respectively, and satisfied the Industrial Maximum Values of the Dutch Standard, which were used as the remedial goal. The bioluminescence reduction of V. fischeri decreased significantly, and the earthworm survival increased from 0% to 90% after treatment. The germination rate increased from $0{\pm}0%$ to $75{\pm}13%$ after treatment, but the treated sediment may need additional treatment such as nutrient addition for better plant growth. Overall, this study showed that the treatment of the contaminated sediment satisfactorily removed mixed contaminants, and this led to reduction in toxic effects, suggesting improved potentials for reuse of the treated sediment.