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In vitro Mammalian Chromosomal Aberration Test of Fullerene-C60
Soo Jin Kim(김수진),Kyung Taek Rim(임경택),Hae Won Cho(조해원),Jeong Hee Han(한정희),Hyeon Yeong Kim(김현영),Jeong Sun Yang(양정선) 환경독성보건학회 2009 환경독성보건학회지 Vol.24 No.1
Fullerene의 유전독성을 평가하기 위하여 Chinese hamster유래의 난소유아세포(CHO-K1 cell)를 이용하여 직접법(-S9)과 대사활성화법(+S9 mix)의 염색체이상시험을 실시하였다. 시험물질은 1% CMC 나트륨염의 현탁액(l% CMC 용액)에 희석하여 조제하였다. 대사활성화를 시키지 않은 직접법의 염색체이상시험에서 24시간 투여군은 8단계의 농도(0.078, 0.156, 0.313, 0.625, 1.25, 2.5, 5, 10mM)로 투여하여 실시하였다. 투여 농도 증가에 따른 염색체이상의 빈도가 증가하는 양상이 나타나지 않았다. 48시간의 투여군에서는 8단계의 농도(0.078, 0.156, 0.313, 0.625, 1.25, 2.5, 5, 10mM)로 투여하여 실시하였는데 투여 농도 증가에 따른 염색체이상의 빈도가 증가하는 양상이 나타나지 않았다. 배수체의 염색체이상은 직접법에서 관찰되지 않았다. 대사활성화법을 이용하여 6시간 시험물질을 투여한 시험에 있어서는 8단계의 용량단계 (0.078, 0.156, 0.313, 0.625, 1.25, 2.5, 5, 10mM)를 설정하였는데 투여 농도가 증가함에 따른 염색체이상빈도의 증가양상이 관찰되지 않았다. 이상의 결과를 종합할 때 본 시험물질은 본 시험 조건하에서 CHO-K1세포에서 대사활성화를 시켰을 때 염색체 이상을 유발하지 않는 것으로 판단된다.
2-부탄티올의 SD Rats를 이용한 아만성 흡입독성연구
김현영 ( Hyeon Yeong Kim ),이성배 ( Sung Bae Lee ),임철홍 ( Cheol Hong Lim ),조해원 ( Hae Won Cho ),강민구 ( Min Gu Kang ),이준연 ( Jun Yeon Lee ) 한국산업위생학회 2007 한국산업보건학회지 Vol.17 No.3
With the 2-Butanethiol, which is an unidentified inhalation toxic material, acute inhalation toxicity was tested with SD rats. The LC50 was evaluated to be 2,500 ppm (9.22 mg/L) or higher which falls under the criteria of acute toxicity Category 3 (500<LC50<2,500 ppm) in the Industrial Safety and Health Act. In the subchronical inhalation toxicity test by 0, 25, 100, and 400 ppm, 6 hours a day, 5 days a week, for 13 weeks repeated exposure, though no death or particular clinical presentation was observed, in the female 25 and 400 ppm group, including weight change, and in each concentration group including 400 ppm, change of feed rate, eye stimulation, motility change in male group, and lesions in blood and blood biochemical were observed. In the internal organs weight, 25, 100, and 400 ppm groups in male and 400 ppm group in female showed significant (p<0.05) changes in kidney, liver, thymus, and lung. In the pathological tissue test, severe cortical tubular hyaline droplets were observed in the male 400 ppm group, and all male rats of 400 ppm group and 2 female individuals showed tubular degeneration/regeneration accompanied with pigmentation, showing that the target organs of inhalation exposure of 2-Butanethiol are spleen, kidney, nasal cavity, and adrenal. Through the tests, the NOEL of 2-Butanethiol was evaluated to be 25 ppm (0.092 mg/L) or less for both male and female.
김영민(Young-Min Kim),신승준(Seung-Jun Shin),조해원(Hae-Won Cho) 대한산업공학회 2020 대한산업공학회지 Vol.46 No.2
Machining power is a critical indicator for energy-efficient machining because it influences energy consumed during machine tool’s operations. Previous studies have derived predictive models that figured out the relationship between process parameters and machining power and help decide process parameters contributory to energy reduction. These studies mainly use machine learning approaches, which rely on learning datasets. However, real fields cannot always provide learning datasets due to the difficulty of data collection and thus such traditional approaches cannot work in a data scarce environment. The present work proposes a transfer learning-driven approach of predictive modeling for machining power. The proposed approach can create machining power prediction models in the data scarce environment through knowledge transfer of prior machining contexts to the target machining context. The present work includes a case study to demonstrate the validity of the proposed approach. The case study shows that machining power prediction models for titanium material of which machining power has been unlabeled can be created from those models for steel and aluminum materials of which machining power was labeled.