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김지웅(Chi-Ung Kim),박길배(Kil-Bae Park),이강운(Kang-Wun Lee),우관제(Kwan-Je Woo) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
Maglev train system has been continuously received attention as it provides good ride quality and low noise and vibration level. Furthermore it is an eco-friendly transport system with little dust pollutant. However the dynamic performance of the vehicle has been influenced by the track layout and the structural stability of guideways and girders etc. Especially the levitation control of magnetic module is the most important performance of the Maglev system and is very sensitive about the control algorithm and the parameters of the controller. In this paper the co-simulation of the control and dynamic model has been proposed and the simulation results for the running simulation on the curve track has been shown.
Baek, Seung-Hwa,Kang, Kil-Ung,Chung, Soon-Ryang,Kim, Hyung-Min,Chung, Woo-Young,Han, Du-Seok Kyung Hee Oriental Medicine Research Center 2000 International journal of oriental medicine Vol.1 No.1
Cannabidiol derivatives (1, 2 and 3), and 5-fluorouracil (4, 5-FU) were tested for their growth inhibitory effects against human oral epitheloid carcinoma cell lines (KB) using two different 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) assay and sulforhodamine B protein (SRB) assay. These compounds showed a potent inhibitory activity in vitro in the micromolar range against KB cell lines. In general, the antitumor activity of these compounds (1, 2, 3 and 4) was in a dose-dependent over the micromolar concentration ranges from $1\;{\mu}M\;to\;100\;{\mu}M$. The comparison of $IC_{50}$ values of these compounds in tumor cell lines shows that their susceptibility to these compounds decreases in the following order: CBD > 5-FU > CBDME > CBDDE by the MTT assay and SRB assay. Cannabidiol derivatives (1, 2 and 3), and 5-FU were tested for their cytotoxic effects on NIH 3T3 fibroblasts using two different MTT assay and SRB assay. These compounds exhibited potent cytotoxic activities in vitro in the micromolar range against NIH 3T3 fibroblasts. In general, the cytotoxic activities of these compounds (1, 2, 3 and 4) were in a dose-dependent over the micromolar concentration range $1\;{\mu}M\;to\;100\;{\mu}M$. The comparison of $CD_{50}$ values of these compounds on NIH 3T3 fibroblasts shows that their susceptibility to these compounds decreases in the following order; CBD > 5-FU > CBDDE > CBDME by MTT assay, CBD > 5-FU > CBDME > CBDDE by SRB assay. These results suggest that cannabidiol (1, CBD) retains the most growth-inhibitory activity against KB cell lines.
이정호,강길웅,유일수,김종수,최은영,나영순,백승화 圓光大學校 基礎自然科學硏究所 2000 基礎科學硏究誌 Vol.18 No.1
본 연구는 어성초의 물 추출물을 이용해서 카드뮴의 독성에 대한 해독 경감효과를 알아보고자 하였다. 그 결과는 어성초 물 추출물의 투여 용량이 증가할 수록 흰쥐 신장과 간장에서 카드뮴에 대한 해독효과도 감소하는 경향을 보였다. 어성초 물 추출물의 투여 용량이 40㎎/㎏에서 흰쥐 신장과 간장에서 카드뮴에 대한 해독 경감효과가 우수하게 나타났으며, 간장에서 카드뮴에 대한 해독 경감효과 우수하게 나타났다. 흰쥐 체중은 어성초 물 추출물의 투여용량이 증가할수록 체중도 증가 하였지만 3주 이후에는 체중의 증가의 변화는 크지 않았다. 이 결과를 볼 때 어성초 물 추출물이 흰쥐 장기내 카드뮴에 대한 해독 경감효과가 나타났다. This study was conducted to investigate the antitoxic component in aqueous extract of Houttuynia cordata T_HUNB. The results were as follows: Generally, detoxication effects by Houttuynia cordata T_HUNB extract was administered, it showed the highest antitoxic effects against the toxicity of cadmium in liver. After the extract treatment. Body weights increased in proportion to the extract concentration. However, after 3 weeks, the body weight decreased insignificantly. From the above results, Houttuynia cordata T_HUNB extract increased Metallothinnein concentration and decreased toxicity of cadmium in rats.
Cytotoxicity and antimicrobial effects of the methanolic extract of Sophora flavescens Ait. (IV)
Baek, Seung-Hwa,Kang, Kil-Ung,Lee, Jeong-Ho,Park, Nang-Kyu,Chai, Kyu-Yun,You, Il-Soo,Kim, Jong-Soo,Ryu, Do-Gon,Lee, Kang-Min,Yang, Eun-Yeong,Lee, Hyun-Ok Kyung Hee Oriental Medicine Research Center 2000 International journal of oriental medicine Vol.1 No.2
This study was carried out to evaluate cytotoxicity of the methanol extract from Sophora flavescens Ait. against L1210 (lymphocytic leukemia) and $P388D_1$ (lymphoid neoplasma) Cells in vitro. We have determined cytotoxicity by the MTT (3- (4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H- tetrazolium bromide) assay. The order of cytotoxicity of Sophora flavescens Ait. extracts against L1210 and $P388D_1$ cells in vitro is as follows: Fr. 4 > Fr. 3 > Fr. 5 > Fr. 2 > Fr. 1. These results suggest that the fraction 4 of the methanol extracts from Sophora flavescens Ait. may be a valuable choice for the development of antitumor agents. In order to develop an antimicrobial agent, dried Sophora flavescens Ait. was extracted with hot methanol, and then antimicrobial activity (MIC test) was investigated. In this study, the fraction 3 of the methanol extracts from the roots of S. flavescens showed strong growth inhibition activity against gram-positive and gram-negative bacteria (MIC, $3.125\;{\mu}g/ml$) such as S. mutans, S. epidermidis and P. putida. These results indicate that fractions 3 and 4 inhibit tumor cells and bacteria.
백승화,강길웅,최은영 圓光大學校 基礎自然科學硏究所 2000 基礎科學硏究誌 Vol.18 No.1
고삼(Sophora flavescens Ait)뿌리의 메탄올 추출물을 C_18 frash chromatography fraction중 항균력을 타진하기 위한 방법의 일환으로, 각종 미생물에 대한 균종별 항균력을 비교, 검토한 결과를 요약하면 다음과 같다. 1. 그림 양성균에 대해서 fraction 1,5,6,8에서 50㎍/㎖, 25㎍/㎖, 12.5㎍/㎖, 6.25㎍/㎖이상으로 항균효과를 나타냈으며, 특히 fraction6은 S. aureus 6538P와 B. subtilis에서 최소억제농도6.25㎍/㎖로 가장 강한 항균효과를 보여주었다. 2. 고삼 메탄올 추출물 C_18 frash chromatography fraction 1,5,6,8은 E. coli에서 200㎍/㎖이상으로 항균효과를 나타냈으나, P. aeruginosa에 대해서는 50㎍/㎖, 25㎍/㎖, 12.5㎍/㎖, 6.25㎍/㎖이상 항균효과가 나타났으며, 이중 fraction 6에서 6.25㎍/㎖로 가장 강한 항균효과를 보여주었다. 3. 고삼 메탄올 추출물 C_18 frash chromatography fraction의 진균에 대한 최소억제농도는 200㎍/㎖이상으로 약한 항균효과를 나타내었다. 4. 고삼 뿌리의 메탄올 추출물을 C_18 frash chromatography fraction중 Fr. 5는 12.5㎍/㎖과 6.25㎍/㎖로 가장 강한 항균물질이 포함되어있다고 사료된다. In order to develop an antimicrobial agent, dried Sophora flavescens Ait. was extracted with hot methanol, and then antimicrobial activity was investigated. The minmum inhibitory concentration (MIC) the of extract was the strongest compared to those of other fractions. The fraction 6 had strong growth inhibitory activity against gram-positive bacteria (MIC,6.25~12.5㎍/㎖)such as S. aureus, B. subtilis and M.luteus. Among gram-positive bacteria tested S. aureus and B. subtklis were the most susceptible to the extracted substance. The antimicrobial activity of the fraction 6 from the hot methanolic extract had strong growth inhibition activity gram-negative bacteria such P.aeruginosa(MIC, 6.25㎍/㎖).