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청리자감탕이 Streptozotocin으로 유발(誘發)된 흰쥐의 당뇨병(糖尿病) 및 당뇨병합병증(糖尿病合倂症)에 미치는 영향
박윤식,윤경민,임은영,신현철,강석봉,Park, Yoon-Sik,Yoon, Gyeong-Min,Im, Eun-Yeong,Shin, Hyeon-Chul,Kang, Seok-Bong 대한한방내과학회 2010 大韓韓方內科學會誌 Vol.31 No.3
Objective : The object of this study was to observe the effects of aqueous extracts of Chunglijagam-tang(CLJGT), which has traditionally been used in Korean medicine for treating various diseases, on streptozotocin(STZ)-induced rat diabetes and related complications: diabetic nephropathy, hepatopathy and hyperlipemia. Methods : CLJGT extracts were orally administered once a day for 28 days at a dosage 50, 100 and 200mg/kg from 21 days after STZ treatment, and the changes on body weights, blood glucose levels, kidney and liver weights, serum BUN(blood urea nitrogen), creatinine, AST(aspartate transaminase), ALT(alanine aminotransferase), HDL(high-density lipoprotein), LDL (low-density lipoprotein), total cholesterol and triglyceride levels were observed with pancreatic malondialdehyde(MDA) and glutathione(GSH) contents. The results were compared with silymarin 100mg/kg. Results : Significant decrease of blood glucose levels, kidney and liver weights, serum BUN, creatinine, AST, ALT, LDL, total cholesterol, triglyceride levels, pancreatic malondialdehyde contents and significant increase of body weights, serum HDL levels, pancreatic glutathione contents were detected in CLJGT extracts 50, 100 and 200mg/kg administered groups as compared to the STZ control group. Conclusion : CLJGT extracts showed favorable effects on the STZ-induced diabetes and related complications mediated by their antioxidant effects as similar to silymarin. Therefore, it is expected that DBEH has potential for use in the management of diabetes and various diabetic complications.
직육면체 섬유보강재 노반보강공법 현장부설에 따른 지지력 평가 비교분석
박윤식(Park, Yoon-Sik),김자연(Kim, Ja-Yeon),엄기영(Eum, Ki-Young),조국환(Cho, KookHwan) 한국방재학회 2020 한국방재학회논문집 Vol.20 No.6
직육면체 섬유보강재를 이용한 노반보강공법은 친환경적이며 기존 노반 보강 기술의 단점을 보완한 공법이다. 실대형 시험을통하여 열차 속도에 따른 지지력 향상 효과, 안정성 및 시공성이 검증되었다. 검증된 자료를 바탕으로 자갈의 세립화, 뜬침목및 침목균열이 발생한 기존선 구간에 직육면체 섬유보강재를 부설하였다. 노반의 기본 물성시험을 실시하였으며, 보강단면과비보강단면의 현장부설에 따른 침하량을 비교·분석하였다. 직육면체 섬유보강재 부설 후 열차운행에 따른 침하량을 비교분석한결과, 레일 및 침목의 수직 변위량이 최대 84% 감소되었다. 이는 직육면체 보강재의 보강효과로 인해 궤도 지지력이 향상되어궤도의 안정성을 향상시키는 것으로 나타났다. The roadbed reinforcement method, in which a rectangular parallelepiped fiber reinforcement sack is used, is ecofriendly and overcomes the disadvantages of the conventional roadbed reinforcement method. Through large-scale tests, the effects of improving the bearing capacity, stability, and constructability according to the train speed were confirmed. Physical property investigations of the field test were conducted to analyze the conditions of the roadbed. The settlement degree of the site, where the reinforced section and unreinforced section were placed, was measured and analyzed. A rectangular parallelepiped fiber reinforcement sack was laid. Based on the physical properties determined during the field tests, this section was found to be soft ground composed of silt sand with a low bearing capacity. In addition, through comparison and analysis of the degree of settlement caused by the laying of rectangular parallelepiped fiber reinforcement sack, the dynamic vertical displacement of rails and sleepers decreased by at least 84%. It was shown that the track stability improved when the rectangular-parallelepiped fiber reinforcement sack was laid, which reduced the dynamic behavior along and improved the track support.
철도하부 비개착공법의 벽면배면토사의 미소변형에 따른 수평토압 및 응력이완영역에 관한 연구
박윤식(Yoon-Sik Park),이준석(Jun-Seok Lee),조국환(Kook-Hwan Cho) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
In the case where the bottom of railroad is penetrated by non-excavation construction method the design is performed based on the assumption that there is no displacement and no change of stress However measurement data showed that reduction of earth pressure and relaxation of stress take place by the displacement. In this study we investigated the earth pressure on the structure under the railroad constructed by a non-excavation method and the stress relaxation region. The design based on earth pressure is non-economical because it is an over design. Relaxation of stress may lead to road base settlement and rail irregularly due to the reduced railroad supporting stiffness to ballast crack in the case of concrete roadbed. The result showed that it is reasonable to set the stress on the structures as active earth pressure not as earth pressure at rest. Additionally the study on the stress relaxation region identified the regions that should be supported in future construction by a non-excavation method.
기후변화를 고려하기 위한 오염총량관리제 토지계 오염부하량 산정 방식 개선
류지철 ( Ji Chul Ryu ),박윤식 ( Yoon Sik Park ),한미덕 ( Mi Deok Han ),안기홍 ( Ki Hong Ahn ),금동혁 ( Dong Hyuk Kum ),임경재 ( Kyoung Jae Lim ),박배경 ( Bae Kyung Park ) 한국물환경학회 2014 한국물환경학회지 Vol.30 No.2
In this study, a land pollutant load calculation method in TMDLs was improved to consider climate change scenarios. In order to evaluate the new method, future change in rainfall patterns was predicted by using SRES A1B climate change scenarios and then post-processing methods such as change factor (CF) and quantile mapping (QM) were applied to correct the bias between the predicted and the observed rainfall patterns. Also, future land pollutant loads were estimated by using both the bias corrected rainfall patterns and the enhanced method. For the results of bias correction, both methods (CF and QM) predicted the temporal trend of the past rainfall patterns and QM method showed future daily average precipitation in the range of 1.1~7.5 mm and CF showed it in the range of 1.3~6.8 mm from 2014 to 2100. Also, in the result of the estimation of future land pollutant loads using the enhanced method (2020, 2040, 2100), TN loads were in the range of 4316.6~6138.6 kg/day and TP loads were in the range of 457.0~716.5 kg/day. However, each result of TN and TP loads in 2020, 2040, 2100 was the same with the original method. The enhanced method in this study will be useful to predict land pollutant loads under the influence of climate change because it can reflect future change in rainfall patterns. Also, it is expected that the results of this study are used as a base data of TMDLs in case of applying for climate change scenarios.