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임우택,정용식,유건상,김종현,김영훈 7개 국립대학교 환경연구논문집 공동발행 위원회 2005 공업기술연구 Vol.5 No.-
Cr(VI) is a known toxic heavy metal which is found frequently in many industrial sites. Contaminates soil and ground water with Cr(VI) is a big enviromental concern due to the high toxicity. Permeable Reactive Barrier(PRB)is an innovative remedial technology intensively studied and developed recenty. The most popular PRB material is zero-valent iron which is environmentally favorable and cheap. Scrapped steels and precleaned scrapped steels were tested in this study for Cr(VI). Scrapped steels were precleaned wuth detergent, acetone, hexane.The precleaned scrapped steel showed relatively high reactivity for Cr(VI). The results indicate that the scrapped steel could be used as PRB material after proper pretreatments.
누두흉의 새로운 수술기법 : Nuss 술식 Nuss Procedure
김연수,류지윤,장우익,김욱성 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.4
Objective : The Nuss procedure, recently introduced technique allows for minimally invasive repair of pectus excavatum. The aim of this report was to assess the result of the Nuss proceure. Methods and Material : From Jan, 2000 to jan, 2003, 7 patients were operated by the Nuss procedure and six patients was fallowed up regularly. Patients were evaluated retrospectively for pectus index, operation time, needs for transfusion, complication, and hospital stay. Result : Pectus index was improved from 4.16 to 2.92 by mean value. Average operation. Average hospital stay after operation was 6.3 days. We experienced one case of pneumothorax requiring closed thoracostomy, and that patient had atelectasis requiring bronchoscopy for lung expansion. But there was no pectus bar displacement requiring early removal of the bar. Conclusion : This minimally invasive technique, which requires neither cartilage incision nor resection, is effective and associated with shorter operation time, smaller incisions, and less dissection.
김연수,류지윤,김욱성,장우익,김한성 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.2
Pulmonary sequestration is a rare congenital lung disease. It is classified as intrapulmonary sequestration, having own visceral pleura, and extrapulmoanry sequestration, not having own visceral pleura. We experienced two cases of intrapulmonary pulmonary sequestration. Two cases were developed in right lower lobe of lung. A 31 year old man had coughing, sputum, and febrile sensation for 2 months. He had antituberculosis medication because he was misdiagnosed as pulmonary tuberculucosis. The sequestrated lung was supplied by systemic artery originated from descending thoracic aorta. Another 58-year-old woman had symptoms of recurrent upper respiratory infection occurring over a seven-year period. We couldn't find aberrant artery form 2nd case. We performed lobectomy in two cases and patients were treated successfully without complication.
Vascular Cell Responses against Oxidative Stress and its Application
Ryoo, Sung-Woo,Lee, Sang-Ki,Kim, Cuk-Seong,Jeon, Byeong-Hwa Biomedical Engineering Society for Circulation 2004 International Journal of Vascular Biomedical Engin Vol.2 No.2
The history of studies in biology regarding reactive oxygen species (ROS) is approximately 40 years. During the initial 30 years, it appeared that these studies were mainly focused on the toxicity of ROS. However, recent studies have identified another action regarding oxidative signaling, other than toxicity of ROS. Basically, it is suggested that ROS are reactive, and degenerate to biomolecules such as DNA and proteins, leading to deterioration of cellular functions as an oxidative stress. On the other hand, recent studies have shown that ROS act as oxidative signaling in cells, resulting in various gene expressions. Recently ROS emerged as critical signaling molecules in cardiovascular research. Several studies over the past decade have shown that physiological effects of vasoactive factors are mediated by these reactive species and, conversely, that altered redox mechanisms are implicated in the occurrence of metabolic and cardiovascular diseases ROS is a collective term often used by scientist to include not only the oxygen radicals($O2^{-{\cdot}},\;{^{\cdot}}OH$), but also some non-radical derivatives of oxygen. These include hydrogen peroxide, hypochlorous acid (HOCl) and ozone (O3). The superoxide anion ($O2^{-{\cdot}}$) is formed by the univalent reduction of triplet-state molecular oxygen ($^3O_2$). Superoxide dismutase (SOD)s convert superoxide enzymically into hydrogen peroxide. In biological tissues superoxide can also be converted nonenzymically into the nonradical species hydrogen peroxide and singlet oxygen ($^1O_2$). In the presence of reduced transition metals (e.g., ferrous or cuprous ions), hydrogen peroxide can be converted into the highly reactive hydroxyl radical (${^{\cdot}}OH$). Alternatively, hydrogen peroxide may be converted into water by the enzymes catalase or glutathione peroxidase. In the glutathione peroxidase reaction glutathione is oxidized to glutathione disulfide, which can be converted back to glutathione by glutathione reductase in an NADPH-consuming process.
외국인투자와 수출이 성장에 미치는 효과 분석: 브릭스 패널을 중심으로
류승우 ( Sung Woo Ryoo ),이재우 ( Jae Woo Lee ) 한국경제통상학회 2014 경제연구 Vol.32 No.2
본 연구는 브릭스 구성국가의 외국인적접투자(FDI), 수출, 환율 등 개방변수들의 경제성장에 대한 영향도를 패널분석을 통하여 검증하고자 시도하였다. 이번 연구는 다음과 같은 점에서 기존 연구와 구별된다. 우선, 브릭스 4개국 전부를 대상으로 장기간의 시계열 데이터를 구축하여, 패널 분석을 실시하였다. 또한 F-검증, Hausman 검증 등을 통하여 최적의 분석모형을 선정한 다음, 이를 토대로 브릭스 국가들의 외국인직접투자, 수출 등 이른바 개방변수가 이들 국가의 경제성장에 영향을 미치는가, 얼마나 영향을 미치는가를 분석하였다. 분석의 결과 브릭스 국가에서 외국인직접투자, 수출 등 개방 변수들은 매우 유의한 수준으로 경제 성장에 정의 영향을 미치고 있는 것으로 나타났다. Since open and reform policies, the BRICs have all achieved a high economic performance in economic growth. Despite BRICs’ increasing economic importance in world stage, it has not been answered whether and how FDI inflows and exports influence economic growth in the BRICs. With a panel data of four BRICs countries during 1993-2011, we estimate pooled OLS, fixed effect and random effect models to test the FDI-led or export-led growth hypotheses. Our results strongly confirm that FDI inflow as well as exports has contributed significantly to economic growth in BRICs.
Shin, Woo-Sung,Cuong, To Dao,Lee, Jeong-Hyung,Min, Byung-Sun,Jeon, Byeong-Hwa,Lim, Hyun-Kyo,Ryoo, Sung-Woo The Korean Society of Pharmacology 2011 The Korean Journal of Physiology & Pharmacology Vol.15 No.3
Caesalpinia sappan (C. sappan) is a medicinal plant used for promoting blood circulation and removing stasis. During a screening procedure on medicinal plants, the ethylacetate extract of the lignum of C. sappan (CLE) showed inhibitory activity on arginase which has recently been reported as a novel therapeutic target for the treatment of cardiovascular diseases such as atherosclerosis. CLE inhibited arginase II activity prepared from kidney lysate in a dose-dependent manner. In HUVECs, inhibition of arginase activity by CLE reciprocally increased NOx production through enhancement of eNOS dimer stability without any significant changes in the protein levels of eNOS and arginase II expression. Furthermore, CLE-dependent arginase inhibition resulted in increase of NO generation and decrease of superoxide production on endothelium of isolated mice aorta. These results indicate that CLE augments NO production on endothelium through inhibition of arginase activity, and may imply their usefulness for the treatment of cardiovascular diseases associated with endothelial dysfunction.