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담낭절제술후의 내시경적역행성담췌관조영술의 진단소견과 치료
김원석(Won Seok Kim),조형철(Hyung Chul Cho),조장현(Jang Hyun Cho),추진호(Jin Ho Chu),김명원(Myung Won KIm),오기창(Ki Chung Oh),강명원(Myung Won Kang),임연근(Yun Kun Lim),여향순(Hyang Soon Yeo),박홍배(Hong Bae Park) 대한내과학회 1998 대한내과학회지 Vol.54 No.5
N/A Objectives: Accurate assessment of the retained or recurrent bile duct stone is important in postcholecys-tectomy patients who have signs of cholangitis or other pancreatobiliary disease. This study was performed to evaluate the diagnostic and therapeutic reliability of endoscopic retrograde cholangiography in posteholecystectomy patients. Methods: From October 1975 through August 1995, we reviewed 311 patients retrospectively who had undergone on cholecystectomy, Our study was based on assessment of their age, sex, symptoms and physical findings, comparison between sonographic and endoscopic retrograde cholangiographic findings, and stone removal rate using endoscopic sphincterotomy, basket, electrohydraulic lithotripsy. Results: The ratio of male to female was 1:1.67, and the mean age was 56±14.3 years. After cholecystectomy, they visited our clinic within 2 years in 25 patients (8.4%), beyond 2 years in 286 patients (91.6%). Most common symptoms and physical findings were epigastric pain or tenderrs (63.6%). We detected bile duct stone using endoscopic retrograde cholangiography 219 patients. In case of the bile duct stone, we successfully removed it using endoscopic sphincterotomy, basket, electrohydraulic lithotripsy in 194 patients (88.6%). Conclusion: From the above results, we concluded that endoscopic retrograde cholangiography was the most effective diagnostic and therapeutic method in postch-olecystetomy patients who have signs of cholangitis.
대심도 터널용 가역축류송풍기 근사대칭에어포일의 공력 및 기하학적특성 연구
고희환(Hee-Hwan Ko),정철영(Cheol-Young Jeong),강명원(Myung-won Kang),박준영(Jun-Young Park) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
The reversible axial fan is used to tunnel ventilation such as greate deep tunnel, railway tunnel and mine tunnel. Normally it supply the fresh air of exhaust polluted air and heat. In emergency, it exhaust poisonous gas and the high temperature heat for save peoples or properties. In this study, reversible axial fan in order to apply to transverse ventilation system such as U-smart way, GTX, Longer road tunnels. The blade section shape is designed as "approximate symmetric airfoil" which has bi-directional characteristic. This fan can proof against up to 300 ℃, over 1500 Pa(total pressure), has the 94% flow rate when the flow rate compares reversible flow case to forward flow case. In order to optimizing the reversible fan, I designed the fan through the analysis of 3-dimension viscous incompressible flow and through-flow analysis with ANSYS. All the fan performance tested in certified laboratory as of May 2011.