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간내 담관암의 전산화단층촬영소견의 특징 - 간 흡충중과의 연관성을 중심으로 -
최병인(Byung Ihn Choi),박재형(Jae Hyung Park),김주완(Chu Wan Kim),김승협(Seung Hyup Kim),김원홍(won Hong Kim),한만청(Chung Yong Kim),김정룡(Eun Sil Yu),김용일(Man Chung Han),유은실(Chu Wan Kim) 대한소화기학회 1988 대한소화기학회지 Vol.20 No.1
N/A 22 patients with intrahepatic cholangiocarcinomas of the liver were examined with computed tomography (CT). Initial symptom was nonspecific such as upper abdominal discomfort or pain in majority. There was no patient with jaundice or liver cirrhosis. 13 patients (59%) showed positive skin or stool test for clonorchis sinensis. 17 patients had the peripheral type of cholangiocarcinoma and five patients had the main duct type. The tumors showed low-density rnasses in pre and postcontrast CT scan in all cases vith wide variation of homogeneity. The tumor margins were irregular in 18 patients (82%) and the degree of contrast enhancement of the tumor was minimal in 19 patients (86%). 13 patients, who had the clonorchiasis, showed mild, and diffuse dilatation r>f the intrahepatic bile duct in addition to the low-density mass. 12 patients (55%) showed extrahepatic metastasis. In peripheral type of the tumor, five patients showed fine, stippled or aggregated powderlike high-density areas in precontrast Cl scan that vere mucinous substances within the mass on pathologic section. Eleven patients showed markedly low-density masses even in postcontrast CT which corresponded to diffuse, microcystic change of the tumor on resected specimen. In main duct type, all patients showed focal ductal dilataion around the low-density mass. Intrahepatic cholangiocarcinoma should be the primary diagnostic consideration when characteristic CT findings are detected in noncirrhotic patient with clonorchiasis.
잔류담석의 (殘留膽石) 경피적 (經皮的) 제거술 (除去術)
최병인(Byung Ihn Choi),박재형(Jae Hyung Park),한만청(Man Chung Han),박용현(Young Hyun park) 대한소화기학회 1984 대한소화기학회지 Vol.16 No.1
N/A Percutaneous extraction of residual biliary tract stones througe T-tube tract was established as a successful and generally accepted radiologic procedure in patients with post-operative retained stones. Percutaneous removal of residual stones was performed in 23 patients at the Department of Radiology, Seoul National University Hospital from November, 1982 to January, 1984 The results were as follows: 1) The male to female ratio was 1: 1.3 and the age ranged from 27 to 76 with everage of 44. 2) Location of residual stones are intrahepatic in 17 cases(73.7%), extrahepatic in 5 cases (21.7%) and combined in 1 case. 3) Number of residual biliary stones was single in 6 cases and 2 to 10 Stones in 5 patients had more than 10 stones. 4) Success rate was 76.5;. In intrahepatic stones and 100% in extrahepatic stones overall success rate was 82.6%. 5) There was no significant complication of this method.
경피경간담배액술 (經皮經肝膽排液術) 193예에 관한 분석
최병인(Byung Ihn Choi),박재형(Jae Hyung Park),임덕(Duk Lim),한만청(Man Chung Han),한준구(Jun Koo Han),이종범(Jong Beum Lee),김주완(Chu Wan Kim) 대한소화기학회 1984 대한소화기학회지 Vol.16 No.2
N/A Percutaneous transhepatic biliary drainage has played a major role in treatment of patients with biliary tract disease, especially obstruction by malignant disease. Percutaneous transhepatic biliary drainage was perfor med 193 times in 152 patients of obstructive jaundice for recent 3 years from July, 1981 to September, 1984 at department of radiology, Seoul National University Hospital. The results were as follows: 1) The male to female ratio was 2:3:1 and the 7 th decade was the most common. 2) The causes of obstructive jaundice included 135 malignant diseases and 17 benign diseases. Malignant diseases were 61 cases of bile duct cancer, 36 cases of metastasis, 26 cases of pancreatic cancer, 6 cases of gallbladder cancer, 4 cases of ampulla Vater cancer, 1 case of duodenal cancer, and 1 case of hepatoma. Benign diseases were 10 cases of common bile duct stone, 1 case of intrahepatic stones, 4 cases of benign stricture and 2 cases of cholangitis. 3) The most common indication was palliative drainage of obstruction secondary to malignant tumor in 113 cases. 4) The overall success rate was 95%. Internal drainage was achieved in 45(24%) cases and external drainage was accomplished in 139 (76%) cases. 5) Decline in serum bilirubin level was found in 144 patients (95%) with the most rapid decline within 1 week after the procedure. 6) Acute major complication occurred in 17 cases (9%) Percutaneous transhepatic biliary drainage is a proven technique for non-operative biliary decompression and established alternative to surgery.
최병인(Byung Ihn Choi),박재형(Jae Hyung Park),임덕(Duk Lim),한만청(Man Chung Han) 대한소화기학회 1983 대한소화기학회지 Vol.15 No.2
N/A Percutaneous transhepatic biliary drainage has played a major role in treatment of patients with biliary tract disease, especially obstruction by malignant disease. Percutaneous transhepatic biliary drainage was performed in 77 patients of obstructive jaundice for recent 2 years since June 1981 at department of radiology, Seoul National University Hospital. The results were as follows, 1) The male to female ratio was 2.3: 1 and the age ranged from 19 to 88 with average of 53. 2) The causes of obstructive jaundice included 69 malignant diseases and 8 benign diseases. Malignant diseases were 24 cases of bile duct cancer, 15 cases of metastasis, 11 cases of pancreatic cancer, 2 cases of gallbladder cancer and 1 case of ampulla Vater cancer. Benign diseases were 5 cases of common bile duct stone and 3 cases of benign stricture. 3) The most common indication was palliative drainage of obstruction secondary to malignant tumor in 54 cases. 4) The overall success rate was 94.8% Internal drainage was achieved in 24(31.2%) and external drainage was accomplished in 49(63.6%). 5) Decline in serum bilirubin level was made in 67 cases(91. 8%) with the most rapid decline within 1 week after the procedure. 6) Acute major complication occurred in 4 of 77 cases (5.2%). Percutaneous transhepatic biliary drainage is a proven technique for non-operative biliary decompression and established alternative to surgery.
Support Vector Machines 기반의 클러스터 결합 기법
최병인(Byung-In Choi),이정훈(Chung-Hoon Rhee) 한국지능시스템학회 2004 한국지능시스템학회논문지 Vol.14 No.3
Convex한 클러스터간의 최적의 거리와 Fuzzy Convex Clustering(FCC) 방법에 의한 효과적인 클러스터 결합 알고리즘을 제시하였다. 또한 두 convex한 클러스터간의 거리 측정 방법의 문제점인 정확성과 수행속도 개선하기 위하여 Support Vector Machines(SVM) 을 이용한 빠르고 정확한 거리 측정 방법을 제시하였다. 따라서 데이터의 부적절한 표현 없이 클러스터들의 개수를 크게 더 줄일 수 있었다. 본 논문에서는 제시한 알고리즘의 타당성을 위하여 여러 데이터에 대한 실험결과를 보여주므로서 제시한 알고리즘을 실제 영상 분할에 적용하여 다른 클러스터링 방법의 결과와 비교분석한다. A cluster merging algorithm that merges convex clusters resulted by the Fuzzy Convex Clustering(FCC) method into non-convex clusters was proposed. This was achieved by proposing a fast and reliable distance measure between two convex clusters using Support Vector Machines(SVM) to improve accuracy and speed over other existing conventional methods. In doing so, it was possible to reduce cluster number without losing its representation of the data. In this paper, results for several data sets are given to show the validity of our distance measure and algorithm.