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최경현,유중재,신연명,허방,박재선,Choi, Kyung-Hyun,Yoo, Jung-Jae,Shin, Yeon-Myung,Hur, Bang,Park, Jae-Sun 대한소아외과학회 2007 소아외과 Vol.13 No.2
Biliary atresia (BA) is an uncommon neonatal surgical disease that has a fatal outcome if not properly treated. The survival rates of the patients with native liver after Kasai's operation in countries outside Japan are not so good. We reviewed the results of 22 cases of biliary atresia treated in Kosin University Hospital between October 1987 and March 2001. There were 13 males and 9 females aged from 21 to 106 days (mean 52 days). There were 3 cases of Type I (13.6%), and 3 of Type II (13.6%), and 16 Type III (72.7%). The operative methods were resection of the common bile duct remnant and cyst followed by Roux-en-Y hepaticojejunostomy in 3 cases for Type I BA; Kasai I in 15 cases, Kasai II in 1 case, and Ueda's operation in 3 cases for Types II and III BA. There was no death within the first 30 days after operation. We were able to follow 21 of the 22 patients (95.4%) for more than 5 years. The actual 5 year survival rate (YSR) was 40.9%. One Type I case received a living-related liver transplantation at 6 years of age because of the multiple intrahepatic stones and liver cirrhosis. Five YSR after biliostomy group (Kasai II and Ueda op.) was 75 % (3/4) while that of Kasai I was 20% (3/15). One case had no bile duct in the resected fibrotic plaque on microscopic review and died 8 months after Kasai I operation, would have been a strong candidate for early liver transplantation. From the above result, our conclusions are as follows; (1) early liver transplantation should be considered for cases of no bile duct after pathologic examination of the resected specimen, (2) measures to prevent postoperative cholangitis and prevention of postoperative liver cirrhosis are needed, (3) liver transplantation program should be available for failed cases.
가변 빔익스팬더 기반의 최적 주사경로 생성 알고리즘 개발
최경현(Kyung-Hyun Choi),김형찬(Hyung-Chan Kim),도양회(Yang-Hoi Doh),김동수(Dong-Soo Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
In Solid Freeform Fabrication System (SFFS), the reduction of total processing time is very important specifically for SLS process that is sintered using heat energy. When the time delay occurs in the process, shrinkage, warpage and curling occur by a heat energy distribution difference and effect the accuracy and the system efficiency. Therefore, the reduction of total processing time is an important issue in SFF system. A digital mirror system (DMS) is a system which scans the laser beam with different spot size. The spot size is selected based on the slicing section to decrease and accuracy of the process time and improve the processing efficiency. In this study, the optimal scan path generation for DMS will be addressed, and this development will improve the whole processing efficiency and accuracy through the scan efficiency by considering the existing scan path algorithm and heat energy distribution.
부산지방 성인의 Helicobacter pylori 보균 실태
최경현(Kyung Hyun Choi),이상호(Sang Ho Lee),박영훈(Young Hun Park) 대한소화기학회 1996 대한소화기학회지 Vol.28 No.6
N/A Background/Aims: In recent years much work has been done on the link between Helicobacter pylori and gastric diseases. In order to study the prevalence of Heliccbacter pylori infection in normal Koreans,we determined the anti-Helicobacter pylori imnunoglobulin G levels in 664 ernployees working in Kosin medical center, Pusan Korea. Methods: Helicobacter pylori Ig G antibodies w=re asssayed by enzyme linked immunosorbent assay(ELISA), and ABO blood group was examined. Results: Overall seropositivity was 79.1%. The prevalance of infection increased with aging (p<0.05). There was no relationship between ABO blood group and Helicobacter pylori seropositivity. Conclusions: There was high prevalence of Helicobacter pylori infection among Korean adults. (Korean J Gastroenterol 1996;28:758 - 763)
최경현(Kyung-Hyun Choi),도양회(Yang-Hoe Doh),김형찬(Hyung-Chan Kim),김동수(Dong-Soo Kim) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
In solid freeform fabrication system (SFFS), the fabrication process mainly consists of four steps; heating powder, filling nitrogen gas, stacking sliced layers, and cooling a chamber. Among these steps, the time required for staking layers depends on a scan path generation method. When a scan path is in-line stitching type, the number of jumps will increase because of convex or concave segments of the loops and inner loops of each layer. Consequently, the scanning time is taken longer due to unnecessary jumps. To enhance fabrication time, the unnecessary jumps must be removed as many as possible. In this paper, a regional scan method has suggested by dividing specific regions at each layer. An optimal scan path will be s generated by rearranging the in-line stitching scan path after dividing each layer according to the minimal number of jumps.