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김부성,김석윤,Kim, Boo-Sung,Kim, Seok-Yoon 대한전자공학회 1999 電子工學會論文誌, C Vol.c36 No.8
빠르고 정확한 결과를 얻기 위해서 타이밍 수준에서의 회로 해석이 이루어지며, 게이트와 연결선에서의 신호 지연 해석은 회로의 설계 검증을 위하여 필수적이다. 본 논문에서는 CMOS 회로 게이트에서의 지연 시간과 연결선의 지연 해석을 위한 초기 천이 시간을 동시에 계산할 수 있는 방법을 제시한다. 회로 연결선의 유효 커패시턴스 개념을 이용하여 게이트의 지연 시간과 게이트에서의 구동 저항을 고려한 연결선 선형 전압원의 천이 시간을 계산한다. 게이트 지연과 연결선 선형 전압원의 천이 시간을 구하는 과정은 예비 특성화된 게이트 타이밍 데이터를 이용하여 반복적인 연산과정을 통하여 동시에 구하게 된다. 기존의 게이트 지연 계산 알고리즘은 연결선 선형 전압원의 천이 시간을 위해 별도의 게이트 특성 데이터를 필요로 하였으나, 본 논문에서 제시하는 방법은 계산 과정 중에 생성된 데이터를 이용함으로써 현재의 예비 특성화 방법을 수정하지 않고서도 효율적인 타이밍 수준의 게이트 및 연결선 지연 시간 예측이 가능하도록 하였다. Timing-level circuit analyses are used to obtain fast and accurate results, and the analysis of gate and interconnect delay is necessary to validate the correctness of circuit design. This paper proposes an efficient algorithm which simultaneously calculates the gate delay and the transition time of linearized voltage source for subsequent interconnect delay calculation. The notion of effective capacitance is used to calculate the gate delay and the transition time of linearized voltage source which considers the on-resistance of driving gate. The procedure for obtaining the gate delay and the transition time of linearized voltage source has been developed through an iterative operation using the precharacterized data of gates. While previous methods require extra information for the transition time calculation of linearized voltage sources, our method uses the derived data during the gate delay calculation process, which does not require any change in the precharacterization process.
위 정맥류 출혈에 대한 내시경적 정맥류 폐색술, 내시경적 정맥류 결찰술, 역행성 경정맥 위정맥류 폐색술 간의 치료효과 비교
김부성 ( Boo Sung Kim ),박재우 ( Park jae woo ),민슬기 ( Seul Ki Min ),김상균 ( Sang Gyune Kim ),김영석 ( Young Seok Kim ),배준용 ( Jun Yong Bae ),이종찬 ( Jong Chan Lee ),김홍수 ( Hong Soo Kim ),정승원 ( Soung Won Jeong ),장재영 대한소화기학회 2011 대한소화기학회지 Vol.57 No.5
Background/Aims: Endoscopic variceal obliteration (EVO), endoscopic variceal ligation (EVL), and balloon-occluded retrograde transvenous obliteration (BRTO) are used to manage gastric variceal bleeding. We compared the re-bleeding rates and survival times of these modalities. Methods: The study enrolled 103 patients with suspected gastric variceal bleeding between July 2001 and May 2009. For the management of gastric variceal bleeding, 52 patients underwent EVO; 36, EVL; and 15, BRTO. We evaluated their laboratory results and vital signs, and calculated the Child score, Child classification, and Model for End-stage Liver Disease score. Rebleeding was defined as new-onset hematemesis, hematochezia, melena, or endoscopically proven bleeding. Time-to-rebleeding and survival time were examined by Kaplan-Meyer analysis. A value of p<0.05 indicated statistical significance. Results: There were no significant differences in baseline characteristics among the three groups. The overall follow-up period averaged 65.13 months. During follow-up, rebleeding occurred in 17 patients (11 EVO, 5 EVL, and 1 BRTO). The times-to-rebleeding were 63.59, 75.79, and 51.41 months for EVO, EVL, and BRTO, respectively, and did not differ significantly (p=0.515). The median survival times were 77.42, 70.14, and 42.79 months, respectively, and also were not different significantly (p=0.978). Conclusions: There were no significant differences in the time-to-rebleeding or survival time among EVO, EVL, and BRTO. Further prospective, large-scale studies are needed. (Korean J Gastroenterol 2011;57:302-308)
간장 및 담도 : 담도회충증의 임상 중상과 내시경적 치료 - 담낭염 및 췌장염 -
김부성 ( Boo Sung Kim ),정진우 ( Jin Wu Jeong ),유혜신 ( Hye Sin Yu ),조상덕 ( Sang Deok Cho ),정성룡 ( Sung Ryung Chung ),유경진 ( Kyung Jin Yoo ) 대한소화기학회 1986 대한소화기학회지 Vol.18 No.1
N/A Ascaris lumbricoides infection is usually asymptomatic, but when invasion of the ascaris to the human biliary tract is a prominent medical and surgical problems. Here we have two case reports of common bile duct ascariasis, which clinical manifestations were different each other, one is acute pancreatitis form and the other is acute cholangitis form. The management of biliary obstruction caused by ascaris lumbricoides has usually been surgical, but this report describes the endoscopic removal of the ascaris located in the common bile duct.
2009년 국내 Influenza A의 대유행과 급성 A형간염 발병률의 감소
김부성 ( Boo Sung Kim ),박재우 ( Park jae woo ),변진명 ( Jin Myung Byun ),김상균 ( Sang Gyune Kim ),( Yuan Yuan Zhang ),김영석 ( Young Seok Kim ),정승원 ( Soung Won Jeong ),장재영 ( Jae Young Jang ),홍수진 ( Soo Jin Hong ),문 대한소화기학회 2012 대한소화기학회지 Vol.59 No.5
Background/Aims: There was a spiking incidence of acute hepatitis A (AHA) in 2009 summer, but it went down drastically after an outbreak of influenza A (H1N1). We assessed the relationship between 2009 H1N1 pandemic and AHA prevalence from August to December 2009. Methods: We compared AHA cases nationwide and in our hospital for the period from the latter half of 2008 to the end of 2010. H1N1 cases in our hospital from August 2009 to December 2009 were included in the study and the correlation between 2009 H1N1 pandemic and AHA prevalence was assessed. Results: The national surveillance system reported 2,233, 7,895, 15,231 and 7,660 AHA cases from 2007 to 2010, respectively. A similar trend was noted in our hospital in the same periods. Although the national total incidence was increased in 2009, it showed steep decreasing trend line in the final 21 weeks of 2009 (weeks 32-52), as compared with 2008 and 2010. The mean weekly incidence percentage (AHA cases in a week/total in a year) in weeks 32-52 of 2009 was 1.17±0.55%, significantly lower than that in 2008 and 2010 (1.61±0.43% and 1.56±0.51%; p<0.001). Furthermore, we found a significant negative correlation between 2009 H1N1 pandemic and AHA in our hospital for weeks 32-52 of 2009 (r=-0.597; p<0.001). Conclusions: The widespread occurrence of 2009 H1N1 pandemic highlighted the benefits of health care and good hygiene, such as effective hand washing and wearing of masks, which may have also interrupted hepatitis A virus transmission. (Korean J Gastroenterol 2012;59:360-365)
위장관 ( 胃腸管 ) : 말기 식도암의 치료로 내시경적 레이저 치료술 , 화학요법 , 경피 내시경하 위수술을 이용한 2예
김부성(Boo Sung Kim),임계순(Kae Soon Im),백남종(Nam Jong Baeg),한준열(Joon Yeol Han),안병민(Byung Min Ahn),김현응(Hyeon Eung Kim) 대한소화기학회 1991 대한소화기학회지 Vol.23 No.4
N/A Chemotherapy and palliative treatment techniques for advanced esophageal carcinoma using endoscopic Nd-YAG laser and percutaneous endoscopic gastrostomy were performed in two patients for whom curative therapy was not possible. They were not able to eat solid food and were severely undernourished. After successful endoscopic laser therapy and balloon dilation the size of the mass decreased and endoscope passed freely. Because there were many risks and difficulties in esophageal endoprosthesis, we performed percutaneous endoscopic gastostomy. We were able to give adequate nutritional support through it. The endoscopic laser therapy and percutaneous endoscopic gastrostomy will be one of the modalities for palliative treatment of advanced esophageal carcinoma.