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김희성,남소현,김대연,김성철,김인구,Kim, Hee-Seong,Nam, So-Hyun,Kim, Dae-Yeon,Kim, Seong-Chul,Kim, In-Koo 대한소아외과학회 2006 소아외과 Vol.12 No.2
Laparoscopic cholecystectomy has been increasingly used because of several advantages, less pain, better expectation for cosmesis (requires small incisions), and more rapid recovery compared with open cholecystectomy. Oral intake is tolerated on the day of operation or on the next. In this study, we evaluated the effectiveness and safety of laparoscopic cholecystectomy in children. Nine cases of laparoscopic cholecystectomy for acute and chronic cholecystitis in children were performed at Asan Medical Center between April 2002 and April 2004. Laparoscopic cholecystectomy was performed on a total of 10 patients, but one of them was excluded because of the simultaneous splenectomy for sickle cell anemia. Clinical presentation, operative findings, operation time, length of hospital stay, and postoperative complications were analyzed. Mean age was 10.4 (4.15) years, and only 3 of patients were less than 10 years. One patient was female. In 8 the diagnosis was calculous cholecystitis. Mild adhesions were found in 3 cases and intraoperative bile leakage in 2. There was no conversion to open surgery and there were no vascular, bowel, or bile duct injuries. Mean operation time was 82.2 (20.160) minutes; mean length of hospital stay was 2.1 (1.3) day. There was no postoperative complication. Laparoscopic cholecystectomy in children was remarkably free of side effects and complications and had a short recovery time. Laparoscopic cholecystectomy for cholecystitis is considered to be a standard procedure in children.
김희성(Hee-Seong Kim),신기철(Kee-Chul Shin),김우식(Woo-Shik Kim),한동훈(Dong-Hoon Han),최상문(Sang-Mun Choi),김재수(Jea-Soo Kim) 한국해양공학회 1997 韓國海洋工學會誌 Vol.11 No.3
The simulation of target-scattered echo with the moving sonar platform and target in 3-dimensional ocean environment is essential to validate and evaluate the performance of a sonar system. This paper presents the improved target signal simulation on the basis of the highlight(HL) model and its realtime algorithm. In order to simulate the scattering highlight, the highlight is represented as a directional scatterer. The realtime generation algorithm of the target signal is realized by use of DSP chip, TMS320C40, where the 40 channels are equally separated to form a parallel processing task in 4 processors. The presented realtime-version of target signal simulation can be used as a target signal simulator in the development of ACM(Acoustic Counter Measure) and advanced sonar signal processing techniques.
응력 기반 파손 기준식을 이용한 탄소 복합재 구조부재의 충격 압궤 해석에 대한 연구
김희성 ( Hee-seong Kim ),김지훈 ( Ji-hoon Kim ) 조선대학교 공학기술연구원 2021 공학기술논문지 Vol.14 No.1
As environmental laws become stricter throughout the world, greater attention is being paid to carbon fiber composites for use as lightweight materials because of their excellent mechanical properties, such as higher specific stiffness and strength, compared with metal materials. However, because such materials are composed of carbon fiber and epoxy resin, a complex failure mechanism caused by crack initiation and propagation arises that depends on the fiber orientation and stacking sequence. Therefore, in this paper, a drop tower test and simulation were carried out to examine the collapse behavior of structural members of CFRP(Carbon Fiber Reinforced Plastics) with different stacking sequences. Simulations were performed for each case for various collapse modes to determine the impact collapse of the carbon composite using stress-based failure criteria.
국채선물시장에서의 외국인 순매수가 국채현물시장에 미치는 영향 분석
김희성 ( Hee Seong Kim ),임병균 ( Byung Kyun Ihm ) 한국금융공학회 2005 금융공학연구 Vol.4 No.2
1999년 9월에 도입된 국채선물은 국채시장의 규모 확대와 더불어 국채시장의 가격형성에도 상당한 영향을 주었던 것으로 인식되고 있다. 일부이기는 하지만 국채선물시장에서의 외국인의 활발한 시장 참여가 현물가격의 형성에 왜곡을 가져왔다는 비판도 있다. 본 연구는 국채선물시장 개장 이후 2005년 7월 까지 외국인의 시장참여 증대가 국채선물시장과 국채현물시장의 수익률 변동에 과연 유의적인 영향을 미쳤는지, 그리고 국채선물 수익률과 현물 수익률 간에 어떠한 동적 관계가 있는지 살펴보는 데 그 목적이 있다. 모든 시계열 자료의 안정성을 확인하고, VAR모형의 추정과 인관관계 검정, 충격반응함수 및 예측오차 분산분해를 통하여 외국인의 순매수 증가율, 선물시장의 수익률, 현물시장의 수익률 등의 인과관계 및 상대적인 영향력을 측정하였다. 분석결과 국채선물시장의 수익률은 현물시장의 수익률에 영향을 미치고 있는 반면, 국채선물시장에서의 외국인 순매수 증가율은 선물시장과 현물시장의 수익률에 거의 영향을 주지 않는 것으로 나타났다. 또한 외국인의 순매수 규모와 국채현물 가격 간에는 유의적인 인과관계가 존재하지 않는 것으로 나타났다. 본 연구 결과 국채선물시장이 현물시장의 가격 형성에 영향을 주었던 것으로 나타났으나 국채선물의 외국인 순매수는 현물시장의 가격에 거의 영향을 주지 않았고, 오히려 현물시장의 가격변동에 외국인 순매수가 유의적인 반응을 보이는 것으로 분석되었다. Vector Autoregressive model estimation, Granger Causality Test, Impulse Response Function, and Forecast Error Variance Decomposition have been conducted to test the dynamic relation between Treasury bond market and foreigner`s net long position of KTB futures market. Especially, this paper is to test whether foreigner`s net long position affects KTB cash market or not since a few bond broker had complained that foreigners might manipulate cash(bond) market through futures market. The data was whole nearby futures daily price data from Sep. 1999 to July 2005, which was stabilized by using rate of return if unit root existed. The empirical test results were as follows; Firstly, the rate of return in KTB futures market affects the rate of return in cash market significantly. This implies that cash market participants consider the KTB futures market price. This is because that Futures market price has been decided much more continuously and competitively than Bond market does. Therefore KTB futures market price seems to be preferred by bond market participants as well as KTB futures market participants. Futures market price could become a benchmark of bond market rate decision and has a role of "price discovery of cash market" Secondly, foreigner`s net long position in KTB futures market has no effects on KTB futures and cash market. The insistence that foreigners might manipulate cash market through futures market was not supported by this results.