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위 아전절제술 후 소화관 문합방법에 따른 조기 결과 비교
정희석,김경종,차윤정,김선필,김권천,장정환,민영돈,Jeong Hee Seok,Kim Kyung Jong,Cha Yun Jeong,Kim Sun Pil,Kim Gwon Cheon,Jang Jeong Hwan,Min Young Don 대한위암학회 2002 대한위암학회지 Vol.2 No.2
Purpose: The proper reconstructive technique after a partial gastrectomy for an adenocarcinoma of the stomach is often debated, but few data exist to clarify the issue. The aim of this study was to compare retrospectively the early postoperative results and complications after different anastomoses used during a partial gastrectomy for a gastric adenocarcinoma. Materials and Methods: We reviewed the hospital records of 218 patients who had undergone a subtotal gastrectomy for gastric cancer at Chosun University Hospital between January 1997 and July 2000. Of the 218 subtotal gastrectomies performed with curative intent, 127 reconstructions were Billroth I gastrectomies and 91 were Billroth II gastrectomies. The following data were analyzed: age, sex, tumor size, gastric resection margin, timing of removal of the nasogastric tube, first bowel movement, resumption of oral feeding, and postoperative complications. Results: The timing of removal of the nasogastric tube was significantly earlier in the Billroth Igroup than in the Billroth II group ($27.9\pm13.9$ hours and $69.7\pm68$ hours, respectively)(P<0.05). Resumption of oral feeding was possible on day $4.6\pm1.5$ in the Billroth I group and on dsy $5.2\pm1.5$ in the Billroth II group (P<0.05). There were no anastomotic leakage, postoperative bleeding, and postoperative mortality among the patients in either group. Conclusions: the Billroth lgastrectomy should be considered for patients undergoing a partial gastric resection for gastric cancer due to its physiological benefits and acceptable rate of complication.
정희석,김중선,이창윤,손희영,Jeong, Hee Seok,Kim, Joong Sun,Lee, Chang-Yoon,Son, Hee Young 대한후두음성언어의학회 2018 대한후두음성언어의학회지 Vol.29 No.1
Background and Objectives : The purpose of this study was to evaluate the impact of surgical extent on voice using acoustic and aerodynamic measurements in a serially followed thyroidectomy patients. Materials and Method : From October 2015 to January 2017, 108 patients who had undergone thyroid surgery and voice test for preoperative, 2, 3, and 6 months postoperatively were classified into five operative types. The radiological stage preoperatively and histopathological stage postoperatively were classified according to the invasion of thyroid capsule and surrounding tissue. For each classification, the results of the voice analysis according to the period were compared and analyzed. Results : The difference of voice according to surgical extent, radiological stage, and histopathologic stage showed significant difference only with Maximal phonation time (MPT) over time. However, in the analysis of interaction between each classification and period, Phonation threshold pressure (PTP) only showed significant results. Conclusion : Differences in imaging and histopathologic stages have no significant effect on recovery of voice symptoms after thyroid surgery. As the extent of operation increases, the pressure to start vocalization is relatively higher, which also varies with time after surgery.
분야별 하부시스템의 최적화를 통합한 분해기반 MDO 방법론
정희석,이종수,Jeong, Hui-Seok,Lee, Jong-Su 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.9
The paper describes the development of a decomposition based multidisciplinary design optimization (MDO) method that coordinates each of disciplinary subspace optimization (DSO). A multidisciplinary design system considered in the present study is decomposed into a number of subspaces based on their own design objective and constraints associated with engineering discipline. The coupled relations among subspaces are identified by interdisciplinary design variables. Each of subsystem level optimization, that is DSO would be performed in parallel, and the system level coordination is determined by the first order optimal sensitivities of subspace objective functions with respect to interdisciplinary design variables. The central of the present work resides on the formulation of system level coordination strategy and its capability in decomposition based MDO. A fluid-structure coupled design problem is explored as a test-bed to support the proposed MDO method.
형광체 코팅에 따른 Remote Phosphor 구조의 백색 LED 패키지 특성 평가
정희석,이정근,강한림,황명근,이미재,김진호,채유진,이영식,Jeong, Hee-Suk,Lee, Jung-Geun,Kang, Han-Lim,Hwang, Myung-Keun,Lee, Mi-Jae,Kim, Jin-Ho,Chae, Yoo-Jin,Lee, Young-Sik 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.4
We developed a package of remote phosphor structure having blue LED chips and phosphors physically separated, and the characteristics were evaluated according to different classifications of phosphor coatings. Remote phosphor was produced by screen printing coating on glass substrate with phosphor content rated paste and heat treatment. After mounting Remote phosphor, which has been classified according to number of coatings, on top of blue LED chips, luminous flux, luminous efficacy, CCT and CRI were measured. The measurement results showed the most suitable characteristics of white LED package as a general light source when the content rate of phosphor in Remote phosphor was 80 wt.% with 3 layers of coatings and thickness over $12{\mu}m$.
온라인논문투고관리시스템(KISTI-ACOMS)의 통합 버전 관리
정희석(Jeong hee-seok),최명석(Choi myung-seok),박재원(Park jae-won),강무영(Kang moo-yeong) 한국콘텐츠학회 2007 한국콘텐츠학회 종합학술대회 논문집 Vol.5 No.2_1
현재 27M 이상의 학회에 설치된 온라인논문투고관리 시스템 KISTI-ACOMS는 개발 당시 예상에 비하여 훨씬 빠른 속도로 설치 학회 수가 늘어남으로 인하여 많은 양의 소스 코드를 관리하기가 점점 어려워지고 있다. 또한 이 프로그램의 본질적 특성상 빈번하게 학회에서 들어오는 수정 요구에 의한 소스 코드의 수정은 체계적인 프로그램 관리를 더욱 어렵게 한다. 이에 KISTI에서는 여러 학회의 서비스를 한 버전의 소스 코드로 통합 관리하는 체계를 고안하였으며 이 시스템의 개발로 유지/보수 측면에서 관리해야 할 소스 코드의 양이 대폭 줄어들 뿐 아니라 기존에 비하여 사용자들의 요구사항에 대하여 훨씬 능동적인 대처가 가능해질 것이다. KISTI-ACOMS(Online peer review system), which is installated for more than 270 learned societies, is getting harder to manage large amount of source codes, because the number of installation has been growing much faster than we expected at the development time. Moreover the fundamental problem of this system, that frequent requests of modification from societies comes with modification of source codes, makes it more difficult to manage this program systematically. Thereupon we formulated a system to provide services for many societies using one version of source code, and this system is expected to reduce the managed amount of source codes and to make us cope with requests of societies of more positive than until now.