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고압터빈 노즐에서 입구온도분포와 장착조건에 따른 저주기 피로 수명 영향에 대한 연구
허재성(Jae Sung Huh),강영석(Young Seok Kang),이동호(Dong Ho Rhee),서도영(Do Young Seo) 대한기계학회 2015 大韓機械學會論文集A Vol.39 No.11
항공기 및 엔진의 성능 극대화와 운용 유지비 최소화로 인하여 고압터빈 구성품은 점점 더 가혹한 환경에서 장시간 운용을 요구 받고 있다. 이를 해결하기 위해 냉각 극대화, 재료의 고급화, 코팅 기술 적용 등과 함께 재료 모델링, 유한요소해석, 통계적 기법 등의 수치적 해석 방법이 광범위하게 활용되고 있다. 본 연구에서는 일방향 응고 재료의 1 단 고압터빈 노즐의 운용 환경인 터빈 노즐 입구온도분포와 장착조건의 변화에 따른 노즐의 구조 건전성을 저주기 피로 수명을 통해 평가하고 가장 유리한 조건을 모색하고자 한다. 이를 위해 냉각 설계에 의한 노즐의 금속 온도 분포는 복합 열전달 해석을 통해 얻으며, 이를 근거로 탄소성 해석을 수행하고 그 결과를 기초로 저주기 피로 수명을 평가하였다. High pressure components of a gas turbine engine must operate for a long life under severe conditions in order to maximize the performance and minimize the maintenance cost. Enhanced cooling design, thermal barrier coating techniques, and nickel-base superalloys have been applied for overcoming them and furthermore, material modeling, finite element analysis, statistical techniques, and etc. in design stage have been utilized widely. This article aims to evaluate the effects on the low cycle fatigue life of the high pressure turbine nozzle caused by different turbine inlet temperature profiles and installation conditions and to investigate the most favorable operating condition to the turbine nozzle. To achieve it, the structural analysis, which utilized the results of conjugate heat transfer analysis as loading boundary conditions, was performed and its results were the input for the assessment of low cycle fatigue life at several critical zones.
로봇 보조 복강경 방광적출술 및 요로전환술의 초기 경험
조희주(Hee Ju Cho),신순철(Soon Cheol Shin),서도영(Do Young Seo),민동석(Dong Suk Min),조정만(Jeong Man Cho),강정윤(Jung Yoon Kang),유탁근(Tag Keun Yoo) 대한비뇨기종양학회 2012 대한비뇨기종양학회지 Vol.10 No.1
Purpose: Robot assisted laparoscopic radical cystectomy (RARC) is one of the options for minimal invasive treatment of muscle invasive bladder cancer or uncontrolled non muscle invasive bladder cancer. We detailed our operative techniques and initial experiences of robot assisted laparoscopic radical cystectomy with urinary diversion. Materials and Methods: From April 2010 to December 2011, 10 consecutive patients with bladder cancer who were performed robot assisted laparoscopic radical cystectomy with urinary diversion were enrolled. Patient’s demographics, intra-, perioperative data and oncologic outcome were analyzed. Urinary diversions including 9 ileal conduit and 1 ileal orthotopic neobladder were underwent extracoporeally. Results: Mean patient age was 65.1 years. The mean body mass index was 22.7kg/m². The mean operation time was 588.1min including 319.5min for robot assisted laparoscopic cystectomy (RARC), 165.0min for extracorporeal urinary diversion and 53.1min for lymph node dissection. The mean estimated blood loss was 244.7ml. The mean number of retrieved lymph node was 17.2. The pathologic report showed transitional cell carcinoma in all cases and adenocarcinoma of prostate in 2 male patients. No intra-operative complication was occurred. Conclusions: Robot assisted laparoscopic radical cystectomy could minimize surgery related complications without jeopardizing oncologic outcome. RARC may be effective treatment option for advanced bladder cancer.