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서도영,조희주,조정만,강정윤,유탁근 대한비뇨의학회 2013 Investigative and Clinical Urology Vol.54 No.8
Purpose: To investigate the learning curve and outcomes of robot-assisted laparoscopic radical prostatectomy (RALP) performed by a relatively lower volume surgeon at a secondary training hospital. Materials and Methods: The medical records and the surgery video recordings of 100 patients who underwent RALP by a single surgeon between March 2010 and January 2013 were reviewed. The first 10 cases were grouped into period 1, cases 11 to 40 into period 2, cases 41 to 70 into period 3, and cases 71 to 100 into period 4. The interval between the operations, the operative time for each step of the surgery, the total console time, and the operative outcomes were investigated. Results: The mean interval between surgeries was 10.6±9.3 days. The console time decreased progressively after the first 10 cases and reached under 3 hours after 75 cases. The time taken to begin dissection of the dorsal vein complex, for the division of the bladder neck, for lateral dissection with neurovascular bundle preservation, and for apex dissection decreased significantly with experience, although the time for vesicourethral anastomosis did not. The margin-positive rate of stage T2 patients was 27.4% (20/73), and the transfusion rate was 50% in period 1 patients and 3.3% in period 4 patients. No major complications occurred. Conclusions: It is difficult to shorten the learning curve of surgeons in secondary training hospitals owing to the smaller number of cases and the irregular surgical intervals. Although the operation time was relatively longer, the surgical outcome and complication rates were comparable with those of surgeons at larger hospitals.
서도영,황선우,손창민,김귀순 한국항공우주학회 2017 International Journal of Aeronautical and Space Sc Vol.18 No.2
In this study, a series of conjugate heat transfer (CHT) analyses are conducted for a stage of a fully cooled high-pressure turbine (HPT) at elevated levels of free stream turbulence (Tu = 5% and 25.7%). The goal of the analyses is to investigate the influence of high turbulence intensity on the fluid-thermal characteristics of a nozzle guide vane (NGV). The turbine inlet temperature is defined by considering a typical radial temperature distribution factor (RTDF). The Unsteady Reynolds Average Navier–Stokes (URANS) CHT simulations are carried out using CFX 15.0, a commercial CFD package. The presented CFD modeling approach for high turbulence intensity is verified with the experimental data from two types of NASA C3X NGVs with films. The computation grid is generated for both the fluid and solid domains. The fluid domain grid is created using a tetrahedral grid system with prism layers because of its complex geometry, and the solid domain grid is composed of only tetrahedral elements. The analytical results are compared to understand the effect of turbulence on flow characteristics and metal temperature distributions. The results obtained in this study provide useful insights on the effects of high free stream turbulence and unsteadiness. The results also lead to the proposal of meaningful turbine design guidelines.
고압 터빈 노즐에서 주유동과 막냉각 유동간의 간섭 현상에 대한 연구
서도영(Doyoung Seo),방명환(Myeonghwan Bang),손창민(Changmin Son),김귀순(Kuisoon Kim),이동호(Dong-Ho Rhee),차봉준(Bongjun Cha) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
본 논문에서는 고압 터빈 1단 노즐의 전산 해석을 수행하고 주유동과 막냉각 유동 간의 간섭 현상에 대해 서술하였다. 이를 위해 막냉각 홀 개수의 변화에 따른 막냉각 효율 변화를 고찰하였다. 전산해석에는 상용 유동해석 프로그램인 ANSYS사의 CFX를 사용하였고, 압축성 RANS 방정식이 이용 되었으며, k-ω SST 난류 모델을 사용하였다. 전산해석 기법은 막냉각 C3X 노즐 실험 결과를 사용하여 검증하였다. 격자는 비정렬 격자계로 구성하였으며 격자 테스트를 수행하였다. This paper describes the numerical investigation of the film interaction with external flow in the 1st stage NGV of a HP turbine. In order to study film cooling effectiveness variation, film row numbers were changed. The geometries of NGV includes fully cooled internal passages and films. For the numerical analysis, RANS approach with the k-ω SST turbulence model was modeled using by ANSYS CFX. The validation model of numerical analysis uses the film cooled C3X nozzle. Mesh created by unstructured mesh, and the authors report the results of mesh sensitivity studies.
Efficacy of Alfuzosin After Shock Wave Lithotripsy for the Treatment of Ureteral Calculi
조희주,신순철,서도영,민동석,조정만,강정윤,유탁근 대한비뇨의학회 2013 Investigative and Clinical Urology Vol.54 No.2
Purpose: We evaluated the efficacy of alfuzosin for the treatment of ureteral calculi less than 10 mm in diameter after extracorporeal shock wave lithotripsy (ESWL). Materials and Methods: A randomized, single-blind clinical trial was performed prospectively by one physician between June 2010 and August 2011. A total of 84 patients with ureteral calculi 5 to 10 mm in diameter were divided into two groups. Alfuzosin 10 mg (once daily) and loxoprofen sodium 68.1 mg (as needed) were prescribed to group 1 (n=41), and loxoprofen sodium 68.1 mg (as needed) only was prescribed to group 2(n=44). The drug administration began immediately after ESWL and continued until stone expulsion was confirmed up to a maximum of 42 days after the procedure. Results: Thirty-nine of 41 (95.1%) patients in group 1 and 40 of 43 (93.0%) patients in group 2 ultimately passed stones (p=0.96). The number of ESWL sessions was 1.34±0.65and 1.41±0.85 in groups 1 and 2, respectively (p=0.33). The patients who required analgesics after ESWL were 8 (19.5%) in group 1 and 13 (30.2%) in group 2 (p=0.31). Visual analogue scale pain severity scores were 5.33±1.22 and 6.43±1.36 in groups 1 and 2,respectively (p=0.056). The time to stone expulsion in groups 1 and 2 was 9.5±4.8 days and 14.7±9.8 days, respectively (p=0.005). No significant adverse effects occurred. Conclusions: The use of alfuzosin in combination with ESWL seems to facilitate stone passage and to reduce the time of stone expulsion but does not affect the stone-free rate.