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고양문,임윤철 울산대학교 1982 연구논문집 Vol.13 No.2
전단경계층을 점와류의 열로 근사시켜 수치해석하였다. 계산된 평균속도분포와 경계층 두께의 증가율은 혼합경계층에 대한 실험결과와 잘 일치하고 있으며, 경계층은 와류결합에 의하여 증가함을 확인하였다. 또 와류결합은 매우 신속하게 이루어지며, 와류결합과 와류결합 사이에는 만들어진 소용돌이가 평형상태에 도달하기에 충분한 시간여유가 있음이 밝혀졌다. Shear layer is simulated by an array of point vortices and analyzed numerically. Calculated mean velocity profile and boundary layer spreading rates are in good agreement with experimental data on mixing layers. It is confirmed that the shear layer grows by vortex pairing and that large eddies formed by vortex pairing has sufficient time to get equilibrium states before next vortex pairing processes take place
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유동 방향에 직각으로 놓인 원관에서 원주 방향의 열전도가 열관류계수에 미치는 영향
高亮文 울산대학교 1977 연구논문집 Vol.8 No.2
본 논문에서는 국소열전달계수의 비균일성으로 유발되는 관벽에서의 온도 구배가 열관류계수에 미치는 영향을 조사하였다. 판벽에서의 열전도의 외부 유체로의 대류 열전달에 대한 상대적인 크기를 나타내기 위한 무차원 변수?과 관 외부의 대류 열저항과 관 내부에서의 대류 열저항의 비를 나타내는 무차원 변수?의 함수로 열관류계수의 변화를 표시하였으며, β가 1정도일 경우 관벽의 온도를 균일하다고 가정하여 계산된 전열량은 온도 구배를 고려할 겨우보다 10%이상 크게 나타나나, β가 10이상인 경우에는 그 차가 5%미만임이 밝혀졌다. The effect of peripheral wall conduction on overall heat transfer coefficient of a tube in a tranverse flow was investigated. Non-dimensional parameters,?and?, which denote the relative magnitude of heat conduction to that of convective heat transferand the ratio of thermal resistance at the outside of the tube to that inside, respectively, were used. It was found that heat transfer rate obtained assuming uniform temperature around the tube is about 10% higher than that calculated considering temperature gragient when βis order of unity and that the difference is less than 5% if βis larger than 10.
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高亮文 울산대학교 1977 연구논문집 Vol.8 No.1
半無限 水槽의 壁에 直角으로 붙어 있는 二次元 流路에서의 流動問題를 等角寫象을 利用 을 한 다음 差分法을 適用하여 數値解析 하였다. 實際 計算은 Reynolds數가 5및 10인 경우에 對하여 하였으며, 流動函數와 度, 그리고 速度展開 및 壓力降下를 구하였다. Laminar flow in the inlet region of a two dimensional straight channel which is rightly to the wall of a cistern was studied numerically. Stream function and vorticities were obtained for the Reynolds numbers of 5 and developments and pressure losses along the channel were also calculated.
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Dispersion of Passive contaminants in a Trubulent Boundary Layer
Koh,Yang-Moon 울산대학교 1982 연구논문집 Vol.13 No.2
경계층 내에서의 난류 확산을 해석하기 위한 새로운 second-order closure방법을 개발 하였으며, 난류경계층 내에 있는 점원으로부터의 확산에 관한 문제에 적용한 결과는 실험결과와 잘 일치하고 있다. A method to predict the dispersion of passive contaminants in a turbulent boundary layer is developed based on second-order closure approach. The dissipation of the mean scalar flux due to pressure scrambling is assumed to be inversely proportional to the plume length scale when the plume scale is small. The result appears to be in general agreement with the experiment.
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응급실에 내원한 파상풍 환자의 임상 양상 및 예후 영향 인자 분석
이형연,문정미,민용일,전병조,고양석,이병국 대한응급의학회 2007 대한응급의학회지 Vol.18 No.2
Purpose: Tetanus is difficult for emergency physician to diagnosis at an early stage because of its low incidence and atypical initial clinical features. Therefore, we reviewed the clinical features of 54 tetanus cases and attempted to identify factors associated with prognosis in order to improve early diagnosis and treatment. Methods: We carried out a retrospective chart review of 54 adult tetanus patients who presented to the ED of Chonnam National University Hospital between January 1996 and December 2005. We collected information on demographics, SAPS II score, clinical feature, course of infection and prognosis. We divided the patients to two groups according to the survival and compared their data statistically. Results: Fifty four patients, 33 men and 21 women, were included in the study. The mean age was 50.97±15.95. The most common initial diagnosis in ED were electrolyte imbalance (n=15), neck and facial dystonia (n=9). The mean incubation period was 10.27±6.47 days. The initial SPAS II score 17.29±8.45 and the Wood score was 3.12 ±1.47. Most commonly symptom was dyspnea and dysarthria. Twenty one patients were supported by mechanical ventilation, and the duration of mechanical ventilation was 5.92±4.52 days. On multivariate logistic regression analysis, four variables were found to be associated with the prognosis: incubation period, Wood score, Time interval from initial symptom to mechanical ventilation, initial SAPS II. Conclusion: Four variables correlated well with the prognosis: Incubation period, Wood score, Time interval from initial symptom to mechanical ventilation, initial SAPS II score.
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