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김상대(Kim Sang Dae),안현경(Ahn Hyun Kyoung),이인형(Rhee In Hyoung) 한국산학기술학회 2004 한국산학기술학회 학술대회 Vol.- No.-
암모니아 대신 에탄올아민은 원자력 발전소 2차계통수에서 pH를 증가시쳐 철 부식을 억제하고, 증기 발생기 전열관의 건전성을 제고하기 위해 사용하고 있다. 에탄올아민은 암모니아와 물리화학적 성질이 다르므로, 증기발생기에 유입되는 부식생성물의 용해와 흡착, 이온성 불순물의 잠복현상에 미치는 영향이 다르다. 본 연구에서는 온도가 증가함에 따라 암모니아와 에탄올아민이 부식생성물에 대한 용해와 흡착, 이온성 불순물의 잠복현상에 미치는 영향을 조사하였다. 2차 계통수의 pH 제어제로서 에탄올아민은 암모니아보다 증기발생기 슬러지의 철산화물에 많이 흡착되어 철산화물의 용해도를 증가시키므로 퇴적된 슬러지의 양을 감소시키며, 또한 슬러지에 흡착된 불순물의 양을 감소시켜 잠복 현상을 억제할 것으로 판단된다.
점탄성 이상유동에서 계면장력과 액적크기가 액적변형에 미치는 효과
김상대(S.D. Kim),우병철(B.C. Woo),김시조(S.J. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The finite-element method was developed to analyze the deformation of a drop for the viscoelastic twophase<br/> flow. In the present study a viscoelastic drop suspended in a viscoelastic medium was considered, for<br/> which the Oldroyd B model was employed. The penalty function method was used to eliminate the pressure<br/> variables from the system equations. The shape of a highly deformed drop was described by using<br/> unstructured mesh generator and auto-remeshing techniques. The deformation of a drop was discussed for<br/> various sizes( R =0.2~0.4) and interfacial tensions( ξ=0.0~0.01). As a result, the deformation of a drop has<br/> tendency to be thicker and rounded at the front of a drop for the same drop size. This recoil Phenomena is<br/> increased with increasing the interfacial tension. As the drop size increases the deformation of a drop also<br/> increases, especially at the rear region of a drop, which looks like a dumbbell.
김상대,조국현,김학철,이태희,윤종만,정태중 대한소화기내시경학회 1981 Clinical Endoscopy Vol.1 No.1
A 63 year-old man was admatted to our hospital because of dulI epigastralgia. Upper G-I series reveaied the generalized thickened, tortuous mucosal folds in the stomach and duodenal bulb, Two ovold large pits on the antrum were observed endoscopically, Tha relevant literatures on the subject were reviewed.
3차원 시간이력해석을 통한 하이브리드 비좌굴가새의 풍진동제어능력 평가
김상대(Kim Sang-Dae),강경환(Kang Kyoung-Hwan),고창균(Ko Chang-Kyun),김도현(Kim Do-Hyoun),주영규(Ju Young-Kyu) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.10
Buckling Restrained Braces(BRBs) show good seismic behavior. They do not dissipate energy, however, when they are subjected to wind. Hybrid Buckling Restrained Braces(H-BRBs), which can improve the wind performance of the BRB system, are a kind of hybrid damper system composed of a viscoelastic damper and BRBs. In this paper, the H-BRBs subjected to wind load was explored in the method of time history analysis for 3-dimensional model. The wind load for serviceability design was obtained from the wind tunnel test. Along wind and across wind load datas were used. Steel brace, buckling restrained brace, and H-BRB were compared in terms of the roof displacement, the roof acceleration, hysteresis loops. It was concluded that H-BRBs show good performance for the wind load and have improved the high-rise building performance at a serviceability level.