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지석만,최주호,김준범,하덕식 한국 항공대학교 항공산업기술연구소 2001 航空宇宙産業技術硏究所 硏究誌 Vol.11 No.-
This paper addresses a method for numerical simulation in the pressing process of hot glass. Updated Lagrangian finite element formulations are employed for the flow and energy equations to accommodate moving meshes. The model is assumed axi-symmetric and creep flow is assumed due to the high viscosity. Commercial software ANSYS is used to solve the coupled flow and energy equations. Moving contact points as well as free surface during the pressing are effectively calculated and updated by utilizing API functions of CAD software Unigraphics. The mesh distortion problem near the wall is overcome by automatic remeshing, and the temperatures of the new mesh are conveniently interpolated by using a unique function of ANSYS. The developed model is applied to the pressing process of TV glasses. In conclusion, the presented method shows that the pressing process accompanying moving boundary can be simulated by effectively combining general purpose softwares without resorting to special dedicated codes.
지석원,서치호,Ji, Seok-Won,Seo, Chee-Ho 한국건설순환자원학회 2006 한국건설순환자원학회지 Vol.2 No.2
The total production of the smelted copper reaches 450,000 tons per year, and the production of copper-related goods grows year by year owing to the extension of facilities and the development of production techniques. On the other hand, the volume of slag discharges by-produced at the time of copper smelting process is also on trend of increase. The by-produced copper smelting slag amounts to 700,000 tons a year, which is one and half times of the total smelted copper production. Accordingly nobody disagrees that comprehensive researches on how to deal with and how to reuse the accumulated smelting copper slag have to be encouraged. Even though the possible uses of the copper smelting slag have being made on various levels at present as materials for iron powder cement, sand-blasting and fire-proofing rock wool, but a considerable volume of the slag is abandoned as unnecessary by burying or piling up in careless in the open ground.
동제련슬래그를 사용한 콘크리트의 물리적 특성 및 중성화에 미치는 영향
지석원,유택동,이세현,전현규,서치호 대한건축학회 2002 大韓建築學會論文集 : 構造系 Vol.18 No.7
The purpose of this study is to investigate properties of durability of the concrete which contains Copper Smelting Slag(CSS) substituted as a fine aggregate according to different mixing ratio of CSS. The test that included two slump-type was executed with changing the different mixing ratio of CSS substituted as a fine aggregate into 0, 25, 50, 75, 100%, and the results of this study are as follows;