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발포 폴리스티렌을 사용한 경량콘크리트 패널의 차열 특성
정지용(Jeong Ji-Yong),정갑철(Jeong Gab-Cheol),김진만(Kim Jin-Man) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
To ensure the longevity and endurance of the buildings, Lightweight Panels have been applied a lot, as well as Rahmen and Flat Slab. Among the Lightweight Panels, the one with EPS(Expended Polystyrene), which reinforces weakness in bending strength that exists by attaching CRC(Cellulose Reinforced Cement board) and Mg(Magnesium board) on both sides of the panel, has widely been used. From the complex panel attached, with the CRC and Mg on both sides of the panel, you could expect enhanced fire resistance as well as an improvement in bending strength. Hereupon in this research, I have reviewed the heat-proofing performance of the types of lightweight partitioning boards with EPS and reinforcement. Accordingly I would like to suggest the basic data necessary for evaluating the possibility of using these architectural materials in residental buildings. In my research results, the boards fire resistance performance improved as each board became thicker. There is no significantly different change in the heat-proofing performance of the CRC (THK 3.2) regardless of the attachment, but it has demonstrated improved fire-resistance performance compared with the Mg. Although there is some difference in the fire resistance performance of each panel 50㎜ thick, it appears that this panel is unsatisfactory with the conditions of acceptable fire resistance structures required for its use in multi floor buildings.
연삭을 이용한 Surface Texturing에서 패턴의 기울기 변화
정지용(Ji-Yong Jeong),위전(Yu Zhen),사하르(Sahar M. Sana Ullah),고태조(TaeJo Ko) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.4
Most machines lose a lot of energy due to friction. Wear due to friction also reduces performance. Therefore, it is important to reduce friction on the surface to improve energy efficiency and decrease wear. Surface texturing refers to making patterns on the surface for reducing friction. There are many surface texturing methods, such as using lasers, abrasive jet machining, and so on. Recently, mechanical manufacturing methods, such as cutting and grinding, have been highlighted. Among them, the grinding method has the advantage of making patterns in large areas quickly. Therefore, it is appropriate for surface texturing on large machines. This paper is a study on the slope change of the surface texturing pattern using grinding. Therefore, we researched the slopes of the patterns corresponding to “spindle speed and feed rate” and “curvature of workpiece surface” using a mathematical model and experiment. As a result, we made a proper mathematical model concerning our research. Therefore, using the mathematical model in this paper, we could predict the slope change of the pattern according to grinding conditions.