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3차원 유동장 계산을 위한 표면격자의 근사적 곡률 회복
이종윤(J.Y. Lee),김병수(B.S. Kim) 한국전산유체공학회 2017 한국전산유체공학회지 Vol.22 No.3
In this research it is assumed that the geometry modeled in the CAD system is transferred to the grid generation program in the STL data format, and then surface meshing follows. However, there is a problem that the curvature of the original shape is lost in this process of geometry transfer in the STL data format. In order to solve this problem, a study on approximate curvature recovery of the surface mesh for 3D flow field calculation is pursued. The approximate curvature recovery of the surface grid is performed by firstly finding connectivity between cells, and then performing Along-Edge curvature recovery to obtain curvature recovery along the edge, and lastly calculating Cross-Edge slope continuity after which slope-continuity, that is C1-continuity, between neighboring cells is recovered. In order to verify the improvement of geometry and validity of generated surface grid, a sphere, an ellipsoid, and a wing shape were analyzed by using a Panel code, and it was confirmed that the generated surface grid is close enough to the original shape.
비결합형 터널접합구조에서 Cr 하지층에 따른 전자기적 특성변화
박진우(J. W. Park),전동민(D. M. Jeon),윤성용(S. Y. Yoon),이종윤(J. Y. Lee),서수정(S. J. Suh) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.3
Cross-geometrical Cr/Co/Al-Ox/Co/Ni-Fe tunnel junctions were fabricated by magnetron sputtering. To form an insulating layer, The Al layer was oxidized in an atmosphere of oxygen-argon mixture at low power after deposition. To enhance the coercivity of the bottom Co layer, The Cr seed layer was deposited on the glass and it led to increase in coercivity. The coercivity increase is due to the increase of roughness through the Cr thickness. In over oxidation time, the oxidation of Co bottom layer and flat interface of insulator can increase the bottom Co coercivity. But TMR ratio gradually decrease. TMR ratio is relevant with Cr thickness, insulator thickness, and oxidation time. The maximum TMR ratio was 14% at room temperature and the TMR ratio was decreased to half at 0.51 V.
생물반응기 배양에 의한 산삼 수확 후 배양액이 무의 초기 생장에 미치는 효과
유창연 ( C. Y. Yu ),이재근 ( J. K. Lee ),성은수 ( E. S. Seong ),김병준 ( B. J. Kim ),권순성 ( S. S. Kwon ),고은정 ( E. J. Gho ),안형신 ( H. S. Ahn ),이종윤 ( J. Y. Lee ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2009 강원 농업생명환경연구 Vol.20 No.-
In order to investigate the optimal conditions for using recycled liquid medium after cultured a wild Panax ginseng C. A. Meyer, we examined the effect of 100% distilled water and several diluted culture medium on the growth of radish seedlings. Of six conditions tested, in 1:3diluted culture medium, fresh weight was extremely higher and 141.42 g while in distilled water the fresh weight was the lowest. Dry weight of radish was higher in condition of 100% culture medium and as the ratio of cultured medium increased, the dry weight of radish was gradually increased. In this results, culture medium was effective on the growth, fresh weight and dry weight of radish. These results suggested that recycled culture medium of Panax ginseng adventitious roots could be used for producing vegetable radish sprouts, and improving their the functional activity.