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선택적 레이저 용융 공정시 공정 변수가 적층형상에 미치는 영향
성민영(M. Y. Sung),주병돈(B. D. Joo),김은화(E. H. Kim),김수희(S. H. Kim),문영훈(Y. H. Moon) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
Selective laser melting (SLM) is a fast growing process of rapid production for metallic based parts. The influence of processing variables such as powder, laser output power, and scan rate on the densification. Therefore a study on fabrication Fe-Cr-Ni powder by selective laser melting has been performed. In this study, the effect of the process parameters on shape of the fabricated part in the selective laser melting process is investigated by analysis of variance such as the height, depth of the fabricated part. With energy density decrease, the height and depth were decreased. Although the conditions are of the same energy density, the shape is different by laser power and scan rate. The shapes according to laser parameters were divided into 3 groups. And the Type Ⅱ is obtained under the conditions as 50㎛ of spread powder height, more than 15㎛ of pulse width.
김수희,이상원,이성구,송해범 대구대학교 과학기술연구소 1998 科學技術硏究 Vol.5 No.2
This study was conducted to investigate the effect of cryopreservation of human Blastocysts by slow freezing. To investigate the effect of slow freezing, the pregnancy and implantation rate of frozen embryo transfer (162 cycles) were compared with those of fresh embryo transfer (568 cycles). The frozen embryo transfer was classified to Group Ⅰ (145 cycles, normal patients) and Group Ⅱ (17 cycles, the patients of ovarian hyperstimulation syndrome), then, the survival, pregnancy and implantation rate were examined. The results of this study were as follows: 1. The pregnancy and implantation rate of frozen embryo transfer were 44.6% and 25.7%. and those of fresh embryo transfer were 40.2% and 22.7% respectively. 2. The survival and pregnancy rate of Group II were higher than those of Group Ⅰ. but there were no significant difference. The implantation rates of Group Ⅰ and Ⅱ were similar.