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Al-6%Cu-0.4%Zr(Supral 100)합금의 온도와 변형 속도에 따른 초소성 특성 연구
최원호,박율민,김현철,신평우 國立 昌原大學校 産業技術硏究所 2000 産技硏論文集 Vol.14 No.-
Superplastic materials have a characteristics to undergo large uniform strain prior to failure. Superplasticity usually indicates that elongation to failure in the uni-axial tension is above 200%. There are several superplastic materials to be elongated up to 1000%. The microstructures were evaluated with temperature changes just before superplastic deformation in static recrystallization experiments, and it was found that amount of recrystallization was small below 425℃ and grain coarsening occured above 475℃ as ZrAl₃precipitation lost in inhibiting ability grain coarsening. Therefore optimum superplastic forming temperature proved 450℃. Optimum strain rate sensibility at superplastic tensile test was ?? reasonable.
한덕종,김인구,김석구,박건춘,민병철 울산대학교 의과대학 1992 울산의대학술지 Vol.1 No.1
Primary candidate for pancreas transplantation is patients with type Ⅰ diabetes mellitus of juvenile oneset. At present the patients selected for transplantation often have end stage renal disease, far advanced vascular disease and diabetic neuropathy. In these days, the survival of pancreas transplantation for treatments of patients with type Ⅰ diabetes mellitus has been improved especially in simultaneous pancreas and kidney transplantation. Various innovations in immunosuppression, management of the pancreatic ductal exocrine secretion, recipient selection and HLA matching have been contributed to achieve a reasonable outcome in pancreas transplantation compared with other organ transplantation. Current improved graft survival has stimulated many centers in the world to start pancreas transplantation program. Recently we successfully performed the first case of simultaneous pancreas and kidney transplantation in Korea. After 5 cases of pancreas transplantation in our department in type Ⅰ DM, we think that it is the time to review the pancreas transplantation to give an insight of this new field to our colleagues.