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경화식에 따른 S-rail 성형공정에서 스프링백 모드 비교
김세호(S. H. Kim),이명규(M. G. Lee),최병현(B. H. Choi),이진우(지음),김홍규(H. K. Kim) 한국소성가공학회 2012 금형가공 심포지엄 Vol.2012 No.9
Springaback modes are quantitatively compared according to the hardening model in the finite element simulation of the stamping process of an S-rail. For comparison of the hardening model, this paper selects isotropic hardening model and Yoshida-Uemori model. From the analysis result, it is noted that the angle change in the flange part is predicted more accurately with kinematic hardening model.
제 2 형 당뇨병에서 미세혈관 합병증과 대혈관 합병증의 대비
강문호,이기영,정연실,김홍규,서찬종,송광식,박혜영,이원기 대한당뇨병학회 2001 Diabetes and Metabolism Journal Vol.25 No.2
Background: Type 2 diabetes is a heterogeneous disease. As to its complications, microangiopathy predominantly develop in some patients while macroangiopathy is more predominant in others. Therefore, this study was performed to identify the factors associated with such dissociation. Methods: Type 2 diabetic patients were classified into the macro and microangiopathy groups by carotid intima-medial thickness (IMT) and the presence of severe diabetic retinopathy. Patients with IMT ≤ 0.83 mm and severe NPDR or PDR were assigned to microangiopathy group; those with IMT 0.84 mm and no diabetic retinopathy were assigned to macroangiopathy group. Of 95 patients studied, 14 were classified as microangiopathy group and 20 as macroangiopathy group. Results: When the microangiopathy and macroangiopathy groups were compared, the microangiopathy group were significantly younger at the time of examination and at the onset of diabetes, and had longer duration of diabetes. Percentage of patients receiving insulin treatment was significantly higher and plasma C-peptide significantly lower in the microangiopathy group. However, HDL-cholesterol levels were significantly lower in the macroangiopathy group. Furthermore, the multiple logistic regression analyses revealed that younger onset of type 2 diabetes was an independent factor that was associated with the acceleration of microangiopathy. Conclusion: This study suggests that the age at onset of diabetes is an important independent risk factor that is associated with predominant development of microangiopathy in type 2 diabetic patients.