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기존선 속도향상을 위한 궤도재료 개선에 관한 기초 연구
원용환(won Yong hoan),김관형(kim kwan hyung),김순철(kim soon cheol),구수환(ku su hwan) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
The original conventional railway was designed to be stand against 150㎞/h and it is still being operated at the present. However, if the speed of train is improved up to 200㎞/h in the near future in order to get competitiveness, we examined how the speed effect on the rail and we analyzed the effect of vibration, the stress and the displacement of the rail material by the change of the speed and the change of the property of matter through the hydrostatical and the dynamic analysis about the absence of the rail. As the result of the analysis by the above method, we got the prove that the best synthetic hardness of the rail is 75±10KN/㎜. Therefore, it is proved that rail pad has to be improved.
원용환(Yong Hwan Won),이근홍(Gen Hong Lee),김명희(Myeng Hye Kim),김정렬(Jung Yeul Kim),손미정(Mi Jung Son),심대석(Dae Seok Shim),김성욱(Seong Ook Kim),이옥재(Og Jae Lee),김영채(Young Chae Kim) 대한내과학회 1995 대한내과학회지 Vol.48 No.2
The incidence of metastatic uterine choriocarcinoma to the bowel is rare. In general, trophoblastic tumors are highly vascular tumors, metastatic tumors are often hemorrhagic. Metastatic choriocarcinoma to the jejunum is characteized by highly vascular tumor, and superior mesenteric artery angiography demonstrated a hypervascular tumor stain at the terminal branch of the jujunal artery. However, lower intestinal bleeding as a first manifestation of metastatic choriocarcinoma to the jejunum is very rare. We experienced a case of the metastatic choriocarcinoma of jejunum with metastasis to the lung and liver that occurred after hysterectomy of the hydatidiform mole. The patient had suffered from massive lower intestinal bleeding. After the arteriography, resection of tumor and jejunojejunostomy was performed.