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김정구,신일성,금동화,Kim, Jung-Gu,Shin, Il-Seong,Kum, Dong-Hwa 한국재료학회 1999 한국재료학회지 Vol.9 No.7
마그네슘은 20여년간 자동차 산업에서 휠소재로 사용되어 왔다. 마그네슘 휠은 무게가 알루미늄 휠보다 25% 가벼워서 주행성이 우수하다. 이 연구의 목적은 사형주조 및 영구금형주조 공정에 의한 AZ91D 합금제 췰을 개발하는 것이다 보호개스$(SF_6+CO_2)$를 사용하는 비플럭스 용해기술을 적용하여 용탕의 산화와 불순물의 유입을 배제하였다 마그네슘 용탕은 가압식 펌프시스템을 사용하여 가열된 파이프를 통하여 모울드에 자동으로 공급된다. 열처리 및 인고트의 조성에 따른 AZ91B 합금제 휠의 기계적 특성을 조사하였다. Magnesium has been used as wheel materials in the automotive industry for more than 20 years. The magnesium wheels, which are lighter by 25% than aluminum wheels, provide easy controllability providing excellent road holding by the reduction of weight. The purpose of this work is to develop cast AZ91D alloy wheel by sand cast and permanent mold cast. The fluxless melting with the protective gas $(SF_6+CO_2)$ was Performed to eliminate oxidation of melt and impurity. The transfer of molten magnesium to the mold was done by using gas-pressurized Pump system through the heated pipe. The mechanical properites of AZ91D alloy wheel were investigated as a function of heat treatment, ingot composition.
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비대상성 알콜성 및 바이러스성 간경변증사이의 혈소판 감소증 비교
김시영,김창섭,박창영,김병익,이화영,조용균,이상종,금동극,구은실,전우규,이영래,정을순,손정일 대한간학회 2000 Clinical and Molecular Hepatology(대한간학회지) Vol.6 No.2
Background/Aims: Thrombocytopenia is frequently found among patients with chronic liver disease, and its mechanism, especially among patients with decompensated liver cirrhosis had not been established. Therefore to elucidate the mechanism of thrombocytopenia, the relationship between thrombocytopenia and severity of hepatic dysfunction, splenomegaly was measured. We measured the peripheral blood components with splenic volume obtained from a computerized tomography of decompensated liver cirrhosis patients. Methods: We studied 103 patients who had been diagnosed with decompensated liver cirrhosis with esophageal varices and ascites from January 1982 to August 1999. We checked their counts of platelets, albumin, bilirubin, splenic volume, degree of esophageal varices, hepatic encephalopathy and ascites by retrograde methods. Results: In viral liver cirrhosis, thrombocytopenia and splenomegaly correlated well with disease severity but they didn't in alcoholic cirrhosis. Of special note, the platelet count was significantly lower and the splenic volume was larger in the Child C of viral cirrhosis patients group than in the alcoholic group(p$lt;0.05). Conclusion: When we compared decompensated alcoholic with viral liver cirrhosis patients, the degrees of thrombocytopenia and splenomegaly were much less in the former group. The factors for this phenomena are Splenic Pooling theory, Platelet-associated IgG, Thrombopoietin and Toxic Marrow. We suggest that splenomegaly is an important factor among these, but the mechanisms involved in the pathogenesis of this hematologic phenomena are not completely understood. Especially in alcoholic liver cirrhosis, many other factors may be involved, including the direct effect of alcohol to bone marrow, so further studies will be needed to establish whether a causal relationship exists.(Korean J Hepatol 2000;6:215-222)
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