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Ni-Co 합금강의 기계적 특성에 대한 탄소함량의 영향
최병기(Byung-Ky Choi),장경천(Kyeung-Cheun Jang),최병희(Byung-Hui Choi),이기안(Kee-Ahn Lee) 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.5
This study was to evaluate the effect of carbon content on metallic change and fatigue characteristics with Fe-29%Ni-17%Co, low heat expansion alloy, widely using electronic components, precision machines, and sealing with glass and metal etc. The steels were fabricated with variation of carbon content, 0, 0.03, 0.06, 0.1, and 0.20% with VIM and tensile test and fatigue test were performed to achieve the above purpose. The more carbon content, the higher hardness value and yield strength. But elongation of 0.03%C, 0.06%C, and 0.10%C specimen decreased about 2.2%, 1.5% and 0.8% respectively more than that of the base metal. Especially the strength and elongation of 0.20%C specimen increased simultaneously about 14.4% and 7.5%. Fatigue life of 0.03%C specimen decreased but the more carbon content, the higher fatigue life over 0.06% carbon content more than that of base metal.
천선아,최병기,정춘식,이대위,이은방,Cheon, Seon-Ah,Choi, Byung-Kee,Jeong, Choon-Sik,Li, Da-Wei,Lee, Eun-Bang 한국생약학회 2000 생약학회지 Vol.31 No.2
From our previous report, the water extract of Pulsatilla koreana root was found to have potent anti-inflammatory and analgesic actions in intravenous administration in animals. Among chloroform, ethyl acetate, butanol and water fractions which were obtained through successive fractionation of the extract, only the water fraction was found to have the antiinflammatory and analgesic actions. The fraction did not affect normal body temperature at the effective doses in mice and showed low acute toxicity of which $LD_{50}$ was less than 500 mg/kg i.v. in mice. It is interesting that its anti-inflammatory action might be attributed in part to inhibition of cyclooxygenase-1 and -2.
천선아(Seon Ah Cheon),최병기(Byung Kee Choi),김성연(Seung Yeun Kim),이은방(Eun Bang Lee) 한국응용약물학회 2000 Biomolecules & Therapeutics(구 응용약물학회지) Vol.8 No.3
The root extract of pulsatilla koreana has been used as antibacterial, antiparasitic and anti-inflammatory analgesic agents in Traditional Medicine in Korea. Thus anti-inflammatory and analgesic actions of the methanol and water extracts of the root were investigated by administration in oral and intravenous route. From the results, it is concluded that the extracts exhibited the potent anti-inflammatory and analgesic actions in intravenous administration, but did not show the actions in oral administration in animals.