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Ti-Ni계 합금분말의 미세조직 및 상변태거동에 미치는 밀링조건의 영향
강상호,남태현 한국분말야금학회 2001 한국분말재료학회지 (KPMI) Vol.8 No.1
Ti-50Ni(at%) and Ti-40Ni-10Cu(at%) alloy powders have been fabricated by ball milling method, and their microstructure and phase transformation behavior were investigated by means of scanning electron microscopy/energy dispersive spectrometry, differential scanning calorimetry (DSC), X-ray diffractions and transmission electron microscopy. In order to investigate the effect of ball milling conditions on transformation behavior, ball milling speed and time were varied. Ti-50Ni alloy powders fabricated with the milling speed more than 250 rpm were amorphous, while those done with the milling speed of 100rpm were crystalline. In contrast to Ti-50Ni alloy powders, Ti-40Ni-10Cu alloy powders were crystalline, irrespective of ball milling conditions. DSC peaks corresponding to martensitic transformation were almost discernable in alloy powders fabricated with the milling speed more than 250 rpm, while those were seen clearly in alloy powders fabricated with the milling speed of 100 rpm. This was attributed to the fact that a strain energy introduced during ball milling suppressed martensitic transformation.
강상호 영산대학교 1999 영산논총 Vol.4 No.-
Regional antagonism or regionalism has been blamed as an endemic problem in Korean politics. Politic is often said to be the major cause of regional antagonism, but the press also has been blamed as magnifying antagonistic sentiment and regional stereotypes. Especially, local newspapers with their emphasis on local viewpoint, has often aggravated such problems. This paper examines the local newspaper's coverage of political issues in Pusan area. The issues include the presidential election in 1997, the first formation of cabinet by president Kim Dae-Jung, and the mass rally in Masan held by Hannara Party, the oppositional party. The results indicate that all local newspapers reveal serious degree of regional bias. Based on the analysis, this paper also makes some practical proposals to overcome the problems.