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윤동섭,이병하,Yoon, Dong-Sup,Lee, Byung-Ha 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.4
인공치과재료인 도재에 백류석(Leucite)결정을 이용해 왔는데, 이는 치과재료에 함께 사용하는 금속재질의 열팽창계수가 크기 때문에 이에 맞추기 위한 것이다. 산업적으로는 카리 장석으로부터 부조화 용융으로 leucite 결정을 합성하여 이용하고 있으며 이는 $1150^{\circ}C$ 이상에서 생성된다. 본 연구는 치과 재료에 사용하는 leucite를 보다 낮은 온도에서 조화 용융으로 합성하기 위한 것이다. 이를 위하여 카리 장석을 주원료로, 그 이외에 탄산칼륨, 수산화알루미늄을 사용하여 화학 양론적인 조성으로 고상합성법을 이용하여 leucite 합성 실험을 하였다. 그 결과 leucite를 조화 용융으로 $950^{\circ}C$부터 고상법으로 합성되었다. Leucite crystal has been utilized for dental porcelain due to its high thermal expansion coefficient to meet its counter metal side. Many industrial applications of leucite from the incongruently melting of potassium feldspar are used and its minimum temperature of crystallization is $1150^{\circ}C$. This study aimed to get leucite crystal from lower temperature through congruently melting, and the starting materials are taken from K-feldspar mainly, and aluminum hydroxide and potassium carbonate are additionally supplied to meet stoichiometry of leucite. We report that the leucite crystal can be synthesized in congruently melting from the temperature $950^{\circ}C$ through solid-state sintering with k-feldspar, potassium carbonate and aluminum hydroxide.
윤동섭 ( Dong Sub Yoon ),조대우 ( Dae Woo Cho ) 한국국제경영학회 2007 國際經營硏究 Vol.18 No.1
Finding the determinants of the choice of foreign market entry by the Korean venture firms can be useful for the others at this time when they have been tried to go abroad. Overseas market environments, entrepreneurial orientation and strategic capabilities of Korean ventures are considered as main concepts in this study. We analysed 200 firms, which are composed of ventures in Daeduck Valley and Seoul Metropolitan Area, the results of the study show that R&D capability, experiences and competition in the foreign markets, and proactiveness are related to foreign market entry of Korean venture firms significantly. Among these four variables, R&D capability of venture firms is shown as the most affective variable explaining the very decision making. It means that the results of this study show the typical pattern of technology-based Korean ventures.