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인코넬 합금의 미세조직과 기계적 특성에 미치는 냉각속도 영향
박노경,이호성,채영석,Park, No-Kyeong,Lee, Ho-Seong,Chai, Young-Suck 한국재료학회 2007 한국재료학회지 Vol.17 No.10
The mechanical properties and microstructure of Inconel 690 and 600 alloys with various cooling rates were investigated. Optical microscopy and scanning electron microscopy observations indicated that in case of the cooling rate of $0.5^{\circ}C/min$, discontinuous carbides along the grain boundaries were formed and when the cooling rate was $10^{\circ}C/min$, continuous carbides were formed in Inconel 690 and 600 alloys. For the annealed Inconel 690 alloy with high Cr content, a lot of annealing twins, which led the preferential growth of (111) planes, were observed. However, the annealed Inconel 600 alloy with low Cr content showed a few annealing twins and the preferential growth of (200) planes. Inconel 600 alloy had a larger value of ultimate tensile strength (UTS) than Inconel 690 alloy.
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효율적인 국내은행의 순위변화 측정 : Super효율성접근
박노경 대한경영학회 2003 大韓經營學會誌 Vol.16 No.1
The measure of super-efficiency was put forward by Andersen and Petersen(1993) as a way to distinguish between the efficient observations. In particular the super-efficiency measure examines the maximal radial change in inputs and/or outputs for an observation to remain efficient, i.e. how much can the inputs be increased(or the outputs decreased) without becoming inefficient. The larger the value of the super-efficiency measure the higher an observation is ranked among the efficient units. The purpose of this paper is to determine rankings of the efficient Korean banks using super-efficiency method with the trend change of rankings of those efficient banks during 6 years(1995-2000) for 3 inputs(labour, fixed assets, number of branches) and 3 outputs(loans, deposits, and equity). The main empirical results of this paper are as follows. First, the ranking order of efficient banks under super CCR model is Shinhan, Boram, Hana, Korea First, Hanil Banks before IMF supervision system, and after IMF system, Boram, Hana, Shinhan, Foreign Exchange, and Pyunghwa Banks. Second, the top ranked efficient banks under super BCC model are Choheung, Commercial, Foreign Exchange, and Kookmin Banks before IMF system, and after 1998, Kookmin, Hanvit, Housing, and Pyunghwa Banks. The policy implications to the Korean banks and planners are as follows. First, inefficient banks should choose the highest banks which are recommended by Super-efficiency method among the efficient banks as the benchmarking bank for the purpose of introducing the management way to enhance the inefficient bank's efficiency. Second, FSS(Financial Supervisory Service) should introduce the new methods for enhancing the efficient banks' efficiency further more
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