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Risk Analysis of VLCS based on Trend of Cargo Growth
김운수,이성우,양창호 한국해운물류학회 2009 The Asian journal of shipping and Logistics Vol.25 No.1
Ever since the 1960s, every 10 to 15 years, the size of ships has been upgraded by 1,000 TEU. This trend of upgrading has been maintained due to advances in ship manufacturer’s technologies, and in the carriers’ strategy. It is likely that this strategy will accelerate the trend for carriers to operate VLCSs far earlier than was previously expected. The main aims of using larger containerships are to reduce costs with economies of scale, to maintain the monopoly of the major carriers, and to achieve a high rate of growth. This study will analyze the risk factors for the unexpected growth of container ship size to follow an appropriate size in terms of economic efficiency. The growth of containership size in the coming years is guaranteed. The leading countries of this trend are strong at shipbuilding and shipping, and are trying to expand vessel sizes. Most of the advanced shipbuilding companies keep introducing larger vessels into the market. Main hub ports pursue improvements in their capacity for large-sized vessels by enlarging the port area. It should be noted, however, that to maintain their position in the future there must be continuous monitoring, forecasting, and studying of possible strategies. The leaders of shipbuilding and marine logistics in the future, will be those who optimize and apply new initiatives based on an understanding of economic efficiency with regards to the growth of vessel size.
고순도 단백질 재료 분리를 위한 Lysozyme 농도분석에 관한 연구
김운수,김우식,김용욱 慶熙大學校 材料科學技術硏究所 1995 材料科學技術硏究論集 Vol.8 No.-
In this study the lysis reaction of lysozyme to Micrococcus lysodeikticus cell(ML cell) was investigated to develop the quick and accurate assay technique for lysozyme concentration. For the investigation of the lysis reaction of lysozyme the Michaelis-Menton(M-M) reaction mechanism was applied and Lineweaver-Burk plot was used to calculate the reaction rates. The concentration of lysozyme and ML cell were changed from 2.0 to 10.0mg/l and from 10 to 50mg%, respectively. In these range of concentrations of the lysozyme and ML cell the lysis reaction was good agreement with M-M reaction mechanism and then the maximum reaction constant and Michaelis-Menton constant were measured as 1.40×10^(-2) and 11.08, respectively. These information on the lysis reaction contributes to the better analysis of lysozyme concentration in comparison with conventional procedure.