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최경식(Kyungsik Choi) 한국해양대학교 해사산업연구소 1991 海事産業硏究所論文集 Vol.1 No.-
The study focuses the mechanical deformation response predicted by the plasticity model for polycrystalline ice. To describe various deformation characteristics, ice is idealized as a perfectly plastic material using an asymtotic exponential failure criterion. This criterion is suited for describing materials which exhibit brittle deformation at low hydrostatic pressure and ductile deformation at high hydrostatic pressure. The results are compared to those of continuum damage mechanics model. Plasticity model shows good agreement with damage model and experimental results for high confining pressures even. at high strain-rates which is usually considered as a brittle condition under uniaxial compression.
최경식(KYUNGSIK CHOI),이상갑(SANG-GAB LEE),손경호(KYOUNG-HO SOHN),신맹기(MAENG-KEE SHIN) 한국해양공학회 2000 韓國海洋工學會誌 Vol.14 No.1
This study focuses on a simple analytical approach to calculate crane lifting forces for a sunken ship. The method takes into account the relation of lifting forces acting in wire rope slings to the inclination of the vessel including the effect of lug positions. The importance of the sunken ship salvage is explained from the statistics of ship casualties during last 15 years. Euler angles are introduced to represent the inclination of a sunken ship in developing the static force and moment equations. Three dimensional examples with one redundant degree of freedom for a GT1500 oil tanker are analyzed and the results show that the information obtained by the method could be useful to salvors to conduct salvage work.
최경식(KYUNGSIK CHOI) 한국해양공학회 2006 韓國海洋工學會誌 Vol.20 No.3
In this study, design parameters of ice-transiting vessels in the world, currently in service or under construction, were collected and a database of principal particulars for each ship was established. To understand the recent design trend, ice-transiting vessels were categorized into four groups, i.e., conventional icebreakers, icebreaking tug/supply/research vessels, ice-strengthened passenger/car ferry and ice-strengthened cargo vessels. Changes in principal particulars for each group were reviewed and summarized. It was found that the most significant change in the design of ice-transiting vessels was the increment of large size commercial cargo vessels. It is believed that the recent hike of oil prices and booming of Russian economy has resulted in the need for year-round operation with bigger ships in the Baltic Sea and in the Sea of Okhotsk and also along the Northern Sea Route in Russian Arctic Sea.
농업부문 신생 협동조합 사업활성화 요인과 네트워크 영향탐색에 관한 연구 -협동조합 유형별 특성과 사례를 중심으로-
최경식 ( Kyungsik Choi ),남기포 ( Gi Pou Nam ),유형석 ( Hyoungsuk Yoo ) 한국협동조합학회 2015 韓國協同組合硏究 Vol.33 No.2
This study analyzes determinant factors for sustainability of the new agricultural cooperatives established by the Framework Act on Cooperatives of 2012 in Korea. It was found that the most explanatory variable was the business network of cooperatives to increase their business turnovers. Based on this result, the study suggested to build a suitable network model for different kinds of cooperatives. producer cooperatives and employees cooperatives in rural area will do better to build their business networks with same sector cooperatives in urban area to create a firm business relationship in applying the cooperation among cooperatives principle, whilst reducing the asymmetric information between two areas. It was also found that consumer cooperatives and multi-stakeholders cooperatives had their comparative advantages in accessing a lower price and high quality goods from producer cooperatives and employees cooperatives. Therefore, it is recommendable especially for multi-stakeholders cooperatives to be organized by a localized business networks from the startup. Empirically, a business network model established in Hwasung City in Gyeonggi Province provided many implications to interested policy makers, new cooperatives and local agricultural cooperatives who wish to construct a value-chain business network in a region among the three parties. Through the network, the primary production cooperatives can acquire their stable relationships and sustainabilities in the future and contribute to development to the area.
최경식(KYUNGSIK CHOI),이종호(JONG-HO LEE) 한국해양공학회 2002 韓國海洋工學會誌 Vol.16 No.1
The interaction of grounded ice ridges with underlying seabed is one of the major considerations in the design of Arctic pipeline system. Previously several ice scour models were developed by researchers to describe the ice scour-seabed interaction mechanism. In view of possible improvements, a comparative study of those ice scour models is performed and their limitation in modeling is discussed. Simple laboratory tests are carried out and then the shape pattern of deposited soil around the ice model is newly defined. Unlike the rectangular idealization of an ice block, in this modified ice scour model, trapezoidal cross sections are assumed to represent the typical shape of an ice ridge based on the field observation data. With the horizontal and vertical motion of ice model, the ice scour depth and soil reacting forces on seabed are calculated with varying the keel angle of an ice ridge.