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특집 - 바이오 플라스틱 업체현황 및 사업화 제품 소개
김운수,Kim, Un-Su (사)한국포장협회 2011 包裝界 Vol.217 No.-
국내 및 해외의 환경인식 변화, 환경 규제 등으로 인하여 바이오 폴리머 경쟁력 강화 요인이 증가되는 가운데, 석유계 플라스틱의 대체가 가능하게 되어 틈새시장을 중심으로 제품 적용이 확대되고 있는 추세이다. '저탄소 문제'가 21세기 들어 전세계적으로 환경문제의 핵심과제로 등장함에 따라 바이오매스(Biomass)를 원료로 하여 제조되는 바이오 플라스틱의 적용분야가 급속하게 확대되고 있다. 바이오매스를 이용해 만든 바이오 플라스틱은 최근 들어 대표적인 친환경 소재로 꼽히고 있다. 사용 후 폐기시 이산화탄소 및 인해 유해물질 발생가능성이 있는, PVC, 비닐, 스티로폼 등 화학플라스틱을 대체하여 제품화되고 있다.
정상교합자에서 골격 형태에 따른 치성 변이에 관한 연구
김운수,김상철 원광대학교 치의학연구소 2003 圓光齒醫學 Vol.12 No.1
It is a useful guidline for diagnosis and treatment of malocclusion to study dental variations in normal occlusion with different facail patterns. The purpose of this study was to evaluate the dentoalveolar compensation related to skeletal pattern in 153 adult(male:92, female:61) with normal occlusion. Cephalometric radiographs were taken with standard method, traced, and digitized. Skeletal patterns of normal occlusion subjects were sagittally classified into three groups by cluster analysis. The measurements were evaluated statistically among the groups by ANOVA and Correlation analysis. The results were as follows; 1. As mandibular position was posterior to the maxilla, the upper incisors inclined more lingually and the upper anterior vertical height was increased to the palatal plane. 2. As mandibular position was posterior to the maxilla, the lower incisors inclined more labially. 3. As mandibular position was anterior to the maxilla, the upper posterior teeth inclined more mesially and the upper posteiror vertical height was increased to the palatal plane . 4. As mandibular position was posterior to the maxilla, the occlusal plane inclined more downward and forward to the SN plane, FH plane and palatal plane.
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.