• 제목/요약/키워드: Comparision

검색결과 881건 처리시간 0.027초

주성분분석 및 군집분석을 이용한 컨테이너항만의 분류 (Classification of International Container Ports by Using Principal Component Analysis and Cluster Analysis)

  • 문성혁;이준구
    • 한국항만학회지
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    • 제13권1호
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    • pp.11-26
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    • 1999
  • The subject of port efficiency is one of the important issues facing port authorities and policy makers today. A number of studies have been undertaken which compare ports in terms of their efficiency. But any port comparison can only be valid and meaningful if a port’s efficiency is compared with a similar port. The main objective of this paper is to introduce a systematic approach to identifying similar ports based on the technique of principal component analysis and cluster analysis. And it seeks to identify the most important factors underlying the port classification. Lack of awareness of which factors differentiate ports has resulted in an unnecessary collection of data which are of limited use in port classification. This paper has identified five groupings of similar ports within which port comparision can be justifiably made. This approach can be used for any future port comparision.

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반복하중을 받는 철근콘크리트 프레임면내 조적벽체의 골조 구속에 따른 구조성능 평가 및 개선 (Improvement and Evaluation of Structural performance of Reinforced Concrete Infilled Masonry Frame with Restraining Factor of Frame under Load Reversals)

  • 신종학;하기주;김광연;이희종;남왕교
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2001년도 봄 학술발표회 논문집
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    • pp.541-546
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    • 2001
  • Experimental programs were accomplished to improve and evaluate the structural performance of test specimens, such as the hysteretic behavior, the maximum horizontal strength, crack propagation of and ductility etc. Test variables are restraining factors of frame, with or without masonry infilled wall, and masonry method Six reinforced concrete rigid frame and masonry infilled wall were tested and constructed in one-third scale size under vertical and cyclic loads simultaneously. Based on the test results, the following conclusions can be made. For masonry infilled wall with restraining factors of frame, maximum horizontal capacities were increased by 1.91~2.24 times in comparision with that of rigid frame. For masonry infilled wall with restraining factors of frame(IFWB-l~3), cumulated energy dissipation capacities wear increased by 1.35~l.60 times in comparision with that of masonry infilled wall(IFB-1) at final stage of testing.

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철근콘크리트 프레임면내 조적벽체의 내진성능개선 기술 개발 (Development of Technique for Improvement of Earthquake-Resistant Performance of Reinforced Concrete Infilled Masonry Frame)

  • 신종학;하기주;최민권;권중배;남왕교
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2001년도 가을 학술발표회 논문집
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    • pp.1143-1148
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    • 2001
  • Experimental programs were accomplished to improve and evaluate the structural performance of test specimens, such as hysteretic behavior, maximum horizontal strength, crack propagation, and ductility etc. Test variables are restraining factors of frame, with or without masonry infilled wall, and masonry method. Six reinforced concrete rigid frame and masonry infiiled wall were constructed and tested in one-third scale size under vertical and cyclic loads simultaneously. Based on the test results, the following conclusions can be made. For masonry infilled walls with restraining factors of frame, maximum horizontal capacities were increased by 1.26~2.24 times in comparision with that of rigid frame. For masonry infilled wall with restraining factors of frame(IFWB-1), cumulated energy dissipation capacities wear increased by 1.60 times in comparision with that of masonry infilled wall(IFB-1) at final stage of testing.

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인삼사포닌 분획이 단백부족 마우스의 면역체계에 미치는 영향 (Studies on the Effects of the Saponin Fraction of Panax Ginseng on the Immune System of the Mouse Fed with Protein Malnutritive Diet)

  • 이나경;김영중
    • 약학회지
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    • 제30권4호
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    • pp.174-179
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    • 1986
  • The thymus weight of the mouse was 54.1% in protein malnutritive diet group and 39.2% in group treated with saponin fraction of Panax ginseng in comparison to normal diet group. This decreasing effects of protein malnutritive diet and saponin fraction on the thymus weight practically disappeared after four weeks. The saponin fraction showed no effect on the spleen weight of the mouse. The supplement of the saponin fraction enhanced total peritoneal exudate cells, content of total serum protein and albumin content of the mouse, each 45, 8 and 10% respectively in comparision to that of normal diet group. And these values in protein malnutritive diet group were 61.2, 83.6 and 87.0% respectively in comparision to that of normal diet group, and recovered to the level of normal diet group by the supplement of the saponin fraction. The electrophoregram of the serum protein of the mouse fed with protein malnutritive diet was different from that of the mouse fed with normal diet, but this difference practically disappeared by the supplement of the saponin fraction.

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톱니파 및 삼각파 프로브 bias 전압에 의해 측정된 전자에너지 분포함수의 비교에 관한 연구 (A Study on the Comparision of Electron Energy Distribution Function measured by sawtooth and triangle waveform probe bias voltages)

  • 김두환;신중흥;김규섭;박영찬;조정수;박정후
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1996년도 하계학술대회 논문집 C
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    • pp.1844-1847
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    • 1996
  • In the paper, we have obtained electron energy distribution function (EEDF) in plasma by using two differentiators. In addition, we have investigated the comparision of the EEDFs by sawtooth and triangle waveform voltages. It is found that as pressure is decreased, electron density is decreased, and plasma potential is increased. And as the position of probe moves the outer of plasma, plasma potential is decreased, and electron temperature is decreased.

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