• Title/Summary/Keyword: 순조

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The Opening Efficiency of Anchovy Boat Seine (권현망어구의 전개성능)

  • An, Yeong-Su;Jang, Chung-Sik;Lee, Ju-Hui
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.33 no.2
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    • pp.118-131
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    • 1997

  • An opening efficiency experiment of anchovy boat seine has been carried out using a half size of the ordinary seine to reduce the size of the seine net and to improve the fishing efficiency from field operation. The intervals of towing boats were set at 100, 200 and 300m, and the towing speed, at 0.6, 0.9, and 1.2k't by possible combinations of them. The vertical openings of wing net, inside wing net, bagnet and flapper as well as the spreads of the seine net and the towing tension of the warp were measured, to find out efficient fishing gear and method of the anchovy boat seine. The results obtained are as follows : 1. The vertical opening of the inside wing net ranged from 8.7m to 12.0m at the normal current and from 7.0m to 10.0m at the counter current, and that of the wing net, from 8.4m to 19.8m at the normal current and from 4.9m to 16.3m at the counter current. The vertical opening of the wing net and inside wing net decreased as the towing speed and intervals of the boats increase, from 66% to 16% and from 32% to 18% of the normal opening, respectively. 2. The vertical opening of the fore of bag net ranged from 7.9m to 12.8m at the normal current and from 7.4m to 9.7m at the counter current, and that of the flapper, from 3.4m to 5.1m at the normal current and from 4.4m to 5.1m at the counter current, and that of the flapper, from 3.4m to 5.1m at the normal current and from 4.4m to 5.1m at the counter current. The vertical opening of the bag net was from 98% to 57% of the normal opening and the flapper showed a circular shape and it rose up to the upper layer with a slower towing speed. 3. The vertical opening of the end of the bag net ranged from 7.1m to 9.3m at the normal current and from 7.4m to 8.8m at the counter current. The end of the bag net rose up to the upper layer, This phenomenon was more apparent as the towing speed and the interval of the boats increase. 4. The towing tension of the experimental nets increased from 648kg to 2,716kg at the normal current and from 1,050kg to 6,010kg at the counter current with increasing towing speed. 5. The net depth of the anchovy seine was stable with the higher towing speed and the wider interval of the boats, but it was unstable by rising up to the upper layer with the lower towing speed and the narrower interval of towing boats.

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Incremental Excavation Analysis of Fluid-Saturated Ground (고체/유체 혼합체 이론모델에 의한 지반굴착해석)

  • 구정회;홍순조
    • Computational Structural Engineering
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    • v.6 no.2
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    • pp.17-22
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    • 1993

  • 본 고에서는 다공매체에서 고체/유체의 상호작용을 조합해석할 수 있는 유한요소모델 개발현황을 살펴보고 이를 이용하여 다공매체의 단계적 굴착 시뮬레이션을 수행할 때 현재 널리 사용하고 있는 전응력해석에 의한 결과와의 차이점을 살펴보고자 한다.

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Economic of Nuclear Power Generation (원자력발전의 경제성 - 영국의 경우)

  • 대한전기학회
    • 전기의세계
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    • v.20 no.6
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    • pp.44-49
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    • 1971

  • 본고에서는 영국의 원자력계획의 가능규모와 이를 위한 경제적 배려의 점에서 원자력에 대한 전망을 고찰하고 다음에 모든 것이 순조로우면 1980년대 후기에 가서 발전설비계획을 석권한 초속로계통을 예로들어 연구개발, 발전소건설, 연료공급을 포함한 전반적인 산업양태에 대하여 검토한다.

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