• 제목/요약/키워드: research and development

검색결과 61,314건 처리시간 0.068초

Estimation of the Efficiency of a Silt Screen using a Vessel-mounted ADCP

  • Jin, Jae-Youll;Park, Jin-Soon;Song, Won-Oh;Kim, Sung-En;Lee, Kwang-Soo;Yum, Ki-Dai;Oh, Jae-Kyung
    • 한국해안해양공학회:학술대회논문집
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    • 한국해안해양공학회 2003년도 한국해안해양공학발표논문집
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    • pp.353-358
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    • 2003
  • As fur quantitative evaluation of the amount of sediments released into the ambient waters by various works fur coastal development, the instrument and method of the measurement of suspended sediment concentration (SSC) are critical for estimating the efficiency of a silt screen to reduce the spreading of sediment plumes generated by coastal works. (omitted)

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Maturation Conditions Affecting on Blastocysts Development and Their Quality in Pig Embryos

  • Kim, Ji-Su;Koo, Deog-Bon;Song, Bong-Suk;Gabbine Wee;Choo, Young-Kug;Lee, Kyung-Kwang;Han, Yong-Mahn
    • 한국동물번식학회:학술대회논문집
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    • 한국동물번식학회 2004년도 춘계학술발표대회
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    • pp.240-240
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    • 2004
  • The modification of in vitro maturation (IVM) conditions should be required to efficient production of matured porcine oocyte in vitro. Estradiol-17β (E₂) as steroid hormone exists in ovarian follicular fluid and plays a major role in ovulation. It has been reported that estradiol as well as other steroids are involved in keeping the oocytes in meiotic arrest. (omitted)

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Population Structure of Minke Whales (Balaenoptera acutorostrata) in the Korean Waters Based upon Mitochondrial DNA Polymorphism

  • Park, Jung-Youn;Kim, Mi-Jung;An, Yong-Rock;Kim, Zang-Kun;An, Hye-Suck;Moon, Hyo-Bang;Kim, Kyung-Kil;Sohn, Haw-Sun
    • Animal cells and systems
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    • 제13권4호
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    • pp.419-427
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    • 2009
  • The Minke whale, Balaenoptera acutorostrata, is the smallest baleen whale in the suborder Mysticeti. Because this species inhabits coastal areas, it became a main target species of coastal small-type whaling in the North Atlantic and the Northwest Pacific Oceans, and the species' population size dramatically decreased because of over-exploitation. As a result, the International Whaling Commission declared a global moratorium on whaling and launched the development of a management procedure for protecting the whales. Morphological studies, whaling history analysis, and genetic studies conducted mainly by Japanese scientists showed the existence of one unique "E" stock that inhabits the waters around the Korean peninsula and mixes with the "O" stock in the southern part of the Sea of Okhotsk. We used the mitochondrial DNA control region polymorphism of 348 Minke whales bycaught or stranded in Korean waters from 30 October 1998 to 25 June 2005 to assess the whale population structure by year. The frequency of the 10 major haplotypes from the 40 identified haplotypes was not significantly different among groups, suggesting that a subpopulation was not present. A comparison of the genetic distances calculated with Tamura-Nei's method showed that the distances between groups were lower than those within groups, which suggests that there was no genetic difference in the Minke whale populations. The Fst comparison between groups and the phylogenetic tree constructed using the unweighted pair group method with arithmetic mean (UPGMA) and Neighbor Joining (NJ) method also detected no obvious sub-stock structure.

Safety Analyses of Process and Facility for the ACP Demonstration

  • You, Gil-Sung;Choung, Won-Myung;Ku, Jeong-Hoe;Cho, Il-Je;Kook, Dong-Hak;Lee, Eun-Pyo;Park, Seong-Won
    • 한국원자력학회:학술대회논문집
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    • 한국원자력학회 2005년도 춘계학술발표회
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    • pp.293-294
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    • 2005
  • The safety analyses and evaluation works on the process and facility for ACP demonstration have been performed. The several safety factors, such as the risk, environmental, radiation, structural, criticality, were analyzed. The analysis results confirmed the reliability of the safety on the ACP process and facility during normal and accident conditions.

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가막만해역 해수의 세균학적 수질 평가 (The Bacteriological Quality of Seawater in Kamak Bay, Korea)

  • 권지영;박큰바위;송기철;오은경;이희정;조미라;김지회;손광태
    • 한국수산과학회지
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    • 제45권5호
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    • pp.460-464
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    • 2012
  • From 1998 to 2008, the bacteriological quality of seawater in Kamak Bay, Korea, was monitored. The total and fecal coliforms in seawater were monitored as bacterial indicators, and the level of fecal coliform contamination was used to evaluate seawater quality. In the southern shellfish growing area of Kamak Bay, the observed fecal coliform geometric mean (GM) and estimated 90th percentile did not exceed the quality standards for fecal coliforms in seawater in Korea and th USA (GM<14 MPN/100 mL, 90th percentile<43 MPN/100 mL). The GM and estimated 90th percentile of the fecal coliform levels in the adjacent northern area of Kamak Bay were higher than in the southern area. Stations near wastewater discharge sites and urban areas in the north had the lowest quality and did not meet the bacteriological seawater quality criteria. The high fecal coliform levels in the Seonso coastal region near wastewater discharges and northern urban areas declined significantly following dredging and operation of a sewage treatment plant.