• Proceedings of The Korean Society of Health Promotion Conference
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• 2009.05a
• /
• pp.88-89
• /
• 2009

• Proceedings of the Korean Institute of Surface Engineering Conference
• /
• 1999.05a
• /
• pp.144-145
• /
• 1999

• 한국과학교육학회:학술대회논문집
• /
• 2008.01a
• /
• pp.133.2-133.2
• /
• 2008

• 한국항공운항학회:학술대회논문집
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• 2007.06a
• /
• pp.117-120
• /
• 2007

• Proceedings of the Korean Aquaculture Society Conference
• /
• 2006.05a
• /
• pp.436-441
• /
• 2006

• Bulletin of the Korean Space Science Society
• /
• 2002.10a
• /
• pp.69-69
• /
• 2002

• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2007.05a
• /
• pp.213-214
• /
• 2007

• Proceedings of the KHMA Conference
• /
• 2013.05a
• /
• pp.119-156
• /
• 2013

• Korean Journal of Plant Resources
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• v.14 no.1
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• pp.43-47
• /
• 2001

For the purpose of sweet potato varietal improvement, yulmi, shinyulmi, gunmi, hongmi and seonmi, whose source and sink are different one another, were cultivated at different amount of fertilizers, and then defoliation at initial stage of tuberous root weight increase on the relation of source and sink was observed as follows. The response of stem, leaf and tuberous root weight by amount of fertilizer and defoliation rate of sweet potato varieties was different. Stem and leaf weight increased along with heavy dressing by the following order; shinyulmi> seonmi> hongmi> gunmi> yulmi. Tuberous root number was the most at $N-P_2O_5-K_2O=60-70-190kg/ha$ amount of fertilizer, showing seonmi the most number. The number of stem, leaf and tuberous root increased along with the lowered rate of defoliation. In case of $N-P_2O_5-K_2O=20-30-90kg/ha$ amount of fertilizer, tuberous root weight increased by increase of stem and leaf weight up to 50% defoliation and the difference of stem, leaf and tuberous root number was low as defoliation rate increases. The total dry weight matter was the most at heavy dressing amount of fertilizer.

• Journal of Ocean Engineering and Technology
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• v.20 no.3 s.70
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• pp.88-95
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• 2006

The resistance characteristics of a trimaran are studied, varying the bottom profile and transom stern of the main hull. The bottom profile is varied in three cases (convex, flat, concave). Using the experimental and numerical methods, the resistance performance of each hull form is compared. The experiments are carried out in ship model basin, and the numerical simulations are performed by a finite-difference method, based on the Marker and Cell scheme. Euler and continuity equationsare used for the governing equations of the flaw field around a trimaran with transom stern. The agreement of both results is good. The optimal bottom profiles for transom stern are presented for law-speed and high-speed regions, respectively.