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경량탄소섬유(CFRP) 소재 50피트급 파워요트 저항특성에 관한 연구
정우철(Uh-Cheul Jeong),류철호(Cheol-Ho Ryu),오대균(Dae-Kyun Oh),홍기섭(Ki-Sup Hong) 한국해양공학회 2014 韓國海洋工學會誌 Vol.28 No.6
The resistance performances were studied for two 50-ft-class power yachts made at carbon fiber reinforced plastic (CFRP) with different hull form characteristics using model tests. The tests were carried out at a high-speed circulating water channel (CWC) for the 16-38 knot range. The total resistance, trim, and sinkage were measured, and the results were compared with wave patterns. The results showed that a chine position at the draft line had a strong effect on the planning performance and resistance performance in a certain velocity range.
고속 쌍동형 낚시 레저보트 선형개발과 저항성능에 관한 연구
정우철(Uh-Cheul Jeong),권수연(Soo-Yeon Kwon),최지훈(Ji-Hoon Choi),김도정(Do-Jung Kim),홍기섭(Ki-Sup Hong) 한국해양공학회 2013 韓國海洋工學會誌 Vol.27 No.6
A 25ft class fishing leisure boat is developed, and the resistance performances are investigated by a model test in a high-speed circulating water channel. The design speed of the developed ship is 25 knots using a 150 ps outboard engine. A catamanan type hull form using a planing section is adopted considering the Froude number and large deck area. The effect of a center body attached on the bottom of the cross deck is studied under various conditions. Wave patterns are observed to make clear the relationship between the resistance performance and the wave characteristics. The results show that the shape of the center body and the position of the chine line can have a strong effect on the resistance performance in a certain velocity range.
洪起燮 弘益大學校 1985 弘大論叢 Vol.17 No.2
There are many studies on the bond mechanisms between concrete and deformed bars in reinforced concrete structures. The mechanisms are consisted of 3 actions; These are, chemical adhesion, friction, bearing by steel ribs. In this study, the factors that affect the bond mechanism between concrete and deformed bars were investigated. Analytical modelings for F.E.M. were also studied.
콘크리트와 異形철근의 附着機構에 관한 연구(Ⅱ) : On the Bond of Tensile Lap Splice Tensile Lap Splice에 관하여
洪起燮 弘益大學校 1986 弘大論叢 Vol.18 No.2
Reinforced concrete structures frequently contain tensile lap splices upon which their structural integrity depends. The factors that affect the splitting failure patterns of the lap splice are the strength of concrete, clear cover, clear spacing between bars, transverse reinforcements, splice staggering pattern, moment gradient, splice length, mode of failure, and casting position. In this study, the factors, the bond stress transfer in lap, and the proposed empirical equations for splitting bond stregnth were studied.