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김대곤,성삼경,정근기,최창본 대구산업정보대학 1995 논문집 Vol.9 No.2
Dae Gon The study was conducted to investigate the effect of breed, sex on fatty acid compostition. Hanwoo and Holstein used, in the study were classified by sex. The results are summarized as follows ; Oleic acid and unsaturated fatty acids(UFA) percentages of total fatty acids in Hanwoo were higher than in Holstein, but palmitic acid and saturated fatty acids(SFA) were lower in Hanwoo. Oleic acid in steers of Hanwoo and Holstein tended to increase compared with bulls. Oleic acid in rib loin and top round were considerably higher in Hanwoo steers than in Holstein steers. In Hanwoosteers, oleic acid and UFA tended to increased while stearic acid and SFA decreased as marbling degree increased.
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김대곤 한국공간구조학회 2011 한국공간구조학회지 Vol.11 No.1
For the lateral load resistance of a RC frame in a medium risk seismic zone, the strength of lower story beams and columns should be larger than those of the upper stories. However, the lateral loads can be accommodated by redistributing design beam moments vertically as well as horizontally so all beams end up with identical strengths. This paper looks at the impact of the vertical redistribution of beam moments to provide identical beam strength over as many floors as possible. Two-bay six-story RC frame was designed with and without vertical beam moment redistribution and its seismic performance were evaluated by using push-over limit analysis and by non-linear time history dynamic analysis. Analytical results show that with the use of vertical beam moment redistribution the increase in the ductility demand is similar to the proportion of moment redistribution applied, but this additional demand is below the ductility capacity of well detailed RC members.
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면진장치 들림 효과를 고려한 면진된 골조의 구조 거동 평가
김대곤,Kim, Dae-Kon 한국공간구조학회 2010 한국공간구조학회지 Vol.10 No.2
After obtaining tensile and compressive stiffness as well as shear stiffness of elastomeric seismic isolator experimentally, those stiffness were modeled analytically using nonlinear computer program. To induce tensile stress due to overturning in the seismic isolators of an isolated frame for horizontal force, free vibration simulations generated by large initial displacement were conducted. Since elastomeric seismic isolator is weak for tensile stress, the axial stiffness of isolators shall be included properly in the analytical model to evaluate the uplift phenomenon of elastomeric seismic isolator.
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거세가 한우 및 홀스타인 비육우 도체의 이화학적 특성에 미치는 영향
김대곤,정근기,성삼경,최창본,김성겸,김덕영,최봉재 한국축산학회 1996 한국축산학회지 Vol.38 No.3
As an approach to producing high quality carcasses in terms of physico-chemical properties, histochemical properties, and sensory evaluations, this study was curried out to compare carcass characteristics of Hanwoo with Holsteins and that of stem with bulls reared under the same feed and feeding conditions. In Hanwoo steers, moisture content was lower while etude fat was higher than in Hanwoo bulls and Holstein steers and bulls. Water holding capacity and L value of rib loins were higher in steer than in bulls. Collagen content was higher in Hanwoo and in bulls than in steer. The degrees of hardness and chewiness in steers were significantly lower than those in bulls. The carcass of Hanwoo steer possessed higher oleic acid and unsaturated fatty acid and lower palmitic acid and saturated fatty acids than those of Holstein steers. The carcasses of Hanwoo steers yielded significantly higher oleic acid than that of Holstein steers. Hanwoo contained more I-R and II-W type of muscle fiber, than Holsteins while Holsteins contained more II-R type than Hanwoo. Steers contained more II-W type than bulls. Diameters of all types of muscle fibers were larger in Hanwoo than in Holsteins regardless of sex, and steers tended W have smaller diameters of muscle tiber than in Hanwoo bulls. Steers of Hanwoo ,how ed remarkably higher scores in sensory evaluations based on tenderness, juiciness, flavor and acceptability than hulls. The above results indicate that castration is essential to produce high quality beef.
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