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- 저자 : 김대곤 (검색결과 661 건)
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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,이창배,정승부 대한용접접합학회 2002 대한용접·접합학회지 Vol.20 No.5
In the present study, the wettability and interfacial tension between (bare Cu, electroless Ni/cu, immersion Au/Ni/Cu) substrates and indium solder were investigated as a function of soldering temperature, types of flux. The wettability of In solder increased with soldering temperature and solid content of flux. The wettability of In solder was affected by the substrate metal finish used, i.e., nickel, gold and copper. On the bare Cu substrate, In solder wet better than any of the substrate metal finishes tested. Intermetallic compound formation between liquid solder and substrate reduced the interfacial energy and improved wettability. For the identification of intermetallic compounds, X-Ray Diffraction(LRD) were employed. Experimental results showed that the intermetallic compounds, such as Cu11In9 and In27Ni10 are observed f3r different substrates respectively. The wetting kinetics is investigated by measuring wetting time with the wetting balance technique. The activation energy of wetting calculated for the In solder/cu substrate and In solder/electroless Au/Ni/Cu substrate are 36.13 and 27.36 kJ/mol, respectively.
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SWAT 및 HEC-RAS모형을 활용한 유역 내 토사수지분석기법
김대곤,정태성,류권규,Kim. Dae Gon,Cheong. Tae Sung,Yu. Kwon Kyu 한국방재학회 2012 한국방재학회논문집 Vol.12 No.6
하천내에서 각종 사업을 시행하면, 그로 인해 하천에서는 토사유출, 하상 저하에 따른 인공 구조물의 기초부 손상, 댐 저수지에서의 퇴적, 해안 침식 등과 같은 토사이동에 관련된 문제가 발생하게 된다. 이러한 토사의 유출-거동을 종합적으로 파악하는 것이 토사수지분석이다. 본 연구는 유역유출 모형과 하상변동 예측 모형을 이용하여 토사수지분석을 위한 새로운 방법을 제안하였다. 낙동강 주요 지류 중 하나이며 영주댐 건설이 계획된 대표적인 충적하천유역인 내성천에 모형을 적용하고 모형의 검정과 적용성 검토를 수행하였다. 모의결과 모형은 자연하천에서의 토사유출-거동을 잘 재현하는 것으로 나타났다. 특히, 모형은 내성천에서 실측한 유사량과 유사한 계산결과를 보이는 것으로 나타났다. 내성천 유역의 토사수지 분석결과 총 1,704만톤의 토사손실이 발생한 것으로 나타났으며 이들은 대부분 하도침식에 의한 것으로 추정된다. 제안된 방법은 자연하천에서 토사수지분석이나 토사이동 관련 재해위험도저감에 활용될 수 있을 것이다. Various river projects have caused sediment transport relate problems such as sediment yields, foundation damages of river facilities by riverbed degradation, siltation on reservoir and erosion in coast. To understand comprehensively these behaviors related on sediment erosion, transport and yields from inflows to outflows in river watershed, usually, the sediment budget analysis is used. This study propose a new sediment budget analysis method using both sediment transport models of the watershed runoff model and riverbed fluctuation model. To calibrate and validate the model, the method is applied in the Naeseong-cheon which typical alluvial river is one of the main tributaries of the Nakdong river and Yeong-ju dam is planned to be built. The results show that proposed sediment budget analysis method represents well sediment transports in the natural river watershed. Specifically, sediment loads calculated by the method is fit well to the measured sediment loads in the Naeseong-cheon watershed. The sediment budget analysis results show that the soil loss of 17,040,000 tons due to erosion in many parts of river bed is estimated in the Naeseong-cheon. The suggested method can be used for sediment budget analysis and sediment related disaster risk reduction in the natural streams.
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김대곤,Kim, Dae-Gon 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.12
The control algorithm of a new type self-bearing step motor is presented. The motor actuator is used for both motor and bearing functionality without any redundant coil windings or redundant electromagnets. The self$.$bearing step motor layout and its control method are described. A linearized farce-current-displacement relationship is derived. As the result of the unbalance response approach, the constant torque production is possible fur the supply current regulation algorithm. And even if the bearing functionality is added in the motor functionality, no additional current for bearing functionality is possible, and this leads to minimize the net power loss. Also, the unbalance response shows the independent bearing force and motor torque.
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김대곤 한국지진공학회 2001 한국지진공학회논문집 Vol.5 No.4
고무제품에 근간을 둔 면진장치는 상당한 저온효과와 약간의 변형도 속도효과를 보여준다. 면진장치의 비탄성거동에 영향을 미치는 이들의 속성은 면진장치의 거동을 정확히 모델링하기 위해 반드시 고려되어져야 하기 때문에, 고무와 납 모두에 영향을 미치는 저온효과와 변형도 속도효과를 고려할 수 있는 해석모델을 제시하였다. 얼린 면진장치를 일정 수직하중에서 수평방향 반복하중을 가한 실험결과들로부터 시스템 식별(SI : system identification)을 적용하여 해석모델에 필요한 고무와 납의 매개변수들을 구하였다. 제안된 해석모델은 면진장치의 거동을 유사하게 표현할 수 있음을 보여준다. Rubber bearings may exhibit a significant cold temperature effect and some velocity dependency(strain rate effect). Both of these attributes which affect non-linear behavior must be accounted for when accurately modeling the bearings behavior, therefore, an analytical models is proposed to consider the effects of the cold temperature and strain rate on both rubber and lead. From the results of an experimental investigation where the frozen bearings were tested under lateral cyclic loading with constant axial load, a non-linear system identification with least squares procedure was applied to determine the material properties of rubber and lead. It is demonstrated that the proposed analytical model is able to simulate the reversed cyclic loading behavior of elastometric and lead-rubber bearings.
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