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420J1 마르텐사이트계 스네인리스강의 오스테나이트화 조곤이 기계적 성질에 미치는 영향
김영주,주동원,박성훈,김기돈,성장현 ( Y . J . Kim,D . W . Joo,S . H . Park,G . D . Kim,J . H . Sung ) 한국열처리공학회 1994 熱處理工學會誌 Vol.7 No.1
To investigate the effect of austenitizing tempratures on the mechanical properties and corrosion resistance of 0.19%C-13.6%Cr martensitic stainless steel, the changes in martensitic trasformation temperatures, mechanical properties and anodic polarization curve were examined after changing the sustenitizing temperatures and tempering temperatures. On increasing heating rate at the same austenitizing temperatures, A_s, A_r and M_s increased. And the M_s temperature showed to be decreased with increasing austenitizing temperature. With increasing tempering temperature up to 500℃, strength, hardness and impact value were not changed remarkably, on the other hand the tensile strength and hardness decreased and impact value increased after tempering above 550℃ owing to the M_(23)C_6 carbide precipitation. The abrupt decrease in elongation at the tempering temperture of 500℃ proved to the precipitation of M_7C₃carbide. The effect of austenitizing temperature on the mechanical properties of the tempered specimen showed to be decreased in impact value and elongation at the austenitizing temperature of 1150℃. At low tempering temperatures the corrosion resistance of the tempered specimen was not changed obviously with increasing tempering temperature. On the other hand, the resistance decreased above the tempering temperature of 600℃ due to the precipitation of M_(23)C_6 carbides. The corrosion resistance showed to be improved with increasing the austenitizing temperature owing to the dissolution of carbides.
저지방 기능성 발효소시지의 제조를 위한 복합 유산균주의 이용
김영주,이홍철,박성용,박선영,오세종,진구복,Kim, Young-J.,Lee, Hong-C.,Park, Sung-Y.,Park, Sun-Y.,Oh, Se-Jong,Chin, Koo-B. 한국축산식품학회 2008 한국축산식품학회지 Vol.28 No.1
본 연구는 지방을 비교적 많이 함유하는 발효소시지의 지방을 감소시키기 위해 대두단백질을 지방대체제로 이용하여 발효소시지를 제조하였으며, starter culture로는 상업화된 유산균주인 LK30 plus 균주를 대조구로 하여 콜레스테롤 저하와 항고혈압활성 및 S. aureus에 대한 항균력을 갖는 기능성 유산균주를 복합 starter culture로 접종하여 숙성기간동안 제품의 이화학적, 조직학적, 미생물적 특성과 콜레스테롤 저하 및 항고혈압 활성과 S. aureus의 균수의 변화를 통해 항균활성을 평가하였다. 지방을 첨가하지 않는 저지방 발효소시지는 기존의 고지방 발효소시지에 비해 약 90% 이상의 지방을 감소시켰고, 숙성시간을 약 7-14일 정도 단축시킬 수 있었나, 저지방 발효소시지에서 나타나는 지나친 감량에 의한 외관의 주름 및 경도의 증가가 나타났다. 발효소시지들의 일반성분 검사 결과, 숙성시간이 경과됨에 따라 수분은 감소하는데 반해, 지방과 단백질의 함량은 상대적으로 증가하였으며, 제품의 pH는 발효기간 동안 감소되어졌다가 숙성기간동안 유지되는 경향을 보였다. 또한, 숙성 중 명도는 감소하고, 전단력과 무게감량은 증가하는 경향을 보였다. 콜레스테롤 저하와 항고혈압 활성 및 S. aureus에 대한 항균활성과 같은 기능성은 발효소시지내에서는 뚜렷한 효과를 보이지 않았다. '따라서 저지방 발효소시지에서 나타나는 과다한 주름을 방지하기 위하여 일정함량의 지방첨가와 probiotic 유산균 주가 함유하는 기능성이 발효 육제품에도 나타날 수 있도록 하는 보다 심도 있는 연구가 필요할 것으로 판단된다.
420J2 마르텐사이트계 스테인레스강의 오스테나이트화 온도가 기계적 성질에 미치는 영향
김용길,김영주,김기돈,성장현 ( Y . G . Kim,Y . J . Kim,G . D . Kim,J . H . Sung ) 한국열처리공학회 1992 熱處理工學會誌 Vol.5 No.2
For the purpose of investigating the effect of austenitizing temperatures on the mechanical properties of 0.23%C-13.6%Cr martensitic stainless steel, tensile properties, hardness, impact value and carbide extraction were examined after changing the austenitizing temperatures and tempering temperatures. The results obtained are summerized as follows. The carbide laminations formed from hot rolling before austenitization could not be eliminated after austenitizing at 950℃. With increasing austenitizing temperature, hardness increased and showed maximum value at 1050℃ and then slightly decreased. With increasing tempering temperature up to 500℃, impact value and elongation appeard to be decreased but hardness showed nearly unchanged at austenitizing temperature of 1150℃ due to the fine M_7C₃carbides precipitation. The abrupt increase in impact value, hardness and elongation above the tempering temperature of 500℃ appeared to change in carbide structure from fine M_7C₃to coarse M_(23)C_6.
김영주(Y.J. Kim),우남섭(N.S. Woo),권재기(J.K. Kwon),정소걸(S.K. Chung),박의섭(E.S. Park),김정식 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The seawater lift pump system is responsible for maintaining the open canal level to provide the suction flow of circulating water pump at the set point. The objective of this paper is to design a 2-stage mixed flow pump (for seawater lifting) by inverse design method and to evaluate the overall performance and the local flow fields of the pump by using a commercial CFD code. Rotating speed of the impeller is 1,750 rpm with the flow rate of 2,700 ㎥/h. Finite volume method with structured mesh and Realizable k-ε turbulent model is used to guaranty more accurate prediction of turbulent flow in the pump impeller. The numerical results such as static head, brake horse power and efficiency of the mixed flow pump are compared with the experimental results. The simulated results are good agreement with the experimental results less 3% error.
김영주 ( Y J Kim ) 한국축산학회 1967 한국축산학회지 Vol.9 No.1
Potassittmdichromate solutions were used for the preserving milk samples as the preservatives being -0.535℃., -535℃. (Neutralized) and -0.460℃. of freezing point, acidity and surviving bacteria in the samples were observed. All if these three different Potassiumdicromate solutions had effect to rise on acidity of samples by which even the solution was neutralized. Milk samples Creates with Solution B couldn`t be preserved over 2 days, but other two (Solution A and Solution C) which were treated with more than 4 ㎖. of level had constantly kept the freezing Point depression and acidity of milk samples through the 4 days period. The samples, however, treated with 4 ㎖. of Solution A to 100 ㎖. of samples were increased more than 0.006℃. on the freezing point depression of fresh milk while the milk samples treated with 4 ㎖. of Solution C were depressed as same as fresh milk. The samples which contained water at the rate of 0%. 1%, 3%, 5%, and 10% by weight reserved with 4 ㎖. of Solution C at the same conditions and added water were calculated by AOAC formula for the detection of water in milk. According to increase of water, milk samples were appeared highei number of freezing point then that of untreated preservative solution. However, errors of the calculated water percent in milk samples preserved with 4 ㎖. of Solution C appeared to be not greater than 1 percent from a comparison of results with the same rate of added water.
심해 환경 조건에서의 Drilling Riser System 해석
김영주(Y.J. Kim),우남섭(N.S. Woo),권재기(J.K. Kwon),윤상웅(S.W. Yoon),김병우(B.W. Kim) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
The development of deepwater oil and gas reserves constantly faces the challenge to reduce costs of all components and activities. With an increase in drilling operations in harsh environments, drilling riser requirements and limits have become more onerous due to uncertainties involved in response prediction and prolonged drilling programs. A high level of understanding is required of the response of the system to various conditions, and the design issues that govern the system. This paper presents an overview of the engineering challenges faced in designing drilling riser system for drill ship in water depths of 3,000m. Also, Static and dynamic analysis of drill riser system are carried out for the development of drill riser joint.