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비포장도로 다목적 운반차량(UTV)의 엔진룸 열 유동 해석
이선욱(Seonwook Lee),윤정의(Jeong-Eui Yun),한명훈(Myunghoon Han),탁양호(Yangho Tak),김창욱(Changwook Kim) 한국자동차공학회 2021 한국 자동차공학회논문집 Vol.29 No.11
In this study, an engine room thermal flow analysis of the UTV(Utility Terrain Vehicle), which mainly operated on unpaved roads, was performed. The purpose of this study was to investigate the heat load transmitted to the driver through the passenger seat as a result of the heat generated from the engine. Analysis conditions included the air inhaled into the engine room set in three cases, 50℃, 70℃, and 90℃, as harsh environments during a hot summer were considered. Moreover, the inflow speed of the inhaled air was determined in three cases, 50 km/h, 60 km/h, and 70 km/h, depending on the performance of the vehicle. Under these conditions, the heated air at the upper part of the engine compartment did not cool well because the air inlet area was located below the center of the engine room.
김창욱,윤성렬,한승희,나재훈,이창재 광운대학교 신기술연구소 1998 신기술연구소논문집 Vol.27 No.-
합금박막형 자기기록매체의 제작방법은 스퍼터링과 무전해 도금방법이 주로 이용되고 있으며, 미국이나 일본등에서는 스퍼터링 방법에 비하여 대량생산이 용이하고. 도금조건에 따라 다양한 특성의 합금박막을 제조할 수있는 무전해 도금방법을 이용한 합금자성박막에 대하여 많은 연구를 하고 있지만 국내에서는 이에 관한 연구가매우 미약한 실정이다. 따라서 이 연구에서는 차아인산이수소나트륨을 환원제로 사용한 무전해 도금법을 이용하여 corning glass 2948 유리기판 위에 Co-W-P 도금충을 제조할 때, pH 및 온도에 따른 석출속도, 합금조성 및 미세구조와 자기적 특성을 고찰하였다 무전해 Co-W-P 도금충의 경우는 자기적 특성에서 보자력은 5000e, 각형비는 0.6 정도의 경향을 보였지만, 결정배향에 있어서는 α-Co (0002) 방향으로 우선 배향하여 수직자화벡터를 형성함을 확인할 수 있었으며, 합금조성에 있어 인(P)의 함량은 0.8±0.2%로 일정하였고, W의 석출량은 Na_2W0_4의 농도가 증가할수록 증가하여 0.1mol/L일 때 20%이였다 수소가스를 이용한 환원분위기에서100℃간격으로 1시간씩 400℃까지 열처리에 따른 자기적 특성과 미세구조의 변화를 확인하여 본 결과Co-W-P 는 열처리에 따라 표면의 평활도는 향상되었지만, 자기적 특성과 미세구조에는 아무런 변화가 없었다. Usually sputtering and electroless plating methods were used for manufacturing metal-alloy thin film magnetic memory devices. Since electroless plating method has many merits in mass production and product variety compared to sputtering method, many researches about electroless plating have been Performed in the United State of America and Japan. However, electroless plating method has not much been studied in Korea. In these respects the purpose of this research is manufacturing Co-W-P alloy thin film on the corning glass 2948 by electroless plating method using sodium hypophosphite as a reductant, and analyzing deposition rate. alloy composition. microstructure, and magnetic characteristics at various pH's and temperatures. For Co-W-P alloy thin film. coercive force was 5000e and squareness was 0.6. For crystal orientation, (0002) orientation of α-Co was dominatly found. Then we could confirm the formation of perpendicular magnetization. The content of P was constant at 0.8±0.2% and the content of W increased as the concentration of Na_2W0_4 increased. When the concentration ofNa_2W0_4 was 0.1 mol/L. the composition of W was 20%. We observed the changes of magnetic characteristics and microstructure of thin film depositions of Co-W-P by the heat treatment. For heat treatment, the temperature was increased step by step to l00℃, 200℃. 300℃, and 400℃.and it took 1 hour at each step in the reductive condition of hydrogen gas. By the heat treatment. flatness of surface was improved, but there were no changes on the magnetic characteristics and the microstructures.