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전력구내 지중케이블 강제냉각에서의 적정냉각구간에 관한 연구
이재헌,정상호,김재근,박만홍,Lee, J.H.,Chung, S.H.,Kim, J.G.,Park, M.H. 대한설비공학회 1990 설비공학 논문집 Vol.2 No.1
The forced cooling system has been widely applied to passing more electric current in the underground power transmission cable technology. In this paper, the optimum cooling span of the in-trough-indirect water cooling method within an electric tunnel was investigated. A parametric study was performed for the cable currents, the coolant flow rates, and the coolant inlet temperatures. As a result, the temperature of the inlet air has been found as the most important parameter in determination of the optimum cooling span.
절곡필터에서의 압력강하 및 유동특성에 관한 수치적 연구
이재헌,정상호,조상준,김광영,Lee, Jae-Heon,Chung, S.H.,Cho, S.J.,Kim, K.Y. 대한설비공학회 1991 설비공학 논문집 Vol.3 No.3
Pressure drop and flow characteristics through a filter medium have been investigated numerically. A basic model similar to the filter employed in a hard disk drive was established so that the inflow velocity was 0.1 m/s and the box size was $40mm{\times}50mm{\times}30mm$. The filter medium specifications were 0.38mm of thickness, $1{\mu}m$ of fiber diameter, 0.05 of packing density. And the filter medium was pleated by 10 within the filter box. Twenty-one sets of calculation were performed with different inlet velocities, pleated numbers, and packing densities from the basic model. As the result, it was found that the velocity after filter medium had maximum value at the rear of the upstream pleated line, but had minimum value at the rear of the downstream pleated line. This made the velocity distribution have sinusoidal form immediately after the filter medium. As the inlet velocity increased, the pressure drop increased linearly. But as the packing density increased the pressure drop increased quadratically.
하지 정렬 평가를 위한 체표면 토포그래피를 이용한 측정법
임지영(J. Y. Yim),임현승(H. S. Yim),박대성(D. S. Park),이재헌(J. H. Lee),이나경(N. K. Lee) 한국재활복지공학회 2016 재활복지공학회논문지 Vol.10 No.1
이 연구의 목적은 래스터입체사진술이 적용된 ABW-mapper를 사용하여 얻은 관상면 상에서의 하지정렬 측정에 대하여 측정자 내, 측정자 간, 측정-재측정 간 각각의 신뢰도와 타당도를 조사하고 평가하는 것이다. 열여덟 명의 대상자가 이 연구에 참여하였다. 일주일간격으로 두 번의 세션에 걸쳐서 두 사람의 측정자가 각각 ABW-mapper를 사용하여 기립자세에서의 S각(입체사진 각-래스터입체사진 촬영을 통해 측정한 관상면상의 하지 정렬 측정 각)을 측정하였고, 첫 번째 세션에서는 짧은 시간 간격으로 한 측정자가 같은 대상자에 대하여 두 번씩 측정하였다. Q각은 디지털카메라로 기립자세를 촬영한 사진에서 고니어미터로 측정하였다. HKA각은 컴퓨터 기반 디지털 방사선 영상사진 위에서 측정 소프트웨어를 사용하여 측정하였다. 급내상관계수(ICC)를 통해 신뢰도를 분석하였고, 피어슨 상관계수를 사용하여 타당도를 검사하였다. 그 결과, S각 측정은 매우 높은 측정자 내(ICC=0.956~0.974), 측정자 간 (ICC=0.962) 검사-재검사 간 (ICC=0.945) 신뢰도를 나타냈으며, S각과 Q각, S각과 HKA각 사이에는 강한 음의 상관관계(각각 r=0.739, -0.702)를 나타냈다. 따라서, ABW-mapper에 의한 래스터입체사진법을 통한 S각 측정은 관상면에서의 하지정렬의 측정에 대하여 Q각이나 HKA각 측정에 관련하여 예비적 또는 보완적 도구로 사용될 수 있을 것이라 생각된다. The purpose of this study was to assess the intra-rater, inter-rater and test-retest reliability and validity of frontal plane lower extremity alignment estimated from a rasterstereographic method using ABW-Mapper. Eighteen subjects participated in this study. The S angle (stereographic angle-frontal plane lower extremity alignment estimated from a rasterstereographic method) in standing was measured throughout the two sessions with one week interval by two different readers. In the first session, a reader measured S angle twice per subject with a short break in-between. The Q-angle (quadriceps angle) was measured using a standard goniometer from a photography taken through digital camera with the participant standing in the same position as in the S angle measurement. The HKA(hip-knee-ankle) angle was measured from a computer based digital radiograph with the computerized measurement software. Reliability was tested using intraclass correlation coefficients(ICC). Validity was tested using a Pearson’s correlation coefficient. Excellent intra-rater(ICC=0.956~0.974), inter-rater(ICC=0.962), test-retest reliability (ICC=0.945) were demonstrated. There were strong negative correlations between S angle and Q-angle (r=-0.739), and between S angle and HKA angle (r=-0.702). Therefore, the S angle measured using a rasterstereographic mapper may be used to as a preliminary or supplementary tool to evaluate and study LE alignment in the frontal plane in relation to HKA angle or Q-angle.