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一部 島嶼地域의 學童(初ㆍ中)을 中心으로한 皮下脂肪厚測定에 依한 總脂肪量 測定에 關한 硏究
李圭漢 中央醫學社 1972 中央醫學 Vol.22 No.4
For the measurement on the fat content in primary and middle school students was conducted on a total of 810 students (male 458, female 352), from 6 to 15 years of age. The subjects were all students in the Young Yoo Island, Young Yoo Myun, Bu Chun Kun, Gyunggi-Do total body fat amount was measurement by skin fold thickness with a skin-fold caliper (manufactured by Cambridge Scientific Industrial Inc. U.S.A) at four sites of the body, and it was calculated by Keys and Brozek'sl2), Nam's36), and Kim's26)37) regression equation. As a result of this survey, the following conclusions were obtained. 1. At the same age skin-fold thickness on all sites were greater in girls than boys. 2. The mean value of skin-fold thickness: The average value of the whole body's as well as from four parks (scapular, abdominal, lumbar, upper arm) of the body are much lower than the students in urban but similar to those of students from rural area. 3. By the regression equation of the body fat weight: The students nutritional condions are as follows: Fat weight (kg), fat free weight (kg), fat weight/total body mass (%), fat free weight/tota 1 body mass (%), fat weight/Fat free weight (%), as well as on the whole of the student's nutritional condions are much lower than the student's in urban.
코리올리힘 이 作용하는 亂流境界層內 의 流動 에 관한 硏究
이규한 대한기계학회 1985 대한기계학회논문집 Vol.9 No.2
본 연구에서는 단순유로인 단면이 장방형인 각통을 그것에 수직한 축둘레에 회전시켜서 유로의 압력측 및 부압측에서의 속도 및 변동속도성분의 거동을 실험적으 로 조사함으로서 코리올리힘이 난류경계층 내의 유동에 미치는 영향을 구명하였다. The effect of the Coriolis force on the 2-D turbulent boundary layer which is developed in the side wall of the rotating rectangular flow channel was investigated. In this study, we measured mean velocities, turbulent velocity components(axial as well as lateral ones) and Reynolds stresses of the turbulent boundary layer. For high Reynolds number flows, the turbulent boundary layer without pressure gradient is hardly affected by the rotation. For low Reynolds number flows, however, the shearing stress at suction side decreases. Consequently, the velocity near the wall become slower so that the thickness of the viscous sublayer expands. On the other hand, the velocity near the wall at pressure side turns out increased.
이규한 대한기계학회 1986 대한기계학회논문집 Vol.10 No.5
본 연구에서는 난해한 수식을 구사한 새로운 제어회로에 관한 해석이나 설계 이론에 관한 것이 아니라 지금먼저 비금속 윅을 단독으로만 실험하여 해석해와의 일치 까지의 여러 연구자의 의론에 의하여 확립된 열선유속계의 기본계측이론을 충실하게 실현하는 단순화회로로 구조가 간단하고 취급이 간편하며 저렴한 가력으로 제작 할 수 있으며 성능면에서도 고가의 기성 상품에 비하여 그다지 손색이 없는 실용적인 정온도 형 열선유속계를 개발하는 것이다. Hot-wire anemometer with constant temperature hot-wire anemometer bridge, linearizer, D.C. stabilization electric power source and square-wave generater has been constructed for trial and the test has been carried out. As a result the test showed the overall frequency response of 6KHz over the change of air flow and the noise of approximately 1cm/s in an air flow of 10m/s. The accuracy of the lienarizer stands comparison with the existing anemometer and turned out to be relatively good operational characteristics.