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건강 걷기 운동이 초등학교 5, 6학년 학생의 체격 · BMI 및 체력에 미치는 영향
김종원(Kim, Jong-Won),정선길(Jung, Sun-Gil),김도연(Kim, Do-Yoen) 한국산학기술학회 2012 한국산학기술학회논문지 Vol.13 No.11
건강 걷기 운동이 초등학교 5, 6학년 학생의 체격·BMI 및 체력에 미치는 영향을 알아보기 위해서 B광역시 S초등학교 5학년 남학생 57명, 여학생 39명, 6학년 남학생 59명, 여학생 45명, 총 200명을 대상으로 하였다. 걷기 집 단은 걷기 누가기록표상 거리를 기준으로 1집단(500 km 이상 보행), 2집단(200 km 이상 ~ 500 km 미만 보행), 3집 단(200 km 미만 보행)으로 나누었으며, 6개월간 운동을 실시한 후 결과를 분석하여 다음과 같은 결론을 얻었다. 체격항목인 신장, 체중, BMI에서 5, 6학년 남, 여학생 모든 1, 2, 3집단에서 운동 전·후에 긍정적 변화를 나타냈으며, 체력항목인 50 m 달리기, 윗몸일으키기, 제자리멀리뛰기, 앉아윗몸앞으로 굽히기, 1000 m 오래달리기 및 걷기에서는 1 > 2 > 3 집단 형태로 긍정적 변화가 나타났다. 운동 후 집단별 비교에서는 체격보다는 체력항목에서 1집단이 3집 단보다 긍정적 변화를 나타내었다. The purpose of this study was to compare and analyze the effects of fitness walking exercise on physique, BMI(body mass index) and physical fitness of 5th and 6th grade elementary children. The subjects for this study were 200 children(57 boys and 39 girls in the 5th grade, and 59 boys and 45 girls in the 6th grade) at S Elementary school in Busan. The students were divided into 3 groups. Group 1 walked more than 500 km. Group 2 walked less than 500 km but more than 200 km and Group 3 walked less than 200 km for 6 months. The result of exercising for 6 months affected the physique, BMI and physical fitness of the students analyzed as follows: In physique, height, weight and BMI had significantly positive increased in the 5th and 6th grade boys and girls in all groups as comparing before and after exercising. In physical fitness, there were significantly positive increased on 50 m run, sit-ups, standing long jump, sit-and-reach, 1000 m run-walk had in all groups by stages(group 1 > 2 > 3) as comparing before and after exercising. In compare groups after exercising, there were significantly positive increased in physical fitness on group 1 more than group 3. These results indicate that fitness walking exercise by long time is effective to improve physique and physical fitness in normal elementary school students. However, for fitness walking exercise of the positive effects are necessary to change of teachers and parents personal mind.
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이동욱(Dong wook Lee),조성용(Sung Yong Cho),정선길(Sun gil Jung),이해준(Hae Jun Lee),박정후(Chung Hoo Park) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
PDP는 LCD, OLED등과 같은 FPD(Flat Panel Display)들과는 차별화된 우수성을 가지고 있다. 따라서 본 논문에서는 AC-PDP에서의 MgO박막의 material property를 향상시키기 위하여 MgO pellet에 미소량의 Ca를 첨가하였으며 이에 따른 MgO박막을 통해 Ca의 첨가에 따른 효과를 분석하였다. MgO박막은 e-beam evaporation 방법을 사용하였으며 4인치 테스트 패널을 만들어서 방전개시전압, 방전유지전압, 어드레싱지터를 측정하였으며 방전효율은 Ca가 0.025%, 0.035%, 0.042%가 첨가되었을 때 각각 비교하였으며, 0.035%가 첨가되었을 때가 가장 좋은 효율을 가진다.
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Eulerian-Lagrangian 방법을 이용한 이송-확산방정식의 분석
李熙榮,裵烈鎬,鄭經泳,丁仙吉 서울시립대학교 산업기술연구소 1994 산업기술연구소논문집 Vol.2 No.-
In this study, Eulerian-Lagrangian method(ELM) for one & two dimensional advection-dispersion equation is studied. Advection-dispersion equation is decoupled into two terms of advection and dispersion The advection equation has been solved using the method of characteristics following fluid particles along tile characteristic line. The results are interpolated onto an Eulerian grid on which the dispersion equation is solved by Crank-Nicolson type finite difference method. In solving the advection equation, Lagrangian 2-order, 3-order, 4-order interpolation polynomials, and Hermite 3-order interpolation polynomials schemes are tested for 1-dimensional model, Lagrangian 2-order are used for 2-dimensional model. Among those, Lagrangian 4-order interpolation polynomials are superior to other interpolation polynomials. ELM model for governing flow of advection is thought that it is exact model.
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李熙榮,裵烈鎬,鄭經泳,丁仙吉 서울시립대학교 산업기술연구소 1994 산업기술연구소논문집 Vol.2 No.-
In this study, it aims to analysis the advection-dispersion of groundwater pollution in saturated aquifer and to develop the numerical model for the advection-dispersion equation. At the first, finite element method(Galerkin type) is used to simulation solute transport in Eulerian approach. At the second, Eulerlian-Lagrangian method is used to simulate solute transport which adopts a Lagrangian viewpoint when dealing with the advection terms and an Eulerian viewpoint when dealing with the dispersion terms in the solute transport equations. At the last, the numerical results were compared with analytical solutions. The results are as follows. First, Eulerlian-Lagrangian method is more stable than finite element method for the numerical dispersion and diffusion in two dimensional solute transport equation. Second, in finite element method the RMS errors are increased if the peclet number is greater than two, so that is unstable, when comparing with Eulerlian-Lagrangian method. Third, Especially in the case of the advection-dominated, Eulerlian-Lagrangian method is more stable than finite element method and eliminates numerical dispersion and oscillation for all cases investigated with peclet numbers ranging from 1 two 10.
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