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( Soa Ram Kim ),( Gi Woong Nam ),( Ghun Sik Kim ),( Sung Pil Yoon ),( Jae Young Leem ),( Yang Soo Kim ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.7
ZnO nanorods were grown by a hydrothermal method on ZnO seed layers that had previously been prepared from solutions containing various precursor concentrations. The effects of the ZnO seed layers prepared with various precursor concentrations on the structural and defect emissions of the ZnO nanorods were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), and photoluminescence (PL) spectroscopy. The surface morphology of the ZnO seed layers changed with an increasing precursor concentration, and the diameters and densities of the ZnO nanorods depended on the morphologies of the ZnO seed layers. The ZnO seed layers prepared with various precursor concentrations affected the residual stress in the nanorods grown on the seed layers, the intensity and full widths at half maximum of the 2-theta angle in the XRD spectra for the nanorods, and the intensity and position of the defect emission peak in deep-level emission (DLE) PL spectra for the ZnO nanorods.
학령기 아동의 사교육 이용에 대한 종단적 변화 및 예측요인
김신경 ( Kim Sinkyung ),김소아 ( Kim Soa ),송요현 ( Song Yo Hyun ) 한국보건사회연구원 2016 保健社會硏究 Vol.36 No.1
본 연구는 한국복지패널 1~9차년도 가구 및 아동부가조사 자료를 사용하여 학년 증가에 따른 사교육 이용의 종단적 변화를 살펴보고 이에 영향을 미치는 예측요인을 아동, 부모, 가구의 특성으로 나누어 분석하였다. 1차년도 기준으로 초등학교 4, 5, 6학년생 758명이 이용하는 사교육 수와 그 비용이 학년이 증가하면서 어떻게 변화하는지 잠재성 장모형을 통해 분석한 결과는 다음과 같다. 첫째, 아동이 고학년이 되고 상위학교에 진학하면서 이용하는 사교육 수는 유의하게 감소하는 반면, 실질 사교육비의 증가량은 유의하게 나타나지 않았다. 변화하는 정도는 개인마다 유의하게 다른 것으로 나타났다. 둘째, 아동 특성 중 사교육 수와 비용에 영향을 미치는 변인은 출생순위, 학업 성적, 문제행동 중 주의집중문제와 비행, 공격성이었다. 셋째, 부모 특성에서는 아버지의 학력이 사교육비용의 초기값을 정적으로 예측하였으나 변화율에는 영향을 미치지 않았다. 부모의 교육참여는 고등학생 시점일 때 사교육 이용의 변화에 종단적인 영향을 미치는 것으로 나타났다. 넷째, 가구 특성으로는 아동가구원 수, 소득, 거주 지역이 모두 아동의 사교육이용 궤적에 영향을 미치는 것으로 나타났다. The purpose of this study was to identify the effects of child, parental and household characteristics on the trajectories of extra-curricular education use in Korean students using Latent Growth Modeling. A sample of 758 elementary school students and data from the Korea Welfare Panel Study (KOWEPS) 2006-2014 were used for this analysis. First, the data showed a significant decline in the number of extra-curricular education use among students over time. The change rate of the expenses in extra-curricular education was not significant. There were individual differences in trajectories of extra-curricular education use during 9 years. Second, child characteristics affecting extra-curricular education use were birth order, academic achievement, attention problem, delinquency, and aggression. Third, father`s education level was a positive predictor of the use of extra-curricular education at the initial level. Parental participation was related with the rate of change in the use of extra-curricular education. Fourth, all household characteristics (the number of siblings, income, and residential districts) have significant influences on the trajectories of extra-curricular education use.
Growth and White Light Emission of Nano-fibrous ZnO Thin Films on Porous Silicon
( Min Su Kim ),( Soa Ram Kim ),( Gi Woong Nam ),( Hyung Gil Park ),( Hyun Sik Yoon ),( Jae Young Leem ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.1
Nano-fibrous ZnO thin films were grown on porous silicon (PS) by sol-gel spin-coating method. Atomic force microscopy, X-ray diffraction, Raman, and photoluminescence were carried out to investigate the structural and optical properties of the nano-fibrous ZnO thin films. When the nano-fibrous thin films were grown on PS, their residual stress could be reduced, and the full width at half maximum (FWHM) of the ZnO (002) diffraction peak and near-band-edge emission (NBE) peak were decreased, indicating that the optical as well as the structural properties were enhanced. Furthemore, white light emission was observed from nano-fibrous ZnO thin films grown on PS.
김원중(Wonjoong Kim),김소아(Soa Kim),장우진(Woojin Jang) 한국조명·전기설비학회 2004 한국조명·전기설비학회 학술대회논문집 Vol.2004 No.5월
교실 내에 빛을 공급하는 두 가지 요소는 인공광원과 주광이다. 일단, 빛이 실내에 방사되면 각 시설물의 표면은 빛을 반사하여 제2의 광원 역할을 한다. 따라서 교실 내 조도를 높이는 확실한 방법은 광도가 높은 등기구를 설치하고 창을 정남향으로 내면 되겠지만 이것이 여의치 못할 경우에는 제2의 광원인 시설물의 표면속성을 변화시켜 조도를 높일 수도 있다. 본 논문에서는 일정한 인공광원과 주광 하에서 시설물의 속성을 변화시켜 조도에 미치는 영향을 알아보고 개선사항을 연구해 보았다.
김소아,고동아,김재용,김명준,차흥원,Soa Kim,Dong Ah Ko,Jae Yong Kim,Myoung Joon Kim,Hung Won Tchah 대한안과학회 2013 대한안과학회지 Vol.54 No.9
Purpose: To compare intraoperative parameters and postoperative results between divide-and-conquer and multiple phaco- chop technique. Methods: Two different techniques were performed by one operator on the patients with bilateral cataract. One eye was phacoemulsified by divide-and-conquer technique (D eye), and the other was performed by multiple phaco-chop technique (M eye). Changes of central corneal thickness during the operation, total phaco-time and phaco-energy were measured. Results: Total 29 patients were included. The change of central corneal thickness were 8.4 ± 11.8 μm in D eye and 11.5 ± 16.7 μm in M eye, which showed no significant difference (p = 0.350) and total phaco-time were 70.1 ± 32.9 seconds in D eye and 71.1 ± 55.0 seconds in M eye, which also showed no significant difference (p = 0.689). However, phaco-energy were 12.4 ± 8.3 power × s in D eye and 8.4 ± 9.9 power × s in M eye, and this result showed significantly larger energy when using divide-and-conquer technique (p < 0.001). Conclusions: There was no significant difference in change of central corneal thickness and phaco-time between two techniques, divide-and-conquer and multiple phaco-chop technique. However, significantly smaller phaco energy was used by multiple phaco-chop technique compared with divide-and-conquer technique.