• Computers and Concrete
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• 제5권5호
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• pp.503-508
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• 2008

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 추계학술대회 논문집 Vol.21
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• pp.109-110
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• 2008

We have performed a density functional theory study to investigate the reaction of the $HfCl_4$ molecule on $H_2O$ terminated Si (001)-$(2\times1)$ surface. The reaction of the $HfCl_4$ molecule is more favorable on OH-terminated site than H-terminated site. The first $HfCl_4$ molecule is adsorbed on a OH-terminated site with 0.21 eV energy benefit. The second $HfCl_4$ molecule is adsorbed on the most adjacent OH-terminated site of the first molecule and the energy benefit is 0.28 eV. The third and forth molecules have same tendency with the first and second ones. The adsorption energies of the fifth and sixth $HfCl_4$ molecules are 0.01 eV, -0.06 eV respectively. Therefore, we find that the saturation Hf coverage is approximately 5/8 of the available hydroxyl site, which is $2.08\times10^{14}/cm^2$. Our model is well matched with an experimental study by reference.

• 정보교육학회논문지
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• 제4권1호
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• pp.57-71
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• 2000

일반적으로 웹기반 수업이 전 교과에 걸쳐 전개되고 있는 바, 다양한 WBI 자료를 교과특질에 맞게 특성화하는 일 또한 간과해서는 안 되는 중요한 수업현장의 과제이다. 따라서 웹기반 지역화 학습자료 개발이라는 당면과제를 사회과에서 해결하고자 하는 시도로써 본 연구를 추진하게 되었다. 전국 각 지역마다 '사회탐구'라는 별책교재를 개발하여 Text위주의 지역화 학습을 지도하고 있는데 이를 개선하는 노력으로 WBI 지역화 자료개발 모델을 제시하였다. 이를 바탕으로 우리고장의 생활모습 등의 다양한 내용을 WBI 자료화하여 학교 홈페이지에 올려 활용 지도하였다. 그 결과 Text위주의 교재감각에서 벗어나 역동적인 멀티미디어 환경인 지역화 웹페이지를 만남으로서 학생들의 자기 주도적 학습 능력 및 문제해결 능력이 신장되었다.

• 부모자녀건강학회지
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• 제8권1호
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• pp.49-63
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• 2005

Purpose: The present study is a descriptive research on the content of sex education conducted at home by the mothers of young children who are attending five kindergartens located in Busan, Korea. This study aims to provide basic materials for systematic sex education at home and in the school. Method: Based on the literature review and prior researches, the writer made a questionnaire consisting of 30 items regarding necessities, contents and difficulties of sex education. The 307 questionnaires were collected out of 480 which were distributed by the kindergarten teachers. Data was analysed with frequency and percentage using the SPSS Win 10.0 Program. The main subjects of the study were mothers in their thirties, who understood the necessity of sex education. However, they were lack of enough sexual knowledge in accordance with the transforming sexual culture and lack of suitable materials. They did not plan to educate their children according to their developmental stages, but just taught them verbally rather than using common materials for the situation. Result Regarding the origin of life that children often asks, mothers did not give a scientific and correct response to satisfy their curiosity about sex, saying that a baby was created after marrying a loved one. While more mothers than the prior research responded correctly to the queries of the path of delivery, some mothers did not. It may cause some children to suppress the questions, which may result a distorted sexual knowledge. That is because mothers understood that sex education was to deliver sexual knowledge, but not realized that sex education was a human education carried out throughout life. Mothers fell short of sexual knowledge, capability, and confidence, comparing with swift social changes and children's capacity. As a result, it is necessary to inspire sexual awareness into mothers and educate them through training. It is also needed to secure a training program similar to a teacher training program. Conclusion: It is essential to develop and to provide evaluation tools as well as proper materials in accordance with the children's developmental stage, so that organic management system among home, education institute and society must lead sex education Further, it is necessary to provide teaching methods and materials to mothers regularly, so that the school and home may conduct sex education together to cope with difficulties.

• Bulletin of the Korean Chemical Society
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• 제32권2호
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• pp.559-565
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• 2011

The following noble series of statistical copolymers, poly[(2-(3-thienyl)ethanol n-butoxycarbonylmethylurethane)-co-3-hexylthiophene] (PURET-co-P3HT), were synthesized by the chemical dehydrogenation method using anhydrous $FeCl_3$. The structure and electro-optical properties of these copolymers were characterized using $^1H$-NMR, UV-visible spectroscopy, elemental analysis, GPC, DSC, TGA, photoluminescence (PL), and cyclic voltammetry (CV). The statistical copolymers, PURET-co-P3HT (1:0, 2:1, 1:1, 1:2, 1:3), were soluble in common organic solvents and easily spin coated onto indium-tin oxide (ITO) coated glass substrates. Hybrid bulk heterojunction photovoltaic cells with an ITO/G-PEDOT/PURET-co-P3HT:PCBM:Ag nanowires/$TiO_x$/Al configuration were fabricated, and the photovoltaic cells using PURET-co-P3HT (1:2) showed the best photovoltaic performance compared with those using PURET-co-P3HT (1:0, 2:1, 1:1, 1:3). The optimal hybrid bulk heterojunction photovoltaic cell exhibits a power conversion efficiency (PCE) of 1.58% ($V_{oc}$ = 0.82 V, $J_{sc}$ = 5.58, FF = 0.35) with PURET-co-P3HT (1:2) measured by using an AM 1.5 G irradiation (100 mW/$cm^2$) on an Oriel Xenon solar simulator (Oriel 300 W).

• 한국학교수학회논문집
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• 제17권4호
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• pp.629-656
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• 2014

이 연구는 수학과 과학, 특히 생명과학과의 연결성에 기초하여 미적분과 통계 기본 교과의 확률의 뜻과 활용 단원을 생명과학I의 유전 내용과 통합하여 지도하는 교수-학습 자료를 개발하고 개발된 교수-학습 자료를 실제 수업에 적용하여 수업에 참여한 고등학생들이 드러내는 특징을 분석함으로써 그 교수학적 시사점을 기술하는데 목적을 두었다. 선행연구 분석을 통해 통합 교수-학습 자료 개발을 위한 세부 관점을 상세화하고 생명과학 교과서와 수학 교과서를 분석하여 연계 가능한 내용을 추출한 다음 이를 실제 교수-학습 자료로 조직하였다. 이를 활용한 수업에서 학생들이 보이는 특징을 4가지로 요약하여 제시함으로써 수학과 과학 통합교육의 설계와 실행에 있어 몇 가지 시사점을 제안하였다.

• 한국재료학회지
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• 제20권2호
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• pp.55-59
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• 2010

$Na^+$ ion conductivity can be improved by the substitution of an Mg atom for an Al atom to form a nonstoichiometric $Na^+$ $\beta$-alumina. We performed a first principles study to investigate the most stable substitution site of an Mg atom and the resulting structural change of the nonstoichiometric $Na^+$ $\beta$-alumina. Al atoms were classified as four different layers in the spinel block that are separated by conduction planes in the nonstoichiometric $Na^+$ $\beta$-alumina. The substitution of an Mg atom for an Al atom at a tetragonal site was more favorable than that at an octahedral site. The substitution in the spinel block was more favorable than that close to the conduction plane. This result was well explained by the volume changes of the polyhedrons, by the standard deviation of the Mg-O distance, and by the comparison with bulk MgO structure. Our result indicates that the most preferable site for the Mg atom was the tetrahedral site at the spinel block in the nonstoichiometric $Na^+$ $\beta$-alumina.

• Bulletin of the Korean Chemical Society
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• 제34권2호
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• pp.489-494
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• 2013

An improved method for the preparation of monomethine cyanine dyes with quinoline nucleus by one-pot three-component using 1-methyl-2-quinolinethione, quaternized 2- or 4-methylheterocyclic compounds and methyl p-toluenesulfonate as starting materials was described. Compared with the traditional methods, the new synthetic method reduced the reaction steps, shortened the reaction time, avoided the separation and purification of the intermediate and reduced cost. The dyes absorbed in the region 478.0-563.0 nm and had molar extinction coefficients of $1.3{\times}10^4-9.4 {\times}10^4L\;mol^{-1}\;cm^{-1}$. Their fluorescence maxima and Stokes shifts were in the range of 525.2-594.4 nm and 16.2-80.6 nm in different solvents, respectively. From the spectral properties of the dyes in different solvents, it could be found that the ${\lambda}_{max}$ of the dyes were shorter in protonic solvents, and showed hypsochromic shifts with the increase of polarity of the solvents.

• 대한지역사회영양학회지
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• 제25권6호
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• pp.451-463
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• 2020

Objectives: The purpose of this study was to develop and evaluate booklets and video clips to prevent children from picky eating. Methods: Based on a survey conducted on food preferences of preschool children aged 2 to 5 years, 14 kinds of less preferred vegetables were selected. Accordingly, educational videos, activity books, and teaching-learning guides were produced for preschool children using the 'food bridge' theory, and the educational materials were named "Friendly vegetables". Educational materials were distributed to childcare institutions, and their effectiveness was investigated for preschool children who were instructed on these materials once every 30 days from March to November, 2019. The children were examined for changes in their knowledge of names, colors, taste/texture, methods of cultivation, and preferences for vegetables before and after the instructional course. Results: The awareness of vegetables increased significantly in younger children and the picky eating group. When the assessment was carried out in terms of vegetable knowledge, it was observed that the younger the age or the pickier the in eating food, the more effective the education is compared to the counter part. The preference for vegetables also increased after the instruction compared to the pre-instruction period, but significant changes were seen only in the 2~3 year age group for boys and girls. Also, only the picky group of girls showed changes in preference. The children's average interest in the education materials was 3.85 points out of 5 points. Conclusions: Through this study, we have developed educational materials for standalone use in childcare facilities and confirmed that they have a significant effect on improving awareness and preferences related to vegetables. In summary, the younger the age or the pickier the child in eating food, the more effective the education. It is believed that additional education on mealtime guidance is needed which can alter the eating behavior of preschool children and improve their diet. It is proposed to widen the scope of use of the materials by collecting diverse opinions from child care teachers.

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제34권4호
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• pp.563-585
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• 2020

본 연구는 교육용 프로그래밍으로 활용할 수 있는 파이썬을 활용한 수학과 코딩의 융합 수업 교수·학습 자료를 개발하기 위해 중학교 1학년 소인수분해 단원을 중심으로 수업지도안과 학생 활동지를 개발하는데 목표를 두고 있다. 본 연구에서는 파이선 프로그램을 사용해 본 경험이 없는 중학교 학생들에게 적용하여 수학과 코딩의 융합 수업 방법 및 내용의 적절성을 확인하고자 하였다. 이러한 과정에서 중학교 1학년 2명의 학생들에게 적용한 결과의 분석을 통해 교수·학습 자료를 수정·보완 하여 최종 자료를 개발하였다. 본 연구에서 개발한 교수·학습 자료는 코딩을 활용하여 소인수분해를 학습하는 융합수업이 이루어질 수 있도록 수업 방법 및 수업 내용을 구성하였으며 이를 통해 수학과 코딩에 대한 융합 수업이 현장에서 시도될 수 있는 가능성을 보여주었다.