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1P-167 Synthesis of core-shell by sol-gel processing to control the release rate of core
정대걸,차재민,류봉기 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
It was well known that core loss and overuse can be reduced by the control of shell thickness and composition in the core-shell structure. In this study, glass coated Fe core-shell with controlled xSiO<sub>2</sub>-(100-x)P<sub>2</sub>O<sub>5</sub> (x=100, 90, 80 and 70) glass shell thicknesses were prepared by sol-gel method, and the change of the elution amount of core shell thicknesses were prepared by sol-gel method, and the change of the elution amount of core was observed. The core-shell was characterized by X-ray diffraction(XRD), Fourier transform infrared absorption spectra(FTIR), and Transmition electron microscopy(TEM). In addition, pH meter and ICP-MS equipment were used to measure the amount of elution with pH change. When the amount of P<sub>2</sub>O<sub>5</sub> increased in the glass system, the elution amount of core increased because of poor chemical durability of the shell, therefore we confirmed the core operating time was controlled by the shell composition and thickness.
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도예활동이 정신지체학생의 학습태도 및 주의집중시간에 미치는 영향
정대걸 한국임상치유예술학회 2014 임상예술치료연구 Vol.3 No.-
본 연구는 도예활동이 정신지체아 학생의 학습태도와 주의집중에 미치는 영향을 살펴보기 위하여 정신지체학생을 위한 전북 H학교 고등부 학생 5명을 대상으로 도예활동 프로그램을 매주 월요일, 수요일, 금요일 3회씩 총 30회기에 걸쳐 시행하였으며 매 회기 평균 소요시간은 1시간이었다. 이상의 연구 결과를 통해 얻어낸 결론은 다음과 같다. 첫째, 도예활동은 정신지체아 학생의 학습태도 향상에 긍정적인 영향을 미쳤다. 둘째, 도예활동은 정신지체아 학생의 주의집중시간 향상에 긍정적인 영향을 미쳤다. 본 연구는 다음과 같은 제한점이 있다. 첫째, 본 연구는 사례연구이기 때문에 결과의 일반화가 어렵다. 둘째, 실험에 사용된 도예 프로그램의 선택에 따른 차이가 결과에 영향을 미칠 수도 있다. The purpose of this study was to examine the influence of ceramic art activity on the learning set and attention of mentally retarded students. The subjects were five selected high school students from H school for youth with mental retardation in north Jeolla province. The ceramic art program was conducted in 30 sessions, three times a week, on Mondays, Wednesdays and Fridays. Each session run one hour. The findings of this study were as follows: First, the ceramic art activity had a positive impact on boosting the learning set of the mentally retarded students. Second, the ceramic art activity exercised a positive influence on increasing the attention span of the mentally retarded students. There were some restrictions in this study: First, the findings of the study might not be generalizable, as it's a case study. Second, experimental results might depend on the type of selected ceramic art program.
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인지행동치료에 기반한 집단미술치료가 경도지적장애 청소년의 적응행동에 미치는 영향
정대걸,이상열 한국예술심리치료학회 2015 예술심리치료연구 Vol.11 No.4
본 연구의 목적은 인지행동치료에 기반한 집단미술치료가 경도지적장애 청소년의 적응행동에 미치는 영향을 알아보기 위함이었다. 그래서 특수학교에 재학 중인 지적장애 중, 고등학생 95명의 학생 중에서 경도지적장애 20명을 무선 표집해서 실험집단과 통제집단으로 각각 10명씩 무선 할당하였다. 실험집단에게 인지행동치료에 기반한 집단미술치료 프로그램을 주 1회 60분씩 18회 시행하였으며 통제집단은 무처치 하였다. 적응행동을 알아보기 위한 평가로 한국형적응행동검사(K-ABS검사)를 실시하였고, 사전검사와 사후검사를 시행하여 비교하였다. K-ABS검사는 담임교사를 통하여 객관적으로 실시되었다. 그리고, 인지행동치료에 기반한 집단미술치료 프로그램을 실시한 실험집단과 통제집단 간의 동질성을 알아보기 위해 독립 표본 t검증을 실시하였으며, 검증 결과에 따라 반복측정 이원변량분석과 공변량분석(ANCOVA)을 실시하였다. 그 결과 인지행동치료를 기반으로 한 집단미술치료 프로그램은 경도지적장애 청소년의 적응행동을 향상시켰다. 이는 인지행동치료를 기반으로 한 집단미술치료 프로그램이 적응행동을 증진시키는 재활 프로그램의 한 방안으로 유용하게 적용될 수 있음을 시사한다. The objective of this study was to find out the effects of cognitive behavior therapy based group art therapy on adaptation behavior of adolescents with mild intellectual disability. For this study, 20 students with mild intellectual disability out of 95 middle and high school students with intellectual disability of special school were randomly sampled, and were equally and randomly divided to the experimental group (10 students) and the control group (10 students). The experimental group was subjected to cognitive behavior therapy-based integrative art therapy programs of 60 minutes, once a week and up to 18 sessions. The control group was not. Evaluation was conducted by the Korean adaptive behavior Scale (K-ABS Scale) to investigate the adaptive behavior, compared to conduct pre-tests and post-tests. K-ABS Scale was also conducted objectively through homeroom teachers. And to explore the homogeneity between the experimental group and the control group to cognitive behavior based group art therapy, independent sample t-test was conducted. And it was conducted to repeated ANOVA and ANCOVA as a test result. The result in this study are as follow. Cognitive behavior therapy based group art therapy did have a significant effect on the adaptation behavior of adolescents with mild intellectual disability. These results suggest that this program could be useful rehabilitation program for adolescents with mild intellectual disability.
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Study on the Water Durability of Molybdate Glasses with B2O3 as Low Temperature Sealing Materials
신재영,차재민,김대성,정대걸,배준현,류봉기 대한금속·재료학회 2017 대한금속·재료학회지 Vol.55 No.12
The boron alkali molybdate glass system was investigated as lead-free low-temperature melting sealing materials, with different boron oxide contents between 0 and 8 mol%. The glasses were characterized using X-ray diffraction (XRD), differential scanning calorimetry (DSC), infrared spectroscopy (IR), and by densities. Their chemical properties were measured by their dissolution rates (DR) and by Product Consistency Test (PCT). As the boron oxide contents were increased, the glasses maintained their low temperature properties (Tg under 175 ℃) and new network formers of [BO3] triangular units and [BO4] tetrahedral units appeared. The results confirmed that boron oxide doped molybdate glass is a candidate low-temperature sealing material. The introduction of small amounts of B2O3 causes a change in the amorphous network’s main structural units from molybdate units to a mixture of molybdate and borate units. The glasses possess MoO4, MoO6, BO3 and BO4 groups as basic structural units. In this study, the amount of MoO3 was much higher than that of B2O3, so the boroxol ring structure occurred much less frequently than molybdates as a network former. But addition of B2O3 leads to an increase in the number of bridging oxygens and strengthens the glass network. As a result, the overall glass system becomes more rigid, and chemical durability is improved.
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