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이용일,신현동,Lee, Yong-Il,Sin, Hyeon-Dong 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.1
The one-dimensional flame analysis was carried out to understand the combustion phenomena in porous media. The downstream as well as upstream solution corresponding to upper and lower solutions could be obtained. While upper flame temperature gets higher, lower flame temperature gets lower, as the flame approaches the central part of the combustor. The reason why upstream flame and downstream flame exist at the same flow condition is that the regions where net heat recirculation is identical exist in upstream and downstream of the combustor. In order for the downstream flame to be stabilized, more heats needed to be recirculated towards upstream because of larger radiation loss of downstream flame.
이용일,신현동,Lee, Yong-Il,Sin, Hyeon-Dong 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.1
Experiments were performed on the laminar premixed flame stabilized in a porous medium to know whether the flame downstream of the combustor exists or not. In previous theoretical studies, a stable flame has been predicted in the downstream region of the combustor, but it has never been observed in experiments. In this study, a stable downstream flame could be obtained for the lower burning velocity through circumferential heating by a blue flame positioned outside the periphery of the specially devised combustor. The existence of the stable downstream flame was confirmed by a direct photography of soot line, and temperature measurements. The effect of combustor diameter to flame stability was also considered. As the diameter of the combustor increases, the lean flammability limit was extended.
예상도 작성법 훈련이 읽기 학습장애아동의 읽기 능력에 미치는 효과
정대영,신현인 한국특수아동학회 2003 특수아동교육연구 Vol.5 No.1
본 연구는 예상도 작성법 훈련을 통하여 읽기 학습장애아동의 독해력과 읽기 인식 및 태도에 미치는 효과를 알아보기 위하여 초등학교 특수학급에 입급된 읽기 학습장애아동 5명을 선별하여 주 5회, 매회 40분 씩, 총 40회기에 걸쳐 실시하였다. 읽기 학습장애아동의 독해력과 읽기 인식 및 읽기 태도 변화 정도는 사전ㆍ사후ㆍ유지 검사에 의한 검사지의 득점으로 평가하여 변화를 알아보았고, 반복측정 분산분석법을 사용하여 예상도 작성법 훈련의 효과를 검증하였다. 이상의 예상도 작성법 훈련을 통하여 읽기 학습장애아동의 독해력과 읽기 인식 및 읽기 태도에 미치는 효과에 관한 연구를 통해 얻은 결론은 다음과 같다. 첫째, 예상도 작성법 훈련은 초등학교 읽기 학습장애아동의 독해력 향상에 효과가 있었다. 둘째, 예상도 작성법 훈련은 초등학교 읽기 학습장애아동의 읽기 인식 향상에 다소 효과가 있었다. 셋째, 예상도 작성법 훈련은 초등학교 읽기 학습장애아동의 읽기 태도 변화에 효과가 있었다. The purpose of this study was to examine the effect of prediction-mapping training on the reading comprehension, reading awareness and reading attitudes of students with reading disabilities. The subjects in this study were five selected children with reading disabilities who belonged to special class in elementary school. The prediction-mapping training was conducted in 40 sessions, five times a week, 40 minutes each. The pretest, posttest and retention test results were compared to see how much their reading comprehension, reading awareness and reading attitudes changed, and repeated measures ANOVA was utilized to determine the effect of the prediction-mapping training. The findings of this study were as below: First, the prediction-mapping training exerted a positive influence on the reading comprehension of the children with reading disabilities. Second, the prediction-mapping training had some bearings on altering the reading awareness of the children with reading disabilities. Third, the prediction-mapping training gave a positive impact on changing the reading attitudes of the children with reading disabilities. The following conclusion was extracted from the above-mentioned findings: First, the prediction-mapping training served to increase the reading comprehension of the children who had reading disabilities. Second, the prediction-mapping training had some effect on furthering the reading awareness of the students who suffered from reading disabilities. Third, the prediction-mapping training was effective for changing the reading attitudes of the students with reading disabilities.