• East Asian mathematical journal
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• 제26권4호
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• pp.509-533
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• 2010

This study will contribute to improve intimacy and interests of students in mathematics and to cultivate their abilities and attitudes to continuously learn through problem posing activities using fairy tales. An experimental study was carried out two classes of the fifth grade (total 60 of students, each group 30 os students) in G elementary school located in Daegu Metropolitan City. This experiment was performed for thirteen weeks. For this study, using two examination devices for measuring mathematical attitude and learning achievement, pre- and post-tests were carried out. As a result, it was found that two groups are identical groups. Problem posing activities with fairy tales had significant effect on mathematical attitudes of children and learning achievement of children.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제18권2호
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• pp.123-139
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• 2015

본 연구의 목적은 수학 수업에서 생산적 실패를 한 경험이 초등학생들의 수학적 문제해결력과 수학적 성향에 미치는 영향을 알아보는 것이다. 이를 위해 선행 연구를 바탕으로 생산적 실패를 경험할 수 있도록 수업 과정을 고안하였다. 연구대상으로 서울 은평구 Y초등학교 4학년 2개 학급을 선정하여 실험반은 생산적 실패를 활용한 수업을 진행하였으며, 비교반은 전통적인 강의식 수업을 진행하였다. 사전 사후 검사로 수학 개념이해 검사, 다양한 수학적 문제해결력 검사, 수학적 성향 검사를 실시하여 각각 t-검정하였으며, 학생들의 토의과정 및 활동지, 면담 등을 활용하여 수학적 문제해결력과 성향을 질적으로 분석하였다. 그 결과 생산적 실패를 경험한 학생들의 문제해결력과 수학적 성향에 유의미하게 개선되는 효과를 보였다. 이는 학생들이 실패를 통해 수학 개념을 스스로 구성하면서 보다 명확한 이해를 하는 과정에서 긍정적인 효과를 가져 온 것으로 보인다. 심층적인 추후 연구로 수학교과서 개발 및 수업 방법 개선에서 이를 활용해야 함을 제안하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 하계학술대회 논문집
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• pp.707-710
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• 2000

Optimization of the biphenyl chloromethylation process with para-formaldehyde has been investigated in the presence of ZnCl$_2$with HCI gas by the Box-Wilson method of mathematical planning of experiment. The 4,4'- (dichloromethyl)-biphenyl yield dependence on the biphenyl para-formaldehyde ratio, temperature and reaction duration has been studied. A mathematical model of the process has been developed and optimal conditions for the biphenyl chloromethylation procedure has been determined.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2004년도 SMICS 2004 International Symposium on Maritime and Communication Sciences
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• pp.77-79
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• 2004

Optimization of the biphenile chloromethylation process with paraphormaldegide has been done in the presence of ZnCl$_2$ with HCI gas by the Box-Wilson method of mathematical planning of experiment. The 4, 4'-( dichloromethyl)-biphenile yield dependence on the biphenile - paraphormaldegide ratio, temperature and reaction duration has been studied. A mathematical model of the process has been developed and optimal conditions for the biphenile chloromethylation procedure has been determined

• 동굴
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• 제73호
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• pp.1-8
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• 2006

Optimization of the biphenile chloromethylation process with paraphormaldegide has been done in the presence of $ZnCl_2$ with HCl gas by the Box-Wilson method of mathematical planning of experiment. The 4,4'-(dichloromethyl)-biphenile yield dependence on the piphenile -paraphormaldegide ratio, temperature and reaction duration has been studied. A mathematical model of the process has been developed and optimal conditions for the biphenile chloromethylation procedure has been determined.

• 펄프종이기술
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• 제34권3호
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• pp.17-24
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• 2002

An unsteady-state moisture diffusion through cellulosic fibers in paper was characterized from the moisture sorption experiment and the mathematical modeling. The sorption experiment was conducted by exposing thin dry paper specimens to a constant temperature-humidity environment. Oven dried blotting papers and filter papers were used as test samples and the gains of their weights were constantly monitored and recorded as a function of sorption time. For a mathematical approach, the moisture transport was assumed to be an one-dimensional diffusion in thickness direction through the geometrically symmetric structure of paper. The model was asymptotically simplified with a short-term approximation. It gave us a new insight into the moisture uptake phenomena as a function of square root of sorption time. The fiber-phase moisture diffusivities(FPMD) of paper samples were then determined by correlating the experimental data with the unsteady-state diffusion model obtained. Their values were found to be on the order of magnitude of $10^{-6}-10^{-7}cm^2$/min., which were equivalent to the hypothetical effective diffusion coefficients at the limit of zero porosity. The moisture sorption curve predicted from the model fairly agreed with that obtained from the experiment at some limited initial stages of the moisture uptake process. The FPMD value of paper significantly varied depending upon the current moisture content of paper. The mean FPMD was about 0.7-0.8 times as large as the short-term approximated FPMD.

• 한국수학교육학회지시리즈A:수학교육
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• 제43권2호
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• pp.115-137
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• 2004

In this paper, we verified the effect and appropriateness of the scheme to cure the math. disliking disposition which is the cause of underachievement in learning. We choose 3 middle schools as the subject of experiment for this research. Each experiment class consists of 27∼30 students(underachievers) whose final test results of 1st school year in the middle school are 30∼60 points. In this case, we also select some middle level students whose test results are more than 60 points for the normal experimental condition. For this research, we developed the suitable test materials to cure the mathematics disliking disposition of underachievers. We applied those test materials to the experiment schools during 2.5 months and we analysed the variation of disliking disposition, the variation of math. dislike students' number and the cure rate of the math. disliking disposition. From the results of this experimental study, we find that the factors of teacher and math recognition environment have only the significant difference of math. disliking disposition between experiment class and comparison class under the 5% significance level in one middle school. We understand that this results caused by teachers' careful advice and guidance in that middle school. We also find that the number of student who dislike mathematics decreased in two middle schools. Furthermore 50% of math. disliking dispositions are cured for 9 disliking factors in the lower grade group(the group of underachievers) and as a whole, we can see that 50% of cure rate for the 7 factors of math. disliking in two middle schools. So we can understand that the experiment of our research was performed successfully in two middle schools. In this research, we find out that the scheme to cure the disliking dispositions for the factors of math. disliking depends on the factors of teacher who take charge of cure. So teachers must take interest in and must have careful concern to students and their math. disliking.

• 설비공학논문집
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• 제2권2호
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• pp.105-111
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• 1990

The drying rate in freeze drying was obtained by experiment of garlic moisture contents depending on the drying time. Freeze drying experiment of garlic juice was carried out in vaccum freeze drier of laboratory scale by backface heating, and a mathematical model is also used to simulate the process of simultaneous heat and mass transfer in freeze drying to compare with experimental data.

• 대한수학교육학회지:학교수학
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• 제6권4호
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• pp.325-344
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• 2004

본 연구에서는 개념의 조직화, 사고의 창의가 가능한 마인드맵 노트활동이 수학 학습에 미치는 영향을 알아보기 위해서 마인드맵 노트활동을 적용한 수업방식과 기존의 교사주도식 수업방식에서의 수학개념구조 형성과 수학적 창의력에 대한 효과를 분석하였다. 중학교 3학년 학생을 대상으로 약 3개월 동안 31차시의 마인드맵 노트활동을 적용하여 수업을 한 후, 수학개념구조 검사지와 수학적 창의력 검사지, 그리고 면담자료로 평가한 결과는 다음과 같다. 첫째, 마인드맵을 활용한 수업방식이 기존의 교사주도식 수업방식에 비해 학습자의 개념구조형성 신장에 효과가 있는 것으로 나타났다. 둘째, 마인드맵을 활용한 수업이 기존의 교사주도식 수업에 비해 학습자의 수학적 창의력 신장에 효과가 있는 것으로 나타났고, 특히 수학적 창의력의 하위 요소 중 유창성과 응통성 신장에 효과가 있었다. 따라서 수학 개념구조 형성과 수학적 창의력 신장을 위해서 학교수업에서 마인드맵 노트활동의 도입을 제언한다.

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제32권2호
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• pp.147-174
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• 2018

본 연구에서는 STAD 협동학습 모형을 수학교과에 적용하여 학생들의 자신감 함양 및 학습동기를 유발하여 수학적 성향 및 학습태도의 향상을 도모하고자 한다. 본 연구에서의 구체적인 목적은 아래와 같다. 첫째, 학생들의 자신감 함양 및 학습동기 유발을 위하여 STAD 협동학습 모형을 구안하고 적용한다. 둘째, STAD 협동학습 모형을 적용하여 자신감 함양 및 학습동기를 유발한 수업이 수학적 성향 및 학습태도에 미치는 효과를 검증한다. 본 연구의 구체적인 목적 달성을 위한 연구문제는 아래와 같다. 첫째, 학생들의 자신감 함양 및 학습동기 유발을 위한 수학과 STAD 협동학습 모형을 설계한다. 둘째, STAD 협동학습 모형을 적용하여 자신감 함양 및 학습동기를 유발한 수업이 수학적 성향 및 학습태도에 미치는 영향을 본 연구에서 조사한다. 결론을 다음과 같이 제시 할 수 있다. STAD 협동학습 모형을 적용하여 자신감 함양 및 학습동기를 유발한 수업을 한 집단과 전통적인 교과서 위주의 설명식 수업을 한 집단을 서로 비교 분석하여 본 결과 STAD 협동학습 모형을 적용하여 자신감 함양 및 학습동기를 유발한 수업을 한 집단에서 수학적 성향과 학습태도에 유의미한 변화가 있음을 밝혔다.