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Calcium silicate cement-based paste의 탄산화 양생 조건에 따른 역학적 특성 및 미세구조 평가
최창근 ( Choi Chang-keun ),류동우 ( Ryu Dong-woo ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.2
This study evaluated the mechanical properties and microstructure of calcium silicate cement based paste according to carbonation curing conditions. As a result, both compressive strength and carbonation depth increased with the carbonation curing period.
강영수(Kang Young-Soo),최창근(Choi Chang-Keun) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.1
The purpose of this study was to identify the learning effect of the rocking chair skill on the fore rolling in elementary school. To achieve the purpose of this study, the 2-class of 3th grade(n=66) and the 2-class of 5th grade(n=72) of K elementary school were chosen by random sampling. And they were divided as experimental group and comparative group. The researcher reorganized the contents of the fore rolling units in the physical education texts and gave 3-hour lessons to students for the fore rolling learning. And the experimental group students learned the rocking chair skill before each lessons. The results of this study can be summarized as follows. First, after 3-hour lessons, there was no differences in average marks between the experimental group and comparative group and the two groups all showed a statistically significant improvements in the fore rolling learning. Second, in analysis of interaction effects on the factors, there was an interaction effects according to the grades and groups. Third, in t-test on the average gap between two groups, the experimental group showed a statistically significant improvements compared to the comparative group in the fore rolling. Fourth, in t-test on the average gap between two grades, the experimental group of 3th grade showed a statistically significant improvements. But in the 5th grade, there was no differences in average marks between the experimental group and comparative group.