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卞烘圭,閔丙德 全北大學校 敎育大學院 1997 敎育論叢 Vol.17 No.-
This study is aimed at examining the effects of the dynamic assessment on the mathematics attitude and achievement. Forty senior high school students were assigned to the two conditions of experiment: dynamic assessment (N=20) and traditional evaluation (N=20). The experiment was conducted by dynamic assessment such as writing essays, conducting experiments, providing written answers to problems or preparing portfolios. The results obtained from this experiment were as follows: First, the dynamic assessment showed a higher positive attitude on mathematics learning than the traditional evaluation. Second, the dynamic assessment showed a critically higher achievement on mathematics learning. A conclusion derived here is that the dynamic assessment is definitely a strong factor to bring higher cognitive skills, and thus an integrated instruction and assessment in mathematics must be encouraged.
Byeong-Deok Hong,Kyo-seok Lee,Dong-Sung Lee,Ja-Hyun Rhie,Hui-Su Bae,IL-Hwan Seo,Seung-Geun Song,Doug-Young Chung 한국토양비료학회 2016 한국토양비료학회지 Vol.49 No.5
In this experiment we investigated the influence of various anions including oxalic acid encountered as solution phase in soil on the adsorption and desorption of sulfate in Chungwon Bt soil. The effect of chloride and nitrate on the adsorption of sulfate was not significant, suggesting that sulfate was better able to compete for adsorption sites at concentrations studied, in contrast to the large reduction in the amount of chloride adsorbed in the presence of sulfate. The results of competition for sorption sites between sulfate and anion showed that the simultaneous presence of two anions in solution was effective in reduction of competing anion at a maximum value of adsorption, due to the similar adsorption mechanism for anion competition. Therefore, the variation in the buffer power of the acids will produce a change in the strength and amount of adsorption and the competitive ability.