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최혁준,김민 한국공업화학회 2005 응용화학 Vol.9 No.1
Chelating forming groups were introduced into the polymer chains grafted onto a porous hollow-fiber membrane for Sb ion remove in waters by radiation-induced graft polymerization and subsequent functionalization of a monomer containing an epoxy group. Moreover adsorption characteristic and different pH of Sb ion by n-MG membrane were researched. The breakthrough curves overlapped independent of the permeation pressure, residence time. This indicates a negligible diffusional nass-transfer resistance of Sb ion to the chelating forming groups. Moreover the adsorption capacity of each n-MG membrane appeared the highest around pH 7.
무중력 상태에 대한 예상의 확인 결과가 예비 초등 교사의 인지갈등과 개념변화에 미치는 영향
최혁준,김준태,권재술 한국초등과학교육학회 2005 초등과학교육 Vol.24 No.1
This study examined the effects of the result of ascertaining predictions on cognitive conflict and conceptual change when students learned the concept of weightlessness. Participants were 200 pre-service elementary teachers. They answered the pretest composed of two items. Through the demonstration on either of two items of the pretest, they identified whether their predictions were correct or not. In addition, students' cognitive conflicts were measured. After brief instructional treatment, the posttest was conducted. The results of this study are as follows: The more students who identified their own predictions on the experiment were incorrect there were, the more effective it was on cognitive conflict and conceptual change. And cognitive conflicts and conceptual changes of students who identified that their predictions were incorrect were generated meaningfully more than those of students who identified that their predictions were correct. From these results, it is concluded that students who identified that their predictions were correct experience cognitive conflicts, but their cognitive conflicts and conceptual changes were smaller than those of students who identified that their predictions were incorrect.