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李廣純,具賢珠 가톨릭대학교 자연과학연구소 1991 자연과학논문집 Vol.12 No.-
니켈표면 Ni_(6)(100) 면에서 산소원자는 니켈 사중자리에서 가장 안정하며, 니켈원자가 네개 이상인 cluster에서 산소원자와 니켈과의 상호작용에너지는 가장 가까운 네개의 니켈원자의 영향만을 받는 것을 알았으며 이를 근거로 구한 원자가 퍼텐셜에 기인한 O_(1S)전자의 결합에너지를 계산한 결과, 니켈표면에서 산소원자는 산화상태로 존재하기보다는 이온성을 갖는 해리흡착으로 생각된다. As results of interaction energy calculated by the extended Hu¨ckel theory, the oxygen atom is stable at the four-fold state of Ni_(6)(100) surface. The interaction energy of the oxygen atom with nickel cluster is affected by only the nearest four nickel atoms On this basis, the binding energy shifts of O_(IS) electron are obtained using the valence potential. These binding energy shifts are compared with the experimental values and it is found that oxygen atoms are adsorbed as dissociated state with some ionic character on nickel surface.
이광순,김봉규 영상영어교육학회 2014 영상영어교육 (STEM journal) Vol.15 No.2
This study explores the influence of SNS (Kakao-Talk) writing practice on less proficient students’ (LPSs) participation in class and illustrates a new trial to promote pedagogical transformation from the traditional approach. In this study, 62 LPSs were participating in a teacher’s guided writing class by using specific grammar templates through Kakao-Talk, a tool of an SNS writing platform. While re-making template sentences, students were automatically reminded of the contents they had learned. They were also offered multimedia-based content including reading supplementary materials and YouTube videos uploaded on SNS, which was recompiled from students’ textbooks. The study employed a mixed method approach adopting qualitative and quantitative analyses (5-likert scale) by using SPSS 12.0. A post-survey was analyzed to calculate the students’ presence on SNS, and the efficacy through SNS–writing activity (Kakao-Talk). The correlation between scaffolded input and students’ writing strategy and the reliability coefficient of feedback factors were also reviewed. The results revealed that a number of teachers’ strategic scaffolding should be prepared to induce learners’ active engagement. While monitoring students’ writing activity through Kakao-Talk, teachers’ scaffolding ability to control the virtual-space was also considered to be as essential for LPSs as teachers’ meaningful pedagogical roles and responsibility.
李廣純,金民慶,金恩善 가톨릭대학교 자연과학연구소 1987 자연과학논문집 Vol.9 No.-
Ni₄, Ni_(6) 및 Ni_(13) Cluster의 퍼텐셜에너지를 확장된 Hu¨ckel 이론으로 계산한 결과, Ni₄ cluster의 경우 대칭성에 기인한 퍼텐셜 곡선에 변이가 있었다. 니켈의 평형 거리와 결합 에너지는 실험 결과와 잘 일치 하였다. 또 이들 cluster와 산소원자와의 상호작용 에너지를 구한 결과, 역시 에너지 곡선이 매끄럽지 않고 cluster 모형의 대칭 성질의 영향이 있었다. The potential energy of Ni₄,Ni_(6) and Ni_(13), Cluster is calculated by Extended Hu¨ckel Theory. The potential curve of Ni₄, cluster is distorted due to the symmetry of cluster model. The equillibrium distance and binding energy are good agreement with the experimentals. Also, the interaction energy of oxygen atom with these clusters are obtained. These energy curves are not smooth and effected by symmetry property.