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김종인,원지연 公州大學校 스포츠科學硏究所 2005 스포츠科學硏究所論文集 Vol.17 No.-
The purpose of the research is to examine closely whether dance sport programs can influence on developing female students at a middle school girls will have great effects on their understanding of, attitudes to, and interest in the physical education class. In terms of a sampling method for the survey, sixty students at the second grade of N girls' middle school were divided into two big groups: an experimental group of thirty and a controlled group of the other thirty. For two weeks dance sport was applied to the experimental group. SPSS PC+10.0 program was used for carrying out the analysis of research data resulted from the experiment. The controlled group, however, was not provided with the program. Additionally, preliminary investigation was done to confirm whether the two groups are of the same quality group, or not. The experimental group in which dance sports applied to showed a difference as far as understanding of, attitudes to, and interest in the physical education class was concerned. That happening was t verified and X^(2)(chi-square) and a statistical level which drew our attention was P<0.05. Research and procedure application of dance sports influence on female students' understanding of, attitudes to, and interest in the physical education class based on analysis results the following conclusion was drawn. 1. The experimental group who participated in a dance sport program has had more understanding of physical education class significantly than the controlled group. 2. The experimental group who participated in a dance sport program has had better attitudes to physical education class than the controlled group. 3. The experimental group who participated in a dance sport program has showed more interest in physical education class than the controlled group.
Developing high-capacity hydrogen storage materials via quantum simulations
Jhi, Seung-Hoon,Ihm, Jisoon Cambridge University Press (Materials Research Soc 2011 MRS bulletin Vol.36 No.3
<▼1><B>Abstract</B><P/></▼1><▼2><P>Hydrogen is considered by some to be a promising non-CO2-emitting energy carrier for the future. However, to realize a hydrogen economy, there are several technological barriers to overcome. Currently, safe and efficient storage of hydrogen is a bottleneck in the practical usage of hydrogen for fuels. In this article, we present a review on the first-principles computational approach in designing hydrogen storage materials with an emphasis on molecular hydrogen storage in nanostructured materials. Given the limitation of pristine nanostructures for room-temperature hydrogen storage, the strategy of decorating the backbone structure of the nanostructure with transition metal atoms in order to enhance the hydrogen adsorption energy is addressed, and the interplay between the Coulomb interactions and the so-called Kubas interaction (nondissociative weak chemisorption via electron donation and back-donation channels) has been studied. The influence of electron spin on the hydrogen binding energy, problems of metal clustering and oxidation, and the structural instability that may arise during hydrogen sorption are also discussed. We address the limitations and challenges in the development of high-capacity hydrogen storage materials and provide perspectives for how computational materials design can help cope with those problems.</P></▼2>