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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>
Smart Meter와 부하 패턴 분류를 이용한 Critical Peak Pricing 요금제 적용
주지영(Jhi-Young Joo),권상혁(Sang Hyeok Kwon),안상호(Sang-Ho Ahn),윤용태(Yong Tae Yoon) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.11
일반 수용가를 대상으로 한 효율적인 수요관리의 한 방법으로써 Dynamically-Administered Critical Peak Pricing[1] 요금제를 이용하여 일반 수용가 대상 수요관리를 스마트 미터기인 Smart Cabinet Panel(SCP)를 개발하여 적용하였다. 이 DA-CPP 요금제에는 핵심이 되는 최적 critical peak 시점을 푸는 하위 문제들 및 방법론들이 존재하는데, 우리는 energy service provider(ESP)가 관리해야 할 수용가의 수가 매우 많다는 점에 주목하여, 각 수용가의 1일 부하 사용량 패턴을 몇 개의 그룹으로 나누어 각 그룹에 대해 critical peak 최적 시정을 결정하는 연구를 수행하였다. 이러한 수용가 부하량 패턴 그룹화를 위해 인공 지능의 여러 기법 중 하나인 self-organizing map(SOM)을 사용하였다. 그리고 ESP와 수용가가 통신할 수 있도록 개발된 SCP를 통해 Critical Peak을 적용하였다.