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Kim, Seona,Kim, Chanseok,Lee, Jun Hee,Shin, Jeeyoung,Lim, Tak-Hyoung,Kim, Guntae Elsevier 2017 ELECTROCHIMICA ACTA Vol.225 No.-
<P><B>Abstract</B></P> <P>There is increasing demand for versatile catalysts for direct hydrocarbon utilization with the coming of hydrocarbon economy. The catalysts are required to possess both high catalytic activities and excellent carbon coking tolerance for the hydrocarbon oxidation process. In this regard, we considered Ni-based alloy catalysts, <I>e.g</I>. Ni-Co, Ni-Cu, and Ni-Fe, which are expected to provide synergistic effects from the high catalytic activities of Ni and the high carbon coking tolerance of transition metals. We conduct a systematic investigation of catalytic effects on the electrochemical properties and the carbon coking tolerance of the candidates. Moreover, the binding strengths of H, O, and C species with each alloy catalyst were examined via density functional theory (DFT) calculations, providing insight into the trend of catalytic activity and carbon coking tolerance. In this study, the single cell for the solid oxide fuel cell with Ni-Fe catalyst shows the best electrochemical performance, 0.81 and 0.30Wcm<SUP>−2</SUP> at 700°C under H<SUB>2</SUB> and C<SUB>3</SUB>H<SUB>8</SUB>, respectively, with excellent tolerance against carbon deposition.</P>
플라이오메트릭 트레이닝이 축구선수의 체력 및 유사인슐린성장인자(IGF-I)에 미치는 영향
탁형욱(Tak, Hyoung-Wook),김석훈(Kim, Seuk-Hoon),김영표(Kim, Young-Pyo) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.5
The purpose of this study was attempted to identify the effect of plyometric training on physical fitness and IGF-I in soccer players. This study divided 20 middle school soccer players into the group of general training group(n=10 ) and plyometric training group(n=10 ). Training program was carried out 3 days a week for 12 weeks. Physical fitness(leg muscular strength, muscular endurance strength, power, agility, flexibility, cardiorespiratory endurance) and IGF-I. All subjects were measured at before and after the training program participation. To verify on effects of training, we did repeated measured ANOVA. Also paired and independent t-test was performed to test the significant levels of differences within and between groups. Significance was set at the α=.05. The result of this study was as follows. Leg muscular strength and cardiorespiratory endurance were significantly increased in the general training group after training. Power and agility were significantly increased in the plyometricl training group after training, and agility were significantly higher in the plyometricl training group than the general training after the 12 weeks of training. Muscular endurance strength and flexibility were significantly increased in both groups after training. IGF-I were significantly increased in the plyometric training group after training. In conclusion, plyometric training was proved as efficient training by improving explosive power and agility, and IGF-I.