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김평석,김이수,최현영,노덕선 한국스포츠리서치 2005 한국 스포츠 리서치 Vol.16 No.2
The objective of this research is a place where it examines the participation actual condition regarding the physical training specialty-an aptitude education activity of the high school students and a satisfactory degree. In the research object currently the high school south which are to Seoul - Inch'on - Kyonggi-Do. about it set at the royal tomb which points out specifically the students and u, the ticket house method the house Rag radio ticket house law (cluster random sampling) with total 405 people was ticket collected goods. In order to analyze the data of the research which it sees it uses a SPSS 11.0 for windows statistical program with the statistical technique which it uses ! and frequency analysis (frequency analysis), x²verification, and independent group t- verification (independent group t-test) it is a back. With above same research method and process it leads and it gets and the position conclusion with afterwords is same. First, participation objective the south student the motion technology advancement and health and the physical strength increase showed a high ratio, the schoolgirl in order with the friends together description below, the and hold was doing the motion technology advancement, the person who gives the place effect which selects from a physical training department south. about as the student all friend the student answer back appeared highly. physical training relation station the map the physical training teacher the other side which is visible a most high ratio it wants the coaching staff with the fact that it prefers the leader which equips a specialty map ability. Second, physical training specialty- aptitude education activity problem point, the diversification and the schoolgirl of program the map method south student of the coaching staff was investigated recognition of physical training pure with. third, physical training activity which participates with the fact that it will receive a many help in study it led and motor function and physical strength increase and health and. Function improvement and physical strength increase, against a study help the south student, the schoolgirl appeared in small quantity highly from healthy help. physical training activity which participates it led and school life it was it is joyful. satisfactory in intimate feeling and friend relationship of stress solution and the teacher and became the many help, it will appear, that even after words it will be active from the physical training relation station, the student answer back highly was investigated and even from multi problem point inside satisfactory boat song it was investigated with the high thing.
Direct Decomposition of NO over Plasma-Assisted Catalytic System Induced by Microwave Irradiation
Roh, Hyun-Seog,Park, Yong-Ki,Park, Sang-Eon 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.4
Direct decomposition of NO was carried out over plasma-assisted catalytic system (PACS) having both microwave absorbents for plasma generation and NO decomposition catalysts for the conversion of NO into N_2 and O_2; Co_3O_4 and SiC were used as microwave absorbents and Cu-ZSM-5 was used as a NO decomposition catalyst. Stable and light blue-colored plasma could be generated successfblly in atmospheric condition over 95 wt% SiC/Cu-ZSM-5 and 25 wt% Co_3O_4/Cu-ZSM-5 PACS-5 by the irradiation of continuous microwave, which showed superior NO decomposition activity. More than 98% of NO was decomposed into N_2 and O_2 without the formation of N_2O over 25 wt% Co_3O4/Cu-ZSM-5 PACSs at GHSV > 45000 h^-1 and the apparent temperature of 280℃.
Low Temperature Methane Steam Reforming for Hydrogen Production for Fuel Cells
Roh, Hyun-Seog,Jun, Ki-Won Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.1
Low temperature methane steam reforming to produce $H_2$ for fuel cells has been calculated thermodynamically considering both heat loss of the reformer and unreacted $H_2$ in fuel cell stack. According to the thermodynamic equilibrium analysis, it is possible to operate methane steam reforming at low temperatures. A scheme for the low temperature methane steam reforming to produce $H_2$ for fuel cells by burning both unconverted $CH_4$ and $H_2$ to supply the heat for steam methane reforming has been proposed. The calculated value of the heat balance temperature is strongly dependent upon the amount of unreacted $H_2$ and heat loss of the reformer. If unreacted $H_2$ increases, less methane is required because unreacted $H_2$ can be burned to supply the heat. As a consequence, it is suitable to increase the reaction temperature for getting higher $CH_4$ conversion and more $H_2$ for fuel cell stack. If heat loss increases from the reformer, it is necessary to supply more heat for the endothermic methane steam reforming reaction from burning unconverted $CH_4$, resulting in decreasing the reforming temperature. Experimentally, it has been confirmed that low temperature methane steam reforming is possible with stable activity.
Methane Reforming Reactions over Ni/Ce-ZrO₂, Ni/La-ZrO₂ and Ni/Si-ZrO₂ Catalysts
Hyun-Seog Roh,전기원,Sang-Eon Park 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.3
Methane reforming reactions such as steam reforming of methane (SRM) and oxy-reforming of methane (ORM) have been carried out over Ni/Ce-ZrO2, Ni/La-ZrO2 and Ni/Si-ZrO2 catalysts. It was found that Ni/Ce-ZrO2 exhibits the highest activity as well as stability among the catalysts tested even though they do not have significant difference in characteristic data such as BET surface area, Ni surface area, H2 uptake and so on. Thus, it was confirmed that the remarkable activities of Ni/Ce-ZrO2 in methane reforming reactions are due to the role of a Ce-ZrO2 support resulting from strong metal to support interaction and high oxygen storage capacity.
Roh, Hyun-Seog,Lee, Deuk Ki,Koo, Kee Young,Jung, Un Ho,Yoon, Wang Lai Elsevier 2010 International journal of hydrogen energy Vol.35 No.4
<P><B>Abstract</B></P><P>Heat transfer performance of the natural gas (NG) steam reforming in a reactor bed with metal monolith catalyst has been evaluated in comparison with that in the conventional packed bed with pellet catalysts. 2%Ru/Al<SUB>2</SUB>O<SUB>3</SUB> catalyst with high intrinsic activity has been wash-coated on metal monolith substrates or used as it was for the packed bed application. The prepared metal monolith catalyst has been applied for NG steam reforming to increase heat-transfer efficiency. Under the same degree of temperature gradient from the furnace wall to the catalyst bed, the heat flux obtained in the monolithic bed reactor was about twice higher than that in the packed bed reactor. Maximum heat transfer coefficient achieved in this study for the former was 0.65 kW/m<SUP>2</SUP> K, while that for the latter was 0.3 kW/m<SUP>2</SUP> K. This is mainly due to enhanced heat-transfer via metal monolith catalyst.</P>
Roh, Hyun-Seog,Jung, Youshick,Koo, Kee Young,Jung, Un Ho,Seo, Yong-Seog,Yoon, Wang Lai The Chemical Society of Japan 2009 Chemistry letters Vol.38 No.12
<P>Ni/γ-Al<SUB>2</SUB>O<SUB>3</SUB> catalysts (Ni content = 52 wt %) have been designed by a homogeneous precipitation method using urea as a precipitation agent for direct internal reforming in a molten carbonate fuel cell. Concentrations of precursor and urea have been systematically varied to develop highly active and KOH-resistant catalyst. Compared with the commercial catalyst, the developed catalyst exhibits strong stability against KOH as well as very high activity.</P>
Direct Decomposition of NO over Plasma-Assisted Catalytic System Induced by Microwave Irradiation
Hyun-Seog Roh,Yong-Ki Park,Sang-Eon Park 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.4
Direct decomposition of NO was carried out over plasma-assisted catalytic system (PACS) having both microwave absorbents for plasma generation and NO decomposition catalysts for the conversion of NO into N2 and O2; Co3O4 and SiC were used as microwave absorbents and Cu-ZSM-5 was used as a NO decomposition catalyst. Stable and light blue-colored plasma could be generated successfully in atmospheric condition over 95wt% SiC/Cu-ZSM-5 and 25wt% Co3O4/Cu-ZSM-5 PACSs by the irradiation of continuous microwave, which showed superior NO decomposition activity. More than 98% of NO was decomposed into N2 and O2 without the formation of N2O over 25wt% Co3O4/Cu-ZSM-5 PACSs at GHSV > 45,000 h-1 and the apparent temperature of 280 oC.
Partial Oxidation of Methane over Ni/SiO<sub>2</sub>
Roh, Hyun-Seog,Dong, Wen-Sheng,Jun, Ki-Won,Liu, Zhong-Wen,Park, Sang-Eon,Oh, Young-Sam Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.5
Ni catalyst (Ni: 15 wt%) supported on precalcined SiO2 has been investigated in reforming reactions of methane to synthesis gas. The catalyst exhibited fairly good activity and stability in partial oxidation of methane (POM), whereas it deactivated in steam reforming of methane (SRM). Pulse reaction results of CH4, O2, and CH4/O2 revealed that Ni/SiO2 has high capability to dissociate methane. The results also revealed that both CH4 and O2 are activated on the surface of metallic Ni, and then surface carbon species react with adsorbed oxygen to produce CO and CO2 depending on the bond strength of the oxygen species on the catalyst surface.
Carbon Dioxide Reforming of Methane over Ni/CaO/Al₂O₃
Roh, Hyun-Seog,Liu, Zhong-Wen,Potdar, H.S.,Kim, Jae-Woo,Jun, Ki-Won 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.6
Ni catalysts supported on CaO-precoated A1₂0₃ were prepared and characterized by BET, XRD and TPR techniques. The Ni/CaO/A1₂O₃ catalysts with various CaO loadings were applied to carbon dioxide refonning of CH₄. All the catalysts showed a fairly good stability but the activity of Ni/CaO/A1₂O₃ depended upon the amount of CaO. Among the catalysts tested, the Ni/CaO/A1₂O₃ catalyst with a Ca/AI ratio of 0.04 exhibited the highest activity and stability. The interaction between Ni and the support was changed with the addition of CaO and the variation of Ca/Al ratio. Based on the characterization results, the promotional effect of CaO on Ni/-Al₂O₃ resulted from (1) the interaction between Ni and CaO, (2) the stabilization of CaO on A1₂O₃; and (3) the strong basicity of CaO. It was suggested that the highly dispersed CaO species are effective to obtain active and stable Ni/CaO/Al₂O₃; catalysts in carbon dioxide reforming of methane.