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김신동,이영석,김주완,엄지선,조세호 한국수소및신에너지학회 2006 한국수소 및 신에너지학회논문집 Vol.17 No.1
Activated carbon fibers (ACFs) with high surface area and pore volume were modified with metal Ni impregnation and fluorination and investigated hydrogen storage properties by volumetric method. Micropore volume values of ACFs obtained from surface modification with Ni impregnation and fluorination were decreased 9 and 35 %, respectively. Hydrogen storage capacities of fluorinated ACFs were slightly changed, on the other hand, that of Ni impregnated ACF was considerably increased. It means that hydrogen was not only adsorbed on ACF surface, but also on Ni metal surface by means of dissociation. Although the microphone volume of ACF modified with fluorination was decreased, its hydrogen storage were found not to be changed compared with fresh ACF. These results indicated that the surface of ACF after fluorination modification may be strongly attracted hydrogen due to high electronegativity of fluorine. Therefore, it was proven that hydrogen storage capacity was related with micropore volume and surface property of carbon materials as well as specific surface area.
기성시가지 내 신도시 개발지역의 탄소중립도시 조성방향 연구
임희지 ( Hee Ji Lim ),손기민 ( Kee Min Sohn ),김운수 ( Woon Soo Kim ),엄지선 ( Ji Seon Um ) 서울시정개발연구원 2009 연구보고서 Vol.2009 No.14
The recent Korean government has met the strong need for "low carbon emissions, green growth" to cope with grobal climate changes, and is introducing the various policies the for carbon dioxide emissions mitigation. These carbon dioxide emission mitigation policies have mostly applied to make a newtown in greenfield because it is difficult to apply for these policies to the built-up areas. However, we should be very interested in appling to these policies for the newtown-in-town in order to reduce the plenty of carbon dioxide emissions. With this background, this study proposes ways to relieve carbon dioxide emissions when we make newtown-in-town. This study classifies the carbon dioxide emission reduction category into sectors that is green building, ecological environment system, transportation & land use pattern, renewable energy supply, water management, waste disposal, carbon dioxide emission management system, and suggests the carbon dioxide emissions mitigation techniques individually. This study proposes various revised options separately about categories that the policy framework was already made, and proposes the way to reduce the carbon dioxide emissions through the energy use characteristics analysis by building use types in aspects of land use which the policy was not ready, In addition, the study suggests to create the transit oriented newtown-in-town, and combine these newtowns to the office core by the public transport.
이주일 ( Joo Il Lee ),신상영 ( Sang Young Shin ),엄지선 ( Ji Sun Um ) 서울시정개발연구원 2008 연구보고서 Vol.2008 No.30
So far, greenfield development and redevelopment with large-scale clearance have been main tools to accommodate rapidly increasing population and demand for urban lands in Seoul. Yet, these methods leveraged by monetary gain mechanisms not only clear away moderate housing for low-income residents but also create monotonous urban landscape overwhelmed by high-rise apartment houses. The real estate development machines disregarding urban organics and areal uniqueness also destroy cultural and historic assets of community. Meanwhile, new situations require more flexible methods of urban improvements based on repair and amendment in the era of low birth rate and old age. It will be difficult to redevelop existing urban areas based on development gain leverage now and in the future due to population decrease and slow economic growth. This study proposes and introduces small-scale land readjustment as a more flexible means of community improvements. This method has advantage for re-flatting, improving public facilities such as roads and parks, and securing connectivity of road networks while preserving existing urban organics and community characteristics. Also, the method does not need to clear away existing residents, particularly low-and-moderate income residents. To begin with, this study sets up the policy agenda for improvements of existing built-up areas and need for small-scale land readjustment in Seoul by examining the characteristics and problems of current improvements methods. Then the study proposes small-scale community improvement methods using land readjustment by describing frameworks and characteristics of land readjustment techniques, presenting the images and advantages of using small-scale land readjustment, and looking over the cases of other countries. Also, the study implements simulations to examine adoptability of land readjustment. Finally, the study suggests legal arrangements and institutional support to introduce small-scale land readjustment in Seoul.