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카본우븐패브릭 기반 2D 구조의 Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> 배터리음극소재
남상희 ( Sanghee Nam ),시마엄라오 ( Sima Umrao ),오세웅 ( Saewoong Oh ),오일권 ( Il-kwon Oh ) 한국복합재료학회 2019 Composites research Vol.32 No.5
2D 전이금속 탄화물(MXenes) 가운데, 타이타늄 기반의 Ti<sub>3</sub>C<sub>2</sub>는 뛰어난 전기전도성과 전기화학적 특성 및 표면작용기의 영향으로 이차 전지와 슈퍼캐패시터와 같은 에너지저장장치의 유망한 전극 물질로 각광받고 있다. 전극으로서 Ti<sub>3</sub>C<sub>2</sub>의 사용은 이온이 반응할 수 있는 표면적을 넓혀줄 뿐만 아니라, 이온의 확산 거리를 줄여주고, 전하의 운동을 향상시켜준다. 이 연구에서, 효율적으로 MAX phase로부터 Ti<sub>3</sub>C<sub>2</sub>를 합성하는 방법을 통해 리튬이온배터리에서 MXene기반의 전극 물질을 위한 새로운 방향을 제시하고자 한다. Two dimensional transition metal carbides and/or nitrides, known as MXenes, are a promising electrode material in energy storage due to their excellent electrical conductivity, outstanding electrochemical performance, and abundant functional groups on the surface. Use of Ti<sub>3</sub>C<sub>2</sub> as electrode material has significantly enhanced electrochemical performance by providing more chemically active interfaces, short ion-diffusion lengths, and improved charge transport kinetics. Here, we reports the efficient method to synthesize Ti<sub>3</sub>C<sub>2</sub> from MAX phase, and opens new avenues for developing MXene based electrode materials for Lithium-Ion batteries.
A study on the information architecture of fashion DB
Sanghee Lee,Seunghwan Oh 한국디자인지식학회 2007 한국디자인지식학회 Conference Vol.2007 No.8
A lot of information digitalized by the rapid progress in the IT field is a great help to the whole society. In this contest, fashion-related information in database is also a help to fashion-related users. For future fashion information site to make efficient information delivery, an attempt is made to analyze and suggest information architecture of the existing sites. Information architecture means structuring and designing information so that users can get information easily and rapidly. Elements of information architecture include information structuring, navigation, labeling system, and retrieval system. Samsung Design Net and First View Korea, both of which are sites with the largest number of users among fashion information sites, were analyzed in terms if information structuring, navigation, labeling system, and retrieval system to determine advantages and disadvantages. By systematically classifying, labeling, and designing information in future fashion information sites into intuitive navigation, users can find out desired contents easily and rapidly to use as ideas and sources of design and popularize fashion information..
A study on the information architecture of fashion DB
Sanghee Lee,Seunghwan Oh (사)한국디지털디자인협의회 2007 (사)한국디지털디자인협의회 conference Vol.2007 No.1
A lot of information digitalized by the rapid progress in the IT field is a great help to the whole society. In this contest, fashion-related information in database is also a help to fashion-related users. For future fashion information site to make efficient information delivery, an attempt is made to analyze and suggest information architecture of the existing sites. Information architecture means structuring and designing information so that users can get information easily and rapidly. Elements of information architecture include information structuring, navigation, labeling system, and retrieval system. Samsung Design Net and First View Korea, both of which are sites with the largest number of users among fashion information sites, were analyzed in terms if information structuring, navigation, labeling system, and retrieval system to determine advantages and disadvantages. By systematically classifying, labeling, and designing information in future fashion information sites into intuitive navigation, users can find out desired contents easily and rapidly to use as ideas and sources of design and popularize fashion information..
Oh, Keunhee,Kim, Sanghee,Park, Se-Ho,Gu, Hua,Roopenian, Derry,Chung, Doo Hyun,Kim, Yon Su,Lee, Dong-Sup Williams Wilkins 2005 JOURNAL OF IMMUNOLOGY Vol.174 No.4
<P>The role of NKT cells during immune responses is diverse, ranging from antiviral and antitumor activity to the regulation of autoimmune diseases; however, the regulatory function of CD1d-dependent NKT cells in rejection responses against allogeneic graft is uncertain. In this study, we demonstrated the direct regulatory effects of CD1d-dependent NKT cells using an allogeneic skin transplantation model. H-Y-mismatched skin graft survival was shortened in CD1d-/- recipients compared with wild-type recipients. Adoptive transfer of syngeneic NKT cells via splenocytes or hepatic mononuclear cells into CD1d-/- recipients restored graft survival times to those of wild-type recipients. alpha-Galactosylceramide, a specific activator of NKT cells, further prolonged graft survival. Although CD1d-dependent NKT cells did not extend skin graft survival in either major or complete minor histocompatibility-mismatched models, these cells affected graft survival in minor Ag mismatch models according to the magnitude of the antigenic difference. The afferent arm of NKT cell activation during transplantation required CD1d molecules expressed on host APCs and the migration of CD1d-dependent NKT cells into grafts. Moreover, the regulatory effects of CD1d-dependent NKT cells against alloantigen were primarily IL-10 dependent. Taken together, we concluded that CD1d-dependent NKT cells may directly affect the outcome of allogeneic skin graft through an IL-10-dependent regulatory mechanism.</P>
朴祥希,吳明淑 弘益大學校 科學技術硏究所 2004 科學技術硏究論文集 Vol.15 No.-
As the number of coal fired power plant in the domestic power industry increases, amount of fly ash produced from coal power plant is also increasing. Sintered fly ash aggregates were investigated as a area of reutilization of this fly ash. This study was done to investigate the combustion of carbon during the production of sintered fly ash aggregates. Fly ash powders and pellets were used in the experiments. For combustion experiments, the apparatus equipped with an O₂flow/concentration controller, a temperature controller and a recorder was set up. The rate of weight loss and the temperature were measured under various O₂ partial pressures and heating rates. The combustion experiments using fly ash powders showed that the combustion rate was very low at low temperatures, and then rapidly increased once a certain temperature was reached. Both the reaction initiation temperature and the reaction temperature range became lower at higher O₂ partial pressure, and lower heating rates. The combustion rate of the pellets were lower than that of the powders, showing the mass and heat transfer resistances. The effects of O₂ partial pressure and the heating rate on the pellet weight loss were similar to that of the powders.