• Proceedings of the Korean Radioactive Waste Society Conference
• /
• 2005.06a
• /
• pp.96-97
• /
• 2005

• Electrical & Electronic Materials
• /
• v.24 no.5
• /
• pp.12-19
• /
• 2011

• Proceedings of the Korean Society of Tobacco Science Conference
• /
• 2005.05a
• /
• pp.23-23
• /
• 2005

• 한국전기화학회:학술대회논문집
• /
• 2001.10a
• /
• pp.25-25
• /
• 2001

• Proceedings of the KIEE Conference
• /
• 2005.07c
• /
• pp.2007-2009
• /
• 2005

염료감응형 태양전지에 대한 연구 분야에서 다공질 산화물 전극이나 염료 및 전해질 연구에 비해, 상대전극에 대한 연구는 상대적으로 미비한 상태이다. 또한 일반적으로 사용되고 있는 고가의 백금 상대전극을 대체하면서도 촉매 특성이 우수한 새로운 상대전극에 대한 연구의 필요성이 요구된다. 본 연구에서는 우수한 신소재로서 높은 전기전도도 및 전자방출 특성 그리고 높은 표면적을 지니고 있어 전자기기 분야의 다방면에 이용되고 있으며, 최근 대량생산 기술의 개발에 따라 가격이 급격히 하락하고 있는 다중벽 탄소나노튜브(MWCNT)을 이용하여 상대전극을 제조하였다. 이 탄소나노튜브 상대전극을 이용하여 단위 셀을 만들고, 유사 태양광 하에서의 전지의 광전 특성을 측정하였다. 이를 바탕으로 탄소나노튜브 상대전극이 염료감응형 태양전지의 특성 및 수명 안정화에 미치는 영향을 백금 상대전극의 광전 특성과 비교하여 탄소나노튜브의 상대전극으로써의 가능성을 제시하였다.

• Journal of the Korean Chemical Society
• /
• v.35 no.4
• /
• pp.335-342
• /
• 1991

The effect of pressure and temperature on the stabilities of the charge transfer complexes of 1,3,5-trinitrobenzene, tetrachloro-p-benzoquinone and tetracyanoethylene with hexamethylbenzene in carbon tetrachloride has been investigated by spectrophotometric measurements. The equilibrium constants for the formation of the complexes were obtained at various temperature and pressure, and thermodynamic parameters for the formation of the charge transfer complexes are calculated from these values. The relative stabilities of charge transfer complexes with hexamethylbenzene increase in the order; 1,3,5-trinitrobenzene < tetrachloro-p-benzoquinone < tetracyanoethylene. This may be regarded as an order of relative acidity of these compounds in complexation with hexamethylbenzene and is explained in terms of the negative inductive effect of the ${\pi}$ acceptors. The red-shift at higher pressure, the blue-shift at higher temperature and the relation between pressure and oscillator strength are discussed on the basis of thermodynamic functions.

• Journal of The Geomorphological Association of Korea
• /
• v.17 no.3
• /
• pp.31-47
• /
• 2010

The history of mass movement has been reconstructed from the Angol basin in Guryongcheon drainage basin. Sedimentary facies study, radiocarbon dating, particle size analysis, magnetic susceptibility and geomorphological analysis have been performed to reconstruct the paleo-environmental history of Angol basin. From 40,480 to 9,850yrBP there were five periods of slope instability and from 9,850yrBP to present there were at least four periods of slope instability. Magnetic susceptibility curves match well with the sedimentary facies data. This study may help reconstruct the denudational history of the small basins in Cheonan area and could be the cornerstone of the paleo-climatological study of the Korean Peninsula.

• Journal of the Korean Chemical Society
• /
• v.32 no.6
• /
• pp.513-519
• /
• 1988

The effect of pressure and temperature on the stabilities of hexamethylbenzene-1,3,5-trinitrobenzene charge transfer complex in carbon tetrachloride has been investigated by spectrophotometric measurements. The absorption spectra of charge transfer complexes were measured at 25, 40, $50^{\circ}C$ under 1, 200, 500, 1000, 1400 bar in this experiments. The equilibrium constants of the complex were increased with pressure and decreased with temperature rising. The absorption coefficients were increased with pressure and temperature. Change of volume, enthalpy, free energy and entropy for the formation of complexes were calculated from the equilibrium constants. The red-shift observed at a higher pressure, the blue-shift at a higher temperature and the relation between pressure and oscillator strength were discussed by means of thermodynamic fuctions.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.17 no.1
• /
• pp.638-645
• /
• 2016

The purpose of this study was to develop land use planning methods for carbon reduction of transportation and verify the effectiveness. Therefore, this study derived carbon reduction design elements, such as high-density suburb, mixed-use development, pedestrian network and community corridor, which can be applied in the land-use planning stage by examining previous research. The carbon reduction design elements utilized the actual site during the research process. The carbon reductions were estimated using VISUM. Consequently, when carbon reduction design is applied to the site, the carbon emissions declined in the year. As a result of estimating the carbon reduction, approximately 450.7tCO2/yr was reduced.

• Korean Journal of Ecology and Environment
• /
• v.49 no.4
• /
• pp.245-257
• /
• 2016

Although rivers cover only 0.5% of the total land area on the Earth, they are windows that show the integrated effects of watershed biogeochemistry. Studies on the loads and properties of riverine carbon have been conducted because they are directly linked with drinking water quality, and because regional or global net ecosystem production (NEP) can be overestimated, unless riverine carbon loads are subtracted. Globally, ${\sim}0.8-1.5Pg\;yr^{-1}$ and ${\sim}0.62-2.1Pg\;yr^{-1}$ of carbon are transported from terrestrial ecosystems to the ocean via rivers and from inland waters to the atmosphere, respectively. Concentrations, ${\delta}^{13}C$, and fluorescence spectra of riverine carbon have been investigated in South Korea to understand the spatiotemporal changes in the sources. Precipitation as well as land use/land cover can strongly influence the composition of riverine carbon, thus shifting the ratios among DIC, DOC, and POC, which could affect the concentrations, loads, and the degradability of adsorbed organic and inorganic toxic materials. A variety of analyses including $^{14}C$ and high resolution mass spectroscopy need to be employed to precisely define the sources and to quantify the degradability of riverine carbon. Long-term data on concentrations of major ions including alkalinity and daily discharge have been used to show direct evidence of ecosystem changes in the US. The current database managed by the Korean government could be improved further by integrating the data collected by individual researchers, and by adding the major components ions including DIC, DOC, and POC into the database.