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김광대,서보열,이주열,송영섭,홍은미,김영독,임동찬,조신욱 한국물리학회 2015 Current Applied Physics Vol.15 No.9
We fabricated organic photovoltaic (OPV) devices containing various Au nanostructures mixed with hole-collecting buffer layer. The presence of the Au nanostructures results in enhancement of the external quantum efficiencies (EQE) at dissimilar wavelengths of visible light, which can be attributed to the modulated plasmonic absorption frequency of the Au nanostructures. In addition to this plasmonic effect induced by visible light absorption, an increase in the EQE was also found upon UV excitation, which can be attributed to scattering effects induced by Au particles. The optical response pattern of organic photovoltaic devices can be modulated in a wide range of visible and UV wavelengths, by controlling sizes and shapes of the Au nanostructures.
Porous Silica Particles as Oil Absorbents: Comparison of Meso-, Macro-, and Meso/Macro-Structures
김광대,조윤경,한상욱,박은지,김대한,정명근,김영독,문종우,홍은미,임동찬 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.7
Silica particles with three different pore structures were synthesized, consisting of only-meso-, only-macro-, and both meso/macro-pores. The meso-pores were approximately 3–30 nm in diameter, whereas the macro-pores were larger than 500 nm. By using chemical vapor deposition of polydimethylsiloxane (PDMS) on porous silica, the surfaces of the silica became completely hydrophobic. The surfaces on which the PDMS-coated silica particles were distributed showed water contact angles close to 170° and the particles floated perfectly on water. The silica with both meso- and macro-pores showed a much higher oil absorption capacity (2.5–3 times higher capacity) than the other samples with either only meso- or macro-pores. The superior oil absorption capacity of the meso/macro-porous silica was primarily attributed to the extraordinarily high porosity.
Change in Water Contact Angle of Carbon Contaminated TiO2 Surfaces by High-energy Electron Beam
김광대,Wei Sheng Tai,김영독,Sang-Jin Cho,부진효,배인섭,이병철,Ki Ho Yang,Ok Kyung Park 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.5
We studied change in water contact angle on TiO2 surfaces upon high-energy electron-beam treatment. Depending on conditions of e-beam exposures, surface OH-content could be increased or decreased. In contrast, water contact angle continuously decreased with increasing e-beam exposure and energy, i.e. change in the water contact angle cannot be rationalized in terms of the overall change in the surfacestructure of carbon-contaminated TiO2. In the C1s spectra, we found that the C-O and C=O contents gradually increased with increasing e-beam energy, suggesting that the change in the surface structure of carbon layers can be important for understanding of the wettability change. Our results imply that the degree of oxidation of carbon impurity layers on oxide surfaces should be considered, in order to fully understand the change in the oxide surface wettability.
체외수정시술의 결과를 예측할 수 있는 인자로서 난구세포의 활용에 관한 연구
김광대,김기형,나용진,이규섭,Kim, Kwang-Dae,Kim, Ki-Hyung,Na, Yong-Jin,Lee, Kyu-Sup 대한생식의학회 1999 Clinical and Experimental Reproductive Medicine Vol.26 No.3
Objective: To establish the evaluation system of the quality of oocytes on the basis of the incidence of cumulus cells apoptosis, to investigate the relationships beween the incidence of cumulus cells and the outcomes of IVF-ET. Method: Thirth-four cycles undergoing controlled ovarian hyperstimulation for IVF-ET with tubal infertility (23 cycles) or unexplained infertility (11 cycles) were included in this study. Cumulus cell masses surrounding mature oocyte and co-culture of embryos with autologous cumulus cells during IVF-ET process. The incidence of apoptosis in cumulus cells was assessed by apoptosis detection kit fluorescein. The effect of co-culture using cumulus cells and the incidence of cumulus cells apoptosis. Results: The results were as follows: 1. The incidence of apoptosis in cumulus cells markedly increased in patients aged 40 or over, while the fertilization rate was greatly decreased in those age group. 2. Apoptosis in cumulus cells was found in both the fertilized oocytes and unfertilized oocytes, but the incidence of apoptosis was higher in unfertilized oocytes. 3. There is no clear correlation between apoptosis in cumulus cells and the number of oocytes retrieved. However, the incidence of apoptosis was increased when the number of oocytes retrieved was 5 and fewer in comparison with $6{\sim}10$. 4. Embryo grade was significantly affected by the incidence of apoptosis in cumulus cells. 5. Pregnancy rate of IVF-ET per cycle was 29.4%, and the pregnant group had the higher fertilization rate and a significantly lower incidence of apoptosis in cumulus cells compared with the nonpregnant group. 6. When cumulus cells were used as helper cells in the co-culture of the embryo, in vitro activity of cumulus cells based on morphological change and proliferation did not influence the quality of embryo, but was closely associated with the implantation rate and pregnancy rate, which was enhanced when morphological changes and proliferation of cumulus cells was more active. 7. This difference in the outcome of IVF-ET according to in vitro activity of cumulus cells used for co-cultue was not associated with the incidence of apoptosis in cumulus cells; but rather had likely relations with the different secretion pattern of protein, which may be an embryo trophic factor by cumulus cells. Conclusion: These results suggest that the incidence of apoptosis in cumulus cells can be used in predicting oocyte qualities and the outcomes of IVF-ET. And the effect of co-culture largely depends on the in vitro activity of cumulus cells as well.