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Bae, Seung-Muk,Jung, Hwa-Young,Lee, Jong-Ho,Hwang, Jin-Ha The Korean Ceramic Society 2010 한국세라믹학회지 Vol.47 No.1
Among various fuel cells, solid oxide fuel cells (SOFCs) offer the highest energy efficiency, when taking into account the thermal recycling of waste heat at high temperature. However, the highest efficiency and lowest pollution for a SOFC can be achieved through the sophisticated control of its constituent components such as electrodes, electrolytes, interconnects and sealing materials. The electrochemical conversion efficiency of a SOFC is particularly dependent upon the performance of its electrode materials. The electrode materials should meet highly stringent requirements to optimize cell performance. In particular, both mass and charge transport should easily occur simultaneously through the electrode structure. Matter transport or charge transport is critically related to the configuration and spatial disposition of the three constituent phases of a composite electrode, which are the ionic conducting phase, electronic conducting phase, and the pores. The current work places special emphasis on the quantification of this complex microstructure of composite electrodes. Digitized images are exploited in order to obtain the quantitative microstructural information, i.e., the size distributions and interconnectivities of each constituent component. This work reports regarding zirconia-based composite electrodes.
Microstructural characterization of multiphase GDC/NiO composites using image processing
Seung-Muk Bae,Kyoung-Soo Kang,박주식,황진하 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.6
Image processing was employed in combination with electron microscopy to quantitatively estimate the spatial microstructure in a multi-phase mixture used in energy-based applications. The original images were obtained using scanning electron microscopy in complementary modes, i.e. secondary electron and back-scattered electron modes. Based on the digitized and optimized images, the microstructural characterization incorporates quantitative information for each constituent, i.e. the fraction, size distribution, and contiguity. The refined image analysis procedure was applied to a mixture composed of an ionic conductor and an electronic conductor, Gd2O3-Doped CeO2 and NiO. The implications of the image processing are discussed with regard to sophisticated synthesis and processing of renewable energy materials.
Extraction of Quantitative Parameters for Describing the Microstructure of Solid Oxide Fuel Cells
Bae, Seung-Muk,Kim, Yong-Hoon,You, Yil-Hwan,Hwang, Jin-Ha Cambridge University Press 2013 Microscopy and microanalysis Vol.19 No.5
<B>Abstract</B><P>Digital quantification of a two-dimensional structure was applied to a GDC(Gd2O3-doped CeO2)/LSM(La0.85Sr0.15MnO3) composite cathode employed for solid oxide fuel cells. With the aid of high-resolution imaging capability based on secondary and backscattered electron images, two-dimensional electron micrographs were converted to digital binary files using an image processing tool combined with the line intercept method. Statistical analysis combined with a metallurgical tool was employed to determine microstructural factors, i.e., volume fraction, size distribution, and interconnectivity. The current work reports the quantification of the two-dimensional structural images of GDC/LSM composites applicable to solid oxide fuel cells, with the aim of obtaining the volume fraction, size distribution, and interconnectivity as functions of composite composition. The volume fractions of the solid constituent phases exhibit compositional dependence in cathodes; however, LSM interconnectivity increases gradually as a function of LSM composition, whereas that of GDC decreases significantly at 50 wt% LSM.</P>
Direct oxidation growth of P-type semiconducting CuO nanowires.
Bae, Seung-Muk,Ahn, Jae-Pyeong,Hwang, Jin-Ha American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.8
<P>P-type copper oxide nanowires (NWs) were grown on metallic copper plates and sapphire substrates. Significant variations in the morphology and distribution of the NWs, due to underlying differences in the growth mechanism and the NW densities, were observed based on the nature of the substrate utilized. The use of copper plates induced an extremely high density of copper oxide nanowires on temperature-dependent copper oxide layers. However, the sapphire substrates gave rise to highly superior CuO NWs without any involvement of an oxide layer, leading to a low density of copper oxide NWs. Systematic characterization of the as-grown copper oxide NWs using X-ray photoelectron microscopy and Raman spectroscopy indicated that the NWs were comprised of CuO with Cu2+ metallic ions.</P>
Bae, Han-Sol,Yoon, Won-Joon,Cho, Young-Dan,Islam, Rabia,Shin, Hye-Rim,Kim, Bong-Soo,Lim, Jin-Muk,Seo, Min-Seok,Cho, Seo-Ae,Choi, Kang-Young,Baek, Seung-Hak,Kim, Hong-Gee,Woo, Kyung-Mi,Baek, Jeong-Hwa Wiley (John WileySons) 2017 Journal of Bone and Mineral Research Vol. No.
<P>Cleidocranial dysplasia (CCD) is an autosomal dominant skeletal disorder caused by mutations in RUNX2, coding a key transcription factor of early osteogenesis. CCD patients suffer from developmental defects in cranial bones. Despite numerous investigations and clinical approaches, no therapeutic strategy has been suggested to prevent CCD. Here, we show that fetal administration of Entinostat/MS-275, a class I histone deacetylase (HDAC)-specific inhibitor, partially prevents delayed closure of cranial sutures in Runx2(+/-) mice strain of C57BL/6J by two mechanisms: 1) posttranslational acetylation of Runx2 protein, which stabilized the protein and activated its transcriptional activity; and 2) epigenetic regulation of Runx2 and other bone marker genes. Moreover, we show that MS-275 stimulates osteoblast proliferation effectively both in vivo and in vitro, suggesting that delayed skeletal development in CCD is closely related to the decreased number of progenitor cells as well as the delayed osteogenic differentiation. These findings provide the potential benefits of the therapeutic strategy using MS-275 to prevent CCD. (c) 2017 American Society for Bone and Mineral Research.</P>
디지털 이미지 분석을 이용한 Fly Ash의 원형지수 측정
Lee, Seung-Heun,Kim, Hong-Joo,Bae, Soon-Muk,Lee, Won-Jun,Sakai, Etsuo,Daimon, Masaki 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.8
미분탄 화력발전소에서 보일러의 부하를 변화시켰을 때 전기집진기에서 단별 채취한 fly ash에 대해서 디지털 이미지 분석을 이용하여 원형지수를 검토하였다. 원형지수 측정은 다음과 같은 다섯 단계, 즉 ① 이미지 획득, ② 이미지 전처리, ③ 검출, ④ 이미지 후처리, ⑤ 측정의 단계를 거쳐 이루어 졌다. Fly ash의 평균 원형지수는 0.78∼0.83의 범위를 나타냈으며, 같은 위치에 있는 호파에서 채취한 fly ash는 보일러의 부하에 관계없이 유사한 원형지수 값을 나타냈다. 그리고 첫 번째 호파에서 세 번째 호파로 갈수록, 즉 fly ash의 평균 입경이 작아질수록 원형지수는 증가하는 경향을 나타냈다. This paper investigates circularity of fly ashes using the digital image processing. Fly ashes directly collect from electrostatic precipitator when the load of conditions of boiler are changed at a coal-fired power plant. Circularity measurement can be accomplished in five steps: ① image acquisition, ② grey image processing, ③ detection the component to measure ④ binary image processing ⑤ feature measurement. The mean circularity of fly ashes is in the range of 0.78 to 0.83. fly ashes collected from the same hopper has similar circularity regardless of the load of boiler and circularity increases as going from the 1st hopper to 3rd one, namely as particle size become finer.