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배승묵,정화영,이종호,황진하 한국세라믹학회 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.
Electrical and Optical Properties of Zinc Oxide Thin Films Deposited Using Atomic Layer Deposition
김정은,배승묵,양희선,황진하 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.4
Zinc oxide (ZnO) thin films were deposited using atomic layer deposition. The electrical and optical properties were characterized using Hall measurements, spectroscopic ellipsometry and UV-visible spectrophotometry. The electronic concentration and the mobility were found to be critically dependent on the deposition temperature, exhibiting increased resistivity and reduced electronic mobility at low temperature. The corresponding optical properties were measured as a function of photon energy ranging from 1.5 to 5.0 eV. The simulated extinction coefficients allowed the determination of optical band gaps, i.e., ranging from 3.36 to 3.41 eV. The electronic carrier concentration appears to be related to the reduction in the corresponding band gap in ZnO thin films.
Effect of graphite content on cell performance and microstructure in solid oxide fuel cells
유영성,최미화,배승묵,황진하 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.4
The presence of graphite materials in the anode composites of high-temperature solid oxide fuel cells exerts a significant effect on the microstructure of the electrodes and electrochemical performance of the cells. Herein, the amount of graphite in the anode materials was intentionally varied during the electrode processing steps. The effect of graphite content on cell performance was evaluated in terms of the resultant microstructure, mechanical strength, and electrochemical performance. A higher quantity of graphite in the anode composite leads to higher porosity, and consequently, to the opposing effects of enhanced electrochemical performance during the initial stages and faster degradation of the current-voltage characteristics. However, among the evaluated graphite-controlled anodes, the one with the lowest graphite content exhibited the slowest degradation rate and a fairly poor electrochemical performance. The balance between the microstructure and the corresponding electrochemical performance is discussed in terms of the optimization of high-performance solid oxide fuel cells.
시멘트계 자기치유 시편에 대한 반사전자현미경 이미지 분석을 위한 함침과 연마의 중요성
김동현,강국희,배승묵,임영진,이승헌 한국건설순환자원학회 2017 한국건설순환자원학회 논문집 Vol.5 No.4
자기치유에 관한 연구는 현재 다각화되었으며 연구를 평가하는 방법도 다양해졌다. 그중에서, 스캐닝 전자 현미경(SEM)을 통해획득된 반사전자(BSE) 이미지는 균열에서의 자기치유 효과를 평가하는 수단으로 시도되었다. BSE 이미지를 평가하기 위해서정교한 시편 전처리가 대단히 중요하다. 에폭시 함침은 경화체의 입자, 기공과 인공 균열 내부에 투입되어 새롭게 생성된 자기치유 수화물의 구조를 안정화시키고 변형 없이 연삭 및 연마의 응력을 견딜 수 있게 한다. 함침 시편은 표면을 매끄럽게 하고고해상도의 BSE 영상을 얻기 위해 건조 연마 후 습식 연마용 다이아몬드 서스펜션으로 연마한다. 함침과 연마가 된 자기치유시편의 자기치유 수화물을 평가한 결과, 생성된 수화물은 인공균열의 표면에 형성되었으며 자기치유 물질은 Ca(OH)2와 C-S-H로 확인되었다.
Ion Activation in Boron-doped Polycrystalline Si Thin Films Prepared on Glass Substrates
소병수,박찬록,배승묵,김영환,황진하 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.7
Boron-implanted polycrystalline Si thin films were subjected to thermal annealing. Their evolvingelectrical and structural features were characterized using Hall measurements, Raman Spectroscopy,transmission electron microcopy, and UV-Visible transmittance spectrophotometry. TheRaman analysis indicated that boron implantation did not induce structurally significant damage,i.e., lattice distortion. Even low-temperature annealing at 350 C provided a high degree of activation,keeping the atomic structure restored on the short-range order, as confirmed by transmissionelectron microscopy and optical transmittance data. At temperatures above 350 C, the chargecarriers exhibited temperature-independent behaviors, with a charge carrier concentration of 6 or7 × 1019/cm3. The boron-implanted Si thin films were found to be subject to electronic stoppingrather than nuclear stopping, thus allowing for low-temperature activation.
디지털 이미지 분석을 이용한 fly ash의 원형지수 측정
이승헌,김홍주,배승묵,이원준,E.Sakai,M.Daimon 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.8
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: ①image acquisition ②grey image processing ③detection the component to measure ④binary image processing ⑤feature 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. 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 ⓛ이미지 획득, ②이미지 전처리, ③검출, ④이미지 후처리, ⑤측정의 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.