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가스화 조건에서 슬래그 성분이 크롬계 내화재 미세구조 변화에 미치는 영향
오명숙(Oh, Myong-Sook),김한봄(Kim, Han-Bom),박우성(Park, Woo-Sung) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
The inside wall of a coal gasifier is lined with refractory, and the corrosion of the refractory by coal sag is an important parameter affecting the refractory lifetime and the replacement period. This paper examines the changes in microstructure of a chromia refractory due to chemical reactions with penetrating slag as a function of slag composition. The effects of CaO and Fe₂O₃ concentrations were studied using Datong and KIDECO slag. Static corrosion experiments were carried out, the percent slag penetration and changes in the microstructure were determined by SEM/EDX analyses. FactSage equilibrium calculations were carried out to determine the equilibrium products and the predictions were compared with experimental observations.
공대 여학생 진로장벽과 관련된 공대 교수의 성인지적 태도 탐색
김지현,정윤경,오명숙,Kim, Ji-Hyeon,Jeong, Yoon-Kyung,Oh, Myong-Sook 한국공학교육학회 2011 공학교육연구 Vol.14 No.1
국내 공대 여학생의 전공 진로 장벽과 관련된 사회 환경적 요인을 탐색하기 위하여 공대 교수들의 성인지 인식 및 행동을 파악하고 여학생 비율이 높은 타 전공 교수와 비교하였다. 220명의 교수(공대 169명, 비공대 51명) 설문조사 결과 공대 비공대 교수들 모두 여학생들이 학업과 관련된 능력보다는 모험정신, 리더십, 능동성, 자신감 등과 같은 소프트 스킬이 부족하다고 답변하였다. 여학생의 전공 분야 진출 가능성에 대해서는 공대 교수들이 비 공대 교수 보다 높은 수준의 기대를 나타냈으나 직장에서의 핵심 업무 담당, 리더십 발휘 가능성에 대해서는 더 낮은 수준의 기대치를 보였다. 공대 교수들의 수업 관련 성인지 행동 수준은 비 공대 교수보다 낮았으며 여학생들이 실제 인식하는 수준보다 자신의 성인지적 행동 수준을 더 높게 평가하였다. 또한 여학생의 전공 분야 취업 확대를 위한 교육 강화 필요성에 대해 비 공대 교수보다 낮게 인식하고 있었으며 참여 의지도 낮은 것으로 나타 났다. 이러한 결과를 통해 공대 여학생 교육 강화를 위해서는 공대 교수들의 여학생에 대한 인식 제고를 위한 활동이 선행되어야 함을 확인할 수 있었다. The present study was carried out to investigate gender-related attitudes of professors in engineering as a socio-environmental factor for career barriers of female engineering students. For this purpose, 220 professors, 169 in engineering and 51 in non-engineering, completed questionnaires that evaluated gender-related knowledge, behavior, and career expectations. Our results showed that both engineering and non-engineering professors showed a low level of knowledge of gender differences. Both groups selected soft skills such as leadership, initiative and self efficacy as lacking in female students, rather than their academic skills. Professors in engineering showed higher expectations of female students pursuing a career in engineering but lower expectations for working on core projects and taking leadership at the workplace than the professors in non-engineering. The level of gender-sensitivity related to teaching was lower for professors in engineering than those in non-engineering, although professors in engineering evaluated their gender sensitivity higher than the evaluation of their female students. In addition, professors in engineering opted less for developing programs for female student career development in engineering than professors in non-engineering, and they showed a low interest level in participating in such programs. This study showed that the efforts to make engineering professors aware of the characteristics of female students should precede the development of education programs.
석유코크스와 혼합된 국내무연탄과 수입유연탄 슬래그의 특성 규명
김민경(Kim, Min-Kyung),오명숙(Oh, Myong-Sook S.) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
The vanadium rich ash of petroleum coke can give a slagging problem during because of the high melting point of V₂O₃. For continuous removal of the slag, petroleum coke is often mixed with coal, and the viscosity of the mixed slag is an important property, determining the gasification temperature. The viscosities of the mixed slag from various mixing ratios of petroleum coke and a bituminous coal were investigated. When mixed with a crystalline coal slag, T_{cv} was increased at a higher the coke content in the mixed feed. When the V₂O₃ concentration was greater than 4.5%, it was difficult to get accurate measurements of T_{cv}. The SEM/EDX analyses of the cooled slag revealed that the major crystalline phase was anorthite, and T_{cv} should be related to the formation temperature of anorthite. The SEM/EDX analyses also showed that, at low concentrations of vanadium, part vanadium formed a crystalline phase with Al-Si-Ca-Fe, and the rest remained in the glassy phase, suggesting that vanadium existed as a slag component at the low viscosity region. At a high concentration, vanadium forms a phase with Ca, and the Ca-V phase was separated from the slag phase, and formed a layer above the slag. FeO in petroleum coke also played an important role determining viscosity: at high temperatures, increased FeO lowered the viscosity, but as it formed a spinel phase, the depletion of FeO in the slag resulted in a higher viscosity.
결정슬래그의 T<sub>cv</sub> 측정 시 실험변수에 따른 영향
김유나(Kim, Yu-Na),오명숙(Oh, Myong-Sook S.) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
For crystalline slags, of which the viscosity rapidly increases at T_{cv} due to the formation of crystalline phases, the Tcv is affected by measurement conditions. In this study, we investigated the effect of cooling rate, and alumina dissolution on the determination of T_{cv}. Using synthetic slag samples based on the composition of Alaska Usibelli slag, T_{cv} were determined under a constant cooling rate of 2?C/min, and under rapid cooling with holding time to allow the slag to reach thermal and rheological equilibrium. The effect of alumina dissolution was investigated using platinum lined crucibles. The constant cooling resulted in lower T_{cv} by 33?C as compared to the equilibrium measurements. Under 2?C/min cooling, the blocking alumina dissolution resulted in lower T_{cv} by 23?C. When the T_{cv} was measured under 2?C/min cooling using an alumina crucible, therefore, the effects of a constant cooling is somewhat offset by the alumina dissolution effect, and bring the measured value closer to the true value.