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Methylcyclopentane의 Ring Enlargement 반응용 백금계 촉매의 비활성화 및 재생에 관한 연구
윤선혜,박은서,이동현,이철호,전종기 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Methylcyclopentane 으로부터 ring enlargement 반응을 통해 부가가치가 높은 benzene을 제조할 수 있다. 본 연구에서는 methylcyclopentane의 ring enlargement 반응 공정에서 발생되는 폐촉매를 재생시키는 연구를 수행하였다. 장시간 운전을 통해서 비활성화된 백금계 촉매의 활성 저하의 원인분석을 위하여 BET, XRD, XRF, NH<sub>3</sub>-TPD, H<sub>2</sub>-TPR, Chemisorption, TGA 등 다양한 특성분석을 실시하였다. 또한, MCP의 Ring enlargement 반응에서 다양한 조건에서 재생된 촉매의 활성도를 비교 분석하였다.
소형 무미익 BWB 무인 항공기의 안정성 및 조종성 증대
윤선혜,이학태,심현철 한국항공우주학회 2011 한국항공우주학회 학술발표회 논문집 Vol.2011 No.4
무미익 BWB 항공기는 형태의 특이성이 갖는 여러 가지 장점으로 인해 군사용으로 많이 개발되고 있다. 그러나 미익이 없기 때문에 일반적인 항공기와 달리 롤과 요 방향의 안정성과 조종성에 있어 불리한 특징을 보인다. 본 논문에서는 이러한 무미익 BWB 항공기의 단점을 개선하기 위해, 소형의 무미익 BWB 무인 항공기에 윙릿과 MiTE 장치를 적용하여 비행실험을 수행하였으며, 기체의 안정성 및 조종성 증대에 미치는 영향을 확인하고자 하였다. Tailless BWB aircraft have been developed for military since the advantages by uniqueness of the shape. However, they have drawbacks for roll and yaw stability and maneuverability unlike conventional aircraft since there is no tail wing. In this paper, we implemented the flight test to improve the shortcomings of tailless BWB aircraft by applying the winglet and MiTE to small tailless BWB unmanned aircraft. And then we confirmed the effect of winglet and MiTE.
다문화 가정 아동을 위한 방과후 요리활동 프로그램의 만족도 및 효과
윤선혜,박신진,진소연 한국식생활문화학회 2015 韓國食生活文化學會誌 Vol.30 No.5
This study examined the satisfaction level and effects of after-school program cooking activities in children of multicultural families. A total of 135 children of general and multicultural families from 3th to 6th grades and their 11 teachers were surveyed, and 75 multicultural family children underwent a cooking activity program. Children of multicultural families showed higher participation in cooking activities than other Korean children. Children of multicultural families wanted to be involved in cooking activity programs after school more than other Korean children. These children also showed a higher rate of wanting to cook Korean foods compared to children of general families. Regarding reasons for participating in cooking activities, ‘I think I’m glad to be served delicious food’ response was the most common. Children of multicultural families showed higher participation in cooking activities than children of general families. Regarding school life changes, children of multicultural families were found to be less picky of foods in general as well as kimchi and vegetables. In conclusion, cooking activity programs for children of multicultural family showed beneficial effects on diet and understanding of Korean culture.
윤선혜(Seon Hye Yoon),이재훈(Jaehun Lee),권장혁(Jang Hyuk Kwon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
An optimization for the maximum thrust of a flapping airfoil is investigated using a DACE(Design and Analysis of Computer Experiments). Navier-Stokes equations are solved to compute unsteady flow field of a flapping airfoil. Since it is inefficient to use unsteady flow analysis in the optimization, DACE is used to replace the flow analysis to save the calculation time. The flapping motion of airfoil consists of pitching and plunging motions. Design variables are control parameters of airfoil motion, pitching amplitude, plunging amplitude, and reduced frequency. The average thrust coefficient varies as these parameters vary. In this study, the plunging motion was considered only. The optimization results show that the average thrust coefficient has the maximum values at specific points of control parameters.