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기계적 합금화법으로 제조된 고온 수전해용 Ni/YSZ 전극의 미세구조 특성
박근만,채의석,홍현선,추수태,Park Keun-Man,Chae Ui-Seok,Hong Hyun Seon,Choo Soo-Tae 한국재료학회 2004 한국재료학회지 Vol.14 No.10
Modified Ni/YSZ cermets for high temperature electrolysis were synthesized by the direct ball milling of Ni and YSZ powder. The ball milling was carried out in dry process and in ethanol with varying milling time. While the dry-milling decreased the average size from 65 to $80{\mu}m$, the wet-milling decreased the average size down to $10{\mu}m$. In addition, very fine particles less than $0.1{\mu}m$ were observed in the wet-milling condition. The subsequent process of cold-pressing and sintering at $900^{\circ}C$ for 2 h did not affect the particle size of dry-milled powder. The electrical conductivity of the dry-milled Ni/YSZ cermet showed the value of $5{\times}10^{2}\;S/cm$ and this value was increased to $1.4{\times}10^{4}\;S/cm$ after the sintering at $900^{\circ}C$ for 2 h.
박근아(朴槿娥) 한국미술연구소 2016 美術史論壇 Vol.- No.42
Not only the visual image such as postcards, posters, textbooks and novels illustrations, newspaper ads, etc. due to the printing technology introduced through Japan during the time of enlightenment in Korea, but also a variety of types of printed pictures such as reproduced ones by famous painters had got to be prepared. Among which bird and flower paintings were mass-produced and spread throughout the country. For printed bird and flower paintings the auspicious motifs such as pine and crane, tiger and bamboo, peonies and peacocks, eagles, a group of chickens were often used. The motifs such as pine and crane, tiger and bamboo can be also found in our Korean traditional paintings, but in the composition and style the influence of Japanese painting style is detected. The printed pictures were already introduced into the country and distributed nationwide in the 1920s, which had been used mainly in the form of a folding screen until the 1980s, in the feasting spaces, such as wedding ceremonies and the 60th birthday parties. Such folding screens were printed to form a new demand as a “new art” in the art market in the 20th century, which replaced the place of folk paintings having existed as the existing public art. Rather, the fact that folk artists have actively borrowed and transfigured the motif of the printed folding screens and tried to fit in a then fashioned taste can be found through existing handwriting folk paintings. We are looking forward to that you can identify the visual culture by newly shedding light on the relationships between printed folding screens and folk paintings in a fashion all over the 20th century, and take it a base to access the folk ones on a broader perspective.
복합단면을 갖는 비 감쇠 보 구조물의 유한요소 고유치 해석
박근만,조진래,정의봉,배수룡,Park, Keun-Man,Cho, Jin-Rae,Jung, Weui-Bong,Bae, Soo-Ryong 한국전산구조공학회 2007 한국전산구조공학회논문집 Vol.20 No.6
보 구조물의 고유치 해석의 경우 보 이론에 근거한 기존의 다양한 방법들을 통해 효율적이고 수월하게 수행이 가능하다. 하지만 보의 단면이 두 가지 이상의 복합재질로 구성되어 있을 경우 전통적인 보 이론을 적용하기 위해서는 단일의 등가 물성을 산출해야할 필요가 있다. 본 논문에서는 복합단면 보 구조물의 효율적인 유한요소 고유치 해석을 위해 등가의 물성을 산출하였다. 이론 연구를 토대로 개발한 연구용 프로그램으로 대표적인 보 구조물에 대한 유한요소 고유치 해석을 수행하였으며, 해석결과에 대한 신뢰성 검증을 위해 상용 소프트웨어인 ANSYS의 3차원 솔리드 모델의 해석결과와 비교하였다. Numerical eigen analysis of beam-like structure can be easily and effectively done by various conventional beam theory-based methods. However, in case of the structures composed of composite-sectioned beams, the application of conventional numerical methods requires one to derive both equivalent material and geometry properties. In the present paper, these equivalent properties are derived by the transformed section method and the test FEM program is coded. The numerical accuracy of the proposed method is verified through the comparison with the ANSYS 3-D model.