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- 저자 : 원보람 ( Won Boram ) (검색결과 2 건)
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High-flexible Electrolyte Supported SOFCs via Transformable Tetragonal Phase of YSZ
Boram Won(원보람),Jaeha Myung(명재하) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7
The conventional ceramic based SOFCs (Solid Oxide fuel Cells) have limitations in commercialization, owing to the brittleness of solid electrolytes, which leads to mechanical fracture under external stress. Herein, a new concept of high-flexible electrolyte supported SOFCs with a bendable YSZ (yttria-stabilized zirconia) electrolyte is introduced to enhance the mechanical stability and long-term operation. YSZ consists of the transformable tetragonal phase, which transforms into monoclinic structure when the mechanical stress is applied. The phase transformation of YSZ is accompanied with 4% volume expansion, showing high flexibility and mechanical tolerance. In addition, the flexibility reduced the thickness of YSZ film up to ~17 ㎛, making the electrolyte film more bendable with minimum ohmic resistance. The flexibility of YSZ electrolyte was controlled by the microstructure, grain size, fraction of tetragonal phase, and tetragonality under various sintering condition. The flexible SOFC was prepared by using simple methods such as tape-casting and screen-printing. A single cell with Ni-YSZ anode (11 ㎛)|YSZ electrolyte (50 ㎛)|LSM-YSZ cathode (25 ㎛) exhibited maximum power density of 0.583 Wcm<sup>-2</sup> at 900℃ under wet H2. This study suggests the possible applications of SOFCs in mobile devices such as unmanned aircrafts without thermomechanical failure.
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설득적 글쓰기와 정서 표현 글쓰기에 나타난 표현 양상 -강원국·김민식의 저서와 강연 분석을 중심으로-
권순희 ( Kwon Soonhee ),김여흘 ( Kim Yeoheul ),신소연 ( Shin Soyeon ),안병현 ( Ahn Byeonghyun ),원보람 ( Won Boram ) 서울대학교 국어교육과 2021 先淸語文 Vol.49 No.-
In order to examine the connection between logical and emotional writing and writing theory, Kang Wonguk’s book ‘President‘s writing’ and Kim Minsik’s book ‘Did you write every morning?’ were selected as the texts to analyze, and ‘Time to change the world, 15 minutes’, ‘How to Write Moving People (Kang Wonguk)’ and ‘Writing that Changes Pain to Pleasure (Kim Minsik)’ were selected for analysis. The analysis results are shown in the table below. The above difference comes from the difference between the purpose and direction of discourse between Kang Wonguk and Kim Minsik. Kang Wonguk explains his speeches and talks to persuade others in his writings and lectures. Therefore, Kang Wonguk’s writing focuses on logical writing, and the direction of writing is directed to the outside. Kim Minsik, on the other hand, mentions diaries and personal blog posts and talks about self-reflective and internal discourse. The direction of writing is directed inward, communicating with the self, and in the process of self-healing through writing.
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