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이학인(Hak-in Lee),유승열(Seong-yeol Yoo),이지은(Ji-eun Lee),노명규(Myoungyu Noh) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
We have designed a micro flywheel energy storage system in which the flywheel stores the electrical energy in terms of the kinetic energy and converts this kinetic energy into the electrical energy when necessary. The flywheel is supported by two radial permanent magnet passive bearings. Permanent magnet passive bearings use the repulsive forces between two sets of permanent magnets so that contact free rotation is possible. The toroidally-wound BLDC motor which has high efficiency and little additional negative radial stiffness is used for motoring and generation. Micro flywheel energy storage system is optimally designed to have the maximum energy storage capacity. In this paper, we present the design process of the micro flywheel energy storage system.
이학기,임용진,민경은,최흥진,Hak-Ki Lee,Yong Jin Lim,Kyung Eun Min,HeungJin Choi 대한화학회 1984 대한화학회지 Vol.28 No.6
We obtained fast dyed polypropylene fiber, which has no functional group to be dyed, by producing a carbene on the dye molecule by the pyrolysis of lithium salt of dye molecule-tosylhydrazone, then the carbene simultaneously inserted into a C-H bond of polypropylene. To investigate the possibility of actual use in the industry, a variety of reactive azo dyes were prepared from aldehyde, acetophenone and benzophenone derivatives by changing reactive site of precursors which greatly affected properties of dyes. Reactive dyes of the benzophenone derivatives were excellent in the reaction with polypropylene, especially, a dye prepared from chloroaminobenzophenone with N,N-dimethyl aniline was found most excellent. 難染性纖維인 폴리프로필렌用 反應性染料를 開發하기 위하여 反應部位로서 카르벤을 染料에 生成케하여 폴리프로필렌의 C-H結合에 揷入反應을 시켜 堅固한 染着物을 얻을 수 있었다. 反應性카르벤染料의 前驅體로서 알데히드係, 메틸케톤係 및 페닐케톤係 反應性染料를 合成하고 카보닐基에 토실히드라진 및 부틸리튬을 各各 作用하여 各種染料의 토실히드라존리튬鹽을 만들어 폴리프로필렌상에서 加熱分解시킴으로써 染料分子에 生成된 카르벤이 폴리프로필렌에 共有結合을 하여 染着하였다. 여기에서 合成한 各種 카르벤染料들은 카르벤이 生成되는 隣接位에 있는 置換基의 種類와 位置에 따라 反應性에 差異點을 나타내었다. 특히 페닐케톤係 反應性染料가 反應性이 優秀하였으며 이들 페닐케톤係 反應性染料의 前驅體中에서도 클로로基를 가지는 클로로아미노벤조페논으로부터 合成한 染料가 他에 비해 反應性이 良好하였다.