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부스닥트용 내열성 에폭시 분체도료의 절연 및 열화 특성 연구
강철화,박지군,박종규,주현돈,김현희,Kang, Cheolhwa,Park, Ji-Koon,Park, Jong-Kyu,Ju, Hyun-Don,Kim, Hyun-Hee 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.9
Reported here are results of the mechanical and electrical properties of both of intact and thermally degraded epoxy-coated copper busducts that are made by fluidized bed process. To elucidate and compare the properties mentioned above, electrical breakdown by thermal and water aging, v-t characteristic, bending test, impact test and cross cut test are carried out. Although the performance of electrical and mechanical properties are gradually decreased in increasing the severe conditions such as temperature, aging time, and so forth, sample C has a better performance in both mechanical and electrical properties.
강철화(Kang, Chul-Hwa),최지현(Choi, Ji-Hyun),박지군(Park, Ji-Kun),주현돈(Ju, Hyun-Don),김현희(Kim, Hyun-Hee) 한국화재소방학회 2011 한국화재소방학회 학술대회 논문집 Vol.2011 No.추계
대용량 기기의 효율적인 전력 공급을 위해 부스닥트의 수요가 급증하고 있으며, 특히 컴팩트형 부스닥트는 케이블에 비해 무게와 부피가 가볍고 전력 효율도 25% 이상 우수하며, 기술의 핵심은 에폭시분체도료의 절연 특성 향상과 제작공정의 최적화와 안정화이다. 따라서 본 연구에서는 유동침적방식(Fluidized Bed Process)에 대한 최적화와 에폭시 분체도료의 절연설계 및 열화특성에 대해 실험 검토 하였다. 또한 전기화재의 주된 원인인 아크방전특성과 절연파괴 특성에 대한 분석과 더불어 다양한 상용제품들의 특성을 비교하였다.
KNbO<sub>3</sub> 치환이 (Li,Na,K)(Nb,Sb,Ta)O<sub>3</sub>계 세라믹스의 유전 및 압전 특성에 미치는 영향
노정래,류주현,이상돈,Noh, Jungrae,Yoo, Ju-Hyun,Lee, Sang-Don 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.3
In this study, $KNbO_3$-substituted (Li,Na,K)(Nb,Sb,Ta)$O_3$ ceramics were investigated to develop Pb-free composition ceramics for multilayer actuator and energy harvester applications. The X-ray diffraction analysis indicated that all samples were pure perovskite phase and no secondary phase was found. A tetragonality as a function of $KNbO_3$ substitution showed the maximum value at 1.5 mol% $KNbO_3$ and then decreased. The SEM image analysis showed the maximum grain size of $3.14{\mu}m$ at 1.5mol% $KNbO_3$. In the composition ceramics with 1.5 mol% $KNbO_3$ sintered at $1,100^{\circ}C$, excellent properties of density= 4.75 $g/cm^3$, electromechanical coupling factor ($k_p$)= 0.50 and piezoelectric constant($d_{33}$)= 290 pC/N were obtained, respectively, suitable for piezoelectric actuator and energy harvester applications.
朱賢暾,梁承浩 진주여자전문대학 1996 論文集 Vol.19 No.-
Recently it has become particularly to be concerned with low noise emergency generator because generator sets caused noise affecting seriously people in buildings. In this study, I investigated the working of the low noise emergency generator at fire eruption, relation with fire equipment, and changing time from electric power to emergency power. I simultaneously estimated the changing time from electric power to emergency power at emergency.
주현돈,양승호 진주여자전문대학 2002 論文集 Vol.25 No.-
Diesel engine generator sets in heavy industry plants and residential/official buildings can cause serious noise problem. In this paper, a low noise diesel engine generator set is developed through constructing an acoustic enclosure with ventilation duct silencers that effectively block the acoustic flow but guarantee good thermal flow. Acoustic design of the enclosure which is initially layout by rule of thumb, is evolved systematically through numerical reanalysis procedure, based on indirect boundary element method(IBEM) with a commercial acoustic analysis code. The acoustic and cooling performances of the developed low noise diesel engine generator set are confirmed by the experiment.
경계요소법과 유한요소법에 의한 흡음판을 가진 구조물의 소음해석
주현돈,양승호 진주여자전문대학 2001 論文集 Vol.24 No.-
In many practical problems, the use of finite elements to discretize the fluid region leads to large stiffness and mass matrices. But, since the acoustic boundary element discretization requires to put elements only on the surface of structure, the size of matrices is reduced considerably. Here, we developed a numerical analysis program for the structural-acoustic coupling problems of the multi-region cavity, using boundary elements for the fluid regions and finite elements for the structure. By considering sound transmission through layered systems placed in a cavity, the accuracy of the coupled acoustical-structural finite element model has been verified by comparing its transmission loss predictions with analytical sloutions. Example problems are included to investigate the characteristics of the multi-region structural-acoustic coupling system with porous material.