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폴리프로필렌의 Stress-Whitening 현상에 따른 전기적 특성 평가
허지혁(J. H. Heo),정재철(J. C. Jeong),양진영(J. Y. Yang),배민철(M. C. Bae),배건오(K. O. Bae),최석환(S. H. Choi) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
친환경 정책 추진에 따라 (PP: Polypropylene) 절연 케이블이 기존 XLPE 절연 케이블을 대체하고자하는 연구가 진행되고 있다. 본 연구에서는 기존에 고려되었던 굴곡 탄성률의 외부 응력으로 인해 발생되는 백화 현상이 PP 절연 자재의 기계적/전기적 특성에 미치는 영향을 확인하기 위해 인장강도, 유전율, 체적저항, AC, DC 및 Impulse 절연파괴 평가를 수행하였다.
과공정 Al-Si 합금의 미세조직에 미치는 Sc의 영향
정유성,김명한,최석환,Jeong Y. S.,Kim M. H.,Choi S. H. 한국재료학회 2005 한국재료학회지 Vol.15 No.7
Sc has been known to be an very effective ppt-hardening element in Al and Al alloys and also to be effective in modification of eutectic Si in hypoeutectic Al-Si alloys. The modification mechanism of Sc is different from that of the traditional modifier Sr in Al-Si alloys. In the present study the effects of Sc on the primary and eutectic Si in hypereutectic Al-Si alloys were investigated with evaluating the microstructures with OM, EPMA and EBSD methods. The results represent that Sc has only a small effect on primary Si when added less than $0.8wt\%$. However, when Sc addition leading to the precipitation of metallic Sc within primary Si reaches $1.6wt\%$, very coarse primary Si occurs.
볼트 결합부가 있는 구조물의 유한요소 모델링 및 실험적 검증
김진곤(J.G.Kim),김윤영(Y.Y.Kim),최석환(S.H.Choi),김병권(B.K.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
A reliable and practical finite element modelling technique to estimate the behavior of complex structures with bolted joints is important for engineers in the industry. Accordingly, we have examined several simplified modelling techniques which do not require the use of special elements such as a gap element. The dynamic and static experiments have confirmed that the technique to model the bolted joints with solid and rigid elements gives most satisfactory results.<br/>
ADAMS를 이용한 리튬전지 고속 자동 블리스터 포장기의 가상시제품 개발
정상화,이경형,차경래,송석,최석환,신병수 朝鮮大學校 機械技術硏究所 2003 機械技術硏究 Vol.6 No.2
The blister packaging is applied t o many fields in recent years for i t s merit t h a t it enable consumer t o see t h e products The most of battery packaging a r e blister type. However, t h e lithium battery is dealt with very carefully i n packaging because of i t s explosion. The existing packaging machines for lithium battery are mostly adapted alkaline packaging machine and their capacity is very inferior to okher process. either. In this paper, the virtual prototype of the automatic blister packaging system for lithium battery which has new mechanism and 24OEAjmin capacity ' is developed and its performance is evaluated.