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25.8㎸급 친환경 고체절연차단기(Solid Insulated Switchgear)에 대한 기계적 신뢰성(수명) 평가
이도훈(Do-Hoon Lee),이석원(Seog-Won Lee),박석원(Seok-Weon Park),김영근(Young-Geun Kim),이종호(Jhong-Ho Lee) 대한전기학회 2010 전기학회논문지 P Vol.59 No.2
In this paper, mechanical reliability(Life-time) estimation method for 25.8kV SIS(Solid Insulated Switchgear) has been studied. Recently enacted KEPCO's standard includes clause that have to submit a warrantable reliability data for life-time(over B10 25 years) of an epoxy-solid insulating material. Accordingly, this research was carried out on the ALT(Accelerated Life Test) and Life-Estimation method for SIS's insulating material. Mechanical life-time estimation for SIS's insulating material is to verify reliability for tensile creep & fatigue stress, which is the major mechanical stress of SIS. This study proved that SIS's reliability for mechanical stress and established that confidence for estimation results in further verification test.
윤중락,정태석,최근묵,이석원,Yoon, Jung-Rag,Jeong, Tae-Seok,Choi, Keun-Mook,Lee, Seok-Weon 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.6
In order to enhance sintering characteristics on the $ZnO-Pr_6O_{11}$ based multilayer chip varistors (MLVs), a response surface analysis using central composite design method were carried out. As a result, varistor voltage($V_{1mA}$), nonlinear coefficient ($\alpha$), leakage current ($I_L$) and capacitance (C) were considered to be mainly affected by sintered temperature and holding time. MLVs sintered at $1200^{\circ}C$ and above $1200^{\circ}C$ revealed poor electrical characteristics, possibly due to the reaction between electrode materials(Pd) and $ZnO-Pr_6O_{11}$ based ceramics. On the sintering temperature range $1150{\sim}1175^{\circ}C$, nonlinear coefficient ($\alpha$) and leakage current ($I_L$) were shown to be $60{\sim}69$ and below $0.3{\mu}A$, respectively. In particular, MLVs sintered at $1175^{\circ}C$, 1.5 hr and $2^{\circ}C/hr$ (cooling speed) showed stable ESD(Electrical Static Discharge) characteristics under the condition of 10 times at 8 Kv with deviation varistor voltage, and deviation nonlinear coefficient were 0.3% and 0.33% (at positive), 0.55% (at negative), respectively.
원재환(Chaehwan Won),이상호(Sangho Lee),이석원(Seok Weon Lee) 한국산업경영학회 2014 경영연구 Vol.29 No.2
본 연구의 목적은 재무분야에서 아직 명쾌하게 해결하지 못한 문제 중 하나인 폐쇄형뮤추얼펀드 퍼즐을 옵션가격결정모형을 통해 이론적으로 설명하고자 하는 것이다. 폐쇄형펀드 퍼즐이란 펀드가격이 펀드의 순자산가치보다 낮거나(할인) 높게(할증) 시장에서 형성되는 현상을 말하는 것으로 효율적시장가설(EMH)에 대한 반증으로 널리 인용되고 있다. 본 연구에서의 분석결과, 폐쇄형펀드의 할증이나 할인과 같은 이상현상은 효율적 시장에서도 존재할 수 있음을 이론적으로 확인하였는바, 할증과 할인을 풋옵션가치로 설명 할 수 있기 때문이다. 본 연구는 주로 이론적 고찰에 중점을 두며, 민감도분석을 통 해 중요한 시사점들을 도출한다. The purpose of this study is to theoretically explain the 'Closed-end mutual fund (CEF) puzzle' which is one of the unsolved issues in finance area. The CEF puzzle is the phenomenon that the fund is priced lower or higher than the net asset value(NAV) of the fund in the market, and it is frequently cited as a counter example of efficient market hypothesis(EMH). According to our analysis, both premiums and discounts on closed-end mutual fund can exist even in the context of efficient markets since both premium and discount can be specified as the values of put options. In this paper, we focus primarily on the theoretical nature of premiums on closed-end mutual funds. Some useful implications are then provided through sensitivity analyses. for studying the temporal behavior of the premiums or discounts.