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조봉관(Bong-Kwan Cho),박기준(Ki-Jun Park),임석우(Sok-Woo Lim),차기호(Gi-Ho Cha),오귀진(Kwi-Jin Oh) 대한전기학회 2015 전기학회논문지 P Vol.64 No.3
To achieve the safety and reliability, RAMS activity for a railway signal system of Near Surface Transit is studied. In this paper, preliminary hazard analysis in RAMS activities is studied for the railway signal system of Near Surface Transit. Preliminary hazard analysis is done through automatic train protection, automatic train operation and automatic train supervision. The hazards are defined, then causes and consequence for each hazard are defined. The total 75 preliminary hazards are classified. For high severity hazards are changed to acceptable level by upgrading of system requirement specification.
정공 주입 물질 두께 변화에 따른 유기 발광 다이오우드 효율 향상
김원종(Weon-Jong Kim),이영환(Young-Hwan Lee),차기호(Ki-Ho Cha),이상교(Sang-Kyo Lee),김태완(Tae-Wan Kim),홍진웅(Jin-Woong Hong) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
In the structure of ITO/HIL/Alq₃/Al device, we investigated an efficiency improvement of the Organic Light-Emitting Diodes depending on thickness variation of hole-injection layer. Using the thermal evaporation in a base vacuum 5×10?? [Torr], we have measured efficiency after the Alq₃ was evaporated to 100[㎚] as a deposition rate 1.5 [A/s]. In optimal condition, when PTFE thickness increased from 0 to 3.0[㎚], we have obtained that an optimal thickness of PTFE was 2.5[㎚]. And using the PTFE, luminance efficiency and external quantum efficiency of the device were improved by 12.8 times and 11.1 times, respectively.