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진수봉,Joon S. Lee,Yoon S. Choi,최인식,한전건,M. Hori 한국물리학회 2013 Current Applied Physics Vol.13 No.5
Amorphous silicon oxycarbonitride thin films were synthesized on polyethylene terephthalate (PET)substrates at low temperatures (w80 C) by plasma-enhanced chemical vapor deposition (PECVD). A high ion flux and suitable nitrogen flow rate improved the gas barrier properties and deposition rate of the resulting a-SiOxCyNz film. The a-SiOxCyNz films were deposited at a high deposition rate and low water WVTR properties as a result of the high ion flux and nitrogen chemistry. The high ion flux modified the chemical structure and nitrogen atomic composition of the resulting a-SiOxCyNz film coatings. The substrate temperature was characterized using a thermometer. In addition, the coating properties were characterized by Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS) and the water vapor transmission rate (WVTR).
진수봉,Wen Long,B. B. Sahu,한전건,M. Hori 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.9
Silicon-oxide thin films were deposited on polyethylene-terephthalate (PET) and glass substrates for applications in transparent barrier packaging and replacement display cover glasses by using plasma-enhanced chemical vapor deposition (PECVD). The bias conditions and the input power in the radio-frequency plasma were changed to optimize the gas barrier and the mechanical properties of the silicon-oxide thin film. We made an advanced plasma source for large-area PECVD (370 × 470 mm2 size). The dissociation of the octamethylycyclodisiloxane (OMCTS) precursor was controlled by using the plasma processing parameters. The gas barrier and the mechanical properties of the a-SiOx film were improved by controlling the plasma process parameters. The gas barrier and the mechanical properties of the coatings were examined using a Permatran (MOCON) system and a pencil hardness measurement. The chemical structure properties of the coatings were examined by using Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The properties of the a-SiOx thin films were improved by the dissociation of OMCTS obtained by using various appropriate plasma processing parameters.
진수봉(S.B. Jin),최정균(J.K. Choi),맹성용(S.Y. Meing),이상용(S.Y. Lee) 한국도시철도학회 2016 한국도시철도학회논문집 Vol.4 No.2
서울도시철도 5~8호선 신호시스템은 무절연 궤도회로인 AF궤도회로를 사용하고 있다. 이는 사람의 귀로 들을 수 있는 16~20,000[Hz] 대 가청주파수를 사용한다. AF궤도회로는 열차검지기능은 물론 선, 후행 열차운행간격, 운행에 적합한 열차 지시속도, 차량운행정보 등을 열차에 송신하여 안전운행을 가능하게 해주는 여러가지 장점 때문에 차상신호방식에 적합한 장치이다. 그러나 열차 주행 중 순간적으로 지상-차상신호 시스템간 속도코드가 송수신되지 않으면(이하 순간무신호) 순간제동 등 열차 충격이 발생하여 이용승객에 불편을 주게 된다. 본 논문에서는 AF궤도회로에서의 순간무신호 발생원인과 운영 및 유지보수 측면에서 개선방법을 제시하였다. The signaling system of SMRT 5~8 lines uses a AF track circuit that is a non-insulated track circuit. The system utilizes the audible frequency between 16 and 20,000[Hz], which could be heard by human beings. AF track circuit is suitable for cab signal due to various advantages that make trains operate safely, such as train detection function, the interval of operation between preceding and following train, the appropriate command speed for trains operation and the operation information of trains etc. However, passengers will have uncomfortable feeling by train impacts like instant brake, if there is temporarily no transmission and reception of speed code between wayside signal system and onboard signal system in running. This paper is shown the cause of the momentary NO SIGNAL at AF track circuit and presented the efficient improvement in terms of operation and maintenance.