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신명진(Myoung-Jin Shin),김철수(Chul-Su Kim),최덕호(Deuck-Ho Choi),박민흥(Min-Heung Park),김정규(Jung-Kyu Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The high-speed train(KTX) was operated in domestic since 2004 and 5 years have been passed since then. At the beginning most of the KTX component maintenance period was followed by the France SNCF. It was settled by the Replacement interval. But the environment and operation condition are different from each other(Geographical difference(climate, rainfall, etc), many station than france and existing railway length than exclusive railway length), so the Replacement interval maintenance period can be different in some component. Therefore new Replacement interval is necessary based on our own circumstances. This paper introduces failure analysis case on Single Braking Display to set Replacement interval in domestic. KTX-RCM(Reliability Centered Maintenance System) Data was investigated.
백색 LED의 특성에 대한 ZnS:Mn, Dy 황색 형광체의 영향
신덕진,유일,Shin, Deuck-Jin,Yu, Il 한국재료학회 2011 한국재료학회지 Vol.21 No.6
ZnS:Mn, Dy yellow phosphors for White Light Emitting Diode were synthesized by a solid state reaction method using ZnS, $MnSO_4{\cdot}5H_2O$, S and $DyCl_3{\cdot}6H_2O$ powders as starting materials. The mixed powder was sintered at $1000^{\circ}C$ for 4 h in an air atmosphere. The photoluminescence of the ZnS:Mn, Dy phosphors showed spectra extending from 480 to 700 nm, peaking at 580 nm. The photoluminescence of 580 nm in the ZnS:Mn, Dy phosphors was associated with $^4T_1{\rightarrow}^6A_1$ transition of $Mn^{2+}$ ions. The highest photoluminescence intensity of the ZnS:Mn, Dy phosphors under 450 nm excitation was observed at 4 mol% Dy doping. The enhanced photoluminescence intensity of the ZnS:Mn, Dy phosphors was explained by energy transfer from $Dy^{3+}$ to $Mn^{2+}$. The CIE coordinate of the 4 mol% Dy doped ZnS:Mn, Dy was X = 0.5221, Y = 0.4763. The optimum mixing conditions for White Light Emitting Diode was obtained at the ratio of epoxy : yellow phosphor = 1:2 form CIE coordinate.
볼밀시간에 의한 WO<sub>3</sub>:In<sub>2</sub>O<sub>3</sub> 가스센서의 감응특성
신덕진,유윤식,박성현,유일,Shin, Deuck-Jin,Yu, Yun-Sik,Park, Sung-Hyun,Yu, Il 한국재료학회 2011 한국재료학회지 Vol.21 No.6
[ $WO_3$ ]powders were ball-milled with an alumina ball for 0-72 hours. $In_2O_3$ doped $WO_3$ was prepared by soaking ball-milled $WO_3$ in an $InCl_3$ solution. The mixed powder was annealed at $700^{\circ}C$ for 30 min in an air atmosphere. A paste for screen-printing the thick film was prepared by mixing the $WO_3$:In2O3 powders with ${\alpha}$-terpinol and glycerol. $In_2O_3$ doped $WO_3$ thick films were fabricated into a gas sensor by a screen-printing method on alumina substrates. The structural properties of the $WO_3$:$InO_3$ thick films were a monoclinic phase with a (002) dominant orientation. The particle size of the $WO_3$:$InO_3$ decreased with the ball-milling time. The sensing characteristics of the $In_2O_3$ doped $WO_3$ were investigated by measuring the electrical resistance of each sensor in the test-box. The highest sensitivity to 5 ppm $CH_4$ gas and 5 ppm $CH_3CH_2CH_3$ gas was observed in the ball-milled $WO_3$:$InO_3$ gas sensors at 48 hours. The response time of $WO_3$:$In_2O_3$ gas sensors was 7 seconds and recovery time was 9 seconds for the methane gas.
CuO가 첨가된 WO<sub>3</sub>-SnO<sub>2</sub> 후막 가스센서 특성 연구
이돈규,신덕진,유일,Lee, Don-Kyu,Shin, Deuck-Jin,Yu, Il 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.12
CuO doped $WO_3-SnO_2$ thick film gas sensors were fabricated by screen printing method on alumina substrates and heat-treated at $350^{\circ}C$ in air. The effects of mixing ratio of $WO_3$ with $SnO_2$ on the structural and morphological properties of $WO_3-SnO_2$ were investigated X-ray diffraction and Scanning Electron Microscope. The structural properties of the $WO_3-SnO_2$:CuO thick film by XRD showed that the monoclinic of $WO_3$ and the tetragonal of $SnO_2$ phase were mixed. Nano CuO was coated on the $WO_3-SnO_2$ surface and then the surface of $WO_3$ was coated with $SnO_2$ particles with $1\sim1.5{\mu}m$ in diameters, as confirmed form the SEM image. The sensitivity of the $WO_3-SnO_2$:CuO sensor to 2000 ppm $CO_2$ gas and 50 ppm $H_2S$ gas for the various ratio of $WO_3$ and $SnO_2$ was investigated. The 4 wt% CuO doped $WO_3-SnO_2$(75:25) tkick films showed the highest sensitivity to $CO_2$ gas and $H_2S$ gas.