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이덕규(D.-K Lee),이승찬(S.-C. Lee),김윤제(Y.-J. Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The organic thin film transistors (OTFTs) on a flexible substrate offer many advantages in the fabrication of low-cost sensors, e-paper, smart cards, and flexible displays. In this study, we simulated the electrical heat-generation and heat-transfer characteristics of the OTFT under various drain-voltages and channel lengths from 40㎛ and 90㎛. The characteristics were estimated by the measurement of various drain voltages (VD) at a fixed gate voltage (VG), viz., -40 V. The results showed that the generated maximum temperature in the pentacene channel rose nonlinearly as the drain voltage increased. The results also showed that the channel length did not effect on the electrical heat. The maximum temperature appeared in the side section of the channel between the Au Source/Drain (S/D) electrode and the pentacene layer. As a result, we found that because the top layer in an OTFT features poor chemical union between Au and pentacene, electrical heat was generated at the side section of the pentacene channel.
이승찬(S.-C. Lee),이덕규(D.-K. Lee),설영국(Y.-G. Seol),안종현(J.-H. Kim),이내응(N.-E. Lee),김윤제(Y.-J. Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The Organic Thin Film Transistor (OTFT) on flexible substrate electroplated electrodes has many advantages in the fabrication of low cost sensors, e-paper, smart cards, and flexible displays. In this study, we simulated 3-D OTFT with various voltage conditions by using COMSOL commercial package. Analysis model was limited with channel, gate, source and drain for research of thermal distribution. The channel interval is 40 urn and the voltage ranged between -20 and -40V. The OTFT was fabricated using pentacene as a semiconducting layer and electroplated Ni as a gate electrode. Electric properties of fabricated OTFT were characterized by I-V measurements and heat flux was predicted with the result of thermal distribution.
RCM을 적용한 전동차 유지보수 시스템 개발에 관한 연구
오안섭(A.S. Oh),신국호(K.H. Shin),임병진(B. J. Lim),최용각(Y. K. Choi),신건영(K. Y. Shin),황홍환(H. H. Hwang),이덕규(D. G. Lee) 한국도시철도학회 2014 한국도시철도학회논문집 Vol.2 No.2
It has been developed the reliability management system center of the operator by itself to apply the reliability technique in Seoul Metropolitan Rapid Transit. With analyzing the failure data base on the maintenance system(SMRT-Uffice) developed Since 2000, it obtains various reliable indicators and computerized various reliability techniques. it is to operate the system through the continued expansion. It is essential that training reliability specialists and continuous professional procedure in order to promote the successful reliability management system. We hope that the train to operate safely through the optimization of maintenance and provision of quantitative data generated by operating a system that is based on RCM with collection and analysis Data to run a train maintenance work is generated.