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지상탱크의 부식감지를 위한 음향방출시험에서 발생한 전자기간섭신호의 특성 연구
김승대,정우광,Kim, Sung-Dai,Jung, Woo-Gwang 한국재료학회 2007 한국재료학회지 Vol.17 No.5
The evaluation and comparison have been made for the EMI noise which was included in the signal from the sensors in the acoustic emission testing for the bottom plate of ground tank at full. The EMI signal has been classified into two types. One is the signal with very short AE count, and this signal possibly can be filtered by front end filter setting of the channel count with low level of 4 and high level of $10^8$. The other EMI signal occurred from CH 1, CH 3 and CH 10, and had high and constant duration with high energy and count (maximun duration > $10^5\;{\mu}s$), and has characteristic gradient of accumulation amplitude distribution. This signal should be removed in the AE signal evaluation by filtering, because this may affect to the total gradient.
나노 구체 리소그라피법에 Ashing과 Annealing 효과를 적용하여 크기조절 가능한 나노패턴의 제조
이유림,마흐붑 알람,김진열,정우광,김승대,Lee, Yu-Rim,Alam, Mahbub,Kim, Jin-Yeol,Jung, Woo-Gwang,Kim, Sung-Dai 한국재료학회 2010 한국재료학회지 Vol.20 No.10
This work presents a fabrication procedure to make large-area, size-tunable, periodically different shape metal arrays using nanosphere lithography (NSL) combined with ashing and annealing. A polystyrene (PS, 580 ${\mu}m$) monolayer, which was used as a mask, was obtained with a mixed solution of PS in methanol by multi-step spin coating. The mask morphology was changed by oxygen RIE (Reactive Ion Etching) ashing and temperature processing by microwave heating. The Au or Pt deposition resulted in size tunable nano patterns with different morphologies such as hole and dots. These processes allow outstanding control of the size and morphology of the particles. Various sizes of hole patterns were obtained by reducing the size of the PS sphere through the ashing process, and by increasing the size of the PS sphere through annealing treatment, which resulted in tcontrolling the size of the metallic nanoparticles from 30 nm to 230 nm.
적외선 열화상 장비를 이용한 실시간 변압기 진단 및 평가
이철구(Chul-Ku Lee),백원갑(Won-Gab Baek),김승대(Sung-Dai Kim) 한국생산제조학회 2012 한국생산제조학회지 Vol.21 No.4
It was diagnosed customer transformers and other equipment by using non-contact infrared equipment. Examiners can identify not only abnormalities in real time in the field of the transformer immediately, as well as they were able to safely perform the scan. Thanks to successful transformer diagnosis, we can easily diagnose abnormalities of transformer itself which can be caused by deterioration of the oil used as overlaod or refrigerant and we can also diagnose abnomalities from low voltage bushing which can be result by external environmental factors and physical factors and abnomalities from its connections at the same time we found it is very useful at proactive diagnostics.