http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
정영식(Young-Sik Chung),방선배(Sun-Bae Bang),김동욱(Dong-Wook Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
It is identified that conventional circuit protecting device is unable to break a circuit in the situation when arc faults occur and arc faults can not be found easily. The shoulder is one of main characteristics of arc signal. The paper shows how the shoulder of arc current obtained from a washing machine can be detected. by using wavelet analysis. The simulation results showed that this method can effectively detected the shoulder of arc current
웨이브렛 변환을 이용한 직렬 아크고장의 shoulder 검출에 관한 연구
정영식(Young-Sik Chung),방선배(Sun-Bae Bang),김동욱(Dong-Wook Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
Many waveform characteristics of arc signal support the detection of hazardous arc faults. The shoulder is one of main characteristics of arc signal. This paper provide a method for the detection of shoulder from series arc fault based on discrete wavelet transform. The simulation results show that the proposed method is reliable and simple.
정영식(Young-Sik Chung),김철(Cheol Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.11
The choice of threshold is an important in the compression algorithms. It plays a major role in the removal of coefficients which are not preserved the important features. In this paper two threshold method, hard threshold(HTH) and soft threshold(STH) are applied to the suggested wavelet based compression algorithm of power quality signal and compared the compression ratio and NMSE. The simulation results show that STH is bettern than HTH.
정영식(Young-Sik Chung),김철(Cheol Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Data storage and data communication currently pose a major problems for all parties involved with power quality and power system monitoring. The problem aries from the tremendous amount of data involved. There is a common desire in the power industry to find new techniques for high-accuracy data compression and data storage. This paper introduces a data compression technique that is very suitable for application to power quality waveforms. The proposed technique is applied in splitting the monitored signal into two components. Those are stationary and nonstationary components. Each component is compressed and encoded.