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고주파 신호에 의하여 변형된 저주파신호에서의 특성변수 추정 기법
유경열,Yoo, Kyung-Yul 대한전기학회 2002 전기학회논문지 D Vol.51 No.2
An estimation method for the characteristic parameters in the low frequency signal is proposed in this paper. A low frequency signal is assumed to be modulated or distorted by high frequency terms. The algorithm proposed in this paper is designed to select set of local maximums in a successive manner, hence it is denoted as the iterative peak picking(IPP) algorithm. The IPP algorithm is operating in the time domain and is using only the comparison operation between two neighboring samples. Therefore, its computational complexity is very low and the delay caused by the computation is negligible, which make the real-time operation possible with economic hardware. The proposed algorithm is verified on the pitch estimation of speech signal and blood pulse estimation.
고성능액체크로마토그래피-유도결합플라즈마 질량분석기를 이용한 어류 중 메틸수은 분석법 확립
유경열 ( Kyung Yoal Yoo ),반경녀 ( Kyeong Nyeo Bahn ),김은정 ( Eun Jung Kim ),김양선 ( Yang Sun Kim ),명정은 ( Jyong Eun Myung ),윤혜성 ( Hae Seong Yoon ),김미혜 ( Mee Hye Kim ) 한국환경농학회 2011 한국환경농학회지 Vol.30 No.3
BACKGROUND: Methylmercury is analyzed by HPLC-ICP/MS because of the simplicity for sample preparation and interference. However, most of the pre-treatment methods for methylmercury need a further pH adjustment of the extracted solution and removal of organic matter for HPLC. The purpose of this study was to establish a rapid and accurate analytical method for determination of methylmercury in fish by using HPLC-ICP/MS. METHOD AND RESULTS: We conducted an experiment for pre-treatment and instrument conditions and analytical method verification. Pre-treatment condition was established with aqueous 1% L-cysteine·HCl and heated at 60℃ in microwave for 20 min. Methylmercury in 50 μL of filtered extract was separated by a C18 column and aqueous 0.1% L-cysteine·HCl + 0.1% L-cysteine mobile phase at 25℃. The presence of cysteine in mobile phase and sample solution was essential to eliminate adsorption, peak tailing and memory effect problems. Correlation coefficient(r2) for the linearity was 0.9998. The limits of detection and quantitation for this method were 0.15 and 0.45 μg/kg respectively. CONCLUSION: Result for analytical method verification, accuracy and repeatability of the analytes were in good agreement with the certified reference materials values of methylmercury at a 95% confidence level. The advantage of the established method is that the extracted solution can be directly injected into the HPLC column without additional processes and the memory effect of mercury in the ICP-MS can be eliminated.