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김정환(Jeong-Hwan Kim),김경섭(Kyeong-Seop Kim),김현태(Hyun-Tae Kim),이정환(Jeong-Whan Lee) 대한전기학회 2013 전기학회논문지 Vol.62 No.6
In this study, Independent Component Analysis (ICA) algorithms are suggested to extract the original ECG part from the mixed signal contaminated with the unwanted frequency components and especially 60㎐ power line disturbances. With this aim, we implement a novel method to suppress the baseline-wandering disturbances and power line artefacts contained in patch-electrodes sensory ECG data by separating the unmixed signal with finding the optimal weight W based on Kurtosis value. With applying brutal force and gradient ascent searching algorithm to find W, we can conclude that the unwanted frequency components especially in the ambulatory ECG data can be eliminated by Independent Component Analysis.
다중레이트 디지털 필터 설계 및 심전도 신호의 기저선 변동 및 전원 잡음 제거
김정환(Jeong-Hwan Kim),김현태(Hyun-Tae Kim),박상은(Sang-Eun Park),이정환(Jeong-Whan Lee),김경섭(Kyeong-Seop Kim) 대한전기학회 2014 전기학회논문지 Vol.63 No.4
Baseline drift reduction and removal of power line noises in electrocardiogram are often necessary to avoid the distortions in extracting the fiducial features. With this aim, the multirate digital filtering algorithm is suggested to design and implement Finite Impulse Response or Infinite Impulse Response Filter by changing the sampling rate with omitting or interpolating intermediate ECG data. After the experimental simulations performed, we can conclude the fact that we can suppress the baseline wander and power line disturbances in ECG signal with reducing the computational complexities in which we do not keep the original and high sampling frequency.
스마트폰 연동 생체신호 왜곡보정을 위한 디지털 필터 설계 및 구현
김정환(Jeong-Hwan Kim),김경섭(Kyeong-Seop Kim),신승원(Seung-Won Shin),김현태(Hyun-Tae Kim),이정환(Jeong-Whan Lee),김동준(Dong-Jun Kim) 대한전기학회 2012 전기학회논문지 Vol.61 No.10
In this study, the novel digital filtering algorithms are implemented to suppress the noisy characteristics embedded in ambulatory electrocardiogram signals by an android smartphone platform. With this aim, Graphical User Interface (GUI) is designed and implemented by utilizing multithread-Java programming to realize Finite Impulse Response and Infinite Impulse Response filter. With simulating our implemented digital filters built in an android smartphone, we can find the fact that we can efficiently suppresses the noisy characteristics due to baseline wandering and 60 ㎐ powerline source fluctuations especially in electrocardiograms.
Microwave Radiometry 원리를 이용한 생체 내부 온도 추정
김경섭,이정환,Kim, Kyeong-Seop,Lee, Jeong-Whan 대한의용생체공학회 2006 의공학회지 Vol.27 No.6
Microwave Radiometry is the spectral measurement of eleclromagnetic radiation at frequency bands in the microwave region. One particular application of Microwave Radiometry is for analyzing temperature difffrentials of inside of human body to detect and diagnose pathologic conditions in which the temperature differentials are related with the symptoms of certain diseases. To accomplish this aim, we propose a new calibration method for estimating subcutaneous temperature by Microwave Radiometer and we also suggest a tumor-imitator phantom structure for simulating heat diffusion propagated by tissues around tumors to evaluate the discernment of brighuless temperature difffrentials.