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정현권,이희영 전남대학교 전자통신기술연구소 2001 전자통신기술논문지 Vol.4 No.1
Elecrocardiogram(ECG) signals are nonstationary processs in nature. To remove noise in ECG signals, Time-frequency analysis techniques are suitable tools since they represent signals simultaneously in both time and frequency. In this paper, A variable bandwidth filter (VBF) is proposed for cleaning ECG signals with known instantaneous bandwidth (IB). Also, the behaviors and the characteristics of the VBF are examined in time-frequency domain (TFD). The proposed VBF clips a noisy signal along the boundaries of IB and rejects noise in the outside of the IB of the signal in TFD. It possible to construct four kinds of VBF that are low-pass VBF, high-pass VBF, band-pass VBF and band-stop VBF.
지능형 주거 공간을 위한 24시간 연속적인 건강 모니터링 시스템 구현
오승환,이희영 전남대학교 전자통신기술연구소 2001 전자통신기술논문지 Vol.4 No.1
This paper presents a wireless potable telemetry healthcare monitoring system with the characteristics of small size (42mmx75mmx15mm) and low power consumption (90mw) for the elderly and the disabled. The healthcare system consists of a measurement device, a diagnosis S/W and a user interface S/W. The measurement device is designed according to the international specifications of the recommendation of AAMI (Association for the Advancement of Medical Instrumentation). The measurement device has the functions that adjust gain and cut-off frequency to acquire various bio-signals such as ECG, EMG and EEG. It has wireless communication using Bluetooth to send a data between a host computer and other device.