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정전 용량성 결합 전극을 이용한 웨어러블 심전도 측정 시스템 설계에 관한 연구
이재호(Jae-Ho Lee),이영재(Young-Jae Lee),이강휘(Kang-Hwi Lee),강승진(Seng-Jin Kang),김경남(Kyeung-Nam Kim),박희정(Hee-Jung Park),이정환(Jeong-Whan Lee) 대한전기학회 2014 전기학회논문지 Vol.63 No.10
In this study, a new type of electrode device is implemented to measure the capacitance energy and interpret it as the ECG (Electrocardiogram) data. The main idea of this new electrode system is to estimate the capacitance on the skin by assembling a capacitive-coupled circuits and translate into the ECG signal. To measure the coupling energy and estimate the aquired data in terms of heart activity, the capacitive-coupled electrode is garmented with fabrics in the form of a chest band or a vest jacket. To compare the ECG data from the capacitive-coupled electrode with the conventional electrode(Ag-AgCl) system, the corelation coefficient between two signals is computed as 0.9517. Thus, we can conclude the fact that capacitive-coupled electrode system can measure a person"s heart activity without any contact to his or her skin and can the interpreted as the ECG data
이중 커프 오실로메트릭법을 이용한 비침습 동맥압 측정시스템의 설계
이필재(Pil-Jae Lee),이영재(Young-Jae Lee),김동준(Dong-Jun Kim),이재호(Jae-Ho Lee),임민규(Min-Gyu Lim),이정환(Jeong-Whan Lee) 대한전기학회 2012 전기학회논문지 Vol.61 No.6
In this study, a new blood pressure measuring system was proposed and implemented. An additional small-cuff was placed on the center of a inner cuff to measure morphological signals and new oscillometric ratio. The proposed BP-measuring system is composed of an external cuff, an inner cuff and a small-cuff. Oscillation signal from small-cuff is interpolated with 7th-order fitting polynomials and SBP, DBP ratio were 22.2% and 87.7%. Experimental data were gathered from 20 volunteers (25±4 years) and arterial blood pressure values were compared with auscultation, sphygmomanometers, small-cuff and inner-cuff. As a result, the difference in systolic BP between auscultation and the small-cuff was 1.93(±1.28) mmHg, and the inner-cuff was 4.53(±4.39) mmHg, and sphygmomanometer was 6.68(±3.99) mmHg, and the corresponding difference in diastolic BP was 2.50(±2.04) mmHg, 3.50(±3.19) mmHg, 7.35(±5.62), respectively.