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4 전극법을 이용한 BIA측정에서의 신장 측정 기술 방법에 대한 연구
반윤호,박찬원 강원대학교 정보통신연구소 2005 정보통신논문지 Vol.9 No.-
In this paper, to estimate a man's height information from body impedance and weight informations, the 4-electrode BIA (Bioelectrical Impedance Analysis) method are used. When it induces minute constant current having [500KHz, 1MHz, 2MHz] frequency to body, impedance values from voltage signals measured via body are calculated. By using the measured impedance and the weight, we had tried to guess the his real height. As a result, if the man's body impedance value and the changing width by frequency is similar, we found that their BMI(Body Mass Index) is proportional to their weight. But the number of samples are too little to formalize this relationship. So, in this paper, we proposed the equation to calculate the height with the man's impedance at the frequency of 21㎒ and his weight. The suggested equation's maximum error in calculate the real height is ranged at ±11cm, and the probability of the error that is ranged at ±5cm is 83.3%.
박찬원,반윤호 강원대학교 정보통신연구소 2004 정보통신논문지 Vol.8 No.-
In this paper, a method of a signal conditioning process of the smart sensor which covers signal conditioning hardware and signal processing software is suggested. It also includes a method of reducing the offset voltage and the drift error from the A/D conversion hardware using analog signal switching technique with specific operational amplifier circuits. We have designed a hardware filter and a software digital filter with Auto Zero Tracking algorithm for better signal process of the proposed smart sensor module. Software technique was performed to obtain stable data from the sensor interface. As a result of OUT experimental works, the proposed system is expected to be used in the industrial field where a high precision sensing measurement is required.
박찬원,이민섭,반윤호 江原大學校 産業技術硏究所 2005 産業技術硏究 Vol.25 No.A
In precision instrumentation system, an A/D conversion of signal conditioning has some problems.; offset and drift errors with environmental situation. This paper suggested a development of the Multi-Channel A/D Data Acquisition System and a method of the evaluation and the temperature compensation for the A/D converters with the specific analog and digital circuit including the software. Also, we have designed a hardware and a software filters with smart algorithm for better signal processing of the proposed system. Software approach was adopted to obtain the stable data from A/D converter. As shown in our experimental works, the proposed system is expected to be used in the industrial field where a high precision measurement is required.