Bio-impedance based vital sign sensor for U-Health application = 유헬스를 위한 바이오 임피던스 기반의 바이탈 신호 센서

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Cardiovascular disease is a general term used to describe disorders that can affect heart and blood vessels systems. Most cardiovascular diseases reflect chronic conditions that develop or persist over a long period of time. In this thesis, vital signs such as heart rate, pulse wave velocity, respiration, body temperature is measured from the electrical properties of human body. Bio-impedance method is a good candidate for the future hand-held health monitoring devices since it is simple, inexpensive and noninvasive. Bio-impedance plethysmography is usually associated with volume changes due to the heartbeats and respiration. Classically, pulse wave velocity and respiration are measured using transducer such as laser, ultrasonic and capacitive sensor that convert signal from mechanical movement to electrical charge flow. In this thesis, respiration measuring methods are presented. Respiration monitoring in everyday life enables the early detection of the disease and disorders that can suddenly manifest in a life threatening episode. Suggested methodology monitor the body volume change in order to capture the respiration rate. In addition, the signal quality is analyzed according to the position of the electrodes to find their optimum position. It is also presented that how much air flows when the respiration occurs as well as respiration rate.To measure the pulse wave velocity low power analog front end is designed. It enables that heart rate and pulse wave velocity can both be monitored using only small body area. The proposed switched current-controlled current source is also low power solution removing static power dissipation. This novel method can increase the efficiency which is ratio of the injected current and dissipation current. The sample and hold circuitry is used as a frequency down converter that has sinc filter property. This method can reduce the capacitor size of the filter and save much power. Body channel communication also adapted to remove...
Cho, Seong-Hwanresearcher조성환
한국과학기술원 : 전기및전자공학과,
Issue Date
568584/325007  / 020095348

학위논문(박사) - 한국과학기술원 : 전기및전자공학과, 2014.2, [ viii, 79 p. ]


bio-impedance; 호흡; 맥파속도; 심박; 바이탈 신호; 바이오 임피던스; vital sign; heart rate; pulase wave velocity; respiration

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