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수면단계 뇌파 검출을 위한 Fourier 와 Wavelet해석
서희돈,김민수,Seo Hee-Don,Kim Min-Soo 대한의용생체공학회 2003 의공학회지 Vol.24 No.6
수면뇌파의 해석에 있어서 수면단계는 뇌파의 특성파 검출에 특히 중요하다. 수면단계는 여러 수면질환의 진단에 가장 기초적일 단서를 제공한다. 본 연구에서 수면뇌파 신호를 이산 웨이브렛 변환 뿐 만 아니라 퓨우리에 변환, 연속 웨이브렛 변환을 이용해서 해석하였다. 제안된 시스템 방범인 퓨우리에와 웨이브렛은 수면뇌파의 중요한 특성파(유파, 수면방추파, K복합, 구파 REM) 검출을 위해서 수면상태를 분석했다. 수면뇌파 분석에는 Daubechies 웨이브렛 변환 방법과 고속 퓨우리에를 이용했다. 모의실험결과 신경망 시스템이 특성 파형의 분류에 높은 성능을 발휘함을 알 수 있었다. The sleep stages provides the most basic evidence for diagnosing a variety of sleep diseases. for staging sleep by analysis of EEG(electroencephalogram), it is especially important to detect the characteristic waveforms from EEG. In this paper, sleep EEG signals were analyzed using Fourier transform and continuous wavelet transform as well as discrete wavelet transform. Proposeed system methods. Fourier and wavelet for detecting of important characteristic waves(hump, sleep spindles. K-complex, hill wave, ripple wave) in sleep EEG. Sleep EEG data were analysed using Daubechies wavelet transform method and FFT method. As a result of simulation, we suggest that our neural network system attain high performance in classification of characteristic waves.
서희돈,이윤희,박종대,최세곤 ( Hee Don Seo,Youn Hee Lee,Jong Dae Park,Se Gon Choi ) 한국센서학회 1993 센서학회지 Vol.2 No.1
Capacitive pressure sensor for low pressure measurements has been fabricated by using n^+ epitaxial layer electrochemical etching stop and glass-to-silicon electrostatic bonding technique. The sensor had hybrid configuration of a sensor chip, which consists of sensor capacitor and reference capacitor, and two output signal detection IC chips. A fabricated sensor, with a 1.0X1.0 ㎟ square size and a 10 pm thick flat diaphragm, showed a 7.1 pF zero pressure capacitance, and 5.2 % F. S. sensitivity in 10 KPa pressure range. By using a capacitance to voltage converter, the thermal zero shift of 0.051 % F. S. and the thermal sensitivity shift of 0.12 % F. S. C for temperature range of 5∼45℃ were obtained.
전용 CMOS IC 에 의한 다중 생체 텔레미트리 시스템 제작
최세곤,서희돈,박종대,김재문 ( Se Gon Choi,Hee Don Seo,Jong Dae Park,Jae Mun Kim ) 한국센서학회 1996 센서학회지 Vol.5 No.1
This paper presents a manufacture of the multiple subjects biotelemetry system using custom CMOS IC fabricated 1.5,um n-well process technology. The implantable circuits of the system except sensor interface circuits including FM transmitter are fabricated on a single chip with the size of 4 x q mm. It is possible to assemble the implantable system in a hybrid package as small as 3 x 3 x 2.5cm by using this chip. It`s main function is to enable continuous measurement simultaneously up to 7-channel physiological signals from the selected one among 8 subjects. Another features of this system are to enable continuous measurement of physiological signals, and to accomplish ON/OFF switching of an implanted battery by subject selection signal with command signal from the external circuit. If this system is coupled with another appropriate sensors in medical field, various physiological parameters such as pressure, pH and temperature are to be measured effectively in the near future.