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정상상태 시각 유발전위를 이용한 뇌전도 측정 시스템과 능동형 건식 전극 개발
임채영,홍혁기,김영환 한국정보통신설비학회 2015 한국정보통신설비학회 학술대회 Vol.2015 No.08
In this paper, we attempted in preparing high precision EEG signal measuring equipment. separation amplifier is essential to eliminate common line noise. So, our study were pointed at elevating the efficiency of eliminating noise, user safety and low noise characteristics. And converted data were Fast Fourier Transformed(FFT) with real time DSP (Digital Signal Processing). Steady-State Visually Evoked Potentials (SSVEP) are natural response signal associated with the visual stimuli with specific frequency. By using SSVEP, occipital lobe region is electrically activated as frequency form equivalent to stimuli frequency with bandwidth from 3.5Hz to 75Hz. In this paper, we propose an experimental paradigm for analyzing EEGs based on the properties of SSVEP. At first, an experiment is performed to extract frequency feature of EEGs that is measured from the image-based visual stimuli associated with specific objective with affordance. From the results, we can conclude that the developed active dry-electrode shows comparative performance to traditional Ag/AgCl electrodes. When considering the additional advantages of the developed electrodes, such as the convenience of use and ease of application to EEG measurement the developed electrode shows enormous potential as a replacement for the standard electrode for EEG monitoring in various ambulatory and hospital settings.
피부 광학 기반의 새로운 생체 인증 기술을 위한 1차원 MSP 모듈 Prototype 개발
김해나(Hae-Na Kim),홍혁기(Hyuck-Ki Hong),최연식(Yeon-Shik Choi),조영창(Young-Chang Jo),김동현(Dong-Hyun Kim) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
This paper investigates the possibility of MSP(Multi-spectral Skin Photometrics) as a novel biometric technology to facilitate automatic identification of individuals. MSP using transmission and diffuse reflection difference with variable wavelength provides information about both the surface and subsurface characteristics of the skin tissue. It is found in this paper that 8 people have their unique patterns each other under the same wavelength. Personal difference of skin tissue components concentration and anatomical characteristics measured by multi spectral light offers possibility of MSP as more enhanced biometric technology.