基于心電脈搏信號的睡意檢測方法研究
[Abstract]:As the pace of modern life accelerates, sleep deprivation, poor sleep, and even sleeplessness happen all night. People in the pursuit of efficient life and work, but also by fatigue and sleep harm. In high-risk environments, such as driving, steel and the nuclear industry, people's lives and property are threatened if they are sleepy at work. In some patients, such as obstructive sleep apnea syndrome, real-time sleep monitoring is also necessary. ECG and pulse signals contain abundant physiological information of human body, and the measurement is also relatively simple. In the course of the study, a sleepiness detection experiment was designed and 30 healthy subjects without sleep problems were simultaneously collected ECG signals, pulse signals and EEG signals in awake and sleepy states. In this paper, the electrocardiogram and pulse synchronization signals of 26 selected subjects were preprocessed, and then, by feature extraction and analysis, the significant differences between awake and sleepy state were selected for classification. Compared with awake state, the peak value of ECG T wave in sleeping state, The height of repulse wave and the transmission time of pulse wave decreased significantly (p0.005), the time from the starting point of pulse wave to the peak point of main wave increased significantly (p0.005), and the VLF value of heart rate and heart rate variability decreased significantly (p0.05). Linear discriminant analysis (LDA) and support vector machine (SVM) are used to classify these features into single feature and combined feature respectively. In this paper, in addition to extracting more than 20 characteristics of ECG and pulse signals in time and frequency domain, the wavelet energy spectrum entropy of ECG signal is calculated. The maximum value of ECG RR interval and characteristic K value of pulse wave in the continuous period of sleep deprivation were also analyzed. The results show that sleep affects some characteristics of ECG and pulse signal, the peak value of ECG T wave, the height of repulse wave, the time of pulse wave transmission, the time of starting point of pulse wave to the peak point of main wave, VLF in heart rate and heart rate variability was significantly different between awake and sleepiness states; the combination of features was helpful to improve the classification accuracy; the single feature of ECG T wave peak value and the classification accuracy rate of its involved combination characteristics were higher than those of others. The characteristics of ECG and pulse can be used to distinguish awake and sleepy states, and the measurement of ECG and pulse signals is convenient, which provides a new recognition method for sleepiness detection.
【學位授予單位】:蘭州理工大學
【學位級別】:碩士
【學位授予年份】:2012
【分類號】:R318.0;TN911.7
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