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The accurate estimation of sleep stages can be used to diagnose the health condition. The conventional sleep stage estimation method, i.e., the R&K method requires expensive equipment such as polygraph machine, as well as being invasive. This paper describes a novel method to estimate the sleep stages by a using non-invasive air mattress applicable to home use. The proposed sleep stage estimation...
The authors have been studying the control mechanism of the fetal heart rate using a spectral analysis method which has high accuracy and a short calculation time. They have shown by simulation that frequency components of heart rate variability can be obtained more accurately even if the heart rate data contained certain errors in measurement. They report here the result obtained by applying a similar...
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