Sleep Staging Using Noncontact-Measured Vital Signs.

As a physiological phenomenon, sleep takes up approximately 30% of human life and significantly affects people's quality of life. To assess the quality of night sleep, polysomnography (PSG) has been recognized as the gold standard for sleep staging. The drawbacks of such a clinical device, however, are obvious, since PSG limits the patient's mobility during the night, which is inconvenient for in-home monitoring.

[Novel type of unperturbed sleep monitoring scheme under pillow based on hidden Markov model].

Sleep status is an important indicator to evaluate the health status of human beings. In this paper, we proposed a novel type of unperturbed sleep monitoring system under pillow to identify the pattern change of heart rate variability (HRV) through obtained RR interval signal, and to calculate the corresponding sleep stages combined with hidden Markov model (HMM) under the no-perception condition. In order to solve the existing problems of sleep staging based on HMM, ensemble empirical mode decomposition (EEMD) was proposed to eliminate the error caused by the individual differences in HRV and then to calculate the corresponding sleep stages.

Carbon quantum dots decorated MoSe photocatalyst for Cr(VI) reduction in the UV-vis-NIR photon energy range.

Developing whole spectrum responsive photocatalysts is one of greatly significant subjects from the viewpoint of using solar energy. Here we have firstly developed a carbon quantum dots-decorated MoSe photocatalyst that is active in the whole spectrum of solar light for Cr(VI) reduction. The Cr(VI) reduction rate of higher than 99% has been achieved with 1wt.