OBJECTIVE In a device based on midsagittal jaw movements analysis, we assessed a sleep-wake automatic detector as an objective method to measure sleep in healthy adults by comparison with wrist actigraphy against polysomnography (PSG). METHODS Simultaneous and synchronized in-lab PSG, wrist actigraphy and jaw movements were carried out in 38 healthy participants. Epoch by epoch analysis was r...

Experimental observation of a permanent reflectional symmetry breaking (RSB) is reported for a laminar three-dimensional wake. Based on flow visualizations, a first bifurcation from the trivial steady symmetric state to a steady RSB state is characterized at Re=340. The RSB state becomes unsteady after a second bifurcation at Re=410. It is found that this RSB regime is persistent at large Reyno...

Genetic determinants may contribute to the large variability in arterial blood pressure responses to changes in sleep/wake state in humans. In this study, we developed techniques to examine the relationship between sleep/wake state and mean arterial pressure (MAP) in unrestrained, genetically identical mice (C57BL/6J; n = 9). The left common carotid artery was catheterized, and arterial blood g...

Purpose: The purpose of this study was to validate the Actiwatch with behaviorally determined sleepe wake state in preterm infants and to explore the influence of postmenstrual age on the accuracy of Actiwatch. Methods: A prospective and comparative research design was used. Twenty-four preterm infants with postmenstrual age ranging from 28e38 weeks were studied. The infants were studied for 2 ...

background: premature birth is a major cause of infant mortality in developed countries. newborns confined to neonatal intensive care units (nicus) are in a rapid stage of brain development. as such, sleep plays a pivotal role in the proper brain development of newborns. however, this developmental aspect is often disregarded due to the lack of information. aim: this study aimed to evaluate the...

Animals continuously alternate between sleep and wake states throughout their life. The daily organization of sleep and wakefulness is orchestrated by circadian, homeostatic, and motivational processes. Over the last decades, much progress has been made toward determining the neuronal populations involved in sleep/wake regulation. Here, we will discuss how the application of advanced in vivo to...

J.C. Sandberg1; Y. Ge2; H.T. Nguyen1; T.A. Arcury1; A.J. Johnson3; W. Hwang4; H.D. Gage3; T. Reynolds5; J.J. Carr3 1 Department of Family and Community Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA; 2 Department of Biomedical Engineering, Wake Forest School of Medicine, Winston-Salem, NC, USA; 3Department of Radiology, Wake Forest School of Medicine, Winston-Salem, NC, USA; 4...

A new algorithm for ship wake detection is developed with the aim of ship heading and velocity estimation. It exploits the Radon transform and utilizes merit indexes in the intensity domain to validate the detected linear features as real components of the ship wake. Finally, ship velocity is estimated by state-of-the-art techniques of azimuth shift and Kelvin arm wavelength. The algorithm is a...

The aim of this study was to examine the validity of activity-based monitoring (actigraphy) for the assessment of sleep-wake patterns during the 1st year of life. Forty-one infants were directly observed for sleep-wake state determination by trained observers. Concomitant activity data obtained by actigraphs attached to the infants’ ankles during the observation were matched on a minute-by-minu...

We consider the problem of quickest detection of an intrusion using a sensor network, keeping only a minimal number of sensors active. By using a minimal number of sensor devices, we ensure that the energy expenditure for sensing, computation and communication is minimized (and the lifetime of the network is maximized). We model the intrusion detection (or change detection) problem as a Markov ...