Brian J. Thelen

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We develop and investigate several novel multiresolution algorithms for detecting coherent radar targets embedded in clutter. These multiresolution detectors exploit the fact that prominent target scatterers interfere in a characteristic manner as resolution is changed, while multiresolution clutter signatures are random. We show, both on simulated and(More)
BACKGROUND While hamstring strain injuries are common during sprinting, the mechanisms of injury are not well understood. In this study, we analyzed the running kinematics of an athlete obtained at the time of an acute hamstring strain injury. The purpose was to identify the period of the gait cycle during which the hamstring was likely injured, as well as(More)
where x and u may be one-, two-, or three-dimensional coordinates and f(x) may be complex valued or nonnegative real valued, depending on the application. Reconstruction of the object f(x) from IF(U)I is equivalent to reconstruction of the Fourier phase A(u) from jF(u)I (hence the name phase retrieval), and reconstruction from IF(u)I is equivalent to(More)
STUDY OBJECTIVES Analysis of sleep dynamics--distributions of contiguous sleep and sleep stage durations--reveal exponential distributions and potential clinical utility in adults. We sought to examine these polysomnographic variables for the first time in children, and in the context of childhood sleep disordered breathing (SDB). DESIGN AND SETTING(More)
BACKGROUND A study of the impacts on respiratory health of the 2007 wildland fires in and around San Diego County, California is presented. This study helps to address the impact of fire emissions on human health by modeling the exposure potential of proximate populations to atmospheric particulate matter (PM) from vegetation fires. Currently, there is no(More)
STUDY OBJECTIVES In sleep-disordered breathing (SDB), visual or computerized analysis of electroencephalogram (EEG) signals shows that disruption of sleep architecture occurs in association with apneas and hypopneas. We developed a new signal analysis algorithm to investigate whether brief changes in cortical activity can also occur with individual(More)
STUDY OBJECTIVES To explore newly-identified respiratory cycle-related electroencephalographic changes (RCREC), which may represent microarousals, as correlates of neurobehavioral outcomes in children with sleep-disordered breathing (SDB). DESIGN Retrospective. SETTING University sleep laboratory. PARTICIPANTS Ten research subjects, aged 6 to 10(More)
OBJECTIVE We evaluated the utility of amplitude-integrated EEG (aEEG) and regional oxygen saturation (rSO2) measured using near-infrared spectroscopy (NIRS) for short-term outcome prediction in neonates with hypoxic ischemic encephalopathy (HIE) treated with therapeutic hypothermia. METHODS Neonates with HIE were monitored with dual-channel aEEG,(More)
In this paper, we describe a model-based, non-linear reconstruction method for mapping internal building structures using through-wall radar data. We based the model on canonical geometry constructs that are commonly used in construction practices. These constructs are then formulated as sets of simple scattering mechanisms, which can be estimated from the(More)
We apply a Wald sequential hypothesis test to Synthetic Aperture M a r (SAR) phase history data. A 2D Autoregressive (AR) signal model is applied to the SAR phase history data to exploit the signatures produced by cultural objects. We model the sequential probability ratio decision statistic as a Brownian motion process with drift. The test can then be(More)