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This paper is concerned with the question of how to online combine an ensemble of active learners so as to expedite the learning progress during a pool-based active learning session. We develop a powerful active learning master algorithm, based a known competitive algorithm for the multi-armed bandit problem and a novel semi-supervised performance(More)
The identification and modeling of dynamical systems in a practical situation, where the model set under consideration does not necessarily include the observed system, are treated. A measure of the relevant information in a sequence of observations is shown to possess useful properties, such as the metric property on the parameter set. It is then shown(More)
An estimate of the probability density function of a random vector is obtained by maximizing the output entropy of a feedforward network of sigmoidal units with respect to the input weights. Classification problems can be solved by selecting the class associated with the maximal estimated density. Newton's optimization method, applied to the estimated(More)
This paper examines the application of virtual reality cues, generating the biofeed-back effects of a real tiled floor, reported in [8], for gait improvement in Parkinson's Disease (PD) patients. A portable apparatus, comprising head and body-mounted 3-axis accelero-meters, a wearable computer and see-through head-mounted display, creates a virtual tiled(More)
OBJECTIVE To study the effects of visual cues, provided through a portable visual-feedback virtual reality (VR) apparatus, on the walking abilities of patients with multiple sclerosis (MS). METHODS On-line (display-on) and residual short-term therapeutic effects on walking speed and stride length were measured in 16 randomly selected patients with gait(More)
It is shown that a tiled floor provides continuous stabilizing visual information against stumbling and falling while walking. A steady walk, eyes at a nearly constant height, maintains a certain level of net optical flow in a tile's image. A stumble generates a disturbance in the net flow, which is fed back as a corrective signal to the limbs. This may(More)