We introduce a new interpretation for the biometric enrollment and identification paradigms and show how the problem of multiple hypothesis testing (HT) for arbitrarily varying sources (AVS) in a special case relates to it. The traditional studies on biometric systems from communication perspectives assume the noisy channel model. If suppose that the process of the biometric data enrollment for...

A new technique for the imaging of flow territories of individual extra- and intracranial arteries is presented. The method is based on balanced pseudocontinuous arterial spin labeling but employs additional time-varying gradients in between the radiofrequency pulses of the long labeling train. The direction of the additional gradient vector is perpendicular to the selected artery and its azimu...

A central notion in the study of texture segregation is that of feature gradient (or feature contrast). In orientation-based texture segregation, orientation gradients have indeed played a fundamental role in explaining behavioral results. Here, however, we show that general, smoothly varying, orientation-defined textures (ODTs) exhibit striking perceptual singularities that are completely unpr...

When the image is affected by strong noise and uneven intensity, traditional active contour models often cannot obtain accurate results. In this paper, a novel adaptive fractional differential segmentation method proposed to solve above problem. At first, in order extract more texture parts of image, an adaptively matrix constructed according gradient information varying each pixel. Then, edge-...

Abstraet--Discretized population balances of aggregating systems are known to consistently over-predict number densities for the largest particles. This over-prediction has been attributed recently by the authors (Kumar and Ramkrishna, 1996, Chem. En#ng Sci. 51, 1311-1332) to steeply non-linear gradients in the number density when a fixed pivotal particle size is used for each discrete interval...

Field emitters rely on high gradients on microfabricated structures to enable substantial levels of emitted current, which can in turn act to reduce the field at the emission site of a single emitter. An account of that effect is obtained in the following steps: a model of the emitter geometry based on the point charge model that allows for the determination of the apex radius and field enhance...