Geometric active contours (GACs) and surfaces (GASs) implemented via level set techniques enjoy many advantages over parametric active contours (PACs) and surfaces (PASs), such as computational stability and the ability to change topology during deformation. While many capabilities of earlier PACs and PASs have been reproduced by various GACs and GASs, and while relationships have been discusse...

Severe postoperative cystoid macular edema associated with posterior uveitis, commonly referred to as Irvine-Gass syndrome, may occur after intraocular surgery and result in visual loss. There is little consensus on the efficacy of various topical, peribulbar, retrobulbar, or intravitreal therapeutic options compared to natural history, but patients with this condition are often referred to ret...

A formalism is presented in which quantum particle dynamics can be developed on its own rather than ‘quantization’ of an underlying classical theory. It is proposed that the unification of probability and dynamics should be considered as the basic feature of quantum theory. Arguments are given to show that when such a unification is attempted at the configuration space level, the wave funtions ...

It has been suggested that MMPI-2 scoring requires removal of some items when assessing patients after a traumatic brain injury (TBI). Gass (1991. MMPI-2 interpretation and closed head injury: A correction factor. Psychological assessment, 3, 27-31) proposed a correction procedure in line with the hypothesis that MMPI-2 endorsement may be affected by symptoms of TBI. This study assessed the val...

The most characteristic ocular lesions in pseudoxanthoma elasticum are the angioid streaks which may be seen in about 85 per cent. of cases. The associated features in the fundus are a peculiar mottled appearance (Shimizu, I96I), peau d'orange (Smith, Gass, and Justice, I964), and yellowish-white spots (salmon spots). While most subjects showing angioid streaks have pseudoxanthoma elasticum, cl...

Introduction In reaction to what they considered the prevailing bias of second language acquisition (SLA) research towards cognitive-oriented theories, Firth and Wagner (1997) called for a greater recognition of the social context and interactive nature of language use. Without negating the importance of cognitive dimensions of learning, the authors noted that ―language is acquired and learned ...