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We propose new approaches to ray tracing that greatly reduce the required number of operations while strictly preserving the geometrical correctness of the solution. A hierarchical "beam" structure serves as a proxy for a collection of rays. It is tested against a kd-tree representing the overall scene in order to discard from consideration the sub-set of… (More)
We present a study of the system implications of various aspects of the classic Ray Tracing algorithm. We show how these algorithms can be modified to yield the highest performance on any given system, and present some of the results that we obtained.
Inside you'll find the following articles: Smarter computer technologies can rapidly and transparently analyze large complex datasets and explore different outcomes, and ultimately help people do what they want to do more easily. RMS (recognition, mining and synthesis) is the term used by Intel to describe this class of emerging applications. This issue of… (More)
OBJECTIVE To determine whether synchronized nasal intermittent positive pressure ventilation (SNIPPV) would decrease extubation failure compared with nasal continuous positive airway pressure (NCPAP) in preterm infants being ventilated for respiratory distress syndrome (RDS). METHODS Infants who were </=34 weeks' gestational age and who were ventilated… (More)
BACKGROUND Dysphagia secondary to carcinoma of the oesophagus and gastric cardia is the principal symptom requiring palliation in those patients who present with late-stage disease or who are unfit for surgery. The primary aim of the present study was to determine the safety and efficacy of laser photocoagulation in the palliation of malignant dysphagia.… (More)
Liposome loading with Gd via the membrane-incorporated polychelating amphiphilic polymers (PAPs) significantly increases the Gd content and relaxivity (T1 parameter) of PEGylated liposomes, which can be used as contrast agents for magnetic resonance imaging (MRI). Here, we demonstrate that such Gd-containing liposomes can be additionally modified with the… (More)
The objective of this study was to identify the most efficient and cost-effective nebulizer device for delivery of albuterol aerosol as a bronchodilator in ventilated preterm infants. Bronchodilators are frequently used as part of the therapeutic regimen of ventilated preterm infants. This can be delivered by different types of nebulizers like the Jet or… (More)