We perform collision detection between static rigid objects using a bounding volume hierarchy which consists of an oriented bounding box (OBB) tree enhanced with bounding spheres. This approach combines the compactness of OBBs and the simplicity of spheres. The majority of distant objects are separated using the simpler sphere tests. The remaining objects are in close proximity, where some sepa...

Objective: The present research aimed to examine positive and negative beliefs about worry and tendency of students to drug abuse in terms of cross-level effect of school-bounding. Methods: In this multi-level investigation, 1000 students of high schools were selected by means of multi-stage sampling technique. Then, they completed metacognitive questionnaire (MCQ), school-bound...

A technique for bounding the capacities of networks of independent channels is introduced. Parts I and II treat pointto-point and multiterminal channels, respectively. Bounds are derived using a new tool called a bounding model. Channel 1 is an upper (lower) bounding model for channel 2 if replacing channel 2 by channel 1 in any network yields a new network whose capacity region is a superset (...

Principal component analysis (PCA) is commonly used to compute a bounding box of a point set in R. The popularity of this heuristic lies in its speed, easy implementation and in the fact that usually, PCA bounding boxes quite well approximate the minimumvolume bounding boxes. We present examples of discrete points sets in the plane, showing that the worst case ratio of the volume of the PCA bou...