We examine the feasibility of designing an accelerometer-based (or gyroscope-free) inertial navigation system that uses only accelerometers to compute the linear and angular motions of a rigid body. The accelerometer output equation is derived to relate the linear and angular motions of a rigid body relative to a fixed inertial frame. A sufficient condition is given to determine if a configurat...

Secondary infall in galaxies could cause the angular momentum of the outer halo to change its orientation. The generation of warps due to this effect is studied using N-body simulations.

Perceptual accuracy is unnecessary for the control of action. For purposes of motor control, sensitivity is more important than accuracy: Systematic (i.e., stable) bias can be corrected for by calibration; variance cannot. Our experiments show that there is a systematic perceptual (i.e., in phenomenology) expansion of angular perceptual variables, such as surface orientation and gaze declinatio...

The aim of this study was to analyse the effects of cranial base orientation on the morphology of the craniofacial system in human populations. Three geographically distant populations from Europe (72), Africa (48) and Asia (24) were chosen. Five angular and two linear variables from the cranial base component and six angular and six linear variables from the facial component based on two refer...

q-Ball imaging is a high-angular-resolution diffusion imaging technique that has been proven very successful in resolving multiple intravoxel fiber orientations in MR images. The standard computation of the orientation distribution function (the probability of diffusion in a given direction) from q-ball data uses linear radial projection, neglecting the change in the volume element along each d...

Many palmprint authentication approaches have been proposed in recent years. Among them, the orientation based coding approach, in which the dominant orientation features of palmprints are extracted and encoded into bitwise codes, is one of the most promising approaches. The distance between codes created from two palmprint images is calculated in the matching stage. Reliable orientation featur...

While many computer vision algorithms can be used to determine surface orientation information, most require extensive processing (e.g. texture based method). In this paper we demonstrate that under xation, the ratio of angular disparity measures and knowledge of eye position can be used to obtain an estimate of surface orientation. A sensitivity analysis based on accuracy of eye position contr...

OBJECTIVE To assess the factors, including helmet use, that contribute to head linear and angular acceleration in bicycle crash simulation tests. METHOD A series of laboratory tests was undertaken using an oblique impact rig. The impact rig included a drop assembly with a Hybrid III head and neck. The head struck a horizontally moving striker plate. Head linear and angular acceleration and st...