Knowledge of the surface geometry of an imaging subject is important in many applications. This information can be obtained via a number of different techniques, including time of flight imaging, photogrammetry, and fringe projection profilometry. Existing systems may have restrictions on instrument geometry, require expensive optics, or require moving parts in order to image the full surface o...

OBJECTIVE We sought to validate a sequence of ultrasonographic mesh measurements to determine the relevant time points in the postoperative monitoring of mesh size. METHODS Mesh was measured preoperatively ex vivo, prior to insertion, in 25 patients scheduled to undergo vaginal repair of cystocele involving insertion of a Ugytex™ transobturating polypropylene mesh. A 2D/3D perineal ultrasound...

Adaptive mesh methods are valuable tools in improving the accuracy and efficiency of the numerical solution of evolutionary systems of partial differential equations. If the mesh moves to track fronts and large gradients in the solution, then larger time steps can be taken than if it were to remain stationary. We derive explicit differential equations for moving the mesh so that the time variat...

Moving mesh methods based on the equidistribution principle (EP) are studied from the viewpoint of stability of the moving mesh system of differential equations. For fine spatial grids, the moving mesh system inherits the stability of the original discretized partial differential equation (PDE). Unfortunately, for some PDEs the moving mesh methods require so many spatial grid points that they n...

Hele-Shaw flows with time-dependent gaps create fingering patterns, and magnetic fluids in Hele–Shaw cells intriguing patterns. We propose a simple numerical method for type problems by the of fundamental solutions. The solutions is one mesh-free solvers potential problems, which provides highly accurate approximate solution despite its simplicity. Moreover, satisfies volume-preserving property...

A necessary and sufficient condition is given for all hyperbolic difference schemes that use up to nine mesh points to be of second-order accuracy. We also construct a new difference scheme for two-dimensional hyperbolic systems of conservation laws. The scheme is of second-order accuracy and requires knowledge of only seven mesh points. A stability condition is obtained and is utilized in nume...

This paper describes the development of a prototype system using fuzzy logic concept for constructing a feature human model, which is to be stored in a 3D digital human model database. In our approach, the feature human model is constructed by unorganized cloud points obtained from 3D laser scanners. Firstly, noisy points are removed, and the orientation of the human model is adjusted; secondly...

The optical behaviour of the human eye is often characterized with the Zernike coefficients. Great number of measurements and statistical data are available for individuals and for various groups of people concerning the Zernike coefficients of their eyes. Although, these coefficients were obtained from measurements at discrete points and via computations using some discretization of the contin...

The increased popularity and the growth in the number of deployed IEEE 802.11 Access Points (APs) have raised the opportunity to merge together various disjointed wireless LANs to form a unique wireless mesh network (WMN). In this architecture only few nodes, called Portals (MPPs), interface to the external world thanks to their bridging/gateway functions, while several Mesh Points (MPs) form a...