We describe work towards articulatory speech synthesis driven by realistic 3D tissue and bone models. The vocal tract shape is modeled using a fast 3D finite element method (FEM) of a muscle-activated human tongue in conjunction with fixed rigid models of jaw, hyoid and palate connected to a deformable mesh representing the airway. Actuation of the tissue model deforms the airway providing a ti...

Edge-based and face-based smoothed finite element methods (ES-FEM FS-FEM, respectively) are modified versions of the method allowing to achieve more accurate results reduce sensitivity mesh distortion, at least for linear elements. These properties make two very attractive. However their implementation in a standard code is non-trivial because it requires heavy extensive modifications architect...

This paper describes an algorithm to extract adaptive and quality 3D meshes directly from volumetric imaging data. The extracted tetrahedral and hexahedral meshes are extensively used in the Finite Element Method (FEM). A top-down octree subdivision coupled with the dual contouring method is used to rapidly extract adaptive 3D finite element meshes with correct topology from volumetric imaging ...

This paper describes an algorithm to extract adaptive and quality 3D meshes directly from volumetric imaging data. The extracted tetrahedral and hexahedral meshes are extensively used in the finite element method (FEM). A top-down octree subdivision coupled with a dual contouring method is used to rapidly extract adaptive 3D finite element meshes with correct topology from volumetric imaging da...

We developed two techniques to address 3D volume parameterization and deformation mapping problems that arise in medical imaging [1]. The first algorithm finds a harmonic map from a 3-manifold to a 3D solid sphere and the second is a novel sphere carving algorithm which calculates the simplicial decomposition of a complex 3D image volume while preserving its surface topology. In this paper, we ...

A new nite element method for elliptic problems with locally periodic microstructure of length " > 0 is developed and analyzed. It is shown that the method converges, as " ! 0, to the solution of the homogenized problem with optimal order in " and exponentially in the number of degrees of freedom independent of " > 0. The computational work of the method is bounded independently of ". Numerical...

BACKGROUND AND OBJECTIVES Partial thickness drainage channels can be created with femtosecond lasers in the translucent sclera for the potential treatment of glaucoma. We present a 3D finite element model (FEM) that can predict the effect of these channels on aqueous humor (AH) outflow and intraocular pressure (IOP). STUDY DESIGN/MATERIALS AND METHODS A 3D model was developed based on a 2D mo...

The solution of elliptic partial differential equations arises in 3D surface reconstruction and active contours. Most current approaches are iterative including finite element methods (FEM) and finite difference methods (FDM). In this paper, we describe a fast spectral method for solving elliptic equations over the unit sphere. A double Fourier series expansion is applied to model convex or sta...

controversy exists regarding cavity preparation for restoration of interproximal caries in posterior teeth in terms of preserving the tooth structure and suitable stress distribution. this study aimed to assess the effect of extension and type of class ii cavities and the remaining tooth structure in maxillary premolars restored with composite resin on the biomechanical properties of teeth usin...

This paper reports a novel methodology and its application to the modeling of a complex 3D geometry on wafer from a layout data. Our modeling method comprises the steps of: drawing a mask layout; transforming the mask layout into a 3D structure by simulating the physical semiconductor process; and extracting device parameters by numerical technique. In order to estimate a 3D structure from the ...