David Ojeda

• PhD
• Professor at Universidad Técnica del Norte

In the 3D printer market, there are several types of printing; among those found in the middle are fused filament deposition printing and stereolithography. In stereolithography, layers of resin are solidified employing UV rays. Each manufacturer offers different types of resins that react to light exposure. These usually have very general values i...

The elastic analysis of a dynamic compression plate (DCP) used for the forearm bone fracture reduction is presented. For this propose is employed a tool based on the Boundary Element Method (BEM) and an iterative domain decomposition technique with which is possible to develop 3D models and non-homogeneous materials. The numerical results obtained...

A control proposal for a finger rehabilitator is presented. It is part of a multidisciplinary research project at the Technical University of the North (Ecuador) whose purpose is the production of medical devices. The creation of an automatic device that assists the physiotherapist in the hand?s rehabilitation could allow the attention of many pati...

Mediante este documento se hace referencia a un proyecto de investigación en el área médica y fisioterapéutica, enmarcada en tratamientos para recuperación de la movilidad funcional de los dedos de la mano que se han generado por traumatismo ocasionados en accidentes de tránsito, de trabajo o problemas neurológicos y congénitos. El diseño de este r...

In the Andeans, it is common to find homemade containers, chairs, structures made with Schoenoplectus californicus sub. californicus, commonly known as totora. Popularly is known that the homemade products possess resistance and durability due to the incorporation of this fiber, although nowadays the mechanic properties of this material are unknown...

El Gobierno ecuatoriano establece, en 2013, políticas basadas en doce objetivos en aras de fortalecer el desarrollo socio-económico de la Nación; para ello, la ha dividido en 9 zonas según sus características productivas. Por tal motivo, el Consejo de Educación Superior solicita a las Universidades el rediseño de sus ofertas académicas para solvent...

This The cognitive-behavioral psychological approach is a schematic model in crisis, associated with catastrophes, extended by its effectiveness in the world; but only practiced in the Ecuadorian private doctor's offices. Currently, the emergency brief therapy as tool for crisis interventions, is used; because that is ideal for areas associated wit...

The Surface Electromyography (SEMG) is a technique used for many applications in different areas such as: Neurology, Rehabilitation, Orthopedics, Ergonomics, Sports, etc. [15]. In the last years, this technique has led to great research, and several groups of researchers throughout the world have made inroads in the field of the electromyography ap...

The design of a Dynamic Compression Plate (DCP) used for the forearm bone fracture reduction is presented. For this propose, the stress distribution on the plate is evaluated for various load conditions, such as compression, bending, and torsion, using a tool based on the Finite Element Method (FEM), specifically ABAQUS version 6.8. The results obt...

The following study is intended to develop the design of an external fixator for the wrist used in treatment of distal radius fractures in adults. To implement the design was evaluated the external fixation device, Schanz screws and bone, together. The loading was applied to second metacarpal and distal region displacements were restricted. The str...

A plate for internal fixation of distal radius fractures is presented. A stresses numerical evaluation under different loads is made. The finite element method, through the ANSYS V.11 program, has been used. The implant geometry was modeled to generate a complete system with the plate, bone and screws. The contour conditions were applied using exte...

The boundary element method (BEM) requires only a surface mesh to solve thermoelasticity problems, however, the resulting matrix is fully populated and non-diagonally dominant. Solution of non-homogeneous media by BEM is also problematic due to the lack of a general non-homogeneous fundamental solution. BEM solution of large-scale problems also pos...

An efficient solution of the inverse geometric problem for cavity detection using a point load superposition technique in the elastostatics boundary element method (BEM) is presented in this article. A superposition of point load clusters technique is used to simulate the presence of cavities. This technique offers tremendous advantages in reducing...

An efficient solution for cavity detection in cortical bone, using a point load superposition technique employing the boundary element method is presented in this paper. Two examples where the cavity is located using a TAC is presented. Results of cavity presence problems simulated using numerical experiments validate the approach in cortical bone...

An efficient solution for cavity detection in cortical bone, using a point load superposition technique employing the boundary element method is presented in this paper. Two examples where the cavity is located using a TAC is presented. Results of cavity presence problems simulated using numerical experiments validate the approach in cortical bone...

A method for the efficient solution of the inverse geometric problem for cavity detection using a point load superposition technique in the elastostatics boundary element method (BEM) is presented in this paper. The superposition of point load clusters to simulate the presence of cavities offers tremendous advantages in reducing the computational t...

An efficient singular superposition technique in elastostatics boundary element methods for cavity detection using a point load is presented in this paper. The superposition of several concentrated loads to simulate the presence of cavities leads to a significant reduction of the computational time in the elastostatics field solution with the bound...

An effective and efficient methodology for the fatigue cracks growth evaluation in human cortical bone is presented. The solution is based on the elastic linear fracture mechanics. For the evaluation of cracked boundary the dual boundary element method is used. The solution is based on the development and application of a computational algorithm to...

A method for the efficient solution of the inverse optimization problem of cavity detection using a point load superposition technique in elastostatics boundary element methods is presented in this paper. The superposition of point load clusters to simulate the presence of cavities offers a tremendous advantage in reducing the computational tine in...