Rafael Gallego

Learn More
In this paper the most suitable algorithms for unconstrained optimization now available applied to an identi®cation inverse problem in elasticity using the boundary element method (BEM) are compared. Advantage is taken of the analytical derivative of the whole integral equation of the BEM with respect to the variation of the geometry, direct(More)
The purpose of this communication is to present a novel approach to compute the so called Topological Sensitivity (TS) of any variable or functional in elasticity using Boundary Integral Equations (BIE's), and its use as a tool for identification of defects, by itself or in conjunction with zero-order methods, like Genetic Algorithms. The TS of a cost(More)
We argue that symmetries and conservation laws greatly restrict the form of the terms entering the long wavelength description of growth models exhibiting anomalous roughening. This is exploited to show by dynamic renormalization group arguments that intrinsic anomalous roughening cannot occur in local growth models. However, some conserved dynamics may(More)
The alternating iterative algorithm proposed by Kozlov et al. [An iterative method for solving the Cauchy problem for elliptic equations. USSR Comput Math Math Phys 1991;31:45–52] for obtaining approximate solutions to the Cauchy problem in two-dimensional anisotropic elasticity is analysed and numerically implemented using the boundary element method(More)
In this paper a new error estimator based on tangential derivative Boundary Integral Equation residuals for 2D Laplace and Helmholtz equations is shown. The direct problem for general mixed boundary conditions is solved using standard and hypersingular boundary integral equations. The exact solution is broken down into two parts: the approximated solution(More)
In this paper the solution of some inverse problems for potential ®elds is tackled. The aim is to compute the position and shape of an unknown ¯aw within a body, using some experimental measures as additional data. By the linearization of the di€erence between the Boundary Integral Equation for the actual con®guration and the same equation for an assumed(More)
Our work focuses on semi-blind equalization techniques when applied to GMSK-based mobile communication systems. Starting from the works developed in (F. Alberge et al, SPAWC'99), a new semi-blind block algorithm is proposed to provide reliable communication through a typical mobile multi-path channel. The algorithm is shown to have performance similar to(More)
In many inverse and optimization problems, the computation of the gradient of the response—displacements and tractions—at the boundary of specimens due to a variation of the geometry is needed. Since finite difference techniques are error prone due to the difference parameter and are computationally expensive, a formulation to compute this gradient by(More)