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A vector optimizer, based on population based incremental learning (PBIL) method, is proposed and used to study a hard engineering inverse problem with good results.
The uncertain conductivity value of brain tissue influences the accuracy of the EEG inverse problem solution. When using traditional least-squares minimization methods, the number of electrodes that is used as input in the EEG inverse problem has not an influence on the resolution. However, when including a selection procedure on a high number of electrodes, the localization error is decreased. The...
This paper presents a new technique to reconstruct faulty wiring networks from the time domain reflectometry response. The method is also for characterization of defects in branches on the network. The direct model for wave propagation along the transmission lines is modelled by RLCG circuit parameters and the Finite Difference Time Domain (FDTD) method. Neural Networks (NNs) are used to solve the...
A fast three-dimensional (3D) ground penetrating radar (GPR) forward and inverse scattering method is presented based on the diagonal tensor approximation (DTA). For the forward scattering problem, the first iteration about the frequency-dependent scattering coefficients in the DTA is used. By further evaluating the scattering tensor at the GPR center frequency to remove its frequency dependence,...
Measurement of magnetization M inside a complex ferromagnetic geometry cannot be achieved by usage of any measurement device. In this paper, we propose to use an inverse problem algorithm to determine the law of variation of M for such structures, accounting for the magneto-mechanical effects it is undergoing. The analytical law obtained leads to an intrinsic characterization model of magnetization...
The prior of blocky resistivity profile is formulated based on the minimal of total variation using Bayesian method, and the resistivity distribution is reconstructed by Maximum a posteriori (MAP). The Markov chain Monte Carlo (MCMC) method with Gibbs sampler is used to sample from posterior density. The simulations on the 2D model show the feasibility of the method.
A modified tabu search method for global optimizations of inverse problems is presented. In the proposed algorithm, the whole search procedure is divided into three different phases. Two new point generating mechanisms as well as a dynamic parameters updating rule are proposed to improve the searching efficiency without compromising the solution's accuracy. Numerical results on TEAM Workshop Problem...
An efficient methodology based on Cross Entropy (CE) methods for finding both robust and global optimal solutions of an inverse problem under uncertain conditions is proposed and its merits are validated by numerical experiments.
Topological sensitivity (TS) formulation is derived, for the first time in RF domain, and applied to the hybrid-ON/OFF method for the fast solution of inverse problems. The formulation is based on continuum approach and adjoint variable method. The TS is directly calculated from volume field solutions, and used to determine the ON/OFF status of the unit cell. The proposed method is applied to dielectric...
For the real-time solution of inverse problems as well as for the design optimization of complex power products one strives to obtain a reliable and fast estimation of certain global quantities with as little computational time as possible. Power losses evaluations are the focus of the present contribution. Certainty intervals for the losses are established by means of using A-V and T-Ω dual magneto-quasistatic...
The problem of reconstructing three-dimensional objects buried in layered media is addressed in this paper. A numerical approach which is based on an Estimation of Distribution Algorithm(EDA) is proposed. The reconstruction is obtained from the iterative inversion method that minimizes the cost function by using EDA, where the cost function is defined as the squared magnitude of the difference between...
This paper presents an efficient approach to determining the corrosion currents distributed on the hull of a naval ship, which offer useful information for underwater electric fields prediction and diagnosis of hull corrosion state. To achieve this, a material sensitivity formula, which gives the first-order gradient information of an objective function with respect to the electric current, is analytically...
A field source reconstruction of the dipoles modeling the activated area of the brain while a subject performs the task of the voluntary motion of the hand is solved. Experimental data resulting from the integration of both EEG and fMRI are used.
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