In this paper, we propose a conjugate gradient algorithm for identifying a space-dependent diffusioncoefficient in a time-fractional diffusion equation from the boundary Cauchy data in one-dimensional case. The exist...
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In this paper, we propose a conjugate gradient algorithm for identifying a space-dependent diffusioncoefficient in a time-fractional diffusion equation from the boundary Cauchy data in one-dimensional case. The existence and uniqueness of the solution for a weak form of the direct problem are obtained. The identification of diffusioncoefficient is formulated into a variational problem by the Tikhonov-type regularization. The existence, stability and convergence of a minimizer for the variational problem approach to the exact diffusioncoefficient are provided. We use a conjugate gradient method to solve the variational problem based on the deductions of a sensitive problem and an adjoint problem. We test three numerical examples and show the effectiveness of the proposed method. (C) 2018 International Association for Mathematics and Computers in Simulation (IMACS). Published by Elsevier B.V. All rights reserved.
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