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Journal of Convex Analysis 25 (2018), No. 2, [final page numbers not yet available]
Copyright Heldermann Verlag 2018



Identification in Variational and Quasi-Variational Inequalities

Joachim Gwinner
Institute of Mathematics, Department of Aerospace Engineering, Universität der Bundeswehr, Werner-Heisenberg-Weg 39, 85577 Neubiberg - Munich, Germany
joachim.gwinner@unibw.de

Baasansuren Jadamba
Center for Applied and Computational Mathematics, School of Mathematical Sciences, Rochester Institute of Technology, 85 Lomb Memorial Drive, Rochester, NY 14623, U.S.A.
bxjsma@rit.edu

Akhtar A. Khan
Center for Applied and Computational Mathematics, School of Mathematical Sciences, Rochester Institute of Technology, 85 Lomb Memorial Drive, Rochester, NY 14623, U.S.A.
aaksma@rit.edu

Miguel Sama
Dep. de Matemática Aplicada, Universidad Nacional de Educación a Distancia, Calle Juan del Rosal 12, 28040 Madrid, Spain



Our objective is to investigate the inverse problem of identifying variable parameters in certain variational and quasi-variational inequalities. To this end we extend a trilinear form based optimization framework that has been used quite effectively for parameter identification in variational equations emerging from partial differential equations. An abstract nonsmooth regularization approach is developed that encompasses the total variation regularization and permits the identification of discontinuous parameters. We investigate the inverse problem in an optimization setting using the output-least squares formulation. We give existence and convergence results for the optimization problem. We also penalize the variational inequality and arrive at an optimization problem for which the constraint variational inequality is replaced by the penalized equation. For this case, the smoothness of the parameter-to-solution map is studied and convergence analysis and optimality conditions are given. We also discretize the identification problem for quasi-variational inequalities and give the convergence analysis for the discrete problems. Examples are given to justify the theoretical framework.

Keywords: Inverse problems, ill-posed problems, regularization, total variation, parameter identification, output least-squares, variational inequalities, quasi-variational inequalities, penalization, finite elements.

MSC: 49J40, 49N45, 90C26

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