Variance Reduction Methods in Stochastic Homogenization December 7, 2011 3:00 p.m. Frederic Legoll Abstract In this talk, we will describe various methods, among which variance reduction strategies, to make random homogenization more affordable from the practical viewpoint. In the framework of stochastic homogenization, the homogenized matrix is defined from the so-called corrector function that solves […]
Computer Model Calibration with High and Low Fidelity Model Output for Spatio-Temporal Data March 8, 2012 3:45 p.m. William Kleiber Abstract We discuss a framework for computer model calibration based on high and low fidelity model output for large spatio-temporal datasets. The physical model in use is a coupled magnetohydrodynamic-ionospheric model for solar storms occurring […]
Sparsity Constraint in Electrical Impedance Tomography: Complete Electrode Model March 30, 2012 12:00 p.m. Matthias Gehre Abstract We investigate the potential of sparsity constraints in the electrical impedance tomography (EIT) inverse problem of inferring the distributed conductivity based on boundary potential measurements. We consider the complete electrode model, which is more sophisticated than the Neumann-to-Dirichlet […]
Optimal Design, Resonance and Bandgap Formation in Goupillaud-type Elastic Media April 24, 2012 11:30 a.m. Dr. George Gazonas ABSTRACT This talk will present the derivation of exact analytical optimal design solutions that minimize the amplitude of transient stress waves in Goupillaud-type layered elastic media [1]. The method of characteristics is used to derive a system […]
Implicit-explicit Runge-Kutta Methods with Stabilized Finite Elements for Advection-diffusion Equations February 21,2012 3:30 p.m. Alexandre Ern Abstract We analyze a two-stage implicit-explicit Runge–Kutta scheme for time discretization of advection–diffusion equations. Space discretization uses continuous, piecewise affine finite elements with interelement gradient jump penalty; discontinuous Galerkin methods can be considered as well. The advective and stabilization […]