Theoretical and Computational Aspects of Feedback in Structural Systems with Piezoceramic Controllers.- Modeling and Approximation of a Coupled 3-D Structural Acoustics Problem.- Parameter Identification in the Frequency Domain.- On Model Identification of Gaussian Reciprocal Processes from the Eigenstructure of Their Covariances.- An Inverse Problem in Thermal Imaging.- Optimal Fixed-Finite-Dimensional Compensator for Burgers' Equation with Unbounded...