identification

Identification of Properties of Inhomogeneous Plate in the Framework of the Timoshenko Model

Authors: Bogachev I. V., Vatulyan A. O., Dudarev V. V., Lapina P. A., Nedin R. D.

We consider an inverse problem on identification of properties of an inhomogeneous circular plate for the Timoshenko model. The identification procedure is based on the analysis of acoustical response at some point of the plate in the given set of frequencies. The vibrations are caused by a uniformly distributed load applied to the upper face of the plate. We have derived the oscillation equations for a symmetric circular plate and formulated the boundary conditions in the dimensionless form.

Automata on algebraic structures

Authors: Skobelev V. V.

A survey of results obtained in investigations of automata determined over finite algebraic structures. The objects of research are automata over some finite ring, automata determined in terms of ideals, automata over varieties, and families of hash-functions determined by automata without output function. Computational security, complexity of simulation and homomorphisms of investigated automata are characterized.