<p style='text-indent:20px;'>In this paper, an optimal control model ruled by a class of linear discrete-time stochastic descriptor systems is considered under quadratic index performance. Employing dynamic programming method, recurrence equation to simplify the problem presented provided that are both regular and impulse-free. When objective function quadratic, according equation, linear...

This paper introduces a new approach to the uniform practical stability theory of descriptor systems with infinite time delays in terms of two measurements. An easy-to-test criterion of uniform practical stability is given via Lyapunov functionals and Razumikhin technique. Finally, the application of the results obtained is demonstrated through an analysis of a class of descriptor systems with ...

This paper explores the system of categories that is used to classi­ fy articles in Wikipedia. It is compared to collaborative tagging systems like del.icio.us and to hierarchical classification like the Dewey Decimal Classification (DDC). Specifics and common­ alities of these systems of subject indexing are exposed. Analysis of structural and statistical properties (descriptors per record, re...