A model following control system (MFCS) can output general signals following the desired ones. In this paper, a method of nonlinear MFCS will be extended to be a nonlinear descriptor system in discrete time. The nonlinear system studied in this paper has the property of norm constraint $\left|\right|f\left(v\left(k\right)\right)\left|\right|\le \alpha +{\beta \left|\right|v\left(k\right)\left|\right|}^{\gamma }$, where $\alpha \ge 0$, $\beta \ge 0$ , $0\le \gamma <1$. In this case, a new criterion is proposed to ensure the internal states be stable.

La información cuadrática es una buena alternativa a la información de Shannon para todos aquellos problemas que, por su naturaleza, interesa tratarlos con una utilidad no local. El objetivo de este trabajo es dar, para estas situaciones, un método secuencial de construcción de diseños para discriminación entre modelos, basado en la maximización de la información cuadrática.Después de una introducción, donde se resumen los conceptos y resultados principales sobre información cuadrática, se plantea...

In this paper we consider D-optimal and highly D-efficient chemical balance weighing designs. The errors are assumed to be equally non-negatively correlated and to have equal variances. Some necessary and sufficient conditions under which a design is D*-optimal design (regular D-optimal design) are proved. It is also shown that in many cases D*-optimal design does not exist. In many of those cases the designs constructed by Masaro and Wong (2008) and some new designs are shown to be highly D-efficient....

In this paper we consider a class of incomplete block designs in which every block is two dimensional. Thus heterogeneity is removed not only between blocks, but also in two directions within each block. Such designs have been considered before in Srivastava (1977,1978). Here, we consider the class of cyclic designs of this type when the number of treatments ν is an odd number between 5 and 25, and present designs that are D-optimal within this class.