This paper will review some fundamental results in the understanding of several basic
problems concerning feedback and uncertainty. First, we will consider adaptive control of …

Feedback is ubiquitous and is a basic concept in the area of control, where it is used
primarily for reducing internal or external uncertainties, or both. In this note, we will study the …

We consider a class of linear dynamical systems containing uncertain elements and subject
to uncertain inputs, and for which either uncertain state or output is available. We construct a …

We expose a fundamental limitation of the self-tuning procedure for adaptive control of linear
stochastic systems. Specifically, if the cost criterion measuring the performance of the …

This paper is concerned with the problem of designing a stabilizing controller for a class of
uncertain dynamical systems. The vector of uncertain parameters q(⋅) is time-varying, and …

We consider linear dynamical systems containing uncertain elements owing to imperfect
knowledge about the model, the input and, sometimes, the state as well. Subject to these …

In this paper, we will study the stability problem by output feedback of a class of uncertain
control systems, whose nominal part is linear and whose uncertain part is norm-bounded by …

The control of uncertain nonlinear systems is a topic that continues to challenge control
theoreticians. This topic is also of practical importance since many real-world systems …

In this paper we consider the systems described by dx=Axdt+Budt+σ_iF_ixdβ_ior\qquaḋx=
Ax+Bu+B_iF_i(x,t)C_ix, and we will derive conditions under which there exists a feedback …

This paper describes some of my research in the analysis and control of nonlinear uncertain
systems in which the uncertainties are modeled deterministically rather than stochastically …