The analysis and control of time-delay systems has gained increasing interest in the last
decades due to the effectiveness of delay differential equations (DDEs) in modeling a wide …

This paper is concerned with the observer design problem for a class of multi-input–multi-
output nonlinear systems with the unmodeled dynamics, unknown parameters and external …

For the purpose to estimate the state of nonlinear continuous-time systems, we focus on the
increasing-gain observer regarded as generalization of the well-known high-gain observer …

The design of observers for nonlinear systems with unknown, time-varying, bounded delays,
on both state and input, still constitutes an open problem. In this technical note, we show …

Causal and non-causal observability are discussed in this technical note for nonlinear time-
delay systems with unknown inputs. Using the theory of non-commutative rings and the …

In this work, an observer for a linear time-varying system with delayed measurements is
developed. The delay is assumed to be unknown, bounded, and it can be time-varying with …

The use of connected devices or humans-in-the-loop for measuring outputs of dynamical
systems inevitably produces time-varying measurement delays. These delays can lead to …

We present a robust H∞ observer for a class of nonlinear discrete‐time systems. The class
under study includes an unknown time‐varying delay limited by upper and lower bounds, as …

A full-order state observer for a class of nonlinear continuous-time systems is presented as
generalization of the high-gain observer for having a time-varying gain that is let to be small …

This paper suggests a new method to design observers in a class of nonlinear time‐delay
systems with delays in system states. The method is based on an extension of the well …