Teleoperation systems are subject to different types of disturbances. Such disturbances, when unaccounted for, may cause poor performance and even instability of the teleoperation system. This paper presents a novel nonlinear bilateral control scheme using the concept of disturbance observer based control for nonlinear teleoperation systems. Lumping the effects of dynamic uncertainties and exte...

Lotka-Volterra population biology models are important models that describe the interaction between various biological species considered as predator-prey system. This work describes a Lotka-Volterra population biology model with negative feedback. We show that for this biological model, the predator and prey species have stable coexistence. Then we shall propose ecological monitoring of the po...

The current demand for more complex models has initiated a shift away from statespace models towards models described by both dynamic and algebraic equations, so-called implicit systems. These models arise as the natural product of real processes. In this paper, we consider design of observers for a class of implicit systems. The proposed observer combines the dynamic Newton-Raphson algorithm a...

This paper is concerned with the design of a controller-observer scheme for the exponential stabilization of a class of singularly perturbed nonlinear systems. The controller design uses a sliding mode technique and is divided in two phases: slow feedback control and fast feedback control so that a final composite control is obtained. Assuming that only the fast state is available and the syste...

A solution to the problem of global exponential tracking without velocity measurement of mechanical systems with friction and possibly unbounded inertia matrix is given in the paper. The proposed controller is obtained combining a new full–information passivity–based controller with a new immersion and invariance observer. The resulting closed–loop system has, in some suitably defined coordinat...

This article presents an observer-based event-triggered boundary control strategy for a class of reaction–diffusion partial differential equations with Robin actuation. The observer only requires measurements. approach consists backstepping output feedback controller, derived using estimated states, and dynamic triggering condition, which determines the time instants at input needs to be update...

This letter proposes a novel robust interval observer for two-dimensional (treated as synonym double-indexed system) linear time-invariant discrete-time system described by the Fornasini-Marchesini second model. is subject to unknown but bounded state disturbances and measurement noise. Built on recent estimation strategies designed one-dimensional systems, proposed based introduction of weight...

Photon spheres play a pivotal role in the imaging of luminous objects near black holes. In this paper, we examine observational appearances star freely falling hairy holes, which can possess one or two photon outside event horizon. When there exists single sphere, total luminosity measured by distant observers decreases exponentially with time at late times. Due to successive arrivals photons o...

The passivity-based control (PBC) is recognized as an effective energy shaping approach to guarantee the asymptotic stability of whole system by using passivity property. However, model- and sensor-based characteristics limit its development application. combination PBC online estimation technique can solve these problems. purpose this article propose a controller observer, which are designed s...