ABSTRACT: This paper presents a procedure for parametric uncertainty modeling of a highly nonlinear multiinput multioutput (MIMO) cross coupled system for the purpose of Linear Fractional Transformation (LFT) model realization. A novel technique has been considered to represent the control oriented LFT modeling of linear parametric models. A systematic approach is to find the equivalent represe...

OBJECTIVE To determine the prevalence of biliopancreatic reflux (BPR) in patients with biliary pancreatitis (BP) undergoing elective cholecystectomy with intraoperative cholangiography (IOC) in comparison with a control group of symptomatic cholelithiasis (CG). PATIENTS AND METHODS Retrospective review of 107 consecutive BP cases. BPR was determined by IOC and liver function tests (LFT) were ...

Formal robustness analysis of aircraft control upset prevention and recovery systems could play an important role in their validation and ultimate certification. Such systems (developed for failure detection, identification, and reconfiguration, as well as upset recovery) need to be evaluated over broad regions of the flight envelope and under extreme flight conditions, and should include vario...

A state estimator is an algorithm that computes the current state of a time-varying system from on-line measurements. Physical quantities such as measurements and parameters are characterised by uncertainty. Understanding how uncertainty affects the accuracy of state estimates is therefore a prerequisite to the application of such techniques to real systems. In this paper we develop a method of...

This paper presents a novel estimation and identification approach for lateral vehicle dynamics. The algorithm leverages on Linear Fraction Transform (LFT) reformulation of tyre models, allowing simple computationally efficient inclusion complex nonlinear dynamic like, example, two-wheels, four-wheels or single-track as model, Pacejka, brush Fiala model. As result, this technique can be easily ...

The Fluctuation Theorem (FT) gives an analytic expression for the probability, in a nonequilibrium system of finite size observed for a finite time, that the dissipative flux will flow in the reverse direction to that required by the Second Law of Thermodynamics. In the present letter a Local version of the Fluctuation Theorem (LFT), is derived. We find that in the case of planar Poiseuille flo...

This paper deals with the robust control of an Autonomous Underwater Vehicle (AUV) subject to communication constraints. The aim is the design of a gain-scheduled varying sampling controller using non periodic measurements from ultrasonic sensors. The contribution of this work lies in a new model formulation of varying sampling discrete-time systems using the Linear Fractional Transformation (L...

We study n+ 3-point correlation functions of exponential fields in Liouville field theory with n degenerate and 3 arbitrary fields. An analytical expression for these correlation functions is derived in terms of Coulomb integrals. The application of these results to the minimal Liouville gravity is considered. 1 Liouville field theory Last years since the seminal paper of A. Polyakov [1] Liouvi...