All Years Seminars
[INMA] 2008-09-30 (14.00) : "Modélisation dynamique et commande des procédés d'épuration biologique des eaux usées à boues activées"
At Euler building
Speaker :
Robert David (UCL)
Abstract : Le procédé d'épuration par boues activées est un traitement biochimique qui dégrade les éléments carbonés et azotés présents dans les eaux usées. Cet exposé met d'abord l'accent sur la modélisation de la décantation des boues, une étape primordiale du procédé, avant de considérer un modèle du procédé entier. La réduction et la linéarisation de celui-ci permet alors une synthèse de commande robuste par retour d'état qui régule le taux d'oxygène et les concentrations en sortie des polluants.
[INMA] 2008-09-23 (14.00) : "A Subspace-Based Method for Solving Lagrange--Sylvester Interpolation"
At Euler building
Speaker :
Huseyin AKCAY (Anadolu University, Turkey)
Abstract : In this talk, we study the Lagrange--Sylvester interpolation of rational matrix functions which are analytic at infinity,
and propose a new interpolation algorithm based on the recent subspace-based identification methods. The proposed algorithm is numerically
efficient and delivers a minimal interpolant in state-space form. The solvability condition for the subspace-based algorithm is particularly
simple and depends only on the total multiplicity of the interpolation nodes. As an application, we consider subspace-based system identification
with interpolation constraints, which arises, for example, in the identification of continuous-time systems with a given relative degree.
[INMA] 2008-09-16 (14.00) : "Computational Approaches to H∞ problems and Differential Games"
At Euler building
Speaker :
Brian ANDERSON (Australian National University)
Abstract : Linear H∞ problems require the solution of Riccati equations with an indefinite quadratic term, which can be computationally challenging. For H2 Riccati equations, numerical problems can often be overcome using the Kleinman iteration, involving a sequence of Lyapunov equations. While this is not directly possible for Riccati equations with an indefinite quadratic term, an iteration involving a sequence of H2 equations is possible which allows a double iteration involving Lyapunov equations.
These ideas are given a game theory interpretation, which then suggests an extension of the results that will also be exposed; the extension indicates how a Hamilton-Jacobi-Bellman-Isaacs equation for a class of nonlinear game theory problems can be solved by iterating of Hamilton-Jacobi-Bellman equations, each of which in turn can be solved by iteration using linear partial differential equations.
[INMA] 2008-05-30 (11.00) : Stability and Control Synthesis of Switching Systems Subject to Actuator Saturation
At Euler building
Speaker :
Abdellah BENZAOUIA
(EACPI, University Cadi Ayyad,
)
Abstract :
This paper presents sufficient conditions for the stabilization of switching discrete-time linear systems subject to actuator saturations.
These conditions are obtained by using successively state and output feedback control laws. The obtained results are formulated in terms of LMI's.
Three sets of LMI's are presented for output feedback case. A numerical example is used to illustrate the technique by using a linear optimization problem subject to LMI constraints.
Key-words: Switching systems, Actuator saturations, invariant sets, Lyapunov functions, LMI's.
[INMA] 2008-05-20 (14.00) : Adding head to eye movements: what are the implications for visual tracking?
At Euler building
Speaker :
Daye, Pierre
Abstract :
In everyday life, humans make combined eye-head movements to reorient their gaze
(Gaze = Eye movement with respect to the head + head movement with respect to the torso).
Combined eye-head movements are necessary when the targets of interest are outside the so-called "oculomotor range".
In this seminar, we will first present the main characteristics of combined eye-head movements. We will then show and
discuss results from a 2D gaze orientation task to memorized targets.
Seminars
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+32 10 47 80 36
secretaire-inma@uclouvain.be
Mon – Fri 9:00A.M. – 5:00P.M.
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