All Years Seminars
[INMA] 2006-08-31 (9.30 am) : Brain puncture/FEM modelling of the brain : state of the art
At Euler lecture room
Speaker :
Andre Ascensao (Lic. Biological Engineering MCP/TOP - BioMEMS KULeuven)
Abstract : Unknown
[INMA] 2006-07-11 (15.00 pm) : "A discontinuous Galerkin finite element method for the Cahn Hilliard Equation"
At Euler building
Speaker :
Krishna Garikipati (University of Michigan)
Abstract :
Written originally to model phase separation in binary alloys, the Cahn-Hilliard
Equation has also been applied to problems as diverse as multi-phase fluid flow, image processing,
planet formation and pattern formation in biology. It is a parabolic partial differential with an instability-promoting
second-order spatial derivative, but is stabilized by a fourth-order derivative. The competition between these terms
leads to the formation of diffuse interfaces with tunable thickness. This equation has also spawned a burgeoning
mathematical literature. In this talk I will introduce this equation from a physical standpoint, and proceed to a
discontinuous Galerkin (DG) finite element method designed to treat the high-order derivatives. The crux of the
talk is that $C0$ interpolation functions are sufficient in the DG setting despite the high-order derivatives. The weak form
of the problem is the point of departure for proving convergence of the method, and stability of the time-discrete solutions.
Several numerical examples will also be presented.
[INMA] 2006-05-30 (14.00 pm) : "An Approach to Data-driven Controller Design : Correlation-based tuning"
At Euler building
Speaker :
Ljubisa Miskovic (Ecole Polytechnique Fédérale de Lausanne, Suisse/CESAME)
Abstract :
Correlation-based tuning (CbT) is a data-driven controller tuning method intended
to address the model following problem. The underlying idea of this method is inspired
rom the well-known correlation approach in system identification. The main idea is to
modify the control objective so that, instead of minimizing a norm of the error signal,
one tries to make the closed-loop output error uncorrelated with the reference signal.
This way, the closed-loop output error will mainly contain the contribution of noise and
perfect model-following can be achieved. In this talk, the basic features of this method
as well as some extensions will be presented.
[INMA] 2006-05-23 (14.00 pm) : "On the Positive LQ-Problem for Linear Continuous-Time Systems"
At Euler building
Speaker :
Charlotte Beauthier (FUNDP)
Abstract :
Sufficient conditions are reported for the existence of
a solution to the positive linear quadratic (LQ) problem.
These conditions are established by using a Newton-type iterative
scheme converging to the unique stabilizing positive semi-definite
solution of the algebraic Riccati equation. These results are obtained
for stable and detectable linear continuous time-invariant positive systems.
[INMA] 2006-05-09 (14.00 pm) : "How can we track a target when it is occluded"
At Euler building
Speaker :
Orban de Xivry, Jean-Jacques
Abstract :
In our everyday life, we see a lot of moving objects. Moreover, it often happens that an object,
while moving, disappears behind another object and then reappears. Our oculomotor system is
able to keep on pursuing the target even if it disappears. To do so, it combines both smooth
pursuit (slow eye movements) and saccades (fast eye movements).
We will analyse how both systems interact during the occlusion of the target and how they
combine their response to be at the right position and at the right velocity when the target reappears.
Seminars
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