All Years Seminars
[INMA] 2011-05-24 (15.00) : Solving Partial Differential Equations on Arbitrary Surfaces using the Radial Basis Functions Method
At Euler building
Speaker :
Cécile PIRET (UCL)
Abstract : The Radial Basis Functions (RBFs) method was introduced in the 1970s as an interpolation technique and was adapted in the 1990s to solve partial differential equations (PDEs). Although it is a fairly new technique, its advantages (amongst others, it is meshless, spectrally accurate and works in N dimensions) have made it a powerful tool to accurately and stably discretize differential operators, and thus solve PDEs on quite complex geometries. In this talk, a brief outline of the method will be given and a novel technique to solve PDEs on arbitrary surfaces via RBFs will be presented.
[INMA] 2011-05-10 (15.00) : Bridging the gap between multi-agent navigation and networked control
At Euler building
Speaker :
Dimos DIMAROGONAS (KTH)
Abstract : The development of decentralized control methodologies for navigation of multi-robot/vehicle systems is of paramount importance for the
faster convergence and overall deployment of such systems in various applications including formation control, search and rescue missions, manufacturing,
multi-UAV/UGV operations and many more. On the other hand, it is important to consider network and limited communication aspects between the agents
when designing such controllers. While a lot of research has been devoted to both aspects of multi-agent control, there is still shortage in the
unification of navigation and networked specs. In this talk I will present parts of our research within the two areas and propose possible future
research directions towards unification.
[INMA] 2011-05-03 (15.00) : A frequency domain approach to the identification of time-varying systems
At Euler building
Speaker :
John LATAIRE (VUB)
Abstract : A time-varying system is a system whose dynamic behaviour changes with time.
As an example consider a swinging mass, attached to a rod with a varying length. As this rod shortens, the speed of oscillation increases,
yielding a time-varying resonance frequency. Most existing identification tools for time-varying systems have been formulated in the time domain.
The present research investigates how a frequency domain formulation could be beneficial for the identification of LTV (Linear Time-Varying) systems.
It turns out that, when using multisine excitations, a lot of insight on the evolution of the instantaneous dynamics can be extracted from a
simple inspection of the spectral response of the system. This will be elucidated during the presentation
[INMA] 2011-04-26 (15.00) : A new algorithm to compute communities in large networks: application to image and video processing
At Euler building
Speaker :
Browet, Arnaud
Abstract : During the last years, there has been an increasing interest for large
graph analysis due to the development of network modeling in various
areas. Real networks have an high tendency to cluster themselves in
community structures, i.e. in groups of highly connected vertices with
weak links between groups. The Louvain method is a community detection
algorithm that has proven its high capacity to extract good
communities. In this talk, we will present a new community detection
technique based on a fast approximation of the classical Louvain
method with only one assignment and one correction step. We will show
that, in spite of its simplicity, the method also extracts good
community structures and can even be better in terms of quality than
the classical Louvain method when the uncertainty of the graph is
increasing. We will apply this algorithm to the image segmentation and
video tracking problems.
[INMA] 2011-04-07 (16.30) : COLLOQUIUM CESAME/MAPA: Peut-on détecter les singularités des cristaux liquides ?
At Euler building
Speaker :
Augusto PONCE (UCL)
Abstract : Un problème de minimisation issu d'un modèle de cristaux liquides met en
évidence la question du bon choix de la classe de fonctions admissibles
que nous rencontrons souvent en calcul de variations. Puisque ces
fonctions doivent être à valeurs dans la sphère, des obstacles
topologiques jouent aussi un rôle dans ce problème. Nous nous
intéressons en particulier à savoir comment détecter les singularités
topologiques et comment les distinguer des singularités analytiques.
Seminars
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