Performance Analysis of Kernel Adaptive Filters based on LMS Algorithm

AbstractThe design of adaptive nonlinear filters has sparked a great interest in the machine learning community. The present paper aims to present some recent developments in nonlinear adaptive filtering. It provides an in-depth analysis of the performance and complexity of a class of kernel filters based on the least-mean-squares algorithm. A key feature that underlies kernel algorithms is that they map the data in a high-dimensional feature space where linear filtering is performed. The arithmetic operations are carried out in the initial space via evaluation of inner products between pairs of input patterns called kernels. The SNR improvement and the convergence speed of kernel-based least-mean-squares filters are evaluated on two types of applications: time series prediction and cardiac artifacts extraction from magnetoencephalographic data

Topologie du texte dans Alcools: Théorie générale de la symétrie du texte poétique

Communication de Martial Lengellé ( Université de Picardie Jules Verne, membre associé THALIM)) du 5 septembre 2018 au Colloque International Apollinaire, Cent ans et après - Abbaye de Stavelot - Musée Apollinaire (5-8 septembre 2018). Une organisation de l'Université de Liège, de l'Université de Paris III-Sorbonne Nouvelle et de l'Association Internationale des Amis de Guillaume Apollinaire avec l'aide d'E.T.C Abbaye de StavelotInternational audienceIl s'agit de définir les frontières du texte poétique dans Alcools, en dehors des marques de l'hyper-syntaxe ( strophe, mètre, rime), et de mettre en valeur le principe général de symétrie comme axe constitutif du poème

TOPOLOGIE DU COMMENCÉ , OU LA QUÊTE DU TEXTE ALEXAKIEN: THÉORIE GÉNÉRALE DE LA SYMÉTRIE DU TEXTE POÉTIQUE

International audiencePeut-on comprendre le «commencement» d’un texte davantage comme substance ou matrice que comme clôture, même si l’histoire littéraire a su imposer des codes de la délimitation? Notre propos est de saisir la relation proche que le «commencé» alexakien entretient avec lui-même par le biais de la notion de frontière-miroir. Cette limite révèlerait en effet les flux opposés d’un même mouvement narratif. Or cette divergence symétrique du «même» aurait la particularité de circonscrire l’espace de ce que l’on nomme : commencement

Edge Detection on Eddy Current Image to Increase Defect Characterization

As the nuclear yard ages, the control of steam generator tubes (SGT) must deal with new problems. In fact new defects appear, especially in the area of the tube sheet, of the tube support or at the U-bend area. Eddy current testing using Rotating Probe Coil (absolute mode) gives a better resolution. These measurements allow smaller defects to be detected along different orientations, especially defects along the circumference in the rolling transition. Signals collected during the exploration of the tube internal wall with this coil contain the useful information which is represented in the form of a cartography (or image) for each of the signal complex components

Recent Development of MESSINE, a 3D Eddy Current Model

In the 1996 QNDE Conference, we presented a parametric forward model [1], which has been recently named MESSINE (Model for Electromagnetic Simplified Simulation In Nondestructive Evaluation), to predict eddy current signal. The proposed model first discretizes the eddy current distribution into current loops. A parametric description of the shape of these loops is given according to the observation of the results obtained with a three-dimensional finite element code which provides a realistic distribution of the induced currents. The loops’ inductances and resistances are then calculated. By considering the system constituted of the coil and the current loops as a « multi-transformer», their current intensity is determined. The impedance change, which is the component of the eddy current signal, can then be deduced. The model was validated in the case of axisymmetric configurations. Comparisons with both analytical (Dodd and Deeds [2]) and numerical models showed very good agreements. Then the proposed model was applied to three-dimensional configurations. Impedance changes of a coil along rectangular through-wall slot were calculated. Comparisons with experimental results show a fairly good agreement for the impedance change phases, but a poorer one for the impedance change amplitudes. Investigations were made to improve the parametric description of the current loop deformation. One of the solutions to improve the parametric description is presented here

The banana genome hub

Banana is one of the world's favorite fruits and one of the most important crops for developing countries. The banana reference genome sequence (Musa acuminata) was recently released. Given the taxonomic position of Musa, the completed genomic sequence has particular comparative value to provide fresh insights about the evolution of the monocotyledons. The study of the banana genome has been enhanced by a number of tools and resources that allows harnessing its sequence. First, we set up essential tools such as a Community Annotation System, phylogenomics resources and metabolic pathways. Then, to support post-genomic efforts, we improved banana existing systems (e.g. web front end, query builder), we integrated available Musa data into generic systems (e.g. markers and genetic maps, synteny blocks), we have made interoperable with the banana hub, other existing systems containing Musa data (e.g. transcriptomics, rice reference genome, workflow manager) and finally, we generated new results from sequence analyses (e.g. SNP and polymorphism analysis). Several uses cases illustrate how the Banana Genome Hub can be used to study gene families. Overall, with this collaborative effort, we discuss the importance of the interoperability toward data integration between existing information systems. (Résumé d'auteur