Lateral fligh control design for a highly flexible aircraft using a nonsmooth method

This paper describes a nonsmooth optimization technique for designing a lateral flight control law for a highly flexible aircraft. Flexible modes and high-dimensional models pose a major challenge to modern control design tools. We show that the nonsmooth approach offers potent and flexible alternatives in this difficult context. More specifically, the proposed technique is used to achieve a mix of frequency domain as well as time domain requirements for a set of different flight conditions

A knowledge-based system with learning for computer communication network design

Computer communication network design is well-known as complex and hard. For that reason, the most effective methods used to solve it are heuristic. Weaknesses of these techniques are listed and a new approach based on artificial intelligence for solving this problem is presented. This approach is particularly recommended for large packet switched communication networks, in the sense that it permits a high degree of reliability and offers a very flexible environment dealing with many relevant design parameters such as link cost, link capacity, and message delay

Inhibition of type III radio emissions due to the interaction between two electron beams: Observations and simulations

International audienceWe report the peculiar interaction of two type III bursts observed in the solar wind. As electronbeams propagating on the same magnetic field lines cross, a spectacular depletion of the type III radioemission is observed. We combine observations from the WAVES experiment on board the STEREO missiontogether with kinetic plasma simulations to study the extinction of type III radio emission resulting fromthe interaction between two electron beams. The remote observations enable to follow the electron beamsin the interplanetary medium and show that the level of radiated radio waves is recovered after the beamcrossing. The in situ observations of beam-driven Langmuir waves give evidence for Langmuir decay. Thedensity fluctuations are extracted from in situ observations. The velocity of the beams is independentlyevaluated from in situ observations of decaying Langmuir waves and remote radio observations. The kineticsimulations show that the level of beam-driven Langmuir waves is reduced as the two beams cross. Weshow that the slow beam induced a strong reduction of the quasilinear relaxation of the fast beam, limitingthe amplitude of the generated Langmuir waves. Moreover, in the case of two electron beams, the lack ofLangmuir wave coherence reduces the efficiency of the Langmuir parametric decay. We thus conclude thatthe observed depletion of the type III radio emission is independent of the radio emission mechanism, aslong as it depends on the Langmuir amplitude and coherence

Parallelization of a relaxation scheme modelling the bedload transport of sediments in shallow water flow

In this work we are interested in numerical simulations for bedload erosion processes. We present a relaxation solver that we apply to moving dunes test cases in one and two dimensions. In particular we retrieve the so-called anti-dune process that is well described in the experiments. In order to be able to run 2D test cases with reasonable CPU time, we also describe and apply a parallelization procedure by using domain decomposition based on the classical MPI library.Comment: 19 page

FullSWOF_Paral: Comparison of two parallelization strategies (MPI and SKELGIS) on a software designed for hydrology applications

In this paper, we perform a comparison of two approaches for the parallelization of an existing, free software, FullSWOF 2D (http://www. univ-orleans.fr/mapmo/soft/FullSWOF/ that solves shallow water equations for applications in hydrology) based on a domain decomposition strategy. The first approach is based on the classical MPI library while the second approach uses Parallel Algorithmic Skeletons and more precisely a library named SkelGIS (Skeletons for Geographical Information Systems). The first results presented in this article show that the two approaches are similar in terms of performance and scalability. The two implementation strategies are however very different and we discuss the advantages of each one.Comment: 27 page

H\"older continuous solutions to Monge-Amp\`ere equations

Let $(X,\omega)$ be a compact K\"ahler manifold. We obtain uniform H\"older regularity for solutions to the complex Monge-Amp\`ere equation on $X$ with $L^p$ right hand side, $p>1$. The same regularity is furthermore proved on the ample locus in any big cohomology class. We also study the range \MAH(X,\omega) of the complex Monge-Amp\`ere operator acting on $\omega$-plurisubharmonic H\"older continuous functions. We show that this set is convex, by sharpening Ko{\l}odziej's result that measures with $L^p$-density belong to \MAH(X,\omega) and proving that \MAH(X,\omega) has the "$L^p$-property", $p>1$. We also describe accurately the symmetric measures it contains.Comment: LaTeX, 23 page

Extraction et structuration des relations multi-types à partir de texte

International audienceLes relations entre termes jouent toujours un rôle très important dans la représentation de contenu du texte. Ces relations qu'elles soient de nature statistique, syntaxique ou sémantique, leur information abordée reflète le contexte au niveau local ou global des termes et contribuent donc à la compréhension du texte. Dans le cadre de ce travail, nous proposons une méthode hybride d'extraction, de structuration et de filtration des relations multi types dans le texte. La base de connaissances extraite pourra éventuellement être appliquée à l'expansion de requête en vue d'améliorer la performance de recherche d'information. Nous avons également évalué lors d'une expérimentation les différentes relations extraites

Extraction et structuration des relations multi-types à partir de texte

International audienceLes relations entre termes jouent toujours un rôle très important dans la représentation de contenu du texte. Ces relations qu'elles soient de nature statistique, syntaxique ou sémantique, leur information abordée reflète le contexte au niveau local ou global des termes et contribuent donc à la compréhension du texte. Dans le cadre de ce travail, nous proposons une méthode hybride d'extraction, de structuration et de filtration des relations multi types dans le texte. La base de connaissances extraite pourra éventuellement être appliquée à l'expansion de requête en vue d'améliorer la performance de recherche d'information. Nous avons également évalué lors d'une expérimentation les différentes relations extraites

Electrochemical behavior of indolone-N-oxides: Relationship to structure and antiplasmodial activity

Indolone-N-oxides exert high parasiticidal activity at the nanomolar level in vitro against Plasmodiumfalciparum, the parasite responsible for malaria. The bioreductive character of these molecules was investigated using cyclic voltammetry and EPR spectroelectrochemistry to examine the relationship between electrochemical behavior and antimalarial activity and to understand theirmechanisms of action. For all the compounds (37 compounds) studied, the voltammograms recorded in acetonitrile showed a well-defined and reversible redox couple followed by a second complicated electron transfer. The first reduction (−0.88 VbE1/2b−0.50 V vs. SCE) was attributed to the reduction of the N-oxide function to form a radical nitroxide anion. The second reduction (−1.65 VbE1/2b−1.14 V vs. SCE) was assigned to the reduction of the ketone function. By coupling electrochemistry with EPR spectroscopy, the EPR spectra confirmed the formation of the nitroxide anion radical.Moreover, the experiments demonstrated that a slowprotonation occurs at the carbon of the nitrone function and not at the NO function. A relationship between electrochemical behavior and indolone-N-oxide structure can be established for compounds with R1=―OCH3, R2=H, and electron-withdrawing substituents on the phenyl group at R3. The results help in the design of new molecules with more potent in vivo antimalarial activity

Beam to concrete-filled rectangular hollow section column joints using long bolts

peer reviewedThis paper presents a research on a specific type of unstiffened extended end-plate joint used to connect I-shaped beams to concrete-filled rectangular hollow section columns. The main idea is to use long bolts throughout the column to connect the beam end-plates, so avoiding intermediate connecting elements (e.g. a reverse U channel) or special bolts (e.g. blind bolts). However, the use of long bolts for beam-to-column connections is still rare in the construction and no design procedure exists in the Eurocodes; this justifies the pre-sent research. Firstly, a test program within a RFCS European project titled HSS-SERF “High Strength Steel in Seismic Resistant Building Frames”, 2009-2013 was performed. In this project, specimens subjected to sig-nificant bending moments (and shear) or to shear only was defined. Then, analytical developments based on the component approach and aimed at predicting the joint response have been carried out; their validity is demonstrated through comparisons with the tests. Finally, design guidelines have been provided