Results for "Jérôme Thevenot"

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Multimodal Machine Learning-based Knee Osteoarthritis Progression Prediction from Plain Radiographs and Clinical DataApr 12 2019May 06 2019Knee osteoarthritis (OA) is the most common musculoskeletal disease without a cure, and current treatment options are limited to symptomatic relief. Prediction of OA progression is a very challenging and timely issue, and it could, if resolved, accelerate ... More
Bone Density and Texture from Minimally Post-Processed Knee Radiographs in Subjects with Knee OsteoarthritisFeb 06 2019Plain radiography is the most common modality to assess the stage of osteoarthritis. Our aims were to assess the relationship of radiography-based bone density and texture between radiographs with minimal and clinical post-processing, and to compare the ... More
Automatic Knee Osteoarthritis Diagnosis from Plain Radiographs: A Deep Learning-Based ApproachOct 29 2017Knee osteoarthritis (OA) is the most common musculoskeletal disorder. OA diagnosis is currently conducted by assessing symptoms and evaluating plain radiographs, but this process suffers from subjectivity. In this study, we present a new transparent computer-aided ... More
A novel method for automatic localization of joint area on knee plain radiographsJan 31 2017Apr 05 2017Osteoarthritis (OA) is a common musculoskeletal condition typically diagnosed from radiographic assessment after clinical examination. However, a visual evaluation made by a practitioner suffers from subjectivity and is highly dependent on the experience. ... More
Roots, symmetries and conjugacy of pseudo-Anosov mapping classesOct 10 2007An algorithm is proposed that solves two decision problems for pseudo-Anosov elements in the mapping class group of a surface with at least one marked fixed point. The first problem is the root problem: decide if the element is a power and in this case ... More
Polcovar: Software for Computing the Mean and Variance of Subgraph Counts in Random GraphsFeb 24 2014May 04 2016The mean and variance of the number of appearances of a given subgraph $H$ in an Erd\H{o}s--R\'enyi random graph over $n$ nodes are rational polynomials in $n$. We present a piece of software named Polcovar (from "polynomial" and "covariance") that computes ... More
DESP-C++: A Discrete-Event Simulation Package for C++Nov 28 2016DESP-C++ is a C++ discrete-event random simulation engine that has been designed to be fast, very easy to use and expand, and valid. DESP-C++ is based on the resource view. Its complete architecture is presented in detail, as well as a short " user manual ... More
Prescription of Gauss curvature using optimal mass transportMay 18 2015In this paper we give a new proof of a theorem by Alexandrov on the Gauss curvature prescription of Euclidean convex sets. This proof is based on the duality theory of convex sets and on optimal mass transport. A noteworthy property of this proof is that ... More
The value of Repeated Games with an informed controllerMar 23 2008Apr 20 2009We consider the general model of zero-sum repeated games (or stochastic games with signals), and assume that one of the players is fully informed and controls the transitions of the state variable. We prove the existence of the uniform value, generalizing ... More
Uniform value in Dynamic ProgrammingMar 19 2008Apr 20 2009We consider dynamic programming problems with a large time horizon, and give sufficient conditions for the existence of the uniform value. As a consequence, we obtain an existence result when the state space is precompact, payoffs are uniformly continuous ... More
Taming the Penguin in the B0(t) -> Pi+Pi- CP-asymmetry: Observables and Minimal Theoretical InputJun 24 1998Oct 29 1998Penguin contributions, being not negligible in general, can hide the information on the CKM angle alpha coming from the measurement of the time-dependent B0(t) -> pi+pi- CP-asymmetry. Nevertheless, we show that this information can be summarized in a ... More
The illusion of neutron star magnetic field estimatesMar 04 2019Neutron stars radiate in a broad band spectrum from radio wavelengths up to very high energies. They have been sorted into several classes depending on their respective place in the $P-\dot{P}$ diagram and depending on spectral/temporal properties. Fundamental ... More
Non abelian Reidemeister torsion and volume form on the SU(2)-representation space of knot groupsMar 26 2004Apr 18 2005For a knot K in $S^3$ and a regular representation $\rho$ of its group $G_K$ into SU(2) we construct a non abelian Reidemeister torsion on the first twisted cohomology group of the knot exterior. This non abelian Reidemeister torsion provides a volume ... More
Proceedings Sixteenth Conference on Theoretical Aspects of Rationality and KnowledgeJul 25 2017This volume consists of papers presented at the Sixteenth Conference on Theoretical Aspects of Rationality and Knowledge (TARK) held at the University of Liverpool, UK, from July 24 to 26, 2017. TARK conferences bring together researchers from a wide ... More
A tutorial on Zero-sum Stochastic GamesMay 16 2019Zero-sum stochastic games generalize the notion of Markov Decision Processes (i.e. controlled Markov chains, or stochastic dynamic programming) to the 2-player competitive case : two players jointly control the evolution of a state variable, and have ... More
Slope filtration on Banach-Colmez spacesOct 31 2016We give a new proof of the "weakly admissible implies admissible" theorem of Colmez and Fontaine describing the semi-stable p-adic representations. We study Banach-Colmez spaces, i.e. p-adic Banach spaces with the extra data of a C_p-algebra of analytic ... More
Probabilistic cellular automata with general alphabets letting a Markov chain invariantOct 12 2014This paper is devoted to probabilistic cellular automata (PCA) on $\mathbb{N}$, $\mathbb{Z}$ or $\mathbb{Z}/n\mathbb{Z}$, depending of two neighbors, with a general alphabet $E$ (finite or infinite, discrete or not). We study the following question: under ... More
Construction and enumeration of circuits capable of guiding a miniature vehicleMar 29 2016In contrast to traditional toy tracks, a patented system allows the creation of a large number of tracks with a minimal number of pieces, and whose loops always close properly. These circuits strongly resemble traditional self-avoiding polygons (whose ... More
Pauli Terms Must Be Absent In Dirac EquationMay 20 2000It should be of interest, whether Dirac's equation involves all 16 basis elements of his Clifford algebra $Cl_D.$ These include the 6 `tensorial' $\sigma^{\mu\nu}$ with which the `Pauli terms' are formed. We find that these violate a basic axiom of any ... More
Infinite sequence of fixed point free pseudo-Anosov homeomorphismsJun 25 2008Aug 24 2009We construct infinite sequences of pseudo-Anosov homeomorphisms without fixed points and leaving invariant a sequence of orientable measured foliations on the same topological surface and the same stratum of the space of abelian differentials. The existence ... More
General limit value in Dynamic ProgrammingJan 03 2013We consider a dynamic programming problem with arbitrary state space and bounded rewards. Is it possible to define in an unique way a limit value for the problem, where the "patience" of the decision-maker tends to infinity ? We consider, for each evaluation ... More
Recurrence rates for observations of flowsJan 27 2011We study Poincar\'e recurrence for flows and observations of flows. For Anosov flow, we prove that the recurrence rates are linked to the local dimension of the invariant measure. More generally, we give for the recurrence rates for the observation an ... More
Almost sure convergence of randomly truncated stochastic algorithms under verifiable conditionsJun 06 2007We study the almost sure convergence of randomly truncated stochastic algorithms. We present a new convergence theorem which extends the already known results by making vanish the classical condition on the noise terms. The aim of this work is to prove ... More
The IDSA and the homogeneous sphere: Issues and possible improvementsJun 13 2016In this paper, we are concerned with the study of the Isotropic Diffusion Source Approximation (IDSA) (Baxter et al., Phys. Rev. E 73, 046118, 2006) of radiative transfer. After having recalled well-known limits of the radiative transfer equation, we ... More
Continuous time limits of the Utterance Selection ModelJun 27 2016In this paper, we derive new continuous time limits of the Utterance Selection Model (USM) for language change (Baxter et al., Phys. Rev. E {\bf 73}, 046118, 2006). This is motivated by the fact that the Fokker-Planck continuous time limit derived in ... More
Variational Formulation of Time-Dependent Density Functional TheoryOct 25 2012We present a variational formulation of Time-Dependent Density Functional Theory similar to the constrained-search variational formulation of ground-state density-function theory. The formulation is applied to justify the time-dependent Kohn-Sham method. ... More
Parametrizing modified gravity for cosmological surveysMay 12 2017One of the challenges in testing gravity with cosmology is the vast freedom opened when extending General Relativity. For linear perturbations, one solution consists in using the Effective Field Theory of Dark Energy (EFT of DE). Even then, the theory ... More
Les espaces de Berkovich sont angéliquesMay 02 2011Dec 14 2012Although Berkovich spaces may fail to be metrizable when defined over too big a field, we prove that a large part of their topology can be recovered through sequences: for instance, limit points of subsets are actual limits of sequences and compact subsets ... More
Edge correlation function of the 8-vertex model when $a+c = b+d$Jul 18 2016Feb 07 2017This paper is devoted to the 8-vertex model and its edge correlation function. In some particular (integrable) cases, we find a closed form of the edge correlation function and we deduce also its asymptotic. In addition, we quantify influence of boundary ... More
Estimating copula measure using ranks and subsampling: a simulation studySep 25 2007We describe here a new method to estimate copula measure. From N observations of two variables X and Y, we draw a huge number m of subsamples (size n<N), and we compute the joint ranks in these subsamples. Then, for each bivariate rank (p,q) (0<p,q<n+1), ... More
La droite de Berkovich sur ZSep 17 2008We study here the Berkovich line over the ring of integers of a number field. It is a natural object which contains complex and non-Archimedean analytic spaces associated to each place. We prove that this line satisfies good topological and algebraic ... More
Existence d'une courbe à courbure positive maximisant le minimum du rayon de courbure -- "Observation numérique"Jun 19 2019We consider the set E of curves with positive algebraic curvature, whose extremities and tangents in their extremities are given. For each of the curves of E, we define the minimum of the radius of curvature. We first prove that there exists a curve of ... More
Multimodal Machine Learning-based Knee Osteoarthritis Progression Prediction from Plain Radiographs and Clinical DataApr 12 2019Knee osteoarthritis (OA) is the most common musculoskeletal disease without a cure, and current treatment options are limited to symptomatic relief. Prediction of OA progression is a very challenging and timely issue, and it could, if resolved, accelerate ... More
Correlation function of the 8-vertex model with free boundary conditions using triangular probabilistic cellular automataJul 18 2016This paper is devoted to the 8-vertex model and its edge correlation function. In some particular (integrable) cases, we find a closed form of the edge correlation function and we deduce also its asymptotic. To do this, we introduce probabilistic cellular ... More
Implementation of the direct evaluation of strains using a phase analysis code for random patternsSep 09 2011A new approach for decoding directly strains from surfaces encoded with random patterns has been developed and validated. It is based on phase analysis of small region of interest. Here we adapt to random patterns new concepts proposed by Badulescu (2009) ... More
Un résultat de connexité pour les variétés analytiques p-adiques. Privilège et noethérianitéNov 28 2006Sep 16 2008Let $k$ be a non-Archimedean field, $X$ a $k$-affinoid space and $f$ an analytic function over $X$. We precisely describe how the geometric connected components of the spaces $\{x \in X, |f(x)| \ge \varepsilon\}$ behave with regards to $\varepsilon$. ... More
Sur les composantes connexes d'une famille d'espaces analytiques p-adiquesJan 10 2014Let $X=\mathcal{M}(A)$ be an affinoid space and let $f,g \in A$. We study the sets of connected components of the spaces defined by an inequality of the form $|f|\le r|g|$, with $r\ge 0$. We prove that there exists a finite partition of $\mathbb{R}_+$ ... More
Polynomial approximation of Berkovich spaces and definable typesApr 16 2012We investigate affine Berkovich spaces over maximally complete fields and prove that they may be approximated by simpler spaces when the only functions we need to evaluate are polynomials of bounded degree. We derive applications to semi-algebraic sets ... More
Estimate dependence in medium dimensions, using ranks and sub-samplingNov 07 2013It is well known that non-parametric methods suffer from the "curse of dimensionality". We propose here a new estimation method for a multivariate distribution, using sub-sampling and ranks, which seems not to suffer from this "curse". We prove that in ... More
Generalized rank weights : a duality statementJun 17 2013Oct 31 2013We consider linear codes over some fixed finite field extension over an arbitrary finite field. Gabidulin introduced rank metric codes, by endowing linear codes over the extension field with a rank weight over the base field and studied their basic properties ... More
Volume entropy for surface groups via Bowen-Series like mapsAug 25 2009We define a Bowen-Series like map for every geometric presentation of a co-compact surface group and we prove that the volume entropy of the presentation is the topological entropy of this particular (circle) map. Finally we find the minimal volume entropy ... More
Pricing American options using martingale basesApr 12 2016In this work, we propose an algorithm to price American options by directly solving the dual minimization problem introduced by Rogers. Our approach relies on approximating the set of uniformly square integrable martingales by a finite dimensional Wiener ... More
A note on Liouville type results for a fractional obstacle problemFeb 28 2019This note is a synthesis of my reflexions on some questions that have emerged during the MATRIX event "Recent Trends on Nonlinear PDEs of Elliptic and Parabolic Type" concerning the qualitative properties of solutions to some non local reaction-diffusion ... More
Particle motion driven by non-uniform thermodynamic forcesFeb 13 2019Mar 06 2019We present a complete reciprocal description of particle motion inside multi-component fluids that extends the conventional Onsager formulation of non-equilibrium transport to systems where the thermodynamic forces are non-uniform on the colloidal scale. ... More
Particle motion driven by non-uniform thermodynamic forcesFeb 13 2019We present a complete reciprocal description of particle motion inside multi-component fluids that extends the conventional Onsager formulation of non-equilibrium transport to systems where the thermodynamic forces are locally non-uniform on the colloidal ... More
Non abelian twisted Reidemeister torsion for fibered knotsMar 18 2004Feb 11 2005In this article, we give an explicit formula to compute the non-abelian twisted sign-determined Reidemeister torsion of the exterior of a fibered knot in terms of its monodromy. As an application, we give explicit formulae for the non abelian Reidemeister ... More
Pricing path-dependent Bermudan options using Wiener chaos expansion: an embarrassingly parallel approachJan 17 2019In this work, we propose a new policy iteration algorithm for pricing Bermudan options when the payoff process cannot be written as a function of a lifted Markov process. Our approach is based on a modification of the well-known Longstaff Schwartz algorithm, ... More
Analytic p-adic Banach spaces and the fundamental lemma of Colmez and FontaineOct 31 2016This article gives a new proof of the fundamental lemma of the "weakly admissible implies admissible" theorem of Colmez-Fontaine that describes the semi-stable p-adic representations. To this end, we introduce the category of spectral Banach spaces, which ... More
Espaces de Berkovich sur Z : étude localeFeb 03 2012Oct 15 2012We investigate the local properties of Berkovich spaces over Z. Using Weierstrass theorems, we prove that the local rings of those spaces are noetherian, regular in the case of affine spaces and excellent. We also show that the structure sheaf is coherent. ... More
Raccord sur les espaces de BerkovichSep 22 2008Oct 26 2009Let $X$ be a Berkovich space over a valued field. We prove that every finite group is a Galois group over $\Ms(B)(T)$, where $\Ms(B)$ is the field of meromorphic functions over a part $B$ of $X$ satisfying some conditions. This gives a new geometric proof ... More
Sendov conjecture for high degree polynomialsJun 21 2011Nov 15 2011Sendov conjecture tells that if $P$ denotes a complex polynomial having all his zeros in the closed unit disk and $a$ denote a zero of $P$, the closed disk of center $a$ and radius 1 contains a zero of the derivative $P'$. The main result of this paper ... More
Impact of an off-centred dipole on neutron star binariesJul 17 2019Neutron stars are strongly magnetized rotating compact objects. Therefore they also produce huge electric fields accelerating particles to ultra-relativistic energies. The simplest magnetic topology is a dipole traditionally located at the stellar centre. ... More
Data Mining-based Fragmentation of XML Data WarehousesNov 05 2008With the multiplication of XML data sources, many XML data warehouse models have been proposed to handle data heterogeneity and complexity in a way relational data warehouses fail to achieve. However, XML-native database systems currently suffer from ... More
Data Mining-based Materialized View and Index Selection in Data WarehousesJul 11 2007Materialized views and indexes are physical structures for accelerating data access that are casually used in data warehouses. However, these data structures generate some maintenance overhead. They also share the same storage space. Most existing studies ... More
The almost Borel structure of surface diffeomorphisms, Markov shifts and their factorsSep 25 2014Jan 28 2015Extending work of Hochman, we study the almost-Borel structure, i.e., the nonatomic invariant probability measures, of symbolic systems and surface diffeomorphisms. We first classify Markov shifts and characterize them as strictly universal with respect ... More
A mixed finite volume scheme for anisotropic diffusion problems on any gridApr 03 2006We present a new finite volume scheme for anisotropic heterogeneous diffusion problems on unstructured irregular grids, which simultaneously gives an approximation of the solution and of its gradient. In the case of simplicial meshes, the approximate ... More
Sign-changing blow-up for scalar curvature type equationsOct 08 2012Given $(M,g)$ a compact Riemannian manifold of dimension $n\geq 3$, we are interested in the existence of blowing-up sign-changing families $(\ue)_{\eps>0}\in C^{2,\theta}(M)$, $\theta\in (0,1)$, of solutions to $$\Delta_g \ue+h\ue=|\ue|^{\frac{4}{n-2}-\eps}\ue\hbox{ ... More
Projection methods in conic optimizationMar 08 2011There exist efficient algorithms to project a point onto the intersection of a convex cone and an affine subspace. Those conic projections are in turn the work-horse of a range of algorithms in conic optimization, having a variety of applications in science, ... More
Rank weight hierarchy of some classes of cyclic codesJul 15 2014We study the rank weight hierarchy, thus in particular the rank metric, of cyclic codes over the finite field $\mathbb F_{q^m}$, $q$ a prime power, $m \geq 2$. We establish the rank weight hierarchy for $[n,n-1]$ cyclic codes and characterize $[n,k]$ ... More
Stabilisation of the chiral phase of the SU($N=6m$) Heisenberg model on the honeycomb lattice at filling $m\geq 2$Jul 18 2016We show that, when $N$ is a multiple of 6 ($N=6m$, $m$ integer), the \SU{N} Heisenberg model on the honeycomb lattice with $m$ particles per site has a clear tendency toward chiral order as soon as $m\geq 2$. This conclusion has been reached by a systematic ... More
Conical emission from laser filaments and higher-order Kerr effect in airJun 09 2011Dec 16 2011We numerically investigate the conical emission (CE) from ultrashort laser filaments, both considering and disregarding the higher-order Kerr effect (HOKE). While the consideration of HOKE has almost no influence on the predicted CE from collimated beams, ... More
Curriculum Learning for Handwritten Text Line RecognitionDec 05 2013Recurrent Neural Networks (RNN) have recently achieved the best performance in off-line Handwriting Text Recognition. At the same time, learning RNN by gradient descent leads to slow convergence, and training times are particularly long when the training ... More
The convergence Newton polygon of a $p$-adic differential equation IV : local and global index theoremsSep 16 2013Sep 15 2014Let $X$ be a quasi-smooth Berkovich curve over a field of characteristic $0$ and let $\mathscr{F}$ be a locally free $\mathscr{O}_{X}$-module with connection. In this paper, we prove local and global criteria to ensure the finite-dimensionality of the ... More
Laser-induced fluorescence quenching of red fluorescent dyes with green excitation: avoiding artifacts in PIE-FRET and FCCS analysisJun 29 2018Multicolor excitation is at the core of many fluorescence spectroscopy techniques such as PIE-FRET, ALEX-FRET, or FCCS. However, the influence of the multiple laser excitations on the dye photophysics is often overlooked. Here, we show that green laser ... More
On the existence of a limit value in some non expansive optimal control problemsApr 23 2009Oct 21 2009We investigate a limit value of an optimal control problem when the horizon converges to infinity. For this aim, we suppose suitable nonexpansive-like assumptions which does not imply that the limit is independent of the initial state as it is usually ... More
Accelerated Data-Flow AnalysisDec 10 2008Acceleration in symbolic verification consists in computing the exact effect of some control-flow loops in order to speed up the iterative fix-point computation of reachable states. Even if no termination guarantee is provided in theory, successful results ... More
Improved angular momentum evolution model for solar-like stars II. Exploring the mass dependenceFeb 20 2015Mar 02 2015We developed angular momentum evolution models for 0.5 and 0.8 $M_{\odot}$ stars. The parametric models include a new wind braking law based on recent numerical simulations of magnetised stellar winds, specific dynamo and mass-loss rate prescriptions, ... More
Improved angular momentum evolution model for solar-like starsJun 10 2013Jun 20 2013We present new models for the rotational evolution of solar-like stars between 1 Myr and 10 Gyr with the aim to reproduce the distributions of rotational periods observed for star forming regions and young open clusters within this age range. The models ... More
$L^2$-Alexander invariant for knotsMar 26 2013This paper deals with the study of a new family of knot invariants: the $L^2$-Alexander invariant. A main result is to give a method of computation of the $L^2$-Alexander invariant of a knot complement using any presentation of default 1 of the knot group. ... More
On central tendency and dispersion measures for intervals and hypercubesApr 14 2008The uncertainty or the variability of the data may be treated by considering, rather than a single value for each data, the interval of values in which it may fall. This paper studies the derivation of basic description statistics for interval-valued ... More
A family of functional inequalities: Lojasiewicz inequalities and displacement convex functionsDec 08 2016Oct 08 2018For displacement convex functionals in the probability space equip\-ped with the Monge-Kantorovich metric we prove the equivalence between the gradient and functional type \L oja\-sie\-wicz inequalities. \chg{We also discuss the more general case of $\lambda$-convex ... More
Biomedical Data WarehousesJan 27 2017The aim of this article is to present an overview of the existing biomedical data warehouses and to discuss the issues and future trends in this area. We illustrate this topic by presenting the design of an innovative, complex data warehouse for personal, ... More
Benchmarking OODBs with a Generic ToolNov 28 2016We present in this paper a generic object-oriented benchmark (OCB: the Object Clustering Benchmark) that has been designed to evaluate the performances of Object-Oriented Data-bases (OODBs), and more specifically the performances of clustering policies ... More
Demystifying Reachability in Vector Addition SystemsMar 02 2015May 13 2015More than 30 years after their inception, the decidability proofs for reachability in vector addition systems (VAS) still retain much of their mystery. These proofs rely crucially on a decomposition of runs successively refined by Mayr, Kosaraju, and ... More
Reachability in Vector Addition Systems is Primitive-Recursive in Fixed DimensionMar 20 2019The reachability problem in vector addition systems is a central question, not only for the static verification of these systems, but also for many inter-reducible decision problems occurring in various fields. The currently best known upper bound on ... More
Travail, force vive et fatigue dans l'oeuvre de Daniel Bernoulli: vers l'optimisation du fait biologique (1738-1753) / Work, vis viva and tiredness in Daniel Bernoulli's works: towards the optimization of the biological fact (1738-1753)Jan 30 2013The concept of mechanical work is inherited from the concepts of potentia absoluta and men's work, both implemented in the Section IX of Daniel Bernoulli's Hydrodynamica in 1738. Nonetheless, Bernoulli did not confuse those two entities: he defined a ... More
On the asymptotic expansion of the colored Jones polynomial for torus knotsOct 27 2005Feb 28 2007In the asymptotic expansion of the hyperbolic specification of the colored Jones polynomial of torus knots, we identify different geometric contributions, in particular Chern--Simons invaraint and Reidemeister torsion.
Martensitic relief observation by atomic force microscopy in yttria stabilized zirconiaOct 12 2017The tetragonal to monoclinic (t-m) phase transformation of zirconia has been the object of extensive investigations of the last twenty years, and is now recognised as being of martensitic nature. However, martensitic transformation has only been observed ... More
Concentration inequalities for sequential dynamical systems of the unit intervalJun 12 2014Feb 08 2015We prove a concentration inequality for sequential dynamical systems of the unit interval enjoying an exponential loss of memory in the BV norm, and we investigate several of its consequences. In particular, this covers compositions of $\beta$-transformations, ... More
Propagation phenomena in monostable integro-differential equations: acceleration or not?Oct 19 2016We consider the homogeneous integro-differential equation$\partial \_t u=J*u-u+f(u)$ with a monostable nonlinearity $f$. Our interest is twofold: we investigate the existence/non existence of travelling waves, and the propagation properties of the Cauchy ... More
Rapid travelling waves in the nonlocal Fisher equation connect two unstable statesMay 10 2012In this note, we give a positive answer to a question addressed in \cite{Nad-Per-Tan}. Precisely we prove that, for any kernel and any slope at the origin, there do exist travelling wave solutions (actually those which are "rapid") of the nonlocal Fisher ... More
Probabilistic cellular automata with memory two: invariant laws and multidirectional reversibilityOct 16 2017We focus on a family of one-dimensional probabilistic cellular automata with memory two: the dynamics is such that the value of a given cell at time $t+1$ is drawn according to a distribution which is a function of the states of its two nearest neighbours ... More
Weak Limits of Random Coefficient Autoregressive Processes and their Application in Ruin TheoryJul 03 2019We prove that a large class of discrete-time insurance surplus processes converge weakly to a generalized Ornstein-Uhlenbeck process, under a suitable re-normalization and when the time-step goes to 0. Motivated by ruin theory, we use this result to obtain ... More
Modèle géométrique pour une Caractérisation morphométrique d'individus dans des conditions \textit{in situ}Jul 12 2019We develop a non invasive method for determine morphometric caracteristic of individuals. We modelize a individual by a polyarticulated chain of rigid segments and each of these segments corresponds to a volume. For this, each segment is photographed ... More
Pattern tree-based XOLAP rollup operator for XML complex hierarchiesFeb 04 2011With the rise of XML as a standard for representing business data, XML data warehousing appears as a suitable solution for decision-support applications. In this context, it is necessary to allow OLAP analyses on XML data cubes. Thus, XQuery extensions ... More
Dynamic Logic of Common Knowledge in a Proof AssistantDec 19 2007Common Knowledge Logic is meant to describe situations of the real world where a group of agents is involved. These agents share knowledge and make strong statements on the knowledge of the other agents (the so called \emph{common knowledge}). But as ... More
The convex hull of a regular set of integer vectors is polyhedral and effectively computableDec 10 2008Number Decision Diagrams (NDD) provide a natural finite symbolic representation for regular set of integer vectors encoded as strings of digit vectors (least or most significant digit first). The convex hull of the set of vectors represented by a NDD ... More
Extended Skyrme interaction (I): spin fluctuations in dense matterMay 12 2009Jun 18 2009Most of the Skyrme interactions are known to predict spin or isospin instabilities beyond the saturation density of nuclear matter which contradict predictions based on realistic interactions. A modification of the standard Skyrme interaction is proposed ... More
The convergence Newton polygon of a $p$-adic differential equation III : global decomposition and controlling graphsAug 04 2013We deal with locally free $\mathcal{O}_X$-modules with connection over a Berkovich curve $X$. As a main result we prove local and global decomposition theorems of such objects by the radii of convergence of their solutions. We also derive a bound of the ... More
A Parallel Algorithm for solving BSDEs - Application to the pricing and hedging of American optionsFeb 23 2011We present a parallel algorithm for solving backward stochastic differential equations (BSDEs in short) which are very useful theoretic tools to deal with many financial problems ranging from option pricing option to risk management. Our algorithm based ... More
First-Principles Determination of Electron-Ion Couplings in the Warm Dense Matter RegimeApr 09 2019We present first-principles calculations of the rate of energy exchanges between electrons and ions in nonequilibrium warm dense plasmas, liquid metals and hot solids, a fundamental property for which various models offer diverging predictions. To this ... More
Level density of a Fermi gas and integer partitions: a Gumbel-like finite-size correctionJan 29 2010Mar 20 2010We investigate the many-body level density of gas of non-interacting fermions. We determine its behavior as a function of the temperature and the number of particles. As the temperature increases, and beyond the usual Sommerfeld expansion that describes ... More
On the ground--state energy of finite Fermi systemsMar 02 2007Sep 04 2007We study the ground--state shell correction energy of a fermionic gas in a mean--field approximation. Considering the particular case of 3D harmonic trapping potentials, we show the rich variety of different behaviors (erratic, regular, supershells) that ... More
The Inhomogeneous Gaussian Free Field, with application to ground state correlations of trapped 1d Bose gasesDec 14 2017May 16 2018Motivated by the calculation of correlation functions in inhomogeneous one-dimensional (1d) quantum systems, the 2d Inhomogeneous Gaussian Free Field (IGFF) is studied and solved. The IGFF is defined in a domain $\Omega \subset \mathbb{R}^2$ equipped ... More
One-particle density matrix of trapped one-dimensional impenetrable bosons from conformal invarianceJan 09 2017Apr 05 2017The one-particle density matrix of the one-dimensional Tonks-Girardeau gas with inhomogeneous density profile is calculated, thanks to a recent observation that relates this system to a two-dimensional conformal field theory in curved space. The result ... More
Radial orbit instability as a dissipation-induced phenomenonMar 11 2010Nov 30 2010This paper is devoted to Radial Orbit Instability in the context of self-gravitating dynamical systems. We present this instability in the new frame of Dissipation-Induced Instability theory. This allows us to obtain a rather simple proof based on energetics ... More
Continuous Vernier filtering of an optical frequency comb for broadband cavity-enhanced molecular spectroscopyMar 09 2016We have recently introduced the Vernier-based Direct Frequency Comb Cavity-Enhanced Spectroscopy technique and we present the corresponding formalism for quantitative broadband spectroscopy. We achieve high sensitivity and broadband performance by acquiring ... More
The convergence Newton polygon of a p-adic differential equation II: Continuity and finiteness on Berkovich curvesSep 17 2012We study the variation of the convergence Newton polygon of a differential equation along a smooth Berkovich curve over a non-archimedean complete valued field of characteristic 0. Relying on work of the second author who investigated its properties on ... More
Evaluating the Dynamic Behavior of Database ApplicationsJan 02 2017This paper explores the effect that changing access patterns has on the performance of database management systems. Changes in access patterns play an important role in determining the efficiency of key performance optimization techniques, such as dynamic ... More
Facilitated diffusion framework for transcription factor search with conformational changesJul 09 2015Cellular responses often require the fast activation or repression of specific genes, which depends on Transcription Factors (TFs) that have to quickly find the promoters of these genes within a large genome. Transcription Factors (TFs) search for their ... More