Searching Arxiv, refresh for possibly better results.

total 4896took 0.14s

`Project & Excite' Modules for Segmentation of Volumetric Medical ScansJun 11 2019Jun 12 2019Fully Convolutional Neural Networks (F-CNNs) achieve state-of-the-art performance for image segmentation in medical imaging. Recently, squeeze and excitation (SE) modules and variations thereof have been introduced to recalibrate feature maps channel- ... More

Estimation of Minkowski tensors from digital grey-scale imagesJan 30 2014It has been shown that local algorithms based on grey-scale images sometimes lead to asymptotically unbiased estimators for surface area and integrated mean curvature. This paper extends the results to estimators for Minkowski tensors. In particular, ... More

Estimation of intrinsic volumes from digital grey-scale imagesSep 16 2013Local algorithms are common tools for estimating intrinsic volumes from black-and-white digital images. However, these algorithms are typically biased in the design based setting, even when the resolution tends to infinity. Moreover, images recorded in ... More

Continuity of the Mackey-Higson bijectionJan 01 2019When $G$ is a real reductive group and $G_0$ is its Cartan motion group, the Mackey-Higson bijection is a natural one-to-one correspondence between all irreducible tempered representations of $G$ and all irreducible unitary representations of $G_0$. In ... More

Local digital algorithms applied to Boolean modelsNov 03 2015We investigate the estimation of specific intrinsic volumes of stationary Boolean models by local digital algorithms; that is, by weighted sums of $n \times\ldots \times n$ configuration counts. We show that asymptotically unbiased estimators for the ... More

A geometric interpretation of the homotopy groups of the cobordism categoryAug 16 2012The classifying space of the embedded cobordism category has been identified in by Galatius, Tillmann, Madsen, and Weiss as the infinite loop space of a certain Thom spectrum. This identifies the set of path components with the classical cobordism group. ... More

Random sampling of long-memory stationary processeOct 09 2008This paper investigates the second order properties of a stationary process after random sampling. While a short memory process gives always rise to a short memory one, we prove that long-memory can disappear when the sampling law has heavy enough tails. ... More

Character Sheaves and Depth-zero representationsNov 22 2005Apr 23 2006In this paper we provide a geometric framework for the study of characters of depth-zero representations of unramified groups over local fields with finite residue fields which is built directly on Lusztig's theory of character sheaves for groups over ... More

Affine Hecke algebras for Langlands parametersJan 13 2017May 16 2018It is well-known that affine Hecke algebras are very useful to describe the smooth representations of any connected reductive p-adic group G, in terms of the supercuspidal representations of its Levi subgroups. The goal of this paper is to create a similar ... More

Localisation de faisceaux caractèresOct 28 2008Nous obtenons une formule pour les valeurs de la fonction caract\'eristique d'un faisceau caract\`ere en fonction de la th\'eorie des repr\'esentations de certains groupes finis, li\'es au groupe de Weyl. Cette formule, qui g\'en\'eralise des r\'esultats ... More

Rotational Crofton formulae for Minkowski tensors and some affine counterpartsOct 13 2016Motivated by applications in local stereology, a new rotational Crofton formula is derived for Minkowski tensors. For sets of positive reach, the formula shows how rotational averages of intrinsically defined Minkowski tensors on sections passing through ... More

Generalizations of the Springer correspondence and cuspidal Langlands parametersNov 17 2015Jul 22 2017Let H be any reductive p-adic group. We introduce a notion of cuspidality for enhanced Langlands parameters for H, which conjecturally puts supercuspidal H-representations in bijection with such L-parameters. We also define a cuspidal support map and ... More

Extended quotients in the principal series of reductive p-adic groupsOct 30 2011The geometric conjecture developed by the authors in [1,2,3,4] applies to the smooth dual Irr(G) of any reductive p-adic group G. It predicts a definite geometric structure - the structure of an extended quotient - for each component in the Bernstein ... More

Kazhdan-Lusztig parameters and extended quotientsFeb 21 2011The Kazhdan-Lusztig parameters are important parameters in the representation theory of $p$-adic groups and affine Hecke algebras. We show that the Kazhdan-Lusztig parameters have a definite geometric structure, namely that of the extended quotient $T//W$ ... More

Cycles in the chamber homology of GL(3)Oct 06 2004Apr 22 2006Let F be a nonarchimedean local field and let GL(N) = GL(N,F). We prove the existence of parahoric types for GL(N). We construct representative cycles in all the homology classes of the chamber homology of GL(3).

Stiffness of finite free resolutions and the Canonical Element ConjectureJan 23 2003Over a noetherian local ring certain minimal finite free resolutions possess a property which we call stiffness. This calls to mind the Buchsbaum-Eisenbud criterion for exactness. Yet we only prove stiffness over equicharacteristic rings. However, Hochster's ... More

`Project & Excite' Modules for Segmentation of Volumetric Medical ScansJun 11 2019Fully Convolutional Neural Networks (F-CNNs) achieve state-of-the-art performance for image segmentation in medical imaging. Recently, squeeze and excitation (SE) modules and variations thereof have been introduced to recalibrate feature maps channel- ... More

Comparison of different exoplanet mass detection limit methods using a sample of main-sequence intermediate-type starsJul 18 2012The radial velocity (RV) technique is a powerful tool for detecting extrasolar planets and deriving mass detection limits that are useful for constraining planet pulsations and formation models. Detection limit methods must take into account the temporal ... More

Model selection in logistic regressionAug 30 2015This paper is devoted to model selection in logistic regression. We extend the model selection principle introduced by Birg\'e and Massart (2001) to logistic regression model. This selection is done by using penalized maximum likelihood criteria. We propose ... More

Lightweight Call-Graph Construction for Multilingual Software AnalysisAug 03 2018Analysis of multilingual codebases is a topic of increasing importance. In prior work, we have proposed the MLSA (MultiLingual Software Analysis) architecture, an approach to the lightweight analysis of multilingual codebases, and have shown how it can ... More

Thinning of the Sun's magnetic layer: the peculiar solar minimum could have been predictedAug 27 2012The solar magnetic activity cycle causes changes in the Sun on timescales that are relevant to human lifetimes. The minimum in solar activity that preceded the current solar cycle (cycle 24) was deeper and quieter than any other recent minimum. Using ... More

Bacterial fitness shapes the population dynamics of antibiotic-resistant and -susceptible bacteria in a model of combined antibiotic and anti-virulence treatmentSep 15 2014Bacterial resistance to antibiotic treatment is a huge concern: introduction of any new antibiotic is shortly followed by the emergence of resistant bacterial isolates in the clinic. This issue is compounded by a severe lack of new antibiotics reaching ... More

Geometric structure for the principal series of a split reductive $p$-adic group with connected centreAug 04 2014Apr 12 2016Let $\mathcal{G}$ be a split reductive $p$-adic group with connected centre. We show that each Bernstein block in the principal series of $\mathcal{G}$ admits a definite geometric structure, namely that of an extended quotient. For the Iwahori-spherical ... More

Smooth Duals of Inner Forms of $GL_n$ and $SL_n$May 17 2015Apr 05 2019Let $F$ be a non-archimedean local field. We prove that every Bernstein component in the smooth dual of each inner form of the general linear group $GL_n(F)$ is canonically in bijection with the extended quotient for the action, given by Bernstein, of ... More

How can we improve problem-solving in undergraduate biology? Applying lessons from 30 years of physics education researchSep 04 2012Feb 25 2013If students are to successfully grapple with authentic, complex biological problems as scientists and citizens, they need practice solving such problems during their undergraduate years. Physics education researchers have investigated student problem ... More

Quicker ADC : Unlocking the hidden potential of Product Quantization with SIMDDec 21 2018Efficient Nearest Neighbor (NN) search in high-dimensional spaces is a foundation of many multimedia retrieval systems. A common approach is to rely on Product Quantization that allows storing large vector databases in memory and also allows efficient ... More

On $L$-packets and depth for $SL_2(K)$ and its inner formOct 09 2016We consider the group $SL_2(K)$, where $K$ is a local non-archimedean field of characteristic two. We prove that the depth of any irreducible representation of $SL_2 (K)$ is larger than the depth of the corresponding Langlands parameter, with equality ... More

The local Langlands correspondence for inner forms of $SL_n$May 12 2013Mar 07 2014Let F be a non-archimedean local field. We establish the local Langlands correspondence for all inner forms of the group $SL_n (F)$. It takes the form of a bijection between, on the one hand, conjugacy classes of Langlands parameters for $SL_n (F)$ enhanced ... More

On Cuspidal Representations of General Linear Groups over Discrete Valuation RingsJun 01 2007Jul 14 2008We define a new notion of cuspidality for representations of $\GL_n$ over a finite quotient $\Oh_k$ of the ring of integers $\Oh$ of a non-Archimedean local field $F$ using geometric and infinitesimal induction functors, which involve automorphism groups ... More

Derived Codebooks for High-Accuracy Nearest Neighbor SearchMay 16 2019High-dimensional Nearest Neighbor (NN) search is central in multimedia search systems. Product Quantization (PQ) is a widespread NN search technique which has a high performance and good scalability. PQ compresses high-dimensional vectors into compact ... More

Neuropeptide Y and its involvement in chronic painNov 24 2017Chronic pain is a serious condition that significantly impairs the quality of life, affecting an estimate of 1.5 billion people worldwide. Despite the physiological, emotional and financial burden of chronic pain, there is still a lack of efficient treatments. ... More

The spectrum of the B[e] star BAL224Oct 24 2005We present optical spectroscopy of the emission line star BAL 224 (V=17.3, B-V=0.46). This star also named KWBBE 485, [MA93]906 is located at the periphery of the young SMC cluster NGC 330; it is known as a photometric variable with a possible period ... More

Vibrating Black Holes in f(R) gravityAug 01 2014Aug 18 2014We consider general perturbations of a Schwarzschild black holes in the context of f(R) gravity. A reduced set of frame independent master variables are determined, which obey two closed wave equations - one for the transverse, trace-free (tensor) perturbations ... More

Buchdahl-Bondi limit in modified gravity: Packing extra effective mass in relativistic compact starsJun 12 2015We generalise the Buchdahl-Bondi limit for the case of static, spherically symmetric, relativistic compact stars immersed in Schwarzschild vacuum in f(R)-theory of gravity, subject to very generic regularity, thermodynamic stability and matching conditions. ... More

Jebsen-Birkhoff theorem and its stability in f(R) gravityDec 24 2013We prove a Jebsen-Birkhoff like theorem for f(R) theories of gravity in order to to find the necessary conditions required for the existence of the Schwarzschild solution in these theories and demonstrate that the rigidity of such solutions of f(R) gravity ... More

Seismic Site Effects for Shallow and Deep Alluvial Basins: In-Depth Motion and Focusing EffectAug 19 2009The main purpose of the paper is the analysis of seismic site effects in various alluvial basins. The analysis is performed considering a numerical approach (Boundary Element Method). Two main cases are considered : a shallow deposit in the centre of ... More

Identification of the Isotherm Function in Chromatography Using CMA-ESOct 01 2007This paper deals with the identification of the flux for a system of conservation laws in the specific example of analytic chromatography. The fundamental equations of chromatographic process are highly non linear. The state-of-the-art Evolution Strategy, ... More

GCP: Gossip-based Code Propagation for Large-scale Mobile Wireless Sensor NetworksJul 25 2007Jul 30 2007Wireless sensor networks (WSN) have recently received an increasing interest. They are now expected to be deployed for long periods of time, thus requiring software updates. Updating the software code automatically on a huge number of sensors is a tremendous ... More

MaNGA: Mapping Nearby Galaxies at Apache Point ObservatoryAug 18 2015MaNGA (Mapping Nearby Galaxies at APO) is a galaxy integral-field spectroscopic survey within the fourth generation Sloan Digital Sky Survey (SDSS-IV). It will be mapping the composition and kinematics of gas and stars in 10,000 nearby galaxies, using ... More

Limiting the Spread of Fake News on Social Media Platforms by Evaluating Users' TrustworthinessAug 29 2018Today's social media platforms enable to spread both authentic and fake news very quickly. Some approaches have been proposed to automatically detect such "fake" news based on their content, but it is difficult to agree on universal criteria of authenticity ... More

Night sleep duration trajectories and associated factors among preschool children from the EDEN cohortApr 10 2019Objective. Sleep duration may vary inter-individually and intra-individually over time. We aimed at both identifying night-sleep duration (NSD) trajectories among preschoolers and studying associated factors. Methods. NSD were collected within the French ... More

Magnetic and pair correlations of the Hubbard model with next-nearest-neighbor hoppingJul 14 1995A combination of analytical approaches and quantum Monte Carlo simulations is used to study both magnetic and pairing correlations for a version of the Hubbard model that includes second-neighbor hopping $t^{\prime }=-0.35t$ as a model for high-temperature ... More

Differences between the current solar minimum and earlier minimaMar 22 2010The Birmingham Solar-Oscillations Network (BiSON) has collected helioseismic data over three solar cycles. We use these data to determine how the internal properties of the Sun during this minimum differ from the previous two minima. The cycle 24 data ... More

Testing goodness of fit for point processes via topological data analysisJun 18 2019We introduce tests for the goodness of fit of point patterns via methods from topological data analysis. More precisely, the persistent Betti numbers give rise to a bivariate functional summary statistic for observed point patterns that is asymptotically ... More

Numerical approximation of the 3d hydrostatic Navier-Stokes system with free surfaceSep 19 2017Nov 19 2018In this paper we propose a stable and robust strategy to approximate the 3d incompressible hydrostatic Euler and Navier-Stokes systems with free surface. Compared to shallow water approximation of the Navier-Stokes system, the idea is to use a Galerkin ... More

Be stars in open clusters in the Small Magellanic CloudSep 25 2006We report on the study of the population of B and Be stars in SMC young clusters, performed with the Wide Field Imager in slitless spectroscopic mode at ESO/T2.2m with a filter centered at Halpha. First, we explain the reduction methods we used and our ... More

B and Be stars in the Magellanic Clouds: rotation, evolution and variabilityOct 24 2005Thanks to observations at the ESO VLT with the GIRAFFE multifibers spectrograph, we have obtained spectra of 177 and 346 B-type stars in the Large and Small Magellanic Clouds respectively. We have discovered 25 and 90 new Be stars among the 47 and 131 ... More

Site-City Interaction through Modifications of Site EffectsAug 19 2009The analysis of seismic site effects generally disregards the influence of surface structures on the free field motion in densely urbanized areas. This paper aims at investigating this particular problem called site-city interaction especially by comparison ... More

On Shear-Free perturbations of FLRW UniversesJul 27 2011A surprising exact result for the Einstein Field Equations is that if pressure-free matter is moving in a shear-free way, then it must be either expansion-free or rotation-free. It has been suggested this result is also true for any barotropic perfect ... More

Un-interrupted Sun-as-a-star Helioseismic Observations over Multiple Solar CyclesMay 14 2018We analyze Sun-as-a-star observations spanning over solar cycles 22 -- 24 from the ground-based network BiSON and solar cycles 23 -- 24 collected by the space-based VIRGO and GOLF instruments on board the {\it SoHO} satellite. Using simultaneous observations ... More

A seismic signature of a second dynamo?Jun 22 2010The Sun is a variable star whose magnetic activity varies most perceptibly on a timescale of approximately 11 years. However, significant variation is also observed on much shorter timescales. We observe a quasi-biennial (2 year) signal in the natural ... More

Metaheuristics in Flood Disaster Management and Risk AssessmentJun 26 2013A conceptual area is divided into units or barangays, each was allowed to evolve under a physical constraint. A risk assessment method was then used to identify the flood risk in each community using the following risk factors: the area's urbanized area ... More

COGEVIS: A New Scale to Evaluate Cognition in Patients with Visual DeficiencyDec 18 2018We evaluated the cognitive status of visually impaired patients referred to low vision rehabilitation (LVR) based on a standard cognitive battery and a new evaluation tool, named the COGEVIS, which can be used to assess patients with severe visual deficits. ... More

An independent determination of Fomalhaut b's orbit and the dynamical effects on the outer dust beltNov 20 2013The nearby star Fomalhaut harbours a cold, moderately eccentric dust belt with a sharp inner edge near 133 au. A low-mass, common proper motion companion (Fom b), was discovered near the inner edge and was identified as a planet candidate that could account ... More

Bandwidth-driven nature of the pressure-induced metal state of LaMnO3Oct 12 2011Using X-ray absorption spectroscopy (XAS), we studied the local structure in LaMnO3 under applied pressure across and well above the insulator to metal (IM) transition. A hysteretic behavior points to the coexistence of two phases within a large pressure ... More

Anatomy of the vertebral column lymphatic network in miceJan 12 2019Cranial lymphatic vessels (LVs) are involved in transport of fluids, macromolecules and CNS immune responses. Little information about spinal LVs is available, because these delicate structures are embedded within vertebral tissues and difficult to visualize ... More

On the behaviour of B and Be stars at low metallicitySep 18 2007Sep 19 2007We present new results obtained with the VLT GIRAFFE for a large sample of B and Be stars belonging to the Magellanic Clouds, i.e. at low metallicity. First, we show the effects of the metallicity of the environment on their rotation (linear, angular, ... More

Are short-term variations in solar oscillation frequencies the signature of a second solar dynamo?Dec 22 2010In addition to the well-known 11-year solar cycle, the Sun's magnetic activity also shows significant variation on shorter time scales, e.g. between one and two years. We observe a quasi-biennial (2-year) signal in the solar p-mode oscillation frequencies, ... More

Search for photon oscillations into massive particlesAug 20 2008In this paper, we present the final results of our experiment on photon-axion oscillations in the presence of a magnetic field, which took place at LULI (Laboratoire pour l'Utilisation des Lasers Intenses, Palaiseau, France). Our null measurement allowed ... More

X-ray Linear Dichroism in cubic compounds: the case of Cr3+ in MgAl2O4Jun 10 2008The angular dependence (x-ray linear dichroism) of the Cr K pre-edge in MgAl2O4:Cr3+ spinel is measured by means of x-ray absorption near edge structure spectroscopy (XANES) and compared to calculations based on density functional theory (DFT) and ligand ... More

An inversion in the wiring of an intercellular signal: evolution of Wnt signaling in the nematode vulvaAug 02 2005Signal transduction pathways are largely conserved throughout the animal kingdom. The repertoire of pathways is limited and each pathway is used in different intercellular signaling events during the development of a given animal. For example, Wnt signaling ... More

Atomic Parity Violation. Early days, present results, prospectsNov 09 2011This is a personal recollection of the time when the search for APV was beginning. In spite of today's remarkable results, summarized here, there are still important goals to be achieved. I indicate a possible way to tackle the remaining experimental ... More

Topological Self-Stabilization with Name-Passing Process CalculiApr 14 2016Topological self-stabilization describes the ability of a distributed system to let the nodes themselves establish a meaningful overlay network. Independent from the initial network topology, the system converges to the desired topology via forwarding, ... More

Crystal structure on rigged configurationsAug 05 2005Rigged configurations are combinatorial objects originating from the Bethe Ansatz, that label highest weight crystal elements. In this paper a new unrestricted set of rigged configurations is introduced for types ADE by constructing a crystal structure ... More

How to Verify a Quantum ComputationSep 30 2015Jun 22 2018We give a new theoretical solution to a leading-edge experimental challenge, namely to the verification of quantum computations in the regime of high computational complexity. Our results are given in the language of quantum interactive proof systems. ... More

$L_\infty$-interpretation of a classification of deformations of Poisson structures in dimension threeApr 06 2009Aug 07 2009We give an $L_\infty$-interpretation of the classification, obtained in [AP2], of the formal deformations of a family of exact Poisson structures in dimension three. We indeed obtain again the explicit formulas for all the formal deformations of these ... More

Linear Stark Shifts to Measure the Fr Weak Nuclear Charge with Small Atom SamplesNov 02 2007Nov 05 2007We study the chirality of ground-state alkali atoms in E and B fields, dressed with a circularly-polarized laser beam close-detuned from an E-field-assisted forbidden transition, such as 7S-8S in Fr. We predict a parity violating energy shift of their ... More

Asymptotic variance of grey-scale surface area estimatorsJan 04 2014Feb 10 2014Grey-scale local algorithms have been suggested as a fast way of estimating surface area from grey-scale digital images. Their asymptotic mean has already been described. In this paper, the asymptotic behaviour of the variance is studied in isotropic ... More

Local digital estimators of intrinsic volumes for Boolean models and in the design based settingOct 07 2013In order to estimate the specific intrinsic volumes of a planar Boolean model from a binary image, we consider local digital algorithms based on weighted sums of $2\times 2$ configuration counts. For Boolean models with balls as grains, explicit formulas ... More

Local digital algorithms for estimating the integrated mean curvature of r-regular setsSep 16 2013Oct 07 2013Consider the design based situation where an $r$-regular set is sampled on a random lattice. A fast algorithm for estimating the integrated mean curvature based on this observation is to use a weighted sum of $2\times \dotsm \times 2$ configuration counts. ... More

Holonomic quantum logic gatesFeb 19 2002This is a brief overview of quantum holonomies in the context of quantum computation. We choose an adequate set of quantum logic gates, namely, a phase gate, the Hadamard gate, and a conditional-phase gate and show how they can be implemented by purely ... More

Singular Equations Driven by an Additive Noise and ApplicationsJun 09 2014Sep 02 2015In the pathwise stochastic calculus framework, the paper deals with the general study of equations driven by an additive Gaussian noise, with a drift function having an infinite limit at point zero. An ergodic theorem and the convergence of the implicit ... More

Conjugate Pairs of Subfactors and Entropy for AutomorphismsFeb 03 2010Based on the fact that, for a subfactor $N$ of a II$_1$ factor $M,$ the first non-trivial Jones index is 2 and then $M$ is decomposed as the crossed product of $N$ by an outer action of ${\mathbb{Z}}_2,$ we study pairs $ \{N, uNu^* \}$ from a view point ... More

A probabilistic branching bisimulation for quantum processesAug 16 2005Full formal descriptions of algorithms making use of quantum principles must take into account both quantum and classical computing components and assemble them so that they communicate and cooperate.Moreover, to model concurrent and distributed quantum ... More

Lattices acting on right-angled buildingsAug 20 2005Apr 21 2009Let X be a right-angled building. We show that the lattices in Aut(X) share many properties with tree lattices. For example, we characterise the set of covolumes of uniform and of nonuniform lattices in Aut(X), and show that the group Aut(X) admits an ... More

Indice et decomposition de Cartan d'une algebre de Lie semi-simple reelleJun 10 2005Jan 29 2007The Iwasawa decomposition $\mathfrak{g}=\mathfrak{k}_0 \oplus \hat{\mathfrak{a}}_0 \oplus \mathfrak{n}_0$ of the real semisimple Lie algebra $\mathfrak{g}_0$ comes from its Cartan decomposition $\mathfrak{g}_0=\mathfrak{k}_0 \oplus \mathfrak{p}_0$. Then ... More

Richard Stanley through a crystal lens and from a random angleMay 12 2014Aug 28 2014We review Stanley's seminal work on the number of reduced words of the longest element of the symmetric group and his Stanley symmetric functions. We shed new light on this by giving a crystal theoretic interpretation in terms of decreasing factorizations ... More

A linear Stark shift in dressed atoms as a signal to measure a nuclear anapole moment with a cold atom fountain or interferometerNov 03 2006We demonstrate theoretically the existence of a linear dc Stark shift of the individual substates of an alkali atom in its ground state, dressed by a circularly polarized laser field. It arises from the electroweak nuclear anapole moment violating P but ... More

On lattices of maximal index twoJun 04 2008The maximal index of a Euclidean lattice L of dimension n is the maximal index of the sub-lattices of L spanned by n independent minimal vectors of L. In this paper, we prove that a perfect lattice of maximal index two not provided by a cross-section ... More

On multigrid convergence of local algorithms for intrinsic volumesOct 07 2013Local digital algorithms based on $n\times \dots \times n$ configuration counts are commonly used within science for estimating intrinsic volumes from binary images. This paper investigates multigrid convergence of such algorithms. It is shown that local ... More

Nanoscale distribution of magnetic anisotropies in bimagnetic soft core-hard shell MnFe$_2$O$_4$@CoFe$_2$O$_4$ nanoparticlesOct 13 2016Sep 14 2017The nanoscale distribution of magnetic anisotropies was measured in core@shell MnFe$_2$O$_4$@CoFe$_2$O$_4$ 7.0 nm particles using a combination of element selective magnetic spectroscopies with different probing depths. As this picture is not accessible ... More

Studying Jets with Identified Particles in PHENIXSep 22 2006A surprising excess of protons at intermediate $p_T$, 2-5GeV/c, has been observed in Au+Au collisions at RHIC, for which the source is not known. In p+p collisions, particles at this $p_T$ arise from jet fragmentation, however the observed baryon yield ... More

A fast subspace optimization method for nonlinear inverse problems in Banach spaces with an application in parameter identificationJan 16 2018We introduce and analyze a fast iterative method based on sequential Bregman projections for nonlinear inverse problems in Banach spaces. The key idea, in contrast to the standard Landweber method, is to use multiple search directions per iteration in ... More

There is a VaR beyond usual approximationsNov 01 2013Basel II and Solvency 2 both use the Value-at-Risk (VaR) as the risk measure to compute the Capital Requirements. In practice, to calibrate the VaR, a normal approximation is often chosen for the unknown distribution of the yearly log returns of financial ... More

Zeta-polynomials, Hilbert polynomials, and the Eichler-Shimura identitiesApr 11 2019In 2017, Ono, Rolen, and Sprung [ORS17] answered problems of Manin [Man16] by defining zeta-polynomials $Z_f(s)$ for even weight newforms $f\in S_k(\Gamma_0(N)$; these polynomials can be defined by applying the "Rodriguez-Villegas transform" to the period ... More

Ergodicity of a Generalized Jacobi's Equation and ApplicationsAug 22 2013Sep 02 2015Consider a $1$-dimensional centered Gaussian process $W$ with $\alpha$-H\"older continuous paths on the compact intervals of $\mathbb R_+$ ($\alpha\in ]0,1[$) and $W_0 = 0$, and $X$ the local solution in rough paths sense of Jacobi's equation driven by ... More

Regularity in the Obstacle Problem for Parabolic Non-divergence Operators of Hörmander typeOct 16 2012In this paper we continue the study initiated in [FGN] concerning the obstacle problem for a class of parabolic non-divergence operators structured on a set of vector fields X = {X_1,...,X_q} in R^n with C^1-coefficients satisfying H\"ormander's finite ... More

von Neumann entropy and relative position between subalgebrasJul 07 2010We give a numerical characterization of mutual orthogonality (that is, complementarity) for subalgebras. In order to give such a characterization for mutually orthogonal subalgebras $A$ and $B$ of the $k \times k$ matrix algebra $M_k(\mathbb{C})$, where ... More

A note on the enumeration of directed animals via gas considerationsMay 09 2008Oct 21 2009In the literature, most of the results about the enumeration of directed animals on lattices via gas considerations are obtained by a formal passage to the limit of enumeration of directed animals on cyclical versions of the lattice. Here we provide a ... More

Spectroscopic Constraints on the Build-up of the Intracluster Light in the Coma ClusterOct 31 2018The stellar content of the intracluster light (ICL) provides unique insight into the hierarchical assembly process of galaxy clusters.However, the ICL is difficult to study due to its low surface brightness and large physical extent. We present optical ... More

SDSS IV MaNGA: Characterizing Non-Axisymmetric Motions in Galaxy Velocity Fields Using the Radon TransformJul 30 2018Aug 06 2018We show how the Radon transform (defined as a series of line integrals through an image at different orientations and offsets from the origin) can be used as a simple, non-parametric tool to characterize galaxy velocity fields, specifically their global ... More

Rewriting as a Special Case of Noncommutative Groebner Basis TheoryJan 11 1999Rewriting for semigroups is a special case of Groebner basis theory for noncommutative polynomial algebras. The fact is a kind of folklore but is not fully recognised. The aim of this paper is to elucidate this relationship, showing that the noncommutative ... More

Applications of Rewriting Systems and Groebner Bases to Computing Kan Extensions and Identities Among RelationsDec 17 1998Mar 22 2000This thesis concentrates on the development and application of rewriting and Groebner basis methods to a range of combinatorial problems. Chapter Two contains the most important result, which is the application of Knuth-Bendix procedures to Kan extensions, ... More

Plancherel measure for GL(n,F) and GL(m,D): explicit formulas and Bernstein decompositionFeb 14 2003Oct 04 2004Let F be a nonarchimedean local field, let D be a division algebra over F, let GL(n) = GL(n,F). Let \nu denote Plancherel measure for GL(n). Each component \Omega in the Bernstein variety \Omega(GL(n)) has several numerical invariants attached to it. ... More

Codes for optically thick and hot photoionized media - Radiative transfer and new developmentsMar 20 2001We describe a code designed for hot media {(T $\ge$} a few 10$^4$ K), optically thick to Compton scattering. It computes the structure of a plane-parallel slab of gas in thermal and ionization equilibrium, illuminated on one side or on both sides by a ... More

Spin-orbit inclinations of the exoplanetary systems HAT-P-8, HAT-P-9, HAT-P-16 and HAT-P-23May 19 2011We report the measurement of the spin-orbit angle of the extra-solar planets HAT-P-8 b, HAT-P-9 b, HAT-P-16 b and HAT-P-23 b, thanks to spectroscopic observations performed at the Observatoire de Haute-Provence with the SOPHIE spectrograph on the 1.93-m ... More

SOPHIE velocimetry of Kepler transit candidates. I. Detection of the low-mass white dwarf KOI-74bSep 09 2010Oct 27 2010The Kepler mission has detected transits and occultations of a hot compact object around an early-type star, the Kepler Object of Interest KOI 74. The mass of this transiting object was photometrically assessed in a previous study using the presence of ... More

Operational extreme points of unital completely positive mapsFeb 01 2016Feb 11 2016Two notions for linear maps (operational convex combinations and operational exetreme points) are introduced. The set S of ucp maps on the n times n matrix algebra is the operational convex combinations of the identity map. An operational extreme point ... More

On a Constrained Fractional Stochastic Volatility ModelAug 11 2016Aug 28 2016This paper deals with an extension of the so-called Black-Scholes model in which the volatility is modeled by a linear combination of the components of the solution of a differential equation driven by a fractional Brownian motion of Hurst parameter greater ... More

A Compositional Treatment of Polysemous Arguments in Categorial GrammarAug 02 1995Sep 10 1995We discuss an extension of the standard logical rules (functional application and abstraction) in Categorial Grammar (CG), in order to deal with some specific cases of polysemy. We borrow from Generative Lexicon theory which proposes the mechanism of ... More