Results for "Daniela De Canditiis"

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Estimation of delta-contaminated density of the random intensity of Poisson dataSep 01 2015In the present paper, we constructed an estimator of a delta contaminated mixing density function $g(\lambda)$ of the intensity $\lambda$ of the Poisson distribution. The estimator is based on an expansion of the continuous portion $g_0(\lambda)$ of the ... More
Learning Gaussian Graphical Models by symmetric parallel regression techniqueFeb 08 2019In this contribution we deal with the problem of learning an undirected graph which encodes the conditional dependence relationship between variables of a complex system, given a set of observations of this system. This is a very central problem of modern ... More
Simultaneous nonparametric regression in RADWT dictionariesFeb 08 2019A new technique for nonparametric regression of multichannel signals is presented. The technique is based on the use of the Rational-Dilation Wavelet Transform (RADWT), equipped with a tunable Q-factor able to provide sparse representations of functions ... More
Solution of linear ill-posed problems by model selection and aggregationOct 30 2017We consider a general statistical linear inverse problem, where the solution is represented via a known (possibly overcomplete) dictionary that allows its sparse representation. We propose two different approaches. A model selection estimator selects ... More
Bernstein-type techniques for 2D free boundary graphsDec 15 2006We prove an a-priori bound for the Lipschitz constant of a smooth one-phase free boundary graph F(u) in two dimensions. The function u satisfies a fully nonlinear elliptic equation in its positive side, and the gradient of u is equal to 1 on F(u).
De-noising procedures for frame operatorsJan 16 2013The present paper provides a comprehensive study of de-noising properties of frames and, in particular, tight frames, which constitute one of the most popular tools in contemporary signal processing. The objective of the paper is to bridge the existing ... More
The Dirichlet problem for singular elliptic equations with general nonlinearitiesJan 10 2018In this paper, under very general assumptions, we prove existence and regularity of distributional solutions to homogeneous Dirichlet problems of the form $$\begin{cases} \displaystyle - \Delta_{1} u = h(u)f & \text{in}\, \Omega,\newline u\geq 0& \text{in}\ ... More
Evidence synthesis for stochastic epidemic modelsJun 08 2017In recent years the role of epidemic models in informing public health policies has progressively grown. Models have become increasingly realistic and more complex, requiring the use of multiple data sources to estimate all quantities of interest. This ... More
Value of Information: Sensitivity Analysis and Research Design in Bayesian Evidence SynthesisMar 27 2017Suppose we have a Bayesian model which combines evidence from several different sources. We want to know which model parameters most affect the estimate or decision from the model, or which of the parameter uncertainties drive the decision uncertainty. ... More
Global Well-Posedness for the $L^2$-critical nonlinear Schrödinger equation in higher dimensionsJul 25 2006The initial value problem for the $L^{2}$ critical semilinear Schr\"odinger equation in $\R^n, n \geq 3$ is considered. We show that the problem is globally well posed in $H^{s}({\Bbb R^{n}})$ when $1>s>\frac{\sqrt{7}-1}{3}$ for $n=3$, and when $1>s> ... More
MultiBUGS: A parallel implementation of the BUGS modelling framework for faster Bayesian inferenceApr 11 2017Nov 29 2018MultiBUGS (https://www.multibugs.org) is a new version of the general-purpose Bayesian modelling software BUGS that implements a generic algorithm for parallelising Markov chain Monte Carlo (MCMC) algorithms to speed up posterior inference of Bayesian ... More
A Characterization Theorem for Local Operators in Factorizing Scattering ModelsNov 15 2012In quantum field theory, the rigorous construction of local observables in the presence of nontrivial interaction is a crucial problem. In a class of integrable quantum field theories, a very abstract existence proof has recently been given by Lechner. ... More
Asymptotic behaviour of the simple random walk on the 2-combMay 29 2006We analyze the differences between the horizontal and the vertical component of the simple random walk on the 2-dimensional comb. In particular we evaluate by combinatorial methods the asymptotic behaviour of the expected value of the distance from the ... More
Wedge-local fields in interacting quantum field theories with bound statesAug 28 2016Aug 30 2016In the context of constructing interacting quantum field theories in the operator-algebraic approach, wedge-local fields play an important role. After the work of Lechner to construct factorizing scattering matrix models with scalar S-matrices without ... More
Critical sets of bounded analytic functions, zero sets of Bergman spaces and nonpositive curvatureOct 03 2011A classical result due to Blaschke states that for every analytic self-map $f$ of the open unit disk of the complex plane there exists a Blaschke product $B$ such that the zero sets of $f$ and $B$ agree. In this paper we show that there is an analogue ... More
Coherent transport in extremely underdoped Nd1.2Ba1.8Cu3Oz nanostructuresJul 20 2012Proximity-effect and resistance magneto-fluctuations measurements in submicron Nd1.2Ba1.8Cu3Oz (NBCO) nano-loops are reported to investigate coherent charge transport in the non-superconducting state. We find an unexpected inhibition of cooper pair transport, ... More
Modeling the amorphous structure of a mechanically alloyed Ti50Ni25Cu25 alloy using anomalous wide-angle x-ray scattering and reverse Monte Carlo simulationsApr 16 2013An amorphous Ti50Ni25Cu25 alloy was produced by 19 h of mechanical alloying. Anomalous wide angle x-ray scattering data were collected at six energies and six total scattering factors were obtained. By considering the data collected at two energies close ... More
Multi-Channel Access Solutions for 5G New RadioJan 28 2019Mar 13 20195G New Radio paves the way for introducing novel multi-service radio resource management solutions tailored for enhanced Mobile Broadband and Ultra-Reliable Low Latency Communication service classes. Multi-Channel Access is a family of such multi-service ... More
Rumor processes in random environment on N and on Galton-Watson treesMay 29 2013The aim of this paper is to study rumor processes in random environment. In a rumor process a signal starts from the stations of a fixed vertex (the root) and travels on a graph from vertex to vertex. We consider two rumor processes. In the firework process ... More
Boolean lifting property in quantalesJan 18 2019In ring theory, the lifting idempotent property (LIP) is related to some important classes of rings: clean rings, exchange rings, local and semilocal rings, Gelfand rings,maximal rings, etc. Inspired by LIP, there were defined lifting properties for other ... More
An Architecture for Embedded Systems Supporting Assisted LivingAug 01 2018The rise in life expectancy is one of the great achievements of the twentieth century. This phenomenon originates a still increasing interest in Ambient Assisted Living (AAL) technological solutions that may support people in their daily routines allowing ... More
On Posa's conjecture for random graphsMar 28 2012Jul 30 2012The famous Posa conjecture states that every graph of minimum degree at least 2n/3 contains the square of a Hamilton cycle. This has been proved for large n by Koml\'os, Sark\"ozy and Szemer\'edi. Here we prove that if p > n^{-1/2+\eps}, then asymptotically ... More
Curing velocity superselection in non-relativistic QED by restriction to a lightconeFeb 25 2019It is physically expected that plane-wave configurations of the electron in QED induce disjoint representations of the algebra of the electromagnetic fields. This phenomenon of velocity superselection, which is one aspect of the infrared problem, is mathematically ... More
Wedge-local fields in integrable models with bound states II. Diagonal S-matrixJan 26 2016Aug 18 2016We construct candidates for observables in wedge-shaped regions for a class of 1+1-dimensional integrable quantum field theories with bound states whose S-matrix is diagonal, by extending our previous methods for scalar S-matrices. Examples include the ... More
Hamilton decompositions of regular expanders: a proof of Kelly's conjecture for large tournamentsFeb 28 2012May 10 2013A long-standing conjecture of Kelly states that every regular tournament on n vertices can be decomposed into (n-1)/2 edge-disjoint Hamilton cycles. We prove this conjecture for large n. In fact, we prove a far more general result, based on our recent ... More
Branching random walks with uncountably many extinction probability vectorsJun 11 2018Given a branching random walk on a set $X$, we study its extinction probability vectors $\mathbf q(\cdot,A)$. Their components are the probability that the process goes extinct in a fixed $A\subseteq X$, when starting from a vertex $x\in X$. The set of ... More
Decentralized Pliable Index CodingApr 10 2019This paper introduces the ${\it decentralized}$ Pliable Index CODing (PICOD) problem: a variant of the Index Coding (IC) problem, where a central transmitter serves ${\it pliable}$ users with message side information; here, pliable refers to the fact ... More
Synthesising evidence to estimate pandemic (2009) A/H1N1 influenza severity in 2009-2011Aug 29 2014Feb 03 2015Knowledge of the severity of an influenza outbreak is crucial for informing and monitoring appropriate public health responses, both during and after an epidemic. However, case-fatality, case-intensive care admission and case-hospitalisation risks are ... More
Finite oscillator obtained through finite frame quantizationJan 04 2013May 19 2013The Hamiltonian of the harmonic oscillator is usually defined as a differential operator, but an integral representation can be obtained by using the coherent state quantization. The finite frame quantization is a finite counterpart of the coherent state ... More
No Time for Dead Time: Use the Fourier Amplitude Differences to Normalize Dead-time-affected PeriodogramsSep 27 2017Jan 31 2018Dead time affects many of the instruments used in X-ray astronomy, by producing a strong distortion in power density spectra. This can make it difficult to model the aperiodic variability of the source or look for quasi-periodic oscillations. Whereas ... More
Lamb shift in hydrogen-like muonic atoms to test fractal extra dimensionsMar 02 2019From the comparison between the experimental and theoretical results for the energy difference between 2s1/2 and 2p1/2 states in hydrogen and hydrogen-like ions with different values of Z, we estimate bounds for the presence of an extra fractional dimension. ... More
Intrinsic Differentiability and Intrinsic Regular Surfaces in Carnot GroupsNov 13 2018A Carnot group G is a connected, simply connected, nilpotent Lie group with stratified Lie algebra. Intrinsic regular surfaces in Carnot groups play the same role as C^1 surfaces in Euclidean spaces. As in Euclidean spaces, intrinsic regular surfaces ... More
Wedge-local fields in integrable models with bound statesFeb 04 2015Sep 24 2017Recently, large families of two-dimensional quantum field theories with factorizing S-matrices have been constructed by the operator-algebraic methods, by first showing the existence of observables localized in wedge-shaped regions. However, these constructions ... More
Negative energy densities in integrable quantum field theories at one-particle levelFeb 05 2015Mar 02 2016We study the phenomenon of negative energy densities in quantum field theories with self-interaction. Specifically, we consider a class of integrable models (including the sinh-Gordon model) in which we investigate the expectation value of the energy ... More
Area preserving maps and volume preserving maps between a class of polyhedrons and a sphereApr 07 2015For a class of polyhedrons denoted $\mathbb K_n(r,\varepsilon)$, we construct a bijective continuous area preserving map from $\mathbb K_n(r,\varepsilon)$ to the sphere $\mathbb S^{2}(r)$, together with its inverse. Then we investigate for which polyhedrons ... More
Group Actions on Riemann-Roch SpaceApr 04 2019Let $ \; G \; $ be a group acting on a compact Riemann surface $ \; {\mathcal X} \; $ and $ \; D \; $ be a $ \; G$-invariant divisor on $\; {\mathcal X}. \; $ The action of $ \; G \; $ on $ \; {\mathcal X} \; $ induces a linear representation $ \; L_G(D) ... More
Gaussian approximation for functionals of Gibbs particle processesJul 21 2017Jan 25 2018In the paper asymptotic properties of functionals of stationary Gibbs particle processes are derived. Two known techniques from the point process theory in the Euclidean space R^d are extended to the space of compact sets on R^d equipped by the Hausdorff ... More
Intrinsic Lipschitz graphs in Carnot groups of step 2Mar 06 2019We focus our attention on the notion of intrinsic Lipschitz graphs, inside a special class of metric spaces i.e. the Carnot groups. More precisely, we provide a characterization of locally intrinsic Lipschitz functions in Carnot groups of step 2 in terms ... More
Superdense galaxies and the mass-size relation at low redshiftNov 05 2012We search for massive and compact galaxies (superdense galaxies, hereafter SDGs) at z=0.03-0.11 in the Padova-Millennium Galaxy and Group Catalogue, a spectroscopically complete sample representative of the local Universe general field population. We ... More
Acceleration of univariate global optimization algorithms working with Lipschitz functions and Lipschitz first derivativesJul 12 2013This paper deals with two kinds of the one-dimensional global optimization problems over a closed finite interval: (i) the objective function $f(x)$ satisfies the Lipschitz condition with a constant $L$; (ii) the first derivative of $f(x)$ satisfies the ... More
Free boundary regularity for a problem with right hand sideDec 10 2009We consider a one-phase free boundary problem with variable coefficients and non-zero right hand side. We prove that flat free boundaries are $C^{1,\alpha}$ using a different approach than the classical supconvolution method of Caffarelli. We use this ... More
Existence and regularity of monotone solutions to a free boundary problemJan 15 2007We investigate existence and regularity properties of one-phase free boundary graphs, in connection with the question of whether there exists a complete non-planar free boundary graph in high dimensions.
Deterministic global optimization using space-filling curves and multiple estimates of Lipschitz and Holder constantsSep 11 2015In this paper, the global optimization problem $\min_{y\in S} F(y)$ with $S$ being a hyperinterval in $\Re^N$ and $F(y)$ satisfying the Lipschitz condition with an unknown Lipschitz constant is considered. It is supposed that the function $F(y)$ can be ... More
Fragmented MonitoringAug 24 2017Field data is an invaluable source of information for testers and developers because it witnesses how software systems operate in real environments, capturing scenarios and configurations relevant to end-users. Unfortunately, collecting traces might be ... More
The evolution of galaxy sizesDec 13 2012We present a study of galaxy sizes in the local Universe as a function of galaxy environment, comparing clusters and the general field. Galaxies with radii and masses comparable to high-z massive and compact galaxies represent 4.4% of all galaxies more ... More
On the monodromy action on Milnor fibers of graphic arrangementsSep 03 2006Oct 29 2007We analyze the monodromy action, over the rationals, on the first homology group of the Milnor fiber, for arbitrary subarrangements of Coxeter arrangements. We propose a combinatorial formula for the monodromy action, involving Aomoto complexes in positive ... More
C^{2,α}$ regularity of flat free boundaries for the thin one-phase problemNov 10 2011We prove $C^{2,\alpha}$ regularity of sufficiently flat free boundaries, for the thin one-phase problem in which the free boundary occurs on a lower dimensional subspace. This problem appears also as a model of a one-phase free boundary problem in the ... More
A gradient bound for free boundary graphsSep 23 2010We prove an analogue for a one-phase free boundary problem of the classical gradient bound for solutions to the minimal surface equation. It follows, in particular, that every energy-minimizing free boundary that is a graph is also smooth. The method ... More
Regularity of Lipschitz free boundaries for the thin one-phase problemMay 08 2012We study regularity properties of the free boundary for the thin one-phase problem which consists of minimizing the energy functional $$\label{E} E(u,\Omega) = \int_\Omega |\nabla u|^2 dX + \mathcal{H}^n(\{u>0\} \cap \{x_{n+1} = 0\}), \quad \Omega \subset ... More
$C^{\infty}$ regularity of certain thin free boundariesFeb 05 2014We continue our study of the free boundary regularity in the thin one-phase problem and show that $C^{2,\alpha}$ free boundaries are smooth.
Boundary Harnack estimates in slit domains and applications to thin free boundary problemsJun 23 2014We provide a higher order boundary Harnack inequality for harmonic functions in slit domains. As a corollary we obtain the $C^\infty$ regularity of the free boundary in the Signorini problem near non-degenerate points.
Local and global survival for nonhomogeneous random walk systems on ZJan 16 2012Dec 19 2012We study an interacting random walk system on Z where at time 0 there is an active particle at 0 and one inactive particle on each site $n \ge 1$. Particles become active when hit by another active particle. Once activated, the particle starting at n ... More
The algebra of bounded type holomorphic functions on the ballNov 09 2018We study the spectrum $M_b(U)$ of the algebra of bounded type holomorphic functions on a complete Reinhardt domain in a symmetrically regular Banach space $E$ as an analytic manifold over the bidual of the space. In the case that $U$ is the unit ball ... More
Model Checking Classes of Metric LTL Properties of Object-Oriented Real-Time Maude SpecificationsSep 22 2010This paper presents a transformational approach for model checking two important classes of metric temporal logic (MTL) properties, namely, bounded response and minimum separation, for nonhierarchical object-oriented Real-Time Maude specifications. We ... More
The Approximate Optimality of Simple Schedules for Half-Duplex Multi-Relay NetworksOct 27 2014In ISIT'12 Brahma, \"{O}zg\"{u}r and Fragouli conjectured that in a half-duplex diamond relay network (a Gaussian noise network without a direct source-destination link and with $N$ non-interfering relays) an approximately optimal relay scheduling (achieving ... More
On the homotopy type of the space of Sullivan diagramsMay 21 2017We study the homotopy type of the harmonic compactification of the moduli space of a 2-cobordism S with one outgoing boundary component, or equivalently of the space of Sullivan diagrams of type S on one circle. Our results are of two types: vanishing ... More
Wavelet transform on the torus: a group theoretical approachOct 31 2013We construct a Continuous Wavelet Transform (CWT) on the torus $\mathbb T^2$ following a group-theoretical approach based on the conformal group $SO(2,2)$. The Euclidean limit reproduces wavelets on the plane $\mathbb R^2$ with two dilations, which can ... More
Dark energy and Dark matter interaction in light of the second law of thermodynamicsDec 09 2018In the context of thermodynamics we discuss the way inevitable emerge an interaction between dark components, and in this way, provide a mechanism to understand the limits of the LCDM model and the class of interaction models between dark components. ... More
ACQUIRE: an inexact iteratively reweighted norm approach for TV-based Poisson image restorationJul 27 2018Feb 17 2019We propose a method, called ACQUIRE, for the solution of constrained optimization problems modeling the restoration of images corrupted by Poisson noise. The objective function is the sum of a generalized Kullback-Leibler divergence term and a TV regularizer, ... More
The Two-user Causal Cognitive Interference Channel: Novel Outer Bounds and Constant Gap Result for the Symmetric Gaussian Noise Channel in Weak InterferenceMar 25 2015This paper studies the two-user Causal Cognitive Interference Channel (CCIC), where two transmitters aim to communicate independent messages to two different receivers via a common channel. One source, referred to as the cognitive, is capable of overhearing ... More
On the Capacity Region of the Layered Packet Erasure Broadcast Channel with FeedbackJan 07 2019In this paper, the capacity region of the Layered Packet Erasure Broadcast Channel (LPE-BC) with Channel Output Feedback (COF) available at the transmitter is investigated. The LPE-BC is a high-SNR approximation of the fading Gaussian BC recently proposed ... More
Zero forcing in iterated line digraphsAug 10 2017Oct 23 2018Zero forcing is a propagation process on a graph, or digraph, defined in linear algebra to provide a bound for the minimum rank problem. Independently, zero forcing was introduced in physics, computer science and network science, areas where line digraphs ... More
Are Clusterings of Multiple Data Views Independent?Jan 12 2019In the Pioneer 100 (P100) Wellness Project (Price and others, 2017), multiple types of data are collected on a single set of healthy participants at multiple timepoints in order to characterize and optimize wellness. One way to do this is to identify ... More
A note on complete subdivisions in digraphs of large outdegreeMay 07 2006Mader conjectured that for all k there is an integer d(k) such that every digraph of minimum outdegree at least d(k) contains a subdivision of a transitive tournament of order k. In this note we observe that if the minimum outdegree of a digraph is sufficiently ... More
A Dirac type result on Hamilton cycles in oriented graphsSep 07 2007Jun 04 2008We show that for each \alpha>0 every sufficiently large oriented graph G with \delta^+(G),\delta^-(G)\ge 3|G|/8+ \alpha |G| contains a Hamilton cycle. This gives an approximate solution to a problem of Thomassen. In fact, we prove the stronger result ... More
An Ore-type theorem for perfect packings in graphsJul 30 2008Jun 02 2009We say that a graph G has a perfect H-packing (also called an H-factor) if there exists a set of disjoint copies of H in G which together cover all the vertices of G. Given a graph H, we determine, asymptotically, the Ore-type degree condition which ensures ... More
Healing Data Loss Problems in Android AppsJan 19 2017Android apps should be designed to cope with stop-start events, which are the events that require stopping and restoring the execution of an app while leaving its state unaltered. These events can be caused by run-time configuration changes, such as a ... More
Towards a gauge-polyvalent Numerical Relativity codeNov 11 2008Feb 10 2009The gauge polyvalence of a new numerical code is tested, both in harmonic-coordinate simulations (gauge-waves testbed) and in singularity-avoiding coordinates (simple Black-Hole simulations, either with or without shift). The code is built upon an adjusted ... More
On Network Simplification for Gaussian Half-Duplex Diamond NetworksJan 20 2016Jul 04 2016This paper investigates the simplification problem in Gaussian Half-Duplex (HD) diamond networks. The goal is to answer the following question: what is the minimum (worst-case) fraction of the total HD capacity that one can always achieve by smartly selecting ... More
Low regularity solutions for a 2D quadratic non-linear Schrödinger equationSep 08 2006We establish that the initial value problem for the quadratic non-linear Schr\"odinger equation $$ iu_t - \Delta u = u^2$$ where $u: \R^2 \times \R \to \C$, is locally well-posed in $H^s(\R^2)$ when $s > -1$. The critical exponent for this problem is ... More
A fully nonlinear problem with free boundary in the planeNov 10 2008We prove that bounded solutions to an overdetermined fully nonlinear free boundary problem in the plane are one dimensional. Our proof relies on maximum principle techniques and convexity arguments.
Minimizers of Convex Functionals Arising in Random SurfacesSep 22 2008We investigate regularity of minimizers in two dimensions for certain classes of non-smooth convex functionals. In particular our results apply to the surface tensions that appear in recent works on random surfaces and random tilings of Kenyon, Okounkov ... More
A note on higher regularity boundary Harnack inequalityMar 11 2014We show that the quotient of two positive harmonic functions vanishing on the boundary of a $C^{k,\alpha}$ domain is of class $C^{k,\alpha}$ up to the boundary.
Isofrequency pairing of spinning particles in Schwarzschild-de Sitter spacetimeMay 21 2015It has been established in Schwarzschild spacetime (and more generally in Kerr spacetime) that pairs of geometrically different timelike geodesics with the same radial and azimuthal frequencies exist in the strong field regime. The occurrence of this ... More
Structures and waves in a nonlinear heat-conducting mediumJan 18 2013The paper is an overview of the main contributions of a Bulgarian team of researchers to the problem of finding the possible structures and waves in the open nonlinear heat conducting medium, described by a reaction-diffusion equation. Being posed and ... More
An algorithm to estimate the vertices of a tetrahedron from uniform random points insideAug 30 2016Aug 18 2017In this paper, we give an algorithm to infer the positions of the vertices of an unknown tetrahedron, given a sample of points which are uniformly distributed within the tetrahedron. The accuracy of the algorithm is demonstrated using some numerical experiments. ... More
ReviewerNet: Visualizing Citation and Authorship Relations for Finding ReviewersMar 19 2019We propose ReviewerNet, an online, interactive visualization system aimed to improve the reviewer selection process in the academic domain. Given a paper submitted for publication, we assume that good candidate reviewers can be chosen among the authors ... More
Hydration Water Dynamics and Instigation of Protein Structural RelaxationOct 11 2003The molecular mechanism of the solvent motion that is required to instigate the protein structural relaxation above a critical hydration level or transition temperature has yet to be determined. In this work we use quasi-elastic neutron scattering (QENS) ... More
Robust estimators in a generalized partly linear regression model under monotony constraintsFeb 22 2018Nov 29 2018In this paper, we consider the situation in which the observations follow an isotonic generalized partly linear model. Under this model, the mean of the responses is modelled, through a link function, linearly on some covariates and nonparametrically ... More
Edge-disjoint Hamilton cycles in random graphsApr 22 2011May 08 2013We show that provided $\log^{50} n/n \leq p \leq 1 - n^{-1/4}\log^9 n$ we can with high probability find a collection of $\lfloor \delta(G)/2 \rfloor$ edge-disjoint Hamilton cycles in $G \sim G_{n, p}$, plus an additional edge-disjoint matching of size ... More
Chebyshev-Grüss-type inequalities via discrete oscillationsJan 30 2014The classical form of Gr\"uss' inequality, first published by G. Gr\"{u}ss in 1935, gives an estimate of the difference between the integral of the product and the product of the integrals of two functions. In the subsequent years, many variants of this ... More
Dynamic Interconnection and Damping Injection for Input-to-State Stable Bilateral TeleoperationFeb 14 2019In bilateral teleoperation, the human who operates the master and the environment which interacts with the slave are part of the force feedback loop. Yet, both have time-varying and unpredictable dynamics and are challenging to model. A conventional strategy ... More
Wafer-scale fabrication and room-temperature experiments on graphene-based gates for quantum computationMar 04 2018We have fabricated at wafer scale graphene-based configurations suitable for implementing at room temperature one-qubit quantum gates and a modified Deutsch-Jozsa algorithm. Our measurements confirmed the (quasi-)ballistic nature of charge carrier propagation ... More
On Code Design for Wireless Channels with Additive Radar InterferenceApr 11 2019This paper considers the problem of code design for a channel where communications and radar systems coexist, modeled as having both Additive White Gaussian Noise (AWGN) and Additive Radar Interference (ARI). The issue of how to adapt or re-design convolutional ... More
Vectorized and Parallel Particle Filter SMC Parameter Estimation for Stiff ODEsNov 06 2014Particle filter (PF) sequential Monte Carlo (SMC) methods are very attractive for the estimation of parameters of time dependent systems where the data is either not all available at once, or the range of time constants is wide enough to create problems ... More
The Cluster Graphical Lasso for improved estimation of Gaussian graphical modelsJul 19 2013We consider the task of estimating a Gaussian graphical model in the high-dimensional setting. The graphical lasso, which involves maximizing the Gaussian log likelihood subject to an l1 penalty, is a well-studied approach for this task. We begin by introducing ... More
Galton-Watson processes in varying environment and accessibility percolationNov 10 2016Sep 28 2017This paper deals with branching processes in varying environment, namely, whose offspring distributions depend on the generations. We provide sufficient conditions for survival or extinction which rely only on the first and second moments of the offspring ... More
Bipartitions of highly connected tournamentsNov 06 2014Feb 01 2015We show that if $T$ is a strongly $10^9k^6\log(2k)$-connected tournament, there exists a partition $A, B$ of $V(T)$ such that each of $T[A]$, $T[B]$ and $T[A,B]$ is strongly $k$-connected. This provides tournament analogues of two partition conjectures ... More
Algebraic and Topological Results on Lifting Properties in Residuated LatticesMar 19 2014We define lifting properties for universal algebras, which we study in this general context and then particularize to various such properties in certain classes of algebras. Next we focus on residuated lattices, in which we investigate lifting properties ... More
A Schwarz lemma for locally univalent meromorphic functionsFeb 19 2019We prove a sharp Schwarz-type lemma for meromorphic functions with spherical derivative uniformly bounded away from zero. As a consequence we deduce an improved quantitative version of a recent normality criterion due to Grahl & Nevo and Steinmetz, which ... More
Policy Enforcement with Proactive LibrariesMar 23 2017May 26 2017Software libraries implement APIs that deliver reusable functionalities. To correctly use these functionalities, software applications must satisfy certain correctness policies, for instance policies about the order some API methods can be invoked and ... More
Linear bounds for the normal covering number of the symmetric and alternating groupsMar 12 2019The normal covering number $\gamma(G)$ of a finite, non-cyclic group $G$ is the minimum number of proper subgroups such that each element of $G$ lies in some conjugate of one of these subgroups. We find lower bounds linear in $n$ for $\gamma(S_n)$, when ... More
A new dissipation term for finite-difference simulations in RelativityNov 29 2007We present a new numerical dissipation algorithm, which can be efficiently used in combination with centered finite-difference methods. We start from a formulation of centered finite-volume methods for Numerical Relativity, in which third-order space ... More
On the Optimality of Simple Schedules for Networks with Multiple Half-Duplex RelaysDec 05 2014This paper studies networks with N half-duplex relays assisting the communication between a source and a destination. In ISIT'12 Brahma, \"{O}zg\"{u}r and Fragouli conjectured that in Gaussian half-duplex diamond networks (i.e., without a direct link ... More
Highly under-expanded jets in the presence of a transverse density gradientMay 28 2010An experimental research concerning highly underexpanded jets made of different gases from the surrounding ambient is here described. By selecting different species of gases, it was possible to vary the jet-to-ambient density ratio in the 0.04 to 12 range ... More
Two-phase anisotropic free boundary problems and applications to the Bellman equation in 2DApr 15 2016We prove Lipschitz continuity of solutions to a class of rather general two-phase anisotropic free boundary problems in 2D and we classify global solutions. As a consequence, we obtain $C^{2,1}$ regularity of solutions to the Bellman equation in 2D.
Kolmogorov scaling bridges linear hydrodynamic stability and turbulenceOct 19 2011The way in which kinetic energy is distributed over the multiplicity of inertial (intermediate) scales is a fundamental feature of turbulence. According to Kolmogorov's 1941 theory, on the basis of a dimensional analysis, the form of the energy spectrum ... More
A one-phase problem for the fractional Laplacian: regularity of flat free boundariesJan 24 2014We consider a one-phase free boundary problem involving a fractional Laplacian $(-\Delta)^\alpha$, $0<\alpha <1,$ and we prove that ``flat free boundaries" are $C^{1,\gamma}$. We thus extend the known result for the case $\alpha=1/2.$
The Nature of Infrared Emission in the Local Group Dwarf Galaxy NGC 6822 As Revealed by SpitzerAug 11 2006We present Spitzer imaging of the metal-deficient (Z ~30% Z_sun) Local Group dwarf galaxy NGC 6822. On spatial scales of ~130 pc, we study the nature of IR, H alpha, HI, and radio continuum emission. Nebular emission strength correlates with IR surface ... More
Determination of density and concentration from fluorescent images of a gas flowJun 27 2007Jul 03 2007A fluorescent image analysis procedure to determine the distribution of species concentration and density in a gas flow is proposed. The fluorescent emission is due to the excitation of atoms/molecules of a gas that is intercepted by an electron blade. ... More