Results for "Jose M. Such"

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The Security of Smart Buildings: a Systematic Literature ReviewJan 17 2019Jan 28 2019Smart Buildings are networks of connected devices and software in charge of automatically managing and controlling several building functions such as HVAC, fire alarms, lighting, shading and more. These systems evolved from mostly electronic and mechanical ... More
Smart Home Personal Assistants: A Security and Privacy ReviewMar 13 2019Smart Home Personal Assistants (SPA) are an emerging innovation that is changing the way in which home users interact with the technology. However, there are a number of elements that expose these systems to various risks: i) the open nature of the voice ... More
Smart Home Personal Assistants: A Security and Privacy ReviewMar 13 2019Mar 17 2019Smart Home Personal Assistants (SPA) are an emerging innovation that is changing the way in which home users interact with the technology. However, there are a number of elements that expose these systems to various risks: i) the open nature of the voice ... More
Norm Monitoring under Partial Action ObservabilityMay 15 2015Apr 21 2016In the context of using norms for controlling multi-agent systems, a vitally important question that has not yet been addressed in the literature is the development of mechanisms for monitoring norm compliance under partial action observability. This ... More
Implicit Contextual Integrity in Online Social NetworksFeb 09 2015Jul 06 2015Many real incidents demonstrate that users of Online Social Networks need mechanisms that help them manage their interactions by increasing the awareness of the different contexts that coexist in Online Social Networks and preventing them from exchanging ... More
Resolving Multi-party Privacy Conflicts in Social MediaJul 16 2015Feb 22 2016Items shared through Social Media may affect more than one user's privacy --- e.g., photos that depict multiple users, comments that mention multiple users, events in which multiple users are invited, etc. The lack of multi-party privacy management support ... More
Phoneme discrimination using neurons with symmetric nonlinear response over a spectral rangeNov 04 2013We consider the ability of a very simple feed-forward neural network to discriminate phonemes based on just relative power spectrum. The network consists of two neurons with symmetric nonlinear response over a spectral range. The output of the neurons ... More
Entropy of leukemia on multidimensional morphological and molecular landscapesMay 30 2014Leukemia epitomizes the class of highly complex diseases that new technologies aim to tackle by using large sets of single-cell level information. Achieving such goal depends critically not only on experimental techniques but also on approaches to interpret ... More
The space of Constant Mean Curvature surfaces in compact Riemannian ManifoldsMay 16 2011Aug 29 2011The main point of this paper is that, under suitable conditions on the mean curvature and the Ricci curvature of the ambient space, we can extend Choi-Schoen's Compactness Theorem to compact embedded minimal surfaces to simple immersed compact H-surfaces ... More
The Universe at extreme magnificationJun 12 2018Extreme magnifications of distant objects by factors of several thousand have recently become a reality. Small very luminous compact objects, such as supernovae (SNe), giant stars at z=1-2, Pop III stars at z>7 and even gravitational waves from merging ... More
Rigidity of stable cylinders in three-manifoldsApr 16 2011In this paper we show how the existence of a certain stable cylinder determines (locally) the ambient manifold where it is immersed. This cylinder has to verify a {\it bifurcation phenomena}, we make this explicit in the introduction. In particular, the ... More
Faithfulness in Chain Graphs: The Gaussian CaseAug 13 2010This paper deals with chain graphs under the classic Lauritzen-Wermuth-Frydenberg interpretation. We prove that the regular Gaussian distributions that factorize with respect to a chain graph $G$ with $d$ parameters have positive Lebesgue measure with ... More
Some geometric aspects of Puiseux surfacesMar 21 2007The following problem is treated: Characterizing the tangent cone and the equimultiple locus of a Puiseux surface (that is, an algebroid embedded surface admitting an equation whose roots are Puiseux power series), using a set of exponents appearing in ... More
A Rational Indicator of Scientific CreativityAug 01 2006A model is proposed for the creation and transmission of scientific knowledge, based on the network of citations among research articles. The model allows to assign to each article a nonnegative value for its creativity, i. e. its creation of new knowledge. ... More
Learning AMP Chain Graphs and some Marginal Models Thereof under Faithfulness: Extended VersionMar 04 2013Jan 17 2014This paper deals with chain graphs under the Andersson-Madigan-Perlman (AMP) interpretation. In particular, we present a constraint based algorithm for learning an AMP chain graph a given probability distribution is faithful to. Moreover, we show that ... More
Reading Dependencies from Polytree-Like Bayesian NetworksJun 20 2012We present a graphical criterion for reading dependencies from the minimal directed independence map G of a graphoid p when G is a polytree and p satisfies composition and weak transitivity. We prove that the criterion is sound and complete. We argue ... More
Hilbert C*-modules are JB*-triplesDec 20 2001We show that every Hilbert C*-module E is a JB*-triple in a canonical way and establish an explicit expression for the holomorphic automorphisms of the unit ball of E.
A note on dyadic coverings and nondoubling Calderón-Zygmund theoryJan 17 2012Mar 15 2012We construct a family of n+1 dyadic filtrations in R^n, so that every Euclidean ball B is contained in some cube Q of our family satisfying diam(Q) \le c_n diam(B) for some dimensional constant c_n. Our dyadic covering is optimal on the number of filtrations ... More
Winning the Big Data Technologies Horizon Prize: Fast and reliable forecasting of electricity grid traffic by identification of recurrent fluctuationsFeb 12 2019This paper provides a description of the approach and methodology I used in winning the European Union Big Data Technologies Horizon Prize on data-driven prediction of electricity grid traffic. The methodology relies on identifying typical short-term ... More
xPerm: fast index canonicalization for tensor computer algebraMar 06 2008We present a very fast implementation of the Butler-Portugal algorithm for index canonicalization with respect to permutation symmetries. It is called xPerm, and has been written as a combination of a Mathematica package and a C subroutine. The latter ... More
Structures and Stabilities of CaO and MgO Clusters and Cluster Ions: An alternative interpretation of the experimental mass spectraApr 19 2000Sep 12 2000The structures and relative stabilities of doubly-charged nonstoichiometric (CaO)$_n$Ca$^{2+}$ (n=1--29) cluster ions and of neutral stoichiometric (MgO)$_n$ and (CaO)$_n$ (n=3,6,9,12,15,18) clusters are studied through {\em ab initio} Perturbed Ion plus ... More
Volume Images Vector Display Based on a Diffractive ScreenJan 17 2011A white light system based on a 65 cm x 35 cm diffractive screen is demonstrated to be capable of displaying three-dimensional figures with continuous horizontal parallax. Three computer-controlled mirrors and a diffractive-refractive optical system are ... More
When strictly locally convex hypersurfaces are embeddedFeb 27 2010In this paper we will prove Hadamard-Stoker type theorems in the following ambient spaces: $\man ^n \times \r$, where $\man ^n $ is a $1/4-$pinched manifold, and certain Killing submersions, e.g., Berger spheres and Heisenberg spaces. That is, under the ... More
Complete Constant Mean Curvature surfaces and Bernstein type Theorems in $\mathbb{M}^2\times \mathbb{R}$Aug 25 2008In this paper we study constant mean curvature surfaces $\Sigma$ in a product space, $\mathbb{M}^2\times \mathbb{R}$, where $\mathbb{M}^2$ is a complete Riemannian manifold. We assume the angle function $\nu = \meta{N}{\partial_t}$ does not change sign ... More
A Colding-Minicozzi Stability inequality and its applicationsAug 21 2008Nov 13 2009We consider operators $L$ acting on functions on a Riemannian surface, $\Sigma$, of the form $L = \Delta + V +a K.$ Here $\Delta$ is the Laplacian of $\Sigma$, $V$ a non-negative potential on $\Sigma$, K the Gaussian curvature and $a$ is a non-negative ... More
NMR lineshape in Metallic Nanoparticles: a Matrix Continued Fraction evaluationApr 04 1997May 02 1997In metallic nanoparticles, the different electronic environment seen by each magnetic nucleus produces a distribution of Knight shifts of the NMR frequencies which is observed as an inhomogeneously broadened lineshape. We study the fluctuations in the ... More
Totally umbilical disks and applications to surfaces in three-dimensional homogeneous spacesJul 31 2009Sep 23 2009Following ideas of Choe and Fernandez-do Carmo, we give sufficient conditions for a disk type surface, with piecewise smooth boundary, to be totally umbilical for a given Coddazi pair. As a consequence, we obtain rigidity results for surfaces in space ... More
Boundary-layer turbulence in experiments of quasi-Keplerian flowsAug 19 2016Feb 23 2017Most flows in nature and engineering are turbulent because of their large velocities and spatial scales. Laboratory experiments of rotating quasi-Keplerian flows, for which the angular velocity decreases radially but the angular momentum increases, are ... More
Equimultiple locus of embedded algebroid surfaces and blowing--up in characteristic zeroMar 20 2007The smooth equimultiple locus of embedded algebroid surfaces appears naturally in many resolution process, both classical and modern. In this paper we explore how it changes by blowing--up.
Regularizing effect of homogeneous evolution equations: case homogeneous order zeroJan 24 2019In this paper, we develop a functional analytical theory for establishing that mild solutions of first-order Cauchy problems involving homogeneous operators of order zero are strong solutions; in particular, the first-order time derivative satisfies a ... More
Optimal Fourier filtering of a function that is strictly confined within a sphereJul 31 2008We present an alternative method to filter a distribution, that is strictly confined within a sphere of given radius $r_c$, so that its Fourier transform is optimally confined within another sphere of radius $k_c$. In electronic structure methods, it ... More
Equimultiple locus of embedded algebroid surfaces and blowing--up in arbitrary characteristicMar 20 2007This paper extends previous results of the authors, concerning the behaviour of the equimultiple locus of algebroid surfaces under blowing--up, to arbitrary characteristic.
Appearance of effective surface conductivity - an experimental and analytic studyMay 19 2015Aug 10 2015Surface conductance measurements on p-type doped germanium show a small but systematic change to the surface conductivity at different length scales. This effect is independent of the structure of the surface states. We interpret this phenomenon as a ... More
Efficient transfer learning and online adaptation with latent variable models for continuous controlDec 08 2018Traditional model-based RL relies on hand-specified or learned models of transition dynamics of the environment. These methods are sample efficient and facilitate learning in the real world but fail to generalize to subtle variations in the underlying ... More
Complete surfaces of constant curvature in H2xR and S2xROct 15 2005We study isometric immersions of surfaces of constant curvature into the homogeneous spaces H2xR and S2xR. In particular, we prove that there exists a unique isometric immersion from the standard 2-sphere of constant curvature c>0 into H2xR and a unique ... More
Cyclic metric Lie groupsJul 02 2014Jul 21 2014Cyclic metric Lie groups are Lie groups equipped with a left-invariant metric which is in some way far from being biinvariant, in a sense made explicit in terms of Tricerri and Vanhecke's homogeneous structures. The semisimple and solvable cases are studied. ... More
A new spherically symmetric general relativistic hydrodynamical codeSep 25 1995Sep 26 1995In this paper we present a full general relativistic one-dimensional hydro-code which incorporates a modern high-resolution shock-capturing algorithm, with an approximate Riemann solver, for the correct modelling of formation and propagation of strong ... More
On scalar and vector fields coupled to the energy-momentum tensorMar 15 2018May 13 2018We consider theories for scalar and vector fields coupled to the energy-momentum tensor. Since these fields also carry a non-trivial energy-momentum tensor, the coupling prescription generates self-interactions. In analogy with gravity theories, we built ... More
Transport coefficients and the 2PI effective action in the large N limitSep 08 2004We discuss the computation of transport coefficients in large N_f QCD and the O(N) model for massive particles. The calculation is organized using the 1/N expansion of the 2PI effective action to next-to-leading order. For the gauge theory, we verify ... More
A New Point of View in the Theory of Knot and Link InvariantsApr 18 2001Aug 07 2001Recent progress in string theory has led to a reformulation of quantum-group polynomial invariants for knots and links into new polynomial invariants whose coefficients can be understood in topological terms. We describe in detail how to construct the ... More
Transport coefficients from the lattice?Sep 03 2002The prospects of extracting transport coefficients from euclidean lattice simulations are discussed. Some general comments on the reconstruction of spectral functions using the Maximal Entropy Method are given as well.
Transport coefficients from the 2PI effective actionMar 25 2003Sep 17 2003We show that the lowest nontrivial truncation of the two-particle irreducible (2PI) effective action correctly determines transport coefficients in a weak coupling or 1/N expansion at leading (logarithmic) order in several relativistic field theories. ... More
A pointwise estimate for positive dyadic shifts and some applicationsSep 15 2014We prove a pointwise estimate for positive dyadic shifts of complexity $m$ which is linear in the complexity. This can be used to give a pointwise estimate for Calder\'on-Zygmund operators and to answer a question posed by A. Lerner. Several applications ... More
ExpandNets: Exploiting Linear Redundancy to Train Small NetworksNov 26 2018Dec 12 2018While very deep networks can achieve great performance, they are ill-suited to applications in resource-constrained environments. Knowledge transfer, which leverages a deep teacher network to train a given small network, has emerged as one of the most ... More
Low temperature behaviour and glass line of the symmetrical colloidal electrolyteJan 17 2007We report on the low temperature behaviour of the colloidal electrolyte by means of Molecular Dynamics simulations, where the electrostatic interactions were modeled using effective screened interactions. As in previous works, we have found a region of ... More
The Relevance of Bayesian Layer Positioning to Model Uncertainty in Deep Bayesian Active LearningNov 29 2018One of the main challenges of deep learning tools is their inability to capture model uncertainty. While Bayesian deep learning can be used to tackle the problem, Bayesian neural networks often require more time and computational power to train than deterministic ... More
Thue equations and torsion groups of elliptic curvesJun 20 2007A new characterization of rational torsion subgroups of elliptic curves is found, for points of order greater than 4, through the existence of solution for systems of Thue equations.
The uses of Connes and Kreimer's algebraic formulation of renormalization theoryJan 05 2003Jul 05 2004We show how, modulo the distinction between the antipode and the "twisted" or "renormalized" antipode, Connes and Kreimer's algebraic paradigm trivializes the proofs of equivalence of the (corrected) Dyson-Salam, Bogoliubov-Parasiuk-Hepp and Zimmermann ... More
On the antipode of Kreimer's Hopf algebraDec 19 1999Mar 08 2000We give a new formula for the antipode of the algebra of rooted trees, directly in terms of the bialgebra structure. The equivalence, proved in this paper, among the three available formulae for the antipode, reflects the equivalence among the Bogoliubov-Parasiuk-Hepp, ... More
Combinatorial Hopf algebras in quantum field theory IAug 19 2004Jun 06 2005This manuscript stands at the interface between combinatorial Hopf algebra theory and renormalization theory. Its plan is as follows: Section 1 is the introduction, and contains as well an elementary invitation to the subject. The rest of part I, comprising ... More
Halfspace type Theorems for Self-ShrinkersDec 11 2014In this short paper we extend the classical Hoffman-Meeks Halfspace Theorem to self-shrinkers, that is: "Let $P $ be a hyperplane passing through the origin. The only properly immersed self-shrinker $\Sigma$ contained in one of the closed half-space determined ... More
Longitudinal optical fields in light scattering from dielectric spheres and Anderson localization of lightJul 23 2018Recent research has shown that coupling between point scatterers in a disordered medium by longitudinal electromagnetic fields is harmful for Anderson localization of light. However, it has been unclear if this feature is generic or specific for point ... More
Boundary conditions effects by Discontinuous Galerkin solvers for Boltzmann-Poisson models of electron transportNov 20 2014In this paper we perform, by means of Discontinuous Galerkin (DG) Finite Element Method (FEM) based numerical solvers for Boltzmann-Poisson (BP) semiclassical models of hot electronic transport in semiconductors, a numerical study of reflective boundary ... More
Two-point Taylor Expansions of Analytic FunctionsMay 07 2002Taylor expansions of analytic functions are considered with respect to two points. Cauchy-type formulas are given for coefficients and remainders in the expansions, and the regions of convergence are indicated. It is explained how these expansions can ... More
Universal deformation rings of modules over Frobenius algebrasNov 05 2009Feb 08 2011Let $k$ be a field, and let $\Lambda$ be a finite dimensional $k$-algebra. We prove that if $\Lambda$ is a self-injective algebra, then every finitely generated $\Lambda$-module $V$ whose stable endomorphism ring is isomorphic to $k$ has a universal deformation ... More
Bounds on Gromov Hyperbolicity ConstantMar 04 2015If $X$ is a geodesic metric space and $x_{1},x_{2},x_{3} \in X$, a geodesic triangle $T=\{x_{1},x_{2},x_{3}\}$ is the union of the three geodesics $[x_{1}x_{2}]$, $[x_{2}x_{3}]$ and $[x_{3}x_{1}]$ in $X$. The space $X$ is $\delta$-hyperbolic in the Gromov ... More
Variational finite-difference representation of the kinetic energy operatorAug 13 2001A potential disadvantage of real-space-grid electronic structure methods is the lack of a variational principle and the concomitant increase of total energy with grid refinement. We show that the origin of this feature is the systematic underestimation ... More
The exponentially truncated q-distribution: A generalized distribution for real complex systemsJul 03 2008To know the statistical distribution of a variable is an important problem in management of resources. Distributions of the power law type are observed in many real systems. However power law distributions have an infinite variance and thus can not be ... More
On the base $b$ expansion of the number of trailing zeroes of $b^k!$Feb 22 2010Let us denote by $Z_{b}(n)$ the number of trailing zeroes in the base b expansion of $n!$. In this paper we study the connection between the expression of $\vartheta(b):=\lim_{n\to \infty}Z_{b}(n)/n$ in base $b$, and that of $Z_{b}(b^{k})$. In particular, ... More
A real variable characterization of Gromov hyperbolicity of flute surfacesMay 31 2008In this paper we give a characterization of the Gromov hyperbolicity of trains (a large class of Denjoy domains which contains the flute surfaces) in terms of the behavior of a real function. This function describes somehow the distances between some ... More
Structure Theorem for Riemannian surfaces with arbitrary curvatureMay 31 2008In this paper we prove that any Riemannian surface, with no restriction of curvature at all, can be decomposed into blocks belonging just to some of these types: generalized Y-pieces, generalized funnels and halfplanes.
Fast Scramblers, Horizons and Expander GraphsApr 28 2012Jun 10 2012We propose that local quantum systems defined on expander graphs provide a simple microscopic model for thermalization on quantum horizons. Such systems are automatically fast scramblers and are motivated from the membrane paradigm by a conformal transformation ... More
Deformations of complexes for finite dimensional algebrasNov 25 2015Aug 03 2017Let $k$ be a field and let $\Lambda$ be a finite dimensional $k$-algebra. We prove that every bounded complex $V^\bullet$ of finitely generated $\Lambda$-modules has a well-defined versal deformation ring $R(\Lambda,V^\bullet)$ which is a complete local ... More
Fermi level pinning at the Ge(001) surface - A case for non-standard explanationJul 09 2015Nov 12 2015To explore the origin of the Fermi level pinning in germanium we investigate the Ge(001) and Ge(001):H surfaces. The absence of relevant surface states in the case of Ge(001):H should unpin the surface Fermi level. This is not observed. For samples with ... More
Deep Neuroevolution: Genetic Algorithms Are a Competitive Alternative for Training Deep Neural Networks for Reinforcement LearningDec 18 2017Apr 20 2018Deep artificial neural networks (DNNs) are typically trained via gradient-based learning algorithms, namely backpropagation. Evolution strategies (ES) can rival backprop-based algorithms such as Q-learning and policy gradients on challenging deep reinforcement ... More
An Intriguing Failing of Convolutional Neural Networks and the CoordConv SolutionJul 09 2018Dec 03 2018Few ideas have enjoyed as large an impact on deep learning as convolution. For any problem involving pixels or spatial representations, common intuition holds that convolutional neural networks may be appropriate. In this paper we show a striking counterexample ... More
Preservation of information in a prebiotic package modelDec 26 2006Apr 19 2007The coexistence between different informational molecules has been the preferred mode to circumvent the limitation posed by imperfect replication on the amount of information stored by each of these molecules. Here we reexamine a classic package model ... More
A new look at the Feynman `hodograph' approach to the Kepler first lawMay 04 2016Hodographs for the Kepler problem are circles. This fact, known since almost two centuries ago, still provides the simplest path to derive the Kepler first law. Through Feynman `lost lecture', this derivation has now reached to a wider audience. Here ... More
Corners for Layout: End-to-End Layout Recovery from 360 ImagesMar 19 2019The problem of 3D layout recovery in indoor scenes has been a core research topic for over a decade. However, there are still several major challenges that remain unsolved. Among the most relevant ones, a major part of the state-of-the-art methods make ... More
``N=4: A Unifying Framework for 2d Topological Gravity, $c_M\leq 1$ String Theory and Constrained Topological Sigma Model''Feb 14 1995Feb 15 1995It is shown that two dimensional (2d) topological gravity in the conformal gauge has a larger symmetry than has been hitherto recognized; in the formulation of Labastida, Pernici and Witten it contains a twisted ``small'' N=4 superconformal symmetry. ... More
Parabolic stable surfaces with constant mean curvatureOct 28 2009Apr 22 2010We prove that if u is a bounded smooth function in the kernel of a nonnegative Schrodinger operator $-L=-(\Delta +q)$ on a parabolic Riemannian manifold M, then u is either identically zero or it has no zeros on M, and the linear space of such functions ... More
Filling and wetting transitions on sinusoidal substrates: a mean-field study of the Landau-Ginzburg modelAug 05 2014We study the interfacial phenomenology of a fluid in contact with a microstructured substrate within the mean-field approximation. The sculpted substrate is a one-dimensional array of infinitely long grooves of sinusoidal section of periodicity length ... More
Lunar impact flashes from Geminids, analysis of luminous efficiencies and the flux of large meteoroids on EarthNov 23 2015We analyze lunar impact flashes recorded by our team during runs in December 2007, 2011, 2013 and 2014. In total, 12 impact flashes with magnitudes ranging between 7.1 and 9.3 in V band were identified. From these, 9 events could be linked to the Geminid ... More
Planar and cagelike structures of gold clusters: Density-functional pseudopotential calculationsJun 07 2006We study why gold forms planar and cage-like clusters while copper and silver do not. We use density functional theory and norm-conserving pseudo-potentials with and without a scalar relativistic component. For the exchange-correlation functional we use ... More
Asymptotic estimates of the norms of positive definite Toeplitz matrices and detection of quasi-periodic components of stationary random signalsJun 06 2005Asymptotic forms of the Hilbert-Scmidt and Hilbert norms of positive definite Toeplitz matrices $Q_{N}=(b(j-k))_{j,k=0}^{N-1}$ as $N\to \infty $ are determined. Here $b(j)$ are consequent trigonometric moments of a generating non-negative mesure $d\sigma ... More
Quantisation without Gauge Fixing: Avoiding Gribov Ambiguities through the Physical ProjectorSep 07 1999The quantisation of gauge invariant systems usually proceeds through some gauge fixing procedure of one type or another. Typically for most cases, such gauge fixings are plagued by Gribov ambiguities, while it is only for an admissible gauge fixing that ... More
New variants of the Bell-Kochen-Specker theoremJun 03 1997We discuss two new demonstrations of the Bell-Kochen-Specker theorem: a state-independent proof using 14 four-dimensional propositions, based on a suggestion made by Clifton, and a state-specific proof involving 5 propositions on the singlet state of ... More
Stochastic dynamics and the predictability of big hits in online videosSep 21 2016Mar 10 2017The competition for the attention of users is a central element of the Internet. Crucial issues are the origin and predictability of big hits, the few items that capture a big portion of the total attention. We address these issues analyzing 10 million ... More
Origami Inspired Reconfigurable Antenna for Wireless Communication SystemsMay 25 2018This paper presents the design, fabrication, and experimental validation of an origami-inspired reconfigurable antenna. The proposed antenna can operate as a monopole or an inverted-L antenna, by changing its configuration. Doing so changes its operational ... More
Two-Dimensional Quantum ring in a Graphene Layer in the presence of a Aharonov-Bohm fluxMar 31 2016Jul 19 2016In this paper we study the relativistic quantum dynamics of a massless fermion confined in a quantum ring. We use a model of confining potential and introduce the interaction via Dirac oscillator coupling, which provides ring confinement for massless ... More
Twin LIGO/Virgo Detections of a Viable Gravitationally-Lensed Black Hole MergerJan 10 2019We identify a binary black hole (BBH) merger that appears to be multiply lensed by an intervening galaxy. The LIGO/Virgo events GW170809 and GW170814 have indistinguishable waveforms separated by 5 days, and overlap on the sky within the 90\% credible ... More
Phase-field simulation of core-annular pipe flowFeb 19 2019Phase-field methods have long been used to model the flow of immiscible fluids. Their ability to naturally capture interface topological changes is widely recognized, but their accuracy in simulating flows of real fluids in practical geometries is not ... More
Modeling stochastic gene expression under repressionDec 07 2005Intrinsic transcriptional noise induced by operator fluctuations is investigated with a simple spin like stochastic model. The effects of transcriptional fluctuations in protein synthesis is probed by coupling transcription and translation by an amplificative ... More
An Aggregation Model for Electrochemical Depostition and its Application to Cop Dendritic GrowthOct 21 1993We introduce an aggregation model for general electrochemical deposition experiments. Its most relevant feature is that it includes the overall effect of strong applied electric fields and therefore applies to non-equilibrium situations. We compare our ... More
Quantum unitary dynamics in cosmological spacetimesSep 21 2015We address the question of unitary implementation of the dynamics for scalar fields in cosmological scenarios. Together with invariance under spatial isometries, the requirement of a unitary evolution singles out a rescaling of the scalar field and a ... More
Predicting charged lepton flavor violation from 3-3-1 gauge symmetryFeb 26 2015Sep 09 2015The simplest realization of the inverse seesaw mechanism in a $SU(3)_C \otimes SU(3)_L \otimes U(1)_X$ gauge theory offers striking flavor correlations between rare charged lepton flavor violating decays and the measured neutrino oscillations parameters. ... More
Best Approximation Pair of Two Linear Varieties via an (In)Equality by (Fan-Todd) BeesackAug 03 2011The closest point of a linear variety to an external point is found by using the equality case of an Ostrowski's type inequality. This point is given in closed form as the quotient of a (formal) and a (scalar) Gram determinant. Then, the best approximation ... More
Convergence analysis of kernel LMS algorithm with pre-tuned dictionaryOct 31 2013The kernel least-mean-square (KLMS) algorithm is an appealing tool for online identification of nonlinear systems due to its simplicity and robustness. In addition to choosing a reproducing kernel and setting filter parameters, designing a KLMS adaptive ... More
Total Variation Restoration of Speckled Images Using a Split-Bregman AlgorithmMar 24 2009Multiplicative noise models occur in the study of several coherent imaging systems, such as synthetic aperture radar and sonar, and ultrasound and laser imaging. This type of noise is also commonly referred to as speckle. Multiplicative noise introduces ... More
The open quadrant problem: A topological proofFeb 27 2015Mar 04 2015In this work we present a new polynomial map $f:=(f_1,f_2):{\mathbb R}^2\to{\mathbb R}^2$ whose image is the open quadrant $\{x>0,y>0\}\subset{\mathbb R}^2$. The proof of this fact involves arguments of topological nature that avoid hard computer calculations. ... More
Unraveling the structure of treelike networks from first-passage times of lazy random walkersNov 08 2018Nov 21 2018We study the problem of random search in finite networks with a tree topology, where it is expected that the distribution of the first-passage time F(t) decays exponentially. We show that the slope of the exponential tail is independent of the initial ... More
Near Earth Object 2012XJ112 as a source of bright bolides of achondritic natureFeb 03 2014We analyze the likely link between the recently discovered Near Earth Object 2012XJ112 and a bright fireball observed over the south of Spain on December 27, 2012. The bolide, with an absolute magnitude of -9 +- 1, was simultaneously imaged during the ... More
On Local Optima in Learning Bayesian NetworksOct 19 2012This paper proposes and evaluates the k-greedy equivalence search algorithm (KES) for learning Bayesian networks (BNs) from complete data. The main characteristic of KES is that it allows a trade-off between greediness and randomness, thus exploring different ... More
Harris ProcessesOct 30 2005In this paper, we develop two stochastic models where the variable under consideration follows Harris distribution. The mean and variance of the processes are derived and the processes are shown to be non-stationary. In the second model, starting with ... More
Galois Theory, discriminants and torsion subgroups of elliptic curvesNov 10 2008Jun 30 2009We find a tight relationship between the torsion subgroup and the image of the mod 2 Galois representation associated to an elliptic curve defined over the rationals. This is shown using some characterizations for the squareness of the discriminant of ... More
The Universal Cardinal Ordering of Fixed PointsMar 06 2008We present the theorem which determines, by a permutation, the cardinal ordering of fixed points for any orbit of a period doubling cascade. The inverse permutation generates the orbit and the symbolic sequence of the orbit is obtained as a corollary. ... More
Dynamics of viscoelastic pipe flow in the maximum drag reduction limitAug 13 2018Polymer additives can substantially reduce the drag of turbulent flows and the upper limit, the so called "maximum drag reduction" (MDR) asymptote is universal, i.e. independent of the type of polymer and solvent used. Until recently, the consensus was ... More
Rejoinder to Article by Berger, Bernardo, and SunApr 27 2015Rejoinder to Overall Objective Priors by James O. Berger, Jose M. Bernardo, Dongchu Sun [arXiv:1504.02689]
Overall Objective PriorsApr 10 2015In multi-parameter models, reference priors typically depend on the parameter or quantity of interest, and it is well known that this is necessary to produce objective posterior distributions with optimal properties. There are, however, many situations ... More
Sparse domination and the strong maximal functionNov 03 2018We study the problem of dominating the dyadic strong maximal function by $(1, 1)$-type sparse forms based on rectangles with sides parallel to the axes, and show that such domination is impossible. Our proof relies on an explicit construction of a pair ... More