Results for "Tamás Sándor Biró"

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Hadron Spectra Parameters within the Non-Extensive ApproachMay 21 2019We investigate how the non-extensive approach works in high-energy physics. Transverse momentum ($p_T$) spectra of several hadrons are fitted by various non-extensive momentum distributions and by the Boltzmann--Gibbs statistics.~It is shown that some ... More
Hadronization within Non-Extensive Approach and the Evolution of the ParametersMay 14 2019We review transverse momentum distributions of various identified charged particles stemming from high energy collisions fitted by various non-extensive distributions as well as by the usual Boltzmann-Gibbs statistics. We investigate the best-fit formula ... More
Application of the Non-extensive Statistical Approach to High Energy Particle CollisionsAug 04 2016In high-energy collisions the number of the created particles is far less than the thermodynamic limit, especially in small colliding systems (e.g. proton-proton). Therefore final-state effects and fluctuations in the one-particle energy distribution ... More
Multiplicity Dependence in the Non-Extensive Hadronization Model Calculated by the HIJING++ FrameworkMay 27 2019The non-extensive statistical description of the identified final state particles measured in high energy collisions is well-known by its wide range of applicability. However, there are many open questions that need to be answered, including but not limited ... More
Mass hierarchy and energy scaling of the Tsallis--Pareto parameters in hadron productions at RHIC and LHC energiesOct 25 2017The latest, high-accuracy identified hadron spectra measurements in high-energy nuclear collisions led us to the investigation of the strongly interacting particles and collective effects in small systems. Since microscopical processes result in a statistical ... More
Large cliques in graphs with high chromatic numberJul 13 2011We study graphs whose chromatic number is close to the order of the graph (the number of vertices). Both when the chromatic number is a constant multiple of the order and when the difference of the chromatic number and the order is a small fixed number, ... More
Systematic Analysis of the Non-extensive Statistical Approach in High Energy Particle Collisions - Experiment vs. TheoryFeb 09 2017Feb 24 2017The analysis of high-energy particle collisions is an excellent testbed for the non-extensive statistical approach. In these reactions we are far from the thermodynamical limit. In small colliding systems, such as electron-positron or nuclear collisions, ... More
Dynamical Stationarity as a Result of Sustained Random GrowthNov 21 2016In sustained growth with random dynamics stationary distributions can exist without detailed balance. This suggests thermodynamical behavior in fast growing complex systems. In order to model such phenomena we apply both a discrete and a continuous master ... More
On the variances of a spatial unit root modelJun 29 2010Sep 03 2010The asymptotic properties of the variances of the spatial autoregressive model $X_{k,\ell}=\alpha X_{k-1,\ell}+\beta X_{k,\ell-1}+\gamma X_{k-1,\ell-1}+\epsilon_{k,\ell}$ are investigated in the unit root case, that is when the parameters are on the boundary ... More
Special quadrature error estimates and their application in the hardy-littlewood majorant problemJul 27 2012The Hardy-Littlewood majorant problem has a positive answer only for expo- nents p which are even integers, while there are counterexamples for all p =2 2N. Montgomery conjectured that there exist counterexamples even among idempotent polynomials. This ... More
On connections between domain specific constants in some norm inequalitiesDec 12 2017We derive connections between optimal domain specific constants figuring in the Friedrichs-Velte inequality for conjugate harmonic functions, in the Babu\v{s}ka-Aziz inequality for the divergence and in the improved Poincar\'e inequality for the gradient. ... More
K-optimal designs for parameters of shifted Ornstein-Uhlenbeck processes and sheetsApr 19 2016Continuous random processes and fields are regularly applied to model temporal or spatial phenomena in many different fields of science, and model fitting is usually done with the help of data obtained by observing the given process at various time points ... More
Irrational centersNov 22 2010May 02 2011The main purpose of this article is to get a handle on determining how far a non-rational singularity is from being rational, or in other words, introduce a measure of the failure of a singularity being rational.
Signature coding for OR channel with asynchronous accessAug 03 2005Signature coding for multiple access OR channel is considered. We prove that in block asynchronous case the upper bound on the minimum code length asymptotically is the same as in the case of synchronous access.
Equilibrium distributions in entropy driven balanced processesJun 18 2016Nov 10 2016For entropy driven balanced processes we obtain final states with Poisson, Bernoulli, negative binomial and P\'olya distributions. We apply this both for complex networks and particle production. For random networks we follow the evolution of the degree ... More
Problem Solving in SpregoMar 05 2016Sprego is a programming tool for novice and end-user programmers within graphical spreadsheet environments. The main idea of Sprego is to use as few general purpose functions as possible, and based on these functions we create multilevel formulas to solve ... More
On the maximum values of the additive representation functionsApr 28 2015Jul 16 2015Let $A$ and $B$ be sets of nonnegative integers. For a positive integer $n$ let $R_{A}(n)$ denote the number of representations of $n$ as the sum of two terms from $A$. Let $\displaystyle s_{A}(x) = \max_{n \le x}R_{A}(n)$ and $\displaystyle d_{A,B}(x) ... More
A unified approach to equilibrium statistics in closed systems with random dynamicsJun 18 2016In a balanced version of decay and growth processes a simple master equation arrives at a final state including the Poisson, Bernoulli, negative binomial and P\'olya distribution. Such decay and growth rates incorporate a symmetry between the observed ... More
EPR Steering inequalities with Communication AssistanceMar 16 2016Mar 22 2016In this paper, we investigate the communication cost of reproducing Einstein-Podolsky-Rosen (EPR) steering correlations arising from bipartite quantum systems. We characterize the set of bipartite quantum states which admits a local hidden state model ... More
How science maps reveal knowledge transfer: new measurement for a historical caseJan 22 2014Modelling actors of science via science (overlay) maps has recently become a popular practice in Interdisciplinarity Research (IDR). The benefits of this toolkit have also been recognized for other areas of scientometrics, such as the study of science ... More
Three-term idempotent counterexamples in the Hardy-Littlewood majorant problemJun 02 2010Sep 20 2011The Hardy-Littlewood majorant problem was raised in the 30's and it can be formulated as the question whether $\int |f|^p\ge \int|g|^p$ whenever $\hat{f}\ge|\hat g|$. It has a positive answer only for exponents $p$ which are even integers. Montgomery ... More
K-optimal designs for parameters of shifted Ornstein-Uhlenbeck processes and sheetsApr 19 2016Oct 18 2016Continuous random processes and fields are regularly applied to model temporal or spatial phenomena in many different fields of science, and model fitting is usually done with the help of data obtained by observing the given process at various time points ... More
Probabilistic wind speed forecasting using Bayesian model averaging with truncated normal componentsMay 06 2013May 07 2013Bayesian model averaging (BMA) is a statistical method for post-processing forecast ensembles of atmospheric variables, obtained from multiple runs of numerical weather prediction models, in order to create calibrated predictive probability density functions ... More
On Mockenhoupt's Conjecture in the Hardy-Littlewood Majorant ProblemMar 11 2012The Hardy-Littlewood majorant problem has a positive answer only for expo- nents p which are even integers, while there are counterexamples for all p =2 2N. Montgomery conjectured that even among the idempotent polynomials there must exist some counterex- ... More
Centrality dependent Lévy-stable two-pion Bose-Einstein correlations at the PHENIX experimentJan 26 2018Investigation of femtoscopic correlation functions in relativistic heavy ion reactions is an important tool to access the space-time structure of particle production in the sQGP. The shape of the correlation functions is often assumed to be Gaussian, ... More
Connections between optimal constants in some norm inequalities for differential formsAug 20 2018Nov 19 2018We derive an improved Poincar\'e inequality in connection with the Babu\v{s}ka-Aziz and Friedrichs-Velte inequalities for differential forms by estimating the domain specific optimal constants figuring in the respective inequalities with each other provided ... More
About the temperature of moving bodiesMay 11 2009Jan 28 2010Relativistic thermodynamics is constructed from the point of view of special relativistic hydrodynamics. A relativistic four-current for heat and a general treatment of thermal equilibrium between moving bodies is presented. The different temperature ... More
Non-extensive statistics, relativistic kinetic theory and fluid dynamicsMay 28 2012Aug 08 2012Experimental particle spectra can be successfully described by power-law tailed energy distributions characteristic to canonical equilibrium distributions associated to R\'enyi's or Tsallis' entropy formula - over a wide range of energies, colliding system ... More
Splitting the source term for the Einstein equation to classical and quantum partsDec 04 2013May 04 2015We consider the special and general relativistic extensions of the action principle behind the Schr\"odinger equation distinguishing classical and quantum contributions. Postulating a particular quantum correction to the source term in the classical Einstein ... More
First order and stable relativistic dissipative hydrodynamicsSep 05 2011Feb 06 2012Relativistic thermodynamics is derived from kinetic equilibrium in a general frame. Based on a novel interpretation of Lagrange multipliers in the equilibrium state we obtain a generic stable but first order relativistic dissipative hydrodynamics. Although ... More
Dissipation flow-frames: particle, energy, thermometerMay 14 2013We associate the following physical co-mover conditions of to different frame choices: i) Eckart: particle flow, ii) Landau-Lifshitz: energy flow, iii) J\"uttner: moving thermometer frame. The role of fixing a flow-frame is analysed with respect to local ... More
Generating infinite random graphsMay 14 2012Mar 31 2017We define a growing model of random graphs. Given a sequence of nonnegative integers $\{d_n\}_{n=0}^\infty$ with the property that $d_i\leq i$, we construct a random graph on countably infinitely many vertices $v_0,v_1\ldots$ by the following process: ... More
A q-parameter bound for particle spectra based on black hole thermodynamics with Rényi-entropySep 17 2013By regarding the Hawking-Bekenstein entropy of Schwarzschild black hole horizons as a non-extensive Tsallis entropy, its formal logarithm, the R\'enyi entropy, is considered. The resulting temperature - horizon-radius relation has the same form as the ... More
Science and Facebook: the same popularity law!Jan 19 2017The distribution of scientific citations for publications selected with different rules (author, topic, institution, country, journal, etc.) collapse on a single curve if one plots the citations relative to their mean value. We find that the distribution ... More
Metric geometry of normal Kähler spaces, energy properness, and existence of canonical metricsApr 25 2016Let $(X,\omega)$ be a compact normal K\"ahler space. In this paper, the last in a sequence of works studying the relationship between energy properness and canonical K\"ahler metrics, we introduce a geodesic metric structure on $\mathcal H_{\omega}(X)$, ... More
Multilocal-realistic nonlinear dynamics of quantum collapseOct 21 2015Mar 11 2016A minimally nonlinear von Neumann equation for a Stern-Gerlach or Bell-type measuring apparatus, having a scalar product structure over the configuration space, i.e. a sum of locally acting terms, is shown to display a competition for survival between ... More
Quantum randomness emerging under gravitational nonlinearityApr 08 2002A scenario is outlined for quantum measurement, assuming that self-sustaining classicality is the consequence of an attractive gravitational self-interaction acting on massive bodies, and randomness arises already in the classical domain. A simple solvable ... More
Minimal clones with few majority operationsFeb 10 2011We characterize minimal clones generated by a majority function containing at most seven ternary operations.
Braid-positive Legendrian linksAug 18 2006Any link that is the closure of a positive braid has a natural Legendrian representative. These were introduced in an earlier paper, where their Chekanov--Eliashberg contact homology was also evaluated. In this paper we re-phrase and improve that computation ... More
Moments of general time dependent branching processes with applicationsJul 02 2018May 08 2019In this paper, we give sufficient conditions for a Crump-Mode-Jagers process to be bounded in $L_k$ for a given $k>1$. This result is then applied to a recent random graph process motivated by pairwise collaborations and driven by time-dependent branching ... More
Entropic Distance for Nonlinear Master EquationNov 07 2017More and more works deal with statistical systems far from equilibrium, dominated by unidirectional stochastic processes augmented by rare resets. We analyze the construction of the entropic distance measure appropriate for such dynamics. We demonstrate ... More
Moments of general time dependent branching processes with applicationsJul 02 2018In this paper, we give sufficient conditions for a Crump-Mode-Jagers process to be bounded in $L_k$ for a given $k>1$. This result is then applied to a recent random graph process motivated by pairwise collaborations and driven by time-dependent branching ... More
Maximal Thurston-Bennequin number of +adequate linksOct 22 2006The class of +adequate links contains both alternating and positive links. Generalizing results of Tanaka (for the positive case) and Ng (for the alternating case), we construct fronts of an arbitrary +adequate link A so that the diagram has a ruling, ... More
One parameter families of Legendrian torus knotsSep 01 2004We compute the Chekanov-Eliashberg contact homology of what we call the Legendrian closure of a positive braid. We also construct an augmentation for each such link diagram. Then we apply the monodromy techniques established in an earlier paper to a certain ... More
Minimal clones generated by majority operationsFeb 08 2011We determine all majority operations on a four-element set that generate a minimal clone.
The asymptotic distance between an ultraflat unimodular polynomial and its conjugate reciprocalOct 09 2018Feb 12 2019Let $${\mathcal K}_n := \left\{p_n: p_n(z) = \sum_{k=0}^n{a_k z^k}, \enspace a_k \in {\mathbb C}\,,\enspace |a_k| = 1 \right\}\,.$$ A sequence $(P_n)$ of polynomials $P_n \in {\mathcal K}_n$ is called ultraflat if $(n + 1)^{-1/2}|P_n(e^{it})|$ converge ... More
Inner products on the Hecke algebra of the braid groupJun 30 2009We point out that the Homfly polynomial (that is to say, Ocneanu's trace functional) contains two polynomial-valued inner products on the Hecke algebra representation of Artin's braid group. These bear a close connection to the Morton-Franks-Williams ... More
Objective thermomechanicsOct 27 2015Dec 21 2015An irreversible thermodynamical theory of solids is presented where the kinematic quantities are defined in an automatically objective way. Namely, auxiliary elements like reference frame, reference time and reference configuration are avoided by formulating ... More
Large 2-coloured matchings in 3-coloured complete hypergraphsMar 11 2011Sep 12 2012We prove a generalized Ramsey-type result on large 2-coloured matchings in a 3-coloured complete 3-uniform hypergraph, supporting a conjecture by A. Gy\'arf\'as.
On extensions of completely simple semigroups by groupsAug 14 2013An example of an extension of a completely simple semigroup U by a group H is given which cannot be embedded into the wreath product of U by H. On the other hand, every central extension of U by H is shown to be embeddable in the wreath product of U by ... More
PHENIX results on three-particle Bose-Einstein correlations in $\sqrt{S_{NN}} = 200$ GeV Au+Au collisionsJan 10 2018Bose-Einstein correlations of identical hadrons reveal information about hadron creation from the strongly interacting matter formed in ultrarelativistic heavy ion collisions. The measurement of three-particle correlations may in particular shed light ... More
Are lines much bigger than line segments?Sep 21 2014Oct 05 2015We pose the following conjecture: (*) If A is the union of line segments in R^n, and B is the union of the corresponding full lines then the Hausdorff dimensions of A and B agree. We prove that this conjecture would imply that every Besicovitch set (compact ... More
Analytic rigidity of K-trivial extremal contractions of smooth 3-foldsApr 01 2002We discuss the problem of classifying birational extremal contractions of smooth threefolds where the canonical bundle is trivial along the curves contracted, in the case when a divisor is contracted to a point. We prove the analytic rigidity of the contraction ... More
Pathwise approximation of Feynman path integrals using simple random walksMar 20 2018The aim of the presented research is to give a rigorous mathematical approach to Feynman path integrals based on strong (pathwise) approximations based on simple random walks.
Random cherry graphsJul 04 2018Due to the popularity of randomly evolving graph processes, there exists a randomized version of many recursively defined graph models. This is also the case with the cherry tree, which was introduced by Buksz\'ar and Pr\'ekopa to improve Bonferroni type ... More
Interaction-free measurement and forward scatteringApr 23 1998Interaction-free measurement is shown to arise from the forward-scattered wave accompanying absorption: a "quantum silhouette" of the absorber. Accordingly, the process is not free of interaction. For a perfect absorber the forward-scattered wave is locked ... More
Arestov's theorems on Bernstein's inequalityApr 26 2019We give a simple, elementary, and at least partially new proof of Arestov's famous extension of Bernstein's inequality in $L_p$ to all $p \geq 0$. Our crucial observation is that Boyd's approach to prove Mahler's inequality for algebraic polynomials $P_n ... More
Reverse Markov- and Bernstein-type inequalities for incomplete polynomialsSep 20 2018Let ${\mathcal P}_k$ denote the set of all algebraic polynomials of degree at most $k$ with real coefficients. Let ${\mathcal P}_{n,k}$ be the set of all algebraic polynomials of degree at most $n+k$ having exactly $n+1$ zeros at $0$. Let $$\|f\|_A := ... More
The sharp Remez-type inequality for even trigonometric polynomials on the periodSep 20 2018We prove that $$\max_{t \in [-\pi,\pi]}{|Q(t)|} \leq T_{2n}(\sec(s/4)) = \frac 12 ((\sec(s/4) + \tan(s/4))^{2n} + (\sec(s/4) - \tan(s/4))^{2n})$$ for every even trigonometric polynomial $Q$ of degree at most $n$ with complex coefficients satisfying $$m(\{t ... More
Almost associative operations generating a minimal cloneFeb 10 2011Characterizations of "almost associative" binary operations generating a minimal clone are given for two interpretations of the term "almost associative". One of them uses the associative spectrum, the other one uses the index of nonassociativity to measure ... More
Application of Operator Splitting to Solve Reaction Diffusion EquationsNov 22 2010Mar 22 2011Approximate solutions of the Fisher equation obtained by different splitting methods are investigated. The error of this nonlinear problem is analyzed. The order of different splitting methods coupled with numerical methods of different order is calculated ... More
On multidimensional item response theory -- a coordinate free approachJul 19 2007A coordinate system free definition of complex structure multidimensional item response theory (MIRT) for dichotomously scored items is presented. The point of view taken emphasizes the possibilities and subtleties of understanding MIRT as a multidimensional ... More
Self-intersection local time of planar Brownian motion based on a strong approximation by random walksAug 05 2010Mar 02 2011The main purpose of this work is to define planar self-intersection local time by an alternative approach which is based on an almost sure pathwise approximation of planar Brownian motion by simple, symmetric random walks. As a result, Brownian self-intersection ... More
The splitting principle and singularitiesAug 07 2011The splitting principle states that morphisms in a derived category do not "split" accidentally. This has been successsfully applied in several characterizations of rational, DB, and other singularities. In this article I prove a general statement that ... More
Singularities of stable varietiesFeb 07 2011Jan 23 2012This is a survey on recent results regarding singularities that occur on higher dimensional stable varieties.
The Complexity of MaxMin Length TriangulationAug 01 2012In 1991, Edelsbrunner and Tan gave an O(n^2) algorithm for finding the MinMax Length triangulation of a set of points in the plane. In this paper we resolve one of the open problems stated in that paper, by showing that finding a MaxMin Length triangulation ... More
Logarithmic Kodaira-Akizuki-Nakano vanishing and Arakelov-Parshin boundedness for singular varietiesMar 03 2000Apr 30 2000The article has two parts. The first part is devoted to proving a singular version of the logarithmic Kodaira-Akizuki-Nakano vanishing theorem of Esnault and Viehweg. This is then used to prove other vanishing theorems. In the second part these vanishing ... More
Representing regular pseudocomplemented Kleene algebras by tolerance-based rough setsOct 31 2016Jun 11 2017We show that any regular pseudocomplemented Kleene algebra defined on an algebraic lattice is isomorphic to a rough set Kleene algebra determined by a tolerance induced by an irredundant covering.
The intuitive definition of Du Bois singularitiesSep 26 2011Oct 03 2011It is proved that for projective varieties having Du Bois singularities is equivalent to the condition that the coherent cohomology groups of the structure sheaf coincide with the appropriate Hodge components of the singular cohomology groups.
Censored and shifted gamma distribution based EMOS model for probabilistic quantitative precipitation forecastingDec 13 2015Apr 01 2016Recently all major weather prediction centres provide forecast ensembles of different weather quantities which are obtained from multiple runs of numerical weather prediction models with various initial conditions and model parametrizations. However, ... More
On the optimal designs for the prediction of complex Ornstein-Uhlenbeck processesAug 10 2018Physics, chemistry, biology or finance are just some examples out of the many fields where complex Ornstein-Uhlenbeck (OU) processes have various applications in statistical modelling. They play role e.g. in the description of the motion of a charged ... More
On the conditions of fixed-point theorems concerning $F$-contractionsSep 25 2017We prove a fixed-point theorem that generalises and simplifies a number of results in the theory of $F$-contractions. We show that all of the previously imposed conditions on the operator can be either omitted or relaxed. Furthermore, our result is formulated ... More
Representation of Nelson Algebras by Rough Sets Determined by QuasiordersJul 07 2010Feb 19 2011In this paper, we show that every quasiorder $R$ induces a Nelson algebra $\mathbb{RS}$ such that the underlying rough set lattice $RS$ is algebraic. We note that $\mathbb{RS}$ is a three-valued {\L}ukasiewicz algebra if and only if $R$ is an equivalence. ... More
Weak Geodesic Rays in the Space of Kähler Metrics and the Class E(X,ω_0)Jul 25 2013Nov 14 2013Suppose (X,\omega_0) is a compact K\"ahler manifold. In the present work we propose a simple construction for weak geodesic rays in the space of K\"ahler metrics that seems to be tied together with properties of the class E(X,\omega_0). As an application ... More
On $\ell^{p}$-like equivalence relationsNov 14 2009For $f \colon [0,1] \rar \real^{+}$, consider the relation $\mathbf{E}_{f}$ on $[0,1]^{\omega}$ defined by $(x_{n}) \mathbf{E}_{f} (y_{n}) \Leftrightarrow \sum_{n < \omega} f(|y_{n} - x_{n}|) < \infty.$ We study the Borel reducibility of Borel equivalence ... More
Combining predictive distributions for statistical post-processing of ensemble forecastsJul 27 2016Weather predictions typically take the form of forecast ensembles obtained from multiple runs of numerical weather prediction models with varying initial conditions and model physics. Due to systematic biases and errors in calibration, ensemble forecasts ... More
Joint probabilistic forecasting of wind speed and temperature using Bayesian model averagingApr 14 2014Ensembles of forecasts are typically employed to account for the forecast uncertainties inherent in predictions of future weather states. However, biases and dispersion errors often present in forecast ensembles require statistical post-processing. Univariate ... More
Efficient weight vectors from pairwise comparison matricesFeb 10 2016Nov 10 2016Pairwise comparison matrices are frequently applied in multi-criteria decision making. A weight vector is called efficient if no other weight vector is at least as good in approximating the elements of the pairwise comparison matrix, and strictly better ... More
Optimal designs for parameters of shifted Ornstein-Uhlenbeck sheets measured on monotonic setsNov 30 2013Measurement on sets with a specific geometric shape can be of interest for many important applications (e.g. measurement along the isotherms in structural engineering). In the present paper the properties of optimal designs for estimating the parameters ... More
Mixture EMOS model for calibrating ensemble forecasts of wind speedJul 23 2015Dec 11 2015Ensemble model output statistics (EMOS) is a statistical tool for post-processing forecast ensembles of weather variables obtained from multiple runs of numerical weather prediction models in order to produce calibrated predictive probability density ... More
Combining predictive distributions for statistical post-processing of ensemble forecastsJul 27 2016Nov 16 2016Weather predictions typically take the form of forecast ensembles obtained from multiple runs of numerical weather prediction models with varying initial conditions and model physics. Due to systematic biases and errors in calibration, ensemble forecasts ... More
Computing discrete logarithm by interval-valued paradigmApr 01 2014Interval-valued computing is a relatively new computing paradigm. It uses finitely many interval segments over the unit interval in a computation as data structure. The satisfiability of Quantified Boolean formulae and other hard problems, like integer ... More
An explicit solution for optimal investment problems with autoregressive prices and exponential utilityJan 07 2015We calculate explicitly the optimal strategy for an investor with exponential utility function when the stock price follows an autoregressive Gaussian process. We also calculate its performance and analyse it when the trading horizon tends to infinity. ... More
Towards meta-interpretive learning of programming language semanticsJul 20 2019We introduce a new application for inductive logic programming: learning the semantics of programming languages from example evaluations. In this short paper, we explored a simplified task in this domain using the Metagol meta-interpretive learning system. ... More
Incomplete Analytic Hierarchy Process with Minimum Ordinal ViolationsApr 09 2019Pairwise comparisons offer a natural way of expressing the preferences of the decision makers. Complete and incomplete pairwise comparison matrices have been applied in multi-criteria decision making, as well as in scoring and ranking. Although ordinal ... More
Prime filter structures of pseudocomplemented Kleene algebras and representation by rough setsJun 24 2018May 12 2019We introduce Kleene-Varlet spaces as partially ordered sets equipped with a polarity satisfying certain additional conditions. By applying Kleene-Varlet spaces, we prove that each regular pseudocomplemented Kleene algebra is isomorphic to a subalgebra ... More
Bivariate ensemble model output statistics approach for joint forecasting of wind speed and temperatureJul 13 2015Jul 27 2015Forecast ensembles are typically employed to account for prediction uncertainties in numerical weather prediction models. However, ensembles often exhibit biases and dispersion errors, thus they require statistical post-processing to improve their predictive ... More
Log-normal distribution based EMOS models for probabilistic wind speed forecastingJul 11 2014Ensembles of forecasts are obtained from multiple runs of numerical weather forecasting models with different initial conditions and typically employed to account for forecast uncertainties. However, biases and dispersion errors often occur in forecast ... More
The cone of curves of K3 surfaces revistedSep 22 2013The main theorem of "S. J. Kov\'acs: The cone of curves of a K3 surface, Math. Ann. 300 (1994), no. 4, 681-691" is proved in arbitrary characteristic. The proof is essentially the same as in the original paper where it was stated only over the complex ... More
Steenbrink vanishing extendedJul 29 2013Aug 19 2013The notion of DB index, a measure of how far a singularity of a pair is from being Du Bois, is introduced and used to generalize vanishing theorems of Steenbrink and others with simpler and more natural proofs than the originals.
Prime filter structures of pseudocomplemented Kleene algebras and representation of rough setsJun 24 2018Mar 02 2019We introduce Kleene-Varlet spaces as partially ordered sets equipped with a polarity satisfying certain additional conditions. By applying Kleene-Varlet spaces, we prove that each pseudocomplemented Kleene algebra is isomorphic to a subalgebra of the ... More
Complex activity patterns generated by short-term synaptic plasticityMar 14 2018Short-term synaptic plasticity (STSP) affects the efficiency of synaptic transmission for persistent presynaptic activities. We consider attractor neural networks, for which the attractors are given, in the absence of STSP, by cell assemblies of excitatory ... More
Parameter estimation in linear regression driven by a Gaussian sheetNov 09 2011The problem of estimating the parameters of a linear regression model $Z(s,t)=m_1g_1(s,t)+ \cdots + m_pg_p(s,t)+U(s,t)$ based on observations of $Z$ on a spatial domain $G$ of special shape is considered, where the driving process $U$ is a Gaussian random ... More
The (logarithmic) least squares optimality of the arithmetic (geometric) mean of weight vectors calculated from all spanning trees for incomplete additive (multiplicative) pairwise comparison matricesJan 16 2017Apr 04 2019Complete and incomplete additive/multiplicative pairwise comparison matrices are applied in preference modelling, multi-attribute decision making and ranking. The equivalence of two well known methods is proved in this paper. The arithmetic (geometric) ... More
Monteiro spaces and rough sets determined by quasiorder relations: Models for Nelson algebrasDec 31 2013Feb 10 2014Rough sets induced by quasiorders appear in several constructions using binary relations in computer science. In this paper, a structural characterisation of rough sets induced by quasiorders is given. These rough sets form Nelson algebras defined on ... More
Large chromatic number and Ramsey graphsMar 21 2011Apr 10 2012Let Q(n,c) denote the minimum clique size an n-vertex graph can have if its chromatic number is c. Using Ramsey graphs we give an exact, albeit implicit, formula for the case c is at least (n+3)/2.
Efficient weight vectors from pairwise comparison matricesFeb 10 2016Feb 25 2016Pairwise comparison matrices are frequently applied in multi-criteria decision making. A weight vector is called efficient if no other weight vector is at least as good in approximating the elements of the pairwise comparison matrix, and strictly better ... More
DB pairs and vanishing theoremsSep 18 2010Jan 13 2011The main purpose of this article is to define the notion of DuBois singularities for pairs and proving a vanishing theorem using this new notion. The main vanishing theorem specializes to a new vanishing theorem for resolutions of log canonial singularities. ... More
Tolerances induced by irredundant coveringsApr 21 2014Feb 01 2015In this paper, we consider tolerances induced by irredundant coverings. Each tolerance $R$ on $U$ determines a quasiorder $\lesssim_R$ by setting $x \lesssim_R y$ if and only if $R(x) \subseteq R(y)$. We prove that for a tolerance $R$ induced by a covering ... More
Disentangling Soft and Hard Hadron Yields in PbPb Collisions at $\sqrt{s_{NN}}$ = 2.76 ATeVMay 15 2014May 16 2014We demonstrate that charged pion spectra in central and peripheral PbPb collisions at $\sqrt{s}$ = 2.76 ATeV obtained via perturbative quantum chromodynamics improved parton model calculations [17] can be approximated by the Tsallis distribution for transverse ... More