Listar MA - Artículos por tipo "info:eu-repo/semantics/publishedVersion"
Mostrando ítems 1-20 de 45
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A Curvature Inequality Characterizing Totally Geodesic Null Hypersurfaces
(Springer, 2023)A well-known application of the Raychaudhuri equation shows that, under geodesic completeness, totally geodesic null hypersurfaces are unique which satisfy that the Ricci curvature is nonnegative in the null direction. ... -
A discrete-time queueing system with three different strategies
(Elsevier, 2021-09)We consider a discrete-time Geo/G/1/inf system in which a customer that finishes its first essential service may opt to abandon the system, to receive a second optional service or to go at the head of the queue in order ... -
A general vertical decomposition of Euler equations: Multilayer-moment models
(Elsevier, 2022-09-13)In this work, we present a general framework for vertical discretizations of Euler equations. It generalizes the usual moment and multilayer models and allows to obtain a family of multilayer-moment models. It considers a ... -
A Hankel matrix acting on spaces of analytic functions.
(Springer, 2017-11-02)If μ is a positive Borel measure on the interval [0, 1) we let H_μ be the Hankel matrix { μ_{n,k} }_{n,k} with entries μ_{n,k} =μ_{n+k}, where, for μ_n denotes the moment of order n of μ. This matrix induces formally an ... -
A high dimensional functional time series approach to evolution outlier detection for grouped smart meters
(Taylor and Francis, 2022-01-01)Smart metering infrastructures collect data almost continuously in the form of fine-grained long time series. These massive data series often have common daily patterns that are repeated between similar days or seasons and ... -
A non markovian retrial queueing system
(Elsevier, 2023)This paper studies a discrete-time queueing system in which a customer who enters in the system with a server occupied may choose to go to the retrial group or to begin its service displacing to the retrial group the ... -
A proposal of a mixed diagnostic system based on decision trees and probabilistic experts rules
(2023)Decision trees and rule-based expert systems (RBES) are standard diagnostic tools. We propose a mixed technique that starts with a probabilistic decision tree where information is obtained from a real world data base. The ... -
An arriving decision problem in a discrete-time queueing system
(Springer, 2019-08)This paper discusses a discrete-time queueing system in which an arriving customer may adopt four different strategies; two of them correspond to a LCFS discipline where displacements or expulsions occur, and in the other ... -
An exact dynamic programming approach to segmented isotonic regression
(Elsevier, 2021)This paper proposes a polynomial-time algorithm to construct the monotone stepwise curve that minimizes the sum of squared errors with respect to a given cloud of data points. The fitted curve is also constrained on the ... -
Approaching the square of opposition in terms of the f-indexes of inclusion and contradiction
(Elsevier, 2023-10-31)We continue our research line on the analysis of the properties of the f-indexes of inclusion and contradiction; in this paper, specifically, we show that both notions can be related by means of the, conveniently reformulated, ... -
Association between exposure to air pollution and blood lipids in the general population of Spain.
(Wiley, 2023-09-23)Background and Aims: We aimed to assess the associations of exposure to air pollutants and standard and advanced lipoprotein measures, in a nationwide sample representative of the adult population of Spain.Methods: ... -
Comparing and Tuning Machine Learning Algorithms to Predict Type 2 Diabetes Mellitus
(Elsevier, 2023)The main goals of this work are to study and compare machine learning algorithms to predict the development of type 2 diabetes mellitus. Four classification algorithms have been considered, studying and comparing the ... -
Conformal Vector Fields and Null Hypersurfaces
(Springer, 2022-05-03)We give conditions for a conformal vector field to be tangent to a null hypersurface. We particularize to two important cases: a Killing vector field and a closed and conformal vector field. In the first case, we obtain a ... -
Connecting ideals in evolution algebras with hereditary subsets of its associated graph
(2023)In this article, we introduce a relation including ideals of an evo-lution algebra and hereditary subsets of vertices of its associated graph andestablish some properties among them. This relation allows us to determinemaximal ... -
Derivations and loops of some evolution algebras
(Springer, 2023)In this work we study the space of derivations of non-degenerate evolution algebras. We improve some results obtained recently in the literature and, as a consequence, we advance in the description of the derivations for ... -
Distributionally robust stochastic programs with side information based on trimmings
(Springer, 2021-11)We consider stochastic programs conditional on some covariate information, where the only knowledge of the possible relationship between the uncertain parameters and the covariates is reduced to a finite data sample of ... -
Electricity Cost-Sharing in Energy Communities Under Dynamic Pricing and Uncertainty
(IEEE, 2021-02-15)Most of the prosumers nowadays are constrained to trade only with the supplier under a flat tariff or dynamic time-of-use price signals. This paper models and discusses the cost-saving benefits of flexible prosumers as ... -
Fuzzy algebras of concepts
(MDPI, 2023-03-26)Preconcepts are basic units of knowledge that form the basis of formal concepts in formal concept analysis (FCA). This paper investigates the relations among different kinds of preconcepts, such as protoconcepts, meet and ... -
Fuzzy closure relations
(Elsevier, 2022-05-25)The concept of closure operator is key in several branches of mathematics. In this paper, closure operators are extended to relational structures, more specifically to fuzzy relations in the framework of complete fuzzy ... -
Fuzzy closure structures as formal concepts
(Elsevier, 2022-12-28)Galois connections seem to be ubiquitous in mathematics. They have been used to model solutions for both pure and application-oriented problems. Throughout the paper, the general framework is a complete fuzzy lattice over ...