• A discrete-time queueing system with three different strategies 

      Atencia-McKillop, Ivan; Padilla-Domínguez, Yolanda; Galán-García, José Luis; Aguilera-Venegas, Gabriel; Rodriguez-Cielos, Pedro; [et al.] (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 ...
    • An exact dynamic programming approach to segmented isotonic regression 

      Bucarey, Víctor; Labbé, Martine; Morales, Juan Miguel; Pineda, Salvador (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 ...
    • Chains in evolution algebras 

      Cabrera Casado, Yolanda; Cardoso Gonçalves, Maria Inez; Gonçalves, Daniel; Martin-Barquero, Dolores; Martin-Gonzalez, Candido (ELSEVIER, 2021-08-01)
      In this work we approach three-dimensional evolution algebras from certain constructions performed on two-dimensional algebras. More precisely, we provide four different constructions producing three-dimensional evolution ...
    • Conformal Vector Fields and Null Hypersurfaces 

      Atindogbé, Cyriaque; Olea, Benjamín (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 ...
    • Cost-driven screening of network constraints for the unit commitment problem 

      Porras, Álvaro; Pineda, Salvador; Morales, Juan Miguel; Jiménez-Cordero, Asunción (The Institute of Electrical and Electronics Engineers (IEEE), 2022-03-16)
      In an attempt to speed up the solution of the unit commitment (UC) problem, both machine-learning and optimization-based methods have been proposed to lighten the full UC formulation by removing as many superfluous line-flow ...
    • Distributionally robust stochastic programs with side information based on trimmings 

      Esteban-Pérez, Adrián; Morales, Juan Miguel (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 

      Gržanić, Mirna; Morales, Juan M.; Pineda Morente, Salvador; Capuder, Tomislav (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 ...
    • Feature-driven improvement of renewable energy forecasting and trading 

      Muñoz, Miguel Ángel; Morales, Juan Miguel; Pineda Morente, Salvador (2020-02-26)
      Inspired from recent insights into the common ground of machine learning, optimization and decision-making, this paper proposes an easy-to-implement, but effective procedure to enhance both the quality of renewable energy ...
    • Fuzzy closure relations 

      Ojeda Hernández, Manuel; Cabrera, Inma P.; Cordero, Pablo; Muñoz-Velasco, Emilio Jose (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 systems: Motivation, definition and properties 

      Ojeda Hernández, Manuel (Elsevier, 2022-09)
      The aim of this paper is to extend closure systems from being crisp sets with certain fuzzy properties to proper fuzzy sets. The presentation of the paper shows a thorough discussion on the different alternatives that ...
    • Inner Ideals of Real Simple Lie Algebras 

      Draper-Fontanals, Cristina; Meulewaeter, Jeroen (Springer, 2022-07-18)
      A classification up to automorphism of the inner ideals of the real finite-dimensional simple Lie algebras is given, jointly with precise descriptions in the case of the exceptional Lie algebras.
    • Inverse optimization with kernel regression: Application to the power forecasting and bidding of a fleet of electric vehicles 

      Fernández-Blanco, Ricardo; Morales, Juan Miguel; Pineda Morente, Salvador; Porras, Álvaro (Elsevier, 2021-10)
      This paper considers an aggregator of Electric Vehicles (EVs) who aims to learn the aggregate power of his/her fleet while also participating in the electricity market. The proposed approach is based on a data-driven inverse ...
    • Kitainik axioms do not characterize the class of inclusion measures based on contrapositive fuzzy implications 

      Madrid Labrador, Nicolás; Cornelis, Chris (Elsevier, 2022-05-17)
      In this short communication, we refute the conjecture by Fodor and Yager from [5] that the class of inclusion measures proposed by Kitainik coincides with that of inclusion measures based on contrapositive fuzzy implications. ...
    • Mean curvature of spacelike submanifolds in a Brinkmann spacetime 

      Cánovas, Verónica L.; Romero, Alfonso; Palomo-Ruiz, Francisco Jose (2021)
      Several geometric properties of complete spacelike submanifolds, with codimension at least two, in a Brinkmann spacetime are shown from natural assumptions involving the mean curvature vector field $\mcv$ of the spacelike ...
    • On projection methods for functional time series forecasting 

      Elías, Antonio; Jiménez, Raúl; Han Lin, Shang (ScienceDirect, 2022-05)
      Two nonparametric methods are presented for forecasting functional time series (FTS). The FTS we observe is a curve at a discrete-time point. We address both one-step-ahead forecasting and dynamic updating. Dynamic updating ...
    • On the existence of right adjoints for surjective mappings between fuzzy structures0 

      Cabrera, Inma P.; Cordero-Ortega, Pablo; García-Pardo, Francisca; Ojeda-Aciego, Manuel; De Baets, Bernard (National Research University Higher School of Economics, Russia, 2016)
      En este trabajo los autores continúan su estudio de la caracterización de la existencia de adjunciones (conexiones de Galois isótonas) cuyo codominio no está dotado de estructura en principio. En este artículo se considera ...
    • Partition-based distributionally robust optimization via optimal transport with order cone constraints 

      Esteban-Pérez, Adrián; Morales, Juan Miguel (Springer, 2021)
      In this paper we wish to tackle stochastic programs affected by ambiguity about the probability law that governs their uncertain parameters. Using optimal transport theory, we construct an ambiguity set that exploits the ...
    • Quasi-closed elements in fuzzy posets 

      Ojeda Hernández, Manuel; Cabrera, Inma P.; Cordero, Pablo (ELSEVIER, 2022-04)
      We generalize the notion of quasi-closed element to fuzzy posets in two stages: First, in the crisp style in which each element in a given universe either is quasi-closed or not. Second, in the graded style by defining ...
    • Rigidity results for complete spacelike submanifolds in plane fronted waves 

      Palomo-Ruiz, Francisco Jose; Pelegrín, José A. S.; Romero, Alfonso (Springer, 2022-09-08)
      New rigidity results for complete non-compact spacelike submanifolds of arbitrary codimension in plane fronted waves are obtained. Under appropriate assumptions, we prove that a complete spacelike submanifold in these ...
    • Smart Sensorization Using Propositional Dynamic Logic 

      Merino-Cordoba, Salvador; Burrieza-Muñiz, Alfredo; Guzman-Navarro, Francisco; Martinez, Javier (IOAP-MPDI, 2022-05-20)
      The current high energy prices pose a serious challenge, especially in the domestic economy. In this respect, one of the main problems is obtaining domestic hot water. For this reason, this article develops a heating system ...