Listar por autor "Ojeda Hernández, Manuel"
Mostrando ítems 1-5 de 5
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Fuzzy closure relations
Ojeda Hernández, Manuel; Cabrera, Inma P.; Cordero-Ortega, 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 structures as formal concepts
Ojeda Hernández, Manuel; De-las-Peñas-Cabrera, Inmaculada; Cordero-Ortega, Pablo; Muñoz-Velasco, Emilio Jose (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 ... -
Fuzzy closure systems: Motivation, definition and properties
(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 ... -
Lexicon-based sentiment analysis in texts using Formal Concept Analysis
Ojeda Hernández, Manuel; Lopez-Rodriguez, Domingo; Mora, Angel (Elsevier, 2023)
In this paper, we present a novel approach for sentiment analysis that uses Formal Concept Analysis (FCA) to create dictionaries for classification. Unlike other methods that rely on pre-defined lexicons, our approach ... -
Quasi-closed elements in fuzzy posets
Ojeda Hernández, Manuel; Cabrera, Inma P.; Cordero-Ortega, 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 ...