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Listar por autor "Ojeda Hernández, Manuel"
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A Formal Concept Analysis approach to hierarchical description of malware threats
Ojeda Hernández, Manuel; López-Rodríguez, Domingo; Mora, Angel (2024-07-04)The problem of intelligent malware detection has become increasingly relevant in the industry, as there has been an explosion in the diversity of threats and attacks that affect not only small users, but also large ... -
Analysis of Fuzzy Vector Spaces as an Algebraic Framework for Flag Codes
Bejines-López, Carlos; Ojeda Hernández, Manuel; López-Rodríguez, Domingo (MDPI, 2024)Flag codes are a recent network coding strategy based on linear algebra. Fuzzy vector subspaces extend the notions of classical linear algebra. They can be seen as abstractions of flags to the point that several fuzzy ... -
Closure Structures as fixed points of some Galois connections.
Ojeda Hernández, Manuel; De-las-Peñas-Cabrera, Inmaculada; Cordero-Ortega, Pablo; Muñoz-Velasco, Emilio José (2023)The starting point of this work is a published paper where the fuzzy powerset of a fuzzy lattice A, the set of isotone mappings on A and the set of isotone total relations on A were proved to be related by three fuzzy ... -
Counting semicopulas on finite structures
Bejines-López, Carlos; Ojeda Hernández, Manuel (Elsevier, 2022)Semicopulas are the operators chosen to model conjunction in the fuzzy/many-valued logics. In fact, a special kind of semicopula, called t-norm, is widely used in many applications of logic to engineering, computer science ... -
Estructuras de clausura y elementos cuasi-cerrados sobre retículos completos difusos.
Ojeda Hernández, Manuel (UMA Editorial, 2023)Esta tesis doctoral se enmarca en el campo de la lógica difusa. El tema principal de la disertación es la extensión de las estructuras de clausura difusas y los elementos cuasi-cerrados a un retículo completo difuso ... -
Estudio de operadores discretos definidos sobre cadenas finitas.
En la lógica clásica, los predicados son binarios y toman valores de verdad de 0 o 1, que se corresponden con falso y verdadero, respectivamente. Sin embargo, en la mayoría de las veces, el razonamiento humano y muchos ... -
Fuzzy algebras of concepts
Ojeda Hernández, Manuel; López-Rodríguez, Domingo; Cordero-Ortega, Pablo (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
Ojeda Hernández, Manuel; Cabrera, Inma P.; Cordero-Ortega, Pablo; Muñoz-Velasco, Emilio José (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 José (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 Structures as Formal Concepts II
Ojeda Hernández, Manuel; De-las-Peñas-Cabrera, Inmaculada; Cordero-Ortega, Pablo; Muñoz-Velasco, Emilio José (Elsevier, 2023-09-24)This paper is the natural extension of Fuzzy Closure Structures as Formal Concepts. In this paper we take into consideration the concept of closure system which is not dealt with in the previous one. Hence, a connection must ... -
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 ... -
Lexicon-based sentiment analysis in texts using Formal Concept Analysis
Ojeda Hernández, Manuel; López-Rodríguez, 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 ... -
Lexicon-based sentiment analysis in texts using Formal Concept Analysis.
Ojeda Hernández, Manuel; López-Rodríguez, Domingo; Mora-Bonilla, Ángel (Elsevier, 2023-02-03)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 ...