Listar por autor "Cordero-Ortega, Pablo"
Mostrando ítems 1-20 de 32
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A conversational recommender system for diagnosis using fuzzy rules.
Cordero-Ortega, Pablo
; Enciso-García-Oliveros, Manuel; López-Rodríguez, Domingo; Mora-Bonilla, Ángel (Elsevier, 2020-09-15)
Graded implications in the framework of Fuzzy Formal Concept Analysis are used as the knowledge guiding the recommendations. An automated engine based on fuzzy Simplification Logic is proposed to make the suggestions to ... -
A generalized framework to consider positive and negative attributes in formal concept analysis
Rodríguez Jiménez, José Manuel; Cordero-Ortega, Pablo; Enciso-García-Oliveros, Manuel; Mora-Bonilla, Ángel (2014-10-23)
In Formal Concept Analysis the classical formal context is analized taking into account only the positive information, i.e. the presence of a property in an object. Nevertheless, the no presence of a property in an object ... -
A logic-based approach to compute a direct basis from implications
Cordero-Ortega, Pablo; Enciso-García-Oliveros, Manuel; Mora-Bonilla, Ángel; Ojeda-Aciego, Manuel; Rodríguez-Lorenzo, Estrella (2014-09-19)
Formal Concept Analysis is an emergent area in the topic of data analysis based on lattice theory. In this framework, a context is defined as the relation between a set of objects and a set of attributes and from here it ... -
Attribute implications with unknown information based on weak Heyting algebras
Cordero-Ortega, Pablo; Enciso-García-Oliveros, Manuel; Mora, Angel; Pérez-Gámez, Francisco (Elsevier, 2024-08)
Simplification logic, a logic for attribute implications, was originally defined for Boolean sets. It was extended to distributive fuzzy sets by using a complete dual Heyting algebra. In this paper, we weaken this restriction ... -
CAISL: Simplification Logic for Conditional Attribute Implications
Mora-Bonilla, Ángel; Cordero-Ortega, Pablo; Enciso-García-Oliveros, Manuel; Rodríguez-Lorenzo, Estrella; Missaoui, Nokia (2016-07-25)
In this work, we present a sound and complete axiomatic system for conditional attribute implications (CAIs) in Triadic Concept Analysis (TCA). Our approach is strongly based on the Simplification paradigm which offers a ... -
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 ... -
Estructuras de clausura y elementos cuasi-cerrados sobre retículos completos difusos.
(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 ... -
Extending FuzAtAnalyzer to approach the management of classical negation
Rodríguez-Jiménez, J.M.; Cordero-Ortega, Pablo; Enciso-García-Oliveros, Manuel; Mora-Bonilla, Ángel (2015-09-16)
FuzAtAnalyzer was conceived as a Java framework which goes beyond of classical tools in formal concept analysis. Specifically, it successfully incorporated the management of uncertainty by means of methods and tools from ... -
Extracción de conocimiento usando atributos negativos en el Análisis de Conceptos Formales. Aplicaciones en la Ingeniería.
(UMA Editorial, 2017-06-19)El objetivo principal de esta tesis es desarrollar un marco general que permita, de una forma uniforme y eficiente, extraer, tratar y representar conocimiento a partir de información positiva y negativa de un conjunto de ... -
fcaR, Formal Concept Analysis with R.
Cordero-Ortega, Pablo; Enciso-García-Oliveros, Manuel; López-Rodríguez, Domingo; Mora-Bonilla, Ángel (The R Foundation, 2022)
Formal concept analysis (FCA) is a solid mathematical framework to manage information based on logic and lattice theory. It defines two explicit representations of the knowledge present in a dataset as concepts and ... -
From an implicational system to its corresponding D-basis
Rodríguez-Lorenzo, Estrella; Adaricheva, Kira; Cordero-Ortega, Pablo; Enciso-García-Oliveros, Manuel; Mora-Bonilla, Ángel (2015-10-30)
Closure system is a fundamental concept appearing in several areas such as databases, formal concept analysis, artificial intelligence, etc. It is well-known that there exists a connection between a closure operator on a ... -
Fuzzy Adjunctions revisited
Cabrera, Inma P.; Cordero-Ortega, Pablo; De Baets, Bernard; García-Pardo, Francisca; Ojeda-Aciego, Manuel (2016-05-30)
En este trabajo se intenta obtener la noción de adjunción más débil entre estructuras difusas. Este trabajo continúa la línea de investigación en el estudio y construcción d adjunciones que han realizado los autores en ... -
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; De-las-Peñas-Cabrera, Inmaculada; Cordero-Ortega, Pablo; Muñoz-Velasco, Emilio José (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 ... -
Fuzzy relational Galois connections between fuzzy transitive digraphs
De-las-Peñas-Cabrera, Inmaculada; Cordero-Ortega, Pablo; Muñoz-Velasco, Emilio José; Ojeda-Aciego, Manuel; De Baets, Bernard (Elsevier, 2022-12-28)
We present a fuzzy version of the notion of relational Galois connection between fuzzy transitive directed graphs (fuzzy T-digraphs) on the specific setting in which the underlying algebra of truth values is a complete ... -
Inference of mixed information in Formal Concept Analysis
Mora-Bonilla, Ángel; Cordero-Ortega, Pablo; Enciso-García-Oliveros, Manuel; Rodríguez, Jose Manuel (2017-10-10)
Negative information can be considered twofold: by means of a negation operator or by capturing the absence of information. In this second approach, a new framework have to be developed: from the syntax to the semantics, ... -
Información desconocida en análisis de conceptos formales.
(UMA Editorial, 2024)Esta tesis está enmarcada en el área de Análisis de Conceptos Formales (FCA, Formal Concept Analysis). FCA extrae, representa y manipula conocimiento implícito en un contexto formal, que es una relación binaria entre objetos ...