Now showing items 1-20 of 36

    • A formal context for acyclic join dependencies 

      Baixeries i Juvillà, Jaume (2017)
      Article
      Open Access
      Acyclic Join Dependencies (AJD) play a crucial role in database design and normalization. In this paper, we use Formal Concept Analysis (FCA) to characterize a set of AJDs that hold in a given dataset. This present work ...
    • A Lattice Representation of Relations, Multivalued Dependencies and Armstrong Relations 

      Baixeries i Juvillà, Jaume; Balcázar Navarro, José Luis (2005)
      Conference report
      Restricted access - publisher's policy
      We present a lattice-base formalism to relate, in a novel way, different representation methods for relational data. Specifically, relations given extensionally by tuples, multivalued dependencies, and Armstrong relations ...
    • A New Formal Context for Symmetric Dependencies 

      Baixeries i Juvillà, Jaume (2011)
      Conference report
      Open Access
      In this paper we present a new formal context for symmetric dependencies. We study its properties and compare it with previous approaches. We also discuss how this new context may open the door to solve some open problems ...
    • Characterization and Armstrong relations for Degenerated Multivalued Dependencies using Formal Concept Analysis 

      Baixeries i Juvillà, Jaume; Balcázar Navarro, José Luis (Springer, 2005)
      Conference report
      Restricted access - publisher's policy
      Functional dependencies, a notion originated in Relational Database Theory, are known to admit interesting characterizations in terms of Formal Concept Analysis. In database terms, two successive, natural extensions of ...
    • Characterization of database dependencies with FCA and pattern structures 

      Baixeries i Juvillà, Jaume; Kaytoue, Mehdi; Napoli, Amedeo (Springer International Publishing, 2014-04-12)
      Part of book or chapter of book
      Restricted access - publisher's policy
      In this review paper, we present some recent results on the characterization of Functional Dependencies and variations with the formalism of Pattern Structures and Formal Concept Analysis. Although these dependencies ...
    • Characterization of order-like dependencies with formal concept analysis 

      Codocedo, Victor; Baixeries i Juvillà, Jaume; Kaytoue, Mehdi; Napoli, Amedeo (2011)
      Conference report
      Open Access
      Functional Dependencies (FDs) play a key role in many fields of the relational database model, one of the most widely used database systems. FDs have also been applied in data analysis, data quality, knowl- edge discovery ...
    • characterization of order-like dependencies with formal concept analysis 

      Baixeries i Juvillà, Jaume; Napoli, Amedeo; Kaytoue, Mehdi; Codecedo, Victor (2016)
      Conference report
      Open Access
      Functional Dependencies (FDs) play a key role in many fields of the relational database model, one of the most widely used database systems. FDs have also been applied in data analysis, data quality, knowledge discovery ...
    • Characterizing approximate-matching dependencies in formal concept analysis with pattern structures 

      Baixeries i Juvillà, Jaume; Codocedo, Victor; Kaytoue, Mehdi; Napoli, Amedeo (2018-04-26)
      Article
      Open Access
      Functional dependencies (FDs) provide valuable knowledge on the relations between attributes of a data table. A functional dependency holds when the values of an attribute can be determined by another. It has been shown ...
    • Characterizing covers of functional dependencies using FCA 

      Codocedo, Victor; Baixeries i Juvillà, Jaume; Kaytoue, Mehdi; Napoli, Amedeo (2018)
      Conference report
      Open Access
      Functional dependencies (FDs) can be used for various important operations on data, for instance, checking the consistency and the quality of a database (including databases that contain complex data). Consequently, a ...
    • Characterizing functional dependencies in formal concept analysis with pattern structures 

      Baixeries i Juvillà, Jaume; Kaytoue, Mehdi; Napoli, Amedeo (2014-01-29)
      Article
      Restricted access - publisher's policy
      Computing functional dependencies from a relation is an important database topic, with many applications in database management, reverse engineering and query optimization. Whereas it has been deeply investigated in those ...
    • Computing Functional Dependencies with Pattern Structures 

      Baixeries i Juvillà, Jaume; Kaytoue, Mehdi; Napoli, Amedeo (2012)
      Conference report
      Open Access
      The treatment of many-valued data with FCA has been achieved by means of scaling. This method has some drawbacks, since the size of the resulting formal contexts depends usually on the number of di erent values that are ...
    • Contributions to the formalization of order-like dependencies using FCA 

      Codocedo, Victor; Baixeries i Juvillà, Jaume; Kaytoue, Mehdi; Napoli, Amedeo (2016)
      Conference report
      Open Access
      Functional Dependencies (FDs) play a key role in many fields of the relational database model, one of the most widely used database systems. FDs have also been applied in data analysis, data quality, knowledge discovery ...
    • De menos a distinto: estudio de la implantación de R en las asignaturas del grado de estadística 

      Baixeries i Juvillà, Jaume; Fairén González, Marta; Gabarró Vallès, Joaquim; Pasarella Sánchez, Ana Edelmira (Universidad de Almería, 2016-07-05)
      Conference lecture
      Open Access
      Los cursos de informática en las titulaciones que no son informáticas siempre pecan de falta de motivación y buenos resultados de los estudiantes. El argumento del estudiante acostumbra a ser: ¿A mí para que me servirá ...
    • De Menos a Distinto: Estudio de la Implantación de R en las asignaturas del grado de estadística 

      Baixeries i Juvillà, Jaume; Fairén González, Marta; Gabarró Vallès, Joaquim; Pasarella Sánchez, Ana Edelmira (2016)
      Conference report
      Open Access
      Teaching computer science in degrees that are not computer science related presents an important challenge: to motivate the students and to achieve good average grades. The student’s complaint is always based ...
    • Frequent sets, sequences, and taxonomies: new, efficient algorithmic proposals 

      Baixeries i Juvillà, Jaume; Casas Garriga, Gemma; Balcázar Navarro, José Luis (2000-12)
      External research report
      Open Access
      We describe efficient algorithmic proposals to approach three fundamental problems in data mining: association rules, episodes in sequences, and generalized association rules over hierarchical taxonomies. The association ...
    • INFORMÀTICA. Control 1 (Curs 2019-2020) 

      Hernández Gómez, M. Angeles; Casas Fernández, Bernardino; Baixeries i Juvillà, Jaume; Román Jiménez, José Antonio (Universitat Politècnica de Catalunya, 2019-11-05)
      Exam
      Restricted access to the UPC academic community
    • INFORMÀTICA. Control 1. Curs 2018-2019 [Q1] 

      Román Jiménez, José Antonio; Merenciano Saladrigas, Josep Maria; Urmeneta Coletas, Jordi; Baixeries i Juvillà, Jaume; Ortiz Martínez, Daniel; Mata Miquel, Cristian (Universitat Politècnica de Catalunya, 2018-10-31)
      Exam
      Restricted access to the UPC academic community
    • INFORMÀTICA. Control 2 (Curs 2019-2020) 

      Hernández Gómez, M. Angeles; Román Jiménez, José Antonio; Casas Fernández, Bernardino; Baixeries i Juvillà, Jaume (Universitat Politècnica de Catalunya, 2020-01-09)
      Exam
      Restricted access to the UPC academic community
    • INFORMÀTICA. Control 2. Curs 2018-2019 [Q1] 

      Mata Miquel, Cristian; Ortiz Martínez, Daniel; Román Jiménez, José Antonio; Merenciano Saladrigas, Josep Maria; Urmeneta Coletas, Jordi; Baixeries i Juvillà, Jaume (Universitat Politècnica de Catalunya, 2019-01-14)
      Exam
      Restricted access to the UPC academic community
    • INFORMÀTICA. Reavaluació / Final extraordinari (Curs 2019-2020) 

      Hernández Gómez, M. Angeles; Casas Fernández, Bernardino; Baixeries i Juvillà, Jaume; Román Jiménez, José Antonio (Universitat Politècnica de Catalunya, 2020-01-24)
      Exam
      Restricted access to the UPC academic community