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Listar por autor "Frau García, María Dolores"
Mostrando ítems 21-40 de 44
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Artículo
Embedding cocylic D-optimal designs in cocylic Hadamard matrices
Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Frau García, María Dolores; Gudiel Rodríguez, Félix (International Linear Algebra Society, 2012)A method for embedding cocyclic submatrices with “large” determinants of orders 2t in certain cocyclic Hadamard matrices ...
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Ponencia
Error correcting codes from quasi-Hadamard matrices
Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Frau García, María Dolores; Martín García, Elena; Osuna Lucena, Amparo (Springer, 2007)Levenshtein described in [5] a method for constructing error correcting codes which meet the Plotkin bounds, provided ...
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Artículo
GA Based Robust Blind Digital Watermarking
Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Frau García, María Dolores; Gudiel Rodríguez, Félix; Güemes Alzaga, María Belén; Martín García, Elena; Osuna Lucena, Amparo (Elsevier, 2018)A genetic algorithm based robust blind digital watermarking scheme is presented. The experimental results show that our ...
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Artículo
Generating binary partial Hadamard matrices
Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Falcón Ganfornina, Raúl Manuel; Frau García, María Dolores; Gudiel Rodríguez, Félix; Güemes Alzaga, María Belén; Osuna Lucena, Amparo (Elsevier, 2019)This paper deals with partial binary Hadamard matrices. Although there is a fast simple way to generate about a half ...
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Ponencia
Generating partial Hadamard matrices as solutions to a Constraint Satisfaction Problem characterizing cliques
Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Falcón Ganfornina, Raúl Manuel; Frau García, María Dolores; Gudiel Rodríguez, Félix; Güemes Alzaga, María Belén; Osuna Lucena, Amparo (2017-07)A procedure is described looking for partial Hadamard matrices, as cliques of a particular subgraph Gt of Ito’s Hadamard ...
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Ponencia
Gröbner bases and cocyclic Hadamard matrices
Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Falcón Ganfornina, Raúl Manuel; Frau García, María Dolores; Gudiel Rodríguez, Félix (2017-07) -
Artículo
Gröbner bases and cocyclic Hadamard matrices
Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Falcón Ganfornina, Raúl Manuel; Frau García, María Dolores; Gudiel Rodríguez, Félix (Elsevier, 2018)Hadamard ideals were introduced in 2006 as a set of nonlin-ear polynomial equations whose zeros are uniquely related ...
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Artículo
Hadamard Matrices with Cocyclic Core
Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Frau García, María Dolores; Gudiel Rodríguez, Félix; Güemes Alzaga, María Belén; Osuna Lucena, Amparo (MDPI, 2021)Since Horadam and de Launey introduced the cocyclic framework on combinatorial designs in the 1990s, it has revealed ...
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Artículo
Homological models for semidirect products of finitely generated Abelian groups
Álvarez Solano, Víctor; Frau García, María Dolores; Real Jurado, Pedro; Armario Sampalo, José Andrés (2012)Let G be a semidirect product of finitely generated Abelian groups. We provide a method for constructing an explicit ...
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Ponencia
Matrices cocíclicas de Hadamard sobre productos semidirectos
Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Frau García, María Dolores; Real Jurado, Pedro (Alberto Márquez, 2002) -
Ponencia
Un nuevo esquema de autenticación gráfica basado en cuadrados latinos
Falcón Ganfornina, Raúl Manuel; Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Frau García, María Dolores; González Regadera, Manuel; Gudiel Rodríguez, Félix; Güemes Alzaga, María Belén (Universidad de Sevilla. Escuela Técnica Superior de Ingeniería Informática, 2024)En contraposición a las contraseñas alfanuméricas, los esquemas de autenticación gráfica presentan un entorno amigable más ...
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Artículo
On Cocyclic Hadamard Matrices over Goethals-Seidel Loops
Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Falcón Ganfornina, Raúl Manuel; Frau García, María Dolores; Gudiel Rodríguez, Félix; Güemes Alzaga, María Belén; Osuna Lucena, Amparo (MDPI, 2020)About twenty-five years ago, Horadam and de Launey introduced the cocyclic development of designs, from which the notion ...
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Artículo
On D4t-Cocyclic Hadamard Matrices
Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Frau García, María Dolores; Gudiel Rodríguez, Félix; Güemes Alzaga, María Belén; Osuna Lucena, Amparo (Wiley, 2016)In this paper, we describe some necessary and sufficient conditions for a set of coboundaries to yield a cocyclic Hadamard ...
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Artículo
On higher dimensional cocyclic Hadamard matrices
Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Frau García, María Dolores; Real Jurado, Pedro (2015)Provided that a cohomological model for G is known, we describe a method for constructing a basis for n-cocycles over G, ...
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Artículo
On Skew E–W Matrices
Armario Sampalo, José Andrés; Frau García, María Dolores (Wiley, 2016)An E–W matrix M is a ( − 1, 1)-matrix of order urn:x-wiley:10638539:media:jcd21519:jcd21519-math-0001, where t is a positive ...
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Ponencia
El Proyecto CHATA
Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Frau García, María Dolores; González Díaz, Rocío; Jiménez Rodríguez, María José; Real Jurado, Pedro; Silva Gallardo, Beatriz (Universidad de Sevilla, 2001)En este art´ıculo, se pretende dar una visi´on general y lo m´as divulgativa posible sobre los prop´ositos y objetivos ...
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Ponencia
(Pseudo)-cocyclic (structured) Hadamard matrices over (quasi)groups
Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Falcón Ganfornina, Raúl Manuel; Frau García, María Dolores; Gudiel Rodríguez, Félix; Güemes Alzaga, María Belén; Kotsireas, Ilias (2017)Progressing on a survey of the state of the art of cocyclic constructions for Hadamard matrices, we will prove that the ...
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Artículo
Pseudococyclic Partial Hadamard Matrices over Latin Rectangles
Falcón Ganfornina, Raúl Manuel; Álvarez, Víctor; Frau García, María Dolores; Gudiel Rodríguez, Félix; Güemes Alzaga, María Belén (MDPI [Commercial Publisher], 2021-01-06)The classical design of cocyclic Hadamard matrices has recently been generalized by means of both the notions of the cocycle ...
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Ponencia
Rooted Trees Searching for Cocyclic Hadamard Matrices over D4t
Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Frau García, María Dolores; Gudiel Rodríguez, Félix; Osuna Lucena, Amparo (Springer, 2009)A new reduction on the size of the search space for cocyclic Hadamard matrices over dihedral groups D4t is described, in ...
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Ponencia
Searching for partial Hadamard matrices
Álvarez Solano, Víctor; Armario Sampalo, José Andrés; Frau García, María Dolores; Gudiel Rodríguez, Félix; Güemes Alzaga, María Belén; Martín García, Elena; Osuna Lucena, Amparo (Universidade de Santiago de Compostela, Servicio de Publicaciones, 2010)Three algorithms looking for pretty large partial Hadamard ma- trices are described. Here “large” means that hopefully ...