Recent Submissions

  • Radio wave propagation and WSN deployment in complex utility tunnel environments 

    Celaya Echarri, Mikel; Azpilicueta Fernández de las Heras, Leyre Upna Orcid; López Iturri, Peio Upna Orcid; Picallo Guembe, Imanol Upna Orcid; Aguirre Gallego, Erik Upna Orcid; Astrain Escola, José Javier Upna Orcid; Villadangos Alonso, Jesús Upna Orcid; Falcone Lanas, Francisco Javier Upna Orcid (MDPI, 2020)   Artículo / Artikulua  OpenAccess
    The significant growth of wireless communications systems in the last years has led to the adoption of a wide range of applications not only for the general public but, also, including utilities and administrative authorities. ...
  • Redes de brainstorming y formación de equipos innovadores apoyado por herramientas Web 2.0 

    Ardaiz Villanueva, Óscar Upna Orcid; Nicuesa, Xabier; Brene Artázcoz, Óscar; Sanz de Acedo Lizarraga, María Luisa Upna; Sanz de Acedo Baquedano, María Teresa Upna (Asociación Interacción Persona-Ordenador, 2009)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    Esta investigación tiene como finalidad ofrecer una nueva forma de realización de la técnica brainstorming apoyada en herramientas informáticas Web2.0 para mejorar los procesos innovadores. Estas herramientas permiten la ...
  • On the modeling of the concept: “The Contents of the Empty Set" using the activity orderings family (⊑w)w∈L in a distributive lattice ( L, ≤ ). An interpretation of those order relations ⊑w as alternative inclusions (“w-Inclusions") and of its associated inf- operators ⨅w as additional intersections (“w-Intersections”), both in the Intuitive set theory and in the L-fuzzy set theory. (In Spanish) 

    Fuentes González, Ramón Upna Orcid (2018)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    A mathematical model is presented to define new inclusions, intersections and unions as alternatives to the usual ones between crisp and fuzzy subsets. In particular, the concept of “the non-trivial content of the empty ...
  • Decoupling mixed finite elements on hierarchical triangular grids for parabolic problems 

    Arrarás Ventura, Andrés Upna Orcid; Portero Egea, Laura Upna Orcid (Elsevier, 2018)   Artículo / Artikulua  OpenAccess
    In this paper, we propose a numerical method for the solution of time-dependent flow problems in mixed form. Such problems can be efficiently approximated on hierarchical grids, obtained from an unstructured coarse ...
  • Optimal monotonicity-preserving perturbations of a given Runge–Kutta method 

    Higueras Sanz, Inmaculada Upna Orcid; Ketcheson, David I.; Kocsis, Tihamér A. (Springer, 2018)   Artículo / Artikulua  OpenAccess
    Perturbed Runge–Kutta methods (also referred to as downwind Runge–Kutta methods) can guarantee monotonicity preservation under larger step sizes relative to their traditional Runge–Kutta counterparts. In this paper we study ...
  • Convergent and asymptotic expansions of solutions of differential equations with a large parameter: Olver cases II and III 

    Ferreira González, Chelo Upna; López García, José Luis Upna Orcid; Pérez Sinusía, Ester Upna Orcid (Rocky Mountain Mathematics Consortium, 2015)   Artículo / Artikulua  OpenAccess
    This paper continues the investigation initiated in [Lopez, 2013]. We consider the asymptotic method designed by F. Olver [Olver, 1974] for linear differential equations of the second order containing a large (asymptotic) ...
  • Representations of hypergeometric functions for arbitrary parameter values and their use 

    Karp, D. B.; López García, José Luis Upna Orcid (2017)   Artículo / Artikulua  OpenAccess
    Integral representations of hypergeometric functions proved to be a very useful tool for studying their properties. The purpose of this paper is twofold. First, we extend the known representations to arbitrary values of ...
  • Asymptotic behaviour of the Urbanik semigroup 

    Berg, Christian; López García, José Luis Upna Orcid (Elsevier, 2015)   Artículo / Artikulua  OpenAccess
    We revisit the product convolution semigroup of probability densities ec(t); c > 0 on the positive half-line with moments (n!)c and determine the asymptotic behaviour of ec for large and small t > 0. This shows that (n!)c ...
  • New series expansions of the 3F2 function 

    López García, José Luis Upna Orcid; Pagola Martínez, Pedro Jesús Upna; Pérez Sinusía, Ester Upna Orcid (2015)   Artículo / Artikulua  OpenAccess
    We can use the power series definition of 3F2(a1, a2, a3; b1, b2; z) to compute this function for z in the unit disk only. In this paper we obtain new expansions of this function that are convergent in larger domains. ...
  • From start to finish: teenagers on the autism spectrum developing their own collaborative game 

    Bossavit, Benoît Upna Orcid; Parsons, Sarah (Emerald, 2017)   Artículo / Artikulua  OpenAccess
    Purpose: The purpose of this paper is to investigate how teenagers on the autism spectrum respond to their involvement in the creation of a collaborative game, meeting the curriculum requirements in programming at secondary ...
  • Modified Douglas splitting methods for reaction–diffusion equations 

    Arrarás Ventura, Andrés Upna Orcid; Hout, K. J. in ’t; Hundsdorfer, W.; Portero Egea, Laura Upna Orcid (Springer, 2017)   Artículo / Artikulua  OpenAccess
    We present modifications of the second-order Douglas stabilizing corrections method, which is a splitting method based on the implicit trapezoidal rule. Inclusion of an explicit term in a forward Euler way is straightforward, ...
  • Orthogonal basis for the optical transfer function 

    Ferreira González, Chelo Upna; López García, José Luis Upna Orcid; Navarro, Rafael; Pérez Sinusía, Ester Upna Orcid (Optical Society of America, 2016)   Artículo / Artikulua  OpenAccess
    We propose systems of orthogonal functions qn to represent optical transfer functions (OTF) characterized by including the diffraction-limited OTF as the first basis function q0 OTF perfect. To this end, we apply a powerful ...
  • Orthogonal basis with a conicoid first mode for shape specification of optical surfaces: reply 

    Ferreira González, Chelo Upna; López García, José Luis Upna Orcid; Navarro, Rafael; Pérez Sinusía, Ester Upna Orcid (Optical Society of America, 2016)   Artículo / Artikulua  OpenAccess
    We present some comments to the paper 'Orthogonal basis with a conicoid first mode for shape specification of optical surfaces: comment'.
  • Avoiding the order reduction when solving second-order in time PDEs with Fractional Step Runge–Kutta–Nyström methods 

    Moreta, M. Jesús; Bujanda Cirauqui, Blanca Upna Orcid; Jorge Ulecia, Juan Carlos Upna Orcid (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
    We study some of the main features of Fractional Step Runge–Kutta–Nyström methods when they are used to integrate Initial–Boundary Value Problems of second order in time, in combination with a suitable spatial discretization. ...
  • High order Nyström methods for transmission problems for Helmholtz equation 

    Domínguez Baguena, Víctor Upna Orcid; Turc, Catalin (Springer, 2016)   Capítulo de libro / Liburuen kapitulua  OpenAccess
    We present super-algebraic compatible Nyström discretizations for the four Helmholtz boundary operators of Calderón’s calculus on smooth closed curves in 2D. These discretizations are based on appropriate splitting of the ...
  • Scalability approaches for causal multicast: a survey 

    Juan Marín, Rubén de; Decker, Hendrik; Armendáriz Íñigo, José Enrique Upna Orcid; Bernabéu Aubán, José M.; Muñoz Escoí, Francesc D. (Springer, 2016)   Artículo / Artikulua  OpenAccess
    Many distributed services need to be scalable: internet search, electronic commerce, e-government... In order to achieve scalability those applications rely on replicated components. Because of the dynamics of growth and ...
  • A fully discrete Calderón calculus for the two-dimensional elastic wave equation 

    Domínguez Baguena, Víctor Upna Orcid; Sánchez Vizuet, Tonatiuh; Sayas, Francisco Javier (Elsevier, 2015)   Artículo / Artikulua  OpenAccess
    In this paper we present a full discretization of the layer potentials and boundary integral operators for the elastic wave equation on a parametrizable smooth closed curve in the plane. The method can be understood as a ...
  • Improved accuracy for time-splitting methods for the numerical solution of parabolic equations 

    Arrarás Ventura, Andrés Upna Orcid; Portero Egea, Laura Upna Orcid (Elsevier, 2015)   Artículo / Artikulua  OpenAccess
    In this work, we study time-splitting strategies for the numerical approximation of evolutionary reaction–diffusion problems. In particular, we formulate a family of domain decomposition splitting methods that overcomes ...
  • Eventual consistency: origin and support 

    Muñoz Escoí, Francesc D.; García Escrivá, José Ramón; Sendra Roig, Juan Salvador; Bernabéu Aubán, José M.; González de Mendívil Moreno, José Ramón Upna Orcid (Slovak Academy of Sciences, Institute of Informatics, 2018)   Artículo / Artikulua  OpenAccess
    Eventual consistency is demanded nowadays in geo-replicated services that need to be highly scalable and available. According to the CAP constraints, when network partitions may arise, a distributed service should choose ...
  • Order barrier for low-storage DIRK methods with positive weights 

    Higueras Sanz, Inmaculada Upna Orcid; Roldán Marrodán, Teodoro Upna Orcid (Springer, 2018)   Artículo / Artikulua  OpenAccess
    In this paper we study an order barrier for low-storage diagonally implicit Runge-Kutta (DIRK) methods with positive weights. The Butcher matrix for these schemes, that can be implemented with only two memory registers in ...

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