Browsing Departament: Matemàtiques by Title

Now showing items 349-368 of 820

    • openAccess   h-plots for displaying nonmetric dissimilarity matrices 

      Epifanio, Irene Wiley Periodicals (2013-01)
      Nonmetric pairwise data with violations of symmetry, reflexivity, or triangle inequality appear in fields such as image matching, web mining, or cognitive psychology. When data are inherently nonmetric, we should not enforce ...

    • openAccess   H5P: crear, compartir, evaluar, reutilizar, etc. 

      Pacheco Aparicio, Julio Instituto Nacional de Tecnologías Educativas y de Formación del Profesorado (INTEF) (2022-06-28)
      Desde la introducción de las tecnologías de información y comunicaciones en el aula, una de las preocupaciones de la docencia era encontrar entornos para la creación, realización y evaluación de actividades educativas. Eso ...

    • closedAccess   Has the balloon really burst? Analysis of “the UK-REBOA randomized clinical trial” 

      Martínez Hernández, Andreu; Chorro, Rosanna; Climent, Andrés; Lazaro-Paulina, Francisco G.; Martínez García, Vicente Elsevier (2024-08)
      Background: Uncontrolled hemorrhagic shock is a leading cause of early death after injury. Resuscitative endovascular balloon occlusion of the aorta (REBOA) represents a paradigm shift in achieving hemodynamic stability ...

    • closedAccess   Heteroskedastic geographically weighted regression model for functional data 

      Romano, Elvira; Mateu, Jorge; Butzbach, O. Elsevier (2020)
      A large number of approaches for modelling spatially dependent functional variables often assume that the functional regression coefficients are constant over the region of interest. However, in many occasions it is far ...

    • openAccess   Hierarchical spatial modeling of the presence of Chagas disease insect vectors in Argentina. A comparative approach 

      Juan, Pablo; Díaz-Avalos, Carlos; Mejía-Domínguez, Nancy R.; Mateu, Jorge Springer Verlag (2016)
      We modeled the spatial distribution of the most important Chagas disease vectors in Argentina, in order to obtain a predictive mapping method for the probability of presence of the vector species. We analyzed both the ...

    • openAccess   Hierarchical Spatio-Temporal Change-Point Detection 

      Moradi, Mehdi; Cronie, Ottmar; Pérez-Goya, Unai; Mateu, Jorge Taylor and Francis (2023)
      1 Introduction 2 Multivariate Change-Point Detection 3 Hierarchical Spatio-Temporal Change-Point Detection 4 Numerical Evaluation 5 Real Data Analyses 6 Discussion Supplemental material Acknowledgements References ...

    • openAccess   High leverage detection in general functional regression models with spatially correlated errors 

      Romano, Elvira; Giraldo, Ramón; Mateu, Jorge; Diana, Andrea Wiley (2021)
      The presence of curves that deviate markedly from the core of a set of curves can greatly affect inference and forecasting in a functional regression model. Thus their detection is key to increase the accuracy of the ...

    • openAccess   High order integrators obtained by linear combinations of symmetric-conjugate compositions 

      Casas, Fernando; Escorihuela-Tomàs, Alejandro Elsevier (2022-02-01)
      A new family of methods involving complex coefficients for the numerical integration of differential equations is presented and analyzed. They are constructed as linear combinations of symmetric-conjugate compositions ...

    • openAccess   High precision Symplectic Integrators for the Solar System 

      Farrés Basiana, Ariadna; Laskar, Jacques; Blanes, Sergio; Casas, Fernando; Makazaga, Joseba; Murua, Ander Springer Netherlands (2013-02)
      Using a Newtonian model of the Solar System with all 8 planets, we perform extensive tests on various symplectic integrators of high orders, searching for the best splitting scheme for long term studies in the Solar System. ...

    • openAccess   High-order commutator-free quasi-Magnus exponential integrators for non-autonomous linear evolution equation 

      Blanes, Sergio; Casas, Fernando; Thalhammer, Mechthild Elsevier (2017-11)
      The class of commutator-free quasi-Magnus (CFQM) exponential integrators provides a favourable alternative to standard Magnus integrators, in particular for large-scale applications arising in the time integration of ...

    • openAccess   High-order Hamiltonian splitting for the Vlasov–Poisson equations 

      Casas, Fernando; Crouseilles, Nicolas; Faou, Erwan; Mehrenberger, Michel Springer Verlag (2017)
      We consider the Vlasov–Poisson equation in a Hamiltonian framework and derive new time splitting methods based on the decomposition of the Hamiltonian functional between the kinetic and electric energy. Assuming smoothness ...

    • openAccess   Highly tempering infinite matrices 

      Bernal González, Luis; Conejero, J. Alberto; murillo arcila, marina; Seoane Sepúlveda, Juan Springer Milan (2017-02)
      In this short note, it is proved the existence of in nite matrices that not only preserve convergence and limits of sequences but also convert every mem- ber of some dense vector space consisting, except for zero, of ...

    • openAccess   Hilbert regularity of Z-graded modules over polynomial rings 

      Bruns, Winfried; Moyano-Fernández, Julio José; Uliczka, Jan Rocky Mountain Mathematics Consortium (2017-06)
      Let M be a finitely generated Z-graded module over the standard graded polynomial ring R=K[X1,…,Xd] with K a field, and let HM(t)=QM(t)/(1−t)d be the Hilbert series of~M. We introduce the Hilbert regularity of~M as the ...

    • openAccess   Hilbert series of modules over positively graded polynomial rings 

      Katthan, Lukas; Moyano-Fernández, Julio José; Uliczka, Jan Elsevier (2016-08)
      In this note, we give examples of formal power series satisfying certain conditions that cannot be realized as Hilbert series of finitely generated modules. This answers to the negative a question raised in a recent article ...

    • openAccess   Hippocampal shape analysis in Alzheimer’s disease using Functional Data Analysis 

      Epifanio, Irene; Ventura Campos, Mercedes Wiley-Blackwell (2013)
      The hippocampus is one of the first affected regions in Alzheimer's disease. The left hippocampi of control subjects, patients with mild cognitive impairment and patients with Alzheimer's disease are represented by spherical ...

    • openAccess   Homogenization in compiling ICRF combined catalogs 

      Marco Castillo, Francisco José; Martínez Usó, María José; López Ortí, José Antonio EDP Sciences (2013)
      Context. The International Astronomical Union (IAU) recommendations regarding the International Celestial Reference Frame (ICRF) realizations require the construction of radio sources catalogs obtained using very-long-baseline ...

    • openAccess   Homomorphic encoders of profinite abelian groups I 

      Ferrer, María V.; Hernández, Salvador Elsevier (2023-05)
      Let {Gi |i ∈ N} be a family of finite Abelian groups. We say that a subgroup G ≤ i∈N Gi is order controllable if for every i ∈ N there is ni ∈ N such that for each c ∈ G, there exists a ∈ G satisfying that a|[1,i] = ...

    • openAccess   Homomorphic Encoders of Profinite Abelian Groups II 

      Ferrer, María V.; Hernández, Salvador MDPI (2022-03-29)
      Let {Gi:i∈N} be a family of finite Abelian groups. We say that a subgroup G≤∏i∈NGi is order controllable if for every i∈N, there is ni∈N such that for each c∈G, there exists c1∈G satisfying c1|[1,i]=c|[1,i], supp(c1)⊆[1,ni], ...

    • openAccess   How to compute the Stanley depth of a module 

      Ichim, Bogdan; Katthan, Lukas; Moyano-Fernández, Julio José American Mathematical Society (2017)
      In this paper we introduce an algorithm for computing the Stanleydepth of a finitely generated multigraded module M over the polynomialring K[X1,...,Xn]. As an application, we give an example of a module whoseStanley depth ...

    • openAccess   Hölder regularity for the Moore-Gibson-Thompson equation with infinite delay 

      Abadias, Luciano; Lizama, Carlos; murillo arcila, marina American Institute of Mathematical Sciences (AIMS) (2018-01)
      We characterize the well-posedness of a third order in time equation with infinite delay in Holder spaces, solely in terms of spectral properties concerning the data of the problem. Our analysis includes the case of the ...