Browsing Artículos de revista DIMI - MIIS Aldizkari artikuluak by Title
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Analysis of radio wave propagation for ISM 2.4 GHz wireless sensor networks in inhomogeneous vegetation environments
Azpilicueta Fernández de las Heras, Leyre
; López Iturri, Peio ; Aguirre Gallego, Erik ; Mateo Zozaya, Ignacio; Astrain Escola, José Javier ; Villadangos Alonso, Jesús ; Falcone Lanas, Francisco Javier (MDPI, 2014)
Artículo / Artikulua 
The use of wireless networks has experienced exponential growth due to the improvements in terms of battery life and low consumption of the devices. However, it is compulsory to conduct previous radio propagation analysis ... -
Analysis of wireless sensor network topology and estimation of optimal network deployment by deterministic radio channel characterization
Aguirre Gallego, Erik ; López Iturri, Peio ; Azpilicueta Fernández de las Heras, Leyre ; Astrain Escola, José Javier ; Villadangos Alonso, Jesús ; Falcone Lanas, Francisco Javier (MDPI, 2015)
Artículo / Artikulua
One of the main challenges in the implementation and design of context-aware scenarios is the adequate deployment strategy for Wireless Sensor Networks (WSNs), mainly due to the strong dependence of the radiofrequency ... -
Analytic formulas for the evaluation of the Pearcey integral
López García, José Luis ; Pagola Martínez, Pedro Jesús (American Mathematical Society, 2017)
Artículo / Artikulua
We can find in the literature several convergent and/or asymptotic expansions of the Pearcey integral P(x, y) in different regions of the complex variables x and y, but they do not cover the whole complex x and y ... -
Asymptotic and convergent expansions for solutions of third-order linear differential equations with a large parameter
Ferreira González, Chelo; López García, José Luis ; Pérez Sinusía, Ester (Shanghai Normal UniversityWilmington Scientific Publisher, 2018)
Artículo / Artikulua
In previous papers [6–8,10], we derived convergent and asymptotic expansions of solutions of second order linear differential equations with a large parameter. In those papers we generalized and developed special cases not ... -
Asymptotic behaviour of the Urbanik semigroup
Berg, Christian; López García, José Luis (Elsevier, 2015)
Artículo / Artikulua
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 ... -
The asymptotic expansion of the swallowtail integral in the highly oscillatory region
Ferreira González, Chelo; López García, José Luis ; Pérez Sinusía, Ester (Elsevier, 2018)
Artículo / Artikulua
The mathematical models of many short wavelength phenomena, specially wave propagation and optical diffraction, contain, as a basic ingredient, oscillatory integrals with several nearly coincident stationary phase or ... -
Avoiding the order reduction when solving second-order in time PDEs with Fractional Step Runge–Kutta–Nyström methods
Moreta, M. Jesús; Bujanda Cirauqui, Blanca ; Jorge Ulecia, Juan Carlos (Elsevier, 2016)
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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. ... -
Basketball player on-body biophysical and environmental parameter monitoring based on wireless sensor network integration
Picallo Guembe, Imanol ; López iturri, Peio ; Astrain Escola, José Javier ; Aguirre Gallego, Erik ; Azpilicueta Fernández de las Heras, Leyre; Celaya-Echarri, Mikel; Villadangos Alonso, Jesús ; Falcone Lanas, Francisco (IEEE, 2021)
Artículo / Artikulua
Sport activities have benefited in recent years from the progressive adoption of different technological assets in order to improve individual as well as group training, collect different statistics or enhance the spectator ... -
Challenges in wireless system integration as enablers for indoor context aware environments
López Iturri, Peio ; Aguirre Gallego, Erik ; Azpilicueta Fernández de las Heras, Leyre ; Astrain Escola, José Javier ; Villadangos Alonso, Jesús ; Falcone Lanas, Francisco Javier (MDPI, 2017)
Artículo / Artikulua
The advent of fully interactive environments within Smart Cities and Smart Regions requires the use of multiple wireless systems. In the case of user-device interaction, which finds multiple applications such as Ambient ... -
Characterization of wireless channel impact on wireless sensor network performance in public transportation buses
Azpilicueta Fernández de las Heras, Leyre ; López Iturri, Peio ; Aguirre Gallego, Erik ; Astrain Escola, José Javier ; Villadangos Alonso, Jesús ; Zubiri Segura, Cristóbal; Falcone Lanas, Francisco Javier (IEEE, 2015)
Artículo / Artikulua
Wireless communications systems are growing rapidly during the last two decades and they are gaining a significant role for multiple communication tasks within public transportation buses. In this work, the impact of ... -
Construction of additive semi-implicit Runge-Kutta methods with low-storage requirements
Higueras Sanz, Inmaculada ; Roldán Marrodán, Teodoro (Springer US, 2016)
Artículo / Artikulua
Space discretization of some time-dependent partial differential equations gives rise to systems of ordinary differential equations in additive form whose terms have different stiffness properties. In these cases, implicit ... -
Convergent and asymptotic expansions of solutions of differential equations with a large parameter: Olver cases II and III
Ferreira González, Chelo; López García, José Luis ; Pérez Sinusía, Ester (Rocky Mountain Mathematics Consortium, 2015)
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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) ... -
Convergent and asymptotic expansions of the Pearcey integral
López García, José Luis ; Pagola Martínez, Pedro Jesús (Elsevier, 2015)
Artículo / Artikulua
We consider the Pearcey integral P(x; y) for large values of |x|, x, y ∈ C. We can find in the literature several convergent or asymptotic expansions in terms of elementary and special functions, with different levels ... -
Convergent and asymptotic methods for second-order difference equations with a large parameter
Ferreira González, Chelo; López García, José Luis ; Pérez Sinusía, Ester (Springer, 2018)
Artículo / Artikulua
We consider the second-order linear difference equation y(n+2)−2ay(n+1)−Λ2y(n)=g(n)y(n)+f(n)y(n+1) , where Λ is a large complex parameter, a≥0 and g and f are sequences of complex numbers. Two methods are proposed to find ... -
Convergent asymptotic expansions of Charlier, Laguerre and Jacobi polynomials
López García, José Luis ; Temme, Nico M. (Cambridge University Press, 2004)
Artículo / Artikulua
Convergent expansions are derived for three types of orthogonal polynomials: Charlier, Laguerre and Jacobi. The expansions have asymptotic properties for large values of the degree. The expansions are given in terms of ... -
Convergent expansions of the Bessel functions in terms of elementary functions
López García, José Luis ; Pagola Martínez, Pedro Jesús (Springer US, 2018)
Artículo / Artikulua
We consider the Bessel functions Jν (z) and Yν (z) for ν > −1/2 and z ≥ 0. We derive a convergent expansion of Jν (z) in terms of the derivatives of (sin z)/z, and a convergent expansion of Yν (z) in terms of derivatives ... -
Convergent expansions of the incomplete gamma functions in terms of elementary functions
Bujanda Cirauqui, Blanca ; López García, José Luis ; Pagola Martínez, Pedro Jesús (World Scientific Publishing, 2017)
Artículo / Artikulua
We consider the incomplete gamma function γ(a,z) for Ra>0 and z∈C. We derive several convergent expansions of z−aγ(a,z) in terms of exponentials and rational functions of z that hold uniformly in z with Rz bounded from ... -
Decoupling mixed finite elements on hierarchical triangular grids for parabolic problems
Arrarás Ventura, Andrés ; Portero Egea, Laura (Elsevier, 2018)
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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 ... -
Design and performance analysis of wireless body area networks in complex indoor e-Health hospital environments for patient remote monitoring
Aguirre Gallego, Erik ; López Iturri, Peio ; Azpilicueta Fernández de las Heras, Leyre ; Rivarés Garasa, Carmen; Astrain Escola, José Javier ; Villadangos Alonso, Jesús ; Falcone Lanas, Francisco Javier (SAGE, 2016)
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In this article, the design and performance analysis of wireless body area network–based systems for the transmission of medical information readable in an android-based application deployed within complex indoor e-Health ... -
Dynamics of axially symmetric perturbed Hamiltonians in 1:1:1 resonance
Carrasco, Dante; Palacián Subiela, Jesús Francisco ; Vidal Díaz, Claudio; Vidarte, Jhon; Yanguas Sayas, Patricia (Springer, 2018)
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We study the dynamics of a family of perturbed three-degree-of-freedom Hamiltonian systems which are in 1:1:1 resonance. The perturbation consists of axially symmetric cubic and quartic arbitrary polynomials. Our analysis ...
