Listar Dpto. Ingeniería Matemática e Informática - Matematika eta Informatika Ingeniaritza Saila por título
Mostrando ítems 14-33 de 82
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Challenges in wireless system integration as enablers for indoor context aware environments
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 radio propagation channel in urban vehicle to infrastructure environments to support WSNs
Vehicular ad hoc Networks (VANETs) enable vehicles to communicate with each other as well as with roadside units (RSUs). Although there is a significant research effort in radio channel modelling focused in vehicle to ... -
Characterization of wireless channel impact on wireless sensor network performance in public transportation buses
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 ... -
Charge transfer in the Rydberg hydrogen atom metal surface interaction: a transition state approach
We study the classical dynamics of a hydrogen atom near a metallic surface in the presence of a uniform electric field. By continuation of families of periodic orbits and surfaces of section we show that, due to the electric ... -
A combined fractional step domain decomposition method for the numerical integration of parabolic problems
In this paper we develop parallel numerical algorithms to solve linear time dependent coefficient parabolic problems. Such methods are obtained by means of two consecutive discretization procedures. Firstly, we realize ... -
Construction of additive semi-implicit Runge-Kutta methods with low-storage requirements
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
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
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
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
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
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
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
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
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 ... -
Designing and implementing digital educational tools for children and youth with special needs using natural interfaces
Esta tesis se centra en el potencial pedagógico de Interfaces Naturales de Usuario (NUIs) y su aplicación en distintos ámbitos educativos. Las NUIs son interacciones remotas basadas en movimientos gestuales del cuerpo y ... -
Dynamics of axially symmetric perturbed Hamiltonians in 1:1:1 resonance
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 ... -
An easy to deploy street light control system based on wireless communication and LED technology
This paper presents an intelligent streetlight management system based on LED lamps, designed to facilitate its deployment in existing facilities. The proposed approach, which is based on wireless communication technologies, ... -
Educational games to enhance museum visits for schools
Museums usually look for new educational tools to enhance their exhibition. The Oteiza's museum in Navarre (Spain) especially gives importance to the dissemination of Jorge Oteiza's work to children at schools. Consequently, ... -
An efficient numerical method for singularly perturbed time dependent parabolic 2D convection-diffusion systems
In this paper we deal with solving efficiently 2D linear parabolic singularly perturbed systems of convection–diffusion type. We analyze only the case of a system of two equations where both of them feature the same diffusion ... -
Embedded pairs of fractional step Runge-Kutta methods and improved domain decomposition techniques for parabolic problems
In this paper we design and apply new embedded pairs of Frac- tional Step Runge-Kutta methods to the e±cient solution of multidimensional parabolic problems. These time integrators are combined with a suitable split- ting ...