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Browsing by Subject "Computational costs"

Now showing items 1-12 of 12

A conceptual numerical model to simulate hydraulic head in aquifers that are hydraulically connected to surface water bodies

Pulido Velázquez, David; Sahuquillo Herráiz, Andrés; Andreu Álvarez, Joaquín (Wiley: 12 months, 2011-07)

In this paper, we present a conceptual-numerical model that can be deduced from a calibrated finite difference groundwater-flow model, which provides a parsimonious approach to simulate and analyze hydraulic heads and ...
A piecewise-linearized algorithm based on the Krylov subspace for solving stiff ODEs

Ibáñez González, Jacinto Javier; Hernández García, Vicente; Ruiz Martínez, Pedro Antonio; Arias, Enrique (Elsevier, 2011-02)

Numerical methods for solving Ordinary Differential Equations (ODEs) have received considerable attention in recent years. In this paper a piecewise-linearized algorithm based on Krylov subspaces for solving Initial Value ...
An affine projection algorithm with variable step-size and projection order

Gonzalez, Alberto; Ferrer Contreras, Miguel; Diego Antón, María de; Piñero Sipán, María Gemma (Elsevier, 2012-07)

It is known that the performance of adaptive algorithms is constrained by their computational cost. Thus, affine projection adaptive algorithms achieve higher convergence speed when the projection order increases, which ...
Fast exact variable order affine projection algorithm

Ferrer Contreras, Miguel; Gonzalez, Alberto; Diego Antón, María de; Piñero Sipán, María Gemma (Elsevier, 2012-09)

Variable order affine projection algorithms have been recently presented to be used when not only the convergence speed of the algorithm has to be adjusted but also its computational cost and its final residual error. These ...
Modeling and comparison of candidate selection algorithms in opportunistic routing

Darehshoorzadeh, A.; Cerdà-Alabern, L.; Pla, Vicent (Elsevier, 2011-09-15)

Opportunistic Routing (OR) has been investigated in recent years as a way to increase the performance of multihop wireless networks by exploiting its broadcast nature. In contrast to traditional routing, where traffic is ...
New efficient numerical methods to describe the heat transfer in a solid medium

Ponsoda Miralles, Enrique; Blanes Zamora, Sergio; Bader, Philipp (Elsevier, 2011-10)

The analysis of heat conduction through a solid with heat generation leads to a linear matrix differential equation with separated boundary conditions. We present a symmetric second order exponential integrator for the ...
Polynomial approximation of nonlinear differential systems with prefixed accuracy

Chen Charpentier, Benito Miguel; Jódar Sánchez, Lucas Antonio; Telyakovskiy, Aleksey S. (Elsevier, 2011-11-01)

This paper presents a method for constructing polynomial approximations of the solutions of nonlinear initial value systems of differential equations. Given an a priori chosen accuracy, the degree of the vector polynomial ...
Slenderness limit of the weak axis in the design of rectangular reinforced concrete non-sway columns

Cortés Moreno, Eduardo; Bonet Senach, José Luís; Romero, Manuel L.; Miguel Sosa, Pedro (Elsevier, 2011-02-03)

Most design codes (Model Code 90, ACI-318-2008 and Eurocode-2-2004) suggest that the effect of a geometrical imperfection ought to be taken into account in the most unfavorable direction when designing slender reinforced ...
Three-step iterative methods with optimal eighth-order convergence

Cordero Barbero, Alicia; Torregrosa Sánchez, Juan Ramón; Penkova Vassileva, María (Elsevier, 2011-03-15)

In this paper, based on Ostrowski's method, a new family of eighth-order methods for solving nonlinear equations is derived. In terms of computational cost, each iteration of these methods requires three evaluations of the ...
Two secure and energy-saving spontaneous ad-hoc protocol for wireless mesh client networks

Lacuesta Gilaberte, Raquel; Lloret, Jaime; García Pineda, Miguel; Peñalver Herrero, Mª Lourdes (Elsevier, 2011-03)

We can find many cases where a spontaneous wireless ad-hoc network must be built for a limited period of time in a wireless mesh network: meetings, conferences, etc. One of the main aspects in a spontaneous network is to ...
Using finite mixture models in thermal-hydraulics system code uncertainty analysis

Carlos Alberola, Sofía; Sánchez Galdón, Ana Isabel; Ginestar Peiro, Damián; Martorell Alsina, Sebastián Salvador (Elsevier, 2013-09)

Nuclear Power Plant safety analysis is mainly based on the use of best estimate (BE) codes that predict the plant behavior under normal or accidental conditions. As the BE codes introduce uncertainties due to uncertainty ...
Using the GSVD and the lifting technique to find {P; k+ 1} reflexive and anti-reflexive solutions of AXB = C

Herrero Debón, Alicia; Thome, Néstor (Elsevier, 2011-07)

The generalized singular value decomposition (GSVD) and the lifting technique combined with the Kronecker product are exploited to find reflexive and anti-reflexive (with respect to a generalized k+1-reflection matrix P) ...