Publications

Displaying 776 - 800 of 1227

Publication	Date
Simulation of borehole-eccentered triaxial induction measurements using a Fourier hp finite-element method Authors: Myung Jin Nam,Carlos Torres-Verdín,David Pardo We developed a numerical method for accurate simulation of triaxial induction measurements in the presence of borehole-eccentered logging instruments. This 3D simulation method combines a Fourier series expansion in a new system of coordinates with a 2D, goal-oriented, high-order, and self-… Society of Exploration Geophysicists	2013-01-01
Multidimensional k-Interaction Classifier: Taking Advantage of All the Information Contained in Low Order Interactions Authors: Jose A. Lozano,Iñaki Inza,Aritz Pérez Martínes This work presents a multidimensional classifier described in terms of interaction factors called multidimensional k-interaction classifier. The classifier is based on a probabilistic model composed of the product of all the interaction factors of order lower or equal to k and it takes advantage of… Springer Berlin Heidelberg	2013-01-01
Inversion of Magnetotelluric Measurements Using Multigoal Oriented hp-adaptivity Authors: Julen Álvarez-Aramberri,Hélène Barucq,Hélène Barucq,David Pardo,David Pardo International audience; The inversion of magnetotelluric measurements require the computation of the quantity of interest (solution at the receivers) at different positions. Using a multigoal-oriented adaptive strategy for an hp Finite Element algorithm, we ensure accurate solutions in all… Elsevier BV	2013-01-01
Learning from Crowds in Multi-dimensional Classification Domains Authors: Jerónimo Hernández-González,Iñaki Inza,Jose A. Lozano Learning from crowds is a recently fashioned supervised classification framework where the true/real labels of the training instances are not available. However, each instance is provided with a set of noisy class labels, each indicating the class-membership of the instance according to the… Springer Berlin Heidelberg	2013-01-01
High-accuracy Adaptive Simulations of a Petri Dish Exposed to Electromagnetic Radiation Authors: Luis E. Garcia-Castillo,David Pardo,David Pardo,Ignacio Gomez-Revuelto This paper analyses numerically the electric field distribution of a liquid contained in a Petri dish when exposed to electromagnetic waves excited in a rectangular waveguide. Solutions exhibit high-gradients due to the presence of the dielectric liquid contained in the dish. Furthermore,… Elsevier BV	2013-01-01
The Cost of Continuity: Performance of Iterative Solvers on Isogeometric Finite Elements Authors: Victor M. Calo,Nathan Collier,Lisandro Dalcin,David Pardo In this paper we study how the use of a more continuous set of basis functions affects the cost of solving systems of linear equations resulting from a discretized Galerkin weak form. Specifically, we compare performance of linear solvers when discretizing using $C^0$ B-splines, which span… Society for Industrial & Applied Mathematics (SIAM)	2013-01-01
Critical Issues in Model-Based Surrogate Functions in Estimation of Distribution Algorithms Authors: Jose A. Lozano,Alexander Mendiburu,Roberto Santana In many optimization domains the solution of the problem can be made more efficient by the construction of a surrogate fitness model. Estimation of distribution algorithms (EDAs) are a class of evolutionary algorithms particularly suitable for the conception of model-based surrogate techniques.… Springer International Publishing	2013-01-01
PATHSenrich: A Web Service Prototype for Automatic Cultural Heritage Item Enrichment Authors: Eneko Agirre,Kike Fernandez,Ander Barrena,Aitor Soroa,Arantxa Otegi,Esther Miranda Large amounts of cultural heritage material are nowadays available through online digital library portals. Most of these cultural items have short descriptions and lack rich contextual information. The PATHS project has developed experimental enrichment services. As a proof of concept, this paper… Springer Berlin Heidelberg	2013-01-01
A three-dimensional self-adaptive hp finite element method for the characterization of waveguide discontinuities Authors: Gómez Revuelto, Ignacio,García Castillo, Luis E.,Llorente Romano, Sergio,Pardo, David We propose the use of a highly-accurate three-dimensional (3D) fully automatic hp-adaptive finite element method (FEM) for the characterization of rectangular waveguide discontinuities. These discontinuities are either the unavoidable result of mechanical/electrical transitions or deliberately… Elsevier BV	2012-12-01
Robustness of different TMR granularities in shared wishbone architectures on SRAM FPGA Authors: Uli Kretzschmar,Armando Astarloa,Jesús Lázaro,M. Garay,J. Del Ser Triple Module Redundancy (TMR) is a popular technique for protecting critical FPGA designs. Although automatic tools for TMR generation mostly use triplication on flip-flop level, designers may opt for different approaches. This work analyses the impact of different granularities on TMR… IEEE	2012-12-01
What mechanism of niche segregation allows the coexistence of sympatric sibling rhinolophid bats? Authors: Salsamendi Pagola, Egoitz,Garín Atorrasagasti, Ignacio,Arostegui Madariaga, Inmaculada,Goiti Ugarte, Urtzi,Aiartza Azurtza, José Ramón AbstractIntroductionOur purpose was to assess how pairs of sibling horseshoe bats coexists when their morphology and echolocation are almost identical. We collected data on echolocation, wing morphology, diet, and habitat use of sympatricRhinolophus mehelyiandR.euryale. We compared our results with… Springer Science and Business Media LLC	2012-11-13
Amino acid signatures in the Ovar-DRB1 peptide-binding pockets are associated with Ovine Pulmonary Adenocarcinoma susceptibility/resistance Authors: Koldo Garcia-Etxebarria,Ramón A. Juste,Amaia Larruskain,Begoña M. Jugo,Inmaculada Arostegui,E. Minguijón,Bernardino Moreno Potential relationships between amino acid motifs of various alleles of the ovine major histocompatibility complex DR (Ovar-DR) molecule and occurrence of clinical OPA caused by JSRV were investigated in a case-control study. Latxa sheep (n=132) screened for presence/absence of pulmonary OPA… Elsevier BV	2012-11-01
Using Multidimensional Bayesian Network Classifiers to Assist the Treatment of Multiple Sclerosis Authors: David Arteta,Aritz Pérez,J.D. Rodriguez,Diego Tejedor,Jose A. Lozano Multiple sclerosis is an autoimmune disorder of the central nervous system and potentially the most common cause of neurological disability in young adults. The clinical disease course is highly variable and different multiple sclerosis subtypes can be defined depending on the progression of the… Institute of Electrical and Electronics Engineers (IEEE)	2012-11-01
Vertical cloud structure of the 2009 Jupiter impact based on HST/WFC3 observations Authors: Santiago Pérez-Hoyos,J. F. Sanz-Requena,John Clarke,Michael H. Wong,Keith S. Noll,Agustín Sánchez-Lavega,H. B. Hammel,G. S. Orton,Amy A. Simon-Miller,I. de Pater Abstract The impact of a body of unknown origin with Jupiter in July 2009 produced an intense perturbation of the planet’s atmosphere at the visible cloud levels. The vertical cloud structure was deeply affected by the presence of a strongly absorbing dense aerosol layer that was expanded… Elsevier BV	2012-11-01
The origin and evolution of Saturn’s 2011–2012 stratospheric vortex Authors: Agustín Sánchez-Lavega,Pgj Irwin,James Sinclair,Jon Legarreta,G. S. Orton,Gordon L. Bjoraker,Amy A. Simon-Miller,Brigette E. Hesman,Peter L. Read,N. Gorius,F. M. Flasar,Jane Hurley,Leigh N. Fletcher,R. K. Achterberg,Enrique Garcia-Melendo The planet-encircling springtime storm in Saturn's troposphere (December 2010-July 2011, Fletcher, L.N. et al. [2011]. Science 332, 1413-1414; Sánchez-Lavega, A. et al. [2011]. Nature 475, 71-74; Fischer, G. et al. [2011]. Nature 475, 75-77) produced dramatic perturbations to stratospheric… Elsevier BV	2012-11-01
Efficient design of a double‐band coplanar hybrid antenna using multi‐objective evolutionary programming Authors: Itziar Landa-Torres,Rocio Sanchez-Montero,Pablo López-Espí,J. Del Ser,Diana Manjarres,Sancho Salcedo-Sanz SUMMARYIn this paper, we propose the optimization of the parameters of a hybrid antenna for wireless applications by using a multi‐objective evolutionary programming (EP). Specifically, the antenna proposed is formed by a planar inverted‐F antenna and a coplanar patch, in the same structure. The… Wiley	2012-10-16
Asymptotic analysis of flooding in CSMA-based large scale ad-hoc wireless networks Authors: Shah-Mansouri, Hamed,Khalaj, Babak Hossein,Shariatpanahi, Seyed Pooya,Ser, Javier Del,Pérez-Sánchez, Susana Abstract Abstract In this article, we study the asymptotic behavior of flooding in large scale wireless networks. Specifically, we derive an upper bound on the coverage of flooding when the number of nodes n in the network goes to infinity. We consider two… Springer Science and Business Media LLC	2012-10-12
Solution of the 3D-Helmholtz equation in exterior domains using spherical harmonic decomposition Authors: Garate, G.,Vadillo, E.G.,Santamaria, J.,Pardo, D. This work is devoted to a finite element formulation for the Helmholtz equation in exterior domains. The proposed formulation uses a separation of variables, combining a 2D FE discretization on an intermediate spherical boundary and an 'a priori' analytical pattern for the radial direction. Using… Elsevier BV	2012-10-01
PlanetCam UPV/EHU: a simultaneous visible and near infrared lucky-imaging camera to study solar system objects Authors: Santiago Pérez-Hoyos,Ricardo Hueso,Agustín Sánchez-Lavega,Gaizka Murga,L. de Bilbao,Jose Félix Rojas,Javier Ariño PlanetCam is a two-channel camera designed primarily to observe the atmospheres of the planets (Venus, Mars, Jupiter, Saturn, Uranus and Neptune) and the satellite Titan simultaneously at visible (0.4-1 microns) and NIR (1-2.5 microns) wavelengths with high temporal and spatial resolution. This… SPIE	2012-09-24
Analysis of quantization effects on the performance of cooperative MIMO techniques in wireless networks Authors: Shariatpanahi, Seyed Pooya,Khalaj, Babak Hossein,Shah-Mansouri, Hamed,Del Ser, Javier Abstract The most successful achievable schemes for ad hoc wireless networks are those based on establishing cooperative multiple-input and multiple-output links. In this article, we analyze one of the important design parameters of such schemes, namely the number of quantization bits.… Springer Science and Business Media LLC	2012-09-18
Probing clouds in planets with a simple radiative transfer model: the Jupiter case Authors: Santiago Pérez-Hoyos,Agustín Sánchez-Lavega,I. Mendikoa Remote sensing of planets evokes using expensive on-orbit satellites and gathering complex data from space. However, the basic properties of clouds in planetary atmospheres can be successfully estimated with small telescopes even from an urban environment using currently available and affordable… IOP Publishing	2012-09-12
On the design of an heuristically optimized multiband spectrum sensing approach for cognitive radio systems Authors: A. Alonso,Uli Kretzschmar,J. Del Ser,Sergio Gil-Lopez,Armando Astarloa,M. Garay This extended abstract outlines a novel optimization approach for multi-band linear collaborative spectrum (LCS) sensing based on harmony search heuristics. Besides, the description of a centralized system architecture is also included in this manuscript, which is capable of processing the captured… IEEE	2012-09-01
A hybrid harmony search algorithm for the spread spectrum radar polyphase codes design problem Authors: Ángel M. Pérez-Bellido,Jose A. Portilla-Figueras,Javier Del Ser,Sancho Salcedo-Sanz,Sergio Gil-Lopez,José María Cabero In this paper we present the application of a hybrid harmony search (HS) algorithm to the Spread-Spectrum Radar Polyphase (SSRP) codes design. Such a design can be formulated as a non-linear max-min optimization problem, hard to be solved using classical numerical techniques. Soft-computing… Elsevier BV	2012-09-01
Hydrofracture diagnosis in open-hole and steel-cased wells using borehole resistivity measurements Authors: Carlos Torres-Verdín,David Pardo This work numerically evaluates the possibility of using electromagnetic (EM) measurements to diagnose and quantify hydraulic fractures that are artificially generated in a horizontal well. Hydrofractures are modeled as thin disks that are possibly non-perpendicular to the well, and are filled with… Society of Exploration Geophysicists	2012-09-01
Flexible Channel Coding Approach for Short-Length Codewords Authors: Mikel Hernaez,Javier Del Ser,Pedro M. Crespo 4 pages; submitted to IEEE Communications Letters Institute of Electrical and Electronics Engineers (IEEE)	2012-09-01