Publications

Displaying 1051 - 1075 of 1227

Publication	Date
Numerical simulation of 3D EM borehole measurements using an hp‐adaptive goal‐oriented finite‐element formulation Authors: Maciej Paszyński,Carlos Torres-Verdín,David Pardo We describe two different algorithms for automatic generation (without any user interaction) of optimal goal-oriented grids within a 3D higher-order Finite Element (FE) package, in context of simulation of electromagnetic borehole resistivity measurements for the assessment of rock formation… Society of Exploration Geophysicists	2007-01-01
On Uniqueness Properties of Solutions of Schrödinger Equations Authors: Luis Vega,Gustavo Ponce,Luis Escauriaza,Carlos E. Kenig In this paper we study uniqueness properties of solutions of Schrodinger equations of the form The aim is to deduce sufficient conditions on the asymptotic behavior of the difference of two solutio... Informa UK Limited	2006-12-01
Development of appropriateness explicit criteria for cataract extraction by phacoemulsification Authors: Quintana López, José María,Escobar, Antonio,Arostegui Madariaga, Inmaculada Abstract Background Consensus development techniques were used in the late 1980s to create explicit criteria for the appropriateness of cataract extraction. We developed a new appropriateness of indications tool for cataract following the RAND method. We tested… Springer Science and Business Media LLC	2006-12-01
Evaluation of Parallel EDAs to Create Chemical Calibration Models Authors: Jose Miguel-Alonso,Alexander Mendiburu,Jose A. Lozano Estimation of Distribution Algorithms (EDAs) are a set of optimization techniques that have been successfully applied to different kinds of problems. In this paper, we deal with the creation of multivariate calibration models in quantitative chemistry. For this purpose, we use parallel… IEEE	2006-12-01
The general quasilinear ultrahyperbolic Schrödinger equation Authors: Kenig, Carlos E.,Ponce, Gustavo,Rolvung, Christian,Vega, Luis In this work we establish a local existence theory for the initial value problem associated to the general quasi-linear ultrahyperbolic Schr��dinger equation. Elsevier BV	2006-11-01
A strong vortex in Saturn's South Pole Authors: Agustín Sánchez-Lavega,Jose Félix Rojas,Ricardo Hueso,Santiago Pérez-Hoyos Abstract Saturn's southern pole was observed at high resolution by the Cassini Imaging Science Subsystem (ISS) during the spacecraft insertion orbit in July 2004. Cloud tracking of individual features on images taken at a wavelength of 938 nm reveal the existence of a strong polar vortex enclosed… Elsevier BV	2006-10-01
Short-term changes in the belt/zone structure of Saturn's Southern Hemisphere (1996–2004) Authors: Agustín Sánchez-Lavega,Santiago Pérez-Hoyos,Richard G. French Aims. The main goal of this paper is to study the reflectivity changes that affect Saturn's global belt/zone pattern on time-scales from weeks to a few months, and to determine their frequency and intensity, as well as the variations of the vertical cloud structure that cause such changes. Methods… EDP Sciences	2006-09-12
Phase dispersion relation of the 5‐micron hot spot wave from a long‐term study of Jupiter in the visible Authors: Agustín Sánchez-Lavega,Jose Félix Rojas,A. Morgado,J. Arregi We present a long‐term study at visible wavelengths of the motions and spatial distribution of the hot spots at 7°N of Jupiter. This research involves seven years of observations of the planet between 1979 and 2002 and includes data from Voyagers 1 and 2, Hubble Space Telescope, and a number of… American Geophysical Union (AGU)	2006-09-01
On the Coexistence of Pulsed UWB Communications with TV Distribution Services over MATV Cable Networks Authors: C.J. Mitchell,Pedro M. Crespo,J. Del Ser,M. Fauri The aim of this study is to demonstrate the feasibility of employing pulsed ultra wideband (UWB) communication schemes over a communal master antenna TV system (MATV). Models for both the UWB link and the TV signal spectrum are derived in order to study their behavior. The influence of the TV… IEEE	2006-09-01
Simulation of multifrequency borehole resistivity measurements through metal casing using a goal-oriented hp finite-element method Authors: C. Torres-VerdinTorres-Verdin,Leszek Demkowicz,David Pardo The authors simulate multifrequency through-casing resistivity tool measurements operating at different frequencies in a borehole environment for the assessment of rock-formation properties. Rock formations are assumed to exhibit axial symmetry around the axis of a vertical borehole. The… Institute of Electrical and Electronics Engineers (IEEE)	2006-08-01
Parallel EDAs to create multivariate calibration models for quantitative chemical applications Authors: Jose Miguel-Alonso,C. Ubide,M. Ostra,Alexander Mendiburu,Jose A. Lozano This paper describes the application of a collection of data mining methods to solve a calibration problem in a quantitative chemistry environment. Experimental data obtained from reactions which involve known concentrations of two or more components are used to calibrate a model that, later, will… Elsevier BV	2006-08-01
Knowledge Sources for WSD Authors: Mark Stevenson,Eneko Agirre Kluwer Academic Publishers	2006-07-15
Introduction Authors: Eneko Agirre,Philip Edmonds Kluwer Academic Publishers	2006-07-15
Fully automatic hp-adaptivity in three dimensions Authors: David Pardo,Waldemar Rachowicz,Leszek Demkowicz The paper presents a three-dimensional implementation of the fully automatic hp-adaptive mesh refinement strategy proposed in [L. Demkowicz, W. Rachowicz, Ph. Devloo, A fully automatic hp-adaptivity, J. Sci. Comput. 17 (1–3) (2002) 127–155]. The methodology is based on a minimization of the… Elsevier BV	2006-07-01
Methane storms on Saturn's moon Titan Authors: Agustín Sánchez-Lavega,Ricardo Hueso The presence of dry fluvial river channels and the intense cloud activity in the south pole of Titan over the past few years suggest the presence of methane rain. The nitrogen atmosphere of Titan therefore appears to support a methane meteorological cycle that sculptures the surface and controls… Springer Science and Business Media LLC	2006-07-01
Some dispersive estimates for Schrödinger equations with repulsive potentials Authors: Barceló, Juan A.,Ruiz, Alberto,Vega, Luis Abstract We prove the local smoothing effect for Schrodinger equations with repulsive potentials for n ⩾ 3 . The estimates are global in time and are proved using a variation of Morawetz multipliers. As a consequence we give sharp constants to measure the attractive part of the potential… Elsevier BV	2006-07-01
Analysis of the short form‐36 (SF‐36): the beta‐binomial distribution approach Authors: Vicente Núñez-Antón,Inmaculada Arostegui,José M. Quintana AbstractHealth‐related quality of life (HRQoL) is an important indicator of health status and the Short Form‐36 (SF‐36) is a generic instrument to measure it. Multiple linear regression (MLR) is often used to study the relationship of HRQoL with patients' characteristics, though HRQoL outcomes tend… Wiley	2006-06-23
A Two-Dimensional Self-Adaptive $hp$ Finite Element Method for the Analysis of Open Region Problems in Electromagnetics Authors: David Pardo,Leszek Demkowicz,Ignacio Gomez-Revuelto,Luis E. Garcia-Castillo A two-dimensional self-adaptive hp finite element method (FEM) for the analysis of open region problems in electromagnetics is described. The method incorporates an iterative procedure for solving open region problems. More precisely, solution of the open problem is achieved by solving a low number… Institute of Electrical and Electronics Engineers (IEEE)	2006-05-25
‘Planetodiversity’: the variety of planets and planetary systems in the Universe Authors: Agustín Sánchez-Lavega ‘Planetodiversity’ is a composite word from planetary diversity. This denomination wants to parallel the common use of the term biodiversity employed in biology but translated here to the context of planetary sciences due to the proliferating variety of planets discovered outside the Solar System… Informa UK Limited	2006-05-01
Integration of hp-adaptivity and a two grid solver for electromagnetic problems Authors: Leszek Demkowicz,David Pardo,Jay Gopalakrishnan We present implementation details and analyze convergence of a two grid solver forming the core of a fully automatic hp-adaptive strategy for electromagnetic problems. The solver delivers a solution for a fine grid obtained from an arbitrary coarse hp grid by a global hp-refinement. The classical V… Elsevier BV	2006-04-01
IMPLEMENTATION AND PERFORMANCE EVALUATION OF A PARALLELIZATION OF ESTIMATION OF BAYESIAN NETWORK ALGORITHMS Authors: Alexander Mendiburu,Jose Miguel-Alonso,Jose A. Lozano This paper presents, discusses and evaluates parallel implementations of a set of algorithms designed for optimization tasks: Estimation of Bayesian Network Algorithms (EBNAs). These algorithms belong to the family of Evolutionary Computation. Two different APIs have been combined: message passing… World Scientific Pub Co Pte Lt	2006-03-01
Scatter Search in software testing, comparison and collaboration with Estimation of Distribution Algorithms Authors: Ramón Sagarna,Jose A. Lozano Abstract One of the main tasks software testing includes is the generation of the test cases to be used during the test. Due to its expensive cost, the automatization of this task has become one of the key issues in the area. The field of Evolutionary Testing deals with this problem by means of… Elsevier BV	2006-03-01
A goal-orientedhp-adaptive finite element method with electromagnetic applications. Part I: electrostatics Authors: Carlos Torres-Verdín,L. Tabarovsky,Leszek Demkowicz,David Pardo We describe the development and application of a finite element (FE) self-adaptive hp goal-oriented algorithm for elliptic problems. The algorithm delivers (without any user interaction) a sequence of optimal hp-grids. This sequence of grids minimizes the error of a prescribed quantity of interest… Wiley	2006-02-19
Solar flux in Saturn's atmosphere: Penetration and heating rates in the aerosol and cloud layers Authors: Agustín Sánchez-Lavega,Santiago Pérez-Hoyos Abstract In this work, we describe an analysis of the internal solar radiation fields in Saturn's atmosphere. The aim of this paper is to study how the solar radiation flux in optical wavelengths (0.25–1.0 μm) is attenuated, primarily by the effect of the aerosols located close to the tropopause… Elsevier BV	2006-02-01
Health-Related Quality of Life and Appropriateness of Knee or Hip Joint Replacement Authors: Juan Carlos Arenaza,Antonio Escobar,Inmaculada Arostegui,Amaia Bilbao,Jesús Azkarate,J. Ignacio Goenaga,José M. Quintana We studied the association between explicit appropriateness criteria for total hip joint replacement (THR) and total knee replacement (TKR) with changes in health-related quality of life of patients undergoing these procedures.Prospective observational study of 1576 consecutive patients with… American Medical Association (AMA)	2006-01-23