Publications

Displaying 1076 - 1100 of 1307

Publication	Date
Jupiter's polar clouds and waves from Cassini and HST images: 1993–2006 Authors: Agustín Sánchez-Lavega,Ricardo Hueso,N. Barrado-Izagirre,Santiago Pérez-Hoyos Abstract For a variety of reasons, Jupiter's polar areas are probably the less observed regions of the planet. To study the dynamics and cloud vertical structure in the polar regions of the planet (latitudes 50° to 80° in both hemispheres) we have used images of Jupiter obtained from the… Elsevier BV	2008-03-01
Asymptotic Lower Bounds for a Class of Schrödinger Equations Authors: VEGA L,VISCIGLIA, NICOLA 24 pages. to appear on Comm. Math. Phys Springer Science and Business Media LLC	2008-02-22
A Preliminary Study on the Robustness and Generalization of Role Sets for Semantic Role Labeling Authors: Beñat Zapirain,Eneko Agirre,Lluís Màrquez Most Semantic Role Labeling (SRL) systems rely on available annotated corpora, being PropBank the most widely used corpus so far. Propbank role set is based on theory-neutral numbered arguments, which are linked to fine grained verb-dependant semantic roles through the verb framesets. Recently,… Springer Berlin Heidelberg	2008-02-09
Erratum: Depth of a strong jovian jet from a planetary-scale disturbance driven by storms Authors: G. S. Orton,Santiago Pérez-Hoyos,M. Valimberti,P. Yanamandra-Fisher,Ricardo Hueso,M. H. Wong,M. Salway,Noemi Pinilla-Alonso,Zac Pujic,Joseph L. Hora,F. Carvalho,J. Joels,Leigh Fletcher,A. Sánchez-Lavega,Enrique Garcia-Melendo,I. de Pater,J. Kemerer,D.… Springer Science and Business Media LLC	2008-02-01
A method to remove CPR artefacts from human ECG using only the recorded ECG Authors: Elisabete Aramendi,Sofía Ruiz de Gauna,Jo Kramer-Johansen,Trygve Eftestøl,Unai Irusta,Jesus Ruiz To show the possibility of using cardiopulmonary resuscitation (CPR) artefact suppression methods that do not need additional reference signals to model CPR artefacts.A CPR suppression method based on a Kalman filter was designed. The artefact was modelled using the fundamental frequency of the… Elsevier BV	2008-02-01
Improved dual frequency multiple access relay scheme for spatially correlated sources Authors: Pedro M. Crespo,Jose Angel Esteban,Javier Del Ser,Babak Hossein Khalaj We consider the non-cooperative multiple access relay channel, where N users transmit their information to a common receiver with the assistance of a shared relay. For N = 2 independent sources and dual-frequency operation (i.e. two separate frequency channels are available for transmission), it… IEEE	2008-02-01
Bounds for the maximal function associated to periodic solutions of one-dimensional dispersive equations Authors: Luis Vega,A. Moyua We give bounds on sup t \|u(x, t)\| for solutions u of dispersive equations on the one-dimensional torus. They are obtained from some improvements on bilinear types of estimate. Wiley	2008-02-01
Depth of a strong jovian jet from a planetary-scale disturbance driven by storms Authors: Sánchez-Lavega, A,Orton, G,Hueso, R,García-Melendo, E,Pérez-Hoyos, S,Simon-Miller, A,Rojas, J,Gómez, J,Yanamandra-Fisher, P,Fletcher, L,Joels, J,Kemerer, J,Hora, J,Karkoschka, E,de Pater, I,Wong, M,Marcus, P,Pinilla-Alonso, N,Carvalho, F,Go, C,Parker, D,… The atmospheres of the gas giant planets (Jupiter and Saturn) contain jets that dominate the circulation at visible levels. The power source for these jets (solar radiation, internal heat, or both) and their vertical structure below the upper cloud are major open questions in the atmospheric… Springer Science and Business Media LLC	2008-01-24
DYNAMIC SEARCH SPACE TRANSFORMATIONS FOR SOFTWARE TEST DATA GENERATION Authors: Ramón Sagarna,Jose A. Lozano Among the tasks in software testing, test data generation is particularly difficult and costly. In recent years, several approaches that use metaheuristic search techniques to automatically obtain the test inputs have been proposed. Although work in this field is very active, little attention has… Wiley	2008-01-21
Determination of Riser Tensioner Properties From Full-Scale Data Authors: Himanshu Gupta,Pol D. Spanos,Vincenzo Nava,Vasileios Gkaras,Hugh Banon Tensioners are used for supporting various kinds of production and drilling risers on offshore platforms. All permanent production facilities (such as TLP’s and Spar’s) have employed tensioners to support their dry tree production risers. The key design parameters for the tensioners design are… ASMEDC	2008-01-01
PML Enhanced with a Self-Adaptive Goal-Oriented $hp$-Finite Element Method: Simulation of Through-Casing Borehole Resistivity Measurements Authors: Pardo, D.,Demkowicz, L.,Torres-Verdin, C.,Michler, Christian We describe the application of a perfectly matched layer (PML) combined with a self-adaptive goal-oriented $hp$-finite element (FE) method to the simulation of borehole resistivity measurements. The adaptive refinements and fast convergence of the self-adaptive $hp$-FE method enhance the… Society for Industrial & Applied Mathematics (SIAM)	2008-01-01
Distribution of the O₂ infrared nightglow observed with VIRTIS on board Venus Express Authors: Gérard, Jean-Claude,Saglam, Adem,Piccioni, Giuseppe,Drossart, Pierre,Cox, Cedric,Erard, Stéphane,Hueso, R.,Sánchez-Lavega, Agustín We present characteristics of the statistical horizontal distribution of the O2 infrared nightglow over most of the southern hemisphere observed with the VIRTIS instrument over a period spanning nearly 11 months of low solar activity. We show that the distribution is inhomogeneous with the regions… American Geophysical Union (AGU)	2008-01-01
Software Metrics Mining to Predict the Performance of Estimation of Distribution Algorithms in Test Data Generation Authors: Ramón Sagarna,Jose A. Lozano Springer Berlin Heidelberg	2008-01-01
Simulations of 3D DC borehole resistivity measurements with a goal-oriented hp finite-element method. Part II: through-casing resistivity instruments Authors: Carlos Torres-Verdín,Maciej Paszyński,David Pardo We simulate direct current (DC) borehole resistivity measurements acquired in steel-cased deviated wells for the assessment of rock formation properties. The assumed data acquisition configuration considers one current (emitter) and three voltage (collector) electrodes that are utilized to measure… Springer Science and Business Media LLC	2007-12-06
Energy Concentration and Sommerfeld Condition for Helmholtz Equation with Variable Index at Infinity Authors: Luis Vega,Benoît Perthame,Benoît Perthame We consider the Helmholtz equation with a variable index of refraction $n(x)$, which is not necessarily constant at infinity but can have an angular dependency like $n(x)\to n\_\infty(x/\|x \|)$ as $\|x \|\to \infty$. Under some appropriate assumptions on this convergence and on $n\_\infty$ we prove… Springer Science and Business Media LLC	2007-11-26
A two-dimensional self-adaptive hp finite element method for the characterization of waveguide discontinuities. Part I: Energy-norm based automatic hp-adaptivity Authors: Luis E. Garcia-Castillo,Leszek Demkowicz,Ignacio Gomez-Revuelto,David Pardo Abstract The accurate analysis and characterization of waveguide discontinuities is an important issue in microwave engineering. In some cases, the discontinuities are an unavoidable result of mechanical or electric transitions which effects have to be minimized; in other cases, the… Elsevier BV	2007-11-01
Numerical models of Saturn's long-lived anticyclones Authors: García-Melendo, Enrique,Sánchez-Lavega, Agustín,Hueso, Ricardo International audience Elsevier BV	2007-11-01
A two-dimensional self-adaptive hp finite element method for the characterization of waveguide discontinuities. Part II: Goal-oriented hp-adaptivity Authors: Carlos Torres-Verdín,David Pardo,Leszek Demkowicz,Luis E. Garcia-Castillo Abstract This is the second part of the work on the analysis of different types of rectangular waveguide discontinuities by using a fully automatic hp -adaptive finite element method. In this paper, we describe a fully automatic goal-oriented hp -adaptive Finite Element (FE) strategy. The… Elsevier BV	2007-11-01
Hardy-type estimates for Dirac operators Authors: Dolbeault, Jean,Duoandikoetxea, Javier,Esteban, Maria J.,Vega, Luis International audience Societe Mathematique de France	2007-11-01
Combining variable neighborhood search and estimation of distribution algorithms in the protein side chain placement problem Authors: Santana, Roberto,Larrañaga Múgica, Pedro María,Lozano, Jose Antonio The aim of this work is to introduce several proposals for combining two metaheuristics: variable neighborhood search (VNS) and estimation of distribution algorithms (EDAs). Although each of these metaheuristics has been previously hybridized in several ways, this paper constitutes the first… Springer Science and Business Media LLC	2007-10-23
The perspective: a panorama of the Solar System Authors: Agustín Sánchez-Lavega Cambridge University Press (CUP)	2007-10-18
A reanalysis of Venus winds at two cloud levels from Galileo SSI images Authors: Ricardo Hueso,Agustín Sánchez-Lavega,Javier Peralta Abstract The global circulation of the Venus atmosphere is characterized at cloud level by a zonal super rotation studied over the years with data from a battery of spacecrafts: orbiters, balloons and probes. Among them, the Galileo spacecraft monitored the Venus atmosphere in a flyby in February… Elsevier BV	2007-10-01
On Combining Distributed Joint Source-Channel-Network Coding and Turbo Equalization in Multiple Access Relay Networks Authors: Pedro M. Crespo,B.H. Khalaj,Jesús Gutiérrez-Gutiérrez,J. Del Ser We consider a multiple access relay channel where two sources S1 and S2 send their data to a common destination node aided by a shared relay node. In this paper we extend previous work on this topic by assuming that the output of both information sources are correlated with memory. Furthermore, we… IEEE	2007-10-01
Diversity Gain Analysis of a Novel Dual-Frequency Multiple Access Relay Transmission Scheme Authors: J. Del Ser,Pedro M. Crespo,B.H. Khalaj,Jesús Gutiérrez-Gutiérrez In this paper, we will present diversity gain analysis of a novel channel assignment scheme at the relay for the case in which two non-cooperative independent users communicate with their destination through a single relay and by using only two frequency channels. The analysis of two main relay… IEEE	2007-10-01
Sequential VT/VF discrimination algorithm based on wave mode sample entropy for adult and pediatric patients Authors: Elisabete Aramendi,S.R. de Gauna,Unai Irusta,Jesus Ruiz The two fatal ventricular arrhythmias, Ventricular Fibrillation (VF) and Ventricular Tachycardia (VT), are better treated using different electrical therapies: a lower energy cardioversion for VT and a defibrillation shock for VF. Automated External Defibrillators (AED), whose use for children is… IEEE	2007-09-01