Publications

Displaying 1001 - 1025 of 1351

Publication	Date
Uncertainty principle of Morgan type and Schrödinger evolutions Authors: Luis Escauriaza,Carlos E. Kenig,Luis Vega,Gustavo Ponce We prove unique continuation properties for solutions of evolution Schr��dinger equation with time dependent potentials. In the case of the free solution these correspond to uncertainly principles referred to as being of Morgan type. As an application of our method we also obtain results concerning… Wiley	2010-12-20
A multi-wavelength study of the 2009 impact on Jupiter: Comparison of high resolution images from Gemini, Keck and HST Authors: Michael H. Wong,Santiago Pérez-Hoyos,Statia Luszcz-Cook,Glenn S. Orton,Mark Boslough,Agustín Sánchez-Lavega,Heidi B. Hammel,Leigh N. Fletcher,Imke de Pater Within several days of A. Wesley's announcement that Jupiter was hit by an object on UT 19 July 2009, we observed the impact site with (1) the Hubble Space Telescope (HST) at UV through visible (225-924nm) wavelengths, (2) the 10-m W.M. Keck II telescope in the near-infrared (1-5μm), and (3) the 8-… Elsevier BV	2010-12-01
The Planetary Laboratory for Image Analysis (PLIA) Authors: Jose Félix Rojas,Agustín Sánchez-Lavega,Javier Peralta,Ricardo Hueso,Santiago Pérez-Hoyos,T. del Río-Gaztelurrutia,Jon Legarreta The observation, characterization, and understanding of planetary atmospheres are key components of Solar System exploration. Their study requires, among other observations, the use of image data acquired from spacecrafts. The basic tasks that are generally used to work with planetary image data… Elsevier BV	2010-11-01
Multi-marker tagging single nucleotide polymorphism selection using estimation of distribution algorithms Authors: Eleazar Eskin,Jose A. Lozano,Alexander Mendiburu,Roberto Santana,Noah Zaitlen This paper presents an optimization algorithm for the automatic selection of a minimal subset of tagging single nucleotide polymorphisms (SNPs).The determination of the set of minimal tagging SNPs is approached as an optimization problem in which each tagged SNP can be covered by a single tagging… Elsevier BV	2010-11-01
A strong high altitude narrow jet detected at Saturn's equator Authors: Jon Legarreta,Santiago Pérez-Hoyos,Agustín Sánchez-Lavega,Enrique Garcia-Melendo,Ricardo Hueso Here we report the discovery at the upper cloud level of an extremely narrow and strong prograde jet, centered in the middle of the broad equatorial jet. Measurements from images obtained by the Cassini Imaging Science Subsystem (ISS) show that the jet reaches 430 ms−1 ± 16 m s−1 with a peak speed… American Geophysical Union (AGU)	2010-11-01
Assessment of Delaware and Groningen effects on dual-laterolog measurements with a self-adaptive hp finite-element method Authors: Carlos Torres-Verdín,Myung Jin Nam,David Pardo We describe numerical simulations of anomalous dual-laterolog (DLL) borehole measurements, including Delaware and Groningen effects. Both effects give rise to abnormally high readings of DLL measurements under extreme logging conditions. Specifically, a low resistive bed below a highly resistive… Society of Exploration Geophysicists	2010-11-01
Methodology and construction of the Basque WordNet Authors: Eneko Agirre,Izaskun Aldezabal,Elisabete Pociello Semantic interpretation of language requires extensive and rich lexical knowledge bases (LKB). The Basque WordNet is a LKB based on WordNet and its multilingual counterparts EuroWordNet and the Multilingual Central Repository. This paper reviews the theoretical and practical aspects of the Basque… Springer Science and Business Media LLC	2010-10-16
Graph-based Word Sense Disambiguation of biomedical documents Authors: Eneko Agirre,Aitor Soroa,Mark Stevenson Abstract Motivation: Word Sense Disambiguation (WSD), automatically identifying the meaning of ambiguous words in context, is an important stage of text processing. This article presents a graph-based approach to WSD in the biomedical domain. The method is unsupervised and does not… Oxford University Press (OUP)	2010-10-07
Agent-Based Modelling of Socio-Ecosystems Authors: BALBI, Stefano,GIUPPONI, Carlo The integrated—environmental, economic and social—analysis of climate change calls for a paradigm shift as it is fundamentally a problem of complex, bottom-up and multi-agent human behaviour. There is a growing awareness that global environmental change dynamics and the related socio-economic… IGI Global	2010-10-01
A long-lived cyclone in Saturn’s atmosphere: Observations and models Authors: T. del Río-Gaztelurrutia,Agustín Sánchez-Lavega,Santiago Pérez-Hoyos,Jon Legarreta,Ricardo Hueso Abstract The atmospheres of the giant planets Jupiter and Saturn possess large numbers of vortices (closed circulation ovals). On the larger scale, above 2000 km, anticyclones on Jupiter and Saturn are generally long-lived coherent structures while cyclones survive a much shorter time and behave… Elsevier BV	2010-10-01
Statistical approaches to analyse patient-reported outcomes as response variables: An application to health-related quality of life Authors: Vicente Núñez-Antón,Inmaculada Arostegui,José M. Quintana Patient-reported outcomes (PRO) are used as primary endpoints in medical research and their statistical analysis is an important methodological issue. Theoretical assumptions of the selected methodology and interpretation of its results are issues to take into account when selecting an appropriate… SAGE Publications	2010-09-21
FIRST EARTH-BASED DETECTION OF A SUPERBOLIDE ON JUPITER Authors: Hueso, R.,Wesley, A.,Go, C.,Pérez-Hoyos, S.,Wong, M. H.,Fletcher, L. N.,Sánchez-Lavega, A.,Boslough, M. B. E.,de Pater, I.,Orton, G. S.,Simon-Miller, A. A.,Djorgovski, S. G.,Edwards, M. L.,Hammel, H. B.,Clarke, J. T.,Noll, K. S.,Yanamandra-Fisher, P. A. Cosmic collisions on planets cause detectable optical flashes that range from terrestrial shooting stars to bright fireballs. On June 3, 2010 a bolide in Jupiter's atmosphere was simultaneously observed from the Earth by two amateur astronomers observing Jupiter in red and blue wavelengths. The… American Astronomical Society	2010-09-09
A novel Harmony Search based spectrum allocation technique for cognitive radio networks Authors: Del Ser, Javier,Matinmikko, Marja,Gil-Lopez, Sergio,Mustonen,Miia This paper outlines the application of the heuristic Harmony Search (HS) algorithm for efficient spectrum allocation in cognitive radio networks under a minimum Bit Error Rate (BER) criterion. Our proposed algorithm provides a higher degree of diversity in the search process by virtue of its… IEEE	2010-09-01
A novel CAM-based traffic light preemption algorithm for efficient guidance of emergency vehicles Authors: Javier Del Ser,Galder Unibaso,Begona Molinete,Sergio Gil-Lopez on efficiently handling traffic signalling for emergency vehicles via minimally-invasive schemes, in this manuscript we propose a novel traffic light preemption algorithm based on processing part of the Cooperative Awareness Messages (CAM) already defined in the so-called European Intelligent… IEEE	2010-09-01
Centralized synchronization methods for distributed detection in sensor networks Authors: Ignacio Olabarrieta,Javier Del Ser In this paper we consider a network of distributed sensors which simultaneously measure a physical parameter of interest, subject to a certain sensing error probability. The sensed information at each of such nodes is forwarded to a central receiver through parallel independent AWGN channels. In… IEEE	2010-09-01
Relationship between total hip replacement appropriateness and surgical priority instruments Authors: Mireia Espallargues,Antonio Escobar,Alejandro Allepuz,Montse Moharra,José M. Quintana,Inmaculada Arostegui AbstractRationale Variability in indications for total hip replacement (THR) and unequal waiting times may limit health care access.Objective To analyse the relationship between appropriateness and previously developed surgical priority instruments.Method Multicentre cross‐validation study of… Wiley	2010-08-27
Decision Trees for Indication of Cataract Surgery Based on Changes in Visual Acuity Authors: Gema Navarro,Txomin Alberdi,Antonio Escobar,Inmaculada Arostegui,Belen Elizalde,Emilio Perea,Elena Andradas,José M. Quintana To develop decision trees based on prospectively collected data for determining the appropriateness of cataract extraction.Prospective observational cohort study.Consecutive patients with a diagnosis of cataract who are on waiting lists to undergo cataract extraction by phacoemulsification.Patients… Elsevier BV	2010-08-01
Simulation of marine controlled source electromagnetic measurements using a parallel fourier hp-finite element method Authors: Michael G. Hoversten,Carlos Torres-Verdín,David Pardo,Iñaki Garay,Iñaki Garay,Myung Jin Nam We introduce a new numerical method to simulate geophysical marine controlled source electromagnetic (CSEM) measurements for the case of 2D structures and finite 3D sources of electromagnetic (EM) excitation. The method of solution is based on a spatial discretization that combines a 1D Fourier… Springer Science and Business Media LLC	2010-07-09
Schrodinger Maps and their Associated Frame Systems Authors: Nahmod, Andrea,Shatah, Jalal,Vega, Luis,Zeng, Chongchun In this paper we establish the equivalence of solutions between Schr��dinger map into $\mathbb{S}^2$ or $ \mathbb{H}^2$ and their associated gauge invariant Schr��dinger equations. We also establish the existence of global weak solutions into $\mathbb{H}^2$ in two space dimensions. We extend these… Oxford University Press (OUP)	2010-07-08
Joint Source-Channel Coding of Sources with Memory using Turbo Codes and the Burrows-Wheeler Transform Authors: Inaki Esnaola,Javier Garcia-Frias,Javier Del Ser,Pedro M. Crespo The Burrows-Wheeler Transform (BWT) is a block sorting algorithm which has been proven to be useful in compressing text data . More recently, schemes based on the BWT have been proposed for lossless data compression using LDPC and Fountain codes, as well as for joint source-channel coding of… Institute of Electrical and Electronics Engineers (IEEE)	2010-07-01
Estimation of Bayesian networks algorithms in a class of complex networks Authors: Alexander Mendiburu,Carlos Echegoyen,Roberto Santana,Jose A. Lozano In many optimization problems, regardless of the domain to which it belongs, the structural component that the interactions among variables provides can be seen as a network. The impact that the topological characteristics of that network has, both in the hardness of the problem and in the… IEEE	2010-07-01
Unified Modeling Language description of the object-oriented multi-scale adaptive finite element method for Step-and-Flash Imprint Lithography Simulations Authors: Paszynski, M.,Gurgul, P.,Sieniek, M.,Pardo, D. In the first part of the paper we present the multi-scale simulation of the Step-and-Flash Imprint Lithography (SFIL), a modern patterning process. The simulation utilizes the hp adaptive Finite Element Method (hp-FEM) coupled with Molecular Statics (MS) model. Thus, we consider the multi-scale… IOP Publishing	2010-06-01
THE IMPACT OF A LARGE OBJECT ON JUPITER IN 2009 JULY Authors: Santiago Pérez-Hoyos,Ricardo Hueso,J. L. Ortiz,Agustín Sánchez-Lavega,I. de Pater,G. S. Orton,Enrique Garcia-Melendo,P. Yanamandra-Fisher,Amy A. Simon-Miller,J. M. Gómez-Forrellad,H. B. Hammel,Richard C. Puetter,A. Wesley,Jon Legarreta,Leigh N. Fletcher,… 15 pages, 5 figures American Astronomical Society	2010-05-12
*JUPITER AFTER THE 2009 IMPACT: HUBBLE SPACE TELESCOPE* IMAGING OF THE IMPACT-GENERATED DEBRIS AND ITS TEMPORAL EVOLUTION** Authors: John Clarke,Ricardo Hueso,Agustín Sánchez-Lavega,Leigh N. Fletcher,I. de Pater,Heidi B. Hammel,Santiago Pérez-Hoyos,K. Noll,P. Yanamandra-Fisher,G. S. Orton,Amy A. Simon-Miller,Michael H. Wong,Michael H. Wong We report Hubble Space Telescope images of Jupiter during the aftermath of an impact by an unknown object in 2009 July. The 2009 impact-created debris field evolved more slowly than those created in 1994 by the collision of the tidally disrupted comet D/Shoemaker-Levy 9 (SL9). The slower evolution… American Astronomical Society	2010-05-12
Simulation of triaxial induction measurements in dipping, invaded, and anisotropic formations using a Fourier series expansion in a nonorthogonal system of coordinates and a self-adaptive hp finite-element method Authors: Carlos Torres-Verdín,David Pardo,Myung Jin Nam Borehole triaxial induction instruments were designed to diagnose and measure rock electrical conductivity parallel and perpendicular to the bedding plane. Experience has shown that the interpretation of triaxial induction measurements often requires numerical modeling for a proper diagnosis of… Society of Exploration Geophysicists	2010-05-01