Publications

Displaying 1076 - 1100 of 1351

Publication	Date
IXA at CLEF 2008 Robust-WSD Task: Using Word Sense Disambiguation for (Cross Lingual) Information Retrieval Authors: German Rigau,Eneko Agirre,Arantxa Otegi This paper describes experiments for the CLEF 2008 Robust-WSD task, both for the monolingual (English) and the bilingual (Spanish to English) subtasks. We tried several query and document expansion and translation strategies, with and without the use of the word sense disambiguation results… Springer Berlin Heidelberg	2009-01-01
Price Regulation in Greenhouse Gas Emissions Cap-and-Trade Systems: From Theory to Policies Authors: Stefano Balbi Notwithstanding the infinite debate on price versus quantity instruments in the design of a global climate policy, Cap-and-Trade systems are dominating the policymakers' choices worldwide. This is a prime issue for the traditional equilibrium economics, which has argued that the structure of the… Elsevier BV	2009-01-01
A Numerical Study of the Self-Similar Solutions of the Schrödinger Map Authors: Luis Vega,Carlos J. García-Cervera,F. de la Hoz We present a numerical study of the self-similar solutions of the Localized Induction Approximation of a vortex filament. These self-similar solutions, which constitute a one-parameter family, develop a singularity at finite time. We study a number of boundary conditions that allow us reproduce the… Society for Industrial & Applied Mathematics (SIAM)	2009-01-01
Saturn Atmospheric Structure and Dynamics Authors: Agustín Sánchez-Lavega,F. Michael Flasar,Anthony D. Del Genio,Adam P. Showman,Richard K. Achterberg,Kevin H. Baines,Peter L. Read Saturn inhabits a dynamical regime of rapidly rotating, internally heated atmospheres similar to Jupiter. Zonal winds have remained fairly steady since the time of Voyager except in the equatorial zone and slightly stronger winds occur at deeper levels. Eddies supply energy to the jets at a rate… Springer Netherlands	2009-01-01
Towards a Strategy for Moving Trinidad and Tobago to Renewable Technologies Authors: Anthony E. Paul,Stefano Balbi Renewables have been a matter of political discussions in Trinidad and Tobago for more than twenty years. To date, however, no comprehensive policies, or consistent elements leading to their creation, have been adopted. The intent of this paper is to demonstrate that key incentives which might… Elsevier BV	2009-01-01
Cap-and-Trade Systems Versus Carbon Taxes: A Reflection in View of Copenhagen 2009 Authors: Stefano Balbi Cap-and-trade systems are dominating worldwide the policy-makers' choices about the design of climate policies. This is an issue for several of economists, who are arguing that the structure of the costs and damages of climate change gives a strong presumption to price-type approaches. Those who… Elsevier BV	2009-01-01
CLEF 2008: Ad Hoc Track Overview Authors: AGIRRE E,DI NUNZIO, GIORGIO MARIA,FERRO, NICOLA,MANDL T,PETERS C. We describe the objectives and organization of the CLEF 2008 Ad Hoc track and discuss the main characteristics of the tasks offered to test monolingual and cross-language textual document retrieval systems. The track was changed considerably this year with the introduction of tasks with new… Springer Berlin Heidelberg	2009-01-01
Coupled Surge-Heave-Pitch Dynamic Modeling of Spar-Moonpool-Riser Interaction Authors: Spanos P. D.,Nava V.,Arena F. Due to the ongoing rather intense development of deep water gas and oil fields, the technical community has been increasingly focusing its attention to the dynamic behavior of Spar floating structures. Spar dynamics exhibits a highly nonlinear behavior due to the presence of various components such… ASMEDC	2009-01-01
Coupled Surge-Heave-Pitch Dynamic Modeling of Spar-Moonpool-Riser Interaction Authors: Vincenzo Nava,Pol D. Spanos,Felice Arena Due to the rather intense ongoing development of deep water gas and oil fields, the technical community has devoted considerable attention to the dynamic behavior of Spar floating systems. Spar dynamics exhibits a highly nonlinear behavior due to the presence of various components such as mooring… ASME International	2009-01-01
Simulation of DC dual-laterolog measurements in complex formations: A Fourier-series approach with nonorthogonal coordinates and self-adapting finite elements Authors: Nam, M.J.,Pardo, D.,Torres-Verdin, C. Dual laterolog (DLL) makes use of a galvanic conduction principle to focus electrical currents into rock formations, thereby minimizing shoulder and borehole effects in the measurement of formation resistivity. The tool includes two separate focusing systems: deep-sensing (LLd) and shallow-sensing… Society of Exploration Geophysicists	2009-01-01
Performance Analysis of a Novel Dual-Frequency Multiple Access Relay Transmission Scheme Authors: Babak Hossein Khalaj,Javier Del Ser In this paper we present the performance analysis of a novel channel assignment scheme where two non-cooperative independent users simultaneously communicate with their destination through a single relay by using only two frequency channels. The analytic derivation of the probability of symbol… Scientific Research Publishing, Inc.	2009-01-01
Overview of the Clef 2008 Multilingual Question Answering Track Authors: Paulo Rocha,Anselmo Peñas,Eneko Agirre,Nicolas Moreau,Pamela Forner,Bogdan Sacaleanu,Erik Tjong Kim Sang,Corina Forascu,Petya Osenova,Iñaki Alegria,Prokopis Prokopidis,Richard F. E. Sutcliffe The QA campaign at CLEF 2008 [1], was mainly the same as that proposed last year. The results and the analyses reported by last year's participants suggested that the changes introduced in the previous campaign had led to a drop in systems' performance. So for this year's competition it has been… Springer Berlin Heidelberg	2009-01-01
Joint Source-Channel-Network Decoding and Blind Estimation of Correlated Sensors Using Concatenated Zigzag Codes Authors: Pedro M. Crespo,Ignacio Olabarrieta,Javier Del Ser,Mikel Mendicute,Sergio Gil-Lopez Focusing on densely deployed wireless sensor networks, this paper presents a novel method for joint source-channel-network coding of distributed correlated sources through multiple access relay channels. In such networks, the role of intermediate sensors as relay nodes permits to achieve enhanced… Springer Berlin Heidelberg	2009-01-01
Magnetic virial identities, weak dispersion and Strichartz inequalities Authors: Luis Vega,Luca Fanelli 23 pages, misprint in the title of the previous version Springer Science and Business Media LLC	2008-12-13
Energy-Norm-Based and Goal-Oriented Automatic $hp$ Adaptivity for Electromagnetics: Application to Waveguide Discontinuities Authors: Garcia-Castillo, L.E.,Pardo, D.,Demkowicz, L. The finite-element method (FEM) enables the use of adapted meshes. The simultaneous combination of h (local variations in element size) and p (local variations in the polynomial order of approximation) refinements, i.e., hp-adaptivity, is the most powerful and flexible type of adaptivity. In this… Institute of Electrical and Electronics Engineers (IEEE)	2008-12-01
Three-dimensional nonlinear random wave groups in intermediate water depth Authors: Diego Pavone,Diego Pavone,Vincenzo Nava,Vincenzo Nava,Felice Arena,Alessandra Romolo,Alfredo Ascanelli Abstract High waves at ocean occur during a complex space–time evolution of wave groups. In this paper the nonlinear structure of three-dimensional sea wave groups at intermediate water depth is investigated. To this purpose, the Boccotti's Quasi-Determinism theory is firstly applied to describe… Elsevier BV	2008-12-01
On the Stability of a Singular Vortex Dynamics Authors: Banica, Valeria,Vega, Luis In this paper we address the question of the singular vortex dynamics exhibited in [15], which generates a corner in finite time. The purpose is to prove that under some appropriate small regular perturbation the corner still remains. Our approach uses the Hasimoto transform and deals with the long… Springer Science and Business Media LLC	2008-11-19
Sensitivity study of borehole-to-surface and crosswell electromagnetic measurements acquired with energized steel casing to water displacement in hydrocarbon-bearing layers Authors: Pardo, D.,Torres-Verdin, C.,Zhang, Z. We study the theoretical response of electromagnetically energized steel casing in the presence of subsurface variations of electrical resistivity. Casing is energized with a finite-size solenoid antenna located along the axis of the borehole. Measurements consist of the azimuthal component of the… Society of Exploration Geophysicists	2008-11-01
Optimizing the number of classes in automated zooplankton classification Authors: Jose A. Fernandes,Jose A. Lozano,Xabier Irigoien,Guillermo Boyra,Iñaki Inza Zooplankton biomass and abundance estimation, based on surveys or time-series, is carried out routinely. Automated or semi-automated image analysis processes, combined with machine-learning techniques for the identification of plankton, have been proposed to assist in sample analysis. A difficulty… Oxford University Press (OUP)	2008-10-22
Design, Simulation and Implementation of a Channel Equalizer for DVB-T On-channel Repeaters Authors: Iker Sobron,Pablo Prieto,J. Del Ser,R. Isasi,Mikel Mendicute This article describes the design and implementation of a channel equalizer for a terrestrial digital television (digital video broadcasting-terrestrial, DVB-T) on-channel repeater, namely gap-filler. Two are the benefits of including this equalizer in a repeater setup: on one hand, the transmitted… IEEE	2008-10-01
A review of estimation of distribution algorithms in bioinformatics Authors: Armañanzas, Rubén,Inza, Iñaki,Santana, Roberto,Saeys, Yvan,Flores, Jose Luis,Lozano, Jose Antonio,Van de Peer, Yves,Blanco, Rosa,Robles, Victor,Bielza, Concha,Larrañaga, Pedro Evolutionary search algorithms have become an essential asset in the algorithmic toolbox for solving high-dimensional optimization problems in across a broad range of bioinformatics problems. Genetic algorithms, the most well-known and representative evolutionary search technique, have been the… Springer Science and Business Media LLC	2008-09-11
Multi-Objective Learning of Multi-Dimensional Bayesian Classifiers Authors: J.D. Rodriguez,Jose A. Lozano Multi-dimensional classification is a generalization of supervised classification that considers more than one class variable to classify. In this paper we review the existing multi-dimensional Bayesian classifiers and introduce a new one: the KDB multi-dimensional classifier. Then we define… IEEE	2008-09-01
Parameters affecting shock decision in pediatric automated defibrillation Authors: S.R. de Gauna,Elisabete Aramendi,Unai Irusta,Jesus Ruiz There are important differences between adult and pediatric ECG. To approve their use in children, the adaptation of automated external defibrillator (AED) shock advice algorithms require a specific analysis of the particular pediatric ECG characteristics. In this study, we measured several… IEEE	2008-09-01
Uncoded optimal binary communication for sources with memory using the Burrows Wheeler Transform Authors: Javier Del Ser,Estíbaliz Loyo,Pedro M. Crespo Abstract Given an AWGN channel, we look at the problem of designing an optimal binary uncoded communication system for transmitting blocks of binary symbols generated by a stationary source with memory modelled by a Markov chain (MC) or a hidden Markov model (HMM). The goal is to minimize the… Elsevier BV	2008-09-01
An algorithm to discriminate SVT from VT in pediatric AED based on spectral parameters Authors: Elisabete Aramendi,Unai Irusta,S.R. de Gauna,Jesus Ruiz Supraventricular tachycardia (SVT) often has very high heart rates in children. Automated external defibrillators (AED), whose use for children is recommended since 2003, could misinterpret high rate SVT as ventricular tachycardia (VT) producing an incorrect shock diagnosis. The objective of this… IEEE	2008-09-01