Publications

Displaying 1051 - 1075 of 1351

Publication	Date
Using Semantic Relatedness and Word Sense Disambiguation for (CL)IR Authors: Eneko Agirre,Arantxa Otegi,Hugo Zaragoza In this paper we report the experiments for the CLEF 2009 Robust-WSD task, both for the monolingual (English) and the bilingual (Spanish to English) subtasks. Our main experimentation strategy consisted of expanding and translating the documents, based on the related concepts of the documents. For… Springer Berlin Heidelberg	2010-01-01
The jovian anticyclone BAI. Motions and interaction with the GRS from observations and non-linear simulations Authors: Agustín Sánchez-Lavega,Ricardo Hueso,Enrique Garcia-Melendo,Santiago Pérez-Hoyos,J. González,Jon Legarreta,J. M. Gómez-Forrellad Abstract A study of the dynamics of the second largest anticyclone in Jupiter, Oval BA, and its red colour change that occurred in late 2005 is presented in a three part study. The first part, this paper, deals with its long-term kinematical and dynamical behaviour monitored since its formation… Elsevier BV	2009-10-01
A novel heuristic algorithm for multiuser detection in synchronous CDMA wireless sensor networks Authors: Ignacio Olabarrieta,Javier Del Ser,Sergio Gil-Lopez This paper introduces a novel heuristic algorithm for N-user detection in synchronous CDMA multiple access networks. In such systems, the performance of the conventional single-user detection technique (i.e. a rake receiver compounded by a set of matched filters) is clearly bounded by the well-… IEEE	2009-10-01
The jovian anticyclone BAIII. Aerosol properties and color change Authors: Agustín Sánchez-Lavega,Ricardo Hueso,Santiago Pérez-Hoyos,Enrique Garcia-Melendo,Jon Legarreta Abstract A study of the vertical cloud structure of oval BA and its red color change is presented in this third part of our complete analysis. A large interest in Jupiter’s anticyclone BA was created by its reddening that occurred between 2005 and 2006. In this work we quantify the color change… Elsevier BV	2009-10-01
H.264/SVC rate-resiliency tradeoff in faulty communications through 802.16e railway networks Authors: Iraide Unanue,Javier Del Ser,Jon Casasempere,Pedro Sanchez Focusing on 802.16e-based railway networks, our work deals with the degradation of the perceived quality of multimedia communications in presence of handover events. The movement of mobile nodes (MN) across coverage areas of distinct Base Stations (BS) involves global disconnection periods, which… IEEE	2009-10-01
Serially-concatenated LDGM codes for correlated sources over gaussian broadcast channels Authors: Mikel Hernaez,J. Del Ser,Pedro M. Crespo,Javier Garcia-Frias We propose a superposition scheme, based on the use of serially-concatenated LDGM codes, for the transmission of spatially correlated sources over Gaussian broadcast channels. The messages intended for each receiver are independently encoded using the same code. In this manner, a strong degree of… Institute of Electrical and Electronics Engineers (IEEE)	2009-10-01
Erratum to “A comparison of generalized hybrid Monte Carlo methods with and without momentum flip” [J. Comput. Phys. 228 (2009) 2256–2265] Authors: Akhmatskaya, Elena,Bou-Rabee, Nawaf,Reich, Sebastian The generalized hybrid Monte Carlo (GHMC) method combines Metropolis corrected constant energy simulations with a partial random refreshment step in the particle momenta. The standard detailed balance condition requires that momenta are negated upon rejection of a molecular dynamics proposal step.… Elsevier BV	2009-10-01
Iterative concatenated Zigzag decoding and blind data fusion of correlated sensors Authors: Javier Del Ser,Javier Garcia-Frias,Pedro M. Crespo This paper addresses the sensor network scenario where several nodes sense a common information source S. When such sensors forward their correlated observations to a common shared receiver, it is necessary to combine the received information in order to obtain an estimation of S with high… IEEE	2009-10-01
The jovian anticyclone BAII. Circulation and interaction with the zonal jets Authors: Santiago Pérez-Hoyos,Agustín Sánchez-Lavega,Jon Legarreta,E. Garcı´a-Melendo,Ricardo Hueso Abstract In this second part of our study of the large jovian anticyclone BA we present detailed measurements of its internal circulation and numerical models of its interaction with the zonal jets and nearby cyclonic regions. We characterized the flow using high-resolution observations obtained… Elsevier BV	2009-10-01
Evolution of the cloud field and wind structure of Jupiter's highest speed jet during a huge disturbance Authors: Agustín Sánchez-Lavega,Enrique Garcia-Melendo,N. Barrado-Izagirre,Santiago Pérez-Hoyos Aims. Despite the banded visual aspect of cloud patterns in Jupiter, high resolution images indicate that these regions are markedly turbulent. One region of particular interest is the north temperate belt (NTB) at 21 ◦ N planetocentric latitude, where the most intense Jovian jet resides with… EDP Sciences	2009-09-03
Mining probabilistic models learned by EDAs in the optimization of multi-objective problems Authors: Jose A. Lozano,Pedro Larrañaga,Roberto Santana,Concha Bielza One of the uses of the probabilistic models learned by estimation of distribution algorithms is to reveal previous unknown information about the problem structure. In this paper we investigate the mapping between the problem structure and the dependencies captured in the probabilistic models… ACM	2009-07-08
Gravity waves in Jupiter's equatorial clouds observed by the Galileo orbiter Authors: Ricardo Hueso,J. Arregi,Agustín Sánchez-Lavega,Jose Félix Rojas A reanalysis of Galileo images of Jupiter's Equatorial Zone obtained in 1999 and 2001 reveals the presence of trains of cloud bands, probably generated by gravity waves, similar to those seen in Voyager 1 and 2 (1979) and New Horizons (2007) images. No such waves have been found in a similar… Elsevier BV	2009-07-01
Brightness power spectral distribution and waves in Jupiter's upper cloud and hazes Authors: Santiago Pérez-Hoyos,Agustín Sánchez-Lavega,N. Barrado-Izagirre In this work we analyze the spatial structure of Jupiter's cloud reflectivity field in order to determine brightness periodicities and power spectra characteristics together with their relationship with Jupiter's dynamics and turbulence. The research is based on images obtained in the near-infrared… Elsevier BV	2009-07-01
Assessment of HRQoL in patients with eating disorders by the beta‐binomial regression approach Authors: Angel Padierna,Inmaculada Arostegui,José M. Quintana AbstractObjective:To study the influence of clinical variables on health‐related quality of life (HRQoL) among women with eating disorder (ED) using beta‐binomial regression (BBR) to analyze scores on the Short‐Form 36 (SF‐36) as dependent variable.Method:Female patients diagnosed with ED completed… Wiley	2009-06-17
Wiener filter-based fixed-complexity vector precoding for the MIMO downlink channel Authors: John S. Thompson,Maitane Barrenechea,J. Del Ser,Mikel Mendicute A fixed-throughput Wiener filter vector precoding (VP) approach specially suitable for hardware implementation in field programable gate array (FPGA) devices is introduced in this paper. The lattice decoding algorithm, which is based on the sphere decoder (SD) lattice search, performs in its first… IEEE	2009-06-01
Vertical shears in Saturn's eastward jets at cloud level Authors: Ricardo Hueso,Enrique Garcia-Melendo,Agustín Sánchez-Lavega,Jose Félix Rojas,Santiago Pérez-Hoyos We have measured the vertical shear of the zonal winds in the cloud-haze upper layer of Saturn using Cassini ISS images obtained in the filters MT2 (753 nm methane absorption band, sensitive to the upper haze) and CB2 (adjacent continuum, sensitive to the lower cloud). Our radiative transfer models… Elsevier BV	2009-06-01
Design, simulation and hardware validation of a low-cost CLMS echo canceling system Authors: Javier Del Ser,Mikel Sanchez,Pablo Prieto,Mikel Mendicute This paper presents the design, simulation and performance of a low-cost echo canceler for its application to on-channel repeaters in single frequency DVB-T networks. In these devices an echo canceler is required in order to avoid the coupling echoes produced between transmission and reception… IEEE	2009-06-01
Computational semantic analysis of language: SemEval-2007 and beyond Authors: Lluís Màrquez,Eneko Agirre,Richard Wicentowski SemEval-2007, the Fourth International Workshop on Semantic Evaluations (Agirre et al. 2007) took place on June 23-24, 2007, as a co-located event with the 45th Annual Meeting of the ACL. It was the fourth semantic evaluation exercise, continuing on from the series of successful Senseval workshops… Springer Science and Business Media LLC	2009-05-14
A new preprocessing procedure for the haplotype inference problem Authors: Jose A. Lozano,Ekhine Irurozki A haplotype is a DNA sequence that is inherited from one parent. They are especially important in the study of complex diseases since they contain more information than genotype data, so the next high priority phase in human genomics involves the development of a full Haplotype Map of human genome… IEEE	2009-05-01
Analyzing the probability of the optimum in EDAs based on Bayesian networks Authors: Jose A. Lozano,Alexander Mendiburu,Carlos Echegoyen,Roberto Santana In this paper we quantitatively analyze the probability distributions generated by an EDA during the search. In particular, we record the probabilities to the optimal solution, the solution with the highest probability and that of the best individual of the population, when the EDA is solving a… IEEE	2009-05-01
Performance evaluation of H.264/MPEG-4 Scalable Video Coding over IEEE 802.16e networks Authors: Jon Casasempere,Pedro Sanchez,Tomas Villameriel,Javier Del Ser This work considers the transmission of multimedia streams over broadband networks using the latest video coding standard H.264/SVC. The Scalable Video Coding for Heterogeneous Media Delivery allows temporal, spatial and SNR scalability in video flows, adapting and optimizing the quality of the… IEEE	2009-05-01
A comparison of generalized hybrid Monte Carlo methods with and without momentum flip Authors: Akhmatskaya, Elena,Bou-Rabee, Nawaf,Reich, Sebastian The generalized hybrid Monte Carlo (GHMC) method combines Metropolis corrected constant energy simulations with a partial random refreshment step in the particle momenta. The standard detailed balance condition requires that momenta are negated upon rejection of a molecular dynamics proposal step.… Elsevier BV	2009-04-01
Weak Dispersive Estimates for Schrödinger Equations with Long Range Potentials Authors: Luis Vega,Alberto Ruiz,Juan Antonio Barceló,M. C. Vilela We prove some local smoothing estimates for the Schr��dinger initial value problem with data in $L^2(\mathbb{R}^d)$, $d \geq 2$ and a general class of potentials. In the repulsive setting we have to assume just a power like decay $(1+\|x\|)^{-��}$ for some $��>0$. Also attractive perturbations are… Informa UK Limited	2009-03-05
A Low-Cost FPGA-Based Embedded Fingerprint Verification and Matching System Authors: Maitane Barrenechea,Jon Altuna,Mikel Mendicute,Javier Del Ser Springer Netherlands	2009-02-17
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