Publications

Displaying 926 - 950 of 1227

Publication	Date
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
Multigoal-oriented adaptivity for hp-finite element methods Authors: Pardo, D. We extend an existing self-adaptive goal-oriented hp-adaptive Finite Element (FE) strategy to the case of multiple goals. The main idea of this extension is to design a new “quantity of interest” based on the solution of the direct problem and the given multiple goals. We describe an efficient… Elsevier BV	2010-05-01
ECG spectral and morphological parameters reviewed and updated to detect adult and paediatric life-threatening arrhythmia Authors: Elisabete Aramendi,E. Pastor,F. Benito,Unai Irusta,A. Bodegas Since the International Liaison Committee on Resuscitation approved the use of automated external defibrillators (AEDs) in children, efforts have been made to adapt AED algorithms designed for adult patients to detect paediatric ventricular arrhythmias accurately. In this study, we assess the… IOP Publishing	2010-04-22
Turbo joint source-channel coding of non-uniform memoryless sources in the bandwidth-limited regime Authors: Mikel Hernaez,Idoia Ochoa,J. Del Ser,Pedro M. Crespo This letter proposes a novel one-layer coding/ shaping scheme with single-level codes and sigma-mapping for the bandwidth-limited regime. Specifically, we consider nonuniform memoryless sources sent over AWGN channels. At the transmitter, binary data are encoded by a Turbo code composed of two… Institute of Electrical and Electronics Engineers (IEEE)	2010-04-01
Erratum to "serially-concatenated LDGM codes for correlated sources over Gaussian broadcast channels" Authors: Javier Del Ser,Mikel Hernaez,Pedro M. Crespo,Javier Garcia-Frias Erratum to "serially-concatenated LDGM codes for correlated sources over Gaussian broadcast channels" Institute of Electrical and Electronics Engineers (IEEE)	2010-03-01
Simulation of eccentricity effects on short- and long-normal logging measurements using a Fourier-hp-finite-element method Authors: Seho Hwang,Changhyun Lee,Myung Jin Nam,Kwon Gyu Park,Carlos Torres-Verdín,David Pardo,David Pardo Resistivity logging instruments are designed to measure the electrical resistivity of a formation, and this can be directly interpreted to provide a water-saturation profile. However, resistivity logs are sensitive to borehole and shoulder- bed effects, which often result in misinterpretation of… Informa UK Limited	2010-03-01
Sensitivity Analysis of k-Fold Cross Validation in Prediction Error Estimation Authors: Aritz Pérez,Jose A. Lozano,J.D. Rodriguez In the machine learning field, the performance of a classifier is usually measured in terms of prediction error. In most real-world problems, the error cannot be exactly calculated and it must be estimated. Therefore, it is important to choose an appropriate estimator of the error. This paper… Institute of Electrical and Electronics Engineers (IEEE)	2010-03-01
A parallel direct solver for the self-adaptive hp Finite Element Method Authors: Maciej Paszyński,Carlos Torres-Verdín,David Pardo,Victor M. Calo,Leszek Demkowicz In this paper we present a new parallel multi-frontal direct solver, dedicated for the hp Finite Element Method (hp-FEM). The self-adaptive hp-FEM generates in a fully automatic mode, a sequence of hp-meshes delivering exponential convergence of the error with respect to the number of degrees of… Elsevier BV	2010-03-01
On the design of frequency-switching patterns for distributed data fusion over relay networks Authors: Pedro M. Crespo,Javier Del Ser,Sergio Gil-Lopez,Ignacio Olabarrieta Recent contributions have shown that, by switching frequency bands at intermediate relay nodes, enhanced diversity can be attained in two-user wireless frequency division relay networks at a minimum computational cost. This paper elaborates on the design of frequency-switching patterns for more… IEEE	2010-02-01
Enhanced sensing error probability estimation for iterative data fusion in the low SNR regime Authors: Javier Del Ser,Ignacio Olabarrieta In this paper we consider a network of distributed sensors which simultaneously measure a physical parameter of interest, subject to a certain probability of sensing error. The sensed information at each of such nodes is channel-encoded and forwarded to a central receiver through parallel… IEEE	2010-02-01
MHC class II DRB1 gene polymorphism in the pathogenesis of Maedi–Visna and pulmonary adenocarcinoma viral diseases in sheep Authors: Amaia Larruskain,E. Minguijón,Inmaculada Arostegui,Ramón A. Juste,Bernardino Moreno,Begoña M. Jugo,Koldo Garcia-Etxebarria Ovine pulmonary adenocarcinoma (OPA) and Maedi-Visna (Maedi) are two chronic respiratory diseases of retroviral origin which occur worldwide. It is known that different host genetic factors influence the outcome of viral infections. To determine if variation in the Mhc-DRB1 gene was associated with… Springer Science and Business Media LLC	2010-01-05
On the Application of a Novel Grouping Harmony Search Algorithm to the Switch Location Problem Authors: Javier Del Ser,Laura Garcia-Padrones,Sergio Gil-Lopez,Jose A. Portilla-Figueras,Sancho Salcedo-Sanz,Itziar Landa This paper presents the adaptation of a novel heuristic algorithm to the Switch Location Problem (SLP), a NP-hard problem where a set of distributed terminals, with distinct rate demands, is to be assigned to a fixed number of concentrators subject to capacity constraints. Each terminal must be… Springer Berlin Heidelberg	2010-01-01
Fish recruitment prediction, using robust supervised classification methods Authors: Fernandes, J.A. (Jose A.),Irigoien, X. (Xabier),Goikoetxea, N.,Lozano, J.A.,Inzab, I.,Pérez, A.,Bode, A. (Antonio) Improving our ability to predict recruitment is a key element in fisheries management. However, the interactions between population dynamics and different environmental factors are complex and often non-linear, making it difficult to produce robust predictions. ‘Machine-learning’ techniques (in… Elsevier BV	2010-01-01
Arithmetic Method of Double-Injection-Electrode Model for Resistivity Measurement Through Metal Casing Authors: Chen, Q.,Pardo, D.,Li, H.-B.,Wang, F.-R.,Ye, Q.-Z. Through-casing resistivity (TCR) measurement instruments such as Cased Hole Formation Resistivity are extensively used for the dynamic monitoring of oil reservoirs during the production phase in oil wells to evaluate the residual oil distribution. However, two shortcomings still exist in the common… Institute of Electrical and Electronics Engineers (IEEE)	2010-01-01
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
On the Performance of Single LDGM Codes for Iterative Data Fusion over the Multiple Access Channel Authors: Javier Garcia-Frias,Pedro M. Crespo,Diana Manjarres,Javier Del Ser,Ignacio Olabarrieta One of the applications of wireless sensor networks currently undergoing active research focuses on the scenario where the information generated by a data source S is simultaneously sensed by N nodes and therefrom transmitted to a common receiver. Based on the received information from such N nodes… Springer Berlin Heidelberg	2010-01-01
Dynamics and Clouds in Jupiter Equatorial Zone Authors: A. Sánchez-Lavega,Ricardo Hueso,Jose Félix Rojas,J. Arregi In this work we show a study of the dynamics and clouds in the equatorial zone of Jupiter. The studied area is wider than the pure Equatorial Zone ranging from the southern limit of the South Equatorial Belt (SEB) to the northern limit of the North Equatorial Belt (NEB). We have used images from… Springer Berlin Heidelberg	2010-01-01
Elhuyar-IXA: Semantic Relatedness and Cross-Lingual Passage Retrieval Authors: Olatz Ansa,Eneko Agirre,Xabier Saralegi,Hugo Zaragoza,Xabier Arregi,Maddalen Lopez de Lacalle,Arantxa Otegi This article describes the participation of the joint Elhuyar-IXA group in the ResPubliQA exercise at QA&CLEF. In particular, we participated in the English-English monolingual task and in the Basque-English crosslingual one. Our focus has been threefold: (1) to check to what extent information… Springer Berlin Heidelberg	2010-01-01
Strategies to Map Parallel Applications onto Meshes Authors: Jose A. Lozano,Jose Miguel-Alonso,Jose Antonio Pascual The optimal mapping of tasks of a parallel program onto nodes of a parallel computing system has a remarkable impact on application performance. We propose a new criterion to solve the mapping problem in 2D and 3D meshes that uses the communication matrix of the application and a cost matrix that… Springer Berlin Heidelberg	2010-01-01
Venus Spectrophotometry During the MESSENGER Mission Fly-By Authors: William E. McClintock,Ricardo Hueso,Javier Peralta,Gregory M. Holsclaw,Agustín Sánchez-Lavega,Santiago Pérez-Hoyos The NASA mission MESSENGER fly-byed planet Venus on June 2007 on its route to Mercury. This chance was took to produce coordinated observations between Messenger and ESA Venus Express spacecrafts. This work shows spectra in the wavelength range between 320 and 1450nm retrieved with the instrument… Springer Berlin Heidelberg	2010-01-01
A Review on Parallel Estimation of Distribution Algorithms Authors: Alexander Mendiburu,Jose Miguel-Alonso,Jose A. Lozano Estimation of Distribution Algorithms (EDAs) are a set of techniques that belong to the field of Evolutionary Computation. They are similar to Genetic Algorithms (GAs), in the sense that, given a problem, they use a population of individuals to represent solutions, and this population is made to… Springer Berlin Heidelberg	2010-01-01
Harmony Search Heuristics for Quasi-asynchronous CDMA Detection with M-PAM Signalling Authors: Laura Garcia-Padrones,Sergio Gil-Lopez,J. Del Ser Focusing on CDMA (Code Division Multiple Access) uplink communications, this paper addresses the application of heuristic techniques to the multiple user detection problem when dealing with asynchrony between transmitters and bandwidth-limited PAM (Pulse Amplitude Modulation) signals. In such… Springer Berlin Heidelberg	2010-01-01
Erratum to “A comparison of generalized hybrid Monte Carlo methods with and without momentum flip” [J. Comput. Phys. 228 (2009) 2256–2265] Authors: Elena Akhmatskaya,Nawaf Bou-Rabee,Sebastian Reich 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
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
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