Publications

Displaying 976 - 1000 of 1307

Publication	Date
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
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
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
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
Parallel multi-frontal solver for p adaptive finite element modeling of multi-physics computational problems Authors: Anna Paszyńska,Maciej Paszyński,David Pardo The paper presents a parallel direct solver for multi-physics problems. The solver is dedicated for solving problems resulting from adaptive finite element method computations. The concept of finite element is actually replaced by the concept of the node. The computational mesh consists of several… Elsevier BV	2010-05-01
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: David Pardo AbstractWe 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… Elsevier BV	2010-05-01
Parallel multi-frontal solver for multi-physics p adaptive problems Authors: Anna Paszyńska,Maciej Paszyński,David Pardo AbstractThe paper presents a parallel direct solver for multi-physics problems. The solver is dedicated for solving problems resulting from adaptive Finite Element Method computations. The concept of finite element is actually replaced by the concept of the node. The computational mesh consists of… Elsevier BV	2010-05-01
Design and implementation of a direct RF-to-digital UHF-TV multichannel transceiver Authors: David Dominguez,Javier Del Ser,Mikel Sanchez,Pablo Prieto This manuscript presents the design and implementation of a direct UHF digital transceiver that provides direct sampling of the UHF-TV input signal spectrum. Our SDR-based approach is based on a pair of high-speed ADC/DAC devices along with a channelizer, a dechannelizer and a channel management… IEEE	2010-05-01
Agent-based computing, adaptive algorithms and bio computing Authors: Tibor Bosse,Krzysztof Centarowicz,Han La Poutré,David Pardo,Maciej Paszyński AbstractAgent-oriented system seems to be the attractive tool useful for numerous domains of applications. It gives the ability to integrate results of different domains of computer science and constitutes the powerful tool for solving various problems. The new approach to the simulation… Elsevier BV	2010-05-01
Endpoint Strichartz estimates for the magnetic Schrödinger equation Authors: D'ANCONA, Piero Antonio,FANELLI, Luca,Luis Vega,Nicola Visciglia 11 pages 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
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: Paszyński, Maciej R.,Pardo, David,Torres-Verdín, Carlos,Demkowicz, Leszek F.,Calo, Victor M. 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
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
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
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
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
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