Publications

Displaying 776 - 800 of 1351

Publication	Date
Extending distance-based ranking models in estimation of distribution algorithms Authors: Josu Ceberio,Jose A. Lozano,Alexander Mendiburu,Ekhine Irurozki Recently, probability models on rankings have been proposed in the field of estimation of distribution algorithms in order to solve permutation-based combinatorial optimisation problems. Particularly, distance-based ranking models, such as Mallows and Generalized Mallows under the Kendall's-τ… IEEE	2014-07-01
Numerical Regge pole analysis of resonance structures in elastic, inelastic and reactive state-to-state integral cross sections Authors: Elena Akhmatskaya,Elena Akhmatskaya,C. Echeverría-Arrondo,Dmitri Sokolovski,Dmitri Sokolovski We present a detailed description of a FORTRAN code for evaluation of the resonance contribution a Regge trajectory makes to the integral state-to-state cross section (ICS) within a specified range of energies. The contribution is evaluated with the help of the Mulholland formula [Macek et al (2004… Elsevier BV	2014-07-01
Automatic detection of chest compressions for the assessment of CPR-quality parameters Authors: Jo Kramer-Johansen,Elisabete Aramendi,Unai Ayala,Unai Ayala,Erik Alonso,S. Wali,Unai Irusta,Trygve Eftestøl Accurate chest compression detection is key to evaluate cardiopulmonary resuscitation (CPR) quality. Two automatic compression detectors were developed, for the compression depth (CD), and for the thoracic impedance (TI). The objective was to evaluate their accuracy for compression detection and… Elsevier BV	2014-07-01
A daylight experiment for teaching stellar interferometry Authors: Agustín Sánchez-Lavega,Ricardo Hueso,Gotzon Aldabaldetreku,Gaizka Durana,Joseba Zubia,María Asunción Illarramendi We discuss the design of a simple experiment that reproduces the operation of the Michelson stellar interferometer. The emission of stellar sources has been simulated using light emerging from circular end-faces of step-index polymer optical fibers and from diffuse reflections of laser beams.… American Association of Physics Teachers (AAPT)	2014-07-01
Retrieval of orbital parameters of the Galilean satellites using small telescopes Authors: Iñaki Ordóñez Etxeberria,Agustín Sánchez-Lavega,Teresa del Río-Gaztelurrutia The orbital motion of Jupiterʼs Galilean satellites can be studied using the medium-sized telescopes commonly found in college or school observatories. In this paper we show how it is possible to deduce the parameters of their orbits around Jupiter using a small number of well-planed observations.… IOP Publishing	2014-06-05
Subtypes of Patients Experiencing Exacerbations of COPD and Associations with Outcomes Authors: Arostegui, Inmaculada,Esteban, Cristobal,Garcia-Gutierrez, Susana,Baré i Mañas, Marisa,Fernández de Larrea, Nerea,Briones, Eduardo,Quintana López, José María,Universitat Autònoma de Barcelona. Departament de Pediatria, d'Obstetrícia i Ginecologia i… Chronic obstructive pulmonary disease (COPD) is a complex and heterogeneous condition characterized by occasional exacerbations. Identifying clinical subtypes among patients experiencing COPD exacerbations (ECOPD) could help better understand the pathophysiologic mechanisms involved in… Public Library of Science (PLoS)	2014-06-03
Computational cost estimates for parallel shared memory isogeometric multi-frontal solvers Authors: Wozniak, M.,Kuznik, K.,Paszynski, M.,Calo, Victor,Pardo, D. In this paper we present computational cost estimates for parallel shared memory isogeometric multi-frontal solvers. The estimates show that the ideal isogeometric shared memory parallel direct solver scales as $\mathcal{O}( p^2log(N/p))$ for one dimensional problems, $\mathcal{O}(Np^2)$ for two… Elsevier BV	2014-06-01
Glory revealed in disk-integrated photometry of Venus Authors: A. García Muñoz,Agustín Sánchez-Lavega,Santiago Pérez-Hoyos Context. Reflected light from a spatially unresolved planet yields unique insight into the overall optical properties of the planet cover. Glories are optical phenomena caused by light that is backscattered within spherical droplets following a narrow distribution of sizes; they are well known on… EDP Sciences	2014-06-01
Range-free localization algorithm based on connectivity and motion Authors: José Luis Ortega Martín,Javier Del Ser,Ignacio Olabarrieta,Sergio Gil-Lopez,José María Cabero Information about the position of entities is very valuable in many fields. People, animals, robots and sensors are some examples of entities that have been targeted as nodes of interest for localization purposes. Technical advances in ubiquitous computing and wireless communications properties are… Springer Science and Business Media LLC	2014-05-25
Standardised and transparent model descriptions for agent-based models: Current status and prospects Authors: Birgit Müller,Stefano Balbi,Carsten M. Buchmann,Luís de Sousa,Gunnar Dressler,Jürgen Groeneveld,Christian J. Klassert,Quang Bao Le,James D.A. Millington,Henning Nolzen,Dawn C. Parker,J. Gary Polhill,Maja Schlüter,Jule Schulze,Nina Schwarz,Zhanli Sun,… Agent-based models are helpful to investigate complex dynamics in coupled human-natural systems. However, model assessment, model comparison and replication are hampered to a large extent by a lack of transparency and comprehensibility in model descriptions. In this article we address the question… Elsevier BV	2014-05-01
Application-aware metrics for partition selection in cube-shaped topologies Authors: Jose A. Lozano,Jose Miguel-Alonso,Jose Antonio Pascual Abstract Non-contiguous partitioning strategies are often used to select and assign a set of nodes of a parallel computer to a particular job. The main advantage of these strategies, compared to contiguous ones, is the reduction of system fragmentation. However, without contiguity, locality in… Elsevier BV	2014-05-01
Can thoracic impedance monitor the depth of chest compressions during out-of-hospital cardiopulmonary resuscitation? Authors: Jesus Ruiz,Elisabete Aramendi,Erik Alonso,Mohamud Daya,James K. Russell,Digna M. González-Otero,Sofía Ruiz de Gauna,Unai Ayala To analyze the relationship between the depth of the chest compressions and the fluctuation caused in the thoracic impedance (TI) signal in out-of-hospital cardiac arrest (OHCA). The ultimate goal was to evaluate whether it is possible to identify compressions with inadequate depth using… Elsevier BV	2014-05-01
Compact and Fast Fault Injection System for Robustness Measurements on SRAM-Based FPGAs Authors: Mikel Garay,Jaime Jiménez,Armando Astarloa,Uli Kretzschmar,Javier Del Ser Developing safety-aware designs on field programmable gate arrays (FPGA) directly feeds a demand for error emulation techniques. Since for SRAM-based FPGA single event upsets (SEU) are the most important concern, error testing is usually executed using error injection into the configuration memory… Institute of Electrical and Electronics Engineers (IEEE)	2014-05-01
Predictive score for mortality in patients with COPD exacerbations attending hospital emergency departments Authors: Quintana, José María,Esteban, Cristóbal,Unzurrunzaga, Anette,García Gutiérrez, Susana,González, Nerea,Barrio, Irantzu,Arostegui, Inmaculada,Lafuente, Iratxe,Baré, Marisa,Fernández de Larrea-Baz, Nerea,Vidal, Silvia,Estirado Vera, Cristina, 1968-,Gea… Limited information is available about predictors of short-term outcomes in patients with exacerbation of chronic obstructive pulmonary disease (eCOPD) attending an emergency department (ED). Such information could help stratify these patients and guide medical decision-making. The aim of this… Springer Science and Business Media LLC	2014-04-23
A Distance-Based Ranking Model Estimation of Distribution Algorithm for the Flowshop Scheduling Problem Authors: Alexander Mendiburu,Josu Ceberio,Ekhine Irurozki,Jose A. Lozano The aim of this paper is two-fold. First, we introduce a novel general estimation of distribution algorithm to deal with permutation-based optimization problems. The algorithm is based on the use of a probabilistic model for permutations called the generalized Mallows model. In order to prove the… Institute of Electrical and Electronics Engineers (IEEE)	2014-04-01
The long‐term steady motion of Saturn's hexagon and the stability of its enclosed jet stream under seasonal changes Authors: Sánchez-Lavega, A.,del Río-Gaztelurrutia, T.,Hueso, R.,Pérez-Hoyos, S.,García-Melendo, E.,Antuñano, A.,Mendikoa, I.,Rojas, J. F.,Lillo, J.,Barrado-Navascués, D.,Gomez-Forrellad, J. M.,Go, C.,Peach, D.,Barry, T.,Milika, D. P.,Nicholas, P.,Wesley, A.,Team… AbstractWe investigate the long‐term motion of Saturn's north pole hexagon and the structure of its associated eastward jet, using Cassini imaging science system and ground‐based images from 2008 to 2014. We show that both are persistent features that have survived the long polar night, the jet… American Geophysical Union (AGU)	2014-03-07
A novel multi-objective algorithm for the optimal placement of wind turbines with cost and yield production criteria Authors: Itziar Landa-Torres,Sergio Gil-Lopez,Valentin Sanchez,Diana Manjarres,Javier Del Ser,Nicolaz Guidon,Naima Vande Walle During the last years wind energy has experimented a significant growth in comparison with other types of renewable energy sources. Accordingly, the number of wind farms has increased sharply to become one of the most developed worldwide infrastructures. Unfortunately, the high number of… IEEE	2014-03-01
3D hp-adaptive finite element simulations of bend, step, and magic-T electromagnetic waveguide structures Authors: Sergio Llorente-Romano,David Pardo,David Pardo,Ignacio Gomez-Revuelto,Luis E. Garcia-Castillo Metallic rectangular waveguides are often the preferred choice on telecommunication systems and medical equipment working on the upper microwave and millimeter wave frequency bands due to the simplicity of its geometry, low losses, and the capacity to handle high powers. Waveguide translational… Elsevier BV	2014-03-01
Random Walks for Knowledge-Based Word Sense Disambiguation Authors: Eneko Agirre,Aitor Soroa,Oier Lopez de Lacalle Word Sense Disambiguation (WSD) systems automatically choose the intended meaning of a word in context. In this article we present a WSD algorithm based on random walks over large Lexical Knowledge Bases (LKB). We show that our algorithm performs better than other graph-based methods when run on a… MIT Press - Journals	2014-03-01
On the fatigue behavior of support structures for offshore wind turbines Authors: Alati N.,Nava V.,Failla G.,Arena F.,Santini A. It is believed that offshore wind farms may satisfy an increasing portion of the energy demand in the next years. This paper presents a comparative study of the fatigue performances of tripod and jacket steel support structures for offshore wind turbines in waters of intermediate depth (20-50 m). A… Techno-Press	2014-02-25
A fast implementation of the first fit contiguous partitioning strategy for cubic topologies Authors: Jose A. Lozano,Jose Miguel-Alonso,Jose Antonio Pascual SUMMARYIn this paper, we propose and evaluate improved first fit (IFF), a fast implementation of the first fit contiguous partitioning strategy. It has been devised to accelerate the process of finding contiguous partitions in space‐shared parallel computers in which the nodes are arranged forming… Wiley	2014-02-12
Influence of changes in physical activity on frequency of hospitalization in chronic obstructive pulmonary disease Authors: Susana Aizpiri,José M. Quintana,Inmaculada Arostegui,Myriam Aburto,Luis V. Basualdo,Alberto Capelastegui,Javier Moraza,Cristóbal Esteban AbstractBackground and objectiveTo evaluate whether changes in regular physical activity (PA) in patients with chronic obstructive pulmonary disease (COPD) affect the rate of hospitalizations for COPD exacerbation (eCOPD).MethodsFive hundred forty‐three ambulatory clinic patients being treated for… Wiley	2014-02-02
Assisting in search heuristics selection through multidimensional supervised classification: A case study on software testing Authors: Alexander Mendiburu,Jose A. Lozano,Iñaki Inza,Ramón Sagarna A fundamental question in the field of approximation algorithms, for a given problem instance, is the selection of the best (or a suitable) algorithm with regard to some performance criteria. A practical strategy for facing this problem is the application of machine learning techniques. However,… Elsevier BV	2014-02-01
Relativistic Hardy Inequalities in Magnetic Fields Authors: Nicola Visciglia,Luca Fanelli,Luis Vega,Luis Vega We deal with Dirac operators with external homogeneous magnetic fields. Hardy-type inequalities related to these operators are investigated: for a suitable class of transversal magnetic fields, we prove a Hardy inequality with the same best constant as in the free case. This leaves naturally open… Springer Science and Business Media LLC	2014-01-22
UBC entity recognition and disambiguation at ERD 2014 Authors: Ander Barrena,Eneko Agirre,Aitor Soroa This paper describes the system developed at the University of the Basque Country (UBC) for the Entity Recognition and Disambiguation Challenge (ERD 2014). We developed a single system for both long and short tracks. We implemented a very basic mention detection component and complement it with a… ACM Press	2014-01-01