Publications

Displaying 951 - 975 of 1351

Publication	Date
Scattering for 1D cubic NLS and singular vortex dynamics Authors: Valeria Banica,Luis Vega We study the stability of self-similar solutions of the binormal flow, which is a model for the dynamics of vortex filaments in fluids and super-fluids. These particular solutions \chi_a(t, x) form a family of evolving regular… European Mathematical Society - EMS - Publishing House GmbH	2011-11-16
The health, activity, dyspnea, obstruction, age, and hospitalization: Prognostic score for stable COPD patients Authors: Susana Aizpiri,Pedro Pablo España,Inmaculada Arostegui,Cristóbal Esteban,Javier Moraza,José M. Quintana,Alberto Capelastegui,Myriam Aburto Multidimensional instruments for determining the severity and prognosis of chronic obstructive pulmonary disease (COPD) must be used in daily clinical practice.To develop and validate a new COPD severity score using variables readily obtained in clinical practice and to compare its predictive… Elsevier BV	2011-11-01
A Grouping Harmony Search approach for the Citywide WiFi deployment problem Authors: Jose A. Portilla-Figueras,Javier Del Ser,Sancho Salcedo-Sanz,Itziar Landa-Torres,Diana Manjarres,Sergio Gil-Lopez This paper presents a novel Grouping Harmony Search (GHS) algorithm for the Citywide Ubiquitous WiFi Network Design problem (WIFIDP). The WIFIDP is a NP-hard problem where private customers owning wireless access points connected to Internet share bandwidth with third parties. Aspects such as… IEEE	2011-11-01
On the application of a hybrid Harmony Search algorithm to node localization in anchor-based Wireless Sensor Networks Authors: Javier Del Ser,Itziar Landa-Torres,Roberto Lopez-Valcarce,Diana Manjarres,Massimo Vecchio,Sergio Gil-Lopez In many applications based on Wireless Sensor Networks (WSNs) with static sensor nodes, the availability of accurate location information of the network nodes may become essential. The node localization problem is to estimate all the unknown node positions, based on noisy pairwise distance… IEEE	2011-11-01
Decision-making system for obtaining spectrum availability information in opportunistic networks Authors: Matinmikko, Marja,Mustonen, Miia,Rauma, Tapio,Del Ser,Javier Opportunistic networks with cognitive management systems can improve the resource use in future wireless communication networks by forming local clusters that are temporary extensions of the infrastructure and governed by the operator. This paper presents a decision making system that selects the… ACM	2011-10-26
Two birds with one stone Authors: NAVIGLI, ROBERTO,FARALLI, Stefano,Aitor Soroa,Oier De Lacalle,Eneko Agirre In this paper we present a novel approach to learning semantic models for multiple domains, which we use to categorize Wikipedia pages and to perform domain Word Sense Disambiguation (WSD). In order to learn a semantic model for each domain we first extract relevant terms from the texts in the… ACM	2011-10-24
Optimization-based mapping framework for parallel applications Authors: Pascual J.A.,Miguel-Alonso J.,Lozano J.A. Abstract The mapping of tasks of a parallel program onto nodes of a parallel computing system has a remarkable impact on application performance. In this paper we propose an optimization framework to solve the mapping problem, which takes into account the communication matrix of the application… Elsevier BV	2011-10-01
Fatigue analysis of tripods and jackets for offshore wind turbines Authors: Alati N.,Arena F.,Failla G.,Nava V. It is common understanding that large offshore wind farms may supply an increasing portion of the energy demand in the next years. To minimize the visual impact, future offshore wind energy projects are planned in deeper water than in most of the current sites. For these purposes, tripod or jacket… Informa UK Limited	2011-09-20
Uranus Pathfinder: exploring the origins and evolution of Ice Giant planets Authors: Baptiste Cecconi,Adam Masters,Adam Masters,Nicholas Achilleos,Supriya Chakrabarti,Sebastien Hess,Philippe Zarka,Christopher T. Russell,Robert Ebert,Laurent Lamy,Jared Leisner,Ravit Helled,Renée Prangé,Jaques Gustin,Martin Pätzold,Chris Paranicas,Gabriel… The "Ice Giants" Uranus and Neptune are a different class of planet compared to Jupiter and Saturn. Studying these objects is important for furthering our understanding of the formation and evolution of the planets, and unravelling the fundamental physical and chemical processes in the Solar System… Springer Science and Business Media LLC	2011-09-10
A Markovianity based optimisation algorithm Authors: Jose A. Lozano,Siddhartha Shakya,Roberto Santana Several Estimation of Distribution Algorithms (EDAs) based on Markov networks have been recently proposed. The key idea behind these EDAs was to factorise the joint probability distribution of solution variables in terms of cliques in the undirected graph. As such, they made use of the global… Springer Science and Business Media LLC	2011-09-10
A Preprocessing Procedure for Haplotype Inference by Pure Parsimony Authors: Ekhine Irurozki,Borja Calvo,Jose A. Lozano Haplotype data are especially important in the study of complex diseases since it contains more information than genotype data. However, obtaining haplotype data is technically difficult and costly. Computational methods have proved to be an effective way of inferring haplotype data from genotype… Institute of Electrical and Electronics Engineers (IEEE)	2011-09-01
Saturn’s zonal wind profile in 2004–2009 from Cassini ISS images and its long-term variability Authors: Agustín Sánchez-Lavega,Ricardo Hueso,Enrique Garcia-Melendo,Santiago Pérez-Hoyos Abstract Five years of Cassini Imaging Science Subsystem images, from 2004 to 2009, are analyzed in this work to retrieve global zonal wind profiles of Saturn’s northern and southern hemispheres in the methane absorbing bands at 890 and 727 nm and in their respective adjacent continuum… Elsevier BV	2011-09-01
Hartman effect and weak measurements that are not really weak Authors: Dmitri Sokolovski,Dmitri Sokolovski,Elena Akhmatskaya We show that in wave packet tunneling, localization of the transmitted particle amounts to a quantum measurement of the delay it experiences in the barrier. With no external degree of freedom involved, the envelope of the wave packet plays the role of the initial pointer state. Under tunneling… American Physical Society (APS)	2011-08-02
Long-term evolution of the aerosol debris cloud produced by the 2009 impact on Jupiter Authors: Adam J. Burgasser,Ricardo Hueso,Santiago Pérez-Hoyos,Agustín Sánchez-Lavega,W. Golisch,R. P. Binzel,J. L. Ortiz,Paul Kalas,K. Bjorkman,Vishnu Reddy,John Clarke,David Trilling,Olivier Mousis,Enrique Garcia-Melendo,Amy A. Simon-Miller,Humberto Campins,… We present a study of the long-term evolution of the cloud of aerosols produced in the atmosphere of Jupiter by the impact of an object on 19 July 2009. The work is based on images obtained during 5 months from the impact to 31 December 2009 taken in visible continuum wavelengths and from 20 July… Elsevier BV	2011-08-01
Classification of resonance Regge trajectories and a modified Mulholland formula Authors: Dmitri Sokolovski,Dmitri Sokolovski,Elena Akhmatskaya,Elena Akhmatskaya We employ a simple potential model to analyse the effects which a Regge trajectory, correlating with a bound or a metastable state at zero angular momentum, has on an integral cross section. A straightforward modification of the Mulholland formula of Macek et al is proposed for more efficient… Elsevier BV	2011-08-01
Compensation effect analysis in DIE method for through-casing measuring formation resistivity Authors: Qing, C.,Pardo, D.,Hong-bin, L.,Fu-rong, W. The measuring technique based on Double-Injection-Electrodes (DIE) and its compensation arithmetic method have been proven to be very useful for eliminating the errors caused by electrode-scale mechanical tolerances in formation resistivity measurement through metal case. In this paper, we found… Elsevier BV	2011-08-01
Iterative power and subcarrier allocation in rate-constrained orthogonal multicarrier downlink systems based on hybrid harmony search heuristics Authors: Del Ser, Javier,Bilbao, Mirren Nekane,Gil-López, Sergio,Matinmikko, Marja,Salcedo-Sanz,Sancho This paper presents a novel iterative hybrid algorithm for subcarrier and power allocation in a cognitive orthogonal frequency division multiple access (OFDMA) downlink. In the considered setup a primary base station forwards information to K distant receivers by using a single OFDM waveform,… Elsevier BV	2011-08-01
A preliminary study on EDAs for permutation problems based on marginal-based models Authors: Alexander Mendiburu,Jose A. Lozano,Josu Ceberio Estimation of Distribution Algorithms are a class of evolutionary algorithms characterized by the use of probabilistic models. These algorithms have been applied successfully to a wide set of artificial and real-world problems, achieving competitive results in most scenarios. Nevertheless, there… ACM	2011-07-12
Deep winds beneath Saturn’s upper clouds from a seasonal long-lived planetary-scale storm Authors: Sánchez-Lavega, A.,del Río-Gaztelurrutia, T.,Hueso, R.,Gómez-Forrellad, J. M.,Sanz-Requena, J. F.,Legarreta, J.,García-Melendo, E.,Colas, François,Lecacheux, Jean,Fletcher, L. N.,Barrado y Navascués, D.,Parker, D.,International Outer Planet Watch Team,… Convective storms occur regularly in Saturn's atmosphere. Huge storms known as Great White Spots, which are ten times larger than the regular storms, are rarer and occur about once per Saturnian year (29.5 Earth years). Current models propose that the outbreak of a Great White Spot is due to moist… Springer Science and Business Media LLC	2011-07-01
Simulation of wireline sonic logging measurements acquired with Borehole–Eccentered tools using a high-order adaptive finite-element method Authors: Victor M. Calo,Paweł J. Matuszyk,Carlos Torres-Verdín,Angel Mora,David Pardo,Ignacio Muga,Ignacio Muga The paper introduces a high-order, adaptive finite-element method for simulation of sonic measurements acquired with borehole-eccentered logging instruments. The resulting frequency-domain based algorithm combines a Fourier series expansion in one spatial dimension with a two-dimensional high-order… Elsevier BV	2011-07-01
Thermal Structure and Dynamics of Saturn’s Northern Springtime Disturbance Authors: Peter L. Read,A. A. Mamoutkine,Agustín Sánchez-Lavega,Gordon L. Bjoraker,Ricardo Hueso,Roger N. Clark,Teresa del Río-Gaztelurrutia,Philip D. Nicholson,Amy A. Simon-Miller,Jose M. Gomez,Christophe Sotin,Brigette E. Hesman,Kevin H. Baines,T. Momary,F.… Satellite and ground-based observations characterize a massive storm on Saturn and its effects on the atmosphere. American Association for the Advancement of Science (AAAS)	2011-06-17
On the limits of effectiveness in estimation of distribution algorithms Authors: Qingfu Zhang,Jose A. Lozano,Roberto Santana,Alexander Mendiburu,Carlos Echegoyen Which problems a search algorithm can effectively solve is a fundamental issue that plays a key role in understanding and developing algorithms. In order to study the ability limit of estimation of distribution algorithms (EDAs), this paper experimentally tests three different EDA implementations… IEEE	2011-06-01
Increasing Power of Genome-Wide Association Studies by Collecting Additional Single-Nucleotide Polymorphisms Authors: Jose A. Lozano,Eleazar Eskin,Emrah Kostem Abstract Genome-wide association studies (GWASs) have been effectively identifying the genomic regions associated with a disease trait. In a typical GWAS, an informative subset of the single-nucleotide polymorphisms (SNPs), called tag SNPs, is genotyped in case/control individuals.… Oxford University Press (OUP)	2011-06-01
Unique Continuation for Schrödinger Evolutions, with Applications to Profiles of Concentration and Traveling Waves Authors: Luis Escauriaza,Luis Vega,Gustavo Ponce,Carlos E. Kenig We prove unique continuation properties for solutions of the evolution Schr��dinger equation with time dependent potentials. As an application of our method we also obtain results concerning the possible concentration profiles of blow up solutions and the possible profiles of the traveling waves… Springer Science and Business Media LLC	2011-05-17
Development of a decision tree to assess the severity and prognosis of stable COPD Authors: Javier Moraza,Inmaculada Arostegui,Susana Aizpiri,Cristóbal Esteban,Myriam Aburto,Julio Pérez-Izquierdo,Alberto Capelastegui,José M. Quintana The aim of this study was to develop and validate a new method: a classification and regression tree (CART) based on easily accessible measures to predict mortality in patients with stable chronic obstructive pulmonary disease (COPD).This was a prospective study of two independent prospective… European Respiratory Society (ERS)	2011-05-12