Publications

Displaying 901 - 925 of 1307

Publication	Date
A survey on direct solvers for Galerkin methods Authors: Julen Alvarez,Nathan Collier,David Pardo,David Pardo,Maciej Paszyński,Lisandro Dalcin,Victor M. Calo In this paper we describe the history, performance, and design concepts of direct solvers for algebraic systems resulting from Galerkin discretizations of partial differential equations. Popular direct solver implementations of Gaussian elimination (also known as LU factorization) are introduced… Springer Science and Business Media LLC	2012-01-01
Climate Change and Tourism in the Alps: A Position Paper in View of the Upcoming Alpine Convention Fourth Report on the State of the Alps on Sustainable Tourism Authors: Stefano Balbi Whereas the implementation of the Tourism Protocol of the Alpine Convention seems far from its completion, the Alpine Convention fourth report on the state of the Alps "Sustainable Tourism in the Alps" is under preparation and it is expected by the end of 2012. One of the main critical challenges… Elsevier BV	2012-01-01
The 2009–2010 fade of Jupiter’s South Equatorial Belt: Vertical cloud structure models and zonal winds from visible imaging Authors: Jose Félix Rojas,Agustín Sánchez-Lavega,Santiago Pérez-Hoyos,J. F. Sanz-Requena,N. Barrado-Izagirre Abstract The South Equatorial Belt (SEB) of Jupiter is known to alternate its appearance at visible wavelengths from a classical belt-like band most of the time to a short-lived zone-like aspect which is called a “fade” of the belt, hereafter SEBF. The albedo change of the SEB is due to a change… Elsevier BV	2012-01-01
hp-HGS strategy for inverse 3D DC resistivity logging measurement simulations Authors: Victor M. Calo,Ewa Gajda-Zaǵorska,David Pardo,Robert Schaefer,Maciej Paszýnski AbstractIn this paper we present a twin adaptive strategy hp-HGS for solving inverse problems related to 3D DC borehole resistivity measurement simulations. The term “simulation of measurements” is widely used by the geophysical community. A quantity of interest, voltage, is measured at a receiver… Elsevier BV	2012-01-01
A Conceptual Framework for Comprehensive Assessment of Risk Prevention Measures: The Kulturisk Framework (KR-FWK) Authors: Stefano Balbi,Vahid Mojtahed,Animesh K. Gain,Valentina Gallina,Silvia Torresan,Carlo Giupponi,Antonio Marcomini A conceptual framework integrating different disciplines is described in order to provide the basis for the development of a methodology to comprehensively evaluate the benefits of risk prevention. Two main innovations are proposed with regards to the state of the art: to define a measure of risk… Elsevier BV	2012-01-01
Concurrent and Distributed Projection through Local Interference for Wireless Sensor Networks Authors: Javier Del Ser,Pedro M. Crespo,Baltasar Beferull,Xabier Insausti In this paper we use a gossip algorithm to obtain the projection of the observed signal into a subspace of lower dimension. Gossip algorithms allow distributed, fast and efficient computations on a Wireless Sensor Network and they can be properly modified to evaluate the sought projection. By… Springer Berlin Heidelberg	2012-01-01
3D hp-Adaptive Finite Element Simulations of a Magic-T Electromagnetic Waveguide Structure Authors: Sergio Llorente-Romano,David Pardo,David Pardo,Gomez-Revuelto,Luis E. Garcia-Castillo This paper employs a 3D hp self-adaptive grid-refinement finite element strategy for the solution of a particular electromagnetic waveguide structure known as Magic-T. This structure is utilized as a power divider/combiner in communication systems as well as in other applications. It often… Elsevier BV	2012-01-01
Leaf-litter decomposition in headwater streams: a comparison of the process among four climatic regions Authors: Pozo, Jesús,Casas, Jesús,Menéndez, Margarita,Mollá, Salvador,Arostegui, Inmaculada,Basaguren, Ana,Casado, Carmen,Descals, Enrique,García Avilés, Javier,González, José M.,Larrañaga, Aitor,López, Enrique,Lusi, Miriam,Moya, Óscar,Pérez, Javier,Riera, Tecla,… The main purpose of our work was to elucidate factors responsible for the geographical differences in leaf-litter decomposition rates in Spanish oligotrophic headwater streams. Decomposition experiments with alder (Alnus glutinosa) leaf litter were carried out in 22 headwater streams in 4 different… University of Chicago Press	2011-12-01
The IRYSS-COPD appropriateness study: objectives, methodology, and description of the prospective cohort Authors: Quintana López, José María,Esteban, Cristóbal,Barrio Beraza, Irantzu,García Gutiérrez, Susana,González, Nerea,Arostegui Madariaga, Inmaculada,Lafuente Guerrero, Iratxe,Baré Mañas, Marisa,Blasco, Juan Antonio,Vidal, Silvia,IRYSS-COPD Group Patients with chronic obstructive pulmonary disease (COPD) often experience exacerbations of the disease that require hospitalization. Current guidelines offer little guidance for identifying patients whose clinical situation is appropriate for admission to the hospital, and properly developed and… Springer Science and Business Media LLC	2011-11-24
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 M.,Mustonen M.,Rauma T.,Del Ser J. 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
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… International audience 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,… International audience 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: Marja Matinmikko,Javier Del Ser,Miren Nekane Bilbao,Sancho Salcedo-Sanz,Sergio Gil-Lopez 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