Publications

Displaying 851 - 875 of 1351

Publication	Date
The Aula EspaZio Gela and the Master of Space Science and Technology in the Universidad del País Vasco (University of the Basque Country) Authors: Agustín Sánchez-Lavega,Alberto Oleaga,Santiago Pérez-Hoyos,Ricardo Hueso,Teresa del Río-Gaztelurrutia We present the Aula EspaZio Gela, a facility dedicated to teaching Space Science and Technology at the master and doctorate level at the University of the Basque Country (Spain), and to promoting the development of this field in both public and private sectors. The one-year master's degree in Space… Informa UK Limited	2013-04-22
Self-adjoint extensions of Dirac operators with Coulomb type singularity Authors: Javier Duoandikoetxea,Naiara Arrizabalaga,Luis Vega In this work we construct self-adjoint extensions of the Dirac operator associated to Hermitian matrix potentials with Coulomb decay and prove that the domain is maximal. The result is obtained by means of a Hardy-Dirac type inequality. In particular, we can work with some electromagnetic… AIP Publishing	2013-04-01
A direct solver with reutilization of LU factorizations forh-adaptive finite element grids with point singularities Authors: Paszynski, M.,Pardo, D.,Calo, Victor This paper describes a direct solver algorithm for a sequence of finite element meshes that are h-refined towards one or several point singularities. For such a sequence of grids, the solver delivers linear computational cost O(N) in terms of CPU time and memory with respect to the number of… Elsevier BV	2013-04-01
A chaotic long-lived vortex at the southern pole of Venus Authors: Garate-Lopez, I.,Hueso, R.,Sánchez-Lavega, A.,Peralta, J.,Piccioni, G.,Drossart, P. A whirling vortex has been observed in the atmosphere at the south pole of Venus. Cloud motions tracked by the Venus Express spacecraft suggest that the south polar vortex is long-lived, erratic and baroclinic in character. Springer Science and Business Media LLC	2013-03-24
Application of appropriateness criteria for hospitalization in COPD exacerbation Authors: Susana, Garcia-Gutierrez,José M, Quintana,Irantzu, Barrio,Marisa, Bare,Nerea, Fernandez,Silvia, Vidal,Nerea, Gonzalez,Iratxe, Lafuente,Edurne, Arteta,Cristóbal, Esteban,Esther, Pulido,Inmaculada, Arostegui The IRYSS-COPD appropriateness study was developed in 16 hospitals belonging to the Spanish National Health Service from June 2008 to September 2010 (n = 2,877). The objectives were to apply a set of explicit criteria for the appropriateness of hospital admission created by the RAND/UCLA… Springer Science and Business Media LLC	2013-03-19
A general framework for the statistical analysis of the sources of variance for classification error estimators Authors: Aritz Pérez,Jose A. Lozano,J.D. Rodriguez Estimating the prediction error of classifiers induced by supervised learning algorithms is important not only to predict its future error, but also to choose a classifier from a given set (model selection). If the goal is to estimate the prediction error of a particular classifier, the desired… Elsevier BV	2013-03-01
On the recoding of continuous and bounded indexes to a binomial form: an application to quality-of-life scores Authors: Vicente Núñez-Antón,José M. Quintana,Inmaculada Arostegui The statistical analysis of patient-reported outcomes (PROs) as endpoints has shown to be of great practical relevance. The resulting scores or indexes from the questionnaires used to measure PROs could be treated as continuous or ordinal. The goal of this study is to propose and evaluate a… Informa UK Limited	2013-03-01
Efficient citywide planning of open WiFi access networks using novel grouping harmony searchheuristics Authors: Jose A. Portilla-Figueras,J. Del Ser,Sergio Gil-Lopez,Itziar Landa-Torres,Sancho Salcedo-Sanz,Diana Manjarres This paper proposes the application of a novel meta-heuristic algorithm to the metropolitan wireless local area network deployment problem. In this problem, the coverage level of the deployed network must be maximized while meeting an assigned maximum budget, set beforehand. Specifically, we… Elsevier BV	2013-03-01
Influence of borehole‐eccentred tools on wireline and logging‐while‐drilling sonic logging measurements Authors: Ignacio Muga,Ignacio Muga,Paweł J. Matuszyk,Paweł J. Matuszyk,Carlos Torres-Verdín,David Pardo,Angel Mora,Victor M. Calo ABSTRACTWe describe a numerical study to quantify the influence of tool‐eccentricity on wireline (WL) and logging‐while‐drilling (LWD) sonic logging measurements. Simulations are performed with a height‐polynomial‐adaptive (hp) Fourier finite‐element method that delivers highly accurate solutions… Wiley	2013-02-13
Discrete conservation laws and the convergence of long time simulations of the mkdv equation Authors: Luis Vega,Miguel A. Alejo,Carlos Gorria Pseudospectral collocation methods and finite difference methods have been used for approximating an important family of soliton like solutions of the mKdV equation. These solutions present a structural instability which make difficult to approximate their evolution in long time intervals with… Elsevier BV	2013-02-01
Supervised pre-processing approaches in multiple class variables classification for fish recruitment forecasting Authors: Fernandes, José Antonio,Lozano, Jose A.,Iñza, Iñaki,Irigoien, Xabier,Pérez, Aritz,Rodríguez, Juan Diego A multi-species approach to fisheries management requires taking into account the interactions between species in order to improve recruitment forecasting of the fish species. Recent advances in Bayesian networks direct the learning of models with several interrelated variables to be forecasted… Elsevier BV	2013-02-01
On the design of a novel two-objective harmony search approach for distance- and connectivity-based localization in wireless sensor networks Authors: Manjarres, D.,Del Ser, J.,Gil-Lopez, S.,Vecchio, M.,Landa-Torres, I.,Salcedo-Sanz, S.,Lopez-Valcarce, R. In several wireless sensor network applications the availability of accurate nodes' location information is essential to make collected data meaningful. In this context, estimating the positions of all unknown-located nodes of the network based on noisy distance-related measurements (usually… Elsevier BV	2013-02-01
Recent Advances on Meta-Heuristics and Their Application to Real Scenarios Authors: Javier Del Ser InTech	2013-01-30
Combining stochastic and deterministic approaches within high efficiency molecular simulations Authors: Escribano, B.,Akhmatskaya, E.,Mujika, J.I. Abstract Generalized Shadow Hybrid Monte Carlo (GSHMC) is a method for molecular simulations that rigorously alternates Monte Carlo sampling from a canonical ensemble with integration of trajectories using Molecular Dynamics (MD). While conventional hybrid Monte Carlo methods… Walter de Gruyter GmbH	2013-01-29
Understanding Instance Complexity in the Linear Ordering Problem Authors: Alexander Mendiburu,Josu Ceberio,Jose A. Lozano,Leticia Hernando The Linear Ordering Problem is a combinatorial optimization problem which has been frequently addressed in the literature due to its numerous applications in diverse fields. In spite of its popularity, little is known about its complexity. In this paper we analyze the linear ordering problem trying… Springer Berlin Heidelberg	2013-01-01
Generating Customized Landscapes in Permutation-Based Combinatorial Optimization Problems Authors: Leticia Hernando,Alexander Mendiburu,Jose A. Lozano Designing customized optimization problem instances is a key issue in optimization. They can be used to tune and evaluate new algorithms, to compare several optimization algorithms, or to evaluate techniques that estimate the number of local optima of an instance. Given this relevance, several… Springer Berlin Heidelberg	2013-01-01
Simulation of borehole-eccentered triaxial induction measurements using a Fourier hp finite-element method Authors: Myung Jin Nam,Carlos Torres-Verdín,David Pardo We developed a numerical method for accurate simulation of triaxial induction measurements in the presence of borehole-eccentered logging instruments. This 3D simulation method combines a Fourier series expansion in a new system of coordinates with a 2D, goal-oriented, high-order, and self-… Society of Exploration Geophysicists	2013-01-01
Multidimensional k-Interaction Classifier: Taking Advantage of All the Information Contained in Low Order Interactions Authors: Jose A. Lozano,Iñaki Inza,Aritz Pérez Martínes This work presents a multidimensional classifier described in terms of interaction factors called multidimensional k-interaction classifier. The classifier is based on a probabilistic model composed of the product of all the interaction factors of order lower or equal to k and it takes advantage of… Springer Berlin Heidelberg	2013-01-01
Inversion of Magnetotelluric Measurements Using Multigoal Oriented hp-adaptivity Authors: Julen Álvarez-Aramberri,Hélène Barucq,Hélène Barucq,David Pardo,David Pardo AbstractThe inversion of magnetotelluric measurements require the computation of the quantity of interest (solution at the receivers) at different positions. Using a multigoal-oriented adaptive strategy for an hp Finite Element algorithm, we ensure accurate solutions in all receivers. With them,… Elsevier BV	2013-01-01
Learning from Crowds in Multi-dimensional Classification Domains Authors: Jerónimo Hernández-González,Iñaki Inza,Jose A. Lozano Learning from crowds is a recently fashioned supervised classification framework where the true/real labels of the training instances are not available. However, each instance is provided with a set of noisy class labels, each indicating the class-membership of the instance according to the… Springer Berlin Heidelberg	2013-01-01
Cost-Effectiveness Analysis for a Heavily Modified Water Body (HMWB): The Lambro-Seveso-Olona System Case Study Authors: AZZELLINO, ARIANNA,S. BALBI,D. BELLINGERI,S. CANOBBIO,CEVIRGEN, SERAP,C. GIUPPONI,V. MEZZANOTTE,A. PIANA The Lambro-Seveso-Olona system (L-S-O) is a effluent dominated watershed which derives from a strong urbanization process of natural river basins. The average population density in the L-S-O area is among the highest in Italy and Europe. Industry is also highly developed. Although at present the L-… Elsevier BV	2013-01-01
High-accuracy Adaptive Simulations of a Petri Dish Exposed to Electromagnetic Radiation Authors: Luis E. Garcia-Castillo,David Pardo,David Pardo,Ignacio Gomez-Revuelto This paper analyses numerically the electric field distribution of a liquid contained in a Petri dish when exposed to electromagnetic waves excited in a rectangular waveguide. Solutions exhibit high-gradients due to the presence of the dielectric liquid contained in the dish. Furthermore,… Elsevier BV	2013-01-01
The Cost of Continuity: Performance of Iterative Solvers on Isogeometric Finite Elements Authors: Collier, Nathan,Dalcin, Lisandro,Pardo, David,Calo, Victor M. In this paper we study how the use of a more continuous set of basis functions affects the cost of solving systems of linear equations resulting from a discretized Galerkin weak form. Specifically, we compare performance of linear solvers when discretizing using $C^0$ B-splines, which span… Society for Industrial & Applied Mathematics (SIAM)	2013-01-01
Integrated Assessment of Natural Hazards and Climate Change Adaptation: I - The KULTURisk Methodological Framework Authors: Carlo Giupponi,Vahid Mojtahed,Animesh K. Gain,Stefano Balbi A conceptual framework integrating different disciplines has been developed to comprehensively evaluate the benefits of risk prevention. Three main innovations are proposed with regards to the state of the art: (1) to include the social capacities of reducing risk, (2) to go beyond the estimation… Elsevier BV	2013-01-01
The Economics of Hydro-Meteorological Disasters: Approaching the Estimation of the Total Costs Authors: Stefano Balbi,Carlo Giupponi,Roland Olschewski,Vahid Mojtahed 21 p. Elsevier BV	2013-01-01