Publications

Displaying 876 - 900 of 1351

Publication	Date
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
A three-dimensional self-adaptive hp finite element method for the characterization of waveguide discontinuities Authors: Gómez Revuelto, Ignacio,García Castillo, Luis E.,Llorente Romano, Sergio,Pardo, David We propose the use of a highly-accurate three-dimensional (3D) fully automatic hp-adaptive finite element method (FEM) for the characterization of rectangular waveguide discontinuities. These discontinuities are either the unavoidable result of mechanical/electrical transitions or deliberately… Elsevier BV	2012-12-01
Robustness of different TMR granularities in shared wishbone architectures on SRAM FPGA Authors: Uli Kretzschmar,Armando Astarloa,Jesús Lázaro,M. Garay,J. Del Ser Triple Module Redundancy (TMR) is a popular technique for protecting critical FPGA designs. Although automatic tools for TMR generation mostly use triplication on flip-flop level, designers may opt for different approaches. This work analyses the impact of different granularities on TMR… IEEE	2012-12-01
What mechanism of niche segregation allows the coexistence of sympatric sibling rhinolophid bats? Authors: Salsamendi Pagola, Egoitz,Garín Atorrasagasti, Ignacio,Arostegui Madariaga, Inmaculada,Goiti Ugarte, Urtzi,Aiartza Azurtza, José Ramón AbstractIntroductionOur purpose was to assess how pairs of sibling horseshoe bats coexists when their morphology and echolocation are almost identical. We collected data on echolocation, wing morphology, diet, and habitat use of sympatricRhinolophus mehelyiandR.euryale. We compared our results with… Springer Science and Business Media LLC	2012-11-13
Vertical cloud structure of the 2009 Jupiter impact based on HST/WFC3 observations Authors: Santiago Pérez-Hoyos,J. F. Sanz-Requena,John Clarke,Michael H. Wong,Keith S. Noll,Agustín Sánchez-Lavega,H. B. Hammel,G. S. Orton,Amy A. Simon-Miller,I. de Pater Abstract The impact of a body of unknown origin with Jupiter in July 2009 produced an intense perturbation of the planet’s atmosphere at the visible cloud levels. The vertical cloud structure was deeply affected by the presence of a strongly absorbing dense aerosol layer that was expanded… Elsevier BV	2012-11-01
The origin and evolution of Saturn’s 2011–2012 stratospheric vortex Authors: Agustín Sánchez-Lavega,Pgj Irwin,James Sinclair,Jon Legarreta,G. S. Orton,Gordon L. Bjoraker,Amy A. Simon-Miller,Brigette E. Hesman,Peter L. Read,N. Gorius,F. M. Flasar,Jane Hurley,Leigh N. Fletcher,R. K. Achterberg,Enrique Garcia-Melendo The planet-encircling springtime storm in Saturn's troposphere (December 2010-July 2011, Fletcher, L.N. et al. [2011]. Science 332, 1413-1414; Sánchez-Lavega, A. et al. [2011]. Nature 475, 71-74; Fischer, G. et al. [2011]. Nature 475, 75-77) produced dramatic perturbations to stratospheric… Elsevier BV	2012-11-01
Amino acid signatures in the Ovar-DRB1 peptide-binding pockets are associated with Ovine Pulmonary Adenocarcinoma susceptibility/resistance Authors: Koldo Garcia-Etxebarria,Ramón A. Juste,Amaia Larruskain,Begoña M. Jugo,Inmaculada Arostegui,E. Minguijón,Bernardino Moreno Potential relationships between amino acid motifs of various alleles of the ovine major histocompatibility complex DR (Ovar-DR) molecule and occurrence of clinical OPA caused by JSRV were investigated in a case-control study. Latxa sheep (n=132) screened for presence/absence of pulmonary OPA… Elsevier BV	2012-11-01
Using Multidimensional Bayesian Network Classifiers to Assist the Treatment of Multiple Sclerosis Authors: David Arteta,Aritz Pérez,J.D. Rodriguez,Diego Tejedor,Jose A. Lozano Multiple sclerosis is an autoimmune disorder of the central nervous system and potentially the most common cause of neurological disability in young adults. The clinical disease course is highly variable and different multiple sclerosis subtypes can be defined depending on the progression of the… Institute of Electrical and Electronics Engineers (IEEE)	2012-11-01
Efficient design of a double‐band coplanar hybrid antenna using multi‐objective evolutionary programming Authors: Itziar Landa-Torres,Rocio Sanchez-Montero,Pablo López-Espí,J. Del Ser,Diana Manjarres,Sancho Salcedo-Sanz SUMMARYIn this paper, we propose the optimization of the parameters of a hybrid antenna for wireless applications by using a multi‐objective evolutionary programming (EP). Specifically, the antenna proposed is formed by a planar inverted‐F antenna and a coplanar patch, in the same structure. The… Wiley	2012-10-16
Asymptotic analysis of flooding in CSMA-based large scale ad-hoc wireless networks Authors: Javier Del Ser,Susana Pérez-Sánchez,Babak Hossein Khalaj,Seyed Pooya Shariatpanahi,Hamed Shah-Mansouri Abstract Abstract In this article, we study the asymptotic behavior of flooding in large scale wireless networks. Specifically, we derive an upper bound on the coverage of flooding when the number of nodes n in the network goes to infinity. We consider two… Springer Science and Business Media LLC	2012-10-12
Solution of the 3D-Helmholtz equation in exterior domains using spherical harmonic decomposition Authors: G. Garate,J. Santamaria,E.G. Vadillo,David Pardo AbstractThis work is devoted to a finite element formulation for the Helmholtz equation in exterior domains. The proposed formulation uses a separation of variables, combining a 2D FE discretization on an intermediate spherical boundary and an ‘a priori’ analytical pattern for the radial direction… Elsevier BV	2012-10-01
PlanetCam UPV/EHU: a simultaneous visible and near infrared lucky-imaging camera to study solar system objects Authors: Santiago Pérez-Hoyos,Ricardo Hueso,Agustín Sánchez-Lavega,Gaizka Murga,L. de Bilbao,Jose Félix Rojas,Javier Ariño PlanetCam is a two-channel camera designed primarily to observe the atmospheres of the planets (Venus, Mars, Jupiter, Saturn, Uranus and Neptune) and the satellite Titan simultaneously at visible (0.4-1 microns) and NIR (1-2.5 microns) wavelengths with high temporal and spatial resolution. This… SPIE	2012-09-24
Analysis of quantization effects on the performance of cooperative MIMO techniques in wireless networks Authors: Seyed Pooya Shariatpanahi,Javier Del Ser,Babak Hossein Khalaj,Hamed Shah-Mansouri Abstract The most successful achievable schemes for ad hoc wireless networks are those based on establishing cooperative multiple-input and multiple-output links. In this article, we analyze one of the important design parameters of such schemes, namely the number of quantization bits.… Springer Science and Business Media LLC	2012-09-18
Probing clouds in planets with a simple radiative transfer model: the Jupiter case Authors: Santiago Pérez-Hoyos,Agustín Sánchez-Lavega,I. Mendikoa Remote sensing of planets evokes using expensive on-orbit satellites and gathering complex data from space. However, the basic properties of clouds in planetary atmospheres can be successfully estimated with small telescopes even from an urban environment using currently available and affordable… IOP Publishing	2012-09-12
Differentiation in the Cloud: Methodology for Integrating Customer Values in Experience Design Authors: Bronan McCabe,Javier Del Ser,Kaisa Koskela-Huotari,Kaarina Karppinen,Andrey Sirotkin How do organizations know they are designing products and services that their customers will value? This paper describes the initial results of the first four stages of a methodology for integrating customer Values in Experience design (ViEx). The theory of universal value structure was adapted to… IEEE	2012-09-01
Mobile clouds: How to find opportunities Authors: Parishad Karimi,Mohammad Javad Salehi,Ghazal Fazelnia,Babak Hossein Khalaj,Marcos Katz,Javier Del Ser Smartphones can be regarded as resource pools which are capable of communicating with their outside world using both short-range and long-range links. Such communication capabilities provide a unique opportunity for sharing resources, resulting in new possibilities for end users. In this paper, we… IEEE	2012-09-01
A comparative study of two hybrid grouping evolutionary techniques for the capacitated P-median problem Authors: Itziar Landa-Torres,J. Del Ser,Sergio Gil-Lopez,Jose A. Portilla-Figueras,O. Alonso-Garrido,Sancho Salcedo-Sanz This paper addresses the application of two different grouping-based algorithms to the so-called capacitated P-median problem (CPMP). The CPMP is an NP-complete problem, well-known in the operations research field, arising from a wide spectrum of applications in diverse fields such as… Elsevier BV	2012-09-01
A discrete Particle Swarm Optimization Algorithm for Mobile Network Deployment Problems Authors: J. Plaza-Laina,J. Del Ser,Antonio Portilla-Figueras,P. Garcia-Diaz,Sancho Salcedo-Sanz In this paper we present a hybrid discrete Particle Swarm Optimization (PSO) algorithm for the Mobile Network Deployment Problem (MNDP). First, we fully describe the MNDP, including a term for taking into account the Electromagnetic field produced by new locations of BTSs. We also describe the… IEEE	2012-09-01
A preliminary approach to near-optimal multi-hop capacitated network design using grouping-dandelion encoded heuristics Authors: J. Del Ser,Sergio Gil-Lopez,Itziar Landa-Torres,Diana Manjarres,Sancho Salcedo-Sanz In this paper we outline a novel global heuristic tool to deal with a combination of the Capacitated P-Median (CPMP) and the Capacitated Minimum Spanning Tree (CMST) problems. This preliminary approach provides an efficient (in terms of power consumption due to emission or signal interferences)… IEEE	2012-09-01
Spectrum band and RAT selection for infrastructure governed opportunistic networks Authors: Mustonen, Miia,Matinmikko, Marja,Höyhtyä, Marko,Del Ser,Javier,Sarvanko, Heli This paper presents a modular decision flow for the selection of radio access technique (RAT), carrier frequency, and bandwidth for opportunistic networks that are operator governed temporary extensions of mobile communication network infrastructures. In this study the emphasis is placed on finding… IEEE	2012-09-01
A heuristically-driven multi-criteria tool for the design of efficient open WiFi access networks Authors: Sancho Salcedo-Sanz,Itziar Landa-Torres,Diana Manjarres,Sergio Gil-Lopez,J. Del Ser This paper presents a novel heuristic multi-criteria tool capable of generating open-access wireless network deployments by exploiting the existing broadband infrastructure. Specifically, an external user dynamically selects, by virtue of our proposed scheme, a certain network layout depending on… IEEE	2012-09-01