Publications

Displaying 1101 - 1125 of 1307

Publication	Date
Sequential VT/VF discrimination algorithm based on wave mode sample entropy for adult and pediatric patients Authors: Elisabete Aramendi,S.R. de Gauna,Unai Irusta,Jesus Ruiz The two fatal ventricular arrhythmias, Ventricular Fibrillation (VF) and Ventricular Tachycardia (VT), are better treated using different electrical therapies: a lower energy cardioversion for VT and a defibrillation shock for VF. Automated External Defibrillators (AED), whose use for children is… IEEE	2007-09-01
Validation of a screening questionnaire for hip and knee osteoarthritis in old people Authors: Quintana López, José María,Arostegui Madariaga, Inmaculada,Escobar, Antonio,Lafuente Guerrero, Iratxe,Arenaza Merino, Juan Carlos,García, Isidoro,Aguirre, Urko To develop a sensitive and specific screening tool for knee and hip osteoarthritis in the general population of elderly people.The Knee and Hip OsteoArthritis Screening Questionnaire (KHOA-SQ) was developed based on previous studies and observed data and sent to 11,002 people aged 60 to 90 years,… Springer Science and Business Media LLC	2007-08-23
A self-adaptive goal-oriented hp-finite element method with electromagnetic applications. Part II: Electrodynamics Authors: Leszek Demkowicz,Carlos Torres-Verdín,Maciej Paszyński,David Pardo Abstract We present the formulation, implementation, and applications of a self-adaptive, goal-oriented, hp-Finite Element (FE) Method for Electromagnetic (EM) problems. The algorithm delivers (without any user interaction) a sequence of optimal hp-grids. This sequence of grids minimizes the… Elsevier BV	2007-08-01
A parallel framework for loopy belief propagation Authors: Alexander Mendiburu,Endika Bengoetxea,Jose A. Lozano,Roberto Santana There are many innovative proposals introduced in the literature under the evolutionary computation field, from which estimation of distribution algorithms (EDAs) is one of them. Their main characteristic is the use of probabilistic models to represent the (in) dependencies between the variables of… ACM	2007-07-07
Source Controlled Modulation Scheme for Sources with Memory Authors: Pedro M. Crespo,E. Loyo,C.J. Mitchell,J. Del Ser Given an AWGN channel, we look at the problem of designing a source controlled binary antipodal signaling system for transmitting blocks of binary symbols generated either by a Markov chain source (MC) or by a hidden Markov model source (HMM). The goal is to minimize the average SNR required for… IEEE	2007-06-01
Cloud brightness distribution and turbulence in Venus using Galileo violet images Authors: Agustín Sánchez-Lavega,Javier Peralta,Ricardo Hueso Venus cloud covered atmosphere offers a well-suited framework to study the coupling between the atmospheric dynamics and the structure of the cloud field. Violet images obtained during the Galileo flyby from 12 to 17 February 1990 have been analyzed to retrieve the zonal power spectra of the cloud… Elsevier BV	2007-06-01
Feasibility study for 2D frequency-dependent electromagnetic sensing through casing Authors: Leszek Demkowicz,Carlos Torres-Verdín,David Pardo We perform a numerical-sensitivity study of various physical phenomena of interest for borehole resistivity logging applications in steel-cased wells. Specifically, we analyze the sensitivity of through-casing measurements for detecting water invasion, shale-laminated sands, and electrical… Society of Exploration Geophysicists	2007-05-01
Improving the performance of perfectly matched layers by means of hp‐adaptivity Authors: Christian Michler,Jason Kurtz,David Pardo,Leszek Demkowicz AbstractWe improve the performance of the Perfectly Matched Layer (PML) by using an automatic hp‐adaptive discretization. By means of hp‐adaptivity, we obtain a sequence of discrete solutions that converges exponentially to the continuum solution. Asymptotically, we thus recover the property of the… Wiley	2007-04-26
Self-similar planar curves related to modified Korteweg–de Vries equation Authors: G. Perelman,Luis Vega AbstractWe exhibit a time reversible geometric flow of planar curves which can develop singularities in finite time within the uniform topology. The example is based on the construction of selfsimilar solutions of modified Korteweg–de Vries equation of a given (small) mean. Elsevier BV	2007-04-01
The three-dimensional structure of Saturn's equatorial jet at cloud level Authors: Agustín Sánchez-Lavega,Ricardo Hueso,Santiago Pérez-Hoyos Abstract The three-dimensional structure of Saturn's intense equatorial jet from latitudes 8° N to 20° S is revealed from detailed measurements of the motions and spectral reflectivity of clouds at visible wavelengths on high resolution images obtained by the Cassini Imaging Science Subsystem (… Elsevier BV	2007-04-01
On uniqueness properties of solutions of the k-generalized KdV equations Authors: Luis Vega,Carlos E. Kenig,Luis Escauriaza,Gustavo Ponce In this paper we study uniqueness properties of solutions of the k-generalized Korteweg-de Vries equation. Our goal is to obtain sufficient conditions on the behavior of the difference $u_1-u_2$ of two solutions $u_1, u_2$ of the equation at two different times $t_0=0$ and $t_1=1$ which guarantee… Elsevier BV	2007-03-01
Some weighted Gagliardo-Nirenberg inequalities and applications Authors: Javier Duoandikoetxea,Luis Vega We obtain conditions on the measure μ \mu so that the L 2 ( μ ) L^2(\mu ) -norm of a function is controlled by the L 2 L^2 -norms of the function and its gradient.… American Mathematical Society (AMS)	2007-02-09
Simulation of 3D Resistivity Logging Measurements with a Parallel Implementation of 2D hp-Adaptive Goal-Oriented Finite Element Method Authors: Maciej Paszyński,David Pardo,Carlos Torres-Verdín,Theodore E. Simos,George Psihoyios,Ch. Tsitouras The paper presents parallel simulations of 3D resistivity logging measurements. These simulations are performed with a new geometry‐based formulation with a 2D self‐adaptive goal‐oriented hp‐adaptive strategy combined with a Fourier series expansion in a non‐orthogonal system of coordinates.… AIP	2007-01-01
SemEval-2007 Task 01: Evaluating WSD on Cross-Language Information Retrieval Authors: Piek Vossen,Eneko Agirre,German Rigau,Bernardo Magnini,Arantxa Otegi,Oier Lopez de Lacalle This paper presents a first attempt of an application-driven evaluation exercise of WSD. We used a CLIR testbed from the Cross Lingual Evaluation Forum. The expansion, indexing and retrieval strategies where fixed by the organizers. The participants had to return both the topics and documents… Springer Berlin Heidelberg	2007-01-01
A Novel Dual-Frequency Multiple Access Relay Transmission Scheme Authors: B.H. Khalaj,Jesús Gutiérrez-Gutiérrez,Pedro M. Crespo,J. Del Ser As data rates are increasing continuously in wireless networks, additional ways of improving system performance and providing higher rates is needed. One scheme that has recently attracted a lot of attention, is using relays in order to provide additional diversity, especially in scenarios that use… IEEE	2007-01-01
Detection of ventricular fibrillation in the presence of cardiopulmonary resuscitation artefacts Authors: Elisabete Aramendi,Unai Irusta,Jesus Ruiz,Mª Fe Arcocha,Sofía Ruiz de Gauna,Jose Miguel Ormaetxe Providing cardiopulmonary resuscitation (CPR) to a patient in cardiac arrest introduces artefacts into the electrocardiogram (ECG), corrupting the diagnosis of the underlying heart rhythm. CPR must therefore be discontinued for reliable shock advice analysis by an automated external defibrillator (… Elsevier BV	2007-01-01
On the local smoothing for a class of conformally invariant Schrodinger equations Authors: VEGA L,VISCIGLIA, NICOLA We present some a - priori bounds from above and from below for solutions to a class of conformally invariant Schroedinger equations. As a by - product we deduce some new uniqueness results. Indiana University Mathematics Journal	2007-01-01
SemEval-2007 task 01 Authors: Agirre, E.,Lopez de Lacalle, O.,Magnini, B.,Otegi, A.,Rigau, G.,Vossen, P.T.J.M. This paper presents a first attempt of an application-driven evaluation exercise of WSD. We used a CLIR testbed from the Cross Lingual Evaluation Forum. The expansion, indexing and retrieval strategies where fixed by the organizers. The participants had to return both the topics and documents… Association for Computational Linguistics (ACL)	2007-01-01
Numerical simulation of 3D EM borehole measurements using an hp‐adaptive goal‐oriented finite‐element formulation Authors: Maciej Paszyński,Carlos Torres-Verdín,David Pardo We describe two different algorithms for automatic generation (without any user interaction) of optimal goal-oriented grids within a 3D higher-order Finite Element (FE) package, in context of simulation of electromagnetic borehole resistivity measurements for the assessment of rock formation… Society of Exploration Geophysicists	2007-01-01
On Uniqueness Properties of Solutions of Schrödinger Equations Authors: Luis Vega,Gustavo Ponce,Luis Escauriaza,Carlos E. Kenig In this paper we study uniqueness properties of solutions of Schrodinger equations of the form The aim is to deduce sufficient conditions on the asymptotic behavior of the difference of two solutio... Informa UK Limited	2006-12-01
Development of appropriateness explicit criteria for cataract extraction by phacoemulsification Authors: Quintana López, José María,Escobar, Antonio,Arostegui Madariaga, Inmaculada Abstract Background Consensus development techniques were used in the late 1980s to create explicit criteria for the appropriateness of cataract extraction. We developed a new appropriateness of indications tool for cataract following the RAND method. We tested… Springer Science and Business Media LLC	2006-12-01
Evaluation of Parallel EDAs to Create Chemical Calibration Models Authors: Jose Miguel-Alonso,Alexander Mendiburu,Jose A. Lozano Estimation of Distribution Algorithms (EDAs) are a set of optimization techniques that have been successfully applied to different kinds of problems. In this paper, we deal with the creation of multivariate calibration models in quantitative chemistry. For this purpose, we use parallel… IEEE	2006-12-01
The general quasilinear ultrahyperbolic Schrödinger equation Authors: Carlos E. Kenig,Luis Vega,Gustavo Ponce,Christian Rolvung In this work we establish a local existence theory for the initial value problem associated to the general quasi-linear ultrahyperbolic Schr��dinger equation. Elsevier BV	2006-11-01
A strong vortex in Saturn's South Pole Authors: Agustín Sánchez-Lavega,Jose Félix Rojas,Ricardo Hueso,Santiago Pérez-Hoyos Abstract Saturn's southern pole was observed at high resolution by the Cassini Imaging Science Subsystem (ISS) during the spacecraft insertion orbit in July 2004. Cloud tracking of individual features on images taken at a wavelength of 938 nm reveal the existence of a strong polar vortex enclosed… Elsevier BV	2006-10-01
Short-term changes in the belt/zone structure of Saturn's Southern Hemisphere (1996–2004) Authors: Agustín Sánchez-Lavega,Santiago Pérez-Hoyos,Richard G. French Aims. The main goal of this paper is to study the reflectivity changes that affect Saturn's global belt/zone pattern on time-scales from weeks to a few months, and to determine their frequency and intensity, as well as the variations of the vertical cloud structure that cause such changes. Methods… EDP Sciences	2006-09-12