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Browsing by Subject "Inverse problem"

Now showing items 1-18 of 18

A markov chain monte carlo method for inverse stochastic modeling and uncertainty assessment

Fu, Jianlin (Universitat Politècnica de València, 2008-05-07)

Unlike the traditional two-stage methods, a conditional and inverse-conditional simulation approach may directly generate independent, identically distributed realizations to honor both static data and state data in one ...
Algorithms for solving the inverse problem associated with KAK = A(s+1)

Lebtahi Ep-Kadi-Hahifi, Leila; Romero Martínez, José Oscar; Thome Coppo, Néstor Javier (Elsevier, 2017)

[EN] In previous papers, the authors introduced and characterized a class of matrices called {K, s+1}-potent. Also, they established a method to construct these matrices. The purpose of this paper is to solve the associated ...
Atrial location optimization by electrical measures for Electrocardiographic Imaging

Gisbert Soler, Víctor; Jiménez-Serrano, Santiago; Roses-Albert, Eduardo; RODRIGO BORT, MIGUEL (Elsevier, 2020-12)

[EN] Background: The Electrocardiographic Imaging (ECGI) technique, used to non-invasively reconstruct the epicardial electrical activity, requires an accurate model of the atria and torso anatomy. Here we evaluate a new ...
Desarrollo de algoritmos para la identificación de patrones reentrantes en flutter auricular mediante la resolución del problema inverso de la electrocardiografía

Correas García, María (Universitat Politècnica de València, 2021-10-04)

[ES] El flutter auricular es un tipo de taquicardia que supone el 10% de las arritmias supraventriculares en adultos y tiene una incidencia del 1% de la población. En cuanto a su tratamiento, cada vez se realiza más la ...
Effects of Geometry in Atrial Fibrillation Markers Obtained With Electrocardiographic Imaging

Molero-Alabau, Rubén; Climent, Andreu M.; Hernández-Romero, Ismael; Liberos, Alejandro; Fernández-Avilés, Francisco; Atienza, Felipe; Guillem Sánchez, María Salud; Rodrigo, Miguel (IEEE, 2019-09-11)

[EN] Electrocardiographic imaging (ECGI) can characterise cardiac pathologies such as atrial fibrillation (AF) through specific markers based on frequency or phase analysis. In this study, the effect of the geometry of ...
Electrocardiographic imaging including intracardiac information to achieve accurate global mapping during atrial fibrillation

Cámara-Vázquez, Miguel Ángel; Hernández-Romero, Ismael; Rodrigo, Miguel; Alonso-Atienza, Felipe; Figuera, Carlos; Morgado-Reyes, Eduardo; Atienza, Felipe; Guillem Sánchez, María Salud; Climent, Andreu M.; Barquero-Pérez, Óscar (Elsevier, 2021-02)

[EN] Atrial fibrillation (AF) is characterized by complex and irregular propagation patterns. Noninvasive electrocardiographic imaging (ECGI) has been tested during AF conditions with promising results. However, current ...
Experimental design of dynamic model-based damage identification in piezoelectric ceramics

Rus, Guillermo; Palma, Roberto; Pérez-Aparicio, José L. (ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 2012)

[EN] A model-based inverse problem strategy is proposed for damage characterization, starting from the electromechanical response measurement as input data, and incorporating a numerical model that simulates the piezoelectric ...
Filtering strategies of electrocardiographic imaging signals for stratification of atrial fibrillation patients

Molero-Alabau, Rubén; Hernández-Romero, Ismael; M. Climent, Andreu; Guillem Sánchez, María Salud (Elsevier, 2023-03)

[EN] Background and objective: Electrocardiographic imaging (ECGI) has been used for guiding atrial fibrillation (AF) ablation, identifying reentrant activity by phase analysis with promising results. The objective of ...
Further results on generalized centro-invertible matrices

Lebtahi Ep-Kadi-Hahifi, Leila; Romero Martínez, José Oscar; Thome, Néstor (Springer-Verlag, 2018)

[EN] This paper deals with generalized centro-invertible matrices introduced by the authors in Lebtahi et al. (Appl. Math. Lett. 38, 106¿109, 2014). As a first result, we state the coordinability between the classes of ...
Highest dominant frequency and rotor positions are robust markers of driver location during noninvasive mapping of atrial fibrillation: A computational study

RODRIGO BORT, MIGUEL; Climent, Andreu M.; Liberos Mascarell, Alejandro; Fernandez-Aviles, Francisco; Berenfeld, Omer; Atienza, Felipe; Guillem Sánchez, María Salud (Elsevier, 2017-08)

[EN] BACKGROUND Dominant frequency (DF) and rotor mapping have been proposed as noninvasive techniques to guide localization of drivers maintaining atrial fibrillation (AF). OBJECTIVE The purpose of this study was to ...
Modelo de Identificación de Fuentes Sonoras. Aplicación al Ruido del Motor de un Automóvil

Redel Macías, M. D.; Berckmans, D.; Cubero Atienza, A. J. (Universitat Politècnica de València, 2010-07-09)

[ES] La Directiva 49/2002/CE de la UE obliga a los fabricantes de vehículos a certificar las emisiones de ruido al exterior, estableciendo importantes restricciones al respecto. Por lo tanto, resulta imperativo establecer ...
Noise Analysis in Computed Tomography (CT) Image Reconstruction using QR-Decomposition Algorithm

Iborra Carreres, Amadeo; Rodríguez Álvarez, María José; Soriano Asensi, Antonio; Sanchez, F.; Bellido, P.; Conde Castellanos, Pablo Eloy; Crespo Navarro, Efren; González Martínez, Antonio Javier; Moliner Martínez, Laura; Rigla Pérez, Juan Pablo; Seimetz, Michael; Vidal San Sebastián, Luis Fernando; Benlloch Baviera, Jose María (Institute of Electrical and Electronics Engineers (IEEE), 2015-06)

In this paper, the noise of 3D computed tomography (CT) image reconstruction using QR-Decomposition is analyzed. There are several types of image noise that can interfere with the interpretation of an image. Here, the ...
Non-invasive estimation of atrial fibrillation driver position using long-short term memory neural networks and body surface potentials

Gutiérrez-Fernández-Calvillo, Miriam; Cámara-Vázquez, Miguel Ángel; Hernández-Romero, Ismael; Guillem Sánchez, María Salud; Climent, Andreu M.; Fambuena-Santos, Carlos; Barquero-Pérez, Óscar (Elsevier, 2024-04)

[EN] Background and Objective: Atrial Fibrillation (AF) is a supraventricular tachyarrhythmia that can lead to thromboembolism, hearlt failure, ischemic stroke, and a decreased quality of life. Characterizing the locations ...
Non-invasive Reconstruction of the Myocardial Electrical Activity from Body Surface Potential Recordings

Pedrón Torrecilla, Jorge (Universitat Politècnica de València, 2015-11-30)

[EN] The behavior of the heart is governed by electrical currents generated in the myocardium, and therefore, the study of the cardiac electrical activity is essential for the diagnosis of cardiac diseases. The forward ...
Optimal measurement setup for damage detection in piezoelectric plates

Rus, G.; Palma Guerrero, Roberto; Pérez-Aparicio, José L. (Elsevier, 2009-04)

[EN] An optimization of the excitation-measurement configuration is proposed for the characterization of damage in PZT-4 piezoelectric plates, from a numerical point of view. To perform such an optimization, a numerical ...
Regularization Techniques for ECG Imaging during Atrial Fibrillation: A Computational Study

Figuera C; Suárez Gutiérrez V; Hernández-Romero, Ismael; Rodrigo Bort, Miguel; Liberos Mascarell, Alejandro; Atienza, F.; Guillem Sánchez, María Salud; Barquero-Pérez O; Climent, A.M.; Alonso Atienza, Felipe (Frontiers Media, 2016-10-14)

The inverse problem of electrocardiography is usually analyzed during stationary rhythms. However, the performance of the regularization methods under fibrillatory conditions has not been fully studied. In this work, we ...
Stochastic Inverse Methods to Identify non-Gaussian Model Parameters in Heterogeneous Aquifers

Zhou ., Haiyan (Universitat Politècnica de València, 2011-10-21)

La modelación numérica del flujo de agua subterránea y del transporte de masa se está convirtiendo en un criterio de referencia en la actualidad para la evaluación de recursos hídricos y la protección del medio ambiente. ...
Two-step numerical procedure for complex permittivity retrieval of dielectric materials from reflection measurements

Hasar, Ugur Cem; Barroso, Joaquim José; Kaya, Yunus; Ertugrul, Mehmet; Bute, Musa; Catalá Civera, José Manuel (Springer Verlag, 2014-09)

A two-step measurement procedure has been proposed for measurement of complex permittivity of dielectric materials using one-port reflection measurements. In the procedure, as a first step, a graphical method is applied ...