Ignacio García-Fernández

Ignacio García-Fernández
University of Valencia | UV · Department of Informatic

PhD

About

61
Publications
17,227
Reads
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245
Citations
Citations since 2016
36 Research Items
181 Citations
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Introduction
Ignacio García-Fernández currently works at the Department of Computer Science, University of Valencia. He's mathematician and PhD in Computer Science. His research focuses on the development of models and algorithms for physics based animation, and on the application of simulation to biomedical engineering.
Additional affiliations
October 2012 - present
University of Valencia
Position
  • Professor
October 2004 - September 2012
University of Valencia
Position
  • Lecturer
July 2001 - December 2011
University of Valencia
Position
  • Researcher

Publications

Publications (61)
Article
Full-text available
Personalized cardiac electrophysiology simulations have demonstrated great potential to study cardiac arrhythmias and help in therapy planning of radio-frequency ablation. Its application to analyze vulnerability to ventricular tachycardia and sudden cardiac death in infarcted patients has been recently explored. However, the detailed multi-scale b...
Article
Full-text available
The combination of machine learning methods together with computational modeling and simulation of the cardiovascular system brings the possibility of obtaining very valuable information about new therapies or clinical devices through in-silico experiments. However, the application of machine learning methods demands access to large cohorts of pati...
Chapter
The ellipse can be an appropriate geometry for aorta cross-section fitting on the lumen contour. However, in some regions of the aorta, such as the Sinuses of Valsalva, this approximation can suffer of a relatively high error. Thus, some authors use closed polynomial curves for a better representation of the cross section. This paper presents a det...
Chapter
Full-text available
Patients that have suffered a myocardial infarction are at lifetime high risk for sudden cardiac death (SCD). Personalized 3D computational modeling and simulation can help to find non-invasively arrhythmogenic features of patients’ infarcts, and to provide additional information for stratification and planning of radiofrequency ablation (RFA). Cur...
Article
The Purkinje system is a heart structure responsible for transmitting electrical impulses through the ventricles in a fast and coordinated way to trigger mechanical contraction. Estimating a patient-specific compatible Purkinje Network from an electro-anatomical map is a challenging task, that could help to improve models for electrophysiology simu...
Article
Full-text available
Reinforcement learning is one of the most promising machine learning techniques to get intelligent behaviors for embodied agents in simulations. The output of the classic Temporal Difference family of Reinforcement Learning algorithms adopts the form of a value function expressed as a numeric table or a function approximator. The learned behavior i...
Article
Full-text available
El análisis del proceso de resolución de problemas en matemáticas permite obtener información sobre cómo se produce el aprendizaje. Sin embargo, el análisis de este proceso es una tarea complicada debido a la complejidad y no linealidad del propio proceso. En este trabajo presentamos la herramienta de software TTT diseñada para facilitar el registr...
Presentation
En Didáctica de la Matemática el estudio del proceso de resolución de problemas por parte de los estudiantes es relevante ya que permite analizar los procesos cognitivos que se ponen en juego durante ese proceso de resolución. Diferentes autores han propuesto herramientas y esquemas para realizar un registro que permita el posterior análisis macros...
Article
Full-text available
We focus on the problem of shock wave formation in a model of blood flow along an elastic artery. We analyze the conditions under which this phenomenon can appear and we provide an estimation of the instant of shock formation. Numerical simulations of the model have been conducted using the Discontinuous Galerkin Finite Element Method. The results...
Article
Full-text available
div data-canvas-width="460.953206963072">Aunque las asignaturas de matemáticas son un tema básico en los estudios de una ingeniería, a menudo son considerados por los estudiantes como una asignatura difícil. En este trabajo presentamos una experiencia de aprendizaje basada en la animación por ordenador mediante el uso de la modelización matemática....
Article
The reconstruction of the ventricular cardiac conduction system (CCS) from patient‐specific data is a challenging problem. High‐resolution imaging techniques have allowed only the segmentation of proximal sections of the CCS from images acquired ex‐vivo. In this paper we present an algorithm to estimate the location of a set of Purkinje‐myocardial...
Article
Full-text available
Introduction: Focal atrial tachycardia is commonly treated by radio frequency ablation with an acceptable long-term success. Although the location of ectopic foci tends to appear in specific hot-spots, they can be located virtually in any atrial region. Multi-electrode surface ECG systems allow acquiring dense body surface potential maps (BSPM) for...
Article
Modeling the cardiac conduction system is a challenging problem in the context of computational cardiac electrophysiology. Its ventricular section, the Purkinje system, is responsible for triggering tissue electrical activation at discrete terminal locations, which subsequently spreads throughout the ventricles. In this paper, we present an algorit...
Article
The simulation of high viscoelasticity poses important computational challenges. One is the diffculty to robustly measure strain and its derivatives in a medium without permanent structure. Another is the high stiffness of the governing differential equations. Solutions that tackle these challenges exist, but they are computationally slow. We propo...
Article
Full-text available
Modeling pedestrian dynamics and their implementation in a computer are challenging and important issues in the knowledge areas of transportation and computer simulation. The aim of this article is to provide a bibliographic outlook so that the reader may have quick access to the most relevant works related to this problem. We have used three main...
Conference Paper
Full-text available
The activation of the myocardial muscle is triggered by Purkinje-myocardial junctions (PMJs), which are the terminal sites of the specialised cardiac conduction system (CCS). Obtaining the location of the PMJs and other sources of endocardial ectopic activity would be desirable for building computer models of cardiac electrophysiology and planning...
Poster
Full-text available
Comparison of soft deformable materials when using physically-based models (as Finite Element Method) to Position Based Dynamics, which is not physically-based.
Poster
Full-text available
The description of blood flow in elastic arteries is carried out by means of a hyperbolic system of partial differential equations. From a mathematical point of view, there is no theoretical result to ensure that the solution is a smooth flow, i.e., shock waves may appear. Using the method of characteristics, this means that two characteristics cou...
Conference Paper
Full-text available
Electro-anatomical mapping is a widely used technique used by electrophysiologists to understand patient's activation pattern. The system measures activation time at different locations but does not provide information on underlying electrical pathways or triggering points, such as Purkinje-myocardial junctions or ectopic foci. We present a method...
Conference Paper
Full-text available
Modeling the cardiac conduction system is a challenging problem in the context of computational cardiac electrophysiology. Its main structure in the ventricles is the Purkinje system, which is responsible for triggering heart contraction. Since it cannot be visualized by means of medical imaging techniques, it is commonly neglected or inversely est...
Conference Paper
Full-text available
Hair simulation is a common topic extensively studied in computer graphics. One of the many challenges in this field is simulating realistic hair in a real-time environment. In this paper, we propose a unified simulation scheme to consider three of the key features in hair simulation; inextensibility, shape preservation and hair-hair interaction. W...
Article
Full-text available
Texture advection techniques, which transport textures using a velocity field, are used to visualize the dynamics of a flow on a triangle mesh. Some flow phenomena lead to velocity fields with discontinuities that cause the deformation of the texture which is not properly controlled by these techniques. We propose a method to detect and visualize d...
Article
Full-text available
Cellular automata are used for modelling and simulation of many systems. In some applications, the system is formed by a set of subsystems that can be modelled separately, but, in such cases, the existence of interactions between these subsystems requires additional modelling and computer programming. In this paper we propose a modelling methodolog...
Conference Paper
Full-text available
In this paper we present an application for teaching Physics courses in secondary education. It is a web application, based on HTML5 and on JavaScript. We rely on the graphical capabilities of this technology, including rendering on 2D canvas context and SVG rendering, and we develop a framework for simulating physics behavior. We review other appl...
Chapter
Full-text available
EUROSTAT figures show that 5720 people die in the European Union every year as a consequence of work-related accidents. Training in Health and Safety is indeed a key aspect to reduce this figure, and serious games constitute an effective method to provide this training. However, the development of this type of computer applications is a complex iss...
Article
Full-text available
This paper presents the efforts that have been made during the development of a set of harbour training simulators to improve their quality. The paper focuses on two main research lines: the improvement of complex physical systems involved in the simulation and the analysis of hardware architecture solutions. Cable-based hoist systems and bulk mate...
Article
RESUMEN La evolución y abaratamiento de los costes de los equipos informáticos y, en especial, de los procesadores gráficos, han potenciado el uso de las herramientas de entrenamiento basadas en simulación, aplicadas al ámbito civil. Sin embargo, a pesar de los avances que se han producido en el modelado dinámico, existen carencias importantes en l...
Conference Paper
Full-text available
This paper presents a simulation-based instructional sys- tem for harbor crane operators training. The configurable design of the simulator allows the training of several crane types: Quay-Side Gantry, Rubber Tired Gantry, Mobile, Reach-Stacker and Ro-Ro tractor. In this paper the simulator architecture, the Virtual Reality techniques, the projecti...
Article
Full-text available
Theoretical cable-pulley dynamics models usually lead to computationally expensive numerical models. For this reason, both mass and cable oscillation are usually neglected when efficiency is an issue. Recently a new model has been presented that allows the simulation of cable oscillation and catenary with low computational cost. In this paper, we p...
Conference Paper
Full-text available
In this paper, the way to simulate hoisting cables in real time is addressed. We overcome instability in such simulation by considering a two-layered model: a model for the dynamics of a cable passing through a set of pulleys and an oscillation model based on the classical one-dimensional wave equation. The first layer considers the interaction bet...
Article
Full-text available
The interactive simulation of 3D terrains has been approached from several perspectives. Due to the complexity of the system involved, most of the models proposed focus on a visually realistic animation of the scene, rather than on a physically-based accurate simulation of a granular system. Those models lack generality when interacting with the en...
Article
Full-text available
A model of a cable and pulleys is presented that can be used in Real Time Computer Graphics applications. The model is formulated by the coupling of a damped spring and a variable coefficient wave equation, and can be integrated in more complex mechanical models of lift systems, such as cranes, elevators, etc. with a high degree of interactivity.
Conference Paper
Full-text available
This paper presents an application of Cellular Automata in the field of dry Granular Systems modelling. While the study of granular systems is not a recent field, no efficient models exist, from a computational point of view, in classical methodologies. Some previous works showed that the use of Cellular Automata is suitable for the development of...
Conference Paper
Full-text available
In this paper a new cellular automata model suitable for granular systems simulation is presented. The proposed model is shown to be equivalent to a particularization of the well known BCRE model of granular systems and a correspondence between the parameters of the presented model and the BCRE model is also set, allowing to fit these parameters fo...
Article
The objective of the present work is to find a Collision Detection algorithm to be used in the Virtual Reality crane simulator (UVSim®), developed by the Robotics Institute of the University of Valencia for the Port of Valencia. The method is applicable to box-shaped objects and is based on the relationship between the colliding object positions an...
Conference Paper
Full-text available
Granular systems appear in many industrial and agricul-tural disciplines, which has lead to a wide range of models for their simulation, both in engineering and applied physics. However, most of the current models are addressed to make a deep analysis of the properties of the system, and they are not suitable for their use in real-time simulations....
Article
This work focuses on the subject of impact response modeling in Real Time rigid body simulation, and more precisely in those applications where a very high accuracy in the solution is not required. The problem of impact response has several aspects to overcome, such as the instantaneous nature of the forces that appear during the contact, the absen...
Article
Full-text available
This paper overviews some models based on the Chip Firing Game and propose a modification of the Abelian Sand Pile Model in a lattice in order to implement a realistic simulation of a pile of sand falling and finding an stable configuration. We have modified the update rule in the way that now is based on the comparison among neighbour nodes. We fo...
Conference Paper
Full-text available
The objective of the present work has been to develop a collision detection algorithm suitable for real-time applications. It is applicable to box-shaped objects and it is based on the relation between the colliding object positions and the impact point. The most known neural network (multilayer perceptron) trained with the familiar backpropagation...

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Projects

Projects (5)
Project
Identify biomarkers to characterize the relationship between aorta geometry and Wall Shear Stress under different pathological conditions.
Project
Develop mathematical and numerical methods to estimate the Cardiac Conduction System (CCS) from patient specific data.
Project
Our goal is to quantitatively evaluate the behaviour of PBD based models and compare them to different refrence models.