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Papers by rosa espinola

Research paper thumbnail of How Can Neural Networks Speed Up Ecological Regionalization Friendly? - Replacement of Field Studies by Satellite Data using RBFs

Research paper thumbnail of Disfunción ventricular transitoria o síndrome de Tako-Tsubo

Research paper thumbnail of Day-ahead electricity price forecasting using the wavelet transform and ARIMA models

IEEE Transactions on Power Systems, 2005

Research paper thumbnail of Forecasting electricity prices for a day-ahead pool-based electric energy market

International Journal of Forecasting, 2005

Research paper thumbnail of Myocardial perfusion defects in patients with autoimmune diseases: a prospective study. Analysis of two diagnostic tests

Lupus, 2006

A significant correlation between autoimmune diseases and premature or accelerated coronary ather... more A significant correlation between autoimmune diseases and premature or accelerated coronary atherosclerosis has been found. The objectives of the study were: (a) to evaluate myocardial perfusion defects in patients with autoimmune diseases by contrast echocardiography and nuclear imaging; and (b) to evaluate the prevalence of alterations in subclinical myocardial perfusion defects in autoimmune diseases. Myocardial perfusion in 37 patients was evaluated by contrast echocardiography at rest and with dobutamine and with nuclear imaging. The agreement between the two diagnostic tests at rest was 0.72 (P < 0.0001) and with dobutamine was 0.65 (P < 0.0001). The prevalence of abnormalities in myocardial perfusion in autoimmune diseases by contrast echocardiography and nuclear imaging was 27% and in patients with primary antiphospholipid syndrome was 30%. We concluded that there is a high level of agreement between contrast ecocardiography and nuclear imaging for assessment of myocardial perfusion defects in patients with autoimmune diseases, and their prevalence is similar to that reported in the literature.

Research paper thumbnail of Characterization of Texture in Images by Using a Cellular Automata Approach

Spatial patterns in an image that shows a visual perception of roughness or softness of the surfa... more Spatial patterns in an image that shows a visual perception of roughness or softness of the surface is known as the texture of the image. Most of the analysis and description of texture found in the literature is based on statistical or structural properties of this attribute [2]. The field of cellular automata (CA), which has been developed mainly to model the dynamical behavior of systems, is based on the behavior or arrangements of pixel values and their neighborhood which, according to some rules behaves in different manners [2, 8]. In this paper, within the frame of structural approach, a novel method based on the properties of linear cellular automata is proposed to characterize different sort of textures. To this purpose, it is assumed that a binary version of the image under study was generated by a cellular automata technique. By using this model a number of textural primitives are found which allows the production of a characterizing image. In order to verify the feasibility of the proposed method, texture images generated by CA techniques as well as natural images has been used.

Research paper thumbnail of A new virtual task to evaluate human place learning

Behavioural Brain Research, 2008

Research paper thumbnail of The effect of wind generation and weekday on Spanish electricity spot price forecasting

Research paper thumbnail of Experimental Right Atrial Ischemia and Its Response to Stimulation with Dobutamine

Echocardiography-a Journal of Cardiovascular Ultrasound and Allied Techniques, 1998

In order to analyze the repercussion of experimental isolated selected right atrial ischemia on t... more In order to analyze the repercussion of experimental isolated selected right atrial ischemia on the hemodynamics of both ventricles, we investigated the response of atrial myocardium with administration of dobutamine and evaluated the utility of transesophageal echocardiography (TEE) with Doppler in the examination of alterations produced by atrial ischemia. Ten dogs were studied with normal, diminished, and increased cardiac output with ligation of the visible atrial branches of the right coronary artery. Right atrial wall movement and peak A wave velocity of tricuspid flow registered by TEE decreased (P < 0.05). The amplitude of the right atrial A wave decreased in hemodynamic recordings (P < 0.05). No significant modifications occurred in right ventricular wall movement nor in pressures registered in right or left ventricles or cardiac output. Seventy-five minutes after atrial ischemia was induced dobutamine was administered. In dogs with incomplete ligations of atrial circulation, right atrial wall movement improved (P < 0.001), and the amplitude of the peak A wave velocity of tricuspid flow increased. In dogs with complete coronary ligation, administration of the medication produced no improvement of these variables. The findings indicate that it is possible to produce selective right atrial ischemia manifested by diminished wall movement, a diminished atrial component of tricuspid flow in TEE, and decreased amplitude of the A wave in atrial pressure recordings. The localized hemodynamic changes produced by right atrial ischemia are not related to variations in venous return when right ventricular function is normal. Apparently isolated right atrial damage from ischemia does not affect ventricular function if these remain healthy. The recuperation of atrial contractility can be demonstrated with dobutamine. Transesophageal echocardiography is a very useful technique for studying right atrial ischemia and infarction.

Research paper thumbnail of Cellular Automata Applied in Remote Sensing to Implement Contextual Pseudo-fuzzy Classification

Nowadays, remote sensing is used in many environmental applications, helping to solve and improve... more Nowadays, remote sensing is used in many environmental applications, helping to solve and improve the social problems derived from them. Examples of remotely sensed applications include soil quality studies, water resources searching, environmental protection or meteorology simulations. The classification algorithms are one of the most important techniques used in remote sensing that help developers to interpret the information contained in the satellite images. At present, there are several classification processes, i.e., maximum likelihood, paralelepiped or minimum distance classifier. In this paper we investigate a new satellite image classification Algorithm based on Cellular Automata (ACA), a technique usually used by researchers on complex systems. There are not previous works related to satellite image classification with cellular automata. This new kind of satellite image classifier, that improves the results obtained by classical algorithms in several aspects, has been validated and experimented in the SOLERES framework.

Research paper thumbnail of TAREA 3 Sexualidad

Research paper thumbnail of How Can Neural Networks Speed Up Ecological Regionalization Friendly? - Replacement of Field Studies by Satellite Data using RBFs

Research paper thumbnail of Disfunción ventricular transitoria o síndrome de Tako-Tsubo

Research paper thumbnail of Day-ahead electricity price forecasting using the wavelet transform and ARIMA models

IEEE Transactions on Power Systems, 2005

Research paper thumbnail of Forecasting electricity prices for a day-ahead pool-based electric energy market

International Journal of Forecasting, 2005

Research paper thumbnail of Myocardial perfusion defects in patients with autoimmune diseases: a prospective study. Analysis of two diagnostic tests

Lupus, 2006

A significant correlation between autoimmune diseases and premature or accelerated coronary ather... more A significant correlation between autoimmune diseases and premature or accelerated coronary atherosclerosis has been found. The objectives of the study were: (a) to evaluate myocardial perfusion defects in patients with autoimmune diseases by contrast echocardiography and nuclear imaging; and (b) to evaluate the prevalence of alterations in subclinical myocardial perfusion defects in autoimmune diseases. Myocardial perfusion in 37 patients was evaluated by contrast echocardiography at rest and with dobutamine and with nuclear imaging. The agreement between the two diagnostic tests at rest was 0.72 (P &amp;amp;amp;amp;amp;amp;lt; 0.0001) and with dobutamine was 0.65 (P &amp;amp;amp;amp;amp;amp;lt; 0.0001). The prevalence of abnormalities in myocardial perfusion in autoimmune diseases by contrast echocardiography and nuclear imaging was 27% and in patients with primary antiphospholipid syndrome was 30%. We concluded that there is a high level of agreement between contrast ecocardiography and nuclear imaging for assessment of myocardial perfusion defects in patients with autoimmune diseases, and their prevalence is similar to that reported in the literature.

Research paper thumbnail of Characterization of Texture in Images by Using a Cellular Automata Approach

Spatial patterns in an image that shows a visual perception of roughness or softness of the surfa... more Spatial patterns in an image that shows a visual perception of roughness or softness of the surface is known as the texture of the image. Most of the analysis and description of texture found in the literature is based on statistical or structural properties of this attribute [2]. The field of cellular automata (CA), which has been developed mainly to model the dynamical behavior of systems, is based on the behavior or arrangements of pixel values and their neighborhood which, according to some rules behaves in different manners [2, 8]. In this paper, within the frame of structural approach, a novel method based on the properties of linear cellular automata is proposed to characterize different sort of textures. To this purpose, it is assumed that a binary version of the image under study was generated by a cellular automata technique. By using this model a number of textural primitives are found which allows the production of a characterizing image. In order to verify the feasibility of the proposed method, texture images generated by CA techniques as well as natural images has been used.

Research paper thumbnail of A new virtual task to evaluate human place learning

Behavioural Brain Research, 2008

Research paper thumbnail of The effect of wind generation and weekday on Spanish electricity spot price forecasting

Research paper thumbnail of Experimental Right Atrial Ischemia and Its Response to Stimulation with Dobutamine

Echocardiography-a Journal of Cardiovascular Ultrasound and Allied Techniques, 1998

In order to analyze the repercussion of experimental isolated selected right atrial ischemia on t... more In order to analyze the repercussion of experimental isolated selected right atrial ischemia on the hemodynamics of both ventricles, we investigated the response of atrial myocardium with administration of dobutamine and evaluated the utility of transesophageal echocardiography (TEE) with Doppler in the examination of alterations produced by atrial ischemia. Ten dogs were studied with normal, diminished, and increased cardiac output with ligation of the visible atrial branches of the right coronary artery. Right atrial wall movement and peak A wave velocity of tricuspid flow registered by TEE decreased (P < 0.05). The amplitude of the right atrial A wave decreased in hemodynamic recordings (P < 0.05). No significant modifications occurred in right ventricular wall movement nor in pressures registered in right or left ventricles or cardiac output. Seventy-five minutes after atrial ischemia was induced dobutamine was administered. In dogs with incomplete ligations of atrial circulation, right atrial wall movement improved (P < 0.001), and the amplitude of the peak A wave velocity of tricuspid flow increased. In dogs with complete coronary ligation, administration of the medication produced no improvement of these variables. The findings indicate that it is possible to produce selective right atrial ischemia manifested by diminished wall movement, a diminished atrial component of tricuspid flow in TEE, and decreased amplitude of the A wave in atrial pressure recordings. The localized hemodynamic changes produced by right atrial ischemia are not related to variations in venous return when right ventricular function is normal. Apparently isolated right atrial damage from ischemia does not affect ventricular function if these remain healthy. The recuperation of atrial contractility can be demonstrated with dobutamine. Transesophageal echocardiography is a very useful technique for studying right atrial ischemia and infarction.

Research paper thumbnail of Cellular Automata Applied in Remote Sensing to Implement Contextual Pseudo-fuzzy Classification

Nowadays, remote sensing is used in many environmental applications, helping to solve and improve... more Nowadays, remote sensing is used in many environmental applications, helping to solve and improve the social problems derived from them. Examples of remotely sensed applications include soil quality studies, water resources searching, environmental protection or meteorology simulations. The classification algorithms are one of the most important techniques used in remote sensing that help developers to interpret the information contained in the satellite images. At present, there are several classification processes, i.e., maximum likelihood, paralelepiped or minimum distance classifier. In this paper we investigate a new satellite image classification Algorithm based on Cellular Automata (ACA), a technique usually used by researchers on complex systems. There are not previous works related to satellite image classification with cellular automata. This new kind of satellite image classifier, that improves the results obtained by classical algorithms in several aspects, has been validated and experimented in the SOLERES framework.

Research paper thumbnail of TAREA 3 Sexualidad