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Search Results: 1 - 10 of 41439 matches for " Antonio Ruiz-Mayor "
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Approximate Robotic Mapping from sonar data by modeling Perceptions with Antonyms
Sergio Guadarrama,Antonio Ruiz-Mayor
Computer Science , 2010,
Abstract: This work, inspired by the idea of "Computing with Words and Perceptions" proposed by Zadeh in 2001, focuses on how to transform measurements into perceptions for the problem of map building by Autonomous Mobile Robots. We propose to model the perceptions obtained from sonar-sensors as two grid maps: one for obstacles and another for empty spaces. The rules used to build and integrate these maps are expressed by linguistic descriptions and modeled by fuzzy rules. The main difference of this approach from other studies reported in the literature is that the method presented here is based on the hypothesis that the concepts "occupied" and "empty" are antonyms rather than complementary (as it happens in probabilistic approaches), or independent (as it happens in the previous fuzzy models). Controlled experimentation with a real robot in three representative indoor environments has been performed and the results presented. We offer a qualitative and quantitative comparison of the estimated maps obtained by the probabilistic approach, the previous fuzzy method and the new antonyms-based fuzzy approach. It is shown that the maps obtained with the antonyms-based approach are better defined, capture better the shape of the walls and of the empty-spaces, and contain less errors due to rebounds and short-echoes. Furthermore, in spite of noise and low resolution inherent to the sonar-sensors used, the maps obtained are accurate and tolerant to imprecision.
High Blood Pressure Effects on the Brain Barriers and Choroid Plexus Secretion  [PDF]
Ibrahim González-Marrero, Leandro Casta?eyra-Ruiz, Juan M. González-Toledo, Agustín Casta?eyra-Ruiz, Héctor de Paz-Carmona, Lidia Ruiz-Mayor, Agustín Casta?eyra-Perdomo, Emilia M. Carmona-Calero
Neuroscience & Medicine (NM) , 2012, DOI: 10.4236/nm.2012.31009
Abstract: High blood pressure produces ventricular dilation, variations in circumventricular organs and changes in the cerebrospinal fluid compositions. On the other hand, chronic hypertension in spontaneously hypertensive rats can cause changes in the integrity of the brain barriers: blood-cerebrospinal fluid barrier and blood brain barrier. The permeability of the brain barriers can be studied by using transthyretin and S-100β. In the present work we study the integrity of the brain barrier and the choroid plexus function variations in arterial hypertension. Control rats and spontaneously hypertensive rats were used and the choroid plexus were processed by immunohistochemistry with anti-transthyretin and anti-vasopressin. Western blot was also performed in cerebrospinal fluid, serum and choroid plexus using anti-S-100β, anti-transthyretin. The accumulation of transthyretin immunoreactive was bigger in spontaneously hypertensive rats with respect to the control. Vasopressin was also higher in spontaneously hypertensive rats with respect to the control. Western blot showed that transthyretin tetramer was higher in the spontaneously hypertensive rats than in the control rats. The expression of transthyretin monomer was lower in hypertensive rats than the control in the cerebrospinal fluid, the transthyretin monomer reaction in the blood was stronger in hypertensive than in control rats. Western blot for the S-100 β showed an increase in blood and cerebrospinal fluid of hypertensive rats. The high blood pressure produces a disruption of the blood brain barrier and blood to cerebrospinal fluid barrier that allows extravasations from the cerebrospinal fluid to the blood and from the blood to the cerebrospinal fluid.
Hypertension effects on p73 expression in the rat circumventricular organs and cerebrospinal fluid  [PDF]
Emilia M. Carmona-Calero, Ibrahim González-Marrero, Manuela Casta?eyra-Martin, Juan M. González-Toledo, Leandro Casta?eyra-Ruiz, Héctor de Paz-Carmona, Agustín Casta?eyra-Ruiz, Lidia Ruiz-Mayor, Agustín Casta?eyra-Perdomo
World Journal of Neuroscience (WJNS) , 2012, DOI: 10.4236/wjns.2012.22010
Abstract: It has been reported that spontaneously hypertensive rats (SHR) show ventricular dilation, changes in CSF proteins and variations in the circumventricular organs (CVO) such as: the subcommissural organ (SCO), the subfornical organ (SFO) and the area postrema (AP) which are located in the walls of the third and fourth ventricles. On the other hand, p73 proteins are present in cells of the central nervous system (CNS) such as circumventricular structures and the neuroepithelium which are altered in ventricular dilation. The purpose of the present work is to study the TAp73 isoform expression in the circumventricular organs (CVO) and their variations in ventricular dilatation and arterial hypertension. Brains and cerebrospinal fluid (CSF) from control Wistar-Kyoto rats (WKY) and SHR were used. The paraffin sections containing the CVO were immunohistochemically proc-essed with anti-TAp73 and by western blot, p73 bands in the CSF and circumventricular organ extract were also identified. The western blot study showed bands marked with p73 in the CSF and CVO, the p73 band expression was bigger in the SHR than in the WKY rats. We also found stronger markings in the SFO, SCO and AP of the hypertensive rats than in the WKY rats. It could be concluded that hypertension in the SHR produces altera-tions in the relationship between the p73 protein, circumventricular structures and CSF.
NUEVOS RETOS PARA UNA UNIVERSIDAD EN PROCESO DE CAMBIO: PUEDEN SER LOS PROFESORES (PRINCIPIANTES) LOS PROTAGONISTAS?
Cristina Mayor Ruiz
PROFESORADO , 2009,
Abstract: Los nuevos cambios que se proponen para la Universidad espa ola desde el proceso de convergencia europea propician una amplia reflexión en el ámbito de la formación del profesorado universitario. La adecuación al EEES hace necesario pensar en estrategias institucionales que le faciliten a los docentes dicho período de adaptación. La figura del profesor novel adquiere especial relevancia en este nuevo marco de actuaciones, por sus características y situación institucional. En este trabajo revisamos el papel de la universidad con respecto a sus profesores, sus compromisos y responsabilidades; los obstáculos y oportunidades que desde la propia institución se ofrecen; y las acciones y actuaciones a asumir para afrontar los retos y desafíos que tiene planteados.
LAS FUNCIONES DEL PROFESOR UNIVERSITARIO ANALIZADAS POR SUS PROTAGONISTAS
Cristina Mayor Ruiz
Revista Electrónica de Investigación y Evaluación Educativa , 1996,
Abstract: The faculty must attend to three representative functions of this profession: the teaching, the research, and the management. The work that we present intends to investigate in these responsibilities, as well as in the limitations and preoccupations in connection with the professional conditions of the faculty of the University of Seville. The questionnaire is used as strategies of withdrawal of information. The belief of teachers with experience and beginning teachers certifies the fundamental shaft of this work. The analysis of data and the results originating from the same are presented in this study. El profesorado universitario debe atender a tres funciones representativas de esta profesión: la docencia, la investigación y la gestión. El trabajo que presentamos pretende indagar en estas responsabilidades, así como en las limitaciones y preocupaciones en torno a las condiciones profesionales del profesorado de la Universidad de Sevilla. El cuestionario es utilizado como técnica de recogida de información. La opinión de profesores con experiencia y profesores principiantes junto al grupo de titulación, llevado a cabo mediante el Análisis de Correspondencias Múltiples conforman el eje fundamental de este trabajo. El análisis de datos y los resultados procedentes del mismo son presentados en este estudio.
NUEVAS TENDENCIAS EN EL PROCESO DE FORMACIóN Y MENTORíA DE PROFESORES UNIVERSITARIOS NOVELES EN SU PRIMER A O DE DOCENCIA
Carmen Yot Domínguez,Cristina Mayor Ruiz
Olhar de Professor , 2012, DOI: 10.5212/olharprofr.v.15i2.0007
Abstract: This article describes the training program for beginning teachers at the University of Seville which considers future teachers′ own experience, and proposes the improvement of each of its phases, among others: the creation and strengthening of a social network where beginning teachers, and expert teachers can interact and communicate, incorporate the blog as a useful tool for the development of a portfolio that helps them refl ect on their teaching practice, as well as use games and simulations as a strategy or a tool for learning.Resumen: En el presente artículo se describe el programa de iniciación a la docencia de la Universidad de Sevilla a partir de la propia vivencia y se proponen líneas de mejora a cada una de sus fases, entre otras: crear y dinamizar una red social donde profesores principiantes y expertos puedan interactuar y comunicarse, incorporar el blog como herramienta útil para el desarrollo de un portfolio que ayude a la refl exión sobre la práctica pedagógica y utilizar los juegos y simulaciones como una estrategia o herramienta de aprendizaje más.
Testing statics-dynamics equivalence at the spin-glass transition in three dimensions
Luis Antonio Fernandez,Victor Martin-Mayor
Physics , 2014, DOI: 10.1103/PhysRevB.91.174202
Abstract: The statics-dynamics correspondence in spin glasses relate non-equilibrium results on large samples (the experimental realm) with equilibrium quantities computed on small systems (the typical arena for theoretical computations). Here we employ statics-dynamics equivalence to study the Ising spin-glass critical behavior in three dimensions. By means of Monte Carlo simulation, we follow the growth of the coherence length (the size of the glassy domains), on lattices too large to be thermalized. Thanks to the large coherence lengths we reach, we are able to obtain accurate results in excellent agreement with the best available equilibrium computations. To do so, we need to clarify the several physical meanings of the dynamic exponent close to the critical temperature.
Pectinmethylesterase extraction from orange solid wastes: Optimization and comparison between conventional and ultrasound-assisted treatments  [PDF]
Antonio D. Rodriguez-Lopez, Luis Mayor, María M. Galfarsoro, Jorge Martinez-Otalo, Esperanza M. Garcia-Castello
Agricultural Sciences (AS) , 2013, DOI: 10.4236/as.2013.49B008
Abstract:

During orange juice production, a half of fresh oranges weight is considered as production waste (peels, pulp, seeds, orange leaves and damaged orange fruits). An alternative for the management of these wastes is their treatment by addition of lime and a latter pressing, obtaining a press cake and a press liquor rich in sugars (10° Brix) and citric acid, protein, pectin and ethanol. For non-thermal concentration of press liquor to obtain citruss molasses (65°-70° Brix), the removal of pectin is necessary. Traditionally, depectinization of juices has been done by using pectinmethylesterase (PME) enzymes from external sources. In this work it performed the extraction of PME enzymes from orange peels to obtain the optimum extraction conditions. Two different methods of solventextraction were compared (conventional andultrasound-assisted methods). For the conventional extraction experiments, a central composite design with three variables ([NaCl], pH and time) and five replicates of the center point was used. For ultrasound-assisted extraction, experiments were done at pH = 5.5 and [NaCl] = 1.25M), varying extraction time (1-30 min). Response variables were PME activity, protein content and a ratio between them, named PME effectiveness (ηPME). At the same experimental conditions (pH =5.5, [NaCl] = 1.25 M, t = 15 min) it was found that conventional extractions led to slightly better results in terms of ηPME than ultrasound-assisted extraction method.

Los beneficios del liderazgo en el mercado de depósitos bancarios: una comparación entre Cournot y Stackelberg
Ruiz-Porras, Antonio;
EconoQuantum , 2008,
Abstract: we analyze the effects of leadership in banking when oligopolistic competition exists in the market of deposits. we assess such effects by comparing the performance of banking systems that only differ on their strategic interactions. specifically, we compare the outcomes associated to strategies of the cournot and stackelberg types (symmetric competition and leader-follower strategies). our main findings suggest that there are private and social benefits associated to leadership. the results suggest that it induces high levels of deposits, of returns and of consumption for long-term depositors. moreover, leadership induces a greater financial stability and efficiency in banking.
PRIVATIZACIóN, COMPETENCIA POR DEPóSITOS Y DESEMPE?O BANCARIOS
Ruiz-Porras,Antonio;
Estudios de economía , 2010, DOI: 10.4067/S0718-52862010000100004
Abstract: in this article, we develop a micro economic framework to study the relationships among privatization, competition for deposits and performance in banking. particularly, we analyze banking privatization when competitive strategies of the cournot and stackelberg types are allowed. our findings show that some conditions are necessary to justify it under the following criteria: (i) efficiency, (ii) market power/financial stability and (iii) consumption availability for depositors. they also show that privatizations are relatively easy to justify when leader-follower relationships are allowed in the banking system. even government revenues, due to privatization, are higher when these relationships exist.
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