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Search Results: 1 - 10 of 165265 matches for " Eduardo F.; "
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Relational Reinforcement Learning with Continuous Actions by Combining Behavioural Cloning and Locally Weighted Regression  [PDF]
Julio H. Zaragoza, Eduardo F. Morales
Journal of Intelligent Learning Systems and Applications (JILSA) , 2010, DOI: 10.4236/jilsa.2010.22010
Abstract: Reinforcement Learning is a commonly used technique for learning tasks in robotics, however, traditional algorithms are unable to handle large amounts of data coming from the robot’s sensors, require long training times, and use dis-crete actions. This work introduces TS-RRLCA, a two stage method to tackle these problems. In the first stage, low-level data coming from the robot’s sensors is transformed into a more natural, relational representation based on rooms, walls, corners, doors and obstacles, significantly reducing the state space. We use this representation along with Behavioural Cloning, i.e., traces provided by the user; to learn, in few iterations, a relational control policy with discrete actions which can be re-used in different environments. In the second stage, we use Locally Weighted Regression to transform the initial policy into a continuous actions policy. We tested our approach in simulation and with a real service robot on different environments for different navigation and following tasks. Results show how the policies can be used on different domains and perform smoother, faster and shorter paths than the original discrete actions policies.
An Independence Test Based on Joint Recurrences  [PDF]
Teresa Aparicio, Eduardo F. Pozo, Dulce Saura
Modern Economy (ME) , 2015, DOI: 10.4236/me.2015.68085
Abstract: We propose in this paper a test procedure to determine whether two series proceed from independent systems or not. Our starting point is a multivariate extension of the methodology called Recurrence Quantification Analysis (RQA). We derive the test procedure from the probability distribution of the number of joint recurrences of both series under the null hypothesis of independence. The behavior of the test is evaluated by means of a large set of simulations, carried out with different types of dynamical systems: random, deterministic chaotic, deterministic non-chaotic, systems affected by noise and coupled systems. We obtain satisfactory results in all cases. Finally, the methodology is used to study two questions, on which the bulk of the existing economic literature agrees: 1) the relationship between the nominal interest rate and the inflation rate; and 2) the relationship between the gross domestic product and the employment. The results suggest that our test can be a suitable tool for detecting linear and nonlinear dependence between real series.
Notas e reflex?es sobre a jurisprudência internacional em matéria ambiental: a participa??o de indivíduos e organiza??es n?o governamentais
Fonseca, Fúlvio Eduardo;
Ambiente & Sociedade , 2010, DOI: 10.1590/S1414-753X2010000200003
Abstract: the aim of this article is to present relevant international jusrisprudence involving ngos and environment in a systematic way. therefore, it seeks to identify examples of cases taken to international instances. the reasearch considered sentences and decisions as an example of the potential and limitation of the strategy used by an increasing number of individuals and organizations in making use of judicial (interamerican court of human rights, european court of human rights, european tribunal of justice and international court of justice) and quasi-judicial organs (united nations human rights committee), as an initial contribution to those interested in this issue and an incentive for future studies that could complement it.
A convergência entre a prote??o ambiental e a prote??o da pessoa humana no ambito do direito internacional
Fonseca, Fúlvio Eduardo;
Revista Brasileira de Política Internacional , 2007, DOI: 10.1590/S0034-73292007000100007
Abstract: environmental protection is connected to human been protection, implying the search of interfaces between both regimes, the main goal of this paper. convergence between environment and human rights will be traced back starting at the origin of the environmental international law, focalising the analysis of relevant international instruments, in order to demonstrate that they represent a common concern of humankind.
Biología reproductiva del águila Geranoaetus melanoleucus (Aves: Accipitridae) en Chile central
PAVEZ,EDUARDO F.;
Revista chilena de historia natural , 2001, DOI: 10.4067/S0716-078X2001000300014
Abstract: the breeding biology of the black-chested eagle (geranoaetus melanoleucus) was studied during a 2-year period (july 1987-january 1989) in san carlos de apoquindo, central chile. the beginning of the reproductive period was evident by the increased number of couple-flights. courting behavior included synchronized flights, cooperative capture of prey and transport of nest material, as well as copulation. prey exchanges between adults occurred throughout the year, although outside the breeding season they were uncommon and forced by the female. there were 4.7 nests/couple, a value that is in the upper limit of what has been reported for large eagles. during the non-breeding season, nests were only occasionally visited by the eagles. before laying, males visited the nest more frequently than females, but for shorter periods of time. visits to alternative nests carrying prey and nest material were observed in all three couples. the average clutch size was 2.3 eggs (sd = 0.5, n = 6), with both males and females incubating, and hatching success was 100 %. twenty five days after hatching, flight feathers started to appear in the wings and tail of chicks; after 35 days, chicks started eating by themselves prey items brought to the nest, and after 59 days they left the nest. while tending, females spent more time in the nest than males, although with a tendency of adults to diminish the time spent in the nest over time. seventy nine percent of the chicks survived, which can be considered a high reproductive success, explained by the high availability of prey in the study site, mainly european rabbits. the chicks remained in the adult's territory for 10 months and gradually started to reduce their presence in the area. this was coincident with the occurrence of the next laying period and an increased adult intolerance. these data concur with the pattern described in the literature for other eagles
EVALUACIóN DE LA SITUACIóN DE ACIDOS GRASOS ESENCIALES Y DERIVADOS DE CADENA LARGA EN LA DIETA DE LACTANTES MENORES DE UN A?O EN CHILE
Galgani F.,Eduardo;
Revista chilena de nutrición , 2004, DOI: 10.4067/S0717-75182004031100002
Abstract: essential fatty acids (efa) are precursors for very long-chain fatty acids. the latter fatty acids are highly concentrated in neural tissue, having a critical role in the visual and brain development. it is unknowin if bioconversion of efa is sufficient to support an optimal function. then, to define the efa and derivatives requirements is needed. several authors have suggested to add these derivatives fatty acids in milk formula. this article reviews the apparent dietary intake of efa and very long-chain fatty acids in chilean infants fed with the national program of complementary feeding and its relation with the current lipid recommendations. a critical situation for docosahexaenoic acid was observed in infants fed with non-modified milk formula or modified milk formula without addition of very long-chain fatty acids
Vegetales venenosos que pueden provocar intoxicaciones en el ni o
EDUARDO MORALES F
Revista chilena de pediatría , 1945,
Abstract:
La construcción de un modelo de regresión
Granados F. Eduardo
Revista Colombiana de Estadística , 1988,
Abstract:
Biología reproductiva del águila Geranoaetus melanoleucus (Aves: Accipitridae) en Chile central Breeding biology of the black-chested eagle Geranoaetus melanoleucus (Aves: Accipitridae) in central Chile
EDUARDO F. PAVEZ
Revista chilena de historia natural , 2001,
Abstract: Durante dos a os (julio 1987-enero 1989) se estudió la biología reproductiva del águila (Geranoaetus melanoleucus) en San Carlos de Apoquindo, en Chile central. El inicio del período reproductivo se evidenció por un aumento del número de vuelos en pareja. Los cortejos incluyeron vuelos sincronizados de la pareja, capturas, transporte de material al nido y cópulas. Los traspasos de presas ocurrieron durante todo el a o, aunque fuera del período reproductivo fueron escasos y forzados por la hembra. Se localizaron 4,7 nidos pareja-1, lo que está en el límite superior documentado para grandes águilas. Fuera del período reproductivo las águilas visitaron ocasionalmente los nidos. Antes de la postura el macho visitó el nido con mayor frecuencia y por menos tiempo que la hembra. En las tres parejas estudiadas se observó visitas a nidos alternativos, con aporte de material y presas. Se promedió 2,3 huevos postura-1 (DE = 0,5, n = 6), incubando macho y hembra, y eclosionando el 100 %. A los 25 días de edad comenzaron a emerger las plumas de vuelo de los pollos, a los 35 días comían solos las presas aportadas al nido y a los 59 días abandonaron el nido. Durante la crianza la hembra permaneció más tiempo en el nido que el macho, con una tendencia de los adultos a disminuir el tiempo de permanencia en el nido. El 79 % de los pollos sobrevivió a la crianza, lo que se puede considerar un éxito reproductivo elevado, y que se explicaría por la elevada disponibilidad de presas en el sitio de estudio, particularmente de conejos. Los pollos permanecieron en el territorio paterno 10 meses, lo que coincidió con la siguiente postura de huevos, disminuyendo gradualmente su presencia en el área y aumentando la intolerancia de los adultos hacia sus hijos. Los resultados presentados se corresponden con el patrón descrito en la literatura para otras águilas The breeding biology of the black-chested eagle (Geranoaetus melanoleucus) was studied during a 2-year period (July 1987-January 1989) in San Carlos de Apoquindo, central Chile. The beginning of the reproductive period was evident by the increased number of couple-flights. Courting behavior included synchronized flights, cooperative capture of prey and transport of nest material, as well as copulation. Prey exchanges between adults occurred throughout the year, although outside the breeding season they were uncommon and forced by the female. There were 4.7 nests/couple, a value that is in the upper limit of what has been reported for large eagles. During the non-breeding season, nests were only occasionally visited by the eagle
EVALUACIóN DE LA SITUACIóN DE ACIDOS GRASOS ESENCIALES Y DERIVADOS DE CADENA LARGA EN LA DIETA DE LACTANTES MENORES DE UN A O EN CHILE ASSESSMENT OF THE STATUS FOR ESSENTIAL FATTY ACIDS AND LONG-CHAIN DERIVATIVES IN THE DIET OF CHILDREN YOUNGER THAN 1 YEAR OLD FROM CHILE
Eduardo Galgani F.
Revista Chilena de Nutricíon , 2004,
Abstract: Los ácidos grasos esenciales (AGE) son precursores de ácidos grasos de muy larga cadena. Se concentran en el tejido nervioso, habiéndose sugerido que tienen un rol crítico en el desarrollo cerebral y visual. Se desconoce si la conversión de AGE a estos ácidos grasos es suficiente para sustentar una función óptima, por lo tanto es prioritario definir los requerimientos de AGE y sus derivados. Algunos autores sugieren incorporar estos ácidos grasos derivados en las fórmulas lácteas. Este artículo revisa y evalúa la ingesta aparente de ácidos grasos esenciales y derivados a partir de la fórmula láctea consumida por los lactantes beneficiarios del Programa Nacional de Alimentación Complementaria durante el primer a o de vida, comparándola con las recomendaciones de lípidos recientemente propuestas. Se observó una ingesta deficitaria de ácido docosahexaenoico en lactantes alimentados con fórmulas lácteas no modificadas o sin adición de derivados de cadena larga Essential fatty acids (EFA) are precursors for very long-chain fatty acids. The latter fatty acids are highly concentrated in neural tissue, having a critical role in the visual and brain development. It is unknowin if bioconversion of EFA is sufficient to support an optimal function. Then, to define the EFA and derivatives requirements is needed. Several authors have suggested to add these derivatives fatty acids in milk formula. This article reviews the apparent dietary intake of EFA and very long-chain fatty acids in chilean infants fed with the National Program of Complementary Feeding and its relation with the current lipid recommendations. A critical situation for docosahexaenoic acid was observed in infants fed with non-modified milk formula or modified milk formula without addition of very long-chain fatty acids
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