oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Search Results: 1 - 10 of 2805 matches for " Mariano Frutos "
All listed articles are free for downloading (OA Articles)
Page 1 /2805
Display every page Item
A New Approach to the Optimization of the CVRP through Genetic Algorithms  [PDF]
Mariano Frutos, Fernando Tohmé
American Journal of Operations Research (AJOR) , 2012, DOI: 10.4236/ajor.2012.24058
Abstract: This paper presents a new approach to the analysis of complex distribution problems under capacity constraints. These problems are known in the literature as CVRPs (Capacitated Vehicle Routing Problems). The procedure introduced in this paper optimizes a transformed variant of a CVRP. It starts generating feasible clusters and codifies their ordering. In the next stage the procedure feeds this information into a genetic algorithm for its optimization. This makes the algorithm independent of the constraints and improves its performance. Van Breedam problems have been used to test this technique. While the results obtained are similar to those in other works, the processing times are longer.
EVOLUTIONARY MULTI-OBJECTIVE SCHEDULING PROCEDURES IN NON-STANDARDIZED PRODUCTION PROCESSES
MARIANO FRUTOS,FERNANDO TOHMé
DYNA , 2012,
Abstract: RESUMEN: En los problemas de programación de la producción que involucran dise ar, coordinar, administrar y controlar todas las operaciones presentes en el proceso productivo, aparecen numerosos problemas de optimización multi-objetivo (MOPs). Los MOPs constan de varias funciones que suelen ser complejas y evaluarlas puede ser muy costoso. La optimización multi-objetivo es la disciplina que trata de encontrar las soluciones, denominadas Pareto óptimas, a este tipo de problemas. La compleja resolución de los MOPs es debida a las dimensiones del problema, al carácter combinatorio de los algoritmos y a la naturaleza de los objetivos los cuales están vinculados a la eficiencia del sistema. En las últimas décadas muchos MOPs vinculados a la producción han sido tratados con éxito con técnicas de resolución basadas en algoritmos genéticos (GAs). En este trabajo se evalúa a NSGAII (Non-dominated Sorting Genetic Algorithm II), SPEAII (Strength Pareto Evolutionary algorithm II) y a sus antecesores, NSGA y SPEA, en el proceso de planificación de la producción no estandarizada.
Técnicas evolutivas en problemas multi-objetivos en el proceso de planificación de la producción
Frutos-Alazard,Mariano; Tohmé-Hauptmann,Fernando;
Ingenier?-a Industrial , 2012,
Abstract: planning in production environments takes care of designing, coordinating, managing and controlling all the operations existing in the use of productive systems. there are, in the framework analyzed within this work, several relevant multi-objective optimization problems (mops). they consist of several functions which tend to be complex and expensive to evaluate. multi-objective optimization is the discipline developed to provide solutions, called pareto optimal, for the simultaneous optimization of those functions. the costs of solving mops is due to the dimension of the problems, the combinatorial nature of the algorithms and the kind of objectives represented, linked to the efficiency of the system.. in the last decades several production-related mops have been handled successfully by means of genetic algorithms. here we will evaluate the performance of some particular genetic-based algorithms like nsgaii (non-dominated sorting genetic algorithm ii), speaii (strength pareto evolutionary algorithm ii) and their predecessors, nsga and spea, in the process of planning non-standardized production activities. after the experiment was carried out, the nsgaii algorithm proved to be more efficient.
TéCNICAS EVOLUTIVAS EN PROBLEMAS MULTI-OBJETIVOS EN EL PROCESO DE PLANIFICACIóN DE LA PRODUCCIóN / EVOLUTIONARY TECHNIQUES FOR MULTI-OBJECTIVE PROBLEMS IN PRODUCTION PLANNING
Mariano Frutos-Alazard,Fernando Tohmé-Hauptmann
Ingeniería Industrial , 2012,
Abstract: La planificación, en el ámbito productivo, se encarga de dise ar, coordinar, administrar y controlar todas las operaciones que se hallan presentes en la explotación de los sistemas productivos. En este marco de trabajo, aparecen numerosos Problemas de Optimización Multi-objetivo (MOPs). éstos constan de varias funciones que suelen ser complejas y evaluarlas puede ser muy costoso. La optimización multi-objetivo es la disciplina que trata de encontrar las soluciones, denominadas Pareto óptimas, a este tipo de problemas. La compleja resolución de los MOPs es debida a las dimensiones propias del problema, al carácter combinatorio de los algoritmos y a la naturaleza de los objetivos, los cuales están vinculados a la eficiencia del sistema. En las últimas décadas muchos MOPs vinculados a la producción han sido tratados con éxito con técnicas de resolución basadas en Algoritmos Genéticos. En este trabajo se evalúa a NSGAII (Non-dominated Sorting Genetic Algorithm II), SPEAII (Strength Pareto Evolutionary Algorithm II) y a sus antecesores, NSGA y SPEA, en el proceso de planificación de la producción no estandarizada. Luego de la experiencia realizada, el algoritmo NSGAII mostró mayor eficiencia.Planning in production environments takes care of designing, coordinating, managing and controlling all the operations existing in the use of productive systems. There are, in the framework analyzed within this work, several relevant Multi-Objective Optimization Problems (MOPs). They consist of several functions which tend to be complex and expensive to evaluate. Multi-objective optimization is the discipline developed to provide solutions, called Pareto optimal, for the simultaneous optimization of those functions. The costs of solving MOPs is due to the dimension of the problems, the combinatorial nature of the algorithms and the kind of objectives represented, linked to the efficiency of the system.. In the last decades several production-related MOPs have been handled successfully by means of Genetic Algorithms. Here we will evaluate the performance of some particular genetic-based algorithms like NSGAII (Non-dominated Sorting Genetic Algorithm II), SPEAII (Strength Pareto Evolutionary Algorithm II) and their predecessors, NSGA and SPEA, in the process of planning non-standardized production activities. After the experiment was carried out, the NSGAII algorithm proved to be more efficient.
Five Independents Variables Affecting Bullying: Neighborhood, Family, School, Gender-Age and Mass Media  [PDF]
Teodoro Hernandez de Frutos
Sociology Mind (SM) , 2013, DOI: 10.4236/sm.2013.34041
Abstract:

It is probably true to say that bullying is the psychosocial phenomenon which has attracted the most attention in academic circles over the last ten years. It affects approximately three to five percent of adolescents from twelve to eighteen years of age worldwide to a serious degree and up to twenty percent of this population to a lesser degree. The long and short term effects of bullying are considered to be extremely damaging. The importance of this phenomenon is that it may give rise to low self-esteem, anomie, depression, isolation, psychosomatic symptoms, failure at school and in extreme cases, it may result in suicide and future incidences of bullying in the workplace and within the home. As the number and the seriousness of incidents increases, many parents worry that the problem is spiralling out of control. In recent years, there has been a proliferation of publications on bullying, with an emphasis on how, when and where it occurs, but not on the factors which cause it. This meta-analysis studies the influence of five social environmental variables: neighborhood, family, school, gender-age and the mass media, considered on both an individual and interactional level, as their effects are often augmented when two or more variables are examined together. The concept “bullying” encompasses both individual and collective aggression and individual and collective victimization.

Approximate Kerr-Like Metric with Quadrupole  [PDF]
Francisco Frutos-Alfaro
International Journal of Astronomy and Astrophysics (IJAA) , 2016, DOI: 10.4236/ijaa.2016.63028
Abstract: A new approximate metric representing the spacetime of a rotating deformed body is obtained by perturbing the Kerr metric to include up to the second order of the quadrupole moment. It has a simple form, because it is Kerr-like. Its Taylor expansion form coincides with second order quadrupole metrics with slow rotation already found. Moreover, it can be transformed to an improved Hartle-Thorne metric, which guarantees its validity to be useful in studying compact object, and it is possible to find an inner solution.
Tal es la su auze: El héroe afortunado del Cantar de mio Cid
Montaner Frutos,Alberto;
Olivar , 2007,
Abstract: the main character of cantar de mio cid is a moderate hero, but also a lucky one, gifted with auze or good fortune and "born at a lucky hour". his fortune is innate, but is also the result of his prudence. the joining of equilibrium and boldness allows the cid to keep up his auze. in addition, the optimism of the lucky hero lends a strong dynamism to the whole epic poem.
Densidad y diversidad del zooplancton en los ríos Salado y Negro --Planicie del Río Paraná -- Argentina
MARGARITA FRUTOS, SANTA;
Revista Brasileira de Biologia , 1998, DOI: 10.1590/S0034-71081998000300008
Abstract: zooplankton abundance and diversity of salado and negro rivers were compared in relation to the water level fluctuations. the zooplankton pumper samples were collected between march, 1993 and october, 1994. mean zooplankton density at salado river was very higher in upstreem. zooplankton density in the negro and salado rivers were variable in the high water phase. changes in the density appeared to be related to the hydrologic phases, seasonal cycle and conductivity variation. the zooplankton abundance was positively correlated with the abiotic and biotic factors (temperature, transparency and fitoplankton). the dominant group in the two studied rivers were the rotifers. the dominant species in the high water phase were limnoplanktonic and scarce ticoplanktonic organisms, in the low water phase the present organisms were euryhalin. the highest diversity was taken in the negro river with major floodplain. the jaccard index (1908 ) showed no similarity zooplankton between salado and negro rivers.
A queuing-based model for optimal dimension of service firms
Isabel Parra-Frutos
SERIEs , 2010, DOI: 10.1007/s13209-009-0005-8
Abstract: This paper examines a stochastic model to determine optimal pricing, waiting time, output, and sizing decisions for service firms which compete on time in an uncertain environment. Sizing decisions concern optimal service capacity and maximum physical waiting room (with a given probability). Customers are sensitive to money price and expected waiting time. The firm, modeled as an M/M/1 queue, is assumed to be a full price taker as a result of the stochastic version of the perfect competition assumption. Firm costs function includes fixed and variable costs. We initially fix the service rate and obtain a closed-form expression for the waiting time, price, output and waiting room which lead to maximize the net revenue. Subsequently, we obtain first-order conditions for the profit maximizing service capacity. We find that an optimal capacity may exist when service capacity costs are strictly convex. When capacity costs are linear or concave, an optimal capacity does not exist, and it is possible to obtain higher expected profits by increasing service capacity, as the time competition principle states. However, in the linear case we find a failure of that principle, which is, there is a limit in speeding up processes.
Valoración de la calidad del agua de abastecimiento: medidas defensivas frente a disposición a pagar por su mejora
Pablo de Frutos
Urban Public Economics Review , 2010,
Abstract: El objeto de estudio del presente trabajo es desarrollar una comparación entre el gasto defensivo de un hogar, derivado deuna mala calidad del agua de abastecimiento, y la disposición apagar por su mejora. Para ello se aplica el método de los costesevitados y el de valoración contingente a una muestra de hogaresde la ciudad de Soria y se comparan las medidas obtenidas. El principal hallazgo encontrado es que los resultados empíricos apoyan la teoría, de tal manera que, normalmente la disposición a pagar por la mejora debería superar al gasto en medidas defensivas.
Page 1 /2805
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.