137 resultados para Problema da Braquistócrona


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Neste trabalho, propomos um modelo integrado de dimensionamento de lotes e programação da produção monomáquina para uma fábrica de refrigerantes de pequeno porte. As decisões de dimensionamento foram baseadas em um modelo encontrado na literatura e as decisões de sequenciamento foram modeladas utilizando restrições do problema do caixeiro viajante assimétrico. Para a validação do modelo proposto foram feitos testes computacionais com exemplares gerados aleatoriamente, e também exemplares baseados em dados reais obtidos da literatura. Os exemplares foram resolvidos pelo método Branch-and-Cut incluído no pacote computacional CPLEX 10.0. Os resultados mostram que o modelo proposto representa o planejamento da produção em fábricas de bebidas monomáquinas e que, em algumas situações, produz resultados melhores que o modelo da literatura.

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This paper addresses the single stage lot-sizing problem in parallel machines. Each item can be produced on any machine, and incurs a setup time before to start the production. The objective of this paper is to obtain lower bounds of good quality for this problem. A solution method is developed based on a reformulation of the problem and the Lagrangian relaxation of a set of constraints. Some computational results are presented comparing the proposed method with a method from the literature and with a computational package.

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This work deals with the sequencing of Multi-Mixed-Model Assembly Lines in a lean manufacturing environment, where an operational structure where several kanbans support several mixed-model assembly lines, so that all assembly lines can receive parts or sub-assemblies from all suppliers. To optimize this system, the sequencing seeks to minimize the distance between the real consumption and the constant ideal consumption of parts or subassemblies, thereby reducing the scaling of kanbans and intermediate stocks. To solve the sequencing problems, the method Clustering Search was applied along with the metaheuristics Variable Neighborhood Search, Simulation Annealing and Iterative Local Search. Instances from the literature and generated instances were tested, thus allowing comparing the methods to each other and with other methods presented in the literature. The performance of the Clustering Search with Iterated Local Search stands out by the quality and robustness of their solutions, and mainly for its efficiency, whereas it converges to better results at a lower computational cost

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Filosofia - FFC

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Pós-graduação em Engenharia Elétrica - FEIS

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Pós-graduação em Engenharia Elétrica - FEIS

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This study, based on the model of Positive Behavior Support, aims to identify how 40 primary school directors describe the process of development, application, and evaluation of educational strategies for pupils with behavioral problems. The results from a questionnaire indicated that 77.5% of the directors had pupils with behavioral problems. The most commonly used educational strategies of intervention were to speak with the child (13.3%) or with the parents (13.3%). The most common action for evaluation was observation of the child (27.6%). In general, the study verified that the strategies were employed informally and unsystematically. These findings indicate that research about the inclusion of children with behavioral problems is needed and challenge to rethink about the educators professional training.

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Current paper discusses manifestations of the sublime in Pedro Kilkerry´s poetry as one of the distinguishing characteristics within the Parnassian orientations predominant in his cultural context. The particular way that Kilkerry employs the sublime´s expedients demonstrates the dialogue of his poetry with Romantic ideals, whose traits in his lyrical stance are directly linked to Symbolist influence, far from traditional Parnassian models. The sublime in Kilkerry develops through an elliptical and suggestive language that demonstrates the impossibility of the ideal being directly expressed and shows the affinity of his poetic work with the idealist crisis that marks post-Romantic poetry and provides the basis on which the poetics of Modernity is structured. The poetry of Pedro Kilkerry develops within a complex zone of convergence between the models provided by the Parnassian aesthetic, Romantic idealism with an atavic presence to Symbolism, and the search for new answers to old idealistic concerns. The meeting of these three conflictive currents, perceptible in the manifestations of the sublime in Pedro Kilkerry´s poetry, demonstrates his lyrical sensitivity to the trends of Modernity.

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Difficulties with sleep are frequent in the pre-schooler children. The aim of this study was to present a case report of behavioural intervention by parental guidance to sleeping problems in a pre-schooler child. Participated in this study a four years old boy that had difficulties to sleep without the presence of his parents and his mother who was oriented through a parental program. The program of intervention was composed by five sessions in which the mother acquired education about the child’s sleep, received orientation about the establishment of time and routine to sleep and about the use of techniques (extinction and positive reinforcement) for the improvement of the sleep difficulties. The sleep and behaviour were evaluated in four periods (pre-treatment, post-treatment, one and six months follow up) according to the following instruments: 1) UNESP Scale of Habits and Hygiene of the Sleep – Children Version, 2) Scale of Sleep Disorders for Children and Teenagers, 3) Child Behavior Checklist (CBCL 1,5-5) and 4) sleep diary. The results showed that after intervention the child developed independent sleep, reduced the bed resistance and showed improvement in daily behaviors. To conclude: a behavioral intervention by parental guidance was effective to sleep problems of the child.

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The most challenging Deleuze/Guattari’s lesson regar- ding art is that it is an autonomous way of thinking and bears of no lack relatively to philosophy and science. In fact, creating artistically is thinking. Throughout this article, I will try to show that art and philosophy are autonomous modes of thinking, as far as the statute of their creations is multiplicity. The multiplicity that characterizes philosophy is concept; the multiplicity that characterizes art is sen- sation. Both of them have their multiplicity character guaranteed by the instance of the problems, to which they are solutions. The most important is that the problems although independent constitute in- terference channels through which two modalities of meeting could happen. First, sensations point out how could a thinker endures in the instance of problems, avoiding both to deprive the concept and to fall in philosophical illusions. In second place in the instance of the problem philosophy and art exchange, so that either a thinker takes an art sensation and extracts from it its generating problem to be philosophically solved or, vice-versa, an artist takes a concept and solves its problem creating new art sensations.