977 resultados para Lógica modal


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As Redes de Sensores Sem Fio possuem capacidades limitadas de processamento, armazenamento, comunicação (largura de banda) e fonte de energia, além de possuírem características e requisitos básicos de uma RSSF como: necessidade de se auto-organizar, comunicação com difusão de curto alcance e roteamento com múltiplos saltos. Neste trabalho é proposto uma ferramenta que otimize o posicionamento e os pacotes entregues através do uso de Algoritmo Genético (AG). Para solucionar o problema de roteamento que melhore o consumo de energia e maximize a agregação de dados é proposto a utilização de lógica fuzzy no protocolo de roteamento Ad hoc Ondemand Distance Vector (AODV). Esta customização é intitulada AODV – Fuzzy for Wireless Sensor Networks (AODV-FWSN). Os resultados mostram que a solução proposta é eficiente e consegue prolongar a vida útil da RSSF e melhorar a taxa de entrega de dados quando comparado com soluções similares.

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Este trabalho apresenta uma metodologia para o estudo da ambiguidade na interpretação de dados geofísicos. Várias soluções alternativas, representativas da região de maior ambiguidade no espaço de parâmetros são obtidas, sendo posteriormente grupadas e ordenadas pela análise fatorial modo Q. Esta metodologia foi aplicada a dados sintéticos de campo potencial simulando-se causas de ambiguidade como discretização e truncamento da anomalia e a presença de ruídos aleatório e geológico. Um único prisma foi usado como modelo interpretativo, sendo a espessura a principal causa de ambiguidade tanto na gravimetria como na magnetometria. Segue-se a profundidade do topo sempre associada à espessura, quando o sinal da anomalia é alto. Quando a anomalia tem sinal baixo, a largura torna-se o segundo parâmetro mais importante, também associada à espessura. Ao contrário da presença de interferências geológicas, a presença de ruído aleatório nos campos, não é fator importante na ambiguidade. A aplicação da metodologia a dados reais ilustra o papel desta análise na caracterização de soluções alternativas e a importância da informação a priori na caracterização das causas de ambiguidade. A metodologia apresentada pode ser empregada em diversos estágios de um programa de prospecção fornecendo em cada estágio uma análise dos principais fatores causadores da ambiguidade, que poderá ser util no planejamento dos estágios seguintes. Comparada a outros métodos de análise de ambiguidade, como por exemplo regiões de confiança, a metodologia estudada destaca-se por não precisar satisfazer premissas estatísticas sobre a distribuição dos erros.

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Pós-graduação em Engenharia Mecânica - FEG

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O presente artigo tenta recuperar as idéias e proposta de H.Furth (1973 ), apontando-a como mais uma opção para tentar trabalhar com as dificuldades das crianças no processo de alfabetização. O autor propõe a substituição das “escolas da linguagem” pelas “escolas do pensamento”, ou seja,substituir a opção do professor no ensino da leitura-escrita, em sua forma tradicional, de como transformar sinais gráficos em sonoros e vice-versa, por aquela do fortalecimento do pensamento, alimentando o intelecto em desenvolvimento da criança por meio de exercícios de “lógica simbólica”.Para nos embasar teoricamente, apresentamos ainda alguns aspectos da teoria psicogenética, bem como outros trabalhos realizados mais recentemente sobre o assunto, que embora “travestidos” (disfarçados) com novas roupagens, ainda encontram seus fundamentos nas obras de J.Piaget.

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Trabalho exploratório visando detectar a existência de uma lógica simbólica na medicina popular (fitoterapia).

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Within the field of Discourse Analysis (Pêcheux) and psychoanalysis, this work states interdiction and silence as constituents and founders of the discourse. In short, we claim that what makes it possible to say anything is that it is not possible to say it all, so something must remain unsaid. The logic principle here is that the contradiction, the excluded founds the possible. For such task we use the logic square. We also propose and build a square of the saying or of the utterances. The analysis made here points toward the existence of the impossible in language, and also indicates how important a modal approach of language can be.

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The National Program for Strengthening Family Agriculture (Pronaf) has included family farmers into the scope of public policies, by following the trends of policies from the 1990s to democratize access to financial resources. Sustainability has been put into the program. In this study, the overall purpose was analyze the objectives of Pronaf, in the context of economic development. We found out that Pronaf would not allow evaluating the relation among activities conducted and results obtained by the program. Thus, it would be inconsistent. Besides analyzing official documents, other specific objectives were to analyze the consistency of Pronaf and, in case of inconsistency, propose a logical framework matrix. No project was found, only the legislation. The analyse of the latter does not allow filling the matrix and this indicates an inconsistency. A full matrix was proposed.

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Pós-graduação em Engenharia Elétrica - FEIS

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Pós-graduação em Ciências Cartográficas - FCT

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The information retrieval process involves subjective, imprecise and vague concepts, such as "information need", "relevance", and the very concept of "information". The main information retrieval models treat these concepts accurately, represented by a single numerical value. The fuzzy logic, while operating with the uncertainty of natural phenomena in a systematic and rigorous manner, represents a promising alternative to solve some problems related to information retrieval. This paper presents the fuzzy logic and some examples of its use in information retrieval systems (IRS).

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In this paper, natural frequencies were analyzed (axial, torsional and flexural) and frequency response of a vertical rotor with a hard disk at the edge through the classical modal and complex analysis. The equation that rules the movement was obtained through the Lagrangian formulation. The model considered the effects of bending, torsion and axial deformation of the shaft, besides the gravitational and gyroscopic effects. The finite element method was used to discretize the structure into hollow cylindrical elements with 12 degrees of freedom. Mass, stiffness and gyroscopic matrices were explained consistently. The classical modal analysis, usually applied to stationary structures, does not consider an important characteristic of rotating machinery which are the methods of forward and backward whirl. Initially, through the traditional modal analysis, axial and torsional natural frequencies were obtained in a static shaft, since they do not suffer the influence of gyroscopic effects. Later research was performed by complex modal analysis. This type of tool, based on the use of complex coordinates to describe the dynamic behavior of rotating shaft, allows the decomposition of the system in two submodes, backward and forward. Thus, it is possible to clearly visualize that the orbit and direction of the precessional motion around the line of the rotating shaft is not deformed. A finite element program was developed using MATLAB (TM) and numerical simulations were performed to validate this model. Natural frequencies and directional frequency forced response (dFRF) were obtained using the complex modal analysis for a simple vertical rotor and also for a typical drill string used in the construction of oil wells.

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The present work develops a model to simulate the dynamics of a quadcopter being controlled by a PD fuzzy controller. Initially is presented a brief history of quadcopters an introduction to fuzzy logic and fuzzy control systems. Afterwards is presented an overview of the quadcopter dynamics and the mathematical modelling development applying Newton-Euler method. Then the modelling are implemented in a Simulink model in addition to a PD fuzzy controller. A prototype proposition is made, by describing each necessary component to build up a quadcopter. In the end the results from the simulators are discussed and compared due to the discrepancy between the model using ideal sensor and the model using non-ideal sensors

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This work has as its aims to offer a general view on the teaching of logics in the basic education by means of different materials on the theme. There are highlighted considerations on academic works in the area of math education that claims the teaching of logics on basic education as a means of developing the reason and promote the learning. It is done a bibliographic review on works that approach the theory of formal logics that presents different ways of working the teaching of logics. The curricular proposition of São Paulo State for the Math area is analyzed and its characteristics are discussed. The learning evaluation in a large federal scale for the teaching of middle and basic education are detailed in its matrix of references and content approached in its editions searching the evidences of a logical reasoning worth. A portal M3 Multimedia math is presented in activities in video format for the teaching of logics. After an analyze of the references where the focus was related to the learning of Math by means of an approaching where logics acts as a tool. It is possible to consider that there is a relevant number of researches and publishing in the area of Math education that approaches the concepts of formal logics. There is also evidences of a changing in National and State orientations for a basic education that reflects in its didactics resources and evaluations in a large scale. Even though, we can face difficulties on implementation of these proposes that is pointed out by constant critics by teachers concerning the changes in the resources and cited evaluations by the resistance of a considerable percentage of teachers to adopt the didactics materials distributed by the State and by the low performance of students in Public Schools in tests of learning