Encontrados 28 documentos, a visualizar página 1 de 3
Reutilização de resíduos da construção e demolição em obras aeroportuárias
Matias, João Luís Banza GonçalvesNo presente trabalho foi feito um estudo sobre a utilização de Resíduos da Construção e Demolição (RCD) em Infraestruturas Aeroportuárias na camada de Leito de Pavimento. Esta dissertação teve como base de partida um caso de estudo real, onde foi efetuada a comparação entre a solução convencional inicialmente prevista para a camada de leito de pavimento e a uma outra solução com a utilização de RCD. Na análise ...
Responsabilidade social nas PMEs : potencial estratégico da responsabilidade so...
Matias, João Pedro SilvaDesde meados do século XX, Responsabilidade Social tem sido um tema de debate crescente e frequentemente pouco consensual, recolhendo quer apoiantes quer adversários nos mais diversos meios, não só a nível das empresas como da sociedade em geral. Esta temática surgida de escândalos geradores de pressões sociais sobre as empresas, tem provocado um intenso debate, propulsionador de resultados muitas vezes dúbios ...
A Java expression evaluator for nonlinear programming
Matias, João; Correia, Aldina; Serôdio, Carlos; Teixeira, C.; Mestre, PedroFinding the optimal value for a problem is usual in many areas of knowledge where in many cases it is needed to solve Nonlinear Optimization Problems. For some of those problems it is not possible to determine the expression for its objective function and/or its constraints, they are the result of experimental procedures, might be non-smooth, among other reasons. To solve such problems it was implemented an API...
Solving a signalized traffic intersection problem with NLP solvers
Melo, Teófilo; Matias, João; Monteiro, M. Teresa T.Mathematical Programs with Complementarity Constraints (MPCC) finds many applications in areas such engineering design, economic equilibrium and mathematical theory itself. In this work we consider a queuing system model resulting from a single signalized traffic intersection regulated by pre-timed control in an urban traffic network. The model is formulated as an MPCC problem and may be used to ascertain the o...
Numerical optimization experiments using the hyperbolic smoothing strategy to s...
Melo, Teófilo; Matias, João; Monteiro, M. Teresa T.In this work we solve Mathematical Programs with Complementarity Constraints using the hyperbolic smoothing strategy. Under this approach, the complementarity condition is relaxed through the use of the hyperbolic smoothing function, involving a positive parameter that can be decreased to zero. An iterative algorithm is implemented in MATLAB language and a set of AMPL problems from MacMPEC database were tested.
Numerical experiments with a modified regularization scheme for mathematical pr...
Melo, Teófilo; Matias, João; Monteiro, M. Teresa T.On this paper we present a modified regularization scheme for Mathematical Programs with Complementarity Constraints. In the regularized formulations the complementarity condition is replaced by a constraint involving a positive parameter that can be decreased to zero. In our approach both the complementarity condition and the nonnegativity constraints are relaxed. An iterative algorithm is implemented in MATLA...
Percepções da comunidade escolar quanto à liderança exercida em escolas públic...
Matias, João Demony D’Eça LourençoDissertação submetida como requisito parcial para obtenção do grau de Mestre em Administração Escolar, ramo Direcção e Gestão Escolar ; O estudo em causa prende-se com a liderança exercida em quatro escolas portuguesas, duas públicas e duas privadas. A liderança é tida como uma peça chave no funcionamento de uma organização, na qual estão presentes relações de poder e autoridade, bem como inúmeros canais de co...
Penalty fuzzy function for derivative-free optimization
Matias, João; Mestre, Pedro; Correia, Aldina; Couto, Pedro; Serôdio, Carlos; Melo-Pinto, P.Penalty and Barrier methods are normally used to solve Nonlinear Optimization Problems constrained problems. The problems appear in areas such as engineering and are often characterised by the fact that involved functions (objective and constraints) are non-smooth and/or their derivatives are not know. This means that optimization methods based on derivatives cannot net used. A Java based API was implemented, i...
Indoor location using fingerprinting and fuzzy logic
Mestre, Pedro; Coutinho, Luis; Reigoto, Luis; Matias, João; Correia, Aldina; Couto, Pedro; Serôdio, CarlosIndoor location systems cannot rely on technologies such as GPS (Global Positioning System) to determine the position of a mobile terminal, because its signals are blocked by obstacles such as walls, ceilings, roofs, etc. In such environments. The use of alternative techniques, such as the use of wireless networks, should be considered. The location estimation is made by measuring and analysing one of the param...
A lightweight indoor localization model based on motley-keenan and COST
Serôdio, Carlos; Coutinho, Luis; Reigoto, Luis; Matias, João; Correia, Aldina; Mestre, PedroThis paper presents a novel approach to WLAN propagation models for use in indoor localization. The major goal of this work is to eliminate the need for in situ data collection to generate the Fingerprinting map, instead, it is generated by using analytical propagation models such as: COST Multi-Wall, COST 231 average wall and Motley- Keenan. As Location Estimation Algorithms kNN (K-Nearest Neighbour) and WkNN ...
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