Otimização com restrições de complementaridade: algoritmos e aplicações

Tese de Doutoramento em Engenharia Industrial e de Sistemas (PDEIS)

A multi-criteria decision support system for a routing problem in waste collection

Autor proof

A decision support system for a waste collection vehicle routing problem

The selective collection of municipal solid waste for recycling is a very complex and expensive process, where a major issue is to perform cost-efficient waste collection routes. Despite the abundance of commercially available software for fleet management, they often lack the capability to deal properly with sequencing problems and dynamic revision of plans and schedules during process execution. Our approach to achieve better solutions for the waste collection process is to model it as a vehicle routing problem, more specifically as a team orienteering problem where capacity constraints on the vehicles are considered, as well as time windows for the waste collection points and for the vehicles. The final model is called capacitated team orienteering problem with double time windows (CTOPdTW).We developed a genetic algorithm to solve routing problems in waste collection modelled as a CTOPdTW. The results achieved suggest possible reductions of logistic costs in selective waste collection.

Pensar, testar, opinar e construir: a resolução de problemas no jardim de infância e primeiro ciclo

Relatório de estágio de mestrado em Educação Pré-Escolar e Ensino do 1.º Ciclo do Ensino Básico

Kinematic joints constraints

"Series title: Springerbriefs in applied sciences and technology, ISSN 2191-530X"

Performance of a fly ash geopolymeric mortar for coating of ordinary portland cement concrete exposed to harsh chemical environments

Premature degradation of ordinary Portland cement (OPC) concrete infrastructures is a current and serious problem with overwhelming costs amounting to several trillion dollars. The use of concrete surface treatments with waterproofing materials to prevent the access of aggressive substances is an important way of enhancing concrete durability. The most common surface treatments use polymeric resins based on epoxy, silicone (siloxane), acrylics, polyurethanes or polymethacrylate. However, epoxy resins have low resistance to ultraviolet radiation while polyurethanes are sensitive to high alkalinity environments. Geopolymers constitute a group of materials with high resistance to chemical attack that could also be used for coating of concrete infrastructures exposed to harsh chemical environments. This article presents results of an experimental investigation on the resistance to chemical attack (by sulfuric and nitric acid) of several materials: OPC concrete, high performance concrete (HPC), epoxy resin, acrylic painting and a fly ash based geopolymeric mortar. Three types of acids, each with high concentrations of 10%, 20% and 30%, were used to simulate long term degradation by chemical attack. The results show that the epoxy resin had the best resistance to chemical attack, irrespective of the acid type and acid concentration.

Monitoring and analysis of queries in distributed databases

Dissertação de Mestrado em Engenharia Informática

Desenvolvimento de sistema de alarmes para incontinentes

Dissertação de mestrado em redes e serviços telemáticos

Análise da disponibilidade de investimento em projetos de reabilitação portugueses

The importance of implementing sustainable practices in buildings is duly proved and understood by the majority of the population. However, its implementation is not yet a reality. Some studies have been performed with the goal of understand this lack of use of sustainable solutions, among building sector stakeholders. The conclusion is that one of the main factors contributing to this is related with economic constraints. Several studies have proven that many sustainable practices correspond to minor costs than traditional practices in a life cycle perspective. However, the building sector stakeholders are not aware of this and do not implement sustainable practices commonly. In this paper a costâ benefit methodology willing to cross this barrier and promote the sustainable practices implementation is presented.

Abstract computation in schizophrenia detection through artificial neural network based systems

Schizophrenia stands for a long-lasting state of mental uncertainty that may bring to an end the relation among behavior, thought, and emotion; that is, it may lead to unreliable perception, not suitable actions and feelings, and a sense of mental fragmentation. Indeed, its diagnosis is done over a large period of time; continuos signs of the disturbance persist for at least 6 (six) months. Once detected, the psychiatrist diagnosis is made through the clinical interview and a series of psychic tests, addressed mainly to avoid the diagnosis of other mental states or diseases. Undeniably, the main problem with identifying schizophrenia is the difficulty to distinguish its symptoms from those associated to different untidiness or roles. Therefore, this work will focus on the development of a diagnostic support system, in terms of its knowledge representation and reasoning procedures, based on a blended of Logic Programming and Artificial Neural Networks approaches to computing, taking advantage of a novel approach to knowledge representation and reasoning, which aims to solve the problems associated in the handling (i.e., to stand for and reason) of defective information.

Estudo do comportamento tribológico de materiais compósitos à base de titânio reforçado com partículas cerâmicas para aplicação em implantes articulares

Dissertação de mestrado integrado em Engenharia Biomédica

O uso de Charges como instrumento para identificação de concepções individuais e representações sociais sobre a Dengue

A dengue é hoje uma das doenças com maior incidência no Brasil, com especial frequência no município de Fênix –Paraná. No presente estudo pretendeu-se analisar as concepções que as crianças têm sobre a dengue, identificando os componentes do modelo KVP, bem como conhecer as representações sociais deste grupo. Para o efeito optou-se pela utilização de charges com alunos do 5º ano do ensino fundamental de uma escola localizada no município de Fênix, cujos textos foram analisados para identificação de categorias e dos componentes do modelo KVP (conhecimentos, valores e práticas) a elas associadas. Foram identificadas quatro categorias de respostas sobre a interpretação da charge relativa à dengue: (i) prevenção da dengue, (ii) perigoso que pode levar à morte, (iii) problema de saúde pública e (iv) combater a dengue. Verificou-se que a “prevenção da dengue” foi a categoria em que se identificaram os três domínios K, V e P implicados na construção das concepções, enquanto as duas categorias “perigoso que pode levar à morte” e “problema de saúde pública” apresentaram apenas os domínios K e V, e a categoria “combater a dengue” apenas evidenciou o domínio V. Os resultados do estudo mostraram que os alunos já veem a dengue como um problema com consequências sérias e que todos têm sua responsabilidade no controle da doença. Percebe-se, portanto, que todo o trabalho que vem sendo realizado pela secretaria de saúde, pelas escolas ou campanhas publicitárias esta surtindo efeito, uma vez que no ano de 2014 houve uma redução do número de casos no município foco da pesquisa.