Percorrer por autor "Pereira, Rafael"
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- Physical activity and body image in physiotherapy studentsPublication . Santos, Paula Clara; Pereira, Rafael; Lopes, Sofia; Mesquita, CristinaThere is a decrease in the physical activity of future physiotherapists, due to readjustments after admission to college. The high levels of sedentarism, cause diverse physical consequences, especially in terms of corporal image perception. This fact is due to a multidimensional construction of several psychosocial factors, which include motivational factors and behavioural changes.
- Strategic Bidding for Electricity Markets Negotiation Using Support Vector MachinesPublication . Pereira, Rafael; Sousa, Tiago; Pinto, Tiago; Praça, Isabel; Vale, Zita; Morais, HugoEnergy systems worldwide are complex and challenging environments. Multi-agent based simulation platforms are increasing at a high rate, as they show to be a good option to study many issues related to these systems, as well as the involved players at act in this domain. In this scope the authors’ research group has developed a multi-agent system: MASCEM (Multi- Agent System for Competitive Electricity Markets), which simulates the electricity markets environment. MASCEM is integrated with ALBidS (Adaptive Learning Strategic Bidding System) that works as a decision support system for market players. The ALBidS system allows MASCEM market negotiating players to take the best possible advantages from the market context. This paper presents the application of a Support Vector Machines (SVM) based approach to provide decision support to electricity market players. This strategy is tested and validated by being included in ALBidS and then compared with the application of an Artificial Neural Network, originating promising results. The proposed approach is tested and validated using real electricity markets data from MIBEL - Iberian market operator.