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- O GeoGebra na aprendizagem do tema “Circunferência” – um estudo com alunos do 9.ºano de escolaridadePublication . Domingues, Ana Luísa Paulo; Menino, Hugo Alexandre Lopes
- A construção da autonomia no uso das TIC : avaliar o impacto das tutorias entre pares no 1.º cicloPublication . Alvega, Maria Fernanda Ramos Nico; Pereira, Maria Isabel Alves Rodrigues
- Concept Drift Awareness in Twitter StreamsPublication . Costa, Joana; Silva, Catarina; Antunes, Mario; Ribeiro, BernardeteLearning in non-stationary environments is not an easy task and requires a distinctive approach. The learning model must not only have the ability to continuously learn, but also the ability to acquired new concepts and forget the old ones. Additionally, given the significant importance that social networks gained as information networks, there is an evergrowing interest in the extraction of complex information used for trend detection, promoting services or market sensing. This dynamic nature tends to limit the performance of traditional static learning models and dynamic learning strategies must be put forward. In this paper we present a learning strategy to learn with drift in the occurrence of concepts in Twitter. We propose three different models: a time-window model, an ensemble-based model and an incremental model. Since little is known about the types of drift that can occur in Twitter, we simulate different types of drift by artificially timestamping real Twitter messages in order to evaluate and validate our strategy. Results are so far encouraging regarding learning in the presence of drift, along with classifying messages in Twitter streams.