Leonardo Carvalho

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This paper presents a model to enrich an ontology with a thesaurus based on a domain corpus and WordNet. The model is applied to the data privacy domain and the initial domain resources comprise a data privacy ontology, a corpus of privacy laws, regulations and guidelines for projects. Based on these resources, a thesaurus is automatically generated. The(More)
—In this paper we present a method to simulate fluids on smooth surfaces of arbitrary topology using a graphics processing unit (GPU). To do this we use the parametrization of Catmull-Clark subdivision surfaces, and obtain the metric information of the distortion caused by this parametrization, so we can calculate differential operators of functions defined(More)
Modelling student knowledge is a big challenge for online learning environments(OLEs). One of the state-of-the-art models is the Bayesian Knowledge Tracing (BKT), which estimates the probability of a student having learned a knowledge concept (KC) based on observable item answers over time. Nevertheless, BKT is based on a few assumptions that some(More)
Apart from their role in hemostasis and thrombosis, platelets are involved in many other biological processes such as wound healing and angiogenesis. Percutaneous coronary intervention is a highly thrombogenic procedure inducing platelets and monocytes activation through endothelial trauma and contact activation by intravascular devices. Platelet P2Y12(More)
Cellular Automata are discrete dynamical systems that evolve following simple and local rules. Despite of its local simplicity, knowledge discovery in CA is a NP problem. This is the main motivation for using data mining techniques for CA study. The Principal Component Analysis (PCA) is a useful tool for data mining because it provides a compact and optimal(More)
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