Vinicius Almendra

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One of the most important problems on the semantic web area is the one of trust. The growing exchange of semantic web data raises the need of policies that allow filtering out untrustworthy information. It is necessary, however , to model adequately the concept of trustworthiness, otherwise one may end up with operational trust measures that lack a clear(More)
Research dissemination in the Computer Science domain depends heavily on conference publications. The review processes of major conferences is rigorous and the work presented in those venues have more visibility and more citations than many journals, with the advantage of a faster dissemination of ideas. We consider that any evaluation system in the(More)
Online auction fraud is the most common complaint according to Internet Crime and Complaint Center. Despite that, there are not many published empirical studies about fraud occurrence in online auction sites, and the existing ones mostly target eBay. This lack of research is even worse in Latin American countries. In this paper we present the results of an(More)
Non-delivery fraud is a recurring problem at online auction sites: false sellers that list nonexistent products just to receive payments and afterwards disappear, possibly repeating the swindle with another identity. In our work we identified a set of publicly available features related to listings, sellers and product categories, and built a machine(More)
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