Nuno Costa

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Sensor networks have been referred to as part of the background infrastructure required to achieve ubiquitous computing. This has recently promoted a considerable amount of attention from the research community that concluded that existing protocols and techniques for service discovery, such as JINI or UPnP are not suitable for the case of resource poor,(More)
Novel approaches have taken Augmented Reality (AR) beyond traditional body-worn or hand-held displays, leading to the creation of a new branch of AR: Spatial Augmented Reality (SAR) providing additional application areas. SAR is a rapidly emerging field that uses digital projectors to render virtual objects onto 3D objects in the real space. When mounting(More)
We construct a generalization of the multiplicative product of distributions presented by L. Hörmander in [L. Hörmander, The analysis of linear partial differential operators I (Springer-Verlag, 1983)]. The new product is defined in the vector space A(R) of piecewise smooth functions f : R → C and all their (distributional) derivatives. It is associative,(More)
After a contextualization of mobile applications, this paper presents a approach for real-time mobile application development. Through the presented approach it is proposed to use different hardware components and technologies accessible in mobile devices, namely WIFI, GSM, sensors as well as colored Petri nets for modeling the behavior of the system.
The Protégé plug-in NoHR allows the user to combine an OWL 2 EL ontology with a set of nonmonotonic (logic programming) rules – suitable, e.g., to express defaults and exceptions – and query the combined knowledge base (KB). The formal approach realized in NoHR is polynomial (w.r.t. data complexity) and it has been shown that even very large health care(More)
The Protégé plug-in NoHR, which allows the user to combine an OWL 2 EL ontology with a set of non-monotonic (logic programming) rules – suitable e.g. to express defaults and exceptions – and query the combined knowledge base (KB), has recently been extended to OWL 2 QL in a non-trivial way. In this paper, we showcase this extension using an OWL 2 QL version(More)