Data integration is the process of unifying data sharing some common semantics but are originated from unrelated sources. In our work we consider these sources are autonomous, heterogeneous and they are physically distributed. These three characteristics make the integration task…

Time and change are notions that seems unavoidable in some areas of work and investigation, languages that can deal with these notions are necessary. At the same time, methods for a proper time handling are quite complex, mainly because problem’s…

El objetivo del proyecto Portal da Língua Portuguesa es construir, con un doble
objetivo, un juego de recursos léxicos. En primer lugar, estos recursos sirven como fuente de
información para una página web sobre la lengua portuguesa para el público…

This paper shows models of data description that incorporate uncertainty like models of data extension EER, IFO among others. These database modeling tools are compared with the pattern FuzzyEER proposed by us, which is an extension of the EER model…

THE DISASTERS CAUSED BY NATURAL PHENOMENA HAVE BEEN PRESENT ALL ALONG HUMAN HISTORY; NEVERTHELESS, THEIR CONSEQUENCES ARE GREATER EACH TIME. THIS TENDENCY WILL NOT BE REVERTED IN THE COMING YEARS; ON THE CONTRARY, IT IS EXPECTED THAT NATURAL PHENOMENA WILL…

Nowadays, data intensive applications are in constant demand and there is need of computing environments with better intelligent capabilities than those present in today's Database Management Systems (DBMS). To build such systems we need formalisms that can perform complicate inferences,…

A Federated System is a collection of independent, cooperative, possibly heterogeneous and autonomous computer systems (usually database systems) which allows sharing all or some of its data. A Service-oriented Architecture is an application architecture whose functionalities are defined as independent…