At this time there are 37 demographic surveillance system sites active in sub-Saharan Africa, Asia and Central America, and this number is growing continuously. These sites and other longitudinal ...

Abstract: Extensible markup language (XML) is nowadays one of the most important standards for web information management and complex data representation. Massive Data is still treated, tagged and ...

Abstract: The paper presents a discretionary access control model in which authorizations contain temporal intervals of validity. An authorization is automatically revoked when the associated temporal ...