Ontology Based Data Access (OBDA) is the provision of data access and integration as a result mapping that established between an ontology source. Thus, storing large amounts becomes easier, more powerful queries can be written, management complex information systems performed quickly effectively by using Semantic Web technologies. Control (OBAC) uses technologies to enable enforcement control ...

  The primary characteristic of an Ultra-Large-Scale (ULS) system is ultra-large size on any related dimension. A ULS system is generally considered as a system-of-systems with heterogeneous nodes and autonomous domains. As the size of a system-of-systems grows, and interoperability demand between sub-systems is increased, achieving more scalable and dynamic access control system becomes an im...

Ontology-based Data Access (OBDA) is gaining importance both scientifically and practically. However, little attention has been paid so far to the problem of updating OBDA systems. This is an essential issue if we want to be able to cope with modifications of data both at the ontology and at the source level, while maintaining the independence of the data sources. In this paper, we propose mech...

Data, information, and knowledge are dramatically increasing (Korth & Silberschatz, 1997; Naydenova & Kaloyanova, 2010). Although, Data Warehouses are a central access for business data since the 90s, new technologies have to be considered to achieve an efficient access and processing of these multidimensional data. Recently, new architectures have evolved that try to optimize data access for c...

Provenance and other metadata are essential for determining ownership and trust. Nevertheless, no systematic approaches were introduced so far in the Linked Data publishing workflow to capture them. Defining such metadata remained independent of the rdf data generation and publishing. In most cases, metadata is manually defined by the data publishers (person-agents), rather than produced by the...

Today, vehicular Ad-hoc Network between automobiles has been accepted by the public, and many people are interested in exchanging information with other vehicles as well as with roadside equipment while driving. When a number of vehicles want to access to the data stored in RSU ,the priority of servicing comes into face .In this case, some  methods, such as D*S, D*S/N,  have been presented ...