In this paper a conceptually simple structural object model focusing on object types, attributes and ISA relationships is introduced. The model is derived mainly from an extended Entity-Relationship approach, but concepts from other semantic and object-oriented models have innuenced its features. It is shown how high-level conceptual data models can be mapped to this model, and to what extent t...

Cloud is a virtualized server pool which can provide the different computing resources of their user’s. In cloud computing, the data will be stored in storage provided by CSP (Cloud service Provider). Service providers must have a feasible way to protect their user’s data, especially to prevent the data from disclosure by Malicious Insiders. This paper also illustrated the data privacy problem ...

Formulating non-trivial queries in relational languages such as SQL and QBE can prove daunting to end users. ConQuer is a conceptual query language that allows users to formulate queries naturally in terms of elementary relationships, operators such as “and”, “or”, “not” and “maybe”, contextual for-clauses and object-correlation, thus avoiding the need to deal explicitly with implementation det...

AbstractReconciling Software Product Lines (SPL) and Service Oriented Architecture (SOA) allows modeling and implementing systems that systematically adapt their behavior in respond to surrounding context changes. Both approaches are complementary with regard to the variability and the dynamicity properties. Architecture Description Language (ADL), on the other hand, is recognized as an importa...

Even with the help of present schema design tools (e.g. graphical editors, EER model techniques, etc) the task of constructing any non-trival object oriented database schema (OODB) is immense. This paper describes a system, TYPSYS, which automatically produces a type hierarchy from information about the leaf object types (types at leaf level of the hierarchy) which are visible from the database...