RBAC model is renowned as a security model for corporate environment, since its components, especially role hierarchy, are suitable for modeling an organization structure. But the functional role hierarchy constructed through the existing role engineering approaches does not reflect an organization structure, because they do not take the structural characteristics of the organization into accou...

In this paper, we present an enhanced use of RBAC features in articulating a security policy for access control in medical database systems. The main advantage of this implementation is that it supports both MAC and DAC features at the same time; a feature that has been proved to be necessary in healthcare environments. The eMEDAC security policy that results from the above implementation provi...

This paper introduces the notion of safety and availability checking for user authorization query processing, and develop a recursive algorithm use the ideas from backtracking-based search techniques to search for the optimal solution. For the availability checking, we introduce the notion of max activatable set (MAS), and show formally how MAS can be determined in a hybrid role hierarchy. For ...

Access control is a difficult security issue for enterprise organizations. Role-based access control (RBAC) model is well known and recognized as a good security model for enterprise environment. Though RBAC is a good model, administration of RBAC including building and maintaining access control information remains a difficult problem in large companies. RBAC model itself does not tell the sol...

Some consider assessment in terms of a systematic way of gathering and evaluating information within educational system and particularly higher education. Since, the term ‘’assessment’’ refers and relates to administrative processes, this paper has shed light some consideration on how it can benefit the members of department and program. Program assessment ultimately emphasizes on direction for...

the purpose of was segmentation of customers according to benefit sought. market segmentation is viewing a heterogeneous market as a number of smaller homogeneous markets, in response to differing preferences, attributable to the desires of customers for more precise satisfaction of their varying wants. the data analysis was based on questionnaires which had been gathered from three metropolise...