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To study data dependencies over the data in schema transformation between data and metadata (DM-transformation for short), we define a general dependency form, namely pivot dependency (PD for short), which specifies constraints not only on values but also on names of attribute and relation. PDs, an extension to conventional FDs, formalize constraints in context that data and metadata are treated uniformly...
Worst-case execution time (WCET) analysis is one of the major tasks in timing validation of hard real-time systems. In complex systems with real-time operating systems (RTOS), the timing properties of the system are decided by both the applications and the RTOS. Traditionally, WCET analysis mainly deals with application programs, while it is crucial to know whether the RTOS also behaves in a timely...
Timing correctness of hard real-time systems is guaranteed by schedulability analysis and worst-case execution time (WCET) analysis of programs. Traditional WCET analysis mainly deals with application programs and has achieved success in industry. Timing analysis of application programs along cannot guarantee correctness of complete systems consisting RTOS. WCET tools designed for application program...
As the wide uses of access control model in systems, a more agile access control model is required to solve complicated modeling, user authorizing and verifying problem. In this paper, an access control model based on the concepts of role, attribute and context, named C-RBAC, is proposed. This model is based on and further improved role-based access control (RBAC). The proposed model adds system conditions...
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