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Provenance, describes how a data item came to be its current state. A Directed Acyclic Graph, nature of the provenance poses challenges to access control models and querying languages. Access control policies are needed to protect the security of data provenance. In this paper, we apply proposed notions of regular expression for provenance as the structure of a provenance graph is very large. We use...
Open Provenance Model (OPM) is a provenance model that can capture provenance data in terms of causal dependencies among the provenance data model components. Causal dependencies are relationships between an event (the cause) and a second event (the effect), where the second event is understood as a physical consequence of the first. Causal dependencies can represent a set of entities that are necessary...
With the increase of distributed energy connected into power grid, the traditional power gird is changing from centralized control into interactive power system with two-way flow of information and energy. Both the distributed generation and electricity from power grid can meet the load demand of this micro-grid system. So it is quite different from the traditional dispatch model consisted of power...
Information and communication technology are the key issues of smart gird. Secondary devices, such as substation automation systems, relay protection systems, and EMS, play an important role in modern power system. A breakdown of secondary devices may result in a failure of power grid, even a large scale blackout. So it needs to evaluate risks of secondary devices for power gird operation.
As the power grid grows larger; the tradition way which relies on human's judgment to control over power grid becomes useless especially when the grid is in emergency. This paper brings in a new architecture which makes the control center smarter. This architecture uses real time data from EMS and WAMS to describe the current state of power grid. Upon the current state, different intelligent engines...
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