Sharif Digital Repository

The high penetration of residential air conditioners (RACs) poses a growing concern in emerging fault-induceddelayed voltage recovery (FIDVR) in power systems. FIDVR is expected to be a significant threat to the stability and reliability offuture power grids. Hence, the system planners should carry out appropriate simulation studies to mitigate the severeconsequences of FIDVR events. A key question to implement these studies is how to determine the worst condition whichresults in FIDVR. Most of the actual FIDVR events have been experienced in the hot hours of the day and this issue makes onecurious to think about the relationship between the FIDVR events and the ambient temperature. In this... 

Using the first-principles procedure of density-functional-theory within tight-binding approximation and nonequilibrium Green's function formalism, this paper reports on the impact of vacancy defects on the structural, electronic and transport properties of hydrogen-passivated graphene atomic sheet. After the introduction of vacancy defects in graphene atomic sheet passivated with hydrogen atoms, apart from increase in band gap, a suppression is noted in the intensity of transmission channels and density of states arising from the long array deformations of the graphene sheet and a corresponding shift of the Fermi level. This in turn decreases the conductance of the defected graphene atomic... 

In order to overcome the shortcomings of the recent frameworks and mechanisms for semantic-based access control, this paper presents a semantic-based, context-aware, and multi-domain enabled framework implementing a semantic-based access control mechanism for Semantic Web. The access control framework is based on the MA(DL)2 model, which takes the semantic relationships among different entities into account. The framework handles the Semantic Web context by classifying and representing it through an ontology. Considering the MA(DL)2 model, the framework assumes SemanticWeb having some overlapped domains, which each contains an authority and a security agent. As a domain authority...