This paper considers the equilibrium balking behavior of customers in a single-server Markovian queue with variable vacation and interruption, where server can switch across four states: vacation, working idle period, busy period. Once becomes empty, commences slows down its service rate. However, this period may be interrupted anytime by interruption. Upon completion takes probability-based ma...

Current security governance is often based on a centralized decision making model and still uses an ineffective 20th century risk management approach to security. This approach is relatively simple to manage since it needs almost no security governance below the top enterprise level where most decisions are made. However, while there is a role for more corporate governance, new regulations, and...

according to the rules of quadruplet relations between concepts, muslim logicians have proved that relation between the negations of two concepts which are equal (musawi) or absolute-general-and-specific (‘amm wa khas-e mutlaq) are, respectively, equal and absolute-specific-and-general; but these rules come across some problems when the most inclusive concepts are involved, since the negation o...