This paper deals with the optimal control policy of two-phase service M X / Ek /1 queues with vacation, N-policy, server break downs and balking. Generating functions method is used to derive the system characteristics. The total expected cost function is developed to determine the optimal threshold of N at a minimum cost. Numerical experiment is performed to validate the analytical results. Th...

The objective of this paper is to find in a setting of n sequential observations of objects a good online policy to select the κ best of these n uniquely rankable objects. This focus is motivated by the fact that it is hard to find closed form solutions of optimal strategies for general κ and n. Selection is without recall, and the idea is to investigate threshold functions which maintain all p...

General elections are interpreted as a concrete manifestation of the implementation democracy in Indonesia. However, use Presidential Threshold is matter debate ahead 2024 Election. The issue related to has become hot reported by Indonesian media. media have an essential role shaping public narratives policymaking. part records can create collective awareness providing information about actors'...

After any distribution of secret sharing shadows in a threshold changeable secret sharing scheme, the threshold may need to be adjusted to deal with changes in the security policy and adversary structure. For example, when employees leave the organization, it is not realistic to expect departing employees to ensure the security of their secret shadows. Therefore, in 2012, Zhang et al. proposed ...

In an N x N shared buffer switch architecture, a common buffer space is shared among output ports, which provides flexibility in resource allocation. However the problem arises when the buffer space is dominated by one or more output ports in case of imbalanced input traffic. Thus this results in an increased packet loss rates due to unfair sharing of buffer space. For this reason buffer manage...

We study a M/Ek/1 queueing model where the service is provided in two phases one by one in secession. The server operates N-policy. Customer’s arrival rate depends on the state of the server. The service mechanism breakdowns occur only during active service and repair process may not take place immediately due to non-availability of the repair facility. We derive the steady state solutions by u...

Absfract-We a d h the pmblem of designing optimal bufYer management policies in shared memory switches when packets already accepted in the switcb can be dropped (pushed*ut). Our goal is to maximize the overall throughput, or equivalently to d n h h e the overall loss probability in the system. For a system with two output ports, we prove that the optimal policy is of push-out with threshold ty...

We consider a queueing system with c servers and a threshold type vacation policy. In this system, when a certain number d<c of servers become idle at a service completion instant, these d servers will take a synchronous vacation of random length together. After each vacation, the number of customers in the system is checked. If that number is N or more, these d servers will resume serving the ...