In this paper, we investigate the fuzzy logic based system characteristics of MX/G/1 retrial queuing system with Bernoulli vacation schedule. The service time and vacation time are assumed to be generally distributed. It is found in many practical situations that the queuing models with fuzzy parameters are much more realistic than the classical crisp parameters based queuing models. We have...

Many problems in management science and telecommunications can be solved by the analysis of a D/D/1 queueing model. In this paper, we use the zeros, both inside and outside the unit circle, of the denominator of the generating function of the model to obtain an explicit closed-form solution for the equilibrium probabilities of the number of customers in the system. The moments of the number of ...

This paper studies two stochastic bulk arrival and bulk service PH/PH/1 queue Models (A) and (B) with randomly varying k* distinct environments. The arrival and service distributions are (αi , Ti) and (βi , Si) in the environment i for 1 ≤ i ≤ k* respectively. Whenever the environment changes from i to j the arrival PH and service PH distributions change from the i version to the j version with...

The writer believes that unique interpretation of the results in the subject paper [ I ] is likely only under severely modified assumptions. The problem formulation by Chang centers on ' 6. .. a multi-server system with c servers. " In the absence of details regarding the service discipline, there is a temptation to assume that immediate service is given each new arrival if one or more of the c...

This paper studies two stochastic bulk arrival and bulk service queueing Models (A) and (B) with k varying environments. The system has infinite storing capacity and the arrival and service sizes are finite valued random variables. Matrix partitioning method is used to study the models. In Model (A) the maximum of the arrival sizes in all environments is greater than the maximum of the service ...

This paper points out a phase effect with REDlike queue management algorithms and two-way TCP traffic. It is shown by simulation and measurement that the RED queue converges to a state of heavy oscillation in the presence of two-way bulk-data TCP traffic, causing suboptimal link utilization and service differentiation between in-profile and out-of-profile packets. Besides investigating the reas...

This paper analyzes a discrete-time finite-buffer multi-server bulk-service queueing system in which the interarrival-and service-times are, respectively, arbitrarily and geometrically distributed. Using the supplementary variable and the imbedded Markov-chain techniques, the queue is analyzed for the early arrival system. We obtain state probabilities at prearrival, arbitrary and outside obser...