Performance Measure of Fuzzy Simple Queue with Balking and Feedback Customers using Symmetric Heptagonal Fuzzy Numbers

Ranking of generalized fuzzy numbers using distance measure and similarity measure

A Multi-Server Markovian Feedback Queue with Balking Reneging and Retention of Reneged Customers

The quality of service provides a competitive edge to any business firm. Lack of better service quality mechanism may lead to the dissatisfied customers (feedback customers). This causes loss of goodwill among the customers and finally, the firms may lose their potential customers. Further, due to long wait customers may get impatient, and may abandon the queueing system before getting service....

Comparison of fuzzy numbers using a fuzzy distance measure

A new approach for ranking fuzzy numbers based on a distance measure is introduced. A new class of distance measures for interval numbers that takes into account all the points in both intervals is developed -rst, and then it is used to formulate the distance measure for fuzzy numbers. The approach is illustrated by numerical examples, showing that it overcomes several shortcomings such as the ...

Representation and Ranking of Fuzzy Numbers with Heptagonal Membership Function Using value and Ambiguity Index

In many real life problems, the parameters used to characterize the uncertainty or vagueness or impreciseness in information are either triangular or trapezoidal fuzzy numbers. But it is not always possible to restrict the membership function to either triangular or trapezoidal form. In this paper, a new form of non-normal fuzzy number named as Heptagonal fuzzy number is introduced and its arit...

An M/G/1 Retrial Queue with Priority, Balking and Feedback Customers

We consider an M/G/1 queue with general retrial times where the blocked customers may balk the system, or join the priority queue, or enter the orbit. As soon as a customer is served, he will decide either to leave the system or join the orbit for another service in accordance with an FCFS discipline. We assume that only the customer at the head of the orbit is allowed to retry for service. We ...