Evaluation of fuzzy non-preemptive priority queues in intuitionistic pentagonal fuzzy numbers using centroidal approach

This article provides an effective method to analyze the performance measures of non-preemptive fuzzy priority queues with unequal service rates. Here the arrival rate and the service rate are in fuzzy numbers. Using a new ranking method, the fuzzy values are reduced to the crisp values. For that cause, both the Triangular Fuzzy Number (TFN) and Trapezoidal Fuzzy Number (TpFN) are chosen to establish the proposal's effectiveness. An illustration is given to find the efficiency of the performance measures of the fuzzy queuing model.

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M/G/1 Preemptive Priority Queues With Finite and Infinite Buffers

Journal of Society of Korea Industrial and Systems Engineering ◽

10.11627/jkise.2020.43.4.001 ◽

2020 ◽

Vol 43 (4) ◽

pp. 1-14

Author(s):

Kilhwan Kim

Keyword(s):

Priority Queues ◽

Preemptive Priority

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Social welfare and price of anarchy in preemptive priority queues

Operations Research Letters ◽

10.1016/j.orl.2020.05.015 ◽

2020 ◽

Vol 48 (4) ◽

pp. 530-533 ◽

Cited By ~ 1

Author(s):

Jonathan Chamberlain ◽

David Starobinski

Keyword(s):

Social Welfare ◽

Price Of Anarchy ◽

Priority Queues ◽

Preemptive Priority

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Enhanced Two-Step Method via Relaxed Order ofα-Satisfactory Degrees for Fuzzy Multiobjective Optimization

Mathematical Problems in Engineering ◽

10.1155/2014/867836 ◽

2014 ◽

Vol 2014 ◽

pp. 1-11

Author(s):

Na Wang ◽

Chaofang Hu ◽

Wuxi Shi ◽

Chunbo Xiu ◽

Yimei Chen

Keyword(s):

Multiobjective Optimization ◽

Set Theory ◽

Optimization Problem ◽

Fuzzy Numbers ◽

Fuzzy Relations ◽

Preemptive Priority ◽

Step Method ◽

Satisfactory Solution ◽

Order Constraint ◽

Fuzzy Parameters

An enhanced two-step method via relaxed order of satisfactory degrees for fuzzy multiobjective optimization is proposed in this paper. By introducing the concept of fuzzy numbers andα-level set theory, fuzzy parameters are taken as variables, and all the objectives are transformed into fuzzy goals involving three fuzzy relations. The order ofα-satisfactory degrees which means the objectives with higher priority achieving higher satisfactory degree is applied to model preemptive priority requirement. This strict order constraint is relaxed by priority variable to find the preferred solution satisfying optimization and priority. The original optimization problem is divided into two steps to be solved iteratively. The M-α-Pareto optimality of the solution is ensured, and the satisfactory solution can be acquired by regulating the slack parameterΔδor changingα. The numerical examples demonstrate the power of the proposed method.

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APPLICATION OF NON PREEMPTIVE PRIORITY QUEUING FOR BASRAH COMMERCIAL PORTS

Al-Qadisiyah Journal Of Pure Science ◽

10.29350/jops.2019.24.3.967 ◽

2019 ◽

Vol 24 (3) ◽

Author(s):

Huda Zaki Naji ◽

Suaad Abdul Razzaq ◽

, Samaher Adnan

Keyword(s):

Sustainable Development ◽

Waiting Time ◽

Priority Queues ◽

Preemptive Priority ◽

Multiple Servers

Waiting for commercial vessels inside the port is one of the most important problems facing traders and offshore companies, which often lead to material losses. The ports of Basrah are characterized by continuous congestion, which leads to the diversion of ships to the ports of the neighboring countries, causing the loss of many revenues to the country. This paper emphasizes the importance of non-preemptive priority queues (with multiple servers and multiple priority classes) to the problem of congestion of ports in order to promote sustainable development of the ports of Basrah. The aim of this paper is to apply a non-preemptive priority queues at ports of Basrah and calculating the average customer waiting time for the ships at berths.

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