Development of Priority Oriented Scheduling Method to Increase the Reliability of Manufacturing Systems

Abstract

Scheduling occurs in every organization without considering the nature of its activities. In this regard, numerous scholars have attempted to schedule via divergent methods including classical scheduling, genetic algorithm, neural network and fuzzy logic and so on. Studies in manufacturing scheduling mostly deal with priority rules without any consideration of the system states. An appropriate scheduling leads to significant enhancement of fairness in job scheduling. The term fairness can be transformed into a specific selection of job weights. There is no method of scheduling in which priority, time action (duration) and time stamp of jobs have simultaneously been considered. But the proposed method of scheduling can enhance the efficiency and reliability of manufacturing systems. To fulfill this target, first and foremost, the normalize method should be performed. This method allows data (time stamp, time action, priority) of jobs on different scales to be compared by bringing them to a common scale. Secondly, the jobs should be arranged based on three criteria which are priority, time action and time stamp. This sorting algorithm is programmed via MATLAB Distributed Computing Server (DCS) software. Eventually, to evaluate the proposed method of scheduling, simulation is operated. The simulated algorithm shows that applying the proposed method of scheduling increases the efficiency of simulated scheduler in comparison with applying the common method of scheduling. Besides the mentioned simulated algorithm, there is a mathematical proof to show the enhancement of reliability.

An Economic and Environmental Evaluation of the Em-Ferro Plastic Sorting Technology

“…The problem with weighting is that it is subject to subjectivity because the ranking system used depends on several factors such as stakeholders' values, geographical conditions, the scale that is used (Nojabaei et al, 2012). For example, the importance of the "noise" factor can be much different in an urban location compared with an out-of-town location.…”

Case Study of the Optimizing the Automotive Manufacturing Systems Efficiency via Applying New Method of Scheduling

“…A unification of both approaches seems to be more effective than each of them separately. There is no method for scheduling with considering these three criteria to enhancing the reliability of system (Nojabaei et al, 2012). The proposed method for these sensitive industrial systems can provide perfect scope in which the reliability of system will be considerably increased.…”

“…To evaluate of the mentioned algorithm (Nojabaei et al, 2012), simulation method for numerical test case and the case study of IKCO are dwelt on. Based on the simulated algorithm it would not be wrong when we come to this conclusion that reforming jobs in new queue eliminates the faults (errors) of systems which are derived from ignoring priority criteria aspects and time action of those jobs.…”

Implementation of Central Queue Based Realtime Scheduler for Multiple Source Data Streaming

“…Thus, throughput of the system is improved. The other important point to mention is that applying appropriate method of scheduling causes significant enhancement of fairness in task scheduling (Nojabaei et al, 2012).…”