Dependence among single stations in series and its applications in productivity improvement

Kan Wu and Ning Zhao

European Journal of Operational Research, 2015, vol. 247, issue 1, 245-258

Abstract: Theory of constraints has been commonly used in production systems to improve productivity. Since the improvement on an upstream workstation may have impact on its downstream servers, finding the true bottleneck is not trivial in a stochastic production line. Due to the analytical intractability of general tandem queues, we develop methods to quantify the dependence among stations through simulation. Dependence is defined by the contribution queue time at each station, and contribution factors are developed based on the insight from Friedman's reduction method and Jackson networks. In a tandem queue, the dependence among stations can be either diffusion or blocking, and their impact depends on the positions relative to the bottlenecks. Based on these results, we show that improving the performance of the system bottleneck may not be the most effective place to reduce system cycle time. Rather than making independence assumptions, the proposed method points out a promising direction and sheds light on the insights of the dependence in practical systems.

Keywords: Productivity; Simulation; Theory of constraint; Tandem queue (search for similar items in EconPapers)
Date: 2015
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:ejores:v:247:y:2015:i:1:p:245-258

DOI: 10.1016/j.ejor.2015.05.028

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