Universal Journal of Industrial and Business Management(CEASE PUBLICATION) Vol. 2(3), pp. 61 - 68
DOI: 10.13189/ujibm.2014.020301
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Comparison of SCONWIP, DCONWIP, TOC and CWIPL II in Job Shop

Nasim Nahavandi ^*
Industrial Eng. Dept., Tarbiat Modares University, Tehran, Iran

ABSTRACT

Critical WIP Loop II (CWIPL II) is a control mechanism previously proposed for unbalance flow line. The purpose of this paper is show how to apply CWIPL II in job shop and then comparing it with Theory of Constraint (TOC), Dedicated CONWIP (DCONWIP) and Shared CONWIP (SCONWIP). The Performance measures considered are average throughput, average lead time, average tardiness time and percent of tardy. Two set of examples are simulated. At First set, each job has a bottleneck that is not bottleneck for other jobs. Simulation results and statistical tests demonstrates that CWIPL II has better lead time and throughput compared to TOC and CWIPL II has better or the same due date compared to TOC. TOC works better than DCONWIP for all performance measures and DCONWIP is better than SCONWIP for average throughput lead time and tardiness time while DCONWIP and SCONWIP are the same for percent of tardy. At second set, single machine is bottleneck for all jobs. So the Job shop has one bottleneck. In this set, TOC has better lead time, tardiness and percent of tardy compared to CWIPLII, DCONWIP and SCONWIP with the same throughput.

KEYWORDS
Job Shop, CONWIP, TOC, CWIPL II, Throughput, Due Date Performance

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Nasim Nahavandi , "Comparison of SCONWIP, DCONWIP, TOC and CWIPL II in Job Shop ," Universal Journal of Industrial and Business Management(CEASE PUBLICATION), Vol. 2, No. 3, pp. 61 - 68, 2014. DOI: 10.13189/ujibm.2014.020301.

(b). APA Format:
Nasim Nahavandi (2014). Comparison of SCONWIP, DCONWIP, TOC and CWIPL II in Job Shop . Universal Journal of Industrial and Business Management(CEASE PUBLICATION), 2(3), 61 - 68. DOI: 10.13189/ujibm.2014.020301.