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INTERDISCIPLINARY JOURNAL OF CONTEMPORARY RESEARCH IN BUSINESS
JUNE 2011
VOL 3, NO 2
last of the two cells in a loop. With CONWIP, an authorization to produce the next batch is
produced when another batch is removed from inventory, regardless of the product type. DBR is
a system in which the master schedule sets the production rate according to the output rate of the
bottleneck resource. Researchers have extensively studied pull strategies; Tayur (1993)
developed theoretical results to characterize the dynamics of kanban systems and reduce the
simulation effort needed to study them. Gstettner and Kuhn (1996) show that the performance of
a kanban system is significantly affected by the distribution of kanban cards.
Figure 1. Push versus Pull System
In the Push scheme each time a demand arrives it immediately authorizes the release of a new
job. The demand is either immediately satisfied from the stock or it is backloged. The Pull
scheme examined is similar to CONWIP (Spearman,1992 ; Spearman et al., 1990 ;
Spearman&Zazanis,1992). The main difference is that instead of the requirement that the WIP in
the system remain constant we require that the total work-in-process including the Finished
Goods Inventory (FGI) remain constant and equal to S. External demands, if not immediately
satisfied, are again backloged. In this scheme the arrival of a demand authorizes the release of a
new job only when the work in process is less than S or equivalently the finished goods
inventory is greater than zero. Proper operation of this scheme, which of course depends
crucially upon the right choice for S, results in the same benefits in terms of increased system
control as other pull systems (Buzacott&Shanthikumar,1993 ; Hall,1983 ; Karmarkar ,1986 ;
Mitra&Mitrani,1990 ; Mitra&Mitrani,1991 ; Spearman et al.,1990 ; Spearman&Zazanis,1992).
2.3.Push/Pull Interface
It is not necessary that a production line be pure push or pure pull. One can design a line so that
a segment of the line operates as push and the another segment operates as pull. We present a
specific example to illustrate this.
2.4.Electronics assembly case in Iran industry
An actual push design electronics assembly system was modeling using the SIMAN
simulation language. The simulation model was a representation of a real electronics assembly
facility prototype line, producing one product style in high volume. Although the prototype
production line is very simple, the case provides an adequate demonstration of these research
methods.
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