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< previous page page_73 next page > Page 73 M.KL = DI.K/MC (4.6) where MC is a manufacturing constant that recognises manufacturing cannot simply be switched on and off, experiencing in reality time delays ( M.KL 0). The set of equations that can be drawn up to represent Figure 4.5 is now summarised MC = a constant relating to the manufacturing process (4.7) DSL = a constant determined by management (4.8) D.KL = a variable determined outside the model (4.9) M.KL = DI.K/MC (4
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.10) DI.K = DSL - SL.K (4.11) SL.K = SL.J + DT(M.JK - D.JK) (4.12) Of course, we could improve this model in many ways. For example, the demand indicator ( DI ) in Equation 4.11 (an auxiliary) could be some kind of weighted average over a year, to take into account seasonal variations and prevent oscillation. In the set of coupled formulae, Equations 4.74.12, we have shown how constants, auxiliaries, rates and levels are represented. You may wish to check the logic of this against
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