Download - Policies for an Integrated SC
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Policies for an Integrated SCPolicies for an Integrated SC
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A SCA SC
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PrinciplesPrinciples
Inventory depends on demand Inventory depends on demand during Lead Timeduring Lead Time
Lead Time = L + Backlog Previous Lead Time = L + Backlog Previous StationStation
Or Max(L + backlog) over all Or Max(L + backlog) over all previous stationsprevious stations
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L = Processing Time +
Transportation +Lot Time +…
(7/11)
Demand overthe delivery lag
Backlog
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Base Policy: Keep Inv. Position = sBase Policy: Keep Inv. Position = s
DLag = D*(L+Tb)
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SummarySummary
Pr ,1) ( )
2) 0
3)
Lag j edecesors j b j
Lag Lag
Lag
b
D D Max L T
if s D then IN s D remaining inventory
else B D s
BFinally T
D
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In generalIn general
)(
1
iSucjjQiQ
n
i iQih
iQiG
Min
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Nested Stationary Power of 2Nested Stationary Power of 2
5 10 15 20 25 30123456789101112
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Very FlatVery Flat
Optimal power of 2 policy less Optimal power of 2 policy less than 16% worse than Optimalthan 16% worse than Optimal
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BOMT = (1,1,1,2,2,2,2,8,16,16,16,16)
BOMT = (1,1,1,2,2,2,2,8,16,16,16,16)
1,2,3
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UpstreamUpstream
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UpstreamUpstream
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In generalIn general
2
1
Nested Power of
Gn iMin h Qi iQi i
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Lot sizesLot sizes
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USE the SOLVERUSE the SOLVER