Production, Capacity And Material Planning Page 58

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Material Requirements Planning
=
D
demand
per
period
for
product
j
j
=
t
unit
-
production
time
for
product
j
j
=
S
set
-
up
time
for
product
j
j
=
Q
lotsize
for
product
j
j
mean
arrival
rate
of
batches
:
D
n
n
λ
λ
j
=
=
j
Q
=
=
j
j
j
1
1
mean
service
time
:
service
-
time
variance
:
n
n
λ
λ
+
+
S
t
Q
S
t
Q
2
(
)
(
)
j
j
j
j
j
j
j
2
j
1
1
=
=
σ
=
j
=
j
⎜ ⎜
⎟ ⎟
1
1
2
μ
μ
n
n
λ
λ
j
j
=
=
j
j
1
1
Production Management
157

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