Inventory Control

1
Inventory Control

• Basic EOQ
• By Kawinthorn Saicharoen

2
Objective of Inventory Control
Objective
MIN Cost
MAX Profit
3
Objective of Inventory Control
MAX Profit
Income - Cost
MIN Cost
SUM of Cost
ITEM COST
Holding Cost
COST
Shortage Cost
Setup Cost
4
Inventory Assumption

1. ???????????????????????
2. ??????????????????????????????????
3. ????????????????????????????????????????????
4. ??????????????
5. ???????????????????????????
6. ???????????????????????????????????????

5
Inventory Assumption
????? TC ????????? D ??????????????????? 1
?? C ?????????? Q ????????????????? I
???????? S ????????????????????
6
Calculation EOQ
?????? Q ???????? ??????????????????
7
??????????? 1
??????? EOQ ???????????????????????????????? 1000
???? ?????????? 12.5 ??? ????????????????????????
????????????????????????????????? 5 ??? /?????
????????????????????????????? 10 ?????????????
Solve D 1000 C 12.5 I 0.1 S 5
8
??????????? 2
?????????????? 1 ?????????????????????????????
200 ???????????????????? ?????????? 8 ???
???????????????
Ans. ???????????????? 200 ????
9
??????????? 3
??????????????????????????????? 10000 ????
?????????????????????????? 20???/????????????????
??????????????? 20 ??????????????????? ??????????
? 1-499 ???? ??????? 5 ??? 500-999 ????
??????? 4.5 ??? gt 1000 ???? ??????? 4 ???
Solve 1. ????? EOQ ??????? ???? 2. ????? EOQ
??????????????? ??????????????????????????????????
?? 3. ?????????????????? 1 ?????????????????????
??? TC
10
??????????? 3(???)
TC(500) 45625 ??? TC(667) 45330 ??? TC(1000)
45480 ???
11
??????? 1

• ???????? Inventory Policy ????????????????
• ????????????????????(?????????????)
• ?????????????????? Solver

????? ???????? D 23918 C 980 I
4.5 S 150
12
??????? (???)

1. ???? EOQ
2. ??? ???? 1000 ?????????? ????????????? 950 ???
   ??????????????
3. ??????????????????????????????????????? 40
   ??????????????????????? ?????????????????? ??? 950

13
QUIZE

• ?? paper ???????????????????????????
• ?????????????????????????????????
• ???????????????????????????? Bullwhip Effect
  ?????? Two stage Supply Chain ??????????
• ??????????????????????????
• Centralizing Customer demand information
  ??????????????????????????