1. Economic Order Strategy in Dining Service Distribution Center Qian Zhang Qiuyue Zhao

2. Problem Definition S2 S1 S3 S4 S5 S6 Dining Hall -1 Dining Hall-2 Dining Hall-3

3. Problem Definition Transportation Cost Holding Cost Perish Cost Location of Suppliers Inventory Level Product life Product Price

4. Objective Minimize total cost How much to order from which supplier Tracing the inventory of product from certain supplier at time t Check how much product DC dump at time t

5. Assumption DC only order once in a certain time period All the products delivered from DC until all the orders arrived Frequency of product delivered from DC to dining halls in a certain period is known The shortage for DC is not allowed The holding cost for each kind of product is same One supplier can provide multiple types of products Model

6. Parameter P sk Price of the k th type of product by the s th Supplier H Holding cost per product R s Transportation cost per truck of the s th Supplier a skt =1, if product k shipped by supplier s expires at time t 0, otherwise B s Truck transportation capacity of supplier s D kt Demand for product k at time t F sk Supply capability of supplier s for product k Model

7. Variables Q sk quantity of product k ordered from supplier s X skt inventory of product k from supplier s at time t Y skt how much we use product k from supplier s to satisfy demand in time t Z skt amount we dump of product k from supplier s at time t I s times of delivered trucks Model

8. Objective Function Model

9. Constrains Satisfy demand Inventory balance Minimize perish Supply capability Initial inventory Model

10. Data Collection H=$0.08 P B 10 P1P2P3 S11.32.63.4 S21.82.33.2 S1S2S3S4 B150170200210

11. At time t1 11 P1P2P3P4P5P6P7P8P9P10 S1000100022600001690 S23000100180018002720020520 S300014522100540479800 Data Collection

12. Result S2S1S3S4S5S6 P1P2P3P4P5 P6P7 P8 P9 P10 100 22601690 3000100180018 272 0 2052 1452210 540 4798 2000 51001141150 500 30148 1230 400 500 2000 570 Products Suppliers

13. Thank you!