【正文】 g Days / Year = = = = = = = = Q* D S H N D Q* T N d D ROP d L 2 D = Demand per year S = Setup (order) cost per order H = Holding (carrying) cost d = Demand per day L = Lead time in days EOQ Model Equations Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1232 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 168。 Develop an expression for holding cost 168。 Cost is spread over more units Example: You need 1000 microwave ovens Purchase Order Description Qty. Microwave 1 Purchase Order Description Qty. Microwave 1 Purchase Order Description Qty. Microwave 1 Purchase Order Description Qty. Microwave 1 1 Order (Postage $ ) 1000 Orders (Postage $320) Order quantity Purchase Order Description Qty. Microwave 1000 Why Order Costs Decrease Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1229 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 EOQ Model When To Order Reorder Point (ROP) Time Inventory Level Average Inventory (Q*/2) Lead Time Optimal Order Quantity (Q*) Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1230 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 Deriving an EOQ 168。 No stockouts EOQ Assumptions Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1226 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 Order Quantity Annual Cost Order (Setup) Cost Curve Optimal Order Quantity (Q*) EOQ Model How Much to Order? Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1227 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 168。 No quantity discounts 168。 Known and constant lead time 168。 Fixed order period models Help answer the inventory planning questions! ?19841994 T/Maker Co. Inventory Models Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1225 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 168。 Quantity discount 168。 Economic order quantity 168。 Etc. Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1224 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 168。 Retooling costs 168。 Etc. Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1223 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 Setup Costs 168。 Order processing 168。 Supplies 168。 Warehousing 168。 Pilferage 168。 Extra staffing 168。 Obsolescence 168。 Ordering costs associated with costs of placing order and receiving goods 168。 Dependent demand demand for item is dependent upon the demand for some other item Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1219 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 Holding, Ordering, and Setup Costs 168。 Effective control of all goods leaving the facility Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1218 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 07458 Independent versus Dependent Demand 168。 Good personnel selection, training, and discipline 168。 Allows the cause of errors to be identified and remedial action to be taken 168。 Eliminates annual inventory adjustments 168。 A items counted most often (., daily) Cycle Counting Transparency Masters to acpany Operations Management, 5E (Heizer Render) 1216 ?1998 by Prentice Hall, Inc. A Simon Schuster Company Upper Saddle River, . 0745