PDF A Simple Inventory System - Computer Science
A Simple Inventory System
A Simple Inventory System
Section 1.3 Discrete-Event Simulation: A First Course
Section 1.3: A Simple Inventory System
Discrete-Event Simulation c 2006 Pearson Ed., Inc. 0-13-142917-5
A Simple Inventory System
Section 1.3: A Simple Inventory System
customers
demand
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................................................................................................................
items
facility
order
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..............................................................................................................
items
supplier
Distributes items from current inventory to customers Customer demand is discrete Simple one type of item
Section 1.3: A Simple Inventory System
Discrete-Event Simulation c 2006 Pearson Ed., Inc. 0-13-142917-5
A Simple Inventory System
Inventory Policy
Transaction Reporting Inventory review after each transaction Significant labor may be required Less likely to experience shortage
Periodic Inventory Review Inventory review is periodic Items are ordered, if necessary, only at review times (s, S) are the min,max inventory levels, 0 s < S
We assume periodic inventory review Search for (s, S) that minimize cost
Section 1.3: A Simple Inventory System
Discrete-Event Simulation c 2006 Pearson Ed., Inc. 0-13-142917-5
A Simple Inventory System
Conceptual Model
Inventory System Costs
? Holding cost: ? Shortage cost: ? Setup cost: ? Item cost: ? Ordering cost:
for items in inventory for unmet demand fixed cost when order is placed per-item order cost sum of setup and item costs
Additional Assumptions
Back ordering is possible No delivery lag Initial inventory level is S Terminal inventory level is S
Section 1.3: A Simple Inventory System
Discrete-Event Simulation c 2006 Pearson Ed., Inc. 0-13-142917-5
A Simple Inventory System
Specification Model
Time begins at t = 0 Review times are t = 0, 1, 2, . . . li-1 : inventory level at beginning of i th interval oi-1 : amount ordered at time t = i - 1, (oi-1 0) di : demand quantity during ith interval, (di 0) Inventory at end of interval can be negative
Section 1.3: A Simple Inventory System
Discrete-Event Simulation c 2006 Pearson Ed., Inc. 0-13-142917-5
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