Transportation and Network Models(英文版)(ppt 58页)
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Transportation and Network Models(英文版)内容提要：
Introduction：
TRANSPORTATION MODEL
Determine how to send products from various sources to various destinations in order to satisfy requirements at the lowest possible cost.
ASSIGNMENT MODEL
Allocating fixed-sized resources to determine the optimal assignment of salespeople to districts, jobs to machines, tasks to computers …
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Transportation Model
An example, the AutoPower Company makes a variety of battery and motorized uninterruptible electric power supplies (UPS’s).
AutoPower has 4 final assembly plants in Europe and the diesel motors used by the UPS’s are produced in the US, shipped to 3 harbors and then sent to the assembly plants.
Production plans for the third quarter (July – Sept.) have been set. The requirements (demand at the destination) and the available number of motors at harbors (supply at origins) are shown on the next slide:
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When Supply and Demand Differ
When supply and demand are not equal, then the problem is unbalanced. There are two situations:
When supply is greater than demand:
In this case, when all demand is satisfied, the remaining supply that was not allocated at each origin would appear as slack in the supply constraint for that origin.
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