Unformatted text preview: 5 (snpplcmentjfotc transportation model 211 must involve occupied and there are no others in the E column.
the Qt} cannot be used. Instead, we must borrow from the ill] and
add one unit to the It'llI in cell 3—43. We can complete our path back
to the original cell by subtracting a unit from the St} units in cell
B—A. The +.“— path is shown in Table 55—9. The impact on total
cost for the path associated with cell as would he: ("sell EDIA + _ {s—s} +12 (“e—e} —s (34:. E {34.3 _—_§ +2.3 —16 +is This means that for every unit shifted into cell s—s, the total cost
would increase by $12. Hence, we should avoid shipping units from Factory 2 to Warehouse A.
At this point, let’s pause for a moment and consider some helpful rules for obtaining evaluation paths, since you may still be a little
unsure of how to actually do it. 1. Start by placing a + sign in the cell you wish to evaluate. _‘ 2. Move horizontally {or vertically} to a completed cell. Choose a
cell which will permit your next move to another completed cell.
Assign a — sign to the cell. 3. Change direction and move to another completed cell. Again,
choose one which wi]l permit your next move. Assign a + sign to the cell.
4. Continue this process of moving to completed cells and alternating + and — signs until you can complete a closed path back to the
original cell. Make only horizontal and vertical moves. 5. You may ﬁnd it helpful to place a small dot or checltmarlt in
cells that have been evaluated to help lteep track of them. Let’s try another one, say, 3—H. Start by placing a + sign in cell
3—H. Move to the SH] in cell 2—13 and place a — sign there. Move to
the 110 in cell 243 and place a + sign there. Move to cell 3{3 and
give it a — sign. The path is shown in Table 55—13. This one was Jfairly easy. Let's see what the impact on cost is. Calla1i
+ —.
_ __ —
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He ‘ —is Ei‘r ...
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 Spring '09
 shakroh
 Math

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