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Ambulances, when idle, are located at designated waiting sites.
Testcase 1 considered the 16 potential waiting sites currently in use.
See Fig. 4 for a graphical representation of the road network and the location of waiting sites.
Only feasible movements – in terms of the capacity restrictions prevailing at the potential waiting sites – are considered.
For the larger instances however (with 94 and 163 potential waiting sites) CPLEX fails to find meaningful solutions.
For testcases 2, 3 and 4 the number of potential waiting sites was changed to 51, 94 and 163 respectively.
Similar(50)
Then Heidi found out on a "Children in Waiting" site that Haiti was open to international adoption.
By law ambulances are not allowed to be repositioned from one waiting site to another one.
At any point in time ambulances are in one of the following three statii: (i) idle (waiting) at a waiting site, (ii) currently busy with a serving or driving to a request or (iii) currently redeployed to a waiting site.
Please note that in Austria by law ambulances are not allowed to be repositioned empty from one waiting site to another one.
Alternatively – in case no assignment could be found – the latter group of ambulances, it has to be relocated (empty) to a waiting site.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com