Research Article
A Hybrid Approach to the Optimization of Multiechelon Systems
Table 3
Summary indices, parameters, and decision variables for transformed model.
| | Symbol | Description |
| | Indices |
| | Number of satellites | | Number of customers | | Number of possible routes from depot to satellites (CLP-determined) | | Number of possible routes from satellites to customers (CLP-determined) | | Satellite index | | Depot-satellite route index | | Customer index | | Satellite-customer route index | | Number of the 1st-level vehicles | | Number of the 2nd-level vehicles |
| | Input parameters |
| | Cost of loading/unloading operations of a unit of freight in satellite | | Demand required by customer | | Total demand for route (CLP-determined) | | Route cost (CLP-determined) | | Route cost (CLP-determined) | | If is located on route , otherwise | | If satellite or receipient s is located on route , otherwise | | Capacity of the vehicles for the 1st level |
| | Decision variables |
| | If the tour takes place along the route from the route set generated for level 1, then , otherwise | | If the tour takes place along the route from the route set generated for level 2, then , otherwise |
| | Computed quantities |
| | Total demand for route |
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