Research Article
A Branch-and-Price Algorithm for an Integrated Online and Offline Retailing Distribution System with Product Return
Table 1
The symbols and notations.
| | Explanations |
| Sets | | | Set of all nodes (central warehouse, retail stores, and customers) | | Set of retail stores | | Set of customers ordering products online | | Set of customers with product returns | | Set of available vehicles | Parameters | | | Vehicle capacity | | Demand of node | | Number of returned products from customer | | Inventory level at retail store | | Delivery cost with traversing arc | | Delivery time with traversing arc | | Service time at the node | Decision variables | | | The number of products needed to be picked up at retail store by vehicle | | The product quantity carried by vehicle after leaving node | | The arrive time at node by vehicle | | 1 if the arc is traversed by vehicle , and 0 otherwise | | 1 if customer is served by store and 0 otherwise |
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