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Determination of Loading and Unloading Program in a Cross-Docking System

Mohammadi Ghomi, Sahar | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43994 (01)
  4. University: Sharif University of Technology
  5. Department: Industrial Engineering
  6. Advisor(s): Akbari Jokar, Mohammad Reza
  7. Abstract:
  8. Using the cross docking is a strategy that plays inventory coordinating role in the supply chain. At the cross docking, products of inbound trucks are unloaded, sorted, moved and loaded onto outbound trucks for delivery to different destinations. In this concept, coordination between inbound and outbound trucks considering a cross-dock system with multiple receiving and shipping dock doors. Moreover, due to justifiability of all trucks to carry multiple product types, product assignment from inbound trucks to outbound trucks is determined simultaneous to scheduling. As an exact solution approach a MIP model is presented and since the problem is shown to be NP-hard, it can only be used to solve small scale problems. To deal with large scale problems, two meta-heuristics TS and GA algorithms are developed.
    The Taguchi method is used to reveal the best robustness of the algorithms. Using two different types of sequencing of inbound trucks to unloading doors and outbound trucks to loading is presented. Thus, four scenarios have been developed. Finally, performances of all the scenarios are compared with results of exact solution. Results show that from aspect of applicability, the scenarios which are related to TS perform better that GA ones and that the TS algorithm with random sequencing of Inbound and outbound trucks performs the best. Thus, it is quiet sensible to employ this algorithm as a suitable approximate approach
  9. Keywords:
  10. Scheduling ; Supply Chain ; Cross Docking ; Logistics ; Tabu Search Metaheuristic Algorithm

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