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Storage Assignment and Order Picker Routing Problem

Saeedi Varnamkhasti, Mohammad Hosein | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58652 (01)
  4. University: Sharif University of Technology
  5. Department: Industrial Engineering
  6. Advisor(s): Akbari Jokar, Mohammad Reza
  7. Abstract:
  8. The rapid growth of e-commerce and the increasing demand from customers for fast and accurate order deliveries have significantly heightened the importance of warehouse operation optimization. Among various warehouse activities, product layout and order-picking processes play a crucial role in reducing response time and enhancing productivity. This research proposes a four-stage approach to improve the performance of e-commerce warehouses. In the first stage, efficient products for warehouse storage were identified using the Data Envelopment Analysis (DEA) method. In the second stage, products were categorized based on common order patterns, and in the third stage, they were allocated to shelves considering three product types: large-size items, regular items, and high-value items. The fourth stage focused on designing an optimal order-picking route to minimize travel time and operational costs. To validate the proposed model, a case study was conducted in an e-commerce company in Iran. In this study, the third and fourth stages were implemented and compared under two warehouse layout types — the current rectangular layout and the proposed fishbone layout. The results demonstrated that using the fishbone layout, in conjunction with the proposed strategies, enhanced warehouse efficiency, reducing order-picking time and travel distance by up to 27%, while improving customer service levels. This research not only presents a practical framework but also provides valuable insights for warehouse managers and paves the way for developing innovative strategies to optimize logistics operations in e-commerce
  9. Keywords:
  10. Warehouse Management ; Data Envelopment ; Electronic Commerce ; Fishbone Layout ; Optimal Routing

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