Abstract
We address the economic lot sizing problem with product returns and remanufacturing. For this problem we provide a new theoretical result about the form of the optimal solutions that can be considered a generalization of the well-known zero-inventory property. Based on this result we suggest an optimized version of an existing Tabu Search procedure. The original and the optimized version of the procedure are evaluated on a recent benchmark set of large instances of 52 periods. The numerical experiment carried out shows that both variants of the procedure outperform the solving procedure suggested in the literature in over 90 % of the tested cases and in about tenth of computation time in the worst case.
Highlights
Hair is often associated with an individual’s identity [17] with many choosing to supplement what they have or replace what they have lost
Recycling, reconditioning and remanufacture of waste materials are identified as mechanisms to reduce waste of false hair products within the UK industry, with potential for this research to impact on an international scale by reducing the global demand for natural raw materials and limiting the environmental impact of synthetic fibres
In other parts of the UK, there are no nationally set limits on the number of wigs a patient can receive from the National Health Service in the UK (NHS), there is nothing in place to prevent local NHS organisations from setting their own limit [22]
Summary
Hair is often associated with an individual’s identity [17] with many choosing to supplement what they have or replace what they have lost. False hair products (FHPs) are defined within this paper as any product that adds to, or replaces, a person’s existing hair. This includes a Journal of Remanufacturing (2019) 9:235–256 range of products such as full and partial wigs, weaves, toupees, toppers, extensions, eyelashes and eyebrows, all of which will be collectively referred to within this paper as FHPs. FHPs can be made from human hair or synthetic materials [17], which have differing market values based on their availability, quality and lifespan. Synthetic materials for FHPs are more readily available, but lack the quality of their human hair counterparts. The increasing global production of polymers (used to make synthetic FHPs) results in large amounts of waste material and associated environmental problems [4]
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