12 research outputs found
Evaluation of a new supply strategy based on stochastic programming for a fashion discounter
Fashion discounters face the problem of ordering the right amount of pieces
in each size of a product. The product is ordered in pre-packs containing a
certain size-mix of a product. For this so-called lot-type design problem, a
stochastic mixed integer linear programm was developed, in which price cuts
serve as recourse action for oversupply. Our goal is to answer the question,
whether the resulting supply strategy leads to a supply that is significantly
more consistent with the demand for sizes compared to the original manual
planning. Since the total profit is influenced by too many factors unrelated to
sizes (like the popularity of the product, the weather or a changing economic
situation), we suggest a comparison method which excludes many outer effects by
construction. We apply the method to a real-world field study: The improvements
in the size distributions of the supply are significant.Comment: 5 pages, 1 tabl
An exact column-generation approach for the lot-type design problem
We consider a fashion discounter distributing its many branches with integral
multiples from a set of available lot-types. For the problem of approximating
the branch and size dependent demand using those lots we propose a tailored
exact column generation approach assisted by fast algorithms for intrinsic
subproblems, which turns out to be very efficient on our real-world instances
as well as on random instances.Comment: 36 pages, 8 figures, 1 tabl