Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The fragility-constrained vehicle routing problem with time windows   We study a new variant of the well-studied Vehicle Routing Problem with Time
Windows (VRPTW), called the fragility-constrained VRPTW, which assumes that 1)
the capacity of a vehicle is organized in multiple identical stacks; 2) all
items picked up at a customer are either "fragile" or not; 3) no non-fragile
items can be put on top of a fragile item (the fragility constraint) ; and 4)
no en-route load rearrangement is possible. We first characterize the
feasibility of a route with respect to this fragility constraint. Then, to
solve this new problem, we develop an exact branch-price-and-cut (BPC)
algorithm that includes a labeling algorithm exploiting this feasibility
characterization to efficiently generate feasible routes. This algorithm is
benchmarked against another BPC algorithm that deals with the fragility
constraint in the column generation master problem through infeasible path
cuts. Our computational results show that the former BPC algorithm clearly
outperforms the latter in terms of computational time and that the fragility
constraint has a greater impact on the optimal solution cost (compared to that
of the VRPTW) when vehicle capacity decreases, stack height increases and for a
more balance mix of customers with fragile and non-fragile items.

11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg