The vehicle routing problem
Computers and Operations Research - Anniversary focused issue of computers & operations research on tabu search
Dynamic window reduction for the multiple depot vehicle scheduling problem with time windows
Computers and Operations Research
Computers and Operations Research
A dual ascent procedure for the set partitioning problem
Discrete Optimization
Computers and Operations Research
Management of Bus Driver Duties Using Data Mining
International Journal of Applied Metaheuristic Computing
Dynamic Assignment of Crew Reserve in Airlines
International Journal of Applied Metaheuristic Computing
A model of resilient supply chain network design: A two-stage programming with fuzzy shortest path
Expert Systems with Applications: An International Journal
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The crew scheduling problem (CSP) appears in many mass transport systems (e.g., airline, bus, and railway industry) and consists of scheduling a number of crews to operate a set of transport tasks satisfying a variety of constraints. This problem is formulated as a set partitioning problem with side constraints (SP), where each column of the SP matrix corresponds to a feasible duty, which is a subset of tasks performed by a crew. We describe a procedure that, without using the SP matrix, computes a lower bound to the CSP by finding a heuristic solution to the dual of the linear relaxation of SP. Such dual solution is obtained by combining a number of different bounding procedures. The dual solution is used to reduce the number of variables in the SP in such a way that the resulting SP problem can be solved by a branch-and-bound algorithm. Computational results are given for problems derived from the literature and involving from 50 to 500 tasks.