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Stochastic optimization models for a home service routing and appointment scheduling problem with random travel and service times

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  • Tsang, Man Yiu
  • Shehadeh, Karmel S.

Abstract

We address a routing and appointment scheduling problem with uncertain service and travel times arising from home service practice. Specifically, given a set of customers within a service region that an operator needs to serve, we seek to find the operator’s route and time schedule. The quality of routing and scheduling decisions is a function of the total operational cost, consisting of customers’ waiting time, and the operator’s travel time, idle time and overtime. We propose and rigorously analyze a stochastic programming model and two distributionally robust optimization (DRO) models to solve the problem, assuming known and unknown service and travel time distributions, respectively. We consider two popular types of ambiguity sets for the DRO models: mean-support and 1-Wasserstein ambiguity sets. We derive equivalent mixed-integer linear programming (MILP) reformulations of both DRO models that can be implemented and efficiently solved using off-the-shelf optimization software, thereby enabling practitioners to use these models. In an extensive numerical experiment, we investigate the proposed models’ computational and operational performance and derive insights into the problem.

Suggested Citation

  • Tsang, Man Yiu & Shehadeh, Karmel S., 2023. "Stochastic optimization models for a home service routing and appointment scheduling problem with random travel and service times," European Journal of Operational Research, Elsevier, vol. 307(1), pages 48-63.
    • Handle: RePEc:eee:ejores:v:307:y:2023:i:1:p:48-63
    DOI: 10.1016/j.ejor.2022.09.020
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