
In industrial resource allocation problems, an initial planning stage may solve a nominal problem instance and a subsequent recovery stage may intervene to repair inefficiencies and infeasibilities due to uncertainty, e.g.\ machine failures and job processing time variations. In this context, we investigate the minimum makespan scheduling problem, a.k.a.\ $P||C_{\max}$, under uncertainty. We propose a two-stage robust scheduling approach where first-stage decisions are computed with exact lexicographic scheduling and second-stage decisions are derived using approximate rescheduling. We explore recovery strategies accounting for planning decisions and constrained by limited permitted deviations from the original schedule. Our approach is substantiated analytically, with a price of robustness characterization parameterized by the degree of uncertainty, and numerically. This analysis is based on optimal substructure imposed by lexicographic optimality. Thus, lexicographic optimization enables more efficient rescheduling. Further, we revisit state-of-the-art exact lexicographic optimization methods and propose a lexicographic branch-and-bound algorithm whose performance is validated computationally.
Exact MILP methods, FOS: Computer and information sciences, Lexicographic optimization, Combinatorial optimization, 330, Deterministic scheduling theory in operations research, robust optimization, 650, Price of robustness, lexicographic optimization, Computer Science - Data Structures and Algorithms, FOS: Mathematics, Data Structures and Algorithms (cs.DS), scheduling, Mathematics - Optimization and Control, math.OC, Scheduling, exact MILP methods, Robustness in mathematical programming, Resource and cost allocation (including fair division, apportionment, etc.), cs.DS, Optimization and Control (math.OC), Polyhedral combinatorics, branch-and-bound, branch-and-cut, Robust optimization, price of robustness
Exact MILP methods, FOS: Computer and information sciences, Lexicographic optimization, Combinatorial optimization, 330, Deterministic scheduling theory in operations research, robust optimization, 650, Price of robustness, lexicographic optimization, Computer Science - Data Structures and Algorithms, FOS: Mathematics, Data Structures and Algorithms (cs.DS), scheduling, Mathematics - Optimization and Control, math.OC, Scheduling, exact MILP methods, Robustness in mathematical programming, Resource and cost allocation (including fair division, apportionment, etc.), cs.DS, Optimization and Control (math.OC), Polyhedral combinatorics, branch-and-bound, branch-and-cut, Robust optimization, price of robustness
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