FRCU - GIECRRER: Grupo de Investigación en Economía Computacional de Regulación de Redes y Energías Renovables

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    A two-stage procedure for efficiently solving the integrated problem of production, inventory, and distribution of industrial products
    (2019-12-24) Cóccola, Mariana Evangelina; Méndez, Carlos Alberto; Dondo, Rodolfo Gabriel
    This paper deals with the problem of optimally planning the production, inventory and distribution of products transported via multi-compartment vehicles. It assumes that facilities in the distribution net- work have preservation-storing devices to inventory products on-site. Production activities may be per- formed on any time period of the planning horizon. Due to problem complexity, a two-stage solution strategy that first generates a set of multi-period distribution routes through a column generation ap- proach is proposed. The routes are used for feeding the MILP formulation of the problem. Several valid inequalities are proposed for expediting the MILP resolution. The aim is to maximize the profit obtained by the company that fabricates and distributes the products. This profit is computed as the total income from sales minus the sum of all costs incurred along the planning horizon. The effectiveness of the two- stage solution strategy is tested on an extensive set of realistic instances.
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    Scheduling of flexible manufacturing plants with redesign options : a MILP-based decomposition algorithm and case studies
    (2020-05-08) Basán, Natalia P.; Cóccola, Mariana Evangelina; García del Valle, Alejandro; Méndez, Carlos Alberto
    In the last years, the operational research on scheduling problems has been moving away from rigorous optimization approaches into solution strategies being capable of returning practical and fast solutions for large-scale industrial problems. Following this line, this paper proposes a novel MILP-based decompo sition procedure for solving scheduling problems arising in flexible manufacturing environments, which generally involve multipurpose units and assembly operations. The solution strategy also considers re design constraints with the goal of improving the efficiency of the production system, preventing bottle necks and balancing the equipment utilization. The proposal is validated through the resolution of several instances derived from three real-world case-studies coming from different industrial sectors. The com putational results show that the decomposition procedure is capable of generating high quality solutions, sometimes the optimal one, with minimum computational effort for all problem instances considered.