Facultad Regional Santa Fe
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Item Economical assessment of the benefits of the supply chain management : a forestry industry example(Industrial & Engineering Chemistry Research, 2022-08-24) Vanzetti , Nicolás; Corsano, Gabriela; Montagna, Jorge MarceloNowadays, companies collaborate in a supply chain (SC), achieving superior results. Nevertheless, these benefits are not usually equally distributed among SC members. However, previous approaches generally address the profits of the entire system as a performance measure. In this way, a counterpoint arises between the optimality of the overall results and the benefits perceived by each of the participants. In this work, the differences between the global results and the individual benefits of each of the SC members are assessed to weigh the true impact of the integrated operation of the SC. A mixed integer linear programming model is presented to evaluate the SC performance for the forest industry, considering the strongly integrated and competitive operations among its members. Through examples, differences between integration and individual concerns are assessed, and an approach based on goal programming is proposed to effectively manage them. Conclusions can be easily extended to other contextsItem A mathematical modeling for simultaneous routing and scheduling of logging trucks in the forest supply chain(Forest Policy and Economics, 2022-01-12) Melchiori, Luciana; Nasini, Graciela; Montagna, Jorge Marcelo; Corsano, GabrielaTransportation cost in the forest industry highly impacts on the overall costs of the supply chain, and therefore it must be optimized for improving profitability. Considering the problem characteristics, the decisions related to the transport problem, such as allocation, routing, and scheduling, are usually decoupled, resorting to different decomposition strategies. As a result, suboptimal and underperforming solutions are obtained. In this article, decisions about raw material allocation, routing and scheduling are simultaneously solved through a mixed integer linear programming model. The proposed model involves an arc-based formulation for routing and a time grid discretization, including the definition of loading and unloading shifts for scheduling. This leads to detailed transportation planning for a homogeneous logging truck fleet that must fulfill the demand of varied raw material at minimum cost. Examples and performance tests are provided to assess the capabilities of the proposed exact approach.Item Resources synchronization in a full truckload pickup and delivery problem : an exact approach(Computers and Operations Research, 2022-12-05) Melchiori , Luciana; Nasini, Graciela; Montagna, Jorge Marcelo; Corsano, GabrielaIn this work, the Unpaired Full Truckload Pickup and Delivery Problem with Resource Synchronization is modeled and solved, where routes must be determined to transport commodities from pickup to delivery locations by a set of vehicles, subject to timing and resource synchronization constraints, to satisfy demands at minimum cost. Unlike previous works, the use of multiple resources for loading and unloading tasks at each location are considered and appropriately managed through a representation using discrete shifts. An integer linear programming model is proposed to simultaneously solve allocation, routing and resources synchronization optimization problems. In order to improve the model performance for large size instances, diverse reformulations, including additional inequalities and symmetric-breaking constraints, are implemented and tested. Moreover, a heuristic procedure is proposed to provide good initial feasible solutions. The capabilities of the proposed approach are assessed through several examplesItem Detailed planning and inventory optimization model in the mattress industry(2015) Montagna, Jorge Marcelo; Cecchietti, Aldo; Rodriguez, María Analía; Corsano, GabrielaIn this work, a mixed integer linear programming (MILP) model for the simultaneous production and inventory planning problems is proposed, which arise in the industrial context of polyurethane foam manufactory. The production process considers the foam blooming stage as well as the curing step where the blocks are dried. Several tradeoffs are involved in the overall model given that detailed inventory management decisions are also taken into account in the formulation. Several study cases provided by a local company are tested to show the model performance.Item Optimal planning and scheduling of multiproduct batch plants operating under production campaign in a multiperiod context(2013) Fumero, Yanina; Corsano, Gabriela; Moreno, Marta S.; Montagna, Jorge MarceloA multiperiod optimization model for the simultaneous planning and scheduling of multiproduct batch plants is presented in this work. Decisions about production and storage of different products, as well as production campaign in each period are jointly taken into account. Thus, for each time period, the number and size of batches of each product in the campaign, the assignment of batches to units and their sequencing, and the number of repetitions of the campaign must be determined. Different trade-offs among the various decision variables are evaluated according to seasonal and market fluctuations presented in each period. The proposed modelling framework provides a valuable tool for guiding the decisions in planning and scheduling of multiproduct batch plants.Item Sustainability in the forest supply chain considering the efficient use of residues and byproducts(2015) Corsano, Gabriela; Campanella, Sandra; Montagna, Jorge MarceloSupply chain (SC) globally integrates production units with raw material sources and customers, and coordinates all input and output flows (materials, information, finance, etc.) so that the products are produced and distributed in the right amounts, in appropriate locations and at the right time. These activities involve complex tasks that have different tradeoffs between the involved actors and require significant effort to coordinate the common actions. In particular, the forest SC has many heterogeneous participants, therefore, its integration is a challenging issue. One of the main aspects in the forest industry is the huge amount of generated residues and by-products generating through the wood mechanical transformation, from the harvest to the final product production. The residues use has not receive much attention, and its appropriate and efficient use is affected by many factors, as big involved volume, which increases the transportation cost. Nowadays, residues are burned in order to avoid its accumulation. This generates smoke, ash and gases impacting the environment, increasing the greenhouse effect and modifying the landscape. With the aim of avoiding these drawbacks, in this work a mixed integer linear programming (MILP) model for the optimal design and planning of the forest SC is proposed. The formulation considers different production alternatives, with the objective of maximizing the net benefit, generating the sustainable design of the overall network. This work is developed considering the particular characteristics of the Argentinean forest industry, but it can be easily adapted for other geographical regions. The proposed approach represents a useful tool for decision making and analysis of different production-distribution scenarios of sustainable SCs.Item Impacto del uso de residuos en el diseño y operación de una cadena de suministros para la producción de etanol(2015) Montagna, Jorge Marcelo; Fumero, Yanina; Vanzetti, Nicolás; Corsano, GabrielaEn este trabajo se desarrolla un modelo multiobjetivo (maximizar ganancias-minimizar impacto ambiental) para el diseño óptimo de una cadena de suministro para la producción de etanol a partir de mieles provenientes de diversas plantas de azúcar. Simultáneamente se obtiene el diseño de cada planta instalada y la programación detallada de su producción, esto último modelado mediante campañas mixtas de producción. El impacto ambiental causado por la producción de etanol es medido a través de los efluentes generados en cada planta. Para minimizar este impacto, se propone producir levaduras de dos tipos. De esta forma, el problema multiobjetivo es resuelto maximizando la función económica para diferentes valores permitidos de efluentes, generando un conjunto de soluciones posibles. A través de un caso de estudio, se muestra la potencialidad del enfoque propuesto, que sirve como herramienta al momento de diseñar una cadena sustentable y permite analizar diferentes escenarios.Item Optimal design of forest supply chain considering efficient residues and byproducts reuse(2015) Montagna, Jorge Marcelo; Corsano, Gabriela; Campanella, SandraForest supply chain includes different actors which work together to obtain many products through a set of processes that must be efficiently integrated. Nevertheless, the great number of involved elements and the available production alternatives hinder to attain an optimal supply chain design. A key element to achieve this objective is the adequate utilization of residues and byproducts that abound in these industries. Nowadays, the production of bioethanol from forest raw materials is also a new option that must be addressed in the context of the supply chain. Taking into account the particular conditions of the forest industry in Argentina, a mixed integer linear programming formulation is proposed in order to attain the optimal design of the forest supply chain, emphasizing the appropriate use of residues and byproducts and the production of bioethanol from these raw materials.Item Simultaneous planning and scheduling of multistage multiproduct batch plants with non-identical parallel units and sequence-dependent changeovers(2014) Montagna, Jorge Marcelo; Fumero, Yanina; Corsano, GabrielaA mixed integer linear programming model for the simultaneous planning and scheduling of multistage multiproduct batch plants in a multiperiod context is presented in this work. The batch plant is composed by a set of stages with parallel units of different sizes. The scheduling decisions are modeled considering mixed product campaign-based operation mode and sequence-dependent changeover times. Thus, for each time period, the number of batches of each product in the campaign, the batch assignment to units in each stage and its sequencing, and the number of repetitions of the campaign are jointly determined. Also, decisions about production and storage of different products, and raw material consumption and storage are taken into account. The approach capabilities are highlighted through an example.Item An MILP model for planning of batch plants operating in a campaign- mode(2014) Fumero, Yanina; Corsano, Gabriela; Montagna, Jorge MarceloA mixed integer linear programming for the detailed production planning of multiproduct batch plants is proposed in this work. New timing decisions are incorporated to the model taking into account that an operation mode based in campaigns is adopted. For plants operating in a regular fashion along a time horizon, this operation mode assures a more efficient production management. In addition, sequencedependent changeover times and different unit sizes for parallel units in each stage are considered. Given the plant configuration and unit sizes, the total amount of each product to be produced and the product recipes, the proposed model determines the number of batches that compose the production campaign and their sizes, the assignment and sequencing of batches in each unit, and the timing of batches in each unit in order to minimize the campaign cycle time. The proposed model provides a useful tool for solving the optimal campaign planning of installed facilities.