Facultad Regional Santa Fe
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Item 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.Item Diseño óptimo de cadenas de suministros considerando criterios ambientales(2014) Montagna, Jorge Marcelo; Corsano, Gabriela; Campanella, SandraEn el presente trabajo se propone un modelo multiobjetivo de pro-gramación mixta entera lineal para el diseño sustentable de la Cadena de Sumi-nistros (CS). Se desea determinar el diseño óptimo de la CS teniendo en cuenta las variables económicas y ambientales mediante la metodología "epsilon cons-traint". Para la formulación se considera una CS de 4 niveles: materia prima, plantas de producción, centros de distribución y consumidores. Para introducir la variable ambiental dentro del diseño se propone el uso de una metodología de Evaluación de Impacto Ambiental (EIA) del tipo "checklist" o "lista de che-queo", como una primera aproximación al estudio del impacto ambiental. Se plantea el análisis ambiental de manera desagregada a lo largo de la CS. El modelo propuesto se aplica al diseño de una CS de producción de etanol a partir de caña de azúcar y miel obtenida a partir de ésta.Item Supply chain planning considering the production of defective products(2014) Corsano, Gabriela; Montagna, Jorge Marcelo; Ferrara, Miguel AngelWhen the markets become more competitive, the customer satisfac-tion level starts to be a more important factor. One of the principal components to achieve the customer satisfaction is to minimize the amount of defective or non-standard products. Therefore, it is convenient to consider decisions about product quality when the supply chain is planned. In this work, a mixed integer linear programming mathematical (MILP) model is developed for the supply chain planning, which determines impact of different decisions over the ex-pected number of defective products. These decisions are: supplier selection, inbound control methods selection, and production process selection. The ob-jective function is the cost minimization associated to the supply chain plan-ning.