Ciencias Exactas y Ciencias de la Salud
Permanent URI for this collectionhttps://hdl.handle.net/11285/551039
Pertenecen a esta colección Tesis y Trabajos de grado de las Maestrías correspondientes a las Escuelas de Ingeniería y Ciencias así como a Medicina y Ciencias de la Salud.
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- A hierarchical multiobjective problem for green logistics(2017-12-04) Salazar Zendeja, Luis Alberto; González Velarde, José Luis; Camacho Vallejo, José Fernando; José Fernando Camacho Vallejo; González Velarde, José Luis; Cárdenas Barrón, Leopoldo EduardoThroughout all the extension of this thesis a situation where a distribution company and a manufacturer company work within a supply chain in a hierarchically manner. Each one of them has to optimize their own operations to minimize costs in the case of the manufacturer company and maximize profit as well as minimize CO2 emissions for the distribution company. A green logistic approach is also desired in this research, which is one of the reasons that a minimization of greenhouse gas emissions is considered. The resulting formulation of the problem is a multiobjective bilevel model, therefore a GRASP metaheuristic within a weighted sum method was developed to tackle this problem. In addition, a second simpler methodology which consists to reformulate the problem only as a selection of the customers that will be visited was used. In the latter methodology, the specific modeling known as the Multiple Choice Model was implemented to remove the bilevel aspect of the situation resulting in an easier model. Afterwards, this model was solved by a proposed Labeling Algorithm which will be compared with the traditional -constraint method for multiobjective problems. Twelve test instances were generated in order to assess both methodologies. The experimental results as well as the approximated Pareto front are shown. Finally, this thesis work presents the importance of using these kind of modeling techniques in a supply chain.
- Modelo de optimización binivel para la determinación de cuotas carreteras(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2010-12-01) Pinto Serrano, Gabriel; González Velarde, José Luis; Camacho Vallejo, José Fernando; tolmquevedo; Tecnológico de Monterrey, Campus MonterreyPara este trabajo se tomó el problema de determinar un conjunto óptimo en las cuotas para los arcos de una red de transporte multiproducto. El problema se formuló como un problema binivel, en donde el nivel superior consiste en una administración que establece las cuotas de la red, mientras que el nivel inferior está representado por un grupo de usuarios que viajan en los caminos más cortos con respecto a un costo de viaje generalizado. El objetivo no es tan sólo incrementar las cuotas, sino también mantener un flujo óptimo en los arcos de la red para maximizar los beneficios. Se propone una metodología para resolver este problema utilizando el optimizador Cplex y la metaheurística “Scatter Search”