Person: Serrano Hernández, Adrián
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Serrano Hernández
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Adrián
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Estadística, Informática y Matemáticas
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ISC. Institute of Smart Cities
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0000-0003-3623-4100
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810953
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Publication Open Access Decision making with horizontal cooperation and environmental criteria for transportation: optimization and simulation models for the vehicle routing problem and the facility location problem(2018) Serrano Hernández, Adrián; Faulín Fajardo, Javier; Estadística, Informática y Matemáticas; Estatistika, Informatika eta MatematikaTransportation is a major contributor to the development of the world economy and, at the same time, a major contributor to air pollution and global warming. Additionally, the unstoppable increase of competition as consequence of the globalization, as well as the increasingly service quality demanded by customers related to shorter times and lower costs, are forcing logistics companies to consider new managerial strategies. In this sense, horizontal cooperation among logistic companies is seen as a real alternative for gaining efficiency and sustainability. These agreements can be summarized as any arrangement between partners, tacit or not, which involves more than one company without vertical relationship between them, i.e., no supplier-customer relationship, based on trust and mutual commitment to identify and exploit win-win situations with the goal of sharing benefits (or risks) that would be higher (or lower) than each company would obtain if they acted completely independently. Therefore, in the first part of this thesis, several simulation models have been developed to track the evolution of a coalition in order to quantify horizontal cooperation impact in both economic and environmental sides considering the existence of trust-related issues. Additionally, as a great source of cooperation, a real application consisted on the location of a biorefinery is presented, developed, and discussed. On the other hand, environmental impacts of transportation should be measured and assessed for their integration in the existing optimization models. Thus, the second part of this thesis is devoted to the pricing through a contingent valuation survey of environmental impacts (externalities) and their internalization in the well-known Vehicle Routing Problem. In this sense, several optimization models are developed to assess the impact of the internalization of externalities on the routing decisions of logistics operations.Publication Open Access Multi-criteria simulation-optimization analysis of usage of automated parcel lockers: a practical approach(MDPI, 2022) Sawik, Bartosz; Serrano Hernández, Adrián; Muro, Álvaro; Faulín Fajardo, Javier; Estadística, Informática y Matemáticas; Estatistika, Informatika eta Matematika; Institute of Smart Cities - ISC; Universidad Pública de Navarra / Nafarroako Unibertsitate PublikoaThe rapid growth of electronic commerce is having an impact on the way urban logistics are organized. In metropolitan settings, the last-mile delivery problem, i.e., the problem regarding the final stage of delivering a shipment to a consumer, is a major concern due to its inefficiency. The development of a convenient automated parcel lockers (APLs) network improves last-mile distribution by reducing the number of vehicles, the distances driven, and the number of delivery stops. Using automated parcel lockers, the last-mile issue could be overcome for the environment’s benefit. This study aimed to define and validate an APL network containing hundreds of APLs with the use of an example made up of real case study data from the city of Pozna ´n in Poland. The goal of this research was to use mathematical programming for optimization and simulation to tackle the facility location problem for automated parcel lockers through a practical approach. Multi-criteria simulation-optimization analysis was used to assess the data. In fact, the simulation was carried out using Anylogic software and the optimization with the use of the Java programming language and CPLEX solver. Three years were simulated, allowing for comparable results for each year in terms of expenses, e-shoppers, APL users, and demand evolution, as well as achieving the city’s optimal locker usage. Finally, encouraging conclusions were obtained, such as the relationship between the demand and the number of lockers, along with the model’s limitations.Publication Open Access Locating a biorefinery in Northern Spain: decision making and economic consequences(Elsevier, 2019) Serrano Hernández, Adrián; Faulín Fajardo, Javier; Institute of Smart Cities - ISC; Gobierno de Navarra / Nafarroako Gobernua, IIM14196.RI1Biofuels are emerging as a prominent renewable and sustainable energy sources in developed countries. In this sense, this paper presents a case study in which a biorefinery has to be sited in Northern Spain. Thus, the strategic decision of locating such a facility is deeply investigated through strategic policy evaluation. Then, tactical decisions ranging from purchasing and transportation policies to storage protocols are carried out. Only local and limited biomass can be harvested for supplying the biorefinery through a heterogeneous vehicle fleet. Moreover two different and mutually exclusive storage strategies are evaluated: direct supply from crops to biorefinery and using intermediate-collectors. Additionally, crop exploitation factors and biorefinery sizes are used to generate several scenarios in which the strategic decision of location as well as all the tactic decisions are made. Some mixed integer linear programming models are proposed to figure out all relevant decision problems. The results suggest that the Northwest study area as the best option to locate the biorefinery and recommend the intermediate-collector storage strategy. Moreover, the key information about critical biomass, crops and times are also provided.Publication Open Access Determining an optimal area to locate a biorefinery under economic and environmental criteria(Elsevier BV, 2017) Serrano Hernández, Adrián; Faulín Fajardo, Javier; Pintor Borobia, Jesús María; Belloso Ezcurra, Javier; Institute for Advanced Materials and Mathematics - INAMAT2Facilities location is a strategic decision which has to be carefully considered because it could involve the failure or success of a business. For that reason, anything that helps decision makers to facilitate their location decision processes is of their utmost interest. The aim of this paper is, therefore, providing a methodology that could be useful for the decision makers by giving them not only an optimal point but also a whole region where they can focus on their attention. Knowing that biofuels are settling as a new alternative energy source which has been spreading around the world to reduce greenhouse gas emissions and oil dependence, this methodology is tested in the real case of locating a biorefinery in Navarre, Spain. Moreover, A Mixed Integer Linear Programming (MILP) model has been developed to generate optimal region vertices as well as some other supply chain characteristics, including, among others, which crops are going to be harvested, when they are going to be collected, and their storage levels. Additionally, two criteria were implemented in MILP model to create two optimal regions: one considering an economic criterion and other one minimizing environmental impact. As a result, two regions were drawn in the Navarrese territory that point out where a biorefinery should be located and how the supply chain should be designed.