This page has only limited features, please log in for full access.
Improving the eco-efficiency of municipalities in the provision of municipal solid waste (MSW) services is fundamental in the context of a circular economy. This study evaluates the eco-efficiency of a sample of Spanish municipalities, integrating the total cost as input, recyclable waste as desirable output, and unsorted waste as undesirable output. Following a pioneering approach, the weighted Russell directional distance model (a non-radial data envelopment analysis model) was employed, which allowed us to obtain a global inefficiency score and individual inefficiency scores for each variable integrated in the model. In the second stage of analysis, the potential factors affecting the previously computed inefficiency scores were investigated. The results indicated that one third of the municipalities evaluated were eco-efficient in the provision of MSW services with the total cost being the variable in which the municipalities exhibited the best performance. Moreover, the size of the municipalities, population served, population density, tourism, and availability of containers for separative collection of paper, glass, and plastic significantly affect the eco-efficiency of the municipalities. The findings of this study provide detailed information to support decision-making for the policy makers to improve the eco-efficiency of the municipalities in managing MSW.
Laura Delgado-Antequera; Germán Gémar; María Molinos-Senante; Trinidad Gómez; Rafael Caballero; Ramón Sala-Garrido. Eco-efficiency assessment of municipal solid waste services: Influence of exogenous variables. Waste Management 2021, 130, 136 -146.
AMA StyleLaura Delgado-Antequera, Germán Gémar, María Molinos-Senante, Trinidad Gómez, Rafael Caballero, Ramón Sala-Garrido. Eco-efficiency assessment of municipal solid waste services: Influence of exogenous variables. Waste Management. 2021; 130 ():136-146.
Chicago/Turabian StyleLaura Delgado-Antequera; Germán Gémar; María Molinos-Senante; Trinidad Gómez; Rafael Caballero; Ramón Sala-Garrido. 2021. "Eco-efficiency assessment of municipal solid waste services: Influence of exogenous variables." Waste Management 130, no. : 136-146.
The aim of this work is to design a multiobjective model to explain the behavior among military expenditures (MEs), the human development index, and the global peace index in countries belonging to the North Atlantic Treaty Organization (NATO) for the study period 2008–2016. In order to solve this problem, different decision variables have been considered: health expenditure, education expenditure, Gross Domestic Product (GDP), collected taxes, public debt, and R&D costs, which are related to health, education, and economic sectors. To determine the relationships among decision variables making up the objective functions and model constraints, different panel data models were estimated. The obtained results show that the major part of the NATO countries present a behavior which differs from what is efficient. In this context, this work highlights the path to follow by each country, such as the implementation of public budget policies in the health and education sectors, and for collected taxes and public debt, to achieve efficient solutions.
Patricio Vallejo-Rosero; M. Carmen García-Centeno; Laura Delgado-Antequera; Osvaldo Fosado; Rafael Caballero. A Multiobjective Model for Analysis of the Relationships between Military Expenditures, Security, and Human Development in NATO Countries. Mathematics 2020, 9, 23 .
AMA StylePatricio Vallejo-Rosero, M. Carmen García-Centeno, Laura Delgado-Antequera, Osvaldo Fosado, Rafael Caballero. A Multiobjective Model for Analysis of the Relationships between Military Expenditures, Security, and Human Development in NATO Countries. Mathematics. 2020; 9 (1):23.
Chicago/Turabian StylePatricio Vallejo-Rosero; M. Carmen García-Centeno; Laura Delgado-Antequera; Osvaldo Fosado; Rafael Caballero. 2020. "A Multiobjective Model for Analysis of the Relationships between Military Expenditures, Security, and Human Development in NATO Countries." Mathematics 9, no. 1: 23.
Francisco Martos Barrachina; Laura Delgado Antequera; Mónica Hernández Huelin; Ricardo Díaz Hidalgo. Patrones de consumo de alimentos en España. Revista Electrónica de Comunicaciones y Trabajos de ASEPUMA 2019, 20, 95 -130.
AMA StyleFrancisco Martos Barrachina, Laura Delgado Antequera, Mónica Hernández Huelin, Ricardo Díaz Hidalgo. Patrones de consumo de alimentos en España. Revista Electrónica de Comunicaciones y Trabajos de ASEPUMA. 2019; 20 (2):95-130.
Chicago/Turabian StyleFrancisco Martos Barrachina; Laura Delgado Antequera; Mónica Hernández Huelin; Ricardo Díaz Hidalgo. 2019. "Patrones de consumo de alimentos en España." Revista Electrónica de Comunicaciones y Trabajos de ASEPUMA 20, no. 2: 95-130.
In the last few years, the application of decision making to logistic problems has become crucial for public and private organizations. Efficient decisions clearly contribute to improve operational aspects such as cost reduction or service improvement. The particular case of waste collection service considered in this paper involves a set of economic, labor and environmental issues that translate into difficult operational problems. They pose a challenge to nowadays optimization technologies since they have multiple constraints and multiple objectives that may be in conflict. We therefore need to resort to multiobjective approaches to model and solve this problem, providing efficient solutions in short computational times. In particular, we consider four different objectives to model the waste collection problem: travel cost, route length balance, route time balance, and number of routes. We propose an iterated greedy algorithm coupled with a variable neighborhood search to minimize an achievement function to determine a good approximation to the Pareto front. The performance of our method is empirically analyzed on a set of instances (both generated and real), and compared with the well-known NSGA-II and SPEA2 methods. The comparison favors our proposal.
Laura Delgado-Antequera; Rafael Caballero; Jesús Sánchez-Oro; J Manuel Colmenar; Rafael Martí. Iterated greedy with variable neighborhood search for a multiobjective waste collection problem. Expert Systems with Applications 2019, 145, 113101 .
AMA StyleLaura Delgado-Antequera, Rafael Caballero, Jesús Sánchez-Oro, J Manuel Colmenar, Rafael Martí. Iterated greedy with variable neighborhood search for a multiobjective waste collection problem. Expert Systems with Applications. 2019; 145 ():113101.
Chicago/Turabian StyleLaura Delgado-Antequera; Rafael Caballero; Jesús Sánchez-Oro; J Manuel Colmenar; Rafael Martí. 2019. "Iterated greedy with variable neighborhood search for a multiobjective waste collection problem." Expert Systems with Applications 145, no. : 113101.
Composite indicators are becoming more relevant for evaluating the performance of water companies from a holistic perspective. Some of them are related with economic aspects, and others focus on social and environmental features. Consequently, a multidimensional evaluation is necessary for handling the great amount of information provided by multiple single indicators of a different nature. This paper presents a two-phase approach to evaluate the sustainability of water companies. First, a partial composite indicator for each dimension (social, environmental, economic) is obtained using multi-criteria decision making (MCDM). Then, a global indicator is obtained, in terms of the values reached in the previous stage for every partial indicator, by means an optimization problem rooted in data envelopment analysis (DEA). Our proposal offers the possibility of analyzing the performance of each water company under each dimension that characterizes the concept of sustainability, as well as a joint assessment including all the dimensions, facilitating the decision-making process. We apply it to evaluate the sustainability of 163 Portuguese water companies. The results show the strengths and weaknesses of each unit and serve as a guideline to decision-makers on the aspects for improving the performance of water utilities.
Fátima Pérez; Laura Delgado-Antequera; Trinidad Gómez; Delgado- Antequera. A Two-Phase Method to Assess the Sustainability of Water Companies. Energies 2019, 12, 2638 .
AMA StyleFátima Pérez, Laura Delgado-Antequera, Trinidad Gómez, Delgado- Antequera. A Two-Phase Method to Assess the Sustainability of Water Companies. Energies. 2019; 12 (13):2638.
Chicago/Turabian StyleFátima Pérez; Laura Delgado-Antequera; Trinidad Gómez; Delgado- Antequera. 2019. "A Two-Phase Method to Assess the Sustainability of Water Companies." Energies 12, no. 13: 2638.
Last reviews show how the Spanish consumption patterns have become away from the Mediterranean diet, traditionally consumed in Spain and widely supported by the nutritional expert community. Hence, the aim of this study is to explore and provide different alternatives to the current Spanish diet. The idea is to obtain a set of palatable diets fulfilling the nutritional requirements and conform the Mediterranean standards, while staying as close as possible to the current population pattern, under a budget constraint. In this context, different models are developed using multiobjective techniques. Additionally, this work defines an alternative diet more stable in comparison with the diets on the boundary of the feasible set. The consumption data used in this study is taken from Ministerio de Agricultura y Pesca, Alimentación y Medio Ambiente (in Spanish MAPAMA) that contains relevant information about the foods consumed in Spain. Using this data, each model has been solved with Matlab Software, obtaining different feasible diets, whose composition corresponds to the suggested daily intake for a Spanish adult. In any case, the budget constraint reduces the current cost and fulfills the nutritional requirements, attending to the Mediterranean standards. Results show different food baskets to guide the current Spanish diet towards the consumption of healthy foods in the appropriate proportions, going back to the diet traditionally consumed.
Mónica Hernández; Trinidad Gómez; Laura Delgado-Antequera; Rafael Caballero. Using multiobjective optimization models to establish healthy diets in Spain following Mediterranean standards. Operational Research 2019, 1 -35.
AMA StyleMónica Hernández, Trinidad Gómez, Laura Delgado-Antequera, Rafael Caballero. Using multiobjective optimization models to establish healthy diets in Spain following Mediterranean standards. Operational Research. 2019; ():1-35.
Chicago/Turabian StyleMónica Hernández; Trinidad Gómez; Laura Delgado-Antequera; Rafael Caballero. 2019. "Using multiobjective optimization models to establish healthy diets in Spain following Mediterranean standards." Operational Research , no. : 1-35.
We propose a novel combination of an interactive multiobjective navigation method and a trade-off free way of asking and presenting preference information. The NAUTILUS Navigator is a method that enables the decision maker (DM) to navigate in real time from an inferior solution to the most preferred solution by gaining in all objectives simultaneously as (s)he approaches the Pareto optimal front. This means that, while the DM reaches her/his most preferred solution, (s)he avoids anchoring around the starting solution and, at the same time, sees how the ranges of the reachable objective function values shrink without trading-off. The progress of the motion towards the Pareto optimal front is also shown and, thanks to the graphical user interface, this information is available in an understandable form. The DM provides preference information to direct the movement in terms of desirable aspiration levels for the objective functions, bounds that are not to be exceeded as well as the motion speed. At any time, (s)he can change the navigation direction and even go backwards if needed. One of the major advantages of this method is its applicability to any type of problem, as long as an approximation set of the Pareto optimal front is available and, particularly, to problems with time-consuming function evaluations. Its functionality is demonstrated with an example problem.
Ana B. Ruiz; Francisco Ruiz; Kaisa Miettinen; Laura Delgado-Antequera; Vesa Ojalehto. NAUTILUS Navigator: free search interactive multiobjective optimization without trading-off. Journal of Global Optimization 2019, 74, 213 -231.
AMA StyleAna B. Ruiz, Francisco Ruiz, Kaisa Miettinen, Laura Delgado-Antequera, Vesa Ojalehto. NAUTILUS Navigator: free search interactive multiobjective optimization without trading-off. Journal of Global Optimization. 2019; 74 (2):213-231.
Chicago/Turabian StyleAna B. Ruiz; Francisco Ruiz; Kaisa Miettinen; Laura Delgado-Antequera; Vesa Ojalehto. 2019. "NAUTILUS Navigator: free search interactive multiobjective optimization without trading-off." Journal of Global Optimization 74, no. 2: 213-231.
Real-world situations often result in optimization problems with conflicting objectives for which the search space is constrained by several factors. In particular, performing an effective solution brings quantifiable benefits to companies in charge of the waste collection in urban areas, which are currently investing time and effort to improve their services in terms of financial, social and environmental objectives, while bearing in mind labor factors. In this work, we model a real waste collection problem as a Capacitated Vehicle Routing Problem (CVRP) with two objectives: travel cost minimization and route balancing. To generate the best approximation of the Pareto front, we develop a multi-phase procedure. The first phase constructs solutions in a semi-greedy fashion; the second phase seeks to improve those solutions with a local search; and the third phase consists of a pairwise path-relinking search. Finally, we apply it to real-world data of the problem that motivated this work.
Laura Delgado-Antequera; Manuel Laguna; Joaquín Pacheco; Rafael Caballero. A bi-objective solution approach to a real-world waste collection problem. Journal of the Operational Research Society 2019, 71, 183 -194.
AMA StyleLaura Delgado-Antequera, Manuel Laguna, Joaquín Pacheco, Rafael Caballero. A bi-objective solution approach to a real-world waste collection problem. Journal of the Operational Research Society. 2019; 71 (2):183-194.
Chicago/Turabian StyleLaura Delgado-Antequera; Manuel Laguna; Joaquín Pacheco; Rafael Caballero. 2019. "A bi-objective solution approach to a real-world waste collection problem." Journal of the Operational Research Society 71, no. 2: 183-194.
Laura Delgado-Antequera. Nuevas estrategias para resolver el problema multiobjetivo de la recogida de basura. Una aplicación real al caso de Málaga. Revista Electrónica de Comunicaciones y Trabajos de ASEPUMA 2018, 19, 63 -79.
AMA StyleLaura Delgado-Antequera. Nuevas estrategias para resolver el problema multiobjetivo de la recogida de basura. Una aplicación real al caso de Málaga. Revista Electrónica de Comunicaciones y Trabajos de ASEPUMA. 2018; 19 (1):63-79.
Chicago/Turabian StyleLaura Delgado-Antequera. 2018. "Nuevas estrategias para resolver el problema multiobjetivo de la recogida de basura. Una aplicación real al caso de Málaga." Revista Electrónica de Comunicaciones y Trabajos de ASEPUMA 19, no. 1: 63-79.
The aim of this paper is to propose a framework in order to solve the real-world waste collection problem in a city of southern Spain modeled as an Asymmetric Vehicle Routing Problem (AVRP) with side constraints and several variations. In this problem, not only are vehicle capacity and temporal constraints considered but multiple trips are also allowed. Furthermore, two objectives will be considered: the minimization of the total distance and the balance of the working day. Finally, in order to select a single solution among all efficient (or nondominated) solutions, an interactive method is designed using reference points.
L. Delgado-Antequera; Fatima Perez; A. G. Hernández-Díaz; A. D. López-Sánchez. An Interactive Biobjective Method for Solving a Waste Collection Problem. Mathematical Problems in Engineering 2016, 2016, 1 -8.
AMA StyleL. Delgado-Antequera, Fatima Perez, A. G. Hernández-Díaz, A. D. López-Sánchez. An Interactive Biobjective Method for Solving a Waste Collection Problem. Mathematical Problems in Engineering. 2016; 2016 ():1-8.
Chicago/Turabian StyleL. Delgado-Antequera; Fatima Perez; A. G. Hernández-Díaz; A. D. López-Sánchez. 2016. "An Interactive Biobjective Method for Solving a Waste Collection Problem." Mathematical Problems in Engineering 2016, no. : 1-8.