4 research outputs found

    A hybrid egalitarian bargaining game-DEA and sustainable network design approach for evaluating, selecting and scheduling urban road construction projects

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    Selecting and scheduling urban road construction projects (URCPs) is inherently an Urban Network Design Problem (UNDP) with a complex decision making process. Recently some studies have focused on sustainable UNDP, using different mathematical methods. In this paper, first a new network data envelopment analysis (NDEA) model has been developed. Then, considering sustainability dimensions, by integrating data envelopment analysis (DEA), game theory and sustainable UNDP, a bi-level model has been proposed for selecting and scheduling URCPs. A meta-heuristic algorithm is proposed to solve the presented bi-level model. Different test instances are solved to show the acceptable performance of proposed algorithm in both solution quality and execution time. Afterwards, the proposed model is applied to study the problem of urban road construction projects selection in a real-world case study of urban transportation network of Isfahan city in Iran. The results show that by applying obtained solution the environmental and social performance of the network has been improved and the performance of the network is almost efficient in all evaluation periods

    Determining the relative importance of sustainability evaluation criteria of urban transportation network

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    A truly sustainable urban transportation network (SUTN) needs to be sustainable in all aspects including economic, social and environmental dimensions. Identifying the evaluation criteria for sustainability of urban transportation network (UTN) and evaluating importance of these criteria, are completely critical. While most researches have only focused on economic aspect of transportation systems (TSs), in this paper, by considering economic, social and environmental dimensions, the evaluation criteria for evaluating the sustainability of UTN have been identified. Then a framework based on Best Worst Method, has been proposed to evaluate and prioritize sustainability dimensions and evaluation criteria. To show the usefulness of the proposed model, it is applied to a real-world case study of transportation in Isfahan, one of the largest cities in Iran. The results from this study are used for evaluating and selecting real transportation projects. We have also shown how the proposed framework helps managers and experts for analyzing sustainability of existing UTN, identifying potential strategies, evaluating and selecting new policies or constructing projects to achieve sustainability goals

    Analysis of Interrelated Network Improvement Alternatives

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    69A43551747123This project developed methods for optimizing the long-term development of road networks by developing algorithms for selecting, sequencing and scheduling interrelated improvements, which change flows through the networks. It also compared how network performance can be evaluated as a network\u2019s configuration evolves, using either a fast traffic assignment algorithm or the slower but more realistically precise microscopic simulation model INTEGRATION. The results indicate when and to what extent the traffic assignment algorithm can approximate the simulation results. They demonstrate the potential value of hybrid methods in combining initial search with traffic assignment and refined search with microscopic simulation

    Modelos de optimizaci贸n para el dise帽o estrat茅gico-t谩ctico de una red de transporte intermodal

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    [ES] En esta tesis doctoral se desarrollan modelos de programaci贸n matem谩tica para el dise帽o estrat茅gico-t谩ctico de una red de transporte intermodal que combina dos tipos de problemas de decisiones: la localizaci贸n de instalaciones y el dise帽o de la red de transporte. Esta combinaci贸n se reconoce en la literatura como problemas combinados LI-DR. El problema combinado se estudia para una situaci贸n real y se analizan el comportamiento de la soluci贸n 贸ptima, a partir de distintos aspectos como: la disponibilidad del presupuesto de inversi贸n, capacidad de las instalaciones intermodales, m煤ltiples periodos de decisiones, interdependencia en la priorizaci贸n de las decisiones, m煤ltiples fuentes de financiaci贸n y criterios de optimizaci贸n para las tres dimensiones de sostenibilidad. Para la situaci贸n real se referencian las condiciones de acceso y conectividad de la Zona de Desarrollo Econ贸mico y Social (ZODES) Magdalena Medio del departamento de Bol铆var en Colombia, y el potencial de la industria agroalimentaria para esta subregi贸n. Con el prop贸sito de identificar factores clave que perfilen la formulaci贸n respecto a la composici贸n y funcionamiento de los sistemas intermodales y en los problemas combinados LI-DR se analiza la literatura desde estas dos perspectivas. El an谩lisis de la literatura ha permitido aportar dos clasificaciones novedosas e identificar retos para la investigaci贸n futura. Para la formulaci贸n de los modelos se lleva a cabo la sistem谩tica de pasos definidos para la aplicaci贸n de las t茅cnicas de programaci贸n matem谩tica. Con estos pasos se logra transformar el problema del mundo real a un problema manejable con estas t茅cnicas. La transformaci贸n favorece la interpretaci贸n matem谩tica del problema combinado LI-DR intermodal, la modelaci贸n de los datos y la definici贸n de una estructura de red de entrada para indexar las decisiones estrat茅gicas y t谩cticas. Los modelos de programaci贸n matem谩tica se construyen de manera gradual. En concreto, se proponen 2 versiones que se representan en 5 variantes. Se comienza formulando un modelo de programaci贸n lineal entero-mixto (MPLEM) mono-periodo para analizar, desde un enfoque econ贸mico, la sensibilidad de las capacidades del sistema intermodal, la capacidad financiera de los tomadores de decisiones y la variaci贸n de la demanda. A continuaci贸n, sobre la base de este modelo se propone un MPLEM multi-periodo y dos variantes para validar las condiciones de interdependencia en la toma de decisiones estrat茅gica y la participaci贸n de m煤ltiples actores en la financiaci贸n de los proyectos de inversi贸n. Finalmente, se formula un MPLEM multi-objetivo para optimizar simult谩neamente las tres dimensiones de sostenibilidad. Para resolver y validar los modelos se implementaron dos esquemas de resoluci贸n. En los esquemas se utilizan los lenguajes de programaci贸n R y Python con el software de optimizaci贸n matem谩tica Gurobi Optimizer. Se realizan experimentos num茅ricos para distintos escenarios y se analiza el comportamiento de las soluciones considerando distintos valores a los par谩metros. Los resultados obtenidos permiten comprobar la utilidad de los modelos matem谩ticos e identificar las principales limitaciones y futuras l铆neas de trabajo.[CA] En aquesta tesi doctoral es desenvolupen models de programaci贸 matem脿tica per al disseny estrat猫gic-t脿ctic d'una xarxa de transport intermodal que combina dos tipus de problemes de decisions: la localitzaci贸 d'instal路lacions i el disseny de la xarxa de transport. Aquesta combinaci贸 es reconeix en la literatura com problemes combinats LI-DR. El problema combinat s'estudia per a una situaci贸 real i s'analitzen el comportament de la soluci贸 貌ptima, a partir de diferents aspectes com: la disponibilitat de l'pressupost d'inversi贸, capacitat de les instal路lacions intermodals, m煤ltiples per铆odes de decisions, interdepend猫ncia en la prioritzaci贸 de les decisions, m煤ltiples fonts de finan莽ament i criteris d'optimitzaci贸 per a les tres dimensions de sostenibilitat. Per a la situaci贸 real es referencien les condicions d'acc茅s i connectivitat de la Zona de Desenvolupament Econ貌mic i Social (ZODES) Magdalena Medio de el departament de Bol铆var a Col貌mbia, i el potencial de la ind煤stria agroaliment脿ria per a aquesta subregi贸. Amb el prop貌sit d'identificar factors clau que perfilin la formulaci贸 respecte a la composici贸 i funcionament dels sistemes intermodals i en els problemes combinats LI-DR s'analitza la literatura des d'aquestes dues perspectives. L'an脿lisi de la literatura ha perm猫s aportar dues classificacions noves i identificar reptes per a la investigaci贸 futura. Per a la formulaci贸 dels models es porta a terme la sistem脿tica de passos definits per l'aplicaci贸 de les t猫cniques de programaci贸 matem脿tica. Amb aquests passos s'aconsegueix transformar el problema de l'm贸n real a un problema manejable amb aquestes t猫cniques. La transformaci贸 afavoreix la interpretaci贸 matem脿tica de el problema combinat LI-DR intermodal, la modelaci贸 de les dades i la definici贸 d'una estructura de xarxa d'entrada per indexar les decisions estrat猫giques i t脿ctiques. Els models de programaci贸 matem脿tica es construeixen de manera gradual. En concret, es proposen 2 versions que es representen en 5 variants. Es comen莽a formulant un model de programaci贸 lineal sencer-mixt (MPLEM) mono-per铆ode per analitzar, des d'un enfocament econ貌mic, la sensibilitat de les capacitats de sistema intermodal, la capacitat financera dels prenedors de decisions i la variaci贸 de la demanda. A continuaci贸, sobre la base d'aquest model es proposa un MPLEM multi-per铆ode i dues variants per validar les condicions d'interdepend猫ncia en la presa de decisions estrat猫gica i la participaci贸 de m煤ltiples actors en el finan莽ament dels projectes d'inversi贸. Finalment, es formula un MPLEM multi-objectiu per optimitzar simult脿niament les tres dimensions de sostenibilitat. Per resoldre i validar els models es van implementar dos esquemes de resoluci贸. En els esquemes s'utilitzen els llenguatges de programaci贸 R i Python amb el programari d'optimitzaci贸 matem脿tica Gurobi Optimizer. Es realitzen experiments num猫rics per a diferents escenaris i s'analitza el comportament de les solucions considerant diferents valors als par脿metres. Els resultats obtinguts permeten comprovar la utilitat dels models matem脿tics i identificar les principals limitacions i futures l铆nies de treball.[EN] In this doctoral thesis, mathematical programming models are developed aiming at the strategic-tactical design of an intermodal transport network that combines two types of decision problems: the location of facilities and the transport network design. In the literature, this combination is recognized as combined LI-DR problems. The combined problem is studied for a real situation and the performance of the optimal solution is analyzed in relation to different aspects such as the investment budget availability, the intermodal facilities capacity, multiple decision periods, interdependence in the prioritization of the decisions, multiple sources of funding and optimization criteria for the three dimensions of sustainability. In what concern to the real situation, the access and connectivity conditions of the Magdalena Medio Economic and Social Development Zone (ZODES, for its acronym in Spanish) of the Bol铆var department in Colombia, and the potential of the agri-food industry for this subregion, are considered. Aiming the identification of key factors that outlines the formulation regarding the composition and operation of intermodal systems and, in combined LI-DR problems, the literature is reviewed from these two perspectives. The literature analysis has made it possible to provide two novel classifications and to identify challenges for future research. The formulation of models follows the systematic steps already defined for the application of mathematical programming techniques. Following these steps, it is possible to transform the problem from a real-world problem to a manageable one. The transformation promotes the mathematical interpretation of the intermodal LI-DR combined problem, the data modeling, and the definition of an input network structure to index strategic and tactical decisions. Mathematical programming models are built gradually. Specifically, 2 versions are proposed, which are represented by 5 variants. Firstly, it is formulated a single-period mixed-integer linear programming model (MILPM) in order to analyze, from an economic perspective, the sensitivity of the intermodal system capacities, the financial capacity of the decision-makers, and the demand changes. Based on the aforementioned model, a multi-period MILPM and two variants are proposed aiming to validate the conditions of interdependence in strategic decision-making and the participation of multiple actors in the investment projects financing. Finally, a multi-objective MILPM is formulated to simultaneously optimize all three dimensions of sustainability. To solve and validate the models, two resolution schemes were implemented. The schematics use the R and Python programming languages with the mathematical optimization software Gurobi Optimizer. Numerical tests are carried out for different scenarios and the performance of the solutions is analyzed considering different values for the parameters. The results obtained allow us to verify the usefulness of the models proposed and identify the main limitations and future lines of work.Agamez Arias, ADM. (2021). Modelos de optimizaci贸n para el dise帽o estrat茅gico-t谩ctico de una red de transporte intermodal [Tesis doctoral]. Universitat Polit猫cnica de Val猫ncia. https://doi.org/10.4995/Thesis/10251/177015TESI
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