PUBLICATIONS

  1. Serna-Montoya, L. F., Saldarriaga-Zuluaga, S. D., López-Lezama, J. M., Muñoz-Galeano, N., & Villegas, J. G. (2025). Integrated Curve and Setting Optimization for DOCRs in Microgrid Environments with a BRKGA-MILP Matheuristic. Energies, 18(23), 6276. https://doi.org/10.3390/en18236276 (open access)
  2. Arenas-Vasco, A. , Alcázar, D. & Villegas, J.G. (2025).  A meta-analysis of set partitioning/set covering based matheuristics for vehicle routing problems, Operations Research Perspectives, 15, 100357, https://doi.org/10.1016/j.orp.2025.100357  (open access)
  3. Fernandez, J.P., Villegas, J. G., & Camacho-Vallejo, J.F., (2025). A simple and effective exact method for the medianoid problem with multipurpose trips. Computational Optimization and Applications, https://doi.org/10.1007/s10589-025-00731-7 (time-limited free access)
  4. Villegas, J. G., Álvarez-López, G., Jaramillo, L. Y., & Romero-Sáez, M. (2025). Supply Chain (Re)Design and Pricing for Biomass Ash Valorization as Supplementary Cementitious Materials. Recycling, 10(2), 34. https://doi.org/10.3390/recycling10020034 (open access)
  5. Bedoya S., Mejía, JL, Maya-Duque, P. & Villegas, J.G. (2024) A multiobjective maximal covering/p-dispersion model for reverse vending machine location. In: Evolution and Trends of Sustainable Approaches. Elsevier, 111-127. https://doi.org/10.1016/B978-0-443-21651-0.00015-2
  6. Muriel, J.E., Zhang,L. Fransoo, J.C. & Villegas, J.G. (2024). A Reinforcement Learning Framework for Improving Parking Decisions in Last-Mile Delivery. Transportmetrica B: Transport Dynamics, 12:1, 2337216 . doi: 10.1080/21680566.2024.2337216 
  7. Camacho-Vallejo, J.F., Corpus, C. & Villegas, J.G (2024). Metaheuristics for bilevel optimization: A comprehensive review, Computers & Operations Research, 161, 106410, https://doi.org/10.1016/j.cor.2023.106410
  8. Villegas, J.G., Montoya-Torres, J.R., Guerrero, W.J. (2023). An Overview of Operations Research/Management Science in Latin America. In: Montoya-Torres, J.R., Guerrero, W.J., Cortés-Murcia, D.L. (eds) Operations Research and Analytics in Latin America. Lecture Notes in Operations Research. Springer, Cham. https://doi.org/10.1007/978-3-031-28870-8_1
  9. Polino, S. Camacho-Vallejo, J.F & Villegas, J.G. (2023). A facility location problem for extracurricular workshop planning: bilevel model and metaheuristics. International Transactions in Operational Research. https://doi.org/10.1111/itor.13368
  10. Arenas-Vasco, A. , Aguirre-González, E.J., Camacho, C. & Villegas, J.G. (2024). Among Us as an Operations Research Problem. INFORMS Transactions on Education. 24 (3) 282-284. https://doi.org/10.1287/ited.2022.0029
  11. Álvarez-López, G.; Múnera, A.M. & Villegas, J.G. (2023)  Multicriteria Decision-Making Tools for the Selection of Biomasses as Supplementary Cementitious Materials. Sustainability 2023, 15, 10031. [Open access]
  12. Vargas, A. P., Díaz, D., Jaramillo, S., Rangel, F., Villa, D. & Villegas, J. G. (2022). Improving the tactical planning of solid waste collection with prescriptive analytics: a case study. Production, 32, e20210037. https://doi.org/10.1590/0103-6513.20210037.
  13. Llerena-Riascos C, Jaén S, Montoya-Torres J.R, & Villegas J.G.  An Optimization-Based System Dynamics Simulation for Sustainable Policy Design in WEEE Management Systems. Sustainability. 2021; 13(20):11377. https://doi.org/10.3390/su132011377 [Open access]
  14. Villegas J.G., Castañeda P. C., & Castañeda-Gómez E. Planning and performance measurement in higher education: three case studies of operational research application. Revista Facultad De Ingeniería Universidad De Antioquia (100), 97-112. 2021. https://doi.org/10.17533/udea.redin.20210526 [Open access]
  15. J.E. Sierra-Aguilar, C.C. Marín-Cano, J.M. López-Lezama, Á Jaramillo-Duque and J.G. Villegas. A New Affinely Adjustable Robust Model for Security Constrained Unit Commitment under Uncertainty. Applied Sciences. 2021, 11(9), 3987. DOI: https://doi.org/10.3390/app11093987
  16. C.C. Marín-Cano, J.E. Sierra-Aguilar, J.M. López-Lezama, Á Jaramillo-Duque and J.G. Villegas. A Novel Strategy to Reduce Computational Burden of the Stochastic Security Constrained Unit Commitment Problem. Energies 13 (15), 3777, 2020. DOI:https://doi.org/10.3390/en13153777 [open access at publisher]
  17. R. Restrepo and J.G. Villegas. Supplier evaluation and classification in a Colombian motorcycle assembly company using data envelopment analysis. ARLA-Academia Revista Latinoamericana de Administración, 32(2), 159-180, 2019. DOI: 10.1108/ARLA-04-2017-0107
  18. S. Roman, A.M. Villegas, and J.G. Villegas. An evolutionary strategy for multiobjective reinsurance optimization. Journal of the Operational Research Society, 69(10), 1661-1677. 2018. DOI: 10.1057/s41274-017-0210-y
  19. A.F. Pérez-Posada, J.G. Villegas and J.M. López-Lezama. A scatter search heuristic for the optimal location, sizing and contract pricing of distributed generation in electric distribution systems. Energies, 10(10) 1449.  2017. [open access at publisher]
  20. A. Montoya, C. Guéret, J.E. Mendoza, and J.G. Villegas. The electric vehicle routing problem with nonlinear charging function. Transportation Research Part B, 103, 87-110, 2017. [see at publisher].
  21. C. Castañeda and  J.G. Villegas. Analyzing the response to traffic accidents in Medellín, Colombia, with facility location models. IATSS Research, 41, 47-56, 2017. [see at publisher]. Open access thanks to IATSS.
  22. J.E.Muriel, K.C. Alvarez, C.E. Patiño-Rodríguez and J.G. Villegas.  Analysis of transportation networks subject to natural hazards – Insights from a Colombian case. Reliability Engineering & System Safety, 152,151–165,2016.[see at publisher]
  23. A. Montoya, M.C. Vélez-Gallego, J.G. Villegas. Multi-product capacitated facility location problem with general production and building costs. Netnomics, 17(1), 47-70, 2016.[open access thanks to the publisher]
  24. A. Montoya, C. Guéret, J.E. Mendoza, and J.G. Villegas. A multi-space sampling heuristic for the green vehicle routing problem. Transportation Research Part C: Emerging Technologies, 70,113-128 2016 [see at publisher]
  25. J.E. Mendoza, L.-M. Rousseau and J.G. Villegas. A hybrid metaheuristic for the vehicle routing problem with stochastic demand and duration constraints. Journal of Heuristics, 22 (4), 539-566, 2016.  [open access thanks to the publisher]
  26. J. M. Belenguer, E. Benavent, A. Martinéz-Sykora, C. Prins, C. Prodhon, and J.G. Villegas. A branch-and-cut algorithm for the single truck and trailer routing problem with satellite depots. Transportation Science 50(2), 735-749, 2016. [see at publisher].
  27. E.A. Alvarez-Tobón, P.A. Velásquez-Restrepo, and J.G. Villegas. Analyzing the capacity of the IPS Universitaria surgery service via integer programming. Revista Ingeniería Biomédica 9(18) Julio-diciembre de 2015. pp. 127-132.[see at publisher]
  28. J.E. Mendoza, J.G. Villegas. A multi-space sampling approach for the vehicle routing problem with stochastic demands. Optimization Letters, 7(7), 1503–1516, 2013. [see at publisher]
  29. J.G. Villegas, C. Prins, C. Prodhon, A. L. Medaglia, and N. Velasco. A matheuristic for the truck and trailer routing problem. European Journal of Operational Research, 230(2), 231-244, 2013. [see at publisher]
  30. J.G. Villegas. Vehicle routing problems with trailers [Ph.D. Thesis Abstract]. 4-OR- A Quarterly Journal of Operations Research, 10 (3) , 317-318, 2012.  [see at publisher]
  31. J.G. Villegas, C. Prins, C. Prodhon, A. L. Medaglia, and N. Velasco. GRASP with evolutionary path relinking for the truck and trailer routing problem. Computers & Operations Research, 38, 1319-1334, 2011. [see at publisher]
  32. J.G. Villegas, C. Prins, C. Prodhon, A.L. Medaglia and N. Velasco.. GRASP/VND and multi-start evolutionary local search for the single truck and trailer routing problem with satellite depots. Engineering Applications of Artificial Intelligence, 23,780–794, 2010.  [see at publisher]
  33. A.L. Medaglia, J.G. Villegas, and D.M. Rodríguez-Coca. Hybrid biobjective evolutionary algorithms for the design of a hospital waste management network. Journal of Heuristics 15,153-176, 2009.  [open access thanks to the publisher]
  34. A.F. Correa, H.M. Gomez, J.F.  Loaiza, D.C. Lopera and J.G. Villegas. Características del diseño de rutas de distribución de alimentos en el Valle de Aburra. Revista Facultad de Ingeniería Universidad de Antioquia  45, 172-180, 2008. [see at publisher]
  35. M.I. Restrepo and J.G.  Villegas. Clasificación de grupos de investigación con análisis envolvente de datos.  Revista Facultad de Ingeniería Universidad de Antioquia  42, 105-119, 2007. [see at publisher]
  36. E.V. Gutierrez, J.D. Palacios and J.G. Villegas.  Reseña del Software disponible en Colombia para el diseño de rutas de distribución y servicios.  Revista Universidad EAFIT  43 (145), 60 – 80 ,2007. [see at publisher]
  37. A.L. Medaglia, E. Gutiérrez, and J.G. Villegas. Solving facility location problems using a tool for rapid development of multi-objective evolutionary algorithms (MOEAs). In: Handbook of Research on Nature Inspired Computing for Economics and Management. Jean-Phillipe Rennard (Ed.) Vol 2. 642-660, 2006.
  38. J.G. Villegas, F. Palacios and A.L. Medaglia. Solution methods for the bi-objective (cost-coverage) unconstrained facility location problem with an illustrative example. Annals of Operations Research. 147(1): 109-141, 2006.  [open access thanks to the publisher]
  39. J.G. Villegas. Problemas de Localización multiobjetivo.  Artículos Maestría en Ingeniería. Vol 1. 2004. Bernardo Caicedo (Compilador) Universidad de Los Andes, Facultad de Ingeniería, Ediciones Uniandes. 479-502, 2005.

THESIS

  1. Vehicle routing problems with trailers.  Ph.D. Thesis. Advisors: Andrés L. Medaglia (Universidad de los Andes – Colombia), and Christian Prins (Université de Technologie de Troyes – France). Coadvisors: Nubia Velasco (Universidad de los Andes – Colombia) and Caroline Prodhon (Université de Technologie de Troyes – France),  2010. [pdf].
  2. Improved GRASP hybrids for the capacitated vehicle routing problem. M.Sc. thesis – Applied  Mathematics. (In Spanish- Heurísticos GRASP híbridos para el problema de rutas de vehículos con restricciones de capacidad. Advisor: Hermilson  Velásquez (Universidad Eafit),  2008.[pdf]
  3. Multiobjective facility location problems. M.Sc. thesis – Industrial Engineering.  (In Spanish- Problemas de localización multi-objetivo). Advisor: Fernando E. Palacios (Universidad de los Andes – Colombia). Coadvisor: Andrés L. Medaglia (Universidad de los Andes – Colombia), 2003. [pdf]

WORKING PAPERS

  1. J.C. España & J.E.Muriel, C.E. Patiño and J.G. Villegas.  Supply chain resilience under road-network disruptions – a simulation and optimization framework to evaluate supply chain strategies.  2024.
  2. Fernández-Gutiérrez, J.P., Camacho-Vallejo, J.F & Villegas, J.G.  A Simple and Effective Exact Method for the Medianoid Problem with Multipurpose Trips. Under review. 2024.

       PROFESSIONAL PUBLICATIONS AND TECHNICAL NOTES

  1. J.G. Villegas , C.Castañeda  and K. A. Blandón. Modelos de localización para el mejoramiento de la atención pre hospitalaria de accidentes de tránsito, en Medellín. In: Fortaleciendo el sector académico para reducir los siniestros de tránsito en América Latina: Investigaciones y casos de estudio en seguridad vial.  Taddia, Alejandro; Pinto, Ana María; Café, Eduardo; Rodríguez, Manuel; Viegas, Michelle; De la Peña Mendoza, Sissi Maribel; Da Costa, Rafael Cesar; Saucedo, Rubén (Editors). Banco Interamericano de Desarrolo, 2014. [pdf in Spanish] [pdf in Portuguese]

           TECHNICAL REPORTS

  1. M.I. Restrepo & J.G. Villegas. Análisis Envolvente de Datos: Introducción y herramienta pública para su utilización. Departamento de Ingeniería Industrial. Universidad de Antioquia. 2007. [To download the technical report click here]. [To download the toolbox click here].
  2. A. Guarín, A. Ramírez Hassan, and  J.G. Villegas. Fast reaction police units in Medellín: A budget-constrained maximal homicide covering location approach. Borradores de Economía 908. Banco de la República de Colombia, 2015. [To download the technical report click here]
  3. A. Montoya, C. Guéret, J.E. Mendoza, and J.G. Villegas.  The technician routing and scheduling problem with conventional and electric vehicles 〈hal-01813887〉.

CONFERENCE PROCEEDINGS

  1. C. Camacho, G.A. Álvarez &  J.G. Villegas. Mathematical model for the tactical planning of the supply chain of supplementary cementitious materials. In: Aristizábal-Sierra, R (Ed.)  Engineering for Transfoemation – International Congress EXPOIngeniería 2022, Medellín, October 27-29, 2022, pp. 355-362 [download]
  2. Corcho, R.A. , Villegas, J.G., Maya, P. Milk collection optimization in Atlántico, Colombia. Proceedings of the International Conference on Industrial Engineering and Operations Management, 2021, pp. 1161–1162
  3. Ramirez-Malule, D., Jaén-Posada, J.S., Villegas, J.G. A system dynamics model for warehouse performance measurement with highly seasonal demand and with long and short life products. Proceedings of the International Conference on Industrial Engineering and Operations Management, 2021, pp. 1465–1475
  4. Camacho-Vallejo, J.F, Polino, S., Villegas, J.G. (2021) 9th International Workshop on Numerical and Evolutionary Optimization. An Algorithm Based in the Path Relinking Metaheuristic for Solving a Location Bilevel Problem: an Application to a Social Responsibility Project. p.70
  5. Vargas, A. P., Díaz, D., Jaramillo, S., Rangel, F., Villa, D. & Villegas, J. G. (2021). Optimization models for the tactical planning of the solid waste collection operation: Case study in Colombia. International Conference of Production Research-Americas -ICPR-Americas  2020. p.p. 281- 292
  6. Gómez González, A. Rivera, J.C., Villegas. J.G. Periodic vehicle routing with consistency and synchronization constraints for nanostore fulfillment in emerging markets. International Conference of Production Research-Americas -ICPR-Americas  2020.  2597-2600
  7. A.M. Múnera, G.A. Álvarez, J.G. Villegas, K. Arango, M. Romero, l. Y. Jaramillo, J.D. Martinez, C.N. Arenas, Aplicación del Proceso Analítico Jerárquico para la selección de residuos agroindustriales en la obtención de materiales cementantes suplementarios, in: E. Chemes (Ed.), Anales del XXXIII ENDIO-EPIO y Red Iberoameticana Evaluación y Decisión Multicriterio IX, Córdoba, 2020: pp. 231–235. [https://www.epio.net.ar/anales-de-los-encuentros/]
  8. A.Tejada, O. Usuga, J.G. Villegas. A GRASP metaheuristic for a districting problem arising in urban distribution. XIII Metaheuristic International Conference, Cartagena (Colombia),  July 28-31, 2019. [pdf]
  9. S. Cortes, E. V. Gutiérrez, J. D. Palacio and J. G. Villegas. Districting Decisions in Home Health Care Services: Modeling and Case Study. 5th Workshop on Engineering Applications, WEA 2018, Medellín, Colombia, October 17–19, 2018. Communications in Computer and Information Science  Vol 916, p.p. 73–84, 2018.DOI:[10.1007/978-3-030-00353-1_7]
  10. A.Tejada, O. Usuga, J.G. Villegas. Metodología de zonificación de clientes para la distribución urbana de mercancías en compañías de consumo masivo. 9th International Conference on Production Research – Americas 2018, Bogotá (Colombia),  July 17-19, 2018. [pdf]
  11. J.E. Mendoza, A. Montoya, C. Guéret, J.G. Villegas. Routing a hybrid fleet of conventional and electric vehicles: the case of a French utility. 7th International Workshop on Freight Transportation and Logistics, ODYSSEUS 2018. Cagliari, Italy, June 3-8, 2018.
  12. E.J. Aguirre-Gonzalez, and J.G. Villegas. A two-phase heuristic for the collection of waste animal tissue in a Colombian rendering industry. 4th Workshop on Engineering Applications, WEA 2017, Cartagena, Colombia, September 27-29, 2017. Communications in Computer and Information Science  Vol 742, p.p. 511-521, 2017. DOI: [10.1007/978-3-319-66963-2_45]
  13. J.E. Mendoza, A. Montoya, C. Guéret, J.G. Villegas. A parallel matheuristic for the technician routing problem with electric and conventional vehicles. XII Metaheuristics International Conference (MIC). Barcelona, Spain,  July 4-7, 2017.
  14. A. Montoya, C. Guéret, J.E. Mendoza, and J.G. Villegas. The electric vehicle routing problem with non-linear charging functions. 6th International Workshop on Freight Transportation and Logistics, ODYSSEUS 2015. Ajaccio (France) May 31-June 5, 2015. [pdf]
  15. A. Cadavid-Tobón, P. A. Maya-Duque and J.G. Villegas. Robust Flight Scheduling in a Colombian Domestic Airline. Proceedings of the International Conference on Operations Research and Enterprise Systems (ICORES-2015), Lisbon (Portugal) -January 10-12,  pp. 156-161. DOI: 10.5220/0005220401560161
  16. J.E. Muriel, K.C. Alvárez, J.G. Villegas and C.E. Patiño. Impacto de fenómenos naturales en la confiabilidad de vías de transporte interurbanas: caso aplicado a una red vial colombiana. XVII Joint ALIO/SMIO Conference on Operations Research  (CLAIO 2014). Monterrey (Mexico) – October 6th-10th, 2014. Recent advances in theory, methods, and practice of operations research ISBN (Editors: R.Z. Ríos-Mercado,  J.-F. Camacho-Vallejo, J.L González-Velarde, M. Laguna). pp. 343-350.
  17. J.E. Mendoza, L-M. Rousseau, J. G. Villegas. A hybrid metaheuristic to solve the vehicle routing problem with stochastic demand and probabilistic duration constraints. 8th Triennial Symposium on Transportation Analysis (TRISTAN 2013). San Pedro de Atacama (Chile) – June 9th–14th, 2013
  18. J. A. Montoya, M. Vélez-Gallego, J.G. Villegas. Capacitated facility location problem with general operating and building costs. Congreso Latino-Iberoamericano de Investigacion Operativa/ Simposio Brasileiro de Pesquisa Operacional (XVI CLAIO/XLIV SBPO). Rio de Janeiro – Brazil, September, 24-28 2012. [pdf]
  19. J.G. Villegas, C. Castañeda P., K.A. Blandón. Mejoramiento de la localización de ambulancias de atención pre-hospitalaria en Medellín (Colombia) con modelos de optimización. Congreso Latino-Iberoamericano de Investigacion Operativa/ Simposio Brasileiro de Pesquisa Operacional (XVI CLAIO/XLIV SBPO). Rio de Janeiro – Brazil, September, 24-28 2012. [pdf]
  20. J.E. Mendoza, J.G. Villegas. A GRASP with heuristic concentration for the vehicle routing problem with stochastic demands. 13 congrès annuel de la Société française de Recherche Opérationnelle et d’Aide à la Décision (ROADEF 2012). Angers, France. 2012.
  21. V. P. Nguyen, C. Prins, C. Prodhon and J. G. Villegas. A branch-and-cut algorithm for the two-echelon location-routing problem. 5th International Workshop on Freight Transportation and Logistics ODYSSEUS 2012, Mykonos, Greece, May 21-25, 2012.
  22. J. M. Belenguer, A. Martinez, C. Prins, C. Prodhon, J.G. Villegas and E. Benavent. A branch-and-cut algorithm for the single truck and trailer routing problem with satellite depots. 5th International Workshop on Freight Transportation and Logistics ODYSSEUS 2012, Mykonos, Greece, May 21-25, 2012.
  23. J.E. Mendoza, J.G. Villegas. A space biased-sampling approach for the vehicle routing problem with stochastic demands. The IX Metaheuristics International Conference- MIC2011. Udine (Italy), July 25–28, 2011.
  24. J.G. Villegas, C. Prins, C. Prodhon, A.L. Medaglia, and N. Velasco. Heuristic column generation for the truck and trailer routing problem. International Conference on Industrial Engineering and Systems Management IESM’2011. Metz (France). May 25-2, 2011 [pdf]
  25. J.G. Villegas, C. Prins, C. Prodhon, A.L. Medaglia, and N. Velasco. GRASP/VND  with path relinking for the truck and trailer routing problem. TRISTAN VII: Seventh Triennial Symposium on Transportation Analysis, Tromsø (Norway), June 20-25, 2010. [pdf]
  26. J.G. Villegas, A.L. Medaglia, C. Prins, C. Prodhon, and N. Velasco. GRASP/evolutionary local search hybrids for a truck and trailer routing problem. MIC 2009: The VIII Metaheuristics International Conference, Hamburg (Germany), July 13-16, 2009.[pdf]
  27. J.G. Villegas, A.L. Medaglia, J.E. Mendoza, C. Prins, C. Prodhon, and N. Velasco. A split-based framework for the vehicle routing problem. CLAIO 2008: XIV Congreso Latino Ibero Americano de Investigación de Operaciones, Cartagena (Colombia), May 17-21, 2008.
  28. E.V. Gutierrez, J.D. Palacios and  J.G. Villegas. Reseña del Software Disponible en Colombia para el Diseño de Rutas de Distribución y Servicios. CLAIO 2008: XIV Congreso Latino Ibero Americano de Investigación de Operaciones, Cartagena (Colombia), Sept. 9-12, 2008.
  29. J.E Mendoza, C. Gueret, A.L Medaglia, N. Velasco and J.G. Villegas. JCW: an object-oriented framework for the rapid development of vehicle routing heuristics based on savings.  CLAIO 2008: XIV Congreso Latino Ibero Americano de Investigación de Operaciones, Cartagena (Colombia), Sept. 9-12, 2008.
  30. A.L. Medaglia, J.G. Villegas, and D.M. Rodríguez-Coca. Hybrid Bi-objective Evolutionary Algorithms for the Design of a Hospital Waste Management Network  CLAIO 2006, XIII Congreso Latino Ibero Americano de Investigación de Operaciones. Montevideo (Uruguay), November 27-30, 2006.