PUBLICATIONS

JOURNAL PAPERS

  1. 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]
  2. S. Roman, A.M. Villegas, and J.G. Villegas. An evolutionary strategy for multiobjective reinsurance optimization. Journal of the Operational Research Society. 2017. DOI: 10.1057/s41274-017-0210-y
  3. 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].
  4. 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.
  5. 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]
  6. 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.[see at publisher]
  7. 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]
  8. 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.  [see at publisher]
  9. 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].
  10. 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]
  11. 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]
  12. 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]
  13. 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]
  14. 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]
  15.  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.  [see at publisher]
  16. 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.  [see at publisher]

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]

BOOK CHAPTERS

  1. 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.

WORKING PAPERS

  1. J.E.Muriel, C.E. Patiño and J.G. Villegas.  Evaluating supply chain resilience under road network disruptions: methodology and case study. Working paper. 2015

       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]

      NATIONAL PUBLICATIONS

  1. 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]
  2. 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]
  3. 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]
  4. 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]
  5. 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.

      TECHNICAL REPORTS

  1. M.I. Restrepo & J.G. Villegas. Análisis Envolvente de Datos: Introducción y herramienta pública para su utilización. Departamento de Ingenieria 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]

CONFERENCE PROCEEDINGS

  1. 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]
  2. 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]
  3. 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
  4. 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.
  5. 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
  6. 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]
  7. 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]
  8. 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.
  9. 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.
  10. 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.
  11. 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.
  12. 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]
  13. 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]
  14. 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]
  15. 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.
  16. 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.
  17. 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.
  18. 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.

CONFERENCE TALKS

  1. J.G. Villegas, A.F. Perez P, J.M. López-Lezama. Búsqueda dispersa para la optimización de un sistema de generación distribuida. CLAIO 2016- XVIII Congreso Latino-Iberoamericano de Investigación Operativa, Santigo de Chile. October 2 – 6, 2016.
  2. C.Castañeda, P. Maya., J.G. Villegas. Simulation/Optimization framework for
    multiobjective evaluation of ambulance location in emergency medical systems. CLAIO 2016- XVIII Congreso Latino-Iberoamericano de Investigación Operativa, Santigo de Chile. October 2 – 6, 2016.
  3. J.E. Mendoza, C. Guéret, J.A. Montoya, J.G. Villegas. A comparative study of charging assumptions in electric vehicle routing problems. (EURO 2016) 23th European conference on operational research. Poznan (Poland). July 3-6, 2016.
  4. J.A. Montoya, C. Guéret, J.E. Mendoza, J.G. Villegas. The technician routing problem with conventional and electric vehicles. VeRoLog 2016- Fifth meeting of the EURO working group on vehicle routing and logistics optimization. Nantes (France). June 6-8, 2016.
  5. J.G. Villegas.  Discrete Facility Location. An Overview of applications. ELAVIO 2016- XX  Escuela Latinoamericana de Verano en Investigación Operativa. Cali (Colombia), May 9-13, 2016.
  6. J.A. Montoya, C. Guéret, J.E. Mendoza, J.G. Villegas. A comparative study of charging assumptions in electric vehicle routing problems. (ROADEF 2016) 17 congrès annuel de la Société française de Recherche Opérationnelle et d’Aide à la Décision . Compiègne (France). February 11-12, 2016.
  7. E.A. Alvarez-Tobón, P.A. Velásquez-Restrepo, and J.G. Villegas. Análisis de la capacidad del servicio de cirugía de la IPS Universitaria usando programación entera. II Congreso Internacional de Ingeniería Clínica, Medellin (Colombia) August 20-21, 2015.
  8. J.M. Belenguer, E. Benavent, C. Contardo and J.G. Villegas. A Branch-and-Cut Algorithm for Truck and Trailer Routing Problem. 27th European Conference on Operational Research (EURO 2015). Glasgow, Scotland. July 12-15, 2015.
  9. C. Castañeda P., J.G. Villegas, and Pablo A. Maya. Diseño de un modelo de optimización/simulación para la localización de vehículos en sistemas de emergencia. Congreso Colombiano de Investigación de Operaciones (ASOCIO 2015), Julio 15 y 16, Chía/Cundinamarca (Colombia) ,2015.
  10. S. Roman, A.M. Villegas, and J.G. Villegas. Optimización multiobjetivo de la estructura de reaseguro aplicada a la línea Incendio de Seguros Generales Suramericana S.A. Congreso Colombiano de Investigación de Operaciones (ASOCIO 2015), July 15- 16, Chía/Cundinamarca (Colombia) ,2015.
  11. J.E. Muriel, J.G. Villegas, and C.E. Patiño. Evaluating supply chain resilience under road network disruptions. Congreso Colombiano de Investigación de Operaciones (ASOCIO 2015), July 15- 16, Chía/Cundinamarca (Colombia) ,2015.
  12. A.F. Cañas-Uribe, J.G. Villegas, and J.E. Mendoza. Metaheurísticos híbridos para el problema de ruteo de vehículos con flota propia y subcontratación. Congreso Colombiano de Investigación de Operaciones (ASOCIO 2015), July 15- 16, Chía/Cundinamarca (Colombia) ,2015.
  13. J.G. Villegas. Multiobjective truck and trailer routing problem: hybrid heuristic and computational results. XVII Joint ALIO/SMIO Conference on Operations Research  (CLAIO 2014). Monterrey (Mexico) – October 6th-10th, 2014.
  14. J.E. Muriel, J.G. Villegas and C.E. Patiño. Supply Chain Design Subject to Network Disruptions. 20th Conference of the International Federation of Operational Research Societies (IFORS 2014).  Barcelona, Spain, 13-18 July, 2014
  15. J. E. Mendoza, L.-M. Rousseau and Juan G. Villegas. A hybrid metaheuristic to solve the vehicle routing problem with stochastic demand and probabilistic duration constraints. 3rd INFORMS Transportation Science and Logistics Society Workshop (TSLWS 2014).  Chicago,  June 30th – July 2, 2014.
  16. J.A. Montoya, C. Guéret, J.E. Mendoza and J.G. Villegas.  A simple hybrid heuristic for the Green Vehicle Routing Problem. 3rd meeting of the EURO Working Group on Vehicle Routing and Logistics Optimization (VEROLOG 2014). Oslo, Norway, 22-25 June, 2014
  17. J.A. Montoya, C. Guéret, J.E. Mendoza and J.G. Villegas. A route-first cluster-second heuristic for the green vehicle routing problem. 5me congrès annuel de la Société française de Recherche Opérationnelle et d’Aide à la Décision (ROADEF 2014). Bordeaux, France. Février 26-28, 2014.
  18. J.G. Villegas, C. Castañeda and K. Blandón. Modelos de localización para el mejoramiento de la atención prehospitalaria de accidentes de tránsito en Medellín (Colombia). 1era Asamblea de la Red de Universidades para la Seguridad Vial. Buenos Aires, Argentina, Noviembre 18-19, 2013.
  19. J.G. Villegas. Discrete Facility Location:  An overview.  ELAVIO 2014- XVIII Escuela Latinoamericana de Verano en Investigación Operativa. Areia. Brazil, February 17-21, 2014.
  20. J.G. Villegas. Localización de instalaciones: Aplicaciones en el sector público y Privado. I Encuentro de Ingeniería Industrial – Universidad del Valle – Sede Palmira – Octubre 16-18 de 2013
  21. L.-M. Rousseau, J.E. Mendoza and J.G. Villegas. On the vehicle routing problem with stochastic demands and duration constraints. 55th Canadian Operational Research Society – Annual Conference (CORS 2013). Vancouver – BC (Canada) – May 27-29, 2013
  22. J.E. Mendoza and J.G. Villegas. A GRASP with heuristic concentration for the vehicle routing problem with stochastic demands. 25th European Conference on Operational Research (EURO 2012). Vilnius, Lithuania. July 2012.
  23. J.E. Mendoza and J.G. Villegas. A multi-space sampling heuristic for the vehicle routing problem with stochastic demands. 9th International conference on integration of constraint programing, artificial intelligence, and operations research (CPAIOR 2012). Nantes, France. May 28-June 1,  2012.
  24. C. Castañeda, J.G. Villegas and K. Blandón. Propuesta de localización de ambulancias para atención pre-hospitalaria en la ciudad de Medellín. IX Congreso Latinoamericano Instituto de Ingenieros Industriales. Bogotá (Colombia) May 15-17, 2012
  25. J.G. Villegas, C. Prins, C. Prodhon, A.L. Medaglia, and N. Velasco. A matheuristic for the truck and trailer routing problem. Route 2011. Sitges (Spain) May 31-June 3, 2011
  26. J. M. Belenguer, E. Benavent, C. Prins, C. Prodhon, and J.G. Villegas. A branch-and-cut algorithm for the single truck and trailer routing problem with satellite depots  XXXII Congreso Nacional de Estadística e Investigación Operativa (SEIO 2010), A Coruña (Spain), September 14-17, 2010.
  27. J.G. Villegas, J. M. Belenguer, E. Benavent, C. Prins, and C. Prodhon. A cutting plane approach for the single truck and trailer routing problem with satellite  depots. In EURO 2010: XXIV European Conference on Operational Research, Lisbon (Portugal), July 11-14, 2010.
  28. J. G. Villegas, A. L. Medaglia, C. Prins, C. Prodhon, and N. Velasco. Solving the truck and trailer routing problem with a route-first, cluster-second framework. In ALIO/INFORMS Joint International Meeting, Buenos Aires (Argentina), June 6-9, 2010.
  29. J.G. Villegas, C. Prins, C. Prodhon, A.L. Medaglia and N. Velasco. Metaheuristics for a truck and trailer routing problem. In CORAL 2009: III Combinatorial Optimization, Routing and Location Meeting, Elche (Spain), June 10-12, 2009.
  30. J.G. Villegas, C. Prins, C. Prodhon, A.L. Medaglia and N. Velasco, Vehicle routing with trailers. 4ème Forum des doctorants de l’UTT. Troyes (France), May 13, 2009.
  31. C. Ruiz, D.A. Chavarro,, J.G. Villegas, R. Bonilla, R. Zarama, J.L. Villaveces, L. A. Orozco. A Productivity-oriented model for ranking research groups using data envelopment analysis. INFORMS Annual Meeting 2008, Washington D.C. (USA), October 12-15, 2008.
  32. J. G. Villegas, N. Velasco, C. Prins, J. E. Mendoza, and A. L. Medaglia. A split-based evolutionary framework for vehicle routing. Industrial Engineering Research Conference (IERC 2008), Vancouver (Canada), May 17-21, 2008.
  33. C.A. Amaya, A.L. Medaglia, J.E. Mendoza, N. Velasco, J.G Villegas. Avances en problemas de ruteo. V Congreso latinoamericano del Institute of Industrial Engineers, Paipa (Colombia), March 28-29,  2008.
  34. M.I. Restrepo and J.G. Villegas. Clasificación de Grupos de investigación con análisis envolvente de datos. IV Congreso latinoamericano del Institute of Industrial Engineers, Bogota (Colombia),  March 30-31, 2007.
  35. D.M. Rodríguez-Coca, A.L.  Medaglia and J.G. Villegas. Design of a hospital waste management network in the Department of Boyacà (Colombia). INFORMS Annual Meeting 2005, San Francisco (USA) November 12-15, 2005.
  36. J.G. Villegas. Algoritmos Evolutivos para la solución de problemas de localización multi-objetivo sin restricciones de capacidad. XI Escuela Lationamericana de Verano en Investigación de Operaciones, Villa de Leyva, (Colombia), 2005.
  37. J. G. Villegas, F. Palacios and A.L. Medaglia. Unveiling the efficient frontier of a biobjective (cost-coverage) unconstrained location problem. CORS/INFORMS Joint International Meeting, Banff (Canadá), May 16-19 , 2004.
  38. E. Gutiérrez, A.L. Medaglia, F. Palacios and J.G. Villegas.  Un enfoque de algoritmos genéticos para un problema de localización de bodegas bi-objetivo con restricciones de capacidad. III Congreso Colombiano – I Conferencia Andina de Investigación de Operaciones (CCIO-2004), Cartagena (Colombia),  March 2004.