Christof Defryn

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PhD researcher
Room: B.512
Tel: +32 32654205
Email: christof.defryn@uantwerpen.be


Horizontal collaboration in logistics - Algorithms for operational and tactical decision support in multi-partner VRPs

List of publications

  • C. Defryn and K. Sörensen, "A fast two-level variable neighborhood search for the clustered vehicle routing problem," Computers & operations research, vol. 83, pp. 78-94, 2017.
    [PDF] [DOI] [Bibtex]
    @article{defryn2017fast,
    title = {A fast two-level variable neighborhood search for the clustered vehicle routing problem},
    author = {Defryn, Christof and Sörensen, Kenneth},
    journal = {Computers \& Operations Research},
    volume = {83},
    pages = {78--94},
    year = {2017},
    doi = {10.1016/j.cor.2017.02.007},
    keywords = {vehicle routing problem},
    }
  • C. Defryn, C. Vanovermeire, and K. Sörensen, "Gain sharing in horizontal logistic co-operation: a case study in the fresh fruit and vegetables sector," in Sustainable logistics and supply chains, M. Lu and J. De Bock, Eds., Springer International Publishing, 2015, pp. 75-89.
    [PDF] [DOI] [Bibtex]
    @incollection{defryn2015gain,
    title = {Gain Sharing in Horizontal Logistic Co-operation: A Case Study in the Fresh Fruit and Vegetables Sector},
    author = {Defryn, Christof and Vanovermeire, Christine and Sörensen, Kenneth},
    booktitle = {Sustainable Logistics and Supply Chains},
    pages = {75-89},
    series = {Contributions to Management Science},
    editor = {Lu, Meng and De Bock, Joost},
    publisher = {Springer International Publishing},
    year = {2015},
    doi = {10.1007/978-3-319-17419-8_4},
    keywords = {horizontal collaboration},
    }
  • C. Defryn, K. Sörensen, and T. Cornelissens, "The selective vehicle routing problem in a collaborative environment," European journal of operational research, vol. 250, iss. 2, pp. 400-411, 2016.
    [PDF] [DOI] [Bibtex]
    @article{defryn2016selective,
    title = {The selective vehicle routing problem in a collaborative environment},
    author = {Defryn, Christof and Sörensen, Kenneth and Cornelissens, Trijntje},
    journal = {European Journal of Operational Research},
    volume = {250},
    number = {2},
    pages = {400--411},
    year = {2016},
    publisher = {Elsevier},
    doi = {10.1016/j.ejor.2015.09.059},
    keywords = {horizontal collaboration, vehicle routing problem},
    }

List of presentations

  • C. Defryn, K. Sörensen, and W. Dullaert, "Horizontal logistic cooperations - integration of individual partner objectives in multi-partner logistic optimisation models," in ORBEL31: 31st annual conference of the belgian operations research society, Brussels, Belgium, 2017.
    [PDF] [Bibtex]
    @inproceedings{defryn2017integration_pres,
    author = {Defryn, Christof and Sörensen, Kenneth and Dullaert, Wout},
    title = {Horizontal logistic cooperations - Integration of individual partner objectives in multi-partner logistic optimisation models},
    booktitle = {{ORBEL31}: 31st Annual Conference of the Belgian Operations Research Society},
    year = {2017},
    address = {Brussels, Belgium},
    keywords = {vehicle routing problem},
    }
  • C. Defryn and K. Sörensen, "Horizontal co-operation in a clustered distribution environment. exchanging zones for increased efficiency," in VEROLOG2016: annual workshop of the euro working group on vehicle routing and logistics optimization, Nantes, France, 2016.
    [PDF] [Bibtex]
    @inproceedings{defryn2016horizontalb_pres,
    author = {Defryn, Christof and S\"{o}rensen, Kenneth},
    title = {Horizontal co-operation in a clustered distribution environment. Exchanging zones for increased efficiency},
    booktitle = {{VEROLOG2016}: Annual workshop of the EURO working group on Vehicle Routing and Logistics optimization},
    year = {2016},
    address = {Nantes, France},
    keywords = {horizontal collaboration, vehicle routing problem},
    }
  • C. Defryn and K. Sörensen, "Horizontal co-operation in a clustered distribution environment: exchanging zones for increased efficiency," in ORBEL30: 30th annual conference of the belgian operations research society, Louvain la neuve, Belgium, 2016.
    [PDF] [Bibtex]
    @inproceedings{defryn2016horizontal_pres,
    author = {Defryn, Christof and Sörensen, Kenneth},
    title = {Horizontal co-operation in a clustered distribution environment: exchanging zones for increased efficiency},
    booktitle = {{ORBEL30}: 30th Annual Conference of the Belgian Operations Research Society},
    year = {2016},
    address = {Louvain la neuve, Belgium},
    keywords = {horizontal collaboration, vehicle routing problem},
    }
  • C. Defryn and K. Sörensen, "A multi-objective collaborative approach for the travelling salesman problem with time windows," in EURO2015: european conference on operational research, Glasgow, UK, 2015.
    [Bibtex]
    @inproceedings{defryn2015multiobjective_pres,
    author = {Defryn, Christof and Sörensen, Kenneth},
    title = {A multi-objective collaborative approach for the Travelling Salesman Problem with Time Windows},
    booktitle = {{EURO2015}: European Conference on Operational Research},
    year = {2015},
    address = {Glasgow, UK},
    keywords = {horizontal collaboration, vehicle routing problem},
    }
  • C. Defryn and K. Sörensen, "A multi-objective collaborative approach for the vehicle routing problem with time windows," in VeRoLoG2015: euro working group on vehicle routing and logistics optimization, Vienna, Austria, 2015.
    [Bibtex]
    @inproceedings{defryn2015multiobjectiveb_pres,
    author = {Defryn, Christof and Sörensen, Kenneth},
    title = {A multi-objective collaborative approach for the Vehicle Routing Problem with Time Windows},
    booktitle = {{VeRoLoG2015}: EURO Working Group on Vehicle Routing and Logistics Optimization},
    year = {2015},
    address = {Vienna, Austria},
    keywords = {horizontal collaboration, vehicle routing problem},
    }
  • C. Defryn, K. Sörensen, and T. Cornelissens, "The selective vehicle routing problem in a collaborative environment," in ALIO-EURO conference, Montevideo, Uruguay, 2014.
    [Bibtex]
    @inproceedings{defryn2014selected_pres,
    author = {Defryn, Christof and Sörensen, Kenneth and Cornelissens, Trijntje},
    title = {The Selective Vehicle Routing Problem in a collaborative environment},
    booktitle = {{ALIO-EURO} conference},
    year = {2014},
    address = {Montevideo, Uruguay},
    keywords = {horizontal collaboration, vehicle routing problem},
    }
  • C. Defryn and K. Sörensen, "The clustered vehicle routing problem: a two-level variable neighbourhood search," in EURO/IFORS conference, Barcelona, Spain, 2014.
    [PDF] [Bibtex]
    @inproceedings{defryn2014clustered_pres,
    author = {Defryn, Christof and Sörensen, Kenneth},
    title = {The clustered vehicle routing problem: a two-level variable neighbourhood search},
    booktitle = {{EURO/IFORS} conference},
    year = {2014},
    address = {Barcelona, Spain},
    keywords = {horizontal collaboration, vehicle routing problem},
    }
  • C. Defryn and K. Sörensen, "The clustered vehicle routing problem: a variable neighbourhood metaheuristic," in 15th EU/ME workshop, Istanbul, Turkey, 2014.
    [Bibtex]
    @inproceedings{defryn2014clusteredb_pres,
    author = {Defryn, Christof and Sörensen, Kenneth},
    title = {The clustered vehicle routing problem: a variable neighbourhood metaheuristic},
    booktitle = {15th {EU/ME} workshop},
    year = {2014},
    address = {Istanbul, Turkey},
    keywords = {vehicle routing problem},
    }
  • C. Defryn and K. Sörensen, "The collaborative selective vehicle routing problem: vehicle routing in a collaborative environment," in ORBEL28: 28th annual conference of the belgian operations research society, Mons, Belgium, 2014.
    [PDF] [Bibtex]
    @inproceedings{defryn2014collaborative_pres,
    author = {Defryn, Christof and Sörensen, Kenneth},
    title = {The collaborative selective vehicle routing problem: vehicle routing in a collaborative environment},
    booktitle = {{ORBEL28}: 28th Annual Conference of the Belgian Operations Research Society},
    year = {2014},
    address = {Mons, Belgium},
    keywords = {horizontal collaboration, vehicle routing problem},
    }
  • C. Defryn and K. Sörensen, "The collaborative team orienteering problem (poster)," in VRP2013: european spring school on vehicle routing, Angers, France, 2013.
    [PDF] [Bibtex]
    @inproceedings{defryn2013collaborative_pres,
    author = {Defryn, Christof and Sörensen, Kenneth},
    title = {The collaborative team orienteering problem (poster)},
    booktitle = {{VRP2013:} European spring school on vehicle routing},
    year = {2013},
    address = {Angers, France},
    keywords = {horizontal collaboration, vehicle routing problem},
    }
  • C. Defryn, C. Vanovermeire, and K. Sörensen, "The effect of customer characteristics on coalition gains in collaborative vehicle routing," in ORBEL27: 27th annual conference of the belgian operations research society, Kortrijk, Belgium, 2013.
    [PDF] [Bibtex]
    @inproceedings{defryn2013effect_pres,
    author = {Defryn, Christof and Vanovermeire, Christine and Sörensen, Kenneth},
    title = {The effect of customer characteristics on coalition gains in collaborative vehicle routing},
    booktitle = {{ORBEL27}: 27th Annual Conference of the Belgian Operations Research Society},
    year = {2013},
    address = {Kortrijk, Belgium},
    keywords = {horizontal collaboration, vehicle routing problem},
    }