@article {1587, title = {A reference set based many-objective co-evolutionary algorithm with an application to the knapsack problem}, journal = {European Journal of Operational Research}, volume = {300}, year = {2022}, pages = {405{\textendash}417}, doi = {10.1016/j.ejor.2021.10.033}, url = {https://doi.org/10.1016/j.ejor.2021.10.033}, author = {H. Mert Sahinkoc and {\"U}mit Bilge} } @article {1586, title = {A robust disaster preparedness model for effective and fair disaster response}, journal = {European Journal of Operational Research}, volume = {280}, year = {2020}, pages = {479{\textendash}494}, doi = {10.1016/j.ejor.2019.07.029}, url = {https://doi.org/10.1016/j.ejor.2019.07.029}, author = {G{\"o}kalp Erbeyo{\u g}lu and {\"U}mit Bilge} } @inbook {1585, title = {Solution of a Real-Life Vehicle Routing Problem with Meal Breaks and Shifts}, booktitle = {Green Transportation and New Advances in Vehicle Routing Problems}, year = {2020}, pages = {131{\textendash}157}, publisher = {Springer International Publishing}, organization = {Springer International Publishing}, doi = {10.1007/978-3-030-45312-1_5}, url = {https://doi.org/10.1007/978-3-030-45312-1_5}, author = {Ci{\u g}dem Karademir and {\"U}mit Bilge and Necati Aras and G{\"o}kay Burak Akku{\c s} and G{\"o}ksu {\"O}znergiz and Onur Do{\u g}an} } @article {1442, title = {Robust supply chain network design with multi-products for a company in the food sector}, journal = {Applied Mathematical Modelling}, volume = {60}, year = {2018}, pages = {526-539}, abstract = {

The paper aims to solve a problem faced by a company competing in the snacks market in Turkey. In line with the growth in this market, the company needs to make important decisions over the next few years about the timing and location of a new plant, its initial capacity, the timing and amount of additional capacity to be installed at the new and existing plants, the assignment of demand points to plants and the amount of raw materials to be shipped from suppliers to the plants in each period. The objective is to minimize the total cost of various components. The problem is formulated as a multi-period supply chain network design model with multi products. The resulting mixed-integer linear programming model is solved by the commercial solver CPLEX. This model enables us to carry out all analyses requested by the company in an efficient way. After this deterministic model is solved on the basis of a 9\% annual increase in demand, it is extended to a minimax regret model to deal with uncertainty in demand quantities. The results suggest that opening the new plant in the city of {\.I}zmir is indeed a robust solution that is unaffected in different scenarios that are based on three distinct demand increase rates. Even though the location of the new plant remains unchanged with respect to scenarios, the optimal robust solution differs from the optimal solution of each scenario in terms of the capacity expansion decisions. After all obtained results had been communicated to the company managers and executives, the new plant construction was started in 2016 very close to the city that the mathematical model had determined. The new plant is expected to start operating in 2018.

}, keywords = {Demand uncertainty, Facility location-allocation, Mixed-integer linear programming, Robust optimization, Supply chain network design}, issn = {0307-904X}, doi = {https://doi.org/10.1016/j.apm.2018.03.034}, url = {https://www.sciencedirect.com/science/article/pii/S0307904X18301586}, author = {Necati Aras and {\"U}mit Bilge} } @article {1165, title = {Multi-dimensional clearing functions for aggregate capacity modelling in multi-stage production systems}, journal = {International Journal of Production Research}, volume = {55}, year = {2017}, pages = {4164{\textendash}4179}, author = {Albey, Erin{\c c} and {\"U}mit Bilge and Uzsoy, Reha} } @article {1169, title = {PSO-based and SA-based metaheuristics for bilinear programming problems: an application to the pooling problem}, journal = {Journal of Heuristics}, volume = {22}, year = {2016}, pages = {147{\textendash}179}, author = {G{\"o}kalp Erbeyo{\u g}lu and {\"U}mit Bilge} } @article {albey2014exploratory, title = {An exploratory study of disaggregated clearing functions for production systems with multiple products}, journal = {International Journal of Production Research}, number = {ahead-of-print}, year = {2014}, pages = {1{\textendash}22}, publisher = {Taylor \& Francis}, author = {Albey, Erin{\c c} and {\"U}mit Bilge and Uzsoy, Reha} } @article {bacsdere2014operational, title = {Operational aircraft maintenance routing problem with remaining time consideration}, journal = {European Journal of Operational Research}, volume = {235}, number = {1}, year = {2014}, pages = {315{\textendash}328}, publisher = {Elsevier}, author = {Ba{\c s}dere, Mehmet and {\"U}mit Bilge} } @article {bilge2013mathematical, title = {Mathematical models for FMS loading and part type selection with flexible process plans}, journal = {European Journal of Industrial Engineering}, year = {2013}, publisher = {Inderscience}, author = {{\"U}mit Bilge and Albey, Erin{\c c} and Be{\c s}ikci, Umut and Erbatur, Kemalettin and Aslan, Ay{\c s}e Nur} } @article {becsikci2013resource, title = {Resource dedication problem in a multi-project environment}, journal = {Flexible Services and Manufacturing Journal}, volume = {25}, number = {1-2}, year = {2013}, pages = {206{\textendash}229}, publisher = {Springer}, author = {Be{\c s}ikci, Umut and {\"U}mit Bilge and Ulusoy, G{\"u}nd{\"u}z} } @article {kocsucuouglu2012material, title = {Material handling considerations in the FMS loading problem with full routing flexibility}, journal = {International Journal of Production Research}, volume = {50}, number = {22}, year = {2012}, pages = {6530{\textendash}6552}, publisher = {Taylor \& Francis}, author = {Ko{\c s}ucuo{\u g}lu, Deniz and {\"U}mit Bilge} } @article {becsikcci2011different, title = {Different resource management policies in multi-mode resource constrained multi-project scheduling}, year = {2011}, publisher = {Institute of Electrical and Electronics Engineers, Inc.}, author = {Be{\c s}ikci, Umut and {\"U}mit Bilge and Ulusoy, G{\"u}nd{\"u}z} } @article {albey2011hierarchical, title = {A hierarchical approach to FMS planning and control with simulation-based capacity anticipation}, journal = {International Journal of Production Research}, volume = {49}, number = {11}, year = {2011}, pages = {3319{\textendash}3342}, publisher = {Taylor \& Francis}, author = {Albey, Erin{\c c} and {\"U}mit Bilge} } @article {bilge2008parametric, title = {A parametric fuzzy logic approach to dynamic part routing under full routing flexibility}, journal = {Computers \& Industrial Engineering}, volume = {55}, number = {1}, year = {2008}, pages = {15{\textendash}33}, publisher = {Elsevier}, author = {{\"U}mit Bilge and F{\i}rat, Murat and Albey, Erin{\c c}} } @article {bilge2007tabu, title = {A tabu search algorithm for the single machine total weighted tardiness problem}, journal = {European Journal of Operational Research}, volume = {176}, number = {3}, year = {2007}, pages = {1423{\textendash}1435}, publisher = {Elsevier}, author = {{\"U}mit Bilge and Kurtulan, M{\"u}jde and K{\i}ra{\c c}, Furkan} } @article {bilge2006multi, title = {Multi-attribute responsive dispatching strategies for automated guided vehicles}, journal = {International Journal of Production Economics}, volume = {100}, number = {1}, year = {2006}, pages = {65{\textendash}75}, publisher = {Elsevier}, author = {{\"U}mit Bilge and Esenduran, G{\"o}k{\c c}e and Varol, Nebibe and {\"O}zt{\"u}rk, Zeynep and Ayd{\i}n, Burcu and Alp, Aysun} } @article {bilge2004tabu, title = {A tabu search algorithm for parallel machine total tardiness problem}, journal = {Computers \& Operations Research}, volume = {31}, number = {3}, year = {2004}, pages = {397{\textendash}414}, publisher = {Elsevier}, author = {{\"U}mit Bilge and K{\i}ra{\c c}, Furkan and Kurtulan, M{\"u}jde and Pekg{\"u}n, Pelin} } @article {bilge1997agv, title = {AGV systems with multi-load carriers: basic issues and potential benefits}, journal = {Journal of manufacturing systems}, volume = {16}, number = {3}, year = {1997}, pages = {159{\textendash}174}, publisher = {Elsevier}, author = {{\"U}mit Bilge and Tanchoco, JMA} } @article {ulusoy1997genetic, title = {A genetic algorithm approach to the simultaneous scheduling of machines and automated guided vehicles}, journal = {Computers \& Operations Research}, volume = {24}, number = {4}, year = {1997}, pages = {335{\textendash}351}, publisher = {Elsevier}, author = {Ulusoy, G{\"u}nd{\"u}z and Sivrikaya-{\c S}erifoǧlu, Funda and {\"U}mit Bilge} } @article {bilge1995time, title = {A time window approach to simultaneous scheduling of machines and material handling system in an FMS}, journal = {Operations Research}, volume = {43}, number = {6}, year = {1995}, pages = {1058{\textendash}1070}, publisher = {INFORMS}, author = {{\"U}mit Bilge and Ulusoy, G{\"u}nd{\"u}z} } @article {ulusoy1993simultaneous, title = {Simultaneous scheduling of machines and automated guided vehicles}, journal = {THE INTERNATIONAL JOURNAL OF PRODUCTION RESEARCH}, volume = {31}, number = {12}, year = {1993}, pages = {2857{\textendash}2873}, publisher = {Taylor \& Francis}, author = {Ulusoy, G and {\"U}mit Bilge} }