Now showing items 1-10 of 10

    • Accommodating new flights into an existing airline flight schedule 

      Şafak, Özge; Atamtürk, A.; Aktürk, M. Selim (Elsevier, 2019)
      We present two novel approaches to alter a flight network for introducing new flights while maximizing airline’s profit. A key feature of the first approach is to adjust the aircraft cruise speed to compensate for the ...
    • An analysis of cyclic scheduling problems in robot centered cells 

      Yıldız, Serdar; Karasan, Oya Ekin; Aktürk, M. Selim (Elsevier, 2012)
      The focus of this study is a robot centered cell consisting of m computer numerical control (CNC) machines producing identical parts. Two pure cycles are singled out and further investigated as prominent cycles in minimizing ...
    • Bounds on risk-averse mixed-integer multi-stage stochastic programming problems with mean-CVaR 

      Mahmutoğulları, Ali İrfan; Çavuş, Özlem; Aktürk, M. Selim (Elsevier B.V., 2018)
      Risk-averse mixed-integer multi-stage stochastic programming forms a class of extremely challenging problems since the problem size grows exponentially with the number of stages, the problem is non-convex due to integrality ...
    • Design of a fully automated robotic spot-welding line 

      Aktürk, M. Selim; Tula, Adnan; Gültekin, H. (Science and Technology Publications, 2011)
      The mixed model assembly line design problem includes allocating operations to the stations in the robotic cell and satisfying the demand and cycle time within a desired interval for each model to be produced. We also ...
    • An exact solution approach for risk-averse mixed-integer multi-stage stochastic programming problems 

      Mahmutoğulları, Ali İrfan; Çavuş, Özlem; Aktürk, M. Selim (Springer, 2019)
      Risk-averse mixed-integer multi-stage stochastic programming problems are challenging, large scale and non-convex optimization problems. In this study, we propose an exact solution algorithm for a type of these problems ...
    • Robust airline scheduling with controllable cruise times and chance constraints 

      Duran, A. S.; Gürel, S.; Aktürk, M. Selim (Institute of Industrial Engineers, 2015)
      Robust airline schedules can be considered as flight schedules that are likely to minimize passenger delay. Airlines usually add an additional time—e.g., schedule padding—to scheduled gate-to-gate flight times to make their ...
    • Scheduling in a three-machine flexible robotic cell 

      Gültekin, Hakan; Aktürk, M. Selim; Karasan, Oya Ekin (IFAC, 2006)
      In this study, a three-machine flexible robotic manufacturing cell in which the CNC machines are used is considered. These machines are highly flexible and are capable of performing several different operations. Each machine ...
    • Stochastic lot sizing problem with nervousness considerations 

      Koca, E.; Yaman, Hande; Aktürk, M. Selim (Elsevier, 2018)
      In this paper, we consider the multistage stochastic lot sizing problem with controllable processing times under nervousness considerations. We assume that the processing times can be reduced in return for extra cost ...
    • Tepe Mobilya' da hücresel üretimle teslimat sürelerinin kısaltılması 

      Bozkurt, C. Halil; Çınar, Yüce; Kayayurt, Bade; Sevinçli, Berna; Tamer, Ş. Okan; Usluoğlu, A. Deniz; Aktürk, M. Selim (TMMOB, 2006)
      Tepe Mobilya Fabrikası'nda döşemeli ürünlerin teslimat sürelerinin azaltılması fabrika ve ürünlerin satışlarını gerçekleştiren Tepe Home için büyük önem taşımaktadır. Bu projede fabrikanın hücresel üretime geçişi için bir ...
    • The value of multi-stage stochastic programming in risk-averse unit commitment under uncertainty 

      Mahmutoğulları, Ali İrfan; Ahmed, S.; Çavuş, Özlem; Aktürk, M. Selim (IEEE, 2019)
      Day-ahead scheduling of electricity generation or unit commitment is an important and challenging optimization problem in power systems. Variability in net load arising from the increasing penetration of renewable technologies ...