Browsing by Author "Aygün, Nazli Karataş"

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Analysis of a Turkey Meat Production Agri-Chain: A Simulation Study
(Springer Science and Business Media Deutschland GmbH, 2024) Nazlı Karatas Aygün; Levent Kandiller; Önder Bulut; Aygün, Nazli Karataş; Kandiller, Levent; Bulut, Önder; N.M. Durakbasa , M.G. Gençyılmaz
Poultry meat will take the greatest share of global meat consumption within ten years because of the ongoing increase. It is anticipated that this upward trend in consumption will result in a rise in the amount of poultry meat produced. Poultry meat agri-chains are composed of various interdependent components including a hatchery many farms and coops and a slaughterhouse generally. The current study tackles the analysis of a real-life agri-chain reaction to changes in hatchery slaughterhouse and farm/coop capacities under different stochastic demand parameters. A discrete-event simulation model is used. The simulation model introduced here is a generic model such that model parameters can be played to reveal different real-life cases. After verifying the model using a toy problem the model is used to observe the impacts of several model parameters on the system-wide performance measures. © 2024 Elsevier B.V. All rights reserved.
Hotel overbooking capacity rationing and cooperation with third-parties: a two-period optimisation model
(Inderscience Publishers, 2024) Nazlı Karatas Aygün; Önder Bulut; Aygün, Nazli Karataş; Bulut, Önder
We propose a two-period optimisation model for a hotel revenue management (RM) problem where overbooking capacity rationing and cooperation with third-party websites are simultaneously considered. In a Stackelberg game structure the hotel first sets the price and overbooking and rationing levels and as the followers third-parties decide their effort levels by a Nash game. The proposed model is solved using a genetic algorithm. An extensive numerical study is performed to investigate the effects of multiple night stays hotel effort level and hotel capacity on the decisions and the hotel profit. It is shown that the value of capacity rationing increases with multiple night stays and the expected profit of the third-parties is decreasing with the hotel effort level but the relation between the hotel effort level and profit is not monotone. As the hotel capacity is expanded the effort level of the third-parties and the hotel profit increase. © 2024 Elsevier B.V. All rights reserved.