Akademik Arşiv / Academic Archive
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Publication An Optimization Approach for a Fresh Food Supply Chain: An Application for the Orange Supply Chain Design in Turkey(2021) Gürkan Güven GÜNER Durdu Hakan UTKU; Güner, Gürkan Güven; Utku, Durdu Hakan; Türk Hava Kurumu Üniversitesi Mühendislik Fakültesi, Endüstri Mühendisliği Bölümü, Ankara Türkiye Türk Hava Kurumu Üniversitesi Mühendislik Fakültesi, Endüstri Mühendisliği Bölümü, Ankara TürkiyeThe optimization of supply chain problems in various industry areas is crucial in terms of controlling the quality of the products and costs during the supply chain processes. Protecting and controlling the quality of the product in the food supply chain processes while minimizing the cost is a difficult and critical problem in the food industry. In this study, an application of a model that integrates the quality of the food in decision-making on distribution and production in a food supply chain is implemented using real-life data in Turkey. The degradation of quality of products in storage or transportation is usually based on the storage temperature, storage time, and other constants such as activation energy. Therefore, prediction for the quality of food products is a complex task because of the dynamics of storage conditions and various product characteristics. A methodological approach is proposed to model the degradation of food quality in this study. The rate of quality degradation of food products is evaluated by the proposed approach. A mixed-integer programming model is developed for the optimization of distribution and production planning. To solve the problem, GAMS (General Algebraic Modeling System) CPLEX solver is used as an optimization tool. The results of the case study shows that the suggested model in this study is implementable to the problem with acceptable solution time. In addition, the suggested model is adaptable for different types of food supply chains. This study aims to develop a methodological approach that can be used as a guide for decision-makers.Publication The hazardous waste location and routing problem: an application in Marmara Region in Turkey(Springer Science and Business Media LLC, 2020-01-30) Durdu Hakan Utku; Serpil Erol; Utku, Durdu HakanPublication A mathematical model on liquefied natural gas supply chain with uncertain demand(Springer Science and Business Media LLC, 2020-08-11) Durdu Hakan Utku; Betül Soyöz; Utku, Durdu HakanPublication Analyzing the Vulnerabilities in a Transshipment Network: A Bilevel Programming Approach(Institute of Electrical and Electronics Engineers (IEEE), 2023) Bayeğ, Selami; Utku, Durdu Hakan; Kasimoğlu, FatihPublication The Evaluation and Improvement of the Production Processes of an Automotive Industry Company via Simulation and Optimization(MDPI AG, 2023-01-27) Durdu Hakan Utku; Utku, Durdu HakanProduction delays are significant problems for the loss of goodwill of the customers and the loss of profits associated with them. The delays may accrue as a result of insufficient resource planning and poorly designed unsatisfactory procedures. In this study, a new mathematical model is proposed to optimize the production processes by minimizing production delays, and a simulation model is developed to test the alternative facility designs. The purpose is to increase customer satisfaction by ensuring that the products are delivered timely and preventing lost sales in an automotive company that manufactures garbage collectors by using real data. The mixed-integer programming problem related to the minimization of production delays is solved by the GAMS CPLEX 24.1.3 software. In this way, the total delay in the production area is minimized by the mathematical model to prevent labor and time loss. Accordingly, the alternative designs are investigated for the improvement of the production processes by using discrete system simulation. A system analysis is performed to determine the bottlenecks in the production processes by developing a simulation model via the ARENA simulation software. With the proposed facility layout alternatives, the delays are eliminated, the total production time is reduced, and an increase in production efficiency is observed.Publication A trapezoidal intuitionistic fuzzy optimization approach for crashing a budget constrained project(Elsevier BV, 2024-04) Fatih Kasimoglu; Selami Bayeg; Adem Pinar; Durdu Hakan Utku; Utku, Durdu Hakan; Utku, Durdu Hakan