Scopus İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/8651
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Article Citation - WoS: 2Citation - Scopus: 2Symmetric and Asymmetric Relationship Between Maritime Transportation and Foreign Trade Volume(inderscience Enterprises Ltd, 2021) Dinc, Dilek Temiz; Karamelikli, HuseyinIn this study, the short and the long-run relationship between maritime transportation and foreign trade volume and also the linear and nonlinear characteristics of this relationship were investigated. Linear relations between maritime transportation and foreign trade volume were analysed by the autoregressive distributed lag (ARDL) model, and nonlinear relations were analysed by the nonlinear autoregressive distributed lag (NARDL) model by using monthly data between 2004 and 2018 in Turkey. According to the results, it was revealed that only the short-run asymmetry and long-run symmetry model was statistically valid and that results should be taken into consideration.Article Citation - WoS: 1Citation - Scopus: 2Dynamic Analysis and Design Optimisation of a Heavy Military Vehicle(inderscience Enterprises Ltd, 2021) Acar, Bulent; Ider, S. Kemal; Cicek, Burak CanThis paper investigates the dynamic response of a heavy military vehicle which is subjected to a dynamic firing load while it is settled on its outriggers. Dynamic behaviour of a settled heavy military vehicle under a dynamic firing load is one of the major design factors of a launching vehicle. Two different finite element (FE) models are created in ANSYS software to obtain the dynamic behaviour of the launching vehicle. The first model is a detailed finite element model (DFEM) and the second model is a simple and less degree of freedom (DOF) parametric FE model which is created with the ANSYS Parametric Design Language (APDL) in order to perform the design optimisation by swiftly varying the parameters such as clamp attachment positions on the chassis, outrigger deployment and outrigger case cross section.Article Citation - WoS: 5Citation - Scopus: 5A Blood Distribution Problem With New Transportation Options - an Application for the Turkish Red Crescent(inderscience Enterprises Ltd, 2019) Azizoglu, Meral; Kurt, Atil; Cetinkaya, Ferda CanThis paper considers the blood distribution problem in the Central Anatolian Regional Blood Centre of the Turkish Red Crescent (TRC) and proposes several demand satisfaction options considering the irradiation centres, urgent demands, and product availability. Our aim is to maximise the total weighted blood demand satisfaction. To address the problem, we develop a mixed integer linear programming model and propose a hybrid genetic algorithm (HGA). The results of our experiments have revealed that the mathematical model cannot handle even small sized problem instances in reasonable times; however, the hybrid genetic algorithm is capable of handling complex daily operations of the Turkish Red Crescent.Article Citation - WoS: 2Citation - Scopus: 2Population Dynamic Caused by War Involvement Via Fractional Derivative on Time Scales(inderscience Enterprises Ltd, 2019) Baleanu, Dumitru; Neamaty, Abdolali; Agheli, Bahram; Nategh, MehdiThis work suggests a model for a population dynamic caused by an enemy attack to a domain of residential areas. With the help of a local non-integer order rate of change and a new structure induced on the real line, we derive a spatial discrete diffusion equation of fractional order. Then making use of the d'Alembert's change of variable we obtain a time scale which is made of union of disjoint compact intervals. These considerations lead us to a non-homogeneous second order nonlinear differential equation. The existence of a positive solution is discussed and through a numerical example the theory is illustrated.Article Citation - WoS: 7Citation - Scopus: 7Solution Approaches To the Blood Distribution Problem of the Turkish Red Crescent(inderscience Enterprises Ltd, 2018) Cetinkaya, Ferda Can; Kurt, Atil; Azizoglu, MeralThis paper considers the blood distribution problem that includes irradiation centres, urgent demands, and product availability in Turkey, Central Anatolian Regional Blood Center of the Turkish Red Crescent. To address the problem, we develop a mixed integer linear program with two objectives: maximising the demand satisfaction and minimising total time travelled by the vehicles. We propose two decomposition-based heuristic solution approaches. The results of our experiments have revealed that the model cannot solve even small sized instances in reasonable times; however, the heuristic solution approaches are appropriate for solving complex real life problems.Article Citation - WoS: 5Citation - Scopus: 8Lp Relaxation-Based Solution Algorithms for the Multi-Mode Project Scheduling With a Non-Renewable Resource(inderscience Enterprises Ltd, 2015) Cetinkaya, Ferda Can; Pamir, Selin Kirbiyik; Azizoglu, MeralIn this study, we consider a multi-mode resource allocation problem with a single non-renewable resource. We assume the resource is released at defined time points and at defined quantities. We also assume that the activity costs are charged once they are completed. Our aim is to minimise the project completion time. We formulate the problem as a pure integer programming model and show that it is strongly NP-hard. We find lower bounds by pure and mixed integer linear programming relaxations of the model and develop three heuristic procedures based on those relaxations. The results of our computational study have revealed the satisfactory performances of our lower bounds and heuristic procedures.Article Citation - WoS: 2Citation - Scopus: 6Controller Area Network With Priority Queues and Fifo Queues: Improved Schedulability Analysis and Message Set Extension(inderscience Enterprises Ltd, 2016) Schmidt, Klaus Werner; Alkan, Burak; Schmidt, Ece Guran; Karani, Duygu Culum; Karakaya, UtkuController area network (CAN) enables communication of electronic control units (ECUs) via messages using priority-based arbitration, which requires the implementation of priority queues (PQs) in the ECU device driver. Nevertheless, it is possible that not all ECUs on a CAN support PQs but use FIFO queues (FQs) instead. In this case, the classical CAN scheduling model with PQs is not suitable for the computation of message worst-case responsetimes (WCRTs) that are essential for verifying the correct vehicle operation. This paper considers an existing scheduling model for CAN with both PQs and FQs. First, an improved algorithm for speeding up the WCRT computation is proposed. Second, the practical case where an existing CAN message set is extended by new messages is addressed. An original algorithm for assigning priorities to new messages while keeping the priority order of existing messages is developed. Both algorithms are evaluated by computational experiments.