Yazar "Sahin, Ismail" seçeneğine göre listele

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    Analyzing the performances of evolutionary multi-objective optimizers on design optimization of robot gripper configurations
    (Tubitak Scientific & Technological Research Council Turkey, 2021) Dorterler, Murat; Atila, Umit; Durgut, Rafet; Sahin, Ismail
    Robot grippers are widely used in a variety of areas requiring automation, precision, and safety. The performance of the grippers is directly associated with their design. In this study, four different multiobjective metaheuristic algorithms including particle swarm optimization (MOPSO), artificial algae algorithm (MOAAA), grey wolf optimizer (MOGWO) and nondominated sorting genetic algorithm (NSGA-II) were applied to two different configurations of highly nonlinear and multimodal robot gripper design problem including two objective functions and a certain number of constraints. The first objective is to minimize the difference between minimum and maximum forces for the assumed range in which the gripper ends are displaced. The second objective is force transmission rate that is the ratio of the actuator force to the minimum holding force obtained at the gripper ends. The performance of the optimizers was examined separately for each configuration by using pareto-front curves and hyper-volume (HV) metric. Performances of the optimizers on the specific problem were compared with results of previously proposed algorithms under equal conditions. With respect to these comparisons, the best-known results of the configurations were obtained. Furthermore, the pareto optimal solutions are thoroughly examined to present the relationship between design variables and objective functions.
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    A comprehensive investigation into the performance of optimization methods in spur gear design
    (Taylor & Francis Ltd, 2020) Atila, Umit; Dorteder, Murat; Durgut, Rafet; Sahin, Ismail
    The design of gears with a minimum weight is an optimization problem that has been widely discussed in the literature. Various recent metaheuristic optimization methods, along with the conventional methods, have produced successful results for design optimization problems. In this study, a comprehensive investigation was conducted into the solution of the spur gear design problem in metaheuristic optimization methods. The artificial algae algorithm, artificial bee colony and whale optimization algorithm were applied to the problem for the first time. The grey wolf optimizer and particle swarm optimization were also applied. The results were compared with the performance of the genetic algorithm, simulating annealing and particle swarm optimization, applied in previous studies. A statistical evaluation of these methods applied under the same conditions was carried out in terms of stability. It was shown that the new methods demonstrated significantly improved performance in solving the gear design problem compared to existing methods.
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    Efforts of the British Empire to Build a State in Iraq After the First World War
    (Hale Sivgin, 2014) Sahin, Ismail; Sahin, Cemile; Yuce, Samet
    This study searches for the policies carried out by the British Empire in Mesopotamia where the British invaded during the First World War. However, it will be convenient to know the political, social and economic background of Iraq or Mesopotamia as a general outline to understand the period clearly. Therefore, we have primarily tried to explain the overview of pre-invasion in Iraq. The traditional social structure of the Iraqi population and their relationship with the administration and each other have been questioned in the context of national identity. Then the developments in Iraq after the invasion have been discussed. The strategies which the Britain used to rule Iraq and the public's reaction to this strategy have been investigated. In this context, the facts and the events such as the Mandate, 1920 Arab Revolt, the Cairo Conference of 1921 and the Kingdom of Iraq have been focused. It has been endeavored to perform an analysis to understand the present problems in Iraq by discussing the cause and effect relations of the facts and the events. The research has been prepared by benefiting from a rich bibliography based on the scientific works of the experts for Iraq and the Middle East. As a result, this research has revealed the difficulties in ruling Iraq both internally and externally due to its sui generis political, social and economic conditions and found out that the mistakes made in the nation building process have caused the instability occured at the present time in the country.