YÖK Akademik
Permanent URI for this collectionhttps://acikarsiv.thk.edu.tr/handle/123456789/2553
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Publication One Dof Thumb Mechanism and It's Dimensional Optimization(International Journal of Multidisciplinary Studies and Innovative Technologies, 2019-01-01) Yavuz, SametThis paper involves the geometrical representation, kinematic solution and dimensional optimization of a one degree of freedom parallel thumb mechanism. The aim of the designing of this mechanism grasping objects by mimicking of a human thumb. Link length optimization of the mechanism are made around an average human thumb sizes by using Firefly Algorithm which is a nature inspired optimization algorithm.Publication Development of a Restraint System for Rear-Facing Car Seats(Machines, 2023-01-01) Himmetoğlu, Selçuk; Yavuz, SametIn self-driving vehicles, passengers can set their seats in an unconventional seating position, such as rear-facing. Sitting in such an orientation can increase the risk of whiplash in the head-and-neck system in a frontal impact, as frontal crashes usually have higher severities compared with rear-end crashes. This paper shows that a forward-facing front seat optimised for rear-impact protection needs to be redesigned to be used as a rear-facing seat. In the second and main part of this paper, a restraint system for rear-facing car seats is developed, and frontal impact simulations with 64 km/h of delta-V are used to evaluate its performance. The designed seating system comprises two rigid torso plates, a fixed recliner and an energy absorber under the seat pan. Without using the developed restraint system, the 50th percentile male human model is exposed to neck shear forces exceeding 600 N. With the developed restraint system, neck shear forces are less than 350 N in frontal impacts with 64 km/h of delta-V. Apart from whiplash, the risk of head, chest, lower extremity and lower back injuries are also evaluated. The results confirm that the developed restraint system successfully protects the occupant since all assessment criteria values are lower than the injury assessment reference values.Publication Classical Yang-Baxter equation from supergravity(2018-01-01) Bakhmatov, I.; Kelekçi, Özgür; Colgáin, E. Ó; Sheikh-Jabbari, M. M.We promote the open-closed string map, originally formulated by Seiberg & Witten, to a solution generating prescription in generalized supergravity. The approach hinges on a knowledge of an antisymmetric bivector Θ, built from antisymmetric products of Killing vectors, which is specified by the equations of motion. In the cases we study, the equations of motion reproduce the classical Yang-Baxter equation (CYBE) and Θ is the most general r-matrix solution. Our work generalizes Yang-Baxter deformations to non-coset spaces and unlocksgravityas ameanstoclassify r-matrix solutions to the CYBE.Publication Large superconformal near-horizons from M-theory(2016-01-01) Lozano, Y.; Kelekçi, Özgür; Montero, J.; Colgáin, E.Colgâin; Park, M.We report on a classification of supersymmetric solutions to 11D supergravity with SOð2;2Þ × SOð3Þ isometry, which are AdS=CFT dual to 2D CFTs with N ¼ð0;4Þ supersymmetry. We recover the Maldacena, Strominger, Witten near-horizon with small superconformal symmetry and identify a class of AdS3 ×S2 ×S2 ×CY2 geometries with emergent large superconformal symmetry. This exhausts known compact geometries. Compactification of M-theory on CY2 results in a vacuum of 7D supergravity with large superconformal symmetry, providing a candidate near-horizon for an extremal black hole and a potential new setting to address microstates.Publication Otomotiv Endüstrisinde Çok Kriterli Güvenilirlik Yaklaşımları(2019-01-01) C. Tuncer Şakar; Güner, Gürkan GüvenPublication Çok Amaçlı Tedarik Zinciri Optimizasyon Modelleri için Kapsamlı bir Literatür Araştırması(2023-01-01) güven; Güner, Gürkan GüvenPublication Sürdürülebilir Sağlık Yönetimi Optimizasyonu Kapsamlı Bir Literatür Araştırması(2023-01-01) Güner, Gürkan GüvenPublication Düzensiz Operasyon Yönetimi için Entegre Havayolu Çizelgeleme Yaklaşımı Karışık Tam Sayılı Doğrusal Olmayan Programlama ve Tavlama Benzetimi(2024-01-01) S. Erol; Güner, Gürkan GüvenPublication An Optimization Approach for the Flight and Aircraft Preventive Maintenance Scheduling Problem(2020-01-01) D. H. Utku; Güner, Gürkan Güven