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  • Effects of turn-milling conditions on chip formation and surface finish 

    Rahimzadeh Berenji, Kaveh; Karagüzel, Umut; Özlü, Emre; Budak, Erhan (Elsevier USA, 2019-04-24)
    Turn-milling operations performed on mill-turn machines offer significant advantages provided that appropriate conditions are used. Compared to conventional machining processes, kinematics and geometry of turn-milling are ...
  • Design of a derotator for the 4 in DAG telescope 

    Baudet, Jeremie; Jolissaint, Laurent; Keskin, Onur; Yeşilyaprak, Cahit; Yerli, Sinan Kaan (SPIE-Int Soc Optical Engineering, 2016)
    This paper Silt our work on the design of a field derotator for the adaptive optics instruments platform of DAG (Dogu Anadolu Cozier vi), a new 4 in telescope for astronomical observations near the city of krzurum, l'urkey. ...
  • Eastern Anatolia Observatory (DAG): Recent developments and a prospective observing site for robotic telescopes 

    Yeşilyaprak, Cahit; Yerli, Sinan Kaan; Keskin, Onur (Universidad Nacional Autonoma Mexico Instituto Astronomia, 2016)
    This document (Eastern Anatolia Observatory (DAG) is the new observatory of Turkey with the optical and near-infrared largest telescope (4 m class) and its robust observing site infrastructure. This national project consists ...
  • Mechanical and thermal modeling of orthogonal turn-milling operation 

    Karagüzel, Umut; Bakkal, Mustafa; Budak, Erhan (Elsevier Science Bv, 2017)
    Turn-milling is a relatively new machining technology which is performed for cutting of symmetrical or non-symmetrical rotational parts. To improve productivity, determination of cutting parameters in turn-milling is ...
  • Extremum seeking control of uncertain systems 

    Dinçmen, Erkin (Turkic World Mathematical Soc, 2017)
    Extremum seeking is used in control problems where the reference trajectory or reference set point of the system is not known but it is searched in real time in order to maximize or minimize a performance function representing ...
  • Frezeyle tornalamada takımda ortaya çıkan termal deformasyonların modellenmesi 

    Karagüzel, Umut; Bakkal, Mustafa; Budak, Erhan (Gazi Univ, Fac Engineering Architecture, 2017)
    It is possible to increase the machined workpiece accuracy and productivity during turn-milling operation by modeling the cutting forces and thermally induced deformations on cutting tool. In order to achieve this task, ...
  • Design of a global extremum seeking algorithm for an omni-directional robot model 

    Dinçmen, Erkin (Romanian Soc Control Tech Informatics, 2017-06)
    A global extremum seeking algorithm is developed for a mobile robot model where the aim is to find the location of the most powerful signal source among the others. In other words, the control problem is to seek the global ...
  • Project management and status update for DAG (Eastern Anatolia Observatory) the 4 meter VIS/IR optical telescope 

    Keskin, Onur; Yeşilyaprak, Cahit; Jolissaint, Laurent (SPIE-Int Soc Optical Engineering,, 2018-01-01)
    The new 4 m Turkish telescope, DAG (East Anatolian Observatory, Fig. 2), will be located on the summit of the mountain Konakli-Karakaya, at an altitude of 3170 m, near the city of Erzurum, Turkey. First light is expected ...
  • Production of M1, M2 and M3 mirrors for DAG project (Belgium, Russia). Current status 

    Abdulkadyrov, Magomed A.; Semenov, Aleksandr P.; Belousov, Sergey P.; Vladimirov, Nikita M.; Ignatov, Aleksandr N.; Patrikeev, Vladimir E.; Pridnya, Vitaliy V.; Polyanchikov, Andrey V.; Nasyrov, Ruslan K.; Pirnay, Olivier; Flebus, Carlo; Yeşilyaprak, Cahit; Keskin, Onur (SPIE-Int Soc Optical Engineering, 2018-01-01)
    This paper describes the technology of production and testing of mirrors for DAG Telescope (Doge Anadolu Gozlemevi) produced by Belgium Company AMOS. JSC LZOS fulfils works on production and testing of three mirrors: primary ...
  • In Flange Derotator Design for the 4m DAG telescope 

    Ünal, Ali Cem; Sarajlic, Mirsad; Jolissaint De Sepibus, Laurent; Keskin, Onur; Yeşilyaprak, Cahit; Baudet, Jeremie (SPIE-Int Soc Optical Engineering, 2018)
    The field rotation effect can be described as observing the gyration of an object with the pupil of the Eastern Anatolian Observatory (DAG) telescope around the optical axis under the influence of the latitude of the ...
  • DAG 4m telescope: Assembly, integration and testing 

    Pirnay, Olivier; Lousberg, Grégory P.; Gabriel, Eric; Marchiori, Gianpietro; Busatta, Andrea; Yeşilyaprak, Cahit; Keskin, Onur (SPIE-Int Soc Optical Engineering, 2018-01-01)
    AMOS with EIE as a main subcontractor, was awarded a contract in November 2014 for the design, manufacturing and installation of a 4m-class telescope for the Turkish Eastern Anatolia Observatory (DAG) situated at 3170 m ...
  • DAG-TGI: Turbulence Generator Instrument for DAG (Eastern Anatolia Observatory) 

    Yeşilyaprak, Cahit; Keskin, Onur; Akbulak, Ümit Bora; Tezcan, Cihan Tuğrul; Güvenir, Furkan; Aydemir, Ömer Faruk (SPIE-Int Soc Optical Engineering, 2018-01-01)
    DAG (East Anatolia Observatory) Telescope has 4 m mirror with active optics (a0) and adaptive optics (AO) systems. In order to evaluate DAG's focal plane instruments and their installation, calibration and laboratory ...
  • A flexible adaptive optics concept for general purpose high angular resolution science on the DAG 4m telescope 

    Jolissaint, Laurent; Bouxin, Audrey; Gökay, Ulaş Sabahattin; Keskin, Onur; Rigaut, Francois; Yeşilyaprak, Cahit (SPIE-Int Soc Optical Engineering, 2018-01-01)
    Thanks to the availability of high actuator density deformable mirrors (ALPAO 468 DM), the high versatility of the pyramid wavefront sensor and above all, the venue of essentially no noise EMCCD detectors, it becomes ...
  • Coordination in building an observatory: A case study of Eastern Anatolian Observatory (DAG) 

    Şahmalı, Ali Erkan; Yeşilyaprak, Cahit; Keskin, Onur (SPIE-Int Soc Optical Engineering, 2018)
    Eastern Anatolian Observatory (DAG) is designed to build on one of the summits of Palandoken Mountains in Erzurum, Turkey, at an altitude of 3,151 meters. The building is under construction since 2015 and expected to be ...
  • Numerical investigation of the effect of radial lip seal geometry on sealing performance 

    Tok, Görkem; Parlar, Zeynep; Temiz, Vedat (IOP Publishing Ltd, 2018)
    Sealing elements are often needed in industry and especially in machine design. With the change and development of machine technology from day to day, sealing elements show continuous development and change in parallel ...
  • An emergency braking controller based on extremum seeking with experimental implementation 

    Dinçmen, Erkin; Altınel, Tunç (Springer Berlin Heidelberg, 2018-03-01)
    An extremum seeking scheme is developed for maximizing the longitudinal tire forces of the road vehicles during emergency braking situations. If the road condition is known, then a conventional braking controller could ...
  • Eastern Anatolia Observatory (DAG): Recent developments 2017 

    Yeşilyaprak, Cahit; Keskin, Onur (SPIE-Int SocOptical Engineering, 2018-01-01)
    East Anatolia Observatory (DAG) is the new observatory of Turkey with the optical (VIS) and near-infrared (NIR) largest telescope (4 m mirror) and its robust observing site infrastructure. This national project consists ...
  • Far-infrared elastic scattering proposal for the Avogadro Project's silicon spheres 

    Humayun, Muhammad Hamza; Khan, Imran; Azeem, Farhan; Chaudhry, Muhammad Rehan; Gökay, Ulaş Sabahattin; Murib, Mohammed Sharif; Serpengüzel, Ali (Pergamon-Elsevier Science Ltd, 2018-05)
    Avogadro constant determines the number of particles in one mole of a substance, thus relating the molar mass of the substance to the mass of this substance. Avogadro constant is related to Systeme Internationale base units ...
  • Extremum seeking dead-zone pre-compensator for an industrial control system 

    Dinçmen, Erkin (Walter De Gruyter GMBH, 2018-06-01)
    PID type industrial controllers such as PI, PD, PID are mature control algorithms and they are intensively used in industry due to their simplicity and easily implementability. However, they start to fail when there is an ...
  • Investigating effects of milling conditions on cutting temperatures through analytical and experimental methods 

    Karagüzel, Umut; Budak, Erhan (Elsevier Science Sa, 2018-12-01)
    Cutting temperatures in milling operations have a significant impact on tool wear, size and shape tolerances and residual stresses of the machined part. Prediction and measurement of cutting temperatures in milling, on the ...

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