Now showing items 1-20 of 740

    • 2D and 3D shape retrieval using skeleton filling rate 

      Sirin, Yahya; Demirci, Muhammed Fatih (Springer, 2017-03)
      As an increasing number of digital images are generated, a demand for an efficient and effective image retrieval mechanisms grows. In this work, we present a new skeleton-based algorithm for 2D and 3D shape retrieval. The ...
    • 2D lattice material architectures for actuation 

      Nelissen, W. E. D.; Ayas, Can; Tekoğlu, Cihan (Elsevier Ltd, 2019-03)
      The Kagome structure has been shown to be a highly suited micro-architecture for adaptive lattice materials, in which selected lattice members are replaced by actuators aiming to create shape morphing structures. It is the ...
    • 3D Shape Recognition: Enhanced Skeletal Points 

      Sirin, Yahya; Demirci, Muhammed Fatih (IEEE, 2015)
      Digital video production is increasing day after day and the effectiveness and efficiency of the image recognition mechanism has became increasingly important. In this study, a new skeleton-based shape recognition algorithm, ...
    • 3D-printed poly(lactic acid) scaffolds for trabecular bone repair and regeneration: scaffold and native bone characterization 

      Velioglu, Zeynep Busra; Pulat, Deniz; Demirbakan, Beril; Ozcan, Burak; Bayrak, Ece; Erişken, Cevat (Taylor and Francis Ltd, 4.05.2019)
      Purpose: Study objectives were set to (i) fabricate 3D-printed scaffolds/grafts with varying pore sizes, (ii) characterize surface and mechanical properties of scaffolds, (iii) characterize biomechanical properties of ...
    • Abrasive water jet machining of UHMWPE and trade-off optimization 

      Doğankaya, Emre; Kahya, Müge; Ünver, Hakkı Özgür (Taylor and Francis Inc., 2020-06)
      In the defense industry, UHMWPE is primarily used as ballistic material because of its light weight, superior mechanical properties, and particularly, its excellent strength-to-weight ratio compared to metal alloys. In ...
    • Accelerating beam generation via all-dielectric metasurfaces 

      Yılmaz, Nazmi; Bağcı, Fehim Taha; Özer, Ahmet; Kurt, Hamza (SPIE, 2019)
      All-dielectric metasurfaces are unique component to control optical wavefront with high transmission or reflection coefficient. Recently, accelerating beam, which propagates along curved arbitrary trajectories, has been ...
    • Active beam steering and afocal zooming by nematic liquid crystal-infiltrated graded index photonic structures 

      Babayigit, Ceren; Kurt, Hamza; Turduev, Mirbek (Institute of Physics Publishing, 2019)
      This study presents active beam steering and afocal zooming of light by incorporating liquid crystals (LCs) with graded index photonic crystals (GRIN PCs). The GRIN PC structures are composed of low refractive index polymer ...
    • Active Fault Detection in Linear Controller Hardware with Sine Signal 

      Ozkan, M.; Kasnakoğlu, Coşku (Institute of Electrical and Electronics Engineers Inc., 2020-04)
      In this paper, active fault detection is used to detect hardware failure in Linear Controller. Auxiliary test signal is chosen as sine signal. Then frequency and magnitude of sine signal is designed according to bode plot ...
    • Adaptive detection with diffuse multipath exploitation in partially homogeneous environments 

      Hayvacı, Harun Taha; Gülen, Seden Hazal ( Institute of Electrical and Electronics Engineers Inc., 2019)
      In this paper, we deal with the problem of detecting point-like targets in the presence of multipath under the assumption of a partially homogeneous Gaussian disturbance with unknown covariance matrix. Therefore, we introduce ...
    • Adaptive Graded Index Photonic Crystal Lens Design via Nematic Liquid Crystals 

      Giden, Ibrahim Halil; Eti, Neslihan; Rezaei, Behrooz; Kurt, Hamza (IEEE-Inst Electrical Electronics Engineers Inc, 2016-10)
      An adaptive graded index photonic crystal (GRIN PC) lens system is designed by using liquid crystal (LC) infiltration. LCs have the property to change their refractive indices when an external voltage is applied. This ...
    • Adaptive modulation for completion time minimization in wireless broadcast networks 

      Yüksel, Melda; Genc, Yasin (Elsevier Gmbh, Urban & Fischer Verlag, 2017)
      In this work we study the effect of hierarchical modulation on completion time minimization in wireless broadcast channels. Time needed to transmit all bits intended for a particular user is defined as its completion time. ...
    • Additive manufacturing of Kevlar reinforced epoxy composites 

      Nawafleh, Nashat; Chabot, Jordan; Aljaghtam, Mutabe; Oztan, Cagri; Dauer, Edward; Görgülüarslan, Recep Muhammet; Demir, Teyfik; Celik, Emrah (American society of mechanical engineers (ASME), 2020-01)
      Additive manufacturing is defined as layer-by-layer deposition of materials on a surface to fabricate 3D objects with reduction in waste, unlike subtractive manufacturing processes. Short, flexible Kevlar fibers have been ...
    • Aerodynamic Analysis Of A Vertically Landing Lifting Body 

      Aradağ, Selin; Seidel, Jurgen; Cummings, Russell M.; Cook, Layne (Turkish Soc Thermal Sciences Technology, 2015)
      The vertical landing lifting body (VLLB) is a new concept for reusable launch vehicles, which launches vertically, but re-enters the atmosphere at a high angle of attack (alpha) for its entire flight. The VLLB remains at ...
    • Algorithmic financial trading with deep convolutional neural networks: Time series to image conversion approach 

      Sezer, Ömer Berat; Özbayoğlu, Ahmet Murat (Elsevier Ltd, 2018-09)
      Computational intelligence techniques for financial trading systems have always been quite popular. In the last decade, deep learning models start getting more attention, especially within the image processing community. ...
    • All-dielectric metasurface lenses for focal plane arrays operating in mid-wave infrared spectrum 

      Yilmaz, Nazmi; Ozdemir, Aytekin; Bagci, Fehim T.; Takashima, Yuzuru; Kurt, Hamza (SPIE, 2018-08)
      Focal plane arrays (FPAs) as a two-dimensional detector pixel matrix positioned in the focal plane of an optical system have been developed continuously for obtaining higher resolution. On the other hand, for developing ...
    • All-Dielectric Self-Cloaked Structures 

      Hayran, Zeki; Kurt, Hamza; Herrero, Ramon; Botey, Muriel M.; Staliunas, K. (American Chemical Society, 2018-05-16)
      A general procedure to design objects that are intrinsically invisible (without the necessity of an external cloak) has not been demonstrated so far. Here we propose a flexible method to design such self-cloaked objects ...
    • Altitude Control for Small Fixed-Wing Aircraft Using H-infinity Loop-Shaping Method 

      Akyurek, Seyma; Kaynak, Unver; Kasnakoğlu, Coşku (Elsevier Science BV, 2016)
      Autopilot systems for UAVs without human pilots maintain the flight through an appropriate balance of aerodynamic forces autonomously. That is to say, they arc used to make flight missions more reliable and efficient. ...
    • Amyloid-like protein nanofibrous membranes as a sensing layer infrastructure for the design of mass-sensitive biosensors 

      Kabay, Gözde; Kaleli Can, Gizem; Mutlu, Mehmet (Elsevier Advanced Technology, 2017-11)
      Quartz crystal microbalances (QCMs) have been used in the literature for mass sensitive biosensor applications. However, their performance, reliability and stability have been limited by the chemical treatment steps required ...
    • Analysis and prediction in sparse and high dimensional text data: The case of Dow Jones stock market 

      Sert, Onur Can; Sahin, Salih Doruk; Özyer, Tansel; Alhajj, Reda (Elsevier B.V., 2020-05)
      In this research, we proposed a text analysis system to predict stock market movements using news and social media data. It is a scalable prediction system for sparse and high dimensional feature sets. Using the developed ...
    • Analysis Of Convective Heat Transfer Enhancement By Nanofluids: Single-Phase And Two-Phase Treatments 

      Kakaç, Sadık; Pramuanjaroenkij, A. (Springer, 2016-05)
      Nanofluids have been investigated regarding their advantages and potentialities for the purpose of increasing convective heat transfer rates inside thermal systems where they are used as working fluids. Researchers in ...