Now showing items 178-197 of 320

    • Manipulation of photonic nanojet using liquid crystals for elliptical and circular core-shell variations 

      Eti, N.;  Giden, I.H.;  Hayran, Z.;  Rezaei, B.;  Kurt, Hamza (Taylor And Francis Ltd., 2017-08)
      We present theoretical studies on a tunable photonic nanojet (PNJ) created by adapting a shell and liquid crystal (LC) core architecture. The shell is made of indium tin oxide and the core is infiltrated with nematic LCs. ...
    • Maximal Ratio Combining with Energy Harvesting Multi-Antenna Receivers 

      Uctu, Goksel; Yüksel, Melda (IEEE, 2015-06)
      In this study, we consider a wireless communication system in a point-to-point fading channel with additive white Gaussian noise. The relationship between consumed energy on sampling and decoding processes at the receiver ...
    • Maximizing Wireless Sensor Network lifetime by communication/computation energy optimization of non-repudiation security service: Node level versus network level strategies 

      Yildiz, Huseyin Ugur; Bıçakcı, Kemal; Tavlı, Bülent; Gültekin, Hakan; Incebacak, Davut (Elsevier Science Bv, 2016-02)
      In a typical Wireless Sensor Network (WSN) application, the basic communication service is the transportation of the data collected from sensors to the base station. For prolonging the network lifetime, energy efficiency ...
    • Maximum-Weight Scheduling with Hierarchical Modulation 

      Yalcin, Ahmet Zahid; Yüksel, Melda; Onat, Furuzan Atay; Aktas, Defne; Numanoglu, Tolga; Kolagasioglu, Ahmet Ertugrul (IEEE, 2014)
      In this paper, hierarchical modulation is used in conjunction with maximum-weight scheduling to achieve lower transmission delays. Via hierarchical modulation, the scheduled user has the option to transmit to two users ...
    • Maximum-weight scheduling with hierarchical modulation for lower delay 

      Yalcin, Ahmet Zahid; Yüksel, Melda; Onat, Furuzan Atay; Aktas, Defne; Numanoglu, Tolga; Kolagasioglu, Ahmet Ertugrul (Elsevier Gmbh, Urban & Fischer Verlag, 2016)
      In this paper, hierarchical modulation is used in conjunction with maximum-weight scheduling to achieve lower transmission delays. Via hierarchical modulation, the scheduled user has the option to transmit to two users ...
    • Measurement based threat aware drone base station deployment 

      Akarsu, Alper; Girici, Tolga (Turkiye Klinikleri, 2020-03)
      Unmanned aerial vehicles are gaining importance with many civilian and military applications. Especially the surveillance, search/rescue, and military operations may have to be carried out in extremely constrained environments. ...
    • Metaheuristic approach enabled mode order conversion in photonic crystals: numerical design and experimental realization 

      Bor, Emre; Kurt, Hamza; Turduev, Mirbek (Institute of Physics Publishing, 2019)
      In the presented study, we proposed a design approach based on optimization algorithm to obtain mode order conversion in photonic crystal (PC) structures and experimentally verify the numerical result of the corresponding ...
    • Method of implementing graded index media by symmetry-reduced helical photonic structures 

      Giden, I.H.;  Rezaei, B.;  Kurt, Hamza (OSA - The Optical Society, 2015)
      We propose a new approach for the realization of a graded index (GRIN) medium using a symmetry reduced unit element in photonic crystals. An index gradient on the order of ?n = 0.16 is achieved without modifying the filling ...
    • Mic-in-CMOS: CMUT as a Sealed-Gap Capacitive Microphone 

      Koymen, H.; Ahiska, Y.; Atalar, A.; Köymen, Itır; Tasdelen, A.S.; Yilmaz, M. (IEEE Computer Society, 2020-09)
      The design and production of a CMOS compatible, watertight and ingress-proof CMUT (capacitive micromachined ultrasonic transducer) microphone, mic-in-CMOS, with vacuum-gap is described. We present an analytical model-based ...
    • Mid-infrared T-shaped photonic crystal waveguide for optical refractive index sensing 

      Turduev, Mirbek; Giden, Ibrahim H.; Babayigit, Ceren; Hayran, Zeki; Bor, Emre; Boztug, Cicek; Kurt, Hamza; Staliunas, Kestutis (Elsevier Science Sa, 2017-06)
      In this paper, we propose and design a new type of an integrated optical sensor that performs sensing in a wide wavelength range corresponding to mid-infrared (mid-IR) spectrum. By engineering the structural parameters of ...
    • MIMO nonlinear modeling and robust control of standalone dc photovoltaic systems 

      Deveci, Onur; Kasnakoğlu, Coşku (Pergamon-Elsevier Science Ltd, 2017-07-13)
      Multiple-input multiple-output (MIMO) modeling and simulation techniques are utilized to boost the usefulness of a common DC-output photovoltaic (PV) system. Vast studies in the literature are mostly based on single-input ...
    • Miniature MEMS: Novel Key Components Toward Terahertz Reconfigurability 

      Demir, Kazim; Ünlü, Mehmet (Institute of Electrical and Electronics Engineers Inc., 2020-08)
      We present an overview of the emerging and enabling miniature MEMS-based components for the terahertz frequencies. The usage of miniature MEMS integrated within the terahertz components is an uprising field of research, ...
    • Mode analysis and light confinement of optical rib waveguides in various air slot configurations 

      Eti, N.; Mahariq, I.; Kurt, Hamza (IEEE Computer Society, 2015)
      We present a detailed theoretical study on mode analysis and light confinement properties of rib waveguides in various air slot configurations using dielectric materials. The study starts form rectangular rib waveguide ...
    • Model Analysis of Ridge and Rib Types of Silicon Waveguides With Void Compositions 

      Eti, Neslihan; Kurt, Hamza (IEEE-Inst Electrical Electronics Engineers Inc, 2016-06)
      Detailed numerical study on mode characteristics and light confinement properties of ridge and rib waveguides with vertical, horizontal, and cross types of void configurations is presented. The study starts from the mode ...
    • Modeling and Simulation of Quadrotor UAV Using PID Controller 

      Karahan, M.; Kasnakoğlu, Coşku (Institute of Electrical and Electronics Engineers Inc., 2019-06)
      Recent developments in sensor technology, actuators and energy storage devices provides opportunities for development of micro flying robots. This paper provides information about modeling and control of a Quadrotor. ...
    • Monostatic RCS Analysis for Armed and Unarmed UAV 

      Durlu, Caglayan; Hayvacı, Harun Taha (IEEE, 2017)
      In this paper, the analysis and numerical results of back scattering field of armed and unarmed Unmanned Air Vehicle (UAV) are presented. Simulations using Physical Optics (PO) method in Ansys HFSS software for monostatic ...
    • Moving Object Tracking using Simulated Motion Data 

      Bayindir, Seyma; Kasnakoğlu, Coşku (IEEE, 2017)
      This paper presents the development of missile motion tracking using computer simulation and analyzes the results. In order to investigate the missile motion, simulated data and missile model is implemented in numerical ...
    • Multi-objective particle swarm optimization on ultra-thin silicon solar cells 

      Atalay, Ipek Anil; Gunes, Hasan Alper; Alpkilic, Ahmet Mesut; Kurt, Hamza (SPRINGER INDIA, 2020-12)
      Finding optimized parameters for any photonic device is a challenging problem, because as the search space enlarges the computation time and design complexity increase. For higher performance solar cells, various studies ...
    • Multipath exploitation for knowledge-aided adaptive target detection 

      Kumbul, Utku; Hayvacı, Harun Taha (Institution of Engineering and Technology, 2019)
      The authors consider the problem of multipath exploitation on adaptive radar detection of point-like targets in a multipath environment where a priori information is available. A new approach to exploit multipath returns ...
    • Multipath exploitation radar with adaptive detection in partially homogeneous environments 

      Gulen Yilmaz, Seden Hazal; Taha Hayvacı, Harun (Institution of Engineering and Technology, 2020-10)
      The authors deal with the problem of detecting point-like targets in the presence of diffuse multipath under the assumption of a partially homogeneous Gaussian disturbance by introducing an unknown scaling factor which ...