Now showing items 255-274 of 320

    • Q-Learning Based Scheduling With Successive Interference Cancellation 

      Mete, Ezgi; Girici, Tolga (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2020-09)
      This work studies the problem of scheduling using Q-learning, which is a reinforcement learning algorithm, in a Successive Interference Cancellation (SIC) - enabled wireless ad hoc network. Distributed Q-learning algorithm ...
    • Rainbow trapping in a chirped three-dimensional photonic crystal 

      Hayran, Zeki; Kurt, Hamza; Staliunas, Kestutis (Nature Publishing Group, 2017-06-08)
      Light localization and intensity enhancement in a woodpile layer-by-layer photonic crystal, whose interlayer distance along the light propagation direction is gradually varied, has been theoretically predicted and ...
    • Rainbow trapping in a tapered photonic crystal waveguide and its application in wavelength demultiplexing effect 

      Neşeli, B.; Bor, E.; Kurt, Hamza; Turduev, M. (OSA - The Optical Society, 2020-05)
      In this paper, we present the numerical and experimental demonstration of a wavelength demultiplexer (WDM) based on the photonic crystal (PC), in which the waveguide has a tapered width. Owing to the tapered waveguide, ...
    • Rate Splitting for Multi-Group Multicasting With a Common Message 

      Yalcin, Ahmet Zahid; Yüksel, Melda; Clerckx, Bruno (Institute of Electrical and Electronics Engineers Inc., 2020-10)
      In this letter, precoding for max-min fairness (MMF) for multi-group multicasting with a common message is studied. The MMF problem is converted into a weighted mean square error minimization problem. A rate-splitting ...
    • Real-Time In Vivo Control of Neural Membrane Potential by Electro-Ionic Modulation 

      Soybaş, Zafer; Şimşek, Sefa; Erol, F. M. Betül; Erdoğan, U. Çiya; Şimşek, Esra N.; Şahin, Büşra; Marçalı, Merve; Aydoğdu, Bahattin; Elbüken, Çağlar; Melik, Rohat (CELL PRESS, 2019)
      Theoretically, by controlling neural membrane potential (Vm) in vivo, motion, sensation, and behavior can be controlled. Until now, there was no available technique that can increase or decrease ion concentration in vivo in real ...
    • Reduced CORDIC Based Logarithmic Convertor 

      Helvacioglu, Gulfem; Korucu, Ali Bugra; Alp, Yasar Kemal; Kasnakoğlu, Coşku (IEEE, 2017)
      In this work, a novel method Reduced CORDIC Based Logarithm Converter (RCBLC) is introduced for computing the specific-based logarithm of the binary values, and then the hardware architecture of RCBLC based on FPGA is ...
    • A reduced symmetric 2D photonic crystal cavity with wavelength tunability 

      Gümüş, Melike A.; Tutgun, Medina; Yılmaz, Döne; Kurt, Hamza (Institute of Physics Publishing, 2019)
      In this paper, we propose a microcavity supported by a designed photonic crystal structure that provides both tunability of cavity modes and the cavity's quality factor. A low symmetric defect region provides a trigger ...
    • Reduced symmetry and analogy to chirality in periodic dielectric media 

      Giden, I.H.;  Turduev, M.;  Kurt, Hamza (Springer, 2014-09)
      Much attention has been paid to photonic applications based on periodic media. Meanwhile, quasi-periodic and disordered mediahave extended the research domain and provided additional novelties for manipulating and controlling ...
    • A Reflectarray Antenna Using Hexagonal Lattice With Enhanced Beam Steering Capability 

      Kiriş, Orçun; Topallı, Kağan; Ünlü, Mehmet ( Institute of Electrical and Electronics Engineers Inc., 2019)
      This paper presents a novel reflectarray antenna with enhanced beam steering capability. The reflectarray antenna is based on the hexagonal distribution of the unit cells on the antenna surface. The hexagonal topology ...
    • Reflection controlling metasurfaces for solar cell applications 

      Yılmaz, Nazmi; Yıldırım, Tolga; Bağcı, Fehim Taha; Kurt, Hamza (SPIE, 2019)
      In this study, we propose a new approach for controlling reflection of light by using highly efficient and polarization insensitive all-dielectric metasurfaces. Moreover, we applied our model on the planar silicon solar cell to ...
    • Resilient Deployment of Drone Base Stations 

      Akarsu, Alper; Girici, Tolga (Institute of Electrical and Electronics Engineers Inc., 2019-06)
      Drone base stations have emerged as a promising solution to the requirements of future cellular networks which may not be fully met by the existing terrestrial base stations. The main reasons for the superiority of DBSs ...
    • Robust Autopilot Design Based on a Disturbance/Uncertainty/Coupling Estimator 

      Kurkcu, Burak; Kasnakoğlu, Coşku (Institute of Electrical and Electronics Engineers Inc., 2019-11)
      Autopilot failures have caused fatal results for both military and civilian applications, leading to loss of life and property. Major contributing factors are disturbances (e.g., winds), uncertainties (e.g., unmodeled ...
    • Robust Temperature Control of a Thermoelectric Cooler via -Synthesis 

      Kürkçü, Burak; Kasnakoğlu, Coşku (Springer New York LLC, 2018)
      In this work robust temperature control of a thermoelectric cooler (TEC) via -synthesis is studied. An uncertain dynamical model for the TEC that is suitable for robust control methods is derived. The model captures ...
    • Robustness of Clustered D2D Cache Placement Against Mobility 

      Kazez, A.C.; Girici, Tolga (Institute of Electrical and Electronics Engineers Inc., 2019-09)
      In this study we consider the problem of cache placement in a device-to-device (D2D) enabled cellular network with mobile users. D2D communication occurs between helper users and ordinary users, where helpers are able ...
    • Role of Unidirectionality and Reverse Path Length on Wireless Sensor Network Lifetime 

      Batmaz, Anil Ufuk; Yildiz, Huseyin Ugur; Tavlı, Bülent (IEEE-Inst Electrical Electronics Engineers Inc, 2014-11)
      Transceiver characteristics, asymmetric interference, and various properties of electromagnetic propagation environment create unidirectional links in wireless sensor networks (WSNs), especially in extreme environments. ...
    • Rotationally tunable polarization-insensitive single and multifocal metasurface 

      Yılmaz, Nazmi; Özdemir, Aytekin; Özer, Ahmet; Kurt, Hamza (Institute of Physics Publishing, 2019-04)
      Metasurfaces with superior capabilities to tailor wave fronts of light have become one of the most widely investigated optical elements. Incorporating tunable features into the metasurface design is required. In this study, ...
    • Rudder Loss Recovery Autopilot System for a Small Fixed-Wing Aircraft 

      Akyurek, Seyma; Gunes, Uygar; Elbir, Ovunc; Kasnakoğlu, Coşku; Kaynak, Unver (IEEE, 2017)
      This paper presents an integrated way of development of an aircraft dynamic modeling including stability and control derivatives and ensuing autopilot design. Stability derivatives are calculated via an automated procedure ...
    • Safety and Effectiveness of Thrombolytic Therapy Compared with Standard Anticoagulation in Subjects with Submassive Pulmonary Embolism 

      Cimen, Pinar; Alizoroglu, Dursun; Ünlü, Mehmet; Kirakli, Cenk; Ediboglu, Ozlem; Erbaycu, Ahmet Emin (2019-06)
      Objective: Thrombolytic and anticoagulation therapy modalities are the possible treatment for submassive pulmonary embolism (PE). However, the indications are still the subject of debate. The aim of the present study was ...
    • Scheduled smooth MIMO robust control of aircraft verified through blade element SIL testing 

      Kasnakoğlu, Coşku (SAGE Publications Ltd, 2018-01-01)
      This paper demonstrates a multi-input multi-output (MIMO) robust control approach where multiple scheduled designs are merged to produce a smooth control law. The design is verified using software-in-the-loop (SIL) testing ...
    • Self-collimation in 2D complex and PT-symmetric media 

      Botey, M.; Turduev, M.; Kurt, Hamza; Herrero, R.; Staliunas, K. (IEEE Computer Society, 2015-08)
      We study propagation light beams in 2D photonic periodic nanostructures with both index and gain/loss modulations. We determine the conditions for complex periodic media with in-phase gain and index modulations to support ...