• Design and analysis of a truncated elliptical-shaped chipless RFID tag 

  Khan, A. T.; Abdullah, Y.; Farhat, S.; Nawaz, Wasim; Rauf, U. (TÜBİTAK, 2021)

  This article presents a novel polarization-insensitive chipless radio frequency identification tag having an encoding capacity of 11 bits. The proposed resonator design comprises discontinuous arc slots forming truncated ...

• Comprehensive study on UAV-based FSO links for high-speed train backhauling 

  Khallaf, H. S.; Uysal, Murat (The Optical Society, 2021-09-20)

  In this paper, we introduce the idea of using unmanned aerial vehicle (UAV)-based free-space optical communication systems to backhaul high-speed trains. We introduce a composite channel model that includes effects of both ...

• Development of an aerial interface for extraction of the electrodynamic fingerprints of the single-photon detectors 

  Karamzadeh, S.; Durak, Kadir; Jam, Naser Chamani; Rafiei, V.; Awad, B. (Wiley, 2021-12)

  In this study, a novel structure of semi array of antipodal Vivaldi antenna is designed to extract the RF radiations from the single-photon detectors in a quantum key distribution system. The proposed antenna covers a ...

• Effect of photon statistics on vacuum fluctuations based QRNG 

  Dandaşi, Abdulrahman; Özel, Helin; Hasekioglu, O.; Durak, Kadir (IOP Publishing, 2021-06)

  The speed of quantum random number generators (QRNGs) is a major concern for practical applications. In this work, we introduce scattering as a method to enhance the randomness characteristics of the entropy source. This ...

• A cross-layer design for dynamic resource management of VLC networks 

  Demir, Muhammet Selim; Uysal, Murat (IEEE, 2021-03)

  In this article, we propose a cross-layer resource management mechanism for an indoor multiuser visible light communication (VLC) access network. The physical layer builds upon DC-biased orthogonal frequency division ...

• A new LED response model and its application to pre-equalization in VLC systems 

  Kısacık, Rıfat; Yagan, M. Y.; Uysal, Murat; Pusane, A. E.; Yalcinkaya, A. D. (IEEE, 2021-09-01)

  With the growing interest in visible light communication (VLC), it is desired to transmit data at very high rates despite the LED's bandwidth becoming a bottleneck. The bandwidth of a white LED usually ranges between ...

• Visible light communication for connected vehicles: How to achieve the omnidirectional coverage? 

  Eldeeb, Hossıen Badr; Sait, S. M.; Uysal, Murat (IEEE, 2021)

  Visible light communication (VLC) is based on the idea of modulating the light intensity of LEDs to transmit information and enables the dual use of exterior automotive and road side infrastructure lighting for both ...

• Minimizing cogging torque in permanent magnet synchronous generators for small wind turbine applications 

  El Sayed, Ahmad; Ertürk, E. (Gazi University, 2021-06)

  Permanent magnet synchronous generators have a wide usage among electric machines, especially in small wind turbine systems. However permanent magnet synchronous generators suffer from cogging torque due to the magnetic ...

• Battery integrated off-grid DC fast charging: Optimised system design case for California 

  Elibol, B.; Poyrazoğlu, Göktürk; Çalışkan, B. C.; Kaya, H.; Armağan, Ç.; Akınç, H. E.; Kaymaz, A. (IEEE, 2021)

  Global acceptance and exploitation of electric vehicles (EV) is no doubt a fact. There are two major factors beneath this growth; 1. increasing battery capacity thus rising range and 2. availability of DC fast charging ...

• Finite-SNR diversity gain analysis of FSO systems over gamma-gamma fading channels with pointing errors 

  Elamassie, Mohammed; Sait, S. M.; Uysal, Murat (IEEE, 2021-06)

  Free space optical (FSO) communication systems are subject to turbulence-induced fading as a result of fluctuations in the refractive index. Gamma-Gamma (GG) distribution is commonly used in the literature to characterize ...

• Flexible generalized spatial modulation for visible light communications 

  Al-Nahhal, Mohamed; Başar, E.; Uysal, Murat (IEEE, 2021-01)

  Adaptive spatial modulation (ASM) varies the modulation size across the transmit light-emitting diodes (LEDs) to improve the overall spectral efficiency of visible light communication (VLC) systems. This article proposes ...

• Magnitude and wrap-phase OFDM for MIMO visible light communication systems 

  Al-Nahhal, Mohamed; Başar, E.; Uysal, Murat (IEEE, 2021-07)

  Generalized light emitting diode (LED) index modulation (GLIM) has been proposed as an effective multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) scheme for visible light communications ...

• HC-FFT: Highly configurable and efficient FFT implementation on FPGA 

  Ergül, Pakize; Uğurdağ, Hasan Fatih; Davutoğlu, D. (TÜBİTAK, 2021)

  FFT is one of the basic building blocks in many applications such as sensors, radars, communications. For some applications, e.g., real-time spectral monitoring and analysis, FFT needs to be”run-time configurable” so that ...

• Experimental characterization of multi-hop vehicular VLC systems 

  Mohamed, Bassam Aly Abdelrahman; Elamassie, Mohammed; Uysal, Murat (IEEE, 2021)

  In vehicular visible light communication (VLC), the reliable communication distance may be relatively short due to its dependence on many factors including the weather condition. This necessitates the use of relay-assisted ...

• Electrochemical determination of ceftriaxone using polyurethane-modified electrode containing caffeic acid and chitosan 

  Hassinea, Chedia Ben Ali; Güngör, Ö.; Burc, M.; Özcan, İ.; Köytepe, S.; Duran, S. T. (Taylor & Francis, 2022-04-13)

  The aim of this work was to develop an electrochemical sensor based on caffeic acid and chitosan-containing polyurethane (CAC-PU) films modified platinum electrode for ceftriaxone (CFX) determination. For this aim, firstly ...

• Distributed MIMO for Li-Fi: Channel measurements, ray tracing and throughput analysis 

  Eldeeb, Hossien Badr Hossien; Mana, S. M.; Jungnickel, V.; Hellwig, P.; Hilt, J.; Uysal, Murat (IEEE, 2021-08-15)

  LiFi has been considered as a promising candidate for future wireless indoor networks. The IEEE P802.15.13 and P802.11bb standardization groups agreed upon channel models generated using the non-sequential ray tracing ...

• Curriculum learning for face recognition 

  Büyüktaş, Barış; Erdem, Ç. E.; Erdem, Arif Tanju (IEEE, 2021)

  We present a novel curriculum learning (CL) algorithm for face recognition using convolutional neural networks. Curriculum learning is inspired by the fact that humans learn better, when the presented information is organized ...

• Coverage analysis of downlink MU-MIMO cellular networks 

  Arsal, Ali; Civanlar, Mehmet Reha; Uysal, Murat (IEEE, 2021-09)

  In this letter, we analyze the coverage performance of multi-user multiple-input multiple-output (MU-MIMO) downlink cellular networks. We model the locations of the base stations and mobile users using Poisson Point Processes ...

• Determination of price zones during transition from uniform to zonal electricity market: A case study for Turkey 

  Poyrazoğlu, Göktürk (MDPI AG, 2021-02)

  In the electricity market, different pricing models can be applied to increase market competitiveness. Different electricity systems use different market structures. Uniform marginal pricing, zonal marginal pricing, and ...

• A wideband smart EMF detector for mobile devices 

  Tekin, Ahmet (Istanbul University, 2021-01)

  A wideband electromagnetic field (EMF) sensor system is introduced in this study. This small form factor, low-cost system is intended for use with smart mobile devices and can precisely measure the imminent field strength ...

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