Yazar "Yaldiz, Ercan" seçeneğine göre listele

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    ANALYZING MOBILE PHONE ELECTROMAGNETIC RADIATION
    (ST JOHN PATRICK PUBL, 2016) Seyfi, Levent; Yaldiz, Ercan; Nacarolu, Can
    [Abstract not Available]
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    A Different Method Determining Dielectric Constant of Soil and Its FDTD Simulation
    (2003) Yaldiz, Ercan; Bayrak, Mehmet
    In this study, a different method determining the dielectric constant of soil via probes is presented. The method is based on the principle of measuring pulse delay in a given matter. The experimental study, which was carried out basically using an HP8753A vector network analyser, was repeated for various soil mixtures having different values of wetness. The results obtained from the measurements have clearly shown that the dielectric constant of the soil was increasing almost proportionally with that of the moisture content in the soil. The suitability of the measuring method was also checked with a number of simulation results obtained directly using the finite difference time domain method (FDTD).
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    An examination on the effect of CVNN parameters while classifying the real-valued balanced and unbalanced data
    (IEEE, 2018) Acar, Yunus Emre; Ceylan, Murat; Yaldiz, Ercan
    In this study, a Complex-Valued Neural Network is designed to investigate the effects of the mapping angle and the learning rate on both imbalanced and balanced data. Symmetry detection problems with 3 different lengths are handled as the imbalanced data with event rates of 0.25, 0.125 and 0.0675. In order to make the data balanced, the symmetric members of the training set are resampled. The effects of the learning rate and the mapping angle are investigated for 3 different activation functions. The performance of the CVNN is measured using confusion matrix. 4-fold cross validation is used to validate the results. The results show that the CVNN is a strong tool to classify both the real valued imbalanced and balanced data with the right mapping angle and the learning rate that suit the selected activation function.
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    FPGA Based Fast Bartlett DoA Estimator for ULA Antenna Using Parallel Computing
    (APPLIED COMPUTATIONAL ELECTROMAGNETICS SOC, 2018) Unlersen, Fahri M.; Yaldiz, Ercan; Imeci, Sehabeddin T.
    This paper presents a design and implementation of a structure which uses Bartlett Direction of Arrival (DoA) algorithm and a receiver system on Altera Cyclone IV and Cyclone III FPGAs. First of all, a software defined radio (SDR) that has 4 simultaneous inputs, is designed. All data used in this study are obtained by using this radio system. Then one of the FPGA is configured as antenna simulator and the other one is used for implementing Bartlett DoA estimation algorithm. Bartlett DoA estimation algorithm is developed completely in parallel and compared with a previous study which is performed sequentially on an FPGA using NIOS processor. The designs are tested by using 4-element Uniform Linear Array (ULA) antenna. Implemented hardware is compared in terms of DoA calculation speed and the sources that occupy on the FPGA. Furthermore, the paper has significant improvement in calculation duration thereby achieving lower response latency compared with previously published similar works.
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    Implementation of FMCW Radar for Training Applications
    (IEEE, 2017) Basarslan, Oguz; Yaldiz, Ercan
    In this study, a frequency modulated continuous wave (FMCW) radar has been implemented. The FMCW is obtained by modulating CW signal. The triangular wave signal has been selected as modulation signal and a modulator circuit has been performed. The FMCW radar system provides the target velocity and range information in sufficient resolution within a lOO-meter range at a central operating frequency of 2.4 GHz. The range and velocity information of target object is obtained by Matlab program on the computer. In future work, radar RF components will be improved to increase output power and range.
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    A simulator based on an energy-efficient GPR algorithm modified for the scanning of all types of regions
    (TUBITAK SCIENTIFIC & TECHNICAL RESEARCH COUNCIL TURKEY, 2012) Seyfi, Levent; Yaldiz, Ercan
    An improved simulator is presented for the simulation of an energy-efficient ground-penetrating radar (GPR) using the 2D finite-difference time-domain method in the MATLAB environment. This simulator is novel in that it improves on previous work that did not involve scanning a buried object or the intermittent sublayer beneath the ground using an energy-efficient algorithm. The present simulator examines the scanned region and automatically chooses either a common algorithm or an energy-efficient algorithm, depending on the region. The simulator provides the possibility of using an energy-efficient GPR without the need for the operator to determine the suitability of the scanned region. Three different models are defined to confirm the validity of the simulator. These models separately include an inclined sublayer, a rough sublayer, and a buried object. The obtained results show that the energy-efficient GPR can be used in all types of regions.