GÜVENİLİR HABERLEŞMEDE AÇIK KAPALI KAOTİK ANAHTARLAMA SİSTEMİNİN FPGA KULLANILARAK GERÇEKLEŞTİRİLMESİ

Bu çalışmada, kaotik tabanlı sayısal haberleşme örneği olan Açık Kapalı Kaotik Anahtarlama (AKKA) (Chaotic On Off Keying-COOK) haberleşme sisteminin bilgisayar benzetimeleri ve Alanda Programlanabilir Kapı Dizileri( Field Programming Gate Array-FPGA) kullanılarak uygulaması gerçekleştirilmiştir. Ayrıca çalışmada Hücresel Sinir Ağı (HSA) (Cellular Neural Network –CNN) tabanlı bir kaos üreteci ve Sprott kaos üreteci kullanılarak COOK haberlerleşme sisteminin bit-hata oranı (bit error rate - BER) ve gürültü sinyal oranı (signal to noise ratio - SNR) karşılaştırmalı olarak ortaya konmuştur

Video based wildfire detection at night

There has been an increasing interest in the study of video based fire detection algorithms as video based surveillance systems become widely available for indoor and outdoor monitoring applications. A novel method explicitly developed for video based detection of wildfires at night (in the dark) is presented in this paper. The method comprises four sub-algorithms: (i) slow moving video object detection, (ii) bright region detection, (iii) detection of objects exhibiting periodic motion, and (iv) a sub-algorithm interpreting the motion of moving regions in video. Each of these sub-algorithms characterizes an aspect of fire captured at night by a visible range PTZ camera. Individual decisions of the sub-algorithms are combined together using a least-mean-square (LMS) based decision fusion approach, and fire/nofire decision is reached by an active learning method. © 2009 Elsevier Ltd. All rights reserved

The Effect of Tympanic Membrane Perforation Site, Size and Middle Ear Volume on Hearing Loss

Objective:The aim of this study was to analyze the location and the size of perforation in cases with tympanic membrane perforation, its relation to the manubrium mallei and middle ear volume, and to investigate how these are correlated with the severity and frequencies of conductive hearing loss.Methods: This prospectively designed study included the patients who presented to the the Department of Otorhinolaryngology at the Dokuz Eylül University with hearing loss or tinnitus complaints in the period from June 2014 through June 2017 and were identified to have tympanic membrane perforation in their otoscopic examination. Patients who underwent myringoplasty and type 1 tympanoplasty and whose air-bone gap was found lower than 10 dB in the postoperative audiological examination were included in the study. Effects of the perforation size, the perforation site, and the relationship of the perforation with the manubrium, as well as the effects of the middle ear volume on the severity and frequency of conductive hearing loss were compared.Results: The study included 44 ears of 38 patients (13 male and 25 female) of whom six had tympanic membrane perforation in both ears. Air conduction threshold and air-bone gap were significantly found higher if the perforation area was wide (p<0.05), the perforation involved both the anterior and the posterior quadrants (p<0.05), had contact with the manubrium mallei (p<0.05), and the middle ear volume reduced (p<0.05).Conclusion: Solely tympanic membrane perforation affects hearing function; nevertheless, hearing function are better in cases, which have perforations small in size, no contact with manubrium mallei and well pneumatized middle ears

Comparison of Audiological Findings in Patients with Vestibular Migraine and Migraine

Objective:The aim of this study was to investigate and compare the auditory findings in vestibular migraine (VM) and migraine patients without a history of vertigo.Methods:This study was conducted on 44 patients diagnosed with definite VM and 31 patients diagnosed with migraine who were followed and treated between January 2011 and February 2015. Also, 52 healthy subjects were included in this study as a control group. All participants underwent a detailed otorhinolaryngological examination followed by audiological evaluation, including pure tone audiometry, speech reception threshold, speech recognition score, and acoustic immitancemetry.Results:In the VM group, there were 16 patients (36.4%) with tinnitus, while in the other groups we did not observe any patients with tinnitus. The rate of tinnitus in the VM group was significantly higher in comparison to other groups (p<0.05). None of the groups had any patients with permanent or fluctuating sensorineural hearing loss.Conclusion:We conclude that patients with VM should be closely and longitudinally followed up for the early detection of other otological symptoms and possible occurrence of sensorineural hearing loss in the long term

Lorenz-like system design using cellular neural networks

In this study, a Lorenz-like system based on cellular neural networks (CNNs) is proposed. Complex butterfly chaotic attractors of Lorenz-like systems are constructed using a three-cell CNN. The proposed system makes the CNN imitate quadratic system dynamics without altering its output nonlinearity. Experimental and numerical analysis results are presented in order to verify the convenience of the system

Analysis Methods and FPAA Implementation of Hyperchaotic Systems

In this study, hyperchaotic systems in the literature are investigated and analyzed. At first, systems withdifferent structures are specified. Then, the methods used in the analysis of hyperchaotic systems arestudied. Phase portraits, time series, Lyapunov exponents, bifurcation diagrams, and Poincare maps areanalyzed. Furthermore, chaotic structure of the systems is demonstrated by power spectrum and 0-1tests. After all analysis methods are completed, FPAA implementation is performed, and theimplementation results are given at the end.&nbsp;</p