In this document, first of all, code sections of memristor window functions (Strukov, Joglekar, Biolek and Prodromakis) were created in Pspice package program in detail. Then, the design of the wien bridge oscillator circuit with BJT with a memristor with different window functions was created. Finally, the system's oscillation start time, oscillation band settling time and center oscillation frequency analysis data were imported into the Matlab program and a comprehensive presentation was made. It was seen that the output responses of the wien bridge oscillator circuit realized with the Strukov window function were better than the other window functions. It has also been shown that designs that can be realized with memristor with different window functions in various analog oscillator circuits that can be made in the future can be obtained with this method.
Studies on the control of nonlinear systems with metaheuristic algorithms are increasing day by day. It is one of the nonlinear systems in the Twin rotor multiple input multiple output (TRMS) system, which emerged as a prototype of helicopters. This system has two control angles horizontally and vertically. In this study, the yaw and pitch angle control parameters of the TRMS system were found using both traditional and butterfly-based particle swarm optimization (BFPSO) method. In experimental studies, reference values of main propeller and tail propeller angles were tried to be reached in TRMS with fractional order proportional-integral-derivative (FOPID), proportional-integral-derivative (PID) and tilt-integral-derivative (TID) controllers.
Today, the use of these methods as hybrids has provided the motivation to be a solution to important problems, since the existing methods are insufficient at some points in ensuring the security of personal data. In data security, the inability to decrypt and decrypt the signal to be encrypted retrospectively has always been the subject of research in terms of privacy. At this point, it was preferred to use the electrocardiography (ECG) signal, which is a signal that shows the vital signs of the human body and is also difficult to copy. In the study, firstly, the emulator circuit was obtained by using the mathematical model of the ECG signal. With this obtained signal, the audio signals are masked. The audio signal masked on the transmitter side and the signals providing synchronization were transmitted to the receiver side over a single channel using the frequency division multiplexing (FDM) method. Then, the sliding mode control (SMC) method was chosen for the synchronization of the ECG emulator circuits on the receiver and transmitter side. Histogram, spectral, mean square error (MSE), peak signal to noise ratio (PSNR), key space and key sensitivity, NSCR (number of sample change rate), UACI (unified average changing intensity) and PESQ (perceptual evaluation of speech quality) analyses were used to check the accuracy of the system. These analyses showed that the ECG encoding method has faster unit change, reduces synchronization time, minimizes losses and improves the security of the masked signal compared to other methods sent from two channels. Finally, use of an arrhythmia ECG signal for the synchronization signal on both the transmitter and receiver sides, the synchronization of this signal with the SMC method and the testing of a live audio recording in addition to the conversation, distinguishes the study from other existing studies and reveals its originality.
Data security is very crucial for communication systems. Encryption methods are frequently used to ensure the security. Chaotic oscillators are used for encryption of data because they produce signals that do not repeat themselves. Identical chaotic oscillators should be used and synchronized with each other in order to perform encryption and decryption processes in a healthy way. In this study, the encrypted data and synchronization signal are transmitted to the receiver side using frequency division multiplexing (FDM) method to realize the synchronization between two chaotic oscillators. High-frequency keying is used to increase the encryption quality of the signal to be encrypted on the transmitter side. Proportional-Integral-Derivative (PID) control is used to provide synchronization between two chaotic oscillators. Correlation test, peak signal to noise ratio (PSNR), mean square error (MSE) and spectral entropy were used to determine the accuracy relationship between the original signal and the decryption signal. As a result, the encryption success and reliability of the created system were verified by simulation programs and numerical analysis.
ÖzBu çalışmada ilk olarak Alharbi, Muthuswamy ile Mutlu ve arkadaşları tarafından literatürde önerilen memristör taklit devrelerinin Multisim programında düşük frekanslarda (5Hz-150Hz) benzetimi yapıldı. Taklit devreleri için farklı frekanslarda akım-gerilim (I-V) eğrileri incelenerek en kararlı çıkış eğrisini veren Mutlu ve arkadaşları tarafından önerilen devre gerçekleştirildi. Bu devre kullanılarak 2. dereceden aktif yüksek geçiren filtre devresi tasarlandı. Memristörlü ve direnç kullanılarak gerçekleştirilen filtre devreleri kalite faktörleri, Bode diyagramları ve kesim frekansları açısından karşılaştırıldı. Memristörlü filtre devresinin 0-10 Hz frekans aralığında direnç kullanılarak gerçekleştirilen filtre devresinden daha iyi süzme işlemi yaptığı görüldü.
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