Yazar "Pehlivan, Ihsan" seçeneğine göre listele

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    A New Chaotic Mixer Design Based on the Delta Robot and Its Experimental Studies
    (Hindawi Ltd, 2021) Kalayci, Onur; Pehlivan, Ihsan; Akgul, Akif; Coskun, Selcuk; Kurt, Ersin
    In this study, a new chaotic mixer based on the Delta robot was designed and produced which had been controlled with Arduino Uno card and MATLAB. First of all, chaotic mixing systems with different dynamic properties were chosen for the chaotic mixing process. Then, by solving the chaotic systems selected in the MATLAB with the Runge Kutta 45 (RK45) numerical solution algorithm, the results in the integer format were obtained. The obtained chaotic time-series results were transformed into 3-dimensional position information for the servomotors used in the mixer with the algorithm developed in MATLAB. The supervision was provided to ensure that the newly designed chaotic mixer was pacing chaotically in x, y, and z coordinates by transferring the chaotic position information to the Arduino Uno R3 card via USB 2.0. With the software developed in MATLAB, the performances of 7 diversified chaotic systems' trajectories and circular motion trajectories were compared over the numerical simulation orbital distribution ratio (ODR). In the final stage, in a solid-liquid mixture type, at the selected constant mixing time, experimental studies were performed where homogeneity and orbital distribution ratio (ODR) parameters were compared by using 7 diversified chaotic systems. The designed and produced chaotic mixer can also be used in experimental studies of certain liquid-liquid mixture types. It is thought that this prototype presented in the article will serve the aim of developing new chaotic mixer systems and algorithms to derive more homogeneous mixtures in a shorter time.
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    Öğe
    Development of micro computer based mobile random number generator with an encryption application
    (Elsevier, 2021) Akgul, Akif; Gurevin, Bilal; Pehlivan, Ihsan; Yildiz, Muhammed; Kutlu, Mustafa C.; Guleryuz, Emre
    In this study, an equation is derived by changing the parameter values of a chaotic system in the literature and analyzing its chaotic behavior. In the analysis of chaotic behaviors, chaotic system analyses such as phase portraits, sensitivity to initial conditions, Lyapunov exponential spectrum and dimension analysis, bifurcation diagram with Matlab (R) software were investigated. The derived equations were embedded into a mobile random number generator (RNG). RNG was developed on the Raspberry Pi 3 Model B microcomputer. It has been shown that the obtained random numbers can be securely used in encryption applications by successfully passing the statistical tests NIST 800-22, FIPS 140-1 and ENT. An image encryption application with the generated random numbers was implemented on the Raspberry Pi 3 Model B microcomputer. Finally, the encrypted image was subjected to security tests such as histogram analysis, correlation and entropy coefficients, correlation card, NPCR, UACI utilizing MATLAB software. The performance and reliability of the encryption algorithm were also measured. This paper improves the current state of art as it implements chaotic random number generation algorithm in a small footprint micro computer.