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Your search keyword '"Pham, Viet-Thanh"' showing total 860 results
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860 results on '"Pham, Viet-Thanh"'

3. Asymmetrical novel hyperchaotic system with two exponential functions and an application to image encryption

Author

Shukur Ali A., AlFallooji Mohanad A., and Pham Viet-Thanh

Subjects
hyperchaotic systems, asymmetrical systems, ultimate bound, sigmoid function, adaptive synchronization, hidden attractor, Engineering (General). Civil engineering (General), TA1-2040
Abstract

In this article, asymmetrical novel system with two exponential functions, which can show hyperchaotic behavior, has been proposed. Although new system possesses only one unstable equilibrium. The dynamical behaviors of such system are discovered by computing the Lyapunov exponents and bifurcation diagram. Furthermore, the synchronization of the proposed system are also presented by an adaptive synchronization approach of two identical hyperchaotic systems. An application to image encryption has been obtained.

Published
2024
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6. Is fractional-order chaos theory the new tool to model chaotic pandemics as Covid-19?

Author

Borah, Manashita, Gayan, Antara, Sharma, Jiv Siddhi, Chen, YangQuan, Wei, Zhouchao, and Pham, Viet-Thanh

Subjects
Engineering, Mathematical Sciences, Chaos, Control, Fractional-order, Pandemic, Plague, Cancer, Covid-19, Acoustics, Mathematical sciences
Abstract

The deadly outbreak of the second wave of Covid-19, especially in worst hit lower-middle-income countries like India, and the drastic rise of another growing epidemic of Mucormycosis, call for an efficient mathematical tool to model pandemics, analyse their course of outbreak and help in adopting quicker control strategies to converge to an infection-free equilibrium. This review paper on prominent pandemics reveals that their dispersion is chaotic in nature having long-range memory effects and features which the existing integer-order models fail to capture. This paper thus puts forward the use of fractional-order (FO) chaos theory that has memory capacity and hereditary properties, as a potential tool to model the pandemics with more accuracy and closeness to their real physical dynamics. We investigate eight FO models of Bombay plague, Cancer and Covid-19 pandemics through phase portraits, time series, Lyapunov exponents and bifurcation analysis. FO controllers (FOCs) on the concepts of fuzzy logic, adaptive sliding mode and active backstepping control are designed to stabilise chaos. Also, FOCs based on adaptive sliding mode and active backstepping synchronisation are designed to synchronise a chaotic epidemic with a non-chaotic one, to mitigate the unpredictability due to chaos during transmission. It is found that severity and complexity of the models increase as the memory fades, indicating that FO can be used as a crucial parameter to analyse the progression of a pandemic. To sum it up, this paper will help researchers to have an overview of using fractional calculus in modelling pandemics more precisely and also to approximate, choose, stabilise and synchronise the chaos control parameter that will eliminate the extreme sensitivity and irregularity of the models.

Published
2022

17. Contributors

Author

Abdelmalek, Salem, primary, Agarwal, Praveen, additional, Agarwal, Shivi, additional, Akber, Saeed, additional, Akdemir, Ahmet Ocak, additional, Alla Hamou, Abdelouahed, additional, Aslan, Sinan, additional, Awasthi, Uday, additional, Azroul, Elhoussine, additional, Batiha, Iqbal M., additional, Bendoukha, Samir, additional, Chatterjee, Kalyan, additional, Chew, Jackel Vui Lung, additional, Djebara, Lamia, additional, Ekinci, Alper, additional, El-Sayed, A.A., additional, Goyal, S.P., additional, Gupta, Rajeev, additional, Hameed, Tooba, additional, Hammouch, Zakia, additional, Hristov, Jordan, additional, İşcan, İmdat, additional, Jain, Shilpi, additional, Jiménez, Salvador, additional, Khan, Najeeb Alam, additional, Khennaoui, Amina Aicha, additional, Kumar, Sanjay, additional, Lamrani Alaoui, Abdelilah, additional, Mandal, Rajasi, additional, Mathur, Trilok, additional, Moustafa, Shimaa I., additional, Moustafa, S.I., additional, Ndaïrou, Faïçal, additional, Ordokhani, Yadollah, additional, Ouannas, Adel, additional, Parmar, Girish, additional, Pham, Viet-thanh, additional, Pritam, K. Satya, additional, Qureshi, Muhammad Ali, additional, Razzaq, Oyoon Abdul, additional, Rehman, Daniyal Ur, additional, Sabermahani, Sedigheh, additional, Saini, Rita, additional, Sandhu, Har Amrit Singh, additional, Saraswat, Ram Naresh, additional, Set, Erhan, additional, Shehata, A., additional, Shehata, Ayman, additional, Singh, Sanjay Kumar, additional, Sulaiman, Jumat, additional, Sunarto, Andang, additional, Tak, Ajay, additional, Torres, Delfim F.M., additional, Usero, David, additional, Vázquez, Luis, additional, Vázquez-Poletti, J. Luis, additional, and Velasco, M. Pilar, additional

Published
2023
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23. Hyperchaotic Oscillator with Line and Spherical Equilibria: Stability, Entropy, and Implementation for Random Number Generation.

Author

Shukur, Ali A., Pham, Viet-Thanh, Tamba, Victor Kamdoum, and Grassi, Giuseppe

Abstract

We present a hyperchaotic oscillator with two linear terms and seven nonlinear terms that displays special algebraic properties. Notably, the introduced oscillator features distinct equilibrium types: single-point, line, and spherical equilibria. The introduced oscillator exhibits attractive dynamics like hyperchaos with two wing attractors. To gain a better understanding, we provide the bifurcation and Lyapunov exponents. The Kolmogorov–Sinai entropy is applied to show the complexity of the oscillator. A microcontroller realization confirms the reliability of the oscillator. The proposed oscillator is successfully applied for RNG. [ABSTRACT FROM AUTHOR]

Published
2024
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24. A Rectified Linear Unit-Based Memristor-Enhanced Morris–Lecar Neuron Model.

Author

Almatroud, Othman Abdullah, Pham, Viet-Thanh, and Rajagopal, Karthikeyan

Subjects
*MACHINE learning, *LYAPUNOV exponents, *MAGNETIC flux, *BIFURCATION diagrams, *SYNCHRONIZATION
Abstract

This paper introduces a modified Morris–Lecar neuron model that incorporates a memristor with a ReLU-based activation function. The impact of the memristor on the dynamics of the ML neuron model is analyzed using bifurcation diagrams and Lyapunov exponents. The findings reveal chaotic behavior within specific parameter ranges, while increased magnetic strength tends to maintain periodic dynamics. The emergence of various firing patterns, including periodic and chaotic spiking as well as square-wave and triangle-wave bursting is also evident. The modified model also demonstrates multistability across certain parameter ranges. Additionally, the dynamics of a network of these modified models are explored. This study shows that synchronization depends on the strength of the magnetic flux, with synchronization occurring at lower coupling strengths as the magnetic flux increases. The network patterns also reveal the formation of different chimera states, such as traveling and non-stationary chimera states. [ABSTRACT FROM AUTHOR]

Published
2024
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25. A New 3D Chaotic System with only Quadratic Nonlinearities: Analysis and Circuit Implantation

Author

Hosseini, Seyede Sanaz, Jafari, Mohammad-Ali, Jafari, Sajad, Pham, Viet-Thanh, Wang, Xiong, Zelinka, Ivan, Series Editor, Adamatzky, Andrew, Series Editor, Chen, Guanrong, Series Editor, Abraham, Ajith, Editorial Board Member, Lucia, Ana, Editorial Board Member, Burguillo, Juan C., Editorial Board Member, Čelikovský, Sergej, Editorial Board Member, Chadli, Mohammed, Editorial Board Member, Corchado, Emilio, Editorial Board Member, Davendra, Donald, Editorial Board Member, Ilachinski, Andrew, Editorial Board Member, Lampinen, Jouni, Editorial Board Member, Middendorf, Martin, Editorial Board Member, Ott, Edward, Editorial Board Member, Pan, Linqiang, Editorial Board Member, Păun, Gheorghe, Editorial Board Member, Richter, Hendrik, Editorial Board Member, Rodriguez-Aguilar, Juan A., Editorial Board Member, Rössler, Otto, Editorial Board Member, Snasel, Vaclav, Editorial Board Member, Vondrák, Ivo, Editorial Board Member, Zenil, Hector, Editorial Board Member, Wang, Xiong, editor, and Kuznetsov, Nikolay V., editor

Published
2021
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26. A Comprehensive Analysis on the Wang-Chen System: A Challenging Case for the Šil’nikov Theory

Author

Bayani, Atiyeh, Jafari, Mohammad-Ali, Jafari, Sajad, Pham, Viet-Thanh, Zelinka, Ivan, Series Editor, Adamatzky, Andrew, Series Editor, Chen, Guanrong, Series Editor, Abraham, Ajith, Editorial Board Member, Lucia, Ana, Editorial Board Member, Burguillo, Juan C., Editorial Board Member, Čelikovský, Sergej, Editorial Board Member, Chadli, Mohammed, Editorial Board Member, Corchado, Emilio, Editorial Board Member, Davendra, Donald, Editorial Board Member, Ilachinski, Andrew, Editorial Board Member, Lampinen, Jouni, Editorial Board Member, Middendorf, Martin, Editorial Board Member, Ott, Edward, Editorial Board Member, Pan, Linqiang, Editorial Board Member, Păun, Gheorghe, Editorial Board Member, Richter, Hendrik, Editorial Board Member, Rodriguez-Aguilar, Juan A., Editorial Board Member, Rössler, Otto, Editorial Board Member, Snasel, Vaclav, Editorial Board Member, Vondrák, Ivo, Editorial Board Member, Zenil, Hector, Editorial Board Member, Wang, Xiong, editor, and Kuznetsov, Nikolay V., editor

Published
2021
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27. A New Chaotic System with Equilibria Located on a Line and Its Circuit Implementation

Author

Nazarimehr, Fahimeh, Jafari, Mohammad-Ali, Jafari, Sajad, Pham, Viet-Thanh, Wang, Xiong, Chen, Guanrong, Zelinka, Ivan, Series Editor, Adamatzky, Andrew, Series Editor, Chen, Guanrong, Series Editor, Abraham, Ajith, Editorial Board Member, Lucia, Ana, Editorial Board Member, Burguillo, Juan C., Editorial Board Member, Čelikovský, Sergej, Editorial Board Member, Chadli, Mohammed, Editorial Board Member, Corchado, Emilio, Editorial Board Member, Davendra, Donald, Editorial Board Member, Ilachinski, Andrew, Editorial Board Member, Lampinen, Jouni, Editorial Board Member, Middendorf, Martin, Editorial Board Member, Ott, Edward, Editorial Board Member, Pan, Linqiang, Editorial Board Member, Păun, Gheorghe, Editorial Board Member, Richter, Hendrik, Editorial Board Member, Rodriguez-Aguilar, Juan A., Editorial Board Member, Rössler, Otto, Editorial Board Member, Snasel, Vaclav, Editorial Board Member, Vondrák, Ivo, Editorial Board Member, Zenil, Hector, Editorial Board Member, Wang, Xiong, editor, and Kuznetsov, Nikolay V., editor

Published
2021
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28. Hidden Attractors in a Dynamical System with a Sine Function

Author

Volos, Christos, Maaita, Jamal-Odysseas, Pham, Viet-Thanh, Jafari, Sajad, Zelinka, Ivan, Series Editor, Adamatzky, Andrew, Series Editor, Chen, Guanrong, Series Editor, Abraham, Ajith, Editorial Board Member, Lucia, Ana, Editorial Board Member, Burguillo, Juan C., Editorial Board Member, Čelikovský, Sergej, Editorial Board Member, Chadli, Mohammed, Editorial Board Member, Corchado, Emilio, Editorial Board Member, Davendra, Donald, Editorial Board Member, Ilachinski, Andrew, Editorial Board Member, Lampinen, Jouni, Editorial Board Member, Middendorf, Martin, Editorial Board Member, Ott, Edward, Editorial Board Member, Pan, Linqiang, Editorial Board Member, Păun, Gheorghe, Editorial Board Member, Richter, Hendrik, Editorial Board Member, Rodriguez-Aguilar, Juan A., Editorial Board Member, Rössler, Otto, Editorial Board Member, Snasel, Vaclav, Editorial Board Member, Vondrák, Ivo, Editorial Board Member, Zenil, Hector, Editorial Board Member, Wang, Xiong, editor, and Kuznetsov, Nikolay V., editor

Published
2021
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31. Synchronization of Fractional-Order Discrete-Time Chaotic Systems

Author

Ouannas, Adel, Grassi, Giuseppe, Azar, Ahmad Taher, Khennaouia, Amina–Aicha, Pham, Viet-Thanh, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Hassanien, Aboul Ella, editor, Shaalan, Khaled, editor, and Tolba, Mohamed Fahmy, editor

Published
2020
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32. Chaotic Control in Fractional-Order Discrete-Time Systems

Author

Ouannas, Adel, Grassi, Giuseppe, Azar, Ahmad Taher, Khennaouia, Amina Aicha, Pham, Viet-Thanh, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Hassanien, Aboul Ella, editor, Shaalan, Khaled, editor, and Tolba, Mohamed Fahmy, editor

Published
2020
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36. List of contributors

Author

Adhikary, Avishek, primary, Akbar, Saeed, additional, Alagoz, Baris Baykant, additional, Alagoz, Serkan, additional, Ansari, A.Q., additional, Bahramian, Alireza, additional, Batiha, Iqbal M., additional, Bertsias, Panagiotis, additional, Biswas, Karabi, additional, Denoun, Hakim, additional, Elwakil, Ahmed S., additional, Fekik, Arezki, additional, Ghassemi, Farnaz, additional, Ghosh, Arunangshu, additional, Gupta, Maneesha, additional, Hameed, Tooba, additional, Hamida, Mohamed Lamine, additional, Hashmi, M.S., additional, Houassine, Hamza, additional, Jafari, Sajad, additional, Jahanzaib, Lone Seth, additional, Jhat, Zahoor Ahmad, additional, John, Dina Anna, additional, Kapoulea, Stavroula, additional, Kaur, Gagandeep, additional, Khan, Ayub, additional, Khan, Najeeb Alam, additional, Khanday, Farooq Ahmad, additional, Khennaoui, Amina-Aicha, additional, Kumar, Sanjeev, additional, Malik, Gul Faroz Ahmad, additional, Mishra, Shalabh K., additional, Nazarimehr, Fahimeh, additional, Nouri, Ali, additional, Ouannas, Adel, additional, Pandey, Neeta, additional, Pandey, Rajeshwari, additional, Pham, Viet-Thanh, additional, Psychalinos, Costas, additional, Qureshi, Muhammad Ali, additional, Radwan, Ahmed G., additional, Rajagopal, Karthikeyan, additional, Said, Lobna A., additional, Shad, Ensieh Ghaffari, additional, Shah, Zaid Mohammad, additional, Tabanfar, Zahra, additional, Trikha, Pushali, additional, Upadhyay, Dharmendra K., additional, Vaidyanathan, Sundarapandian, additional, Verma, Rakesh, additional, and Yassa, Nacera, additional

Published
2022
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49. Multistable Memristor Synapse-Based Coupled Bi-Hopfield Neuron Model: Dynamic Analysis, Microcontroller Implementation and Image Encryption.

Author

Tamba, Victor Kamdoum, Biamou, Arsene Loic Mbanda, Pham, Viet-Thanh, and Grassi, Giuseppe

Subjects
IMAGE encryption, ARTIFICIAL neural networks, HOPFIELD networks, MICROCONTROLLERS, ELECTRONIC equipment
Abstract

The memristor, a revolutionary electronic component, mimics both neural synapses and electromagnetic induction phenomena. Recent study challenges are the development of effective neural models and discovering their dynamics. In this study, we propose a novel Hopfield neural network model leveraging multistable memristors, showcasing its efficacy in encoding biomedical images. We investigate the equilibrium states and dynamic behaviors of our designed model through comprehensive numerical simulations, revealing a rich array of phenomena including periodic orbits, chaotic dynamics, and homogeneous coexisting attractors. The practical realization of our model is achieved using a microcontroller, with experimental results demonstrating strong agreement with theoretical analyses. Furthermore, harnessing the chaos inherent in the neural network, we develop a robust biomedical image encryption technique, validated through rigorous computational performance tests. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Oscillator with Line of Equilibiria and Nonlinear Function Terms: Stability Analysis, Chaos, and Application for Secure Communications.

Author

Almatroud, Othman Abdullah, Shukur, Ali A., Pham, Viet-Thanh, and Grassi, Giuseppe

Subjects
NONLINEAR functions, NONLINEAR oscillators, ADAPTIVE control systems, BANACH spaces
Abstract

We explore an oscillator with nonlinear functions and equilibrium lines that displays chaos. The equilibrium stability and complexity of the oscillator have been analysed and investigated. The presence of multiple equilibrium lines sets it apart from previously reported oscillators. The synchronization of the oscillator is considered as an application for secure communications. An observer is designed by considering a transmitted signal as a state, in other words, by injecting a linear function satisfying Lipschitz's condition to the proposed oscillator. Moreover, the adaptive control of the new oscillator is obtained. [ABSTRACT FROM AUTHOR]

Published
2024
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