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Fixed-time sliding mode control with disturbance observer and variable exponent coefficient for nonlinear
systems
reviewer for top journals, including IEEE Trans- served as a Lecturer at COMSATS University,
actions, Nonlinear Dynamics, and Fuzzy Sets and Attock campus, from 2013 to 2017. He holds
Systems. a Ph.D. degree from the School of Automation,
https://orcid.org/0000-0002-7622-1788 Nanjing University of Science and Technology,
China. Currently, he is an Associate Professor
at the School of Mechanical and Electrical En-
gineering, Quanzhou University of Information
Rizwan Ullah received his B.S. in Electronics Engineering. His research interests include net-
Engineering from COMSATS University, Abbot- work control systems, fuzzy systems, time-delay
tabad campus, Pakistan, in 2009, and his M.S. systems, nonlinear systems, multi-agent systems,
in Electrical Engineering from COMSATS Uni- and reinforcement learning.
versity, Attock campus, Pakistan, in 2013. He https://orcid.org/0000-0001-9218-5281

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