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24. Mofid O, Amirkhani S, Din Su, Mobayen S,
Vu MT, Assawinchaichote W. Finite-time con- Saim Ahmed received his B.S degree in Electronics
vergence of perturbed nonlinear systems using Engineering from Sir Syed University of Science and
adaptive barrier-function nonsingular sliding Technology, Karachi, Pakistan in 2009. He received
mode control with experimental validation. his M.E degree in Industrial Control and Automation
Journal of Vibration and Control. 2023;29(13- from Hamdard University, Karachi, Pakistan, in 2013.
14):3326–3339. He completed his Ph.D. degree in control science and
http://dx.doi.org/10.1177/10775463221094889 engineering from Nanjing University of Science and
25. Rojsiraphisal T, Mobayen S, Asad JH, Vu MT, Technology, China in 2019. He has served as an As-
Chang A, Puangmalai J. Fast terminal sliding sistant Professor at the Department of Mechatronics,
control of underactuated robotic systems based Shaheed Zulfikar Ali Bhutto Institute of Science and
on disturbance observer with experimental vali- Technology, Karachi, Pakistan. He is currently work-
dation. Mathematics. 2021;9(16):1935. ing as a Postdoctoral Researcher at Prince Sultan Uni-
http://dx.doi.org/10.3390/math9161935 versity, Saudi Arabia. His research interests include
26. Ahmed S, Azar AT, Ibraheem IK. Model-free the theory and applications of adaptive control, sliding
scheme using time delay estimation with fixed- mode control, time delay control, robotic exoskeleton
time fsmc for the nonlinear robot dynamics. and manipulators, nonlinearities and their compensa-
AIMS Mathematics. 2024;9(4):9989–10009. tion.
https://doi.org/10.3934/math.2024489 https://orcid.org/0000-0002-2302-705X
433