S. Thirumalai Kumaran, PhD, is an associate professor in the Department of Mechanical Engineering, PSG Institute of Technology and Applied Research, Chennai, India. He completed his PhD in mechanical engineering in 2015 from Kalasalingam Academy of Research and Education. He has published more than 100 articles in SCI journals and received a gold medal in manufacturing engineering from the Government College of Technology in 2008. Tae Jo Ko, PhD, is a professor at the School of Mechanical Engineering, Yeaungnam University, Gyeongsan-si, South Korea. He received a PhD in mechanical engineering from POSTECH, South Korea. Professor Tae Jo Koe has more than 300 publications in SCI journals, and has launched new research in rechargeable batteries and digital twins for manufacturing. He is the editor of the International Journal of Precision Engineering and Manufacturing and the Journal of Nanotechnology.