Please select one of the following; *delete as appropriate: *(A) This thesis does not contain any materials from papers published in peer-reviewed journals or from papers accepted at conferences in which I am listed as an author. *(B) This thesis contains material from paper(s) published in the following peerreviewed journal(s) / from papers accepted at conferences in which I am listed as an author. Chapter 3 and 4 are published as Tan, Y. H., Hitesh, A., & Li, K. H. H. (2021). Application of machine learning algorithm on mems-based sensors for determination of helmet wearing for workplace safety. Micromachines, 12(4).