Applied materials engineering research : Selected peer-reviewed full text papers from the 6th ICAEMM and 4th ICMER / by International Conference on Applied Engineering, Materials and Mechanics (6th : 2021 : Kuala Lumpur, Malaysia) organiser, Hu, Jong Wan, editor 632387, International Conference on Material Engineering Research (4th : 2021 : Incheon, South Korea) organiser