The idea of 31st PATTAYA-THAILAND International Conference on “Advances in Engineering and Technology” (PAET-21) scheduled on April 28-30, 2021 at Pattaya (Thailand) is for the researchers, scientists, scholars, engineers and parctitioners from all around the world to present and share ongoing research activities. This conference provides opportunities for the delegates to exchange new ideas and application experiences face to face, to establish business or research relations and to find global partners for future collaboration.