Sumar Hadi Suryo Department of Mechanical Engineering, Faculty of Engineering, Diponegoro University,
Jl. Prof. Soedarto, SH, Undip Tembalang, Semarang City, Indonesia 50275 Indonesia
Mechanical Engineering Lecturer
Ari Teliti Wilarsati Department of Mechanical Engineering, Faculty of Engineering, Diponegoro University,
Jl. Prof. Soedarto, SH, Undip Tembalang, Semarang City, Indonesia 50275 Indonesia