1. Doctoral Program of Information Systems, Universitas Diponegoro, Semarang 50241, Indonesia
2. Faculty of Science Technology, Universitas Bina Darma, Palembang 30264, Indonesia
3. Faculty of Engineering, Universitas Diponegoro, Semarang 50275, Indonesia
4. Faculty of Science and Mathematics, Universitas Diponegoro, Semarang 50275, Indonesia