The name and email address on the OPSI Journal will be used exclusively for the purposes specified in this journal and will not be used for any other purpose or by anyone else.
Secretariat: Industrial Engineering Department Faculty of Industrial Engineering, UPN "Veteran" Yogyakarta d.a Jalan Babarsari 2 Tambakbayan Yogyakarta 55281 Telp. (0274) 486256 Website http://jurnal.upnyk.ac.id/index.php/opsi email : jurnal.opsi@upnyk.ac.id