1. Lviv Polytechnic National University,Information Systems and Networks Department,Lviv,Ukraine
2. Lviv Polytechnic National University,Lviv,Ukraine
3. Ivan Franko Drohobych State Pedagogical University,Physics and Information Systems Department,Drohobych,Ukraine
4. Lviv Polytechnic National University,Telecommunication Department,Lviv,Ukraine
5. West Ukrainian National University,Accounting and Taxation Department,Ternopil,Ukraine