TY JOUR TI THE EXPEDIENCY TO USE MODELING TO ESTIMATE THE SYSTEM OF SOCIETY SECURITY KW modeling KW elimination of emergency situations KW economic efficiency KW methods of estimation KW costs forecast JO Problems of risk management in the technosphere AU Galitsyn, M.V. AU Medvedev, V.P. PY 2016 IS 2016 PB Saint-Petersburg University of State Fire Service of Emercom of Russia