TY JOUR TI TO THE QUESTION OF PROBABILITY ESTIMATES OF DETECTION OF FIRE BY FIRE ALARM SYSTEMS KW system effectiveness KW malfunctioning KW fire alarm system KW information security JO NATURAL AND MAN-MADE RISKS (PHYSICO-MATHEMATICAL AND APPLIED ASPECTS) AU Kutuzov, V.V. AU Polyanskaya, T.V. AU Povarov, A.V. PY 2015 IS 2015 PB Saint-Petersburg University of State Fire Service of Emercom of Russia