TY JOUR TI THE MAIN METHODOLOGICAL PRINCIPLES OF THE DEVELOPMENT OF A PHD THESIS AT THE UNIVERSITY OF STATE FIRE SERVICE OF EMERCOM OF RUSSIA KW PhD thesis KW reliability of scientific results KW theoretical and practical significance of results KW optimization of systems KW justification of models JO Psychological and pedagogical problems of human and social security AU Prokhodimova, E.M. AU Reva, Y.V. PY 2023 IS 2023 PB Saint-Petersburg University of State Fire Service of Emercom of Russia