TY CONF TI ANALYSIS OF TIME-FREQUENCY TRANSFORMATIONS OF NON-STATIONARY QUASIPERIODIC BIOMEDICAL SIGNALS KW biomedical signals KW time-frequency transformations KW non-stationary quasi-periodic signals KW pattern recognition JO XIV International Scientific Conference "System Analysis in Medicine" AU Alehin, M.D. AU Bogomolov, A.V. PY 2025 PB Far Eastern Scientific Center of Physiology and Pathology of Respiration