System identification Mathematical models 26 Automatic control 21 Nonlinear systems 14 Mathematics 11 Computer programs 8 Data processing 8 Database management 8 Graphical user interfaces (Computer systems) 8 Systems engineering 8 PID controllers 7 Control theory 6 Discrete-time systems 6 Parameter estimation 6 Process control 6 Signal processing 6 System analysis 6 Filters (Mathematics) 5 Heat exchangers 5 Actuators 4 Aeronautics 4 Algorithms 4 Design and construction 4 Digital techniques 4 Fuzzy systems 4 Linear systems 4 Nonlinear theories 4 Rapid prototyping 4 Robust control 4 Sytem identification 4