Control theory Automatic control 412 Mathematical optimization 84 Feedback control systems 54 Mathematical models 46 System analysis 42 PID controllers 36 Linear control systems 33 Systems engineering 31 Linear systems 27 Fuzzy systems 24 Intelligent control systems 22 Automation 21 Pendulum 21 Nonlinear systems 18 Mathematics 17 Congresses 16 Data processing 16 Design and construction 16 Robotics 16 Predictive control 15 Robust control 15 Discrete-time systems 14 Nonlinear theories 14 Refuse and refuse disposal 14 Nonlinear control theory 13 Sliding mode control 13 MATLAB 12 Wheelchairs 12 Adaptive control systems 11