Introduction.- Mathematical Preliminaries.- Vibration Control for Flexible Beam Based on LMI.- Vibration Control for Flexible String Based on LMI.- Basic Vibration Control for Three-Dimensional Flexible String with Variable Length.- Vibration Control for Three-Dimensional Flexible String with Variable Length and Input Constraint.- Vibration Control of Three-Dimensional Length-Varying Flexible String with Input Quantization.- Basic Vibration Control...