A context-aware system is one that gracefully adapts to user environment changes, rendering its applications/services more personalized. Location has been long considered as the most important context and numerous Location Based Services have b

SVPWM：着眼于使形成的磁链轨迹跟踪由理想三相平衡正弦波电压源供电时所形成的基准磁链圆 -SVPWM: focus on the formation of flux trajectory tracking the reference flux circle formed by the ideal of the three-phase balanced sinusoidal voltage source power supply