In a motion effector for use in a virtual reality system, a plant is a target of control and for producing an output signal reflecting the actual movement of a moving part therein and a reference input provider provides {HEAD ~ a reference input signal} which reflects {TAIL ~ a desired motion} of the plant 
reflects
In a motion effector for use in a virtual reality system , a plant is a target of control and for producing an output signal reflecting the actual movement of a moving part therein and a reference input provider provides { HEAD ~ a reference input signal } which reflects { TAIL ~ a desired motion } of the plant
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