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 {TAIL ~ a reference input provider} provides {HEAD ~ a reference input signal} which reflects a desired motion of the plant 
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 { TAIL ~ a reference input provider } provides { HEAD ~ a reference input signal } which reflects a desired motion of the plant
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