For a particular application, the region of {TAIL ~ influence} of {HEAD ~ an actuator} can be determined theoretically or empirically 
For a particular application , the region of { TAIL ~ influence } of { HEAD ~ an actuator } can be determined theoretically or empirically
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH