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