In particular, the invention provides {HEAD ~ a simple but accurate technique} for estimating the average overall deformation of a structural member, without using {TAIL ~ optical devices} and without a large number of sensors 
In particular , the invention provides { HEAD ~ a simple but accurate technique } for estimating the average overall deformation of a structural member , without using { TAIL ~ optical devices } and without a large number of sensors
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH