Shearer dynamic positioning is a key factor for coal mine equipment automation, and it is feasible to shearer positioning using the strapdown inertial navigation system(SINS). Yet, it is very difficult to guarantee positioning accuracy by error influence. This paper provided a method for shearer positioning error analysis. Firstly, we built the shearer state equation and put forward a method ca...

introduction : the dynamic interaction between mother and infant is one of the indicative factors of infants’ social and emotional development especially in stressful situations as cognitive evaluating. methods: an experimental study was completed in 2010 in tehran on a total of 40 infants (18 boys and 22girls) forming two alternative groups and varying in age of infancy (4, 6, 8, 10 and 12 mon...