TY JOUR TI ROBOTIZED SYSTEM OF POINTING THE GRIPPER-CUTTING DEVICE ON THE TREE KW logging machine KW gripper KW operator KW automation KW robotics KW manipulator KW control system KW tree gripping KW productivity increase KW operator fatigue JO Forestry Engineering Journal AU Mokhirev, A.P. AU Mohirev, I.A. AU Morozov, D.M. PY 2018 IS 8 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov