... From the research that has been carried out, we can conclude that: The concept of obsever-by-wire is given and a systematic study of observe-by-wire is provided in order to give a possible method ... result. Operators can observe the operating situations of the forks and its environment by feeling the magnitude of the torque in the equation (3). The negative value is added in equation (3) ... Education, Cheonan, Korea (E-mail: bmnhy2003@gmail.com) 2School of Mechanical Engineering, Korea University of Technology and Education, Cheonan, Korea (Tel : +8 2-4 1-5 6 0-1 250; E-mail: jhryu@kut.ac.kr)...