Kwon (2015)

Lifting work/Erection work/Dismantling work/Climb work /Others work

Choi (2017)

Machine factor/Management factor/Erection·Dismantling·Climb factor/Operation factor

Song (2018)

Erection work/Climbing work/Dismantling work/Common

Kim (2018)

Erection work/Climb work/Tower carne operation