GDS old Mindyn DTI HSDAC card 0.2hz, 0.02kN amplitude, datum 0.169kN load control, stiffness 0.2kN/mm sample spring stiffness0.0146kN/mm 0.5hz, 0.02kN amplitude, datum 0.169kN load control, stiffness 0.2kN/mm 에서 삼각형 파 0.3hz, 0.02kN amplitude, datum 0.2kN load control, stiffness 0.2kN/mm