Table 1.
Results of session analysis according to ultra-sonic measurement method

Ultra-sonic test methods	MOEu mean.(GPa)	COV(%)	MOEu-MOELCOD	MOEu-MOENCOD
I	13.9	13.2	0.92	0.65
II	9.2	26.7	0.68	0.48
III	8.2	29.8	0.77	0.65
IV	8.7	21.6	0.6	0.62
V	8	28.5	0.66	0.39
VI	13.2	15.6	0.64	0.36
VII	13	21.1	0.77	0.71
VIII	8.8	17.5	0.32	0.18
IX	7.1	24.5	0.43	0.34
X	8.3	18.1	0.59	0.43

COV: coefficient of variation,
COD: coefficient of determination
MOE_L: MOE measured by longitudinal vibration method
MOE_u: MOE measured by ultra-sonic method, MOE_N: MOE measured by non-destructive bending method