A new method is proposed for the simultaneous measurement of the ultrasonic wave velocity and the thickness of a solid plate with access from only one side. A line-contact transmitter and a line-contact receiver were placed on the same side of the specimen, and the times of flight were measured for varying distance between the transducers. The ultrasonic wave velocity and the thickness of the specimen can be simultaneously determined from the relationship between the time of flight and the ultrasonic beam path. A least-squares fitting routine was employed to increase the accuracy of the measurements. Experimental results for several specimens of different materials as well as different thicknesses show good agreement with those measured by conventional methods.
This study aimed to examine predictors of the intention to protect personal information on Facebook. We conducted an online survey of 679 Facebook users in the Republic of Korea. The findings of this study showed that usefulness and ease of use had significant effects on attitudes toward protection behavior. The results also revealed that risk factors (privacy risk severity and vulnerability) had significant effects on protective behaviors. Based on our findings, we discussed the information protection of privacy on Facebook.
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