Presented is a system and method for performing highly sensitive measurement of ultrasonic attenuation in small material volumes. To perform the method, an apparatus of automatically determining a sensing timing in a page buffer of a NAND flash memory device is also disclosed. An insertion bore formed on the second surface has an alignment bore, a fastening bore communicating to the alignment bore and a limit bump formed at the fastening bore. When the moving image being displayed is paused, a still image is displayed based on the frame image data \u201cA\u201d shot using the short exposure time.