A laser ultrasonic system that allows for the excitation and detection of high frequency (GHz range) acoustic waves using low frequency, low cost detection electronics is presented. A continuous wave diode laser source, operating at a wavelength of 1544nm, is amplitude modulated using an integrated electro-absorption modulator and used to excite high frequency, narrow bandwidth acoustic waves. ...

BACKGROUND Acoustic puncture assist device (APAD™) is a pressure measurement combined with a related acoustic signal that has been successfully used to facilitate epidural punctures. The principal of loss of resistance (LOR) is similar when performing paravertebral block (PVB). We investigated the usefulness of APAD™ by comparing it with the conventional LOR techniques for identifying paraverte...

BACKGROUND AND PURPOSE The increased cochlear signal on FLAIR images in patients with acoustic neuroma is explained by an increased concentration of protein in the perilymphatic space. However, there is still debate whether there is a correlation between the increased cochlear FLAIR signal and the degree of hearing disturbance in patients with acoustic neuroma. Our aim was to investigate the cl...

In this paper, we propose an acoustic model training technique which is robust against outliers such as clipping, unexpected noise, poorly pronounced word segments, or mistranscriptions, which deteriorate the quality of the acoustic models and in turn decrease speech recognition performance. The outlier-robust acoustic model training technique is based on a maximum likelihood (ML) criterion and...

Electrotechnical services spend a significant amount of time on cable tracing and conductor identification operations. Although the operation seems an easy job deeply researched topic, it may turn out to be time-consuming due large quantity unidentified conductors (cables) certain stipulation that should de-energized have uninsulated parts. This paper proposes method based use acoustic signal a...