The study on the database for the noise of the large machine and high power machine. The object of this project is to prepare the countermeasure of the health care according to investigate and database the basic information of the large machine and high power machine. To accomplish the object ; The dimension and noise of the large machine, which is mounted in the factory, was investigated. And the prediction and measurement method of the noise for the machine by manufacturers were investigated. The database of the noise by the machine type and power was built. The measurement and management methods for the machine noise were considered. The database of the noise was built from the measurement data. The major sound sources and frequency range for the large machine and the high power machine were investigated. The noise effect by the large machine and the high power machine was investigated. The application fields are; The setting of the management plan of the noise which generates from the large machine and the high power machine. The effective noise reduction for the major sound source with low cost. The application as the frequency transition considering the psycho-acoustics characteristics.

The object of this project is to prepare the countermeasure of the health care according to investigate and database the basic information of the large machine and high power machine. To accomplish the object; The dimension and noise of the large machine, which is mounted in the factory, was investigated. The prediction and measurement method of the noise for the machine by manufacturers were investigated. The noise at the 500 points of the large machine and high power machine in the 40 processes of the 6 factories, 6 business fields was measured. The database of the noise was built from the measurement data. The major sound sources and frequency range for the large machine and the high power machine were investigated. The noise effect by the large machine and the high power machine was investigated.

Idiopathic sudden sensorineural hearing loss (ISSNHL) is an emergent disease in otologic field. Audiometric follow-up in patients with ISSNHL is important to assess the benefit of treatment and guide initiation of salvage treatment. However, there have been no report to guide the timing of follow-up. The objective of this study was to compare the recovery duration of patients who diagnosed as ISSNHL in each age group. A total of 150 subjects were included in this study and reviewed the medical and audiological records. According to ages, the subjects were classified into four groups; 0-19, 20-39, 40-59 years old and more than 60 years old. The period of time to final hearing levels was compared based on Siegel’s criteria. The period of time to final hearing levels was significantly different in patients with complete recovery based on Siegel’s criteria. 20-39 group (10.3 days) showed faster recovery than 0-19 (18 days), 40-59 (15 days) and ≥60 groups (23.4 days). The period of time to final hearing levels was not significantly different in patients with partial and slight recovery. Young adults with ISSNHL appear to recover faster than other age groups with ISSNHL. The result suggests that children and the elderly with ISSNHL need longer follow-up for hearing and young adults with refractory ISSNHL need earlier initiation of salvage treatment.