Investigation and Evaluation of Noise Level of the Busan Subway

Abstract

Noise levels of the three subway lines of Busan city have been investigated. Averaged cabin noise of the train has been measured during the train trip for each station. It has been measured with separation of day time (9:00~18:00) and night time (18:00~22:00) measurements but there was no big difference on the measured data. Repeating for the measured data has been confirmed with twice measurements in May and June 2010. Several noise effects to the subway noise levels of Busan are explained. Those are screen door effect, rail road surface condition, subway train type and curvature of railway. Among three subway lines of Busan city, the line 2 is relatively noisy and its reasons are studied. It has been shown that the screen door effect is 10 dB(A) and S shape of sharp curve contributes in high noise level

A Study on the Psychological Well-being and Stress Spectrum of Pet Parrots

“…앵무새의 사육 중 스트레스를 줄이려면 각종 스트레스 요인을 알아야 하며, 각 요인별 스트레스 수치를 측정하여 어떤 요인이 얼마만큼의 스트레스를 주는지 정량화하여야 한다. 앵무새의 스트레스 징후를 측정하는 실험을 실행하기 위하여서는 앵무새의 스트레스를 유발하여야 하는데, 조류를 연구한 선행논문에 따르면 소음 [4]및 [6], 인공적인 광원 [7] [8], 먹이 [9], 제한된 공간 [9]등의 다양한 환경적 자극이 스트레스에 기인하는 것으로 연구되었다 [5]. 본 연구를 위한 앵무새의 사육환경에 따른 스트레스 유발요인을 탐구하기 위해서 상업화된 조류인 가금류의 스트레스 관련연구를 조사하였다.…”

Effects of Platform Screen Doors on Sound Fields in Underground Stations

“…PSDs have a positive impact on safety in train stations, and they also have an effect on the train noise in stations because they are a type of wall that blocks the noise generated by trains. Some studies have reported that the acoustic environments in underground stations were improved by isolating the train noises [7,[10][11][12][13][14]. The strongest effect of the use of PSDs is the reduction of the train noise level.…”

“…The strongest effect of the use of PSDs is the reduction of the train noise level. Reported noise reduction levels produced by the presence of PSDs in underground stations ranged from 9 to 18 dB in field measurements [10][11][12][13][14]. In the case of underground stations in the Seoul Metro, in South Korea, the equivalent sound pressure levels of the train noise from the arrival to departure process in stations with PSDs were approximately 71 dB(A), whereas those in stations without PSDs ranged from approximately 78 to 82 dB(A) [10].…”