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정진연(Chung, Jin-Yun),임정빈(Im, Jung-Bin),이성찬(Lee, Sung-Chan) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.2
The noise by the construction activities is one of the main issues in Korea. To prevent the noise from construction site, construction company installs temporary noise barriers along the construction site boundary. Normally sound insulation performance ($R_w$) of the temporary noise barriers made by metal or plastic is between 18 and 31 dB and metallic noise barriers are around 5 dB higher than plastic noise barriers. Sound absorption performance (NRC) of the temporary noise barriers are between 0.20 and 0.59 so it's difficult to characterize their acoustic performance. In this study, it has founded that sound insulation performance of the temporary noise barrier has been improved about 3dB by stick the high density acoustic sheet and insertion loss of noise barrier is getting increased as the source and receiver approached the temporary noise barriers.
슬래브 상부 몰탈층에 사용된 작은시편의 유효성 검토(중량충격음을 중심으로)
정진연(Chung, Jin-Yun) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.2
This study examined small-size specimen's effectiveness that is used to evaluate floor impact sound performance. Floor impact sound level of small-size specimen is higher than full-size. This is due to excessive impact power of Bang machine. Impact hammer that has small impact power relatively can solve this problem. But, according to the size of specimen, mode shape and frequency that influence to structural borne sound is changed. Slab mode of full-size specimen was changed to frequency design of resilient materials. But in case of small-size specimen, there is no change of vibration mode by resilient materials change, Vibration mode of small-size specimen is the same. Therefore, it is not proper that use small-size specimen in floor impact sound estimation.
이성찬(Sung Chan Lee),정진연(Jin Yun Chung),임정빈(Jung Bin Im) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
There are a lot of different types of noise from construction site and it depends on construction stage, equipment type and number of operating equipments. The problem is almost noise from construction site is high level and some kinds of noise levels are over 100dB. In addition, if construction site is located in downtown, there are a few options to reduce noise level. Therefore several site mitigation plans are developed to reduce different types of construction noises and it is applied in site and evaluated noise reduction performance in this study.