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한찬훈,홍성신,Haan, Chan-Hoon,Hong, Seong-Shin 한국음향학회 2016 韓國音響學會誌 Vol.35 No.3
공동주택단지 및 학교 및 근린시설의 경계방음벽으로 제시한 식생형 방음벽을 설계하고 소음감쇠성능실험을 실시하였다. 본 논문에서 제시한 식생형 방음벽은 일정한 형태의 유닛을 방음벽 형태의 구조물에 걸이식으로 적층하여 구성된 것으로서, 유닛내부에는 식재 및 토양을 포함하고 있다. 이 방음벽의 음향적인 장점은 토양 및 식재를 이용한 흡음뿐만 아니라 확산형상의 방음벽에서 표면 확산으로 인해 음에너지가 분산되어 소음을 저감할 수 있을 것으로 예상된다. 먼저 1/10 축소모형 실험을 통해 소음감쇠성능에 가장 적합한 방음벽 유닛의 크기를 조사하였으며, 설계된 도면에 따라 1/2축척의 식생형 방음벽을 실제높이 2 m, 길이 5 m로 제작하여 소음감쇠실험을 진행하였다. 식물을 담을 수 있는 총 1,137개의 식생블록은 약 $10{\times}10{\times}9cm$ 크기로 합성목재를 활용해 제작하였으며 이 블록들을 방음벽에 설치하여 자립형 구조를 가진 식생형 방음벽을 완성하였다. 연구결과, 평면형 방음벽보다 블록식 방음벽이 약 7 dB 더 높은 삽입손실을 나타냈으며, 식생블록의 크기는 삽입손실효과가 큰 $20{\times}20cm$의 크기가 적정한 것으로 나타났다. Design of a vegetation type sound barrier was presented as a noise barrier on the boundary of neighborhood facilities including schools, and apartments. The suggested noise barrier is made of unit blocks that are to be formed by stacking over the wall structure containing the plant and soils in the blocks. The advantage of the vegetation noise barrier is to acquire not only sound absorptive effects of plants and soils, but also sound diffusive effect caused by the irregular surface of the barrier which could eventually mitigate the noise. First, the optimum size of the units to obtain the highest noise reduction was investigated using 1/10 scaled model experiment, and sound attenuation experiments were carried out using a 1/2 mock-up model which is 2 m high and 5 m long. Total 1,137 unit blocks were made of synthetic woods with the size of $10{\times}10{\times}9cm$. These unit blocks were installed on the both side of the 1/2 mock-up steel framed noise barrier. As a result, it was revealed that the block typed vegetation noise barrier has 7 dB higher insertion loss in comparison with the general plane noise barrier. Also, it was found that the appropriate size of unit blocks is $20{\times}20cm$ which has large effect of sound insertion loss.
공동주택 마감 모르타르 양생 기간에 따른 중량충격음 저감성능 분석
구본수(Koo, Bon-Soo),홍성신(Hong, Seong-Shin),김신태(Kim, Sin-Tae),김명준(Kim, Myung-Jun) 한국건축친환경설비학회 2024 한국건축친환경설비학회 논문집 Vol.18 No.1
In this study, we compared the heavy-weight impact sound reductions by bang machine and rubber ball according to the curing period of finishing mortar at construction sites of apartment. And the changes of reductions before and after mortar crack sealing were examined. As a result, it was found that the performance differences of impact sound insulation in single number quantity (SNQ, LiA,Fmax) were minimal after the 4-week curing period of the finishing mortar in case of the bang machine. Similarly, in case of the rubber ball, the performance differences were also decreased within 1.0 dB after the 4-week curing period. Therefore, it can be estimated that the curing period of the finishing mortar must be secured for at least 4 weeks for the reliable test result of impact sound insulation. In addition, the improvement of impact sound insulation (SNQ, LiA,Fmax) by mortar crack sealing were 0.8 to 2.5 dB for the bang machine. Even though the improvement for the rubber ball were insignificant in comparison with the bang machine, the results showed that finishing mortar crack sealing is an essential requirement to prevent deterioration in impact sound insulation.
정홍성(Hong Seong Jeong),김선훈(Seon Hoon Kim),이유신(Yoo Shin Lee) 대한피부과학회 1987 대한피부과학회지 Vol.25 No.4
Congenital smooth musele hamartomas appear at birth as hypertrichotic patches or plaques with or without hyperpigmentation. Histologic characteristic is hyperplasia of dermal smooth muscle bundles. We report a case of congenital smooth muscle harnartoma in 5-year-old female, who showed localized excessive-hairy, skin-colored patch on the lateral surface of left. elbow, which were found at birth. Biopsy specimen showed hyperpigmentation of the basal layers of epidermis, melanophages in upper dermis, and hyperplasia of smooth muscle bundles in lower dermis.