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공동주택 음원실 바닥의 하중 설치에 따른 중량충격음 특성에 관한 연구
김경우,양관섭,손장열,Kim, Kyoung-Woo,Yang, Kwan-Seop,Sohn, Jang-Yeul 한국음향학회 2007 韓國音響學會誌 Vol.26 No.6
공동주택의 바닥충격음 측정 및 평가는 주로 입주 전에 이루어지고 있으나 실제 충격음 발생은 입주 후 커튼과 가구와 같은 중량물이 설치되어 있는 조건이므로 입주 전 후 음원세대(음원실)와 수음세대(수음실)의 상황은 다르다고 할 수 있다. 본 연구에서는 음원실에 가구 등과 같은 하중 설치에 따른 중량충격음 변화정도를 파악하기 위하여 바닥충격음 시험동과 현장에서 활하중($200kg/m^2$) 설치 전 후의 음원실 바닥슬래브 하부 진동가속도레벨 및 수음실 충격음레벨 변화를 측정하였다. 측정결과 하중설치를 통하여 진동가속도레벨 및 충격음레벨이 다소 저감되었으나 큰 영향은 받지 않는 것으로 나타났으며, 슬래브의 공진주파수도 변화하지 않았다. The test and evaluation of floor impact sound is mainly conducted before move in the residence. Floor impact sound generating is actually the conditions in which a heavy load like a curtain and furniture is installed, the situation before and after move in the residence is different. In this study, we investigate the floor impact sound variations according to the live load installation like furniture in the source room. The vibration acceleration level and floor impact sound level variation were measured before and after live load ($200kg/m^2$) installation in the floor impact sound test building and the field. The difference was not large although the vibration acceleration level and the floor impact sound level were reduced through measurement result of load installation. Resonance frequency was not changed by load installation.
재발성 군날개 환자에서 미세 다공성 신전된 폴리테트라플루오로에틸렌 삽입의 임상효과
김경우,김재찬.Kyoung Woo Kim. MD. Jae Chan Kim. MD. PhD 대한안과학회 2013 대한안과학회지 Vol.54 No.3
Purpose: To investigate the clinical effect of micro-multiporous e-PTFE insertion for severe recurrent pterygium with symblepharon. Methods: The present study included a total of 13 cases of recurrent pterygium associated with symblepharon, motility restriction and diplopia which had undergone micro-multiporous e-PTFE insertion after pterygium excision, 0.02% mitomycin C application, human amniotic membrane transplantation (AMT) and/or conjunctivo-limbal autograft (CLAU) between September 2010 and February 2011. One month after surgery, the inserted e-PTFE was removed. Recurrence of pterygium and symblepharon, motility restriction, diplopia and injection of ocular surface were evaluated for 11.92 ± 1.32 months of mean follow-up period. Results: Pterygial recurrence was not observed in 12 out of 13 eyes, and the 1 eye which recurred showed conjunctival recurrence. No postoperative symblepharon recurrence was observed in any of the 13 eyes. Diplopia and motility restriction disappeared in 11 out of 13 eyes, and were improved in the other 2 eyes. VAS (Visual Analogue Scale) injection scores in the wound site decreased after surgery in all patients. Conclusions: Micro-multiporous e-PTFE insertion combined with mitomycin C application, AMT and CLAU can be a useful surgical method to lower the postoperative recurrence rate and to improve the pterygium-related symptoms in severe recurrent pterygium.