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이기륭(Ki-Ryung Lee),김명준(Myung-Jun Kim),염성곤(Sung-Kon Yum) 한국생활환경학회 2011 한국생활환경학회지 Vol.18 No.5
The purpose of this work is to investigate and analyze the influence of traffic volume and vehicle speed on the sound level (the equivalent continuos A-weighted sound pressure level) at a roadside. Six roads with various types such as urban freeway national highway urban road and expressway were selected for measurements. The traffic conditions of domestic vehicles and the traffic noise were measured simultaneously by using the Smart-sensor with built-in dual radars and the precision sound level meters respectively. 2,580 raw data including the traffic conditions and the sound level were collected. On the basis of these data not only the characteristics of each traffic condition but the relationships between each traffic condition and the sound level were analyzed in detail. The result showed that the growth in sound level was considerable with increasing the traffic volumes in range of less than about 2,000 veh/hr. In addition as the vehicle speed is closely related to the traffic volume the sound level was affected by both traffic conditions at the same time.
루버형 소음기 형상에 따른 삽입손실 특성에 관한 실험적 고찰
이태호(Tae-Ho Lee),이기륭(Ki-Ryung Lee),조정식(Jung-Sik Cho),안용찬(Yong-Chan Ann),김정인(Jung-In Kim) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
Standard of living of latest people is improved and reaction about noise also became sensitive. Accordingly, examined Life noise regulation standard and Factory noise effluent quality standard in Noise and Vibration Control Act of the Ministry of Environment. Noise emitted to outdoors by jumbo and vast quantity anger of factory, industrial facilities and building was increased too. There is air conditioning equipment, each variety equipment ventilating openings, inlet or outlet of generator soundproofing box, cooling tower representatively. In this way, noise reduction countermeasure establishment about airborne sound that is produced is required. The Splitter style silencer and acoustic louver week for noise reduction of HVAC duct and ventilating openings. In this paper, experimented at reverberation chamber on KS ISO 7235 and ASTM E447. Evaluated comparison experimenting insertion loss and perssure loss by length and inside shape of Acoustic Louver. Execute regression analysis using experiment result and forecasted insertion loss of various length condition. Therefore, I wish to use to basic data so that can apply optimized acoustic louver after expect noise reduction amount by length or type of acoustic louver.
이태호(Tae-Ho Lee),안용찬(Yong-Chan Ann),조정식(Jung-Sik Cho),이기륭(Ki-Ryung Lee) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
지하철 인근 지역에서 차량 통과 시 차륜과 레일의 상호작용으로 인한 진동이 지반을 통하여 건물까지 전파되어 구조전달음이 발생하게 된다. 이러한 구조전달음이 발생하는 지하철 인근 지역에서 도로나 주거단지가 새롭게 조성될 예정인 경우, 완공 이후에 발생하는 구조전달음 영향을 사전에 평가하고 대책을 수립하는 것이 요구된다. 본 논문에서는 국내에 위치한 일부 역사에서의 구조전달음을 측정하고 국외의 예측식을 검토하여 구조전달음의 실측치와 예측치를 비교한다. 따라서 국내 지하철의 구조전달음 예측에 대하여 국외 예측식의 타당성을 검토함으로써 향후 건설될 지하구간 역사의 인근 주거지역에 대한 구조전달음을 예측하는데 기초 자료로 활용하고자 한다.
송준원(Jun-Won Song),강일경(Il-Kyung Kang),김태희(Tae-Hee Kim),이기륭(Ki-Ryung Lee),신용섭(Yong-Sup Shin) 한국생활환경학회 2005 한국생활환경학회지 Vol.12 No.1
On trend of ‘wellbeing’, installation of large gas range hood has taken place in recent times in the domestic super high-rise & high-quality apartments to improve the life quality in Korea. Due to the lack of sufficient information on the performance level of these hoods, however, the construction industry is forced to rely on each supplier’s simple catalogue. But most of these suppliers can not afford any independent performance testing of their own products, resulting a credibility problem. At the same time, due to the height and pressure difference between the upper-level floor and the ground level, occurrences of significant foul ordure have been reported because of the back flow of its ventilation circulation from vertical duct, resulting a lower quality of life of the tenants. So residents claim for the bad indoor quality, asserting all responsibility are belong to construction company. To solve this situation, first of all, to know and test the hoods sold in market thoroughly, especially performance, may be the first step and critical. Purpose of this research is to acquire the method to select the optimal gas range hood through the performance test under KS or prEN codes, such as performance curve, noise level, capture efficiency and power consumption and the reasonable grounds to adapt the optimal one to our construction fields. After research, to bestow weigh function on noise level is considered more important item than any others. Additionally, the comparison general hoods and functional hoods was accomplished under economical efficiency.