http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
정정호(Jeong, Jeong Ho),김정욱(Kim, Jeong Uk),정재군(Jeong, Jae Gun) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.3
Field measurement method of heavy/soft impact sound pressure level which is regulated in JIS and ISO has been using in Korea, Japan and Canada. It is reported that heavy/soft impact sound pressure level was varied by the sound field condition of receiving room such as sound absorption power and room volume. In this study, it is checked that heavy/soft impact sound pressure level was affected by the receiving sound field condition. Rubber ball and bang machine sound pressure level was measured in the vertically connected reverberation chamber. In oder to check the effect of receiving sound field on heavy/soft impact sound pressure, sound absorption power was changed with polyester sound absorption blankets with air space and glass wool. The reverberation time at 1 kHz band was changed from 10 s to 0.2 s by sound absorption material. Rubber ball sound pressure level measured without sound absorption material was 58 dB in $L_{i,Fmax,AW}$, but the level was 46 dB with sound absorption treatment. From this result, it is confirmed that sound field correction method is needed in the heavy/soft impact sound pressure level measurement method using bang machine and rubber ball.
무기질 단열재를 사용한 샌드위치패널의 단열 및 차음성능
정정호(Jeong-Ho Jeong),김정욱(Jeong-Uk Kim),정재군(Jae-Gun Jeong) 한국생활환경학회 2006 한국생활환경학회지 Vol.13 No.4
Movable floor plan apartment have a lot of merits and the number of apartments and buildings with movable floor is increasing. In order to achieve movable floor plan, light weight movable wall system with high thermal and sound insulation performance should be developed and applied. Sandwich panel system is light weight and easy to install but increment of thermal and sound insulation performance of sandwich panel is needed. In this study, inorganic thermal insulation material was applied as a core material of sandwich panel. Physical properties such as density, thermal conductivity and absorption coefficient of inorganic material, EPS, urethane and glass wool were tested. Also, a coefficient of overall heat transmission and sound reduction index of sandwich panels were tested. Inorganic material was lighter than other core material and has relatively higher absorption coefficient in mid and low frequency band. Thermal conductivity of inorganic material was lower than EPS, glass-wool. Sound reduction indices (Rw) of inorganic panel were higher than those of other experimented panels. In conclusion thermal and sound insulation performance of inorganic sandwich panel has enough for using various supplies including light-weight wall system of apartment.
정정호(Jeong, Jeong-Ho),김정욱(Kim, Jeong-Uk),정재군(Jeong, Jae-Gun),조병욱(Cho, Byung-Wook) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.2
Nowadays membrane material is widely used for large indoor spaces and long spaces such as traditional market. Thermal insulation and sound field control performance is considered as a main properties for design of such buildings. In this paper sound absorption and thermal insulation properties of membrane material was investigated. Firstly, normal incidence sound absorption coefficient of 10 kinds of glass wool textiles showed that sound absorption coefficient was increased in proportion of thickness and surface density of textile. Sound absorption coefficient of 4 kinds of sound absorptive inner membrane with outer membrane was tested in the reverberation chamber. Sound absorption coefficient of mid frequency range was about 0.4 ~ 0.6. Also, sound absorption coefficient was changed by the air space behind the membrane material. Secondly, sound field control performance was investigated using mock-up space. By the installation of sound absorption membrane material, reverberation time was decreased and speech intelligibility was increased. Finally, thermal resistance and room temperature in two kinds of mock-up rooms were tested, simultaneously. Results of thermal properties showed thermal insulation properties ware increased by adding inner membrane material underneath the outer membrane.