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도영주,김동규,김흥식,Do, Young-Ju,Kim, Dong-Gyu,Kim, Heung-Sik 한국음향학회 1989 韓國音響學會誌 Vol.8 No.1
공조설비소음의 특성을 파악하기 위하여 서울의 도심에 위치한 고층 사무소 건물을 대상으로 송풍기의 파워레벨과 취출구를 통한 실내소음레벨을 측정하였다. 또한 공조설비소음이 문제시되는 건물에 흡음챔버와 사이드브랜치를 설치하여 소음기의 감음성능을 평가하였다. 연구의 결과, 실내소음레벨은 송풍기 발생소음의 영향으로 500Hz 이하의 저주파수 대역에서 ISO의 허용 기준치인 NR40을 초과하였으며 흠음챔버는 넓은 대역의 주파수, 사이드브랜치는 특정공명주파수에서 감음효과가 크게 나타났다. This study aims to provide the basic data useful in assessing indoor-noise and designing sound devices in office buildings of HVAC system. The measurements of HVAC noise were carried out in office room and mechanical room. The performance of absorptive chamber and side branch was also estimated in the office buildings which have HVAC noise problems. The results of experiments show that the NR value of indoor HVAC noise is rather higher than that of ISO recommendations at the frequencies below 500Hz. In addition, the results indicated that the absorptive chamber attenuates noise over broad band frequencies and side branch reduces noise at the special resonant frequency.
도영주 경북대학교 1996 慶北齒大論文集 Vol.13 No.-
The purposes of this study were to investigate the retention and caries prevention effectiveness of fissure sealant from 1993 to 1995 in 7-12 year old school children Kyungsan County, Korea. 223 Children who were consented by their parents were treated with light-cured sealant on the dental unit by one dentist. Status of DMFT, dental health capacity of permanent 1st molar, total retention, partial loss and total loss of sealant and carious and amalgam filled teeth after sealing were examined after 6 months, one,two and three years. Data analyses were conducted using the SPSS/PC^* program. Differences in before and after sealing were compared by the student t-test and chi-square test. Corresponding p-values were considered significant at values < 0.05. The obtained results were as follows: The total retention, partial loss and total loss of sealant were 88.0%, 9.7% and 2.3% respectively after 3 months and 62.9%^, 28.4% and 8% after 27 months. Caries preventive effect of sealant was 35% after 27 months. Caries prevalence after partial and total loss of the sealant body was 1.6% after 3 months and 5.2% after 27 months. The ratio of amalgam resoration appeared only 1.6% due to advanced dental caries. The results obtained suggest that continuing efforts should be made to reduce the percentage of children with experience of caries and should be extended as a major project of the community dental public health program in Korea.