http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
구조물의 해체 공정별 오염농도 변화 및 비점오염원 관리 방안
주경훈 ( Kyoung Hoon Chu ),유성수 ( Sung Soo Yoo ),김효진 ( Hyo Jin Kim ),이경희 ( Kyoung Hee Lee ),고광백 ( Kwang Baik Ko ) 대한화약발파공학회 2011 화약발파 Vol.29 No.1
본 연구는 실제 발파해체가 진행된 현장을 대상으로, 해체공정 중 천공과 발파작업시 발생하는 수질 및 토양오염의 농도변화를 통해 환경오염 정도를 조사하였고, 시간 경과에 따른 오염물질의 거동특성을 파악하여 해체현장에서의 비점오염원 관리방안의 필요성을 제시하였다. 그 결과 천공과 발파작업 이후 수질 및 토양의 pH는 콘크리트의 수산화칼슘에 의해 8.5~9.3으로 기준치를 초과하였다. 천공과 발파작업으로 인한 중금속의 농도는 대부분이 기준치 이내였으며, 수질과 토양오염에 크게 영향을 미치지 않는 것으로 판단되었다. 하지만 천공과 발파작업 전후의 오염물에 대한 증감률을 통해, 중금속 중 Cr, Cu, Zn 및 Hg의 농도가 증가된 것을 확인하였으며, 발생된 오염물의 처리방안이 필요하다고 판단되었다. 해체현장에서 시간의 경과와 우기에 따른 오염물질의 농도는 대부분 감소하는 경향을 보였으며, 이는 발생된 오염물질이 비점오염원으로 주변 환경에 영향을 줄 것으로 보인다. In this study, the pollutants contained in water and soil samples taken from the explosive demolition site were examined to investigate the effects on environment, and management plan of non-point source pollution in the demolition site was suggested through characterizing the movement of the pollutant with time. As results, pH value of the water and soil samples after the demolition work was 8.5~9.3 which exceeds the Korean environmental criterion of water and soil range due to calcium hydroxide compounds in the concrete. The concentration level of heavy metals caused by the explosive demolition doesn`t exceed the environmental criterion of water and soil doesn`t exceed the environmental criterion of water and soil quality, and the influence of water and soil pollution on the environment was not considered. The concentration of the heavy metals was analyzed and that of Cr, Cu, Zn and Hg among the heavy metals increased after the drilling and explosive demolition. This says that concentration of the heavy metals during explosive demolition works needs to be monitored. The most pollutants with time or rain dilution into the demolition site decreased and this means that the pollutants caused by the explosive demolition might have influenced to vicinity of the demolition sites as non-point pollution.
Transfer characteristics of vehicle air conditioners’ booming noise
임성택,주경훈,Hew Nam Ahn,박영덕,강연준 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.6
Vehicle air conditioners generate a booming noise when pressure pulsation in the compressor is generated and transmitted to vehicleinteriors through the attached pipes and chassis, which constitute a typical noise transfer path between the compressor and the interior. Inthis study, the transfer path analysis and operational deflection shape methods were employed for analyzing the characteristics of noisetransfer paths, and acoustic intensity was measured through empirical experiments for analyzing the characteristics of the response system. The rigid body mode of the double pipe influences the dynamic behaviors of the liquid pipe, which is the major noise contributionpath. The force exerted on the liquid pipe generates not only structure-borne noise but also air-borne noise in a heating, ventilation andair-conditioning system. An experiment was carried out to reduce such noise by distributing the high noise contribution to the low one. Through this experiment, we propose a path coupling method for noise reduction that modifies the contribution of each transfer pathfrom the source to the receiver.
폴리에틸렌 하수관 연결용 전기발포융착 이음관에 관한 연구
계형산,주경훈 대한상하수도학회 2012 상하수도학회지 Vol.26 No.3
A electro-foaming fusion wrap fitting for polyethylene sewer pipe was built and foaming mechanism has been studied. A foaming sheet, supporting sheet and clamping band is assembled into a all-in-one structured electro-foaming fusion wrap fitting. To specify foaming and fusion of electro-foaming fusion wrap for PE sewer pipe, series of fusion tests were performed in various conditions. A parallel plate compression test up to 50 % of inner diameter deflection has been performed to check integrity of fusion quality and it was found that there were no visible signs of crack in wrapped area of fitting. Also air tightness test based on KS M 3511-2 has been performed to evaluate perfectness of wrap fusion quality and we found there were no pressure drop up to 10 times higher value than KS standard regulation.