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필터 종류에 따른 호흡성 분진 농도 분석의 정전기 영향
홍가연 ( Ga Yeon Hong ),김진아 ( Jin A Kim ),우병열 ( Byung Lyul Woo ),김동건 ( Dong Keon Kim ),양원호 ( Won Ho Yang ) 대구가톨릭대학교 자연과학연구소 2011 자연과학연구논문집 Vol.9 No.1
Quality assurance for fine particle requires conditioning of filters at 20∼23℃ and 30∼40% relative humidity for 24hr prior to gravimetric analysis. The reason for these requirements is that the accuracy or reliability of filter weighting is associated with and can be affected by several factors including temperature, humidity, light, draft, and electrostatic charge. In this study, concentration of respirable suspended particulate by gravimetric method was measured in smoking room by three kinds of filters (PVC, MCE and PTFE) to quantify the effect of electrostatic charge. Among the filters, MCE filter was statistically affected by electrostatic charge (p= 0.002).
양원호,홍가연,김근배,Yang, Won-Ho,Hong, Ga-Yeon,Kim, Geun-Bae 한국환경보건학회 2012 한국환경보건학회지 Vol.38 No.3
Objectives: Controversy regarding the relationship between exposure to Agent Orange and disease has progressed for more than four decades, both at home and abroad. Recently, the allegation by US veteran Steve House of the burial of Agent Orange at the US Army base Camp Carroll located in Waegwan-eup, Korea, has emerged. We reviewed published articles and reports related to Agent Orange. Methods: Articles and reports were collected online using the keywords 'agent orange' and 'health' and then reviewed. Results: A number of epidemiologic studies have reported disease outcomes due to exposure to Agent Orange, while others were unable to establish a link to the injuries of veterans of the Vietnam War. This can be explained by the fact that accurate exposure assessment should be carried out since exposure misclassification in epidemiologic studies can affect estimates of risk. In the case of the burial of Agent Orange at Camp Carroll, an exposure pathway could be through underground water supplies, which differs from the cases of Vietnam and Seveso in Italy. Conclusion: There still remains a dispute among academics regarding the relationship between exposure to Agent Orange and disease, although Agent Orange is a highly toxic chemical. This dispute indicates that accurate exposure pathway and exposure assessment is needed.
노출 시나리오를 이용한 대학생들의 유해 공기오염물질 노출 추정
김순신 ( Sun Shin Kim ),홍가연 ( Ga Yeon Hong ),김동건 ( Dong Keon Kim ),김성삼 ( Sung Sam Kim ),양원호 ( Won Ho Yang ) 한국환경과학회 2013 한국환경과학회지 Vol.22 No.1
Studies evaluating the health effects of hazardous air pollutants assume that people`s exposure to typical pollutant level is the same as specific regional pollutant level. However, depending on social and demographic factors, time-activity pattern of people can vary widely. Since most people live in indoor environments over 88% of the day, evaluating exposure to hazardous air pollutants is hard to characterize. Objective of this study was to estimate the exposure levels of university students of NO2, VOCs(BTEX) and PM10 using the scenarios with time-activity pattern and indoor concentrations. Using data from time-use survey of National Statistical Office in 2009, we investigated time-activity pattern of university students and hourly major action. A total of 1,057 university students on weekday and 640 on weekend spent their times at indoor house 13.04 hr(54.32%), other indoors 7.70 hr(32.06%), and transportation 2.36 hr(9.83%). Indoor environments in which university students spent their times were mainly house and school. Air pollutants concentrations of other indoor environments except house and school such as bar, internet cafe and billiard hall were higher than outdoors, indicating that indoor to outdoor ratios were above 1. According to three types of exposure scenarios, exposure to air pollutants could be reduced by going home after school.
계절에 따른 사무실 근로자의 이산화질소 노출에 대한 직장 및 주택실내 기여도
양원호 ( Won Ho Yang ),김동건 ( Dong Keon Kim ),홍가연 ( Ga Yeon Hong ),김순신 ( Sun Shin Kim ),안호기 ( Ho Gi Ahn ) 한국산업위생학회 2012 한국산업보건학회지 Vol.22 No.2
People are exposed to air pollution from a range of indoor and outdoor sources. Concentration of nitrogen dioxide (NO2), which is hazardous to health, can be significant in both types of environment. This paper reports on the measurement and analysis of indoor and outdoor NO2 concentrations and their comparison with measured personal exposure in house and workplace indoors with 28 office workers during winter and summer seasons. Time activity patterns were used to determine the effects of these factors on personal exposure. The residential indoor and office indoor times were 12.29±1.58, 7.86±1.97 hours in winter and 11.04±2.18, 8.26±2.04 hours in summer, respectively. Measured residential indoor, outdoor and office indoor, personal exposure NO2 concentrations were 23.10±8.46 ppb, 23.97±6.86 ppb, 21.91±11.50 ppb, 22.08±8.64 ppb in winter, and 19.94±6.04 ppb, 21.21±6.84± ppb, 22.55±9.54 ppb, 27.45±8.96 ppb in summer, respectively. Contributions of residential and office indoor NO2 concentration on personal exposure were estimated by 57.98%, 35.62% in winter and 37.38%, 28.97% in summer, respectively.
김동건 ( Dong Keon Kim ),김명수 ( Myeong Su Kim ),김순신 ( Sun Shin Kim ),홍가연 ( Ga Yeon Hong ),이석용 ( Seok Yong Lee ),양원호 ( Won Ho Yang ) 대구가톨릭대학교 자연과학연구소 2012 자연과학연구논문집 Vol.10 No.1
This study progressed to survey formaldehyde(HCHO) concentration at using passive sample and active sampler in New building. We selected places such as department office, lecture room, professor`s room, studio room, and hallway. The highest average concentration of formaldehyde was 544.13 ug/m3 at active sampler in studio room. Whereas lowest average concentration of formaldehyde was 4.91 ug/m3 at active sampler in hall way. Specially the fact of the studio room was more than 8 times on the baseline, concentration of the remaining places are above the baseline. According to analysis new building which was built should need to improvement in indoor air quality.
박혜림 ( Hye Lim Park ),이선애 ( Seon Ae Lee ),김순신 ( Sun Shin Kim ),김동건 ( Dong Keon Kim ),홍가연 ( Ga Yeon Hong ),양원호 ( Won Ho Yang ),이식용 ( Seok Yong Lee ) 대구가톨릭대학교 자연과학연구소 2012 자연과학연구논문집 Vol.10 No.1
It`s the purpose that the status and trends of industrial accidents, the types of industrial accidents to foreign worker based on research papers and compare foreign case with domestic case to the object of the future how should we go to the better way. Key words by this papers. Searching on the online by, `foreign workers, industrial accidents, industrial trainees and Employment Permit System (EPS)` to collect and review research papers. Some of the papers are researching by the status and trends of industrial accidents, and other papers researching by compensation by industrial accidents and a way out legal action by increasing number of illegal aliens but many researches are insufficient for solution by reducing number of illegal stays and industrial accidents. It`s the trends that increasing industrial accidents of foreign workers much higher than korean workers. whereas many studies which had not been made. There are necessary to do researching on ways to reduce industrial accidents for foreign workers.
신축 건물의 포름알데히드 노출에 의한 농도평가 및 재실자의 인식도조사
김동건 ( Dong Keon Kim ),이혜민 ( Hye Min Lee ),박제언 ( Jee On Park ),김민주 ( Min Joo Kim ),이선영 ( Sun Young Lee ),홍가연 ( Ga Yeon Hong ),우병렬 ( Byung Lyul Woo ),양원호 ( Won Ho Yang ) 대구가톨릭대학교 자연과학연구소 2011 자연과학연구논문집 Vol.9 No.1
This study progressed to survey formaldehyde (HCHO) concentration at using passive sample for 5 days and active sampler for 1 hr in new building. We selected places such as department office, lecture room, professor`s room, studio room, and hallway. The highest average concentration of HCHO was 544.13 ㎍/m3 at active sampler in studio room. Whereas lowest average concentration of formaldehyde was 4.91 ㎍/m3 at active sampler in hall way. Specially HCHO concentration of the studio room was more than 8 times on the indoor air quality standard, and concentration of the remaining places are above the standard. These results can be explained that indoor air quality of new building should be improved by installing the air cleaning device and ventilation system.