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솨이지엔페이 ( Jianfei Shuai ),양원호 ( Won Ho Yang ) 대구가톨릭대학교 자연과학연구소 2010 자연과학연구논문집 Vol.8 No.1
Nitrogen dioxide (NO2) has been demonstrated to produce many adverse health effects on human. NO2, as important air pollution, has received more and more considerable attention in recent years. The purpose of this study was to investigate NO2 exposure levels in roadside restaurants. This study used multiple measurement method to investigated indoor and outdoor NO2 concentrations. The mass balance model was used to estimate the indoor and outdoor contributions to indoor NO2 concentrations. Indoor NO2 concentrations in restaurant 3 exceeded the Korean Environment Standards, and indoor NO2 concentrations in all restaurants exceeded the Korean Indoor Air Quality Standards in spring. Indoor NO2 concentrations in restaurant 3 only exceeded the Korean Indoor Air Quality Standards in summer. The I/O ratios of restaurants were all higher than 1 both in spring and summer. And the indoor contributions in all restaurants also were dominant in indoor NO2 concentrations both in spring and summer.
윤효정,솨이지엔페이,김탁수,서정관,정다영,류현수,양원호 한국냄새환경학회 2017 실내환경 및 냄새 학회지 Vol.16 No.2
Information about time spent in microenvironments plays a critical role in exposure assessment of the person concerned, considering that personal exposure relies on the characterization of time-activity patterns of the population at risk as human activities impact the timing, location, and level of personal pollutant exposure. The purpose of this paper was to present the time-activity patterns of Korean adults from a population-based study, and to determine the time spent each day in microenvironments. The population-based study collected time-activity data of about 46,000 adults for two consecutive days on weekdays (n=28,152) and weekends (n=18,800). The mean times spent at one’s own house, workplace or school, other’s house house, restaurant or bar, other places, and transportation related to the whole sample of 28,152 people were 14.90 hrs (62.08%), 4.28 hrs (17.81%), 0.24 hrs (1.01%), 0.51 hrs (2.14%), 2.45 hrs (10.21%), and 1.62 hrs (6.74%) on weekdays, respectively. Looking at the total time spent indoors by adults in different countries, the following four countries were ranked as follows, from lowest to highest: USA > Canada > Korea > Hong Kong. Due to cultural, socioeconomic and climatic differences, it may not be appropriate to directly apply statistical data of other countries to the Korean situation. This paper provides information on how the proportion of persons in different locations changes by time of day, on weekdays and weekends. Here, we can see that over 90% of respondents were in a residence from about 11 PM to 5 AM, and the largest proportion of respondents in workplaces or schools and other places is found between 8 AM and 5 PM.
이현수 ( Hyun Soo Lee ),권은경 ( Eun Kyung Kwon ),솨이지엔페이 ( Shuai Jianfei ),우병렬 ( Byung Lyul Woo ),양원호 ( Won Ho Yang ) 대구가톨릭대학교 자연과학연구소 2009 자연과학연구논문집 Vol.7 No.1
Indoor air quality can be affected by indoor sources, ventilation, decay and outdoor levels. Although technologies exist to measure these factors, direct measurements are often difficult. Toluene and nitrogen dioxide (NO2) concentrations of residential indoor and outdoor were simultaneously measured and compared in 16 houses, using passive samplers during every 3 days for 60 days. Using a mass balance model and regression analysis, penetration factor (ventilation rate divided by sum of ventilation rate and deposition constant) and source generation factor (source generation rate divided by sum of ventilation rate and deposition constant) were calculated by multiple indoor and outdoor measurements. The mean concentrations of toluene of indoor and outdoor on residential indoor air quality were estimated to be 38.6±31.9ppb and 38.4±31.0ppb, respectively. On the other hand, mean concentration of NO2 were 22.08±6.96ppb and 26.71±7.04ppb, respectively. These results could be explained that concentration of indoor and outdoor air pollutants sources to residential indoor air concentrations are different. In conclusion, concentration of outdoor air and indoor sources affecting indoor air quality were effectively characterized using multiple indoor and outdoor measurements.
도로변 상점 실내,외의 이산화질소 농도 및 거리에 따른 이산화질소 감소
권은경 ( Eun Kyung Kwon ),이현수 ( Hyun Soo Lee ),솨이지엔페이 ( Shuai Jianfei ),우병렬 ( Byung Lyul Woo ),양원호 ( Won Ho Yang ) 대구가톨릭대학교 자연과학연구소 2009 자연과학연구논문집 Vol.7 No.1
Workers who work at indoor and outdoor environmant near busy road are suspected to be exposed to high-elevated air pollutant levels during working hour. This study evaluated the working-time nitrogen dioxide (NO2) exposure for workers of store. In this study, we measured the indoor and outdoor NO2 concentrations of store. High NO2 exposure for workers of store was considered to be inflow of outdoor source of exhausted emission from vehicles and indoor source from usage of gas range. Indoor/Outdoor NO2 concentration ratio (0.99± 2.19) in store. According to NO2 concentrations by distance from roadside to store, NO2 concentrations showed the decreased trend with distance. The results of this study can be utilized by municipal authorities in urban planning for evaluating effects of future traffic planning and land use.
최민지 ( Min-ji Choi ),박지영 ( Ji-young Park ),임미영 ( Mi-young Lim ),솨이지엔페이 ( Jianfei Shuai ),허정 ( Jung Heo ),정다영 ( Da-young Jung ),류현수 ( Hyeon-su Ryu ),오나래 ( Na-rae Oh ),김순신 ( Sun-shin Kim ),양원호 ( Won-ho Y 한국치위생학회(구 한국치위생교육학회) 2017 한국치위생학회지 Vol.17 No.1
Objectives: This study was conducted to suggest the necessity of education about toothpaste usage to infants, preschoolers, and their parents. Also, another purpose is to provide basic data that is necessary for oral health education about accurate cognition and usage of toothpaste. Methods: From October to December 2015, we conducted a survey on parents of 0~4 years old infants and preschoolers about toothpaste usage based on the data of a questionnaire with a total of 505 subjects. The survey questions were composed of general characteristics of infants, preschoolers and their parents, and toothpaste usage. Results: Usage frequency of toothpaste for infants and preschoolers increased with age (p<0.001), and infants and preschoolers in homes with monthly income under 4 million won showed high frequency of toothpaste usage (p<0.001). Toothpaste mouth rinsing of infants and preschoolers increased with age (p<0.001), while on the other hand, toothpaste swallowing decreased (p<0.001). Conclusions: In this study, it was shown that the factors that effect toothpaste usage in infants and preschoolers were age and average monthly income of the family. This suggests the necessity of oral health education to parents about usage of toothpaste in infants and preschoolers.
우병렬 ( Byung Lyul Woo ),이현수 ( Hyun Su Lee ),솨이지엔페이 ( Shuai Jianfei ),김동건 ( Dong Gun Kim ),양원호 ( Won Ho Yang ) 대구가톨릭대학교 자연과학연구소 2010 자연과학연구논문집 Vol.8 No.1
In this study, we investigated the indoor concentrations of formaldehyde in buildings nearby university. We selected seven buildings such as laboratory, library, laundry, restaurant, billiard, single room, and internet cafe. The highest indoor concentration of formaldehyde was 68.51㎍/㎥ in laboratory. Whereas lowest indoor concentration of formaldehyde was 11㎍/㎥ in laundry. Every buildings are not exceed the Korean indoor standard regulated by government. Indoor/outdoor ratio was more than 1 except laundry.
이현수 ( Hyun Soo Lee ),김동건 ( Dong Gun Kim ),솨이지엔페이 ( Shuai Jianfei ),우병렬 ( Byung Lyul Woo ),양원호 ( Won Ho Yang ) 대구가톨릭대학교 자연과학연구소 2010 자연과학연구논문집 Vol.8 No.1
Personal exposures of nitrogen dioxide(NO2) were studied in a population of university students. In this study, dily personal NO2 concentrations of 37 university students were measured and comparison of measured NO2 level(ppb) of university students and housewives. The close association between measured indoor NO2 concentrations and measured personal exposure and contribution of indoor NO2 concentration suggests that measuring indoor concentrations of NO2 in the home is sufficient to estimate personal exposure accurately.
산업단지 및 일반생활 지역의 공기 중 톨루엔에 대한 개인노출 및 생체시료의 상관성 분석
이병준(Byoungjun Lee),허 정(Jung Heo),정다영(Dayoung Jung),김순신(Sunshin Kim),류현수(Hyeon-Su Ryu),최민지(Min-Ji Choi),솨이지엔페이(Jian-Fei Shuai),임성국(Sung-Guk Im),양원호(Wonho Yang) 한국환경보건학회 2017 한국환경보건학회지 Vol.43 No.4
Objectives: The purpose of this study was to assess the correlation relationship between personal exposure and urinary hippuric acid in biological monitoring for airborne toluene in an industrial complex and in general environments. Methods: Personal exposure to toluene and its metabolite, hippuric acid, in urine were simultaneously measured in occupational environments area near an industrial complex and in general environments. The study subjects were divided into three types: 137 workers who use organic solvents in the workplace, 210 residents living near a dyeing industrial complex, and 379 residents living in general environments. The toluene exposures of workers and residents were measured by a passive sampler for four days. The urine of participants was sampled when the passive samplers of personal exposure were collected. Results: The toluene and hippuric acid concentrations of workers were the highest, followed by the concentrations of residents living near a dyeing industrial complex and residents living in general environments. The coefficient of correlation between the concentrations of toluene and hippuric acid among workers was 0.749 (p<0.01) in the workplace. On the contrary, correlations between the concentrations of toluene and hippuric acid among residents living near a dyeing industrial complex and residents living in general environments were all not significant. The relationship between the concentrations of hippuric acid and toluene in three types could be described by the exponential growth model. Conclusions: This study analyzed the relationships between toluene exposure and the concentrations of hippuric acid in urine in high, middle, and low exposure environments, and could be described by the exponential growth model.