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지중 내 TPH, Phenol의 확산방지를 위한 선택적 차수재 제조에 관한 연구
임호진,조우리,오승진,김수희,이재영,HoJin Lim,WooRi Cho,SeungJin Oh,SuHee Kim,JaiYoung Lee 한국지반신소재학회 2024 한국지반신소재학회 논문집 Vol.23 No.1
In this study, a selecvively block barrier was developed to prevent the spread of contaminants (TPH, Phenol) in the ground only when contamination occurs. The materials were used Jumunjin sand, bentonite, polyolefin elastomer and spill hound marine. First, the properties and environmental hazards characteristics of materials were analyzed for evaluated their usability. Then, the possibility of use as a barrier material was confirmed by analyzing the water permeability characteristics that change after 24 hours of contact with contaminants. As a result of the analysis, the pH of each component was similar to the general groundwater pH range. In addition, the toxicity characteristics and the possibility of dissolution of hazardous substances, it was determined that there was no environmental hazard as the content was below the regulation value. Lastly, when comparing the permeability coefficient before and after contact with the contaminant, the permeability coefficient of approximately α × 10<sup>-3</sup>cm/sec before contact was reduced to α × 10<sup>-6</sup>cm/sec after contact with the contaminant.
Binge Drinking and Its Relation to Metabolic Syndrome in Korean Adult Men
임호진,박상민,최정환,최은주 대한가정의학회 2014 Korean Journal of Family Medicine Vol.35 No.4
Background: It is reported that heavy drinking increases the risk of metabolic syndrome. But there have been few studies on the relationship between the intensity of drinking and metabolic syndrome when drinking the same amount of alcohol. This study aimed to assess the relationship between the frequency of binge drinking and metabolic syndrome in Korean adult men.Methods: From the database of the 4th and 5th Korea National Health and Nutrition Examination Survey conducted in 2007–2010, data of 8,305 adult men (≥19 years of age) was included in this analysis. Cross-sectional relationship between the frequency of binge drinking and metabolic syndrome was investigated adjusting for pure alcohol consumed per day.Results: Adjusting for various confounders including pure alcohol consumed per day, the adjusted odds ratio for metabolic syndrome in those in higher frequency (more than 1/wk) binge drinking group was 1.62 (95% confidence interval, 1.30 to 2.03; P for trend = <0.001) compared to those in the non-binge drinking group. Through analysis of the relationship between pure alcohol consumed per day and metabolic syndrome, it was found that pure alcohol consumed per day had a positive relation to metabolic syndrome in the higher frequency binge drinking group (P for trend = 0.041). The relationship was inverse in the non-binge drinking group (P for trend = 0.002).Conclusion: Our study found a positive relationship between frequency of binge drinking and metabolic syndrome in adult men. And the effect of drinking on metabolic syndrome may depend on the frequency of binge drinking. Further studies are required to confirm this association.
임호진,Zaeem Bin Babar,박준현,Fawad Ashraf,Ahsan Ali 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
반응성 유기화합물은 대기 중 광화학반응을 통해 기후변화 및 대기질에 큰 영향을 주는 것으로 알려진 이차 유기에어로졸(secondary organic aerosol : SOA)을 생성한다. 지난 수십 년 동안 SOA의 생성과 환경영향에 대한 이해를 증진하기 위한 다양한 연구가 발전적으로 수행되고 있다. SOA 생성 메커니즘, 화학조성, 물리화학적 특성, 위해성 등 다양한 측면의 연구들이 지속적으로 진행되고 있다. 본 연구는 SOA 생성 연구를 위한 실내 스모그 챔버 및 흐름반응기의 제작과 특성평가에 대한 것이다. 실내(3.9 m × 3.3 m× 2.8 m)에 FEP 백(~8 m³), 자외선 형광등(72개), 공기청정장치 등으로 구성된 스모그챔버를 개발하였다. SOA 생성과 측정을 위하여 FEP 백에 반응물 주입장치와 각종 입자 및 가스 측정기를 연결하였다. 에어컨과 라디에이터를 이용하여 스모그챔버의 온도를 조절할 수 있게 하였다. 스모그챔버의 특성을 평가하기 위하여 온도 및 습도 조절, 가스 및 입자 벽손실, 광원발광스펙트럼, NO₂ 광분해, 청정공기 반응성 등을 측정하였다. 한편 크기가 작고 이동성이 좋고 사용이 용이한 흐름반응기를 개발하였다. 사각 실린더(30 cm × 30 cm × 80 cm)에 FEP와 석영 재질의 원통 실린더(내경 ~15 cm × 70 cm)와 자외선 램프(4개)를 설치한 흐름반응기를 제작하였다. 실린더 내부는 밀폐되어 있고, 온도 조절을 위해 열전소자 냉각기가 장착되었다. 원통 실린더 양 측면에 깔대기 모양의 연결부에 반응물 주입장치와 생성물 측정장치가 각각 연결되어 있다. 흐름반응기의 온도/습도 조절, 가스 흐름분포, OH 라디칼 생성 특성, SOA 생성 등을 평가하였다.
Investigation of Secondary Aerosol Formation in Agricultural Area Using a Flow Reactor
임호진,Fawad Ashraf,박준현,Ahsan Ali 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
Atmospheric ammonia (NH₃) is considered an important precursor of PM2.5. The primary sources of ammonia are livestock husbandries and synthetic fertilizers for agriculture. In this study, a new oxidation flow reactor (KNU-OFR) with NO₃ radical generator was deployed in the vicinity of livestock husbandries (for a summer and winter season) and an agricultural site (for a summer season). The ambient and aged PM2.5 and gases (NOx, CO, SO₂, O₃, NH₃) were measured throughout the campaign. The ambient precursor was aged to 0.5, 1.0, 2.0 and 3.0 d in OFR under the reaction of OH and NO₃ radical for day and night time, respectively. It followed by the characterization of secondary aerosol composition using an Aerodyne TOF-ACSM. Ambient PM2.5 and gases were measured in 0-10 and 30-40 minutes of each hour. Four aging steps were carried out in the remaining time periods of each hour, i.e. 10 min slot for each step. Day and night time reaction periods were 05:00 to 20:00 and 08:00 to 18:00 o’clock for summer and winter, respectively. Ambient PM2.5 composition was dominated in order of nitrate > organic matter > ammonium > sulfate. Secondary aerosol consisted of a much higher fraction of nitrate and ammonium followed by organic matter and sulfate. The diurnal pattern of NH₃ showed a high flux of NH₃ in late night and late evening for both seasons. The preliminary results showed a prominent effect of NH₃ when primary aerosol was aged in a high flux of NH₃ and NOx.