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유재연 ( Ryoo Jae-youn ),정태섭 ( Jeong Tae-seop ),김혜영 ( Kim Hea-youn ) 한국환경기술학회 2000 한국환경기술학회지 Vol.1 No.3
본 연구에서는 전라북도 지방의 1999년 1월부터 8월말까지의 강수시에 시료를 채취하여, 강수의 이온성분에 대한 화학적 특성을 파악하고자 하였다. 강수 중의 주요 수용성 이온성분의 총 당량농도는 강수량과 역상관관계를 보이고 있으나, pH의 경우는 강수량에 관계없이 전체 평균 5.53으로 고른 폭의 값을 나타내고 있다. 또한 pH값에 따른 강수의 빈도를 보면 5.2에서 5.6까지의 빈도가 전체 강우수를 66.7%를 차지하고 있다. 강수 중에 존재하는 양이온의 함량은Ca<sup>2+</sup>>NH<sub>4</sub><sup>+</sup>>K<sup>+</sup>>Mg<sup>2+</sup>>H<sup>+</sup> 순으로 나타내고, 음이온의 함량은 SO<sub>4</sub><sup>2-</sup>>CI>NO<sub>3</sub>>F>NO<sub>2</sub> 순으로 나타났다. 이는 음이온의 경우 인위적인 화석연료 사용에 의한 영향이 많고, 양이온의 경우 자연적인 발생원의 영향이 많은 것으로 추정된다. 또한 해염입자의 의해 Na<sup>+</sup>와 CI의 함량이 높은 것으로 나타났다. 강수 중 해염성분의 기여율을 구한 결과, 해안에 접해있는 부안이 28.8%로 가장 많고, 그 다음으로 군산이 20.5%의 기여율을 보이고 있다. 이는 다른 내륙지역보다 더 많은 기여율을 나타내고 있다. 강수 중의 산성물질은 암모니아나 칼슘화합물에 의해 거의 97%정도가 중화되는 것으로 추정된다. 인위적인 발생원에서 유래한 황산염, 질산염, 염산염이 강수의 산성도에 기여하는 정도는 각각 0.647, 0.194, 0.159 황산염에 의한 기여율이 가장 높은 것으로 추정된다. In order to investigate the chemical characteristics of precipitation in Chonbuk, the Precipitation samples were collected by wet-only precipitation sampler from January to August 1999. And pH, major water-soluble ionic components were analyzed. The negative correlation was observed between the rainfall and the sum of major water-soluble ionic components in μ eq/L. The average concentration of volume weighted pH was found to be 5.53, and 66.7% of total rainfall were between pH 5.2 and 5.6 The cation abundance in Rainfall showed the general trend Ca<sup>2+</sup>>NH<sub>4</sub><sup>+</sup>>K<sup>+</sup>>Mg<sup>2+</sup>>H<sup>+</sup> and the general trend of Anion abundance showed SO<sub>4</sub><sup>2-</sup>>CI>NO<sub>3</sub>>F>NO<sub>2</sub>. The acidity of rainwater is neutralized up to 97% by ammonia and calcium species. And sulfate and nitrate that were originated by anthropogenic activity were found to contribute about 84% of precipitation acidity.
대기정체와 초미세먼지(PM<SUB>2.5</SUB>) 특성 연구
유재연(Jae-Youn Ryoo),권태혁(Tae-Hyeok Kwon),강인숙(In-Sook Kang),이광수(Kwang-Soo Lee),조창우(Chang-Wu Jo),김종신(Jong-Sin Kim),김현호(Hyun-Ho Kim),장욱(Wook Jang),박정제(Jeong-Jae Park),유택수(Taek-Soo Yoo) 환경독성보건학회 2019 한국독성학회 심포지움 및 학술발표회 Vol.2019 No.10
Air quality, meteorological parameters and terrain data were analyzed to understand the relationship among meteorological parameters, air stagnation and fine particulate matter(PM2.5) at Samcheon-dong in Jeollabuk-do Korea from January to December, 2017. We’d like to suggest the region of high possibility to be stagnant in our country. During the entire periods, the high concentrations of PM2.5 were found when the wind speed was lower than 1.8 m/s. The frequencies of the high concentration of PM2.5 in stagnant air mass were much less than long-range transport but the concentration of PM2.5 in stagnant was as high as that of long range transport. Furthermore, it is likely that atmospheric dispersion of two areas, which were both the height under 53 m and over 372 m, as well as over 1.8 m/s, would be very active due to the sea-land breeze and the strong wind on mountain area, respectively. Accordingly, it was considered that the areas of under 1.8 m/s were likely to be stagnant, especially the areas between the height of 53 m and 372 m had the potential to be stagnant severely.
유재연,정태섭 全北大學校 附設 都市및環境硏究所 2000 都市 및 環境硏究 Vol.15 No.1
This study was conducted to investigate the trajectory analysis and chemical characteristics of precipitation at Namwon, Imsil, Kunsan, Buan, Chonju and Changsu from the period between January and August 1999. Samples were analyzed for anions and cations. And in order to understand the characteristics of rainfall during observation, backward trajectory analysis was carried by using HYSPLIT_4(Hybrid Single-Particle Lagrangian Integrated Trajectory) model(Version 4) and factor analysis was conducted from each sources. It showed the major source of pollutants in precipitation were from the natural such as sea, soil. But it was explained from the first component that the major source of China was from the anthropogenic of using fossil fuels. And it was explained from the third component that the major source of Japan was from the anthropogenic of vehicle and industry. The result of factor anaylsis is correspond to chemical characteristics. Therefore we have to consider Japan as well as China in the air pollution aspect.
정태섭,유재연 全北大學校 附設 都市및環境硏究所 1997 都市 및 環境硏究 Vol.12 No.1
Under natural condition, the accuracy of measured and predicted value of regular distribution plume model was not good. This study proposed the Multi-Layer Gaussian Dispersion Model which is based on plume rise model and Surface-corrected Gaussian Model, and is able to predict the concentration when meteorologic condition is change. And studied merit and utilization of Multi-Layer Gaussian Dispersion Model. The results was as follows ; 1. Multi-Layer Gaussian Dispersion Model showed the trustful concentration distribution by means of mass flux up to atmospheric boundary or earth surface in change of spatial meteorologic condition. 2. Multi-Layer Gaussian Dispersion Model was simulated in short time relatively, because this model was based on regular distribution plume model. 3. The consideration of earth configuration was relatively simple, because the concentration was simulated by mass flux in boundary condition. 4. Therefore, if this model is more expanded by what is consider the change of meteorology in spatial and according to time, this model is applied immediately in urgency.
정태섭,이재용,유재연 全北大學校 附設 都市및環境硏究所 1997 都市 및 環境硏究 Vol.12 No.1
The purpose of this study is to estimate the removal efficiency of heavy metals and reclamation of wastewater and application to field plant as a new technology development using powder and ceramic filter made lf waste hard tissue. The major crystal structure is hydroxyapatite(Ca_10(PO_4)_6(OH)_2). The rising of pH according to powder dosage was showed up to pH8.0. However, these tendencies do not showed upper pH8.0. The hard tissue powder showed the preference of removal efficiency for heavy metals in the sequence of Zn>Cd>Pb, adsorption efficiency by competition in mixed component does not showed. The removal efficiency depend upon powder quantity at mixed component shows in sequence of Cd>Zn>Pb in shortage of powder dosage, Pb>Zn>Cd in sufficient. In the treatment of single component with the variation of heavy metal concentration, the break-point was showed in 20㎎/ℓ heavy metal conc., and in mixed component 10㎎/ℓ heavy metal conc. Reuse of waste hard tissue will give profits because quantity of waste disposal will be decrease and environmental purification will be accelerated by using the ceramic filter made from the waste disposal. And we can have the hard tissue cheaply.
정태섭,임익현,유재연 全北大學校 附設 都市및環境硏究所 1997 都市 및 環境硏究 Vol.12 No.1
Because of a sudden increase of vehicles, the limit of road capacity occurred. We are, therefore, constructing the road tunnel over l㎞ for the maximization of land use. To supply safe driving conditions in the road tunnel, we are controlling the exhaust emissions with a forced ventilation facility. The purpose of this study is to investigate the ventilation efficiency and the characteristics of tunnel on the change of natural ventilation force. To carry out this study, Sola program is transformed to fit for the road tunnel and it was simulated. The tunnel with ventilation system of transverse type is used as a objective tunnel. The results of this study are as follows; 1. The larger a natual ventilation force, the better a ventilation efficiency. 2. It is required the ventilation system dealing with quickly a change of the tunnel surroundings because of accumulation of 5m/sec. 3. The contaminant distributions in the near of ventilation system are highly stagnant in the left-below parts of tunnel, the below parts of air supply system and the below parts of ventilation system.