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RISS 인기검색어
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- 저자 : 장영환 ( Young Hoan Jang ) (검색결과 5 건)
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Annular Denuder System을 利用한 大氣 에어로졸 中 黃酸鹽과 室酸鹽의 濃度特性
김영태,정장표,장영환 慶星大學校 1998 論文集 Vol.19 No.2
The effects of acidic aerosols have been reported to be more severe, so the recent studies were focused on identifying the characteristics of acidic aerosols, and their formation mechanisms. Therefore in this study the cyclon/annular deluder/filter pack sampling system was sued to collect and evaluate acidic aerosols in Pusan area in order to investigate the variation characteristics of the secondary inorganic pollutants(SO₄,NO₃). Forty-eight 12-hr average samples, equally divided into day/night intervals, were collected at Kwangan-dong sampling site where continuous air monitoring system was operated, from June, 1995 to November, 1995. The important conclusions obtained in this study were as followings ; The highest and lowest values of monthly averaged concentration occurred in July(12.47±3.15㎍/㎥) and september (4.00±3.15㎍/㎥) for SO₄, and in July(4.10±4.76㎍/㎥), and September(0.41±0.39㎍/㎥) for NO₃. These concentration levels were in the same range as observations in other urban areas. In order to examine the relationships between the concentrations of sulfate and nitrate, and their influencing factors, the correlation analysis was conducted. From the results of correlation analysis, the following results were obtained : 1) the value of correlation coefficient between SO₄, and SO₂showed higher in daytime(r=0.46) than in nighttime (r=0.38), and in summer season(r=0.61) than in autumn season(r=0.15) and in condition of relative humidity less than 70%(r=0.50) than in condition of relative humidity more than 70%(r=0.35). 2) Especially the SO₄concentration has the highest correlationships (r=0.94) to SO₂concentration for the data of daytime in summer. 3) The value of correlation coefficient between NO₃ and NO₂ showed higher in daytime(r=0.41) than in nighttime(r=0.74), especially showed highest value(r=0.74) for the data of nighttime in summer. 4) The NO₃concentration has the reverse correlationships to temperature, and the highest value of correlation was calculated as -0.69 for the data of daytime of autumn. From the above results about concentration characteristics and correlationships for SO₄and NO₃, the following comprehensive conclusions were obtained : 1) There were similar trends of concentration variation between SO₄and NO₃. 2) The concentration of SO₄was closely related with relative humidity but that of NO₃ was related with atmospheric temperature. 3) The formation mechanism by photochemical action and NH₄NO₃dissociation reaction were considered to have influence on the concentration variation of SO₄and NO₄.
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윤종태,장영환,정장표 경성대학교 생산기술연구소 1997 생산기술연구지 Vol.4 No.-
Recently, the high level noise from the water drainage duct in apartments raised serious social problems. Therefore, the development of noise reduction duct which can both keep the proper drainage function and have high efficiency of noise reduction is needed. In this study, the dual hallowed type of noise reduction duct was developed and its performance tests such as noise reduction effect, strength test etc, were conducted. From the results of performance tests, the noise reduction duct developed by this study was sufficient for market competition compared to pre-made PVC duct.
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이현희,정장표,장영환,이무강 慶星大學校 環境問題硏究所 2002 環境硏報 Vol.12 No.1
According to the conclusion of this study, air pollution concentration of Youngdo-gu belong to Seobu educational institution was in the lowest density.(SO_2 : 0.002 ppm, PM-10 : 32 ㎍/㎥, No_2 : 0.016 ppm) and Dongnae-gu belong to Dongnae educational institution was in the highest.(SO_2 : 0.002 ppm, PM-10 : 88㎍/㎥, No_2 : 0.047 ppm) Air pollution level by classification of each educational institution about elementary schools, middle schools, high schools in Busan appeared that the pollution level about all air pollutants appeared high in Dongnae, Dongbu, Bukbu, Haeundae, Nambu, Seobu in due order. Air pollution level by classification of each Gu about elementary schools, middle schools, high schools in Busan appeared that the pollution level of Geumjeong-gu was very high (SO_2 : 0.002 ppm, No_2 : 0.047 ppm, PM-10 : 89 ㎍/㎥) and level of pollution around high school in Busan was the highest. To improve air quality getting worse day by day, steady and systematic control of observing the air quality standards should be continued. The more effective and active method of air quality improvement should be considered.
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