공회전 차량의 CO와 NOx의 배출 특성

정철현,이상권,정장표 慶星大學校 1998 論文集 Vol.19 No.1

Emissions of carbon monoxide and nitrogen oxides from domestic passenger cars were investigated using a portable gas analyzer(model: Kane May Quintox). The average concentrations of CO emitted from the vehicles selected randomly and classified by a model, ranged from 2,000 ppm to 3,000 ppm, while the concentrations of NOx ranged from 40 to 50 ppm. In addition, the very poor relationship among CO and NOx emissions, vehicle ages, and driving distance was observed. The results suggest that a strict emission regulation of vehicle exhaust gases, in manufacturing a new car, may be much more important for the CO and NOx emissions rather than an optimum maintenance of old cars.

물표면채집기를 이용한 부산지역의 대기건성침적특성

정장표,이승훈 慶星大學校 環境問題硏究所 1998 環境硏報 Vol.8 No.1

Atmospheric dry deposition involves the transport and removal of aerosols and gases from atmosphere onto surfaces in the absence of precipitation, which is an important mechanism in controlling the fate of airborne toxic pollutants and their movements from the atmosphere to natural surfaces. In spite of increasing awareness of the importance of dry deposition in the fate of airborne pollutants, many uncertainties exist on the methods for calculation and measurements of dry deposition. One of the most pervasive problems in studies of air toxics is our inability to adequately measure or model dry deposition. The establishment of monitoring methodology and the evaluation of dry deposition characteristics that can accurately measure and estimate the dry deposition of airborne toxics to water bodies is imperative to prevent water bodies from being contanimated and to establish the management policies of water quality conservation. In this study, the flux of sulfate(SO??), nitrate(NO??) and chloride Cl?? measured in Pusan were (28.77. 21.86), (8.85, 5.18), (4.53, 2.69) ㎎/㎡/day, respectively. In addition the ratios of daytime fluxes to nighttime fluxes were 1.32, 1.71 and 1.68. From the above results, the fluxes of daytime showed higer than those of nighttime for all three acidic aerosols. 2. By the results of the differences in fluxes of SO?? and NO?? by the sample sites, the total average fluxes of SO?? in Chicago, Seoul and Pusan were 24.15, 21.50, 25.32 ㎎/㎡/day respectively, which showed similar flux levels. And the flux of NO?? in Pusan was 6.39 ㎎/㎡/day which was higher than 5.08 ㎎/㎡/day in Seoul. 3. The particle size distribution analysis for the samples of water surface showed that the particle size ranged from 30 ㎛ to 400 ㎛ and the particle distribution curve showed typically bell type of one peak. But the particle distribution curve was irregular type of multi-peaks and the particle size ranged from sub-micron to 400 ㎛ for the samples of dry deposition plate.

부산시 부유분진에 대한 농도 및 입도분포 함수 적용에 관한 연구

정장표,정창용,조성훈 慶星大學校 環境問題硏究所 1994 環境硏報 Vol.4 No.1

It is necessary to identify the characteristics of concentration and size distribution of suspended particulate matter for establishing efficient air quality management plans and options such as choice of control device, establishment of criteria and standards and etc., Therefore purpose of this study is to evaluate the possibility of application of concentration and size distribution functions for suspended particulate matter in Pusan. In this study, Weibull and lognormal probability distribution functions were applied for TSP concentration data from monitoring stations and size analyzed data sampled at Bum-chun receptor site. And their goodness of fit tests such as χ²-Test, Shapiro-Wilk statistic test, and quantile-quantile plot test were done. From this study, it was obtained that concentration and size distribution for sispended particulate matter in Pusan, were well fitted to both Weibull and lognormal probability distribution function.

대기확산 모형의 민감도 분석에 관한 연구

정장표,박명호,이기호 慶星大學校 1990 論文集 Vol.11 No.3

Air quality dispersion models(AQM) are widely used to control air pollutants and to predict the distributions of air pollutants. But A. Q. M have many problems and limitations, therefore it is necessary to validate models before use. So in this study, to improve the model accuracy, the sensitivity analysis of three short-term models(TEM, RAM, PTMTP) is performed. The conclusions obtained from this study were as follows. 1) TEM model shows generally lower concentration than other two models, and the concentration values of RAM and PTMTP models are almost same over than 1km of downwind distance. 2) It appears that the sensitivities of stack height stack inner diameter, gas exit velocity and wind speed, are significant. And their Sensitivity coefficient of maximum concentration is consider ably high. 3) The gas exit velocity, stack inner diameter, gas temperature and air temperature which affect the plume rise, have some effect on the concentration values of each model within the downwind distance where final plume rise is determined. 4) The sensitivity coefficient of there models with downwind distance show larger value in the near distance from source.

농촌지역의 비점오염원 유출 특성에 관한 연구

정장표,차건봉,김좌관 慶星大學校 環境問題硏究所 1993 環境硏報 Vol.3 No.1

The purpose of this study is to find out characteristics of nonpoint source-pollutant loads For this, in the aspect of water guality Change during storm days, the relationship between Stream flow and pollutant mass loads was studied. Also the contributions of loading rates from nonpoint sources were calculated. In this study, the drainage area of Sooyeong river, upstream of the Hoedong reservoir, was investigated. The reservoir used for drinking water source in Pusan, is located in a rural area and few point sources in its drainage area. The results of this study were as follows. Changes in water quality during rainfall showed that parameters such as COD, PO₄-P, T-P, NH₄-N concentration increased about two times, on the other hand, NO₂-N, NO₃-N concentration decreased to about two third of the concentrations in drying periods. The regression equations for stream flow versus pollutant loads were obtained as follows: COD : LOG(M)=-4.531+1.396×LOG(Q) r²=0.768 NH4-N : LOG(M)=-3.227+0.948×LOG(Q) r²=0.825 NO2-N : LOG(M)=-5.744+1.216×LOG(Q) r²=0.641 T-P : LOG(M)=-8.303+1.804×LOG(Q) r²=0.811 PO4-P : LOG(M)=-7.726+1.660×LOG(Q) r²=0.820 The rate of pollutant contributions from nonpoint sources was 80.4% for COD, 75.8% for NH₄-N, 53% for NO₂-N, 57.3% for NO₃-N. 85% for T-P, 89% for PO₄-P, and that of phosphorous pollutant was higher than that of inorganic pollutants. The loading rates of nonpoint pollutants were calculated as 3.76kg/ha/d(COD), 0.2kg/ha/day(NH₄-N), 0.076kg/ha/d(T-P), 0.037kg/ha/d(PO₄-P), respectively. Results above mentioned showed that the pollutant contributions from nonpoint sources were not negligible and the control and management of nonpoint source were urgently needed.

大氣擴散模型의 最大着地點에서의 敏感度 分析에 관한 硏究 : RAM, ISCST 模型을 事例로

鄭長杓,朴明浩 慶星大學校 環境問題硏究所 1991 環境硏報 Vol.1 No.1

Air quality dispersion models(AQM) are widely used to control of air pollutants and to predict the distridutions of air pollutants But AQM have many problems and limitations, therefore it is necessary to validate models before use. So in this study, to improve the model accuracy, the sensitivity analysis of two short-term models(RAM,ISCST) is perforned. The conclusions obtained from this study were as follows. 1) RAM model shows generally lower concentration than ISCST models, and the concentration values of RAM and ISCST models are almost same over the maximum concentration of downwind distance. 2) It appears that the sensitivities of gas exit velocity, and wind speed, are significant. The sensitivities on the change of mixing And their Sensitivity coefficient of maximum concentration is considerably high. 3) The gas exit velocity, gas temperature which affect the plume rise, have some effect on the concentration values of each model within the downwind distance where final plume rise is determined. 4) The sensitivities on the change of mixing height is insignificant in each model in case of mixing height, is close to effective height of stack. 5) The sensitivities on the change of ambient air temperature stack exit velocity are lowest. And the sensitivity coefficient of two models with downwind distance show larger value in the near distance from source. 6) The sensitivities on the change of emission rate are not appear and that concentrations are computated relatively. 7) It appear that the maximum concentration of downwind distance on differential stack height are influenced than the other input parameter.

착지점 모형의 이론적 고찰(Ⅰ)

정장표 慶星大學校 環境問題硏究所 1994 環境硏報 Vol.4 No.1

Sourxe apportionment methods such as rexeptor models are widely used to egt the information of the relationship between receptor and sourxes for the resonble controlling of pollution level. Especially, the wider applications nof rexeptor models are expected in the futre owing to the advances in the theory and the developments in sampling tools and analytical instrument. Therefore, focuses of this study were concentrated on ; 1) the comparison of characteristics and functions between source model and receptor model, 2) the principles of receptor model including stating the fundamental structure and assumptions, and identifying usefulness and limitations of receptor model, and 3) the types of receptor model and thier advantages and disadvantages.

FA/MA 방법에 의한 부산시 부유분진의 오염원 할당

정장표, 이승훈, 윤항묵 경성대학교 환경문제연구소 2000 環境硏報 Vol.10 No.1

The object of this study was to identify source categories of Busan area through FA/MA methodology which contribute to the concentration of suspended particles at receptor. According to the purpose of this study, twenty-seven chemical species such as elements, anions, and total carbon of chirty-six PM10 and TSP data sets sampled at Bumchun receptor site for a 24hr period from May to Aug. 1992, were analyzed and applied to FA/MA model. From this study, the following conclusions were obtained. From the factor analysis for measured data, steel, mill-related, transportation, soil dust resuspension, marine, fuel oil, secondary aerosol source, and etc., of which total variance explained by the identified factors was calculated as 84 ∼ 91%, were identified. And the trend was shown that the more the number of input trace materials was, the more difficult the identifications of factors were, relatively. Selecting the representive tracers for identified factors based on the factor loadings, the following equations were obtained by use of stepwise method in multiple linear regression for the cases. TSP(㎍/㎥) = 27.996+0.033Mg +0.016Cl-+0.O05SO42 Case 1 TSP(㎍/㎥) = 11.779 + 2.013Ti + 0.034Na + 0.026Mg + 0.006ca Case 2 PM10(㎍/㎥) = 3.130+0.O04 SO42 +0.010 Cl- + 1.812Ti Case 1 PM10(㎍/㎥) = -14.028+1.515Ti +0.D38Na + 0.O09 Cl- + 0.003 SO42- Case 2 In comparison with the results of FA/MR model with the change of the newly added input tracers, the case with TSP showed relatively unstable results of factor analysis for the case studies because of insufficient number of data available to complete a factor analysis for the tracers used.

부산시 자동측정망자료의 Weibull 확률분포함수 적용 및 기준치 적합성평가

정장표,이승훈 경성대학교 공학기술연구소 1998 공학기술연구지 Vol.5 No.-

The urban air quality in Korea has been deteriorated due to the rapid urbanization, industrialization and sudden increase of traffic volume. To scope with the air pollution problems, we need to establish the effective air quality management strategies based on evaluating the status of pollution and characteristics of concentration through the continuous monitoring. Also, We need to not only assess the degree of air pollution accurately based on the ambient air quality standards, but also check out whether the ambient air quality standards were properly established. From this study, it was obtained that concentration distribution for the criteria-pollutants measured at eight-air monitoring networks in Pusan area in 1997, was well fitted to Weibull probability distribution function. And the degree of differences from air quality standards and the expected values obtained from Weibull concentration distribution function were in order of CO(0.83∼0.90)〉SO₂(0.45∼0.80)〉TSP(0.24∼0.53)〉NO₂(0.23∼0.45)〉O₃(0.11∼0.30) in Pusan Area.

부영양화 모형적용을 위한 人工댐湖의 環境要因 分析

정장표,김좌관 慶星大學校 環境問題硏究所 1992 環境硏報 Vol.2 No.1

We have studied for the application eutrophication model and requirement of the basic data in ecological characteristics in man-made reservoirs. So in this study, we had the conclusions as follows. 1) It was proved phosphorous was limiting factor according to MBOD test results 2) Phosphorous deposition rate & velocity had high values because of injection of algicide & high productivity of algae. 3) SOD in Hedong reservoir had relatively low value as SOD of 0.618㎎/m²day 4) In photosynthethic survey, chl-a method was appropriate for the application of DO mass balance equation. Also, the highest DO production rate has placed on 3 m-depth.