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복잡 지형의 대기질 예측을 위한 지상자료동화의 효용성에 관한 수치연구
이순환,김현숙,이화운 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.4
In order to raise the accuracy of meteorological data, several numerical experiments about the usefulness of data assimilation to prediction of air pollution was carried out. Used data for data assimilation are surface meteorological components observed by Automatical Weather System with high spatial density. The usage of surface data assimilation gives changes of temperature and wind fields and the change caused by the influence of land-use on meterological simulation is more sensitive at night than noon. The data quality in assimilation is also one of the important factors to predict the meteorological field precisely and through the static IOA (Index of Agreement), simulated meteorological components with selected limited surface data assimilation are agree well with observations
이화운,장난심,곽진,이희령,김희만 한국환경과학회 2002 한국환경과학회지 Vol.11 No.3
The purpose of this study is designed to estimate the air quality of subway stations that have the underground platforms in Pusan Metropolitan City, from September to November 2000, over seventimes. The subjects include Yonsan-dong station, Somyon station, Pusan station, Nampo-dong station, and Tushil station. The samplings were conducted at three points of each station, i.e. gate, ticket gates, and platforms. The major materials for analysis were CO, NO, NO_2, and O_3. The experiment was conducted at 7:00 pm with KIMOTO HS-seven Handy sampler and Tedlar Bag of SKC INC(U.S.A). In order to more fully understand station environments, we also measured temperature at each point. The results showed that O_3 average concentration at Yonsan-dong station was higher than others with 38~51 ppb. The average concentration of NO was high at ticket gate and platform at Somyon station(119 ppb, 122 ppb), Nampo-dong station(102 ppb, 100 ppb). These results show that the air pollution of stations with underground shopping malls was higher than others. At Somyon station having a junction station, NO and NO_2 concentration level of platform-2(noncrowded) was higher than platform-1(crowded). This is most likely due to the accumulation of air pollutants and inadequate ventilation systems.
이화운,박종길,장난심,이희령,김희만 한국환경과학회 2003 한국환경과학회지 Vol.12 No.1
With increasing population denities in cities, underground facilities and entertainment are proliferating at a rapid pace in efforts to maximize the use of land. The purpose of this study is to evaluate CO concentration level of subway stations having underground platforms in Busan Metropolitan City, from September to November 2000, over seven times. The places of inquiry include Yongsan-dong station. The samplings were conducted at three point of each station, i.e. gate ticket gates, and platforms. The component of CO concentration is the main elements of indoor air quality evaluation. The total concentrations and average concentration of CO were the higher at the average concentration of CO were the higher at the Somyon station. The distribution of CO concentrations at each station, generally was higher at gate than ticket gates platforms. The I?O ratios(I-platforms, O-gates) were expressed highly than 1 at the Yongsan-dong station, Busan station, Nampo-dong station and were lower 1 at others.
이화운,김유근,정우식,오은주,임헌호,노순아,반수진,최현정,김민선,김헌숙 부산대학교 환경문제연구소 2002 環境硏究報 Vol.20 No.-
In the view of the results investigated the effect of air pollutants that is emitted from a new generator facilities, the total estimated concentration which is the summation of a contributional concentration and observational concentration is much less than that of atmospheric environment criterion for the air pollutants. So we can predict that the operation of the new generator facilities with mitigation equipment don't seriously affect around environment. At the same time, we compared the contributional concentration of before mitigation equipment with that of after it to examine the decreasing amount due to mitigation equipment. The result showed that the concentration of SO2, NO2 and PM-10 is reduced to 25%, 30% and 26% of original value, respectively.
광학적 rank order HMT를 이용한 회색조 영상 인식
李河運,具和本 동양대학교 1996 동양대학교 논문집 Vol.2 No.1
광학적 rank order HMT를 이용한 회색조 영상에서의 새로운 물체 인식 방법을 제안 한다. 기존의 방법은 4개의 문턱화 레벨과 필터 융합을 사용하므로 시스템이 복잡하고 물체를 인식하기 위해서는 많은 시간이 소요될 수 있다. 제안한 방법에서는 회색조 영상을 적당한 값으로 이치화하고 이렇게 이치화된 영상은 hit 필터로 사용되고 이치화된 영상의 complement 영상은 miss 필터로 사용된다. 이러한 방법은 기존의 알고리듬에 비해 광학적으로 구현할 경우 비교적 간단히 할 수 있으며 물체 인식에 좀더 좋은 결과를 얻을 수 있다. A new gray-scale object recognition algorithm is presented using optical rank order HMT(hit-miss transform). The conventional HMT recognition algorithm uses 4 thresholding levels and filter fusion, therefore this system is complicate and may needs much time to detect objects. In the proposed method, gray-scale image is binarized with proper thresholding values and the binarized image is used for hit filter and its complement is used for miss filter. This method can give simple optical-implementation and better performance for object recognition compared to the conventional algorithm.
이화운,김유근,임주연 부산대학교 환경문제연구소 1995 環境硏究報 Vol.13 No.-
The accuracy and applicability of numerical simulation model for land-sea breezes are studied by the computative study between analytical model and numerical simulation results. In the model, Defant's equation which has analytical solution was selected. Both numerical and analytical solutions represented well land and sea breezes under the condition of various diffusion coefficients and hydrostatic and nonhydrostatic conditions. By the results, the numerical simulation method was proved as an appliable technique to simulate accurate land-sea breezes.
[논문]부산광역시 지하철역의 오염물질 농도 변화에 관한 연구
이화운,박종길,장난심,이희령,김희만 부산대학교 환경문제연구소 2004 環境硏究報 Vol.22 No.-
on the variation of Air Pollutants concentration in Subway Station at Busan Metropolitan City
이화운,문난경,임주연 한국환경과학회 2002 한국환경과학회지 Vol.11 No.12
The purpose of this study is to estimate wet deposition flux and to investigate wet deposition characteristics by using the ADOM model. Wet deposition flux of high reactive SO_2 is estimated by applying observed meteorological parameters and concentrations of chemical species to the ADOM model. Wet deposition is largely dependent on large scale precipitation and cloud thickness. Wet deposition flux of sulfate increases, but wet deposition flux of SO_2 is small. On the whole, the pattern of sulfate flux agrees with the typical pattern of sulfate wet deposition that is high in the summer(July) and low in the winter(January)