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김용국 한국환경과학회 1998 한국환경과학회지 Vol.7 No.5
A Jump model was evaluated for the calculation of hourly mixing height and mean potential temperature within the height. The Jump model was modified for estimation of downward heat fluxes by mechanical convections and surface heat fluxes. The surface heat fluxes were estimated from routine weather data such as solar radiation and air temperature. Total of 8 upper-air data observed at 0000UTC and 0600UTC in Osan station during April 23 to 26, 1996 were analyzed, and compared to the model results in detail. The calculated mixing heights and potential temperatures within the height were comparable to the observations, but some differences were showed. The calculated mixing heights were generally higher than observations. And, when variations of wind directions were large, the large difference of potential temperature was occurred. From the results, it was important to note that vertical motions and advections of air masses would affect to the growth of the mixing height.
김용국,이종범 江原大學校 附設 環境硏究所 1996 環境硏究 Vol.13 No.-
A new neural network model has been developed to predict short-term air pollution concentration. In addition, a multiple regression model widely used in statistical analysis was tested. These models were applied for prediction of daily maximum ozone concentra-tion in Seoul during the dummer season of 1991. The time periods between May and Sep-tember 1989 and 1990 were utilized to train set of learning patterns in neural network model, and to estimate multiple regression model To evaluate the results of the different models, several performance indices were used. The results indicated that the multiple regression model tended to underpredict the daily maximum ozone concentration with small r^(2)(0.38). Also, large errors were found in this model; 21.lppd for RMSE, 0.324 for NMSE, and -0.164 for MRE. On the other hand, the results obtained from the neural network model were very promising. Thus, we can know that model has a prominent efficiency in the adaptive control for the non-linear multi-variable systems such as photochemical oxidants. Also, when the recent new information was added in the neural network model, prediction accuracy was in-creased. From the new model, the values of RMSE, NMSE, MRE and r^(2) were 13.2ppb, 0.089, 0.003 and 0.55 respectively.
이종범,김용국,박일환 江原大學校 附設 環境硏究所 2001 環境硏究 Vol.18 No.-
This study was carried out estimating the dry deposition flux of SO₂at eight urban areas in Korea during one year of 1999. To calculate the deposition flux, deposition velocities were calculated by turbulence parameters estimated from routine meteorological data. Also, hourly averaged SO₂ concentrations which calculated from air pollution monitoring data of each city were used. The dry deposition velocities were mostly higher in the coastal areas than the other areas, which would be caused by relatively strong wind. And, they were high in the daytime because of turbulence activitie. The deposition flux SO₂ is mainly related to the atmospheric concentration. The annual average SO₂ concentration and the deposition flux were 22.62ppb and 1510.52g/㎢/hr at pusan respectively. Also, the flux was higher in winter than other season, which was a significant contribution of exhausted fuel for heating. While the deposition velocity was high to 0.688㎝/sec at Yosu in case of strong wind and small cloud cover, the deposition flux was high to 1597.4g/㎢/hr at pusan in case of weak wind and small cloud cover.
이종범,김용국,김태우 江原大學校 附設 環境硏究所 1994 環境硏究 Vol.11 No.-
An observational study of urban heat is1and was carried out using field data obtained during 6 day in May and August 1992 in Chunchon(Population size 180,000). Air temperature was measured at 04 points along two sampling routes by thermisters attached to cars, Both routes cover urban and rural area and across the center of urban area, Continuous observation of air sonde was performed to clarify heights of nocturnal boundary layer(NBL) at the center of urban area. Surface meteorological observations were performed at both urban and rural site. This study showed that heat island Phenomena was obvious1y observed at the urbanized area during the night time With low wind Speed. The average NBL heights extended to about 100 meters, but varied with meteorological conditions. After sunset the air temperature decreased with time at both sites and cooling rate at the urban site was Heater than the rural site. The maximum heat island intensity was 7.5°C at 21 LST May 4. Using the two meteorological data gets obtained from urban and rural sites, the air Pollutant concentration was calculated by Gaussian plume model which can obtain not only horizontal distribution of concentration but also vertical distribution. The result indicated that the concentration resulted from urban meteorological data set was lower than that from rural meteorological data set. It was also calculated that the air pollutant extended to higher level in urban meteorological data set than that in rural meteorological data set.
Pasquill 安定度階級의 評價와 安定度 Parameter 推定方法의 開發
李鍾範,金龍國 江原大學校 附設 環境硏究所 1990 環境硏究 Vol.7 No.-
Pasquill stability class (PSC) was evaluated with Monin-Obukhov length (L) using the data observed at a height of 213m meteorological tower in Tsukuba, Japan. PSC was determined with wind speed and insolation (net radiation at night), and L was calculated with the heat flux and the friction velocity obtained at 25 m by the eddy correlation method. To evaluate PSC with L, for every class of Pasquill stability(from A to F class), percentiles and median of L were used. Results show that for every class of Pasquill stability, L varies so widely that PSC does not adequately represent the atmospheric stability conditions. The scheme which estimates L using air temperature at two levels and wind speed at single level was developed. Comparison between estimated L by the scheme and observed L reveals that the scheme is better than PSC. Furthermore, the scheme is more advantage than PSC because it uses air temperature at two levels instead of insolation shich is more difficult to observe in the ifeld than air temperature.