제주도에 수송되는 황사의 사례분석

이기호,허철구 제주대학교 환경연구소 1995 환경연구논문집 : 제주대 Vol.3 No.1

This study is carried out to investigate the charactexistis of the yellow sand transported to Cheju dand on 1995 and its influence on the concentration of TSP at Cheju area. For this purpose, the collection of TSP is conducted by using a high volume air sampler and the analyses of weather maps is also performed. By the analysis of weather map, it can be seen that the yellow sand ocurred at Cheju area on March 1995 is tramporkd from the upstream of the Yellow River via Shanghai region The duration time far this case is 32 hours at Cheju area. Although the source regions of yellow sand occurred on April are not dearly inferred on the weather map, it can be confirmed that the bend of yellow sand is flowed to Cheju area f&wd by cyclone passage with cold fornt passing the Korean penmda. It can be also confirmes that the of 40-9 knots in the 700hPa layer and southward movement of cold core. circulation associated with the yellow sand is characterizd by the westerly to north-weaskly The concentration of TSP when the yebw sand occurrs is increased over 4 times than normal period.

제주도의 대기오염 현황 및 장래예측

허철구,이기호,강창희 제주대학교 환경연구소 1993 환경연구논문집 : 제주대 Vol.1 No.-

This study deals with the air pollution status, the characteristics of air pollution sources and the prediction of future air quality in Cheju. The present air quality is estimated very satisfactorily in comparison with the air quality standard. And the concentration of sulfur dioxide in ambient air has been increased little for the last five years. The primary major source of air pollution is transportation which include 57% of total emissions of air pollutants. Also. air pollution sources are rnaldistributed on the seashore, especially concentrated on Cheju city, The emission rate of air pollutants in Cheju is 43,766 ton/year. but emissions per uint area (24ton/year. ㎢) is of very small quantity in comparison with that of other region. On the other hand, the ambient air quality a t the year 2001 is predicted by Val-ley model is lower than the air quality standard, althought emission rate is increased due to increasing in air pollution sources.

Holzworth 방식에 따른 제주시의 대기 혼잡고 산정

이기호,허철구 濟州大學校 海洋硏究所 2002 해양과환경연구소 연구논문집 Vol.26 No.-

Our previous study has indicated that the morning mixing heights are believed to be overestimated, so the application of an adjustment factor to account for the heat-island effects suggested by Holzworth to data obtained at Jeju region still contains uncertainties. Therefore, the efforts are made, more properly, to calculate the urban morning mixing heights of Jeju City. For this purpose, the mixing heights at Jeju City are estimated twice for each day of one-year records of upper air observation at Gosan and surface air observation at Jeju City, by using the Holzworth approach during one year from November 1997. On the basis of urban-rural differences of minimum surface temperatures, it can be shown that the adjustment factor of 1℃ insead of 5℃ suggested by Holzworth is more reliable to account for the heat-island effects on Jeju region.

대기환경지수를 이용한 제주지역 대기질 평가에 관한 기초적 연구

허철구,이기호,박용이 제주대학교 환경연구소 1997 환경연구논문집 : 제주대 Vol.5 No.-

The assessment of the air quality of Cheju area was carried out by AI(Air Index) and AEI(Air Environment Index). The air quality data, which measured at two air pollution monitoring network(Idodong ; located at Cheju city, Yongsuri ; located at western coastal region of Cheju island), were used in this study. The average concentration of major air pollutants(SO_(2), NO_(2), CO, TSP(PM-10)) were very low, but the ozone(O_(3)) concentration remarkably high. The monthly A1 values at Idodong and at Yongsuri were 7.0 ± 1.8 and 4.7 ± 1.4, respectively, therefore the air quality was classified as 'Good' level. And the monthly AEI values at same regions were in the range of 16.9-20 and 20.1-28, respectively, so the air quality was classified as 'Moderate' level. We found that the same air quality data was assessed at different level according to estimating mothod by A1 or by AEI. It seemed that the modification of the subindex and/or standard level was necessary to estimate A1 and AEI practically. Also, it was found that the critical pollutant was ozone in estimating A1 and AEI at Cheju area. But it assumed the ozone at Cheju area was caused by natural sources but anthropogenic sources. Thus, it seemed that the local background level of air pollutants was considered in estimating AI and AEI.

제주지역 지표 오존 농도의 시·공간적 분포 특성

이기호,김대준,허철구 한국환경과학회 2004 한국환경과학회지 Vol.13 No.4

This study has been performed to clarify the characteristics of temporal and spatial distribution of surface ozone concentration over Jeju Island, one of the cleanest areas in Korea with low emissions of air pollutants. Ozone data are monitored at four sites in Jeju Island. These monitoring sites are located at two urban area(referred to Ido and Donghong), coastal area(Gosan site) and forest site(Chuna site). Ozone data has been routinely collected at these sites for the late four years. The patterns of seasonal cycle of ozone concentrations at all stations show the bimodal with the peaks on spring and autumn and a significant summer minimum. However, the patterns of diurnal variations at rural station, i.e., Gosan and Chuna sites are considerably different to those at urban stations such as Ido and Donghong sites. The patterns of ΔO₃ variations are very similar with those of monthly mean ozone concentrations and ΔO₃ values are exceeded 30 ppb, at urban stations. This may be that urban stations are more influenced by local photochemical reactions rather than rural stations. In order to assess the potential roles of meteorological parameters on ozone formation, the meteorological parameters, such as radiation, temperature, and wind are monitored together with ozone concentrations at all stations. The relationships of meteorological parameters to the corresponding ozone concentration are found to be insignificant in Jeju Island. However, at Gosan and Donghong stations, when the sea breeze blew toward the station, the ozone concentration is considerably increased.

제주시 대기부유분진 중 수용성 이온성분의 입경별 분포특성

허철구,송정화,이기호 한국환경과학회 2004 한국환경과학회지 Vol.13 No.12

Atmospheric particulate matters were collected by 8-stage non viable cascade impactor from October 2002 to August at Jeju City. Eight water-soluble ionic components (Na^(+), NH₄^(+), K^(+), Ca^(2+), Mg^(2+), Cr^(-) NO₃^(-) and SO₄^(2-)) were analyzed by Ion Chromatography. The concentration of particulate matters and eight water-soluble ionic components were determined to investigate their size distributions. Particulate matters exhibited a tri-modal distribution with peak value around 0.9, 4.0㎛ and 9.5㎛. In summer, the last peak value was lower than other season values likely due to particulate matter scavenged by rain water. Four ionic components (Na^(+), Ca^(2+) Mg^(2+) and Cl^(-)) exhibited a bi-modal distribution in the coarse mode whereas three ionic components (NH₄^(+), K^(+) and SO₄^(2-)) in the fine mode, with maximum peak value around 0.9um. NO₃ was found in both the coarse and the fine mode. The enrichment factor (E.F.) of each ionic components was calculated. Based upon E.F., it is considered that Na^(+), Cr, and K^(+) in coarse paricle mode were delivered form oceanic source, but other components might have other source origins.

제주도 해안가에서 측정된 에어로졸의 성분별 입경분포 특성

이기호,양희준,허철구 한국환경과학회 2003 한국환경과학회지 Vol.12 No.10

During the period from April to September 2002, the size distributions of ambient aerosol were measured at the coastal site at Hamduk in Jeju Island. Na^(+), K^(+), Mg^(2+), Ca^(2+) and CF exhibited mostly a bimodal coarse mode size distribution, while ammonium and sulfate were mainly in the fine size range, with maximum at around 0.54um. The average molar concentration ratio of ammonium to sulfate for fine particles was equal to 2.0±0.9. Nitrate was evenly found in both the coarse and fine modes. Elements like Al, Fe, Cu, Mg. Na. Ti. Sr and Mn were dominant in coarse particles, with the maximum at around 5.25㎛. S and Pb were mainly in the submicrometer size range. Other elements with a fine and coarse modes were V. Ni, Cu, Ba and Mo. The patterns of the size distributions of trace elements measured at the downtown in Jeju City were very similar to those at the coastal site in Hamduk. However, the amplitude of size fractional concentrations at Jeju City was narrower than that at Hamduk. While the mass median diameters for the chemical species originated from the natural origin such as marine and crust were relatively large, those for ammonium, sulfate, S and Pb were very small.

HARVARD STEP TEST에 의한 血液成分 變化에 관한 硏究 : 女子 陸上中距離選手를 中心으로

李鐵煥,許峰蓋,朴次榮 진주여자전문대학 1992 論文集 Vol.15 No.-

With 5 girls middle-distance runner of the track and field in K Physical High School, tried to find out how to change the component of blood after taking exercise for 5 minutes with Harvard Step. The Conclusion is as follows. 1. The white blood cell of all subjects was increased 38.78% from 8.92±0.76×10^(3)/mm^(3) of stability to 12.38±2.51×10^(3)/mm^(3) in a minute of recoved after taking exercise, proved meaningful increase at the meaningness level of p〈0.05 and recovered after 20 minutes by 8.68±1.94×10^(3)/mm^(3) stability cost. 2. The red blood cell of all subjects was increased 9.63% from 4.36±0.23×10^(6)/mm^(3) of stability to 4.78±0.19×10^(6)/mm^(3) in a minute of recovering after taking exercise, proved meaningful increase at the meaningness level of P〈0.02 and recovered after 20 minutes by 4.35±0.19×10^(3)/mm^(6) stability cost. 3. The hemoglobin of all subjects was increased 11.64% from 11.34±0.80g/㎗ of satability to 12.66±0.25g/㎗ in a minute of recovering after taking exercise, proved meaningful increase at the meaningness level of p〈0.02 and recoverd after 20 minutes by 11.22±0.59g/㎗ stability cost. 4. The hematocrit of all subjects was increased 10.90% from 35.76±1.19% to 39.64±1.14% in a minute of recovering after taking exercise, proved meaningful increase at the meaningness level of p〈0.01 and recovered after 20 minutes by 35.98±1.72% satbility cost.

수중의 Pyrene, Chrysene 및 Benzo[a]pyrene의 광분해(I)

김지용,허철구,이민규,감상규 한국환경과학회 2003 한국환경과학회지 Vol.12 No.3

The photodegradation of pyrene, chrysene and benzo[a]pyrene, that were similar in structure among polycyclic aromatic hydrocarbons (PAHs), were investigated in water irradiated with a low-pressure mercury lamp (wavelength of 253.7㎚ and UV output of 1.35×10^-3J/s). The effects of several factors (t-BuOH, HCO_3^- and pH) on photodegradation of above three PAHs were also examined. The photodegradation rates of PAHs decreased with increasing the concentration of t-BuOH, but decreased little with increasing the concentration of HCO_3^- under the concentrations used in this study. The photodegradation rates of PAHs decreased with increasing pH, but their change were greater in case of pH increase from acid to neutral and were little in case of pH increase from neutral to base. The photogradation rates of PAHs fitted a first-order kinetic model and their photogradation rates decreased in the following sequences: pyrene>chrysene>benzo[a]pyrene among the PAHs used.

폐기물 소각재의 매립처분시 중금속 용출특성

박용이,허철구,이기호 濟州大學校工科大學産業技術硏究所 1996 尖端技術硏究所論文集 Vol.7 No.2

This experimental study is carried out to estimate leaching characteristics of heavy metals in landfill of the ash from waste incinerator. The results obtained from this study are as follows. The leaching fractions of Zn, Cd, Fe and Ca are increased remarkably with increasing of the flow rate of influent water but the leaching fraction of Cu has quite small difference with flow rate. The leaching fractions of Zn, Cd, Cu and Ca are higher in early leaching period but the insoluble phenomena of these elements are turned up in later leaching terms. However the leaching fractions of Fe and Pb are almost constant from early leaching period to later leaching period. The cumulative leaching weights of heavy metals in condition of pH 3.7 of influent water are more than those in condition of pH 5.7. Also, the leaching rate of Cd, Ca and Zn are increased evidently only in initial leaching period, otherwise, those of Pb, Fe and Cu are increased continuously to the end in condition of pH 3.7. And the leaching weights of heavy metals from fly ash are relatively more than those from bottom ash but the those from mixed ash is similar to bottom ash. When soil layer is added to ash packed in column, the leaching weights of heavy metals from column are decreased remarkably as compared with those of only mixed ash packed.