미술이 형성되고 발전하는 과정은 다양한 작용하는데, 특히 ‘사상’은 미술 전개에 중요한 이에 본 연구에서는 선종사상이 반영된 동아시아 하였다. 선종은 언어와 문자를 초월해 좌선과 도달할 수 있다고 보았기 때문에 직관과 기존의 불교는 경전과 의례의 형식 등을 다양한 분야에서 불교미술이 발전하였다. 하지만 과 의례의 형식을 거부하고 특정 승려나 깨달음의 는 정도에 머무는 독특한 양상을 보인다. 이나 한산(寒山), 습득(拾得) 등 선승들을 그린 동자와 소를 통해 깨달음의 과정을 그린 심우도( 있다. 동아시아에서 전개된 미술이 여러 사상으로부터 다는 것은 주지의 사실이다. 그러므로 본 연구를 상이 반영된 동아시아 회화를 확인할 수 있을

To collect and evaluate an aerosol acidity (H^+) in ambient air, the cyclone/annular denuder/filter pack sampling system (ADS) was used. Aerosol acidity was collected in Chicago using the ADS for 81 12-hr samples divided in spring/summer/fall 1990 and winter 1991. This study illustrated that the ADS was suitable for measuring aerosol acidity. The 10^-5N HClO_4 extraction solution for pH determination provided more reliable scale than 10^-4N HClO_4. NH_3 should be removed prior to particle collection to accurately measure H^+ concentration on the filter. There was seasonal variation in aerosol acidity concentrations. Aerosols were more acidic in the summer. High correlations between SO_4^2- and NH_4^+, and between SO_4^2+ and H^+ were observed during the entire sampling period.

A study on acidity in precipitation was carried out during May 1990 - April 1991 at two sites in Chongwon, Choongbook. We observed variations of pH from 4.0 to 7.0. Annual mean value of pH was 5.21 in the area. In particular, strong acidity of rain fall, pH 4.0 were observed during winter to early spring. Neutral values were observed during June to July and were due to wet deposition of atmospheric pollutants by stationary fronts in the rainy season. Interestingly, acidity of snow observed in winter was neutral and it was weaker than the acidity of rain in winter by a value of 2.0. Discussion is made on meteorological and chemical analyses and seasonal variations of acidity of precipitation.