In an effort to interpret the characteristics of fine particle concentrations in Busan, time variations of hourly monitored concentrations PM10 (Particulate Matter with aerodynamic Diameter ≤10 ㎛) in Busan are analyzed for the period from 2000 to 2005. The characteristics of aerosol second generation formation process is also interpreted qualitatively, by using the statistical analysis of the meteorological variables including temperature, wind speed, and relative humidity. The result shows some significant annual, seasonal, weekly and diurnal variations of PM10 concentrations. In particular, seasonal(i.e., spring) variations are governed by frequency of yellow sand events even for the non-yellow sand cases where yellow-sand days are eliminated in our analysis. However, in seasonal variation, summer season predominate lower PM10 concentrations due to the frequent precipitation, and weekly and diurnal variations are both found to be reflecting the emission rate from traffic amount. Correlation coefficients between PM10 concentration and meterological variables for non-yellow sand days show overall negative correlation with visibility, wind speed, cloud amounts, and relative humidity. However for non-precipitation days, during non-yellow sand period positive correlation are found clearly with relative humidity, suggesting the importance of secondary aerosol formation in Busan that can be achieved by both homogeneous aerosol formation and heterogeneous transformations resulting from hygroscopic aerosol characteristics.

Lee, Soo-Jae. 1999. Interpreting and Processing Null Arguments in Korean Relative Clauses. Studies in Modern Grammar 15, 55-78. In interpreting and processing relative clauses in many languages the issue has been which element is relativised, a subject or an object. For instance, experimental evidence shows that it is easier to process the relative clause in which a subject is relativised rather than an object. In processing Korean relative clauses with two null arguments the issue is how to resolve the ambiguity of the two logically possible interpretations: either null subjects are coreferential with matrix subjects and null objects are relativised or null objects are coreferential with matrix subjects and null subjects are relativised. By providing various cues I will demonstrate that Huang`s claim that null objects cannot be coreferential with matrix subjects cannot be supported in Korean. In Korean (though not in Chinese) null objects in relative clauses are very flexible in interpretation.