In particular, economic development projects in the capital area have drawn many rural migrants to urban areas. The urbanization ratio of Korea increased from 39.1% in 1960 to 90.5% in 2008, corresponding to the rapid population increase from 25,012,000 to 48,875,000 (Table 1). In recent years, urban expansion has accelerated in the capital city area, leading to a regionalization phenomenon in which approximately half of the nation's population now lives in Seoul and nearby metropolitan areas (Kim and Sakong, 2006).