The purpose of the present study is to elucidate the underlying structure of the Korean urban system and classify urban centers on the basis of relative dimentionality. In addition, and most important of all, this study aims to scale Korean cities according to Berry's schema (1969, 1972). The present study comprises 34 variables such as population, household, housing conditions, age structure, occupational-industrial structure, standard of living and so on (Table 3). Data were collected for 35 cities in Korea with a population of 50 thousand or over. The use of a principal axis factor model revealed that 82 percent of the variation among the cities described by 34 variables can be expressed by 9 factors having an eigenvalue of greater than unity (Fig. 2). The main factors are identified as representative of urban population size, contrasts between rural centers and modern urban centers, housing conditions, age structure, population migration, and contrasts between educational centers and stagnant small trade centers. Factor 1 indicates urban economic base and urban population size concomitantly. It provides a concise statement of economic differentiation between larger urban centers and smaller regional centers having a population of about 50 thousand (Tables 3 and 4). Factor 2 is identified as representative of the contrasts between rural traditional centers (rural urban areas) and larger urban centers having modern elements. The larger urban centers are shown to have higher population increase and greater proportion of the active age-groups. Such phenomena are also closely related to manufacturing activites indicating mordern elements in Korean urban society. The rural traditional centers Korea can be charaterized by high birth rates, high natural increase, high death rates and high proportion of old age group. Traditional characteristics remain in the small centers as they were found in Chile (Tables 3 and 4). Factor 3 is interpreted as housing conditions. It means that the six largest urban centers such as Seoul, Busan, Daegu, Incheon, Gwangjon Daejon and other manufacturing centers attract workers at the age between fifteen and fifty-nine. As a result, it gives rise to urban problems such as overcrowding, higher housing shortage and high population increase. This is the influence of industrialization, without regard to other industry that creates urban problems in the larger urban centers. In contrast, the small urban centers are characterized by the age group and higher proportion of farm household. This factor corresponds closely with the second factor describing traditionalism of small urban centers (Tables 3 and 4). Factor 4 can be labelled as age structure. It identifies the movement of youth at the age between fifteen and twenty-four and the active age group of between fifteen and fifty-nine from the small urban centers and rural areas to larger urban centers with the advantages of manufacturing, education, commerce and other services. The five largest Korean cities and industrial centers are good examples in this respect. In contrast to this urban centers are those small urban centers showing high infant groups between the age of zero_??_fourteen. Owing to the lack of suitable data, it is difficult to give a clear affirmation. However, a combination of socioeconomic status and age structure is assumed to be the same as shown in Yugoslavia. Accordingly, Factor 4 reveales the traditionalism of the small urban centers nearly identical to the second and third factor (Tables 3 and 4). In factor 5 which indicates migration, larger urban centers, such as Seoul, Busan, Incheon and satellite cities of Seoul are shown to have higher social increase, higher proportion of construction workers, , higher population increase during the period between 1966 and 1971.
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