KJC Korea
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It has been over 50 years since South Korea began to build the expressway. However, no research has been conducted on the main facilities of the expressway itself. I analyzed the distribution and name characteristics of expressway junctions which are considered important among main facilities by drivers. As of June 2020, the analysis results of 108 junctions are as follows. The simple total number of junctions for each route was higher for the main trunk lines, but the number of junctions per unit distance was much higher for shorter lines. By region, junctions were concentrated around major cities such as Gyeonggi and Gyeongnam, but unlike the size of area, the number of junctions relative to the population was smaller on the contrary. In word type analysis, ‘Sino-Korea’ word was 99.1%. In syllable analysis, the number of syllable was averaged 2.17 and syllable of junction names has exponential distribution. In name source analysis, junction name related to administrative district name was outstanding with 87.0%; junction names related to town･township name and city･county･district name accounted for the major of that. These characteristics are largely influenced by ‘the criteria for granting facility names’ that follows the administrative district name first.

This research investigates the impacts of artificial lights intensity, emitted from built-up area, on population estimation utilizing SNPP VIIRS DNB and land use and land cover (LULC) data. To do so, the performance comparison of population prediction for individual metropolitan cities and provinces in South Korea was made with simple regression model (SRM) consisting of two kinds of nighttime lights (NTL) intensity derived from only built-up area and all types of LULC. The SRM of urban land use was found to be superior to that of all LULC types in terms of positive correlation, model fit, statistical significance, and population prediction results. Nonetheless, according to regression diagnotics, this model was hard to satisfy the basic assumption of linearity. Therefore, it was required to refine the current model with either the adoption of polynomial or the transformation of variables to predict population in future research.

This study tried to quantitatively reveal influence of land cover and vegetation on DSM generation with statistical analysis. The forest played the most significant role in increase of elevation difference between DSM and DEM and the broadleaf tree forest exerted more influences on the difference than the needle leaf tree forest and mixed stand forest did, although there were slight variations depending on the tree type. This study suggests that low statistical relevance can be attributed to shooting problem and distortion of aerial photo, and problem associated with change in shape or location during shooting as well as shadow region. Despite of various causes to decrease statistical relevance, it can be suggested that results in this study directly reflected morphological characteristics of canopy by vegetation. With more data from this study, it is expected that characteristics of DSM and DEM can help to extract information such as forest attribute and tree type distribution.

In this study, an accuracy analysis study was conducted on the ground control points layout in photogrammetry using UAV. 17 ground control points and 13 check points were installed in the studied area, and five types of layout were created, and various spatial analysis techniques were applied by combining the performance analysis of aerial triangulation using the check points and the quantitative and qualitative analysis of the results of the ortho mosaic photo and the digital surface model. As a result of the analysis, the layout of the plane in the form of a triangle is important when placing the ground control points, but the height value of the point to be placed should also be considered. In other words, a ground control points can be installed in an optimal location to ensure higher accuracy, taking into account the overall layout and height values of the area being surveyed.

Apportionment in property valuation is to separate the market value into multiple parts. This paper aims to propose an apportionment method for single-residential houses utilizing sales price data accumulated nationwide for one year period and to discuss the applications of the resulting apportioned value tables. In order to do so, this paper reviews current practices and prior research, and then selects a building residual method for apportionment. Land value is defined as the market value where the site is cleared and fully serviced, and the value of the each site where houses are located is assesed from a computer-aided mass appraisal system that utilizes land sales prices collected nationwide as well. As a result, multiple corsstab tables are produced to report the apportioned values between land and building of single-residential houses that are categorized by building uses, regions, building structures, and years after construction. It is confirmed that the tables provide auxillary information that is useful to understand the structure of the value of the single-residential houses.

The main purpose of this study is to analyze the patterns of internal migration in small and medium-sized cities in relation to the housing market. Examining the characteristics of migration by the county level administrative units shows that major regional cities have a relatively large proportion of internal migration that migrants do not cross the administrative boundary. In theses cities, not only the ratio of apartments to total housing is high, but housing related factors are the biggest reasons for migration. The spatial patterns of internal migration were analyzed with a focus on the housing market in case of Gangneung with high internal migration. The results are as follows. First, as intensifying internal migration with the large supply of new apartments since 2014, areas where the supply of apartments was concentrated showed high level of net in-migration, while existing areas with large populations showed high level of net out-migration. Second, analysis of OD flows revealed the dominant flows from most areas of Gangneung to areas with new apartments, and the sub-flows towards large residential areas where have suffered great net outflows. Third, there was much more movement to areas with higher housing prices than origins. This study has great implications in that it not only deals with internal migration of small and medium-sized cities that have received little attention, but also reveals that their characteristics may be different from those in metropolitan or large cities.

This paper is a study on the mapping application and practice class of OpenStreetMap (OSM), a representative voluntary geographic information system in the free semester system of middle school. From the results of a performance assessment of activities undertaken by students such as editing and modifying OSM with point, line, and area cartographic elements for delineating topographic features, this research analyzes two factors: the level of OSM editing ability and map learning comprehension of each student, and the characteristic contents of each level. Being accustomed to using the Internet maps and their contents on mobile devices in their daily lives provides a robust background for supporting OSM practices in student-led instructional practices. From this study, it is expected that the educational application and its potential for increasing educational outcomes of OSM will contribute to teaching and learning with maps, emphasizing student-led instructional practice being to be increased.

At the United Nations Conference on the Standardization of Geographical Names (UNCSGN) held in New York in August 1992, South Korea and North Korea raised the justification of the name of the East Sea while raising the injustice of the name of the Sea of Japan, which is commonly used in the international community. However, in the international community, the Japanese government has denied names other than the Sea of Japan because it is the only name established in the 19th century in the West. In the meantime, debates and disputes over the East Sea and the Sea of Japan have continued. Therefore, this study investigated and analyzed the perceptions of Korean and Japanese university students on the names of the East Sea and the Sea of Japan as part of the problem-solving process. As a result, Korean university students were found to have negative images and emotions about the Sea of Japan. Also, as a standard geographical name for the international community, Korean university students prefer the East Sea, and Japanese university students prefer the East Sea/Sea of Japan. In addition, as a solution to the problem, both Korean and Japanese students responded the most to the discussion between the Korean and Japanese governments.