• Proceedings of the Korea Water Resources Association Conference
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• 2004.05b
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• pp.615-619
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• 2004

본 연구에서는 유출해석에 있어서 중요한 기존 설계강우의 시간분포 방법의 문제점을 해결하고 강우의 통계적 특성과 유역특성에 맞는 설계강우의 시간분포 방법을 개발하고자 하였다. 홍수량 산정지점별로 인근 관측소의 Thiessen 가중치를 부여하여 지속시간별로 호우사상을 호우 중심에 따라 4개 분위로 구분한 다음 분위별 호우사상을 무차원화 하여 누가우량곡선으로 변환한 후 산정지점별로 지속시간별 설계강우를 분포시킨다. 본 연구의 결과로 지속시간별 분위를 구분함으로써 기존 Huff의 4분위법에서 문제점으로 제시된 평활화된 무차원누가곡선으로 인한 첨두홍수량의 과소산정 등을 해결할 수 있었고, 홍수량산정지점에 대하여 지점별 대표누가우량곡선의 작성이 가능하여 현재 제시된 우량관측소별 우량주상도의 지점별 적용시 대표 우량관측소 선정 등의 어려움을 해결할 수 있이 설계홍수량 산정시 유역의 시${\cdot}$공간적 특성에 따른 강우의 특성이 최대한 반영되도록 하였다.

• Journal of the Korean earth science society
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• v.27 no.2
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• pp.209-220
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• 2006

In this study, the distribution patterns of major odorous compounds in ambient air were investigated in the areas surrounding the Ban-Wall industrial complex of Ansan, Korea (Aug. 2004 to Sep. 2005). The results indicated the environmental significance of several major odorous compounds which include carbonyl compounds, reduced sulfur compounds (RSC), and volatile organic compounds (VOC). When the results were compared on a diurnal basis, the afternoon time concentration of most odorous compounds were notably higher than their morning time counterparts. It also indicated that the odor concentrations differed greatly, in terms of spatial grouping scheme of data sets, such as between industrial area and non-industrial area. The comparison of spatial patterns indicated that the concentrations of most of the compounds at the industrial area were maintained at high concentration levels, compared to the surrounding areas. The overall results of this study thus suggest that the distribution of odorous compounds in a large industrial complex can exhibit a unique pattern of their own.

• The Journal of the Korea Contents Association
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• v.21 no.12
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• pp.791-802
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• 2021

In Korea, the cities continue to deteriorate, while the vacant houses in the small local towns emerge as a serious social problem. Despite the vacant houses emerge as a serious social problem in the small local towns as well as in the large cities, the basic researches into them are yet to be conducted on a full scale. Thus, in order to know about the spatial distribution of the vacant houses, this study conducted the square analysis and the kernel density analysis. As a result, it was confirmed that the vacant houses in Okcheon-gun had certain crowding forms and characteristics at the level of statistical significance. Next, in order to examine the distribution of the vacant houses in terms of the accessibility to the living SOC facilities, the GIS network analysis was performed, focusing on the major facilities and road networks. As a result, it was found that the better the accessibility to the living SOC facilities such as medical and well-being was, the ratio of the vacant houses was lower. In contrast, it was found that the accessibility to the obligatory facilities such as public administration and educational facilities did not have any important effects on the distribution of the vacant houses. All in all, through this study, the spatial distribution of the vacant houses in the small local town and their accessibility to the major SOC facilities could be analyzed.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.39 no.1
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• pp.29-40
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• 2021

Risk factors that threaten public safety such as crime, fire, and traffic accidents have spatial characteristics. Since each region has different dangerous environments, it is necessary to analyze the spatial pattern of risk factors for each sector such as traffic accident, fire, crime, and living safety. The purpose of this study is to analyze the spatial distribution pattern of local safety level index, which act as an index that rates the safety level of each sector (traffic accident, fire, crime, living safety, suicide, and infectious disease) for basic local governments across the nation. The following analysis tools were used to analyze the spatial autocorrelation of local safety level index : Global Moran's I, Local Moran's I, and Getis-Ord's G⁎i. The result of the analysis shows that the distribution of safety level on traffic accidents, fire, and suicide tends to be more clustered spatially compared to the safety level on crime, living safety, and infectious disease. As a result of analyzing significant spatial correlations between different regions, it was found that the Seoul metropolitan areas are relatively safe compared to other cities based on the integrated index of local safety. In addition, hot spot analysis using statistical values from Getis-Ord's G⁎i derived three hot spots(Samchuck, Cheongsong-gun, and Gimje) in which safety-vulnerable areas are clustered and 15 cold spots which are clusters of areas with high safety levels. These research findings can be used as basic data when the government is making policies to improve the safety level by identifying the spatial distribution and the spatial pattern in areas with vulnerable safety levels.

• Journal of the Economic Geographical Society of Korea
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• v.22 no.4
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• pp.513-525
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• 2019

In Seoul, the subway system has been in use since 1974 and is the most frequently used travel mode accounting for approximately 40% of passenger journeys in 2015. As such the subway system is widely adopted by people and therefore, can have great impacts on their everyday life. However, it is easily noted that transit resources are not distributed spatially uniform, in other words, not all parts of the city gain the same benefits from their networks. This study aims to examine the inequity of spatial distribution of subway networks based on accessibility. Accessibility of subway networks are calculated based on the time-distance between stations and then equity is measured using the Gini index. Resulted map of subway accessibility shows that the benefits are not evenly distributed in Seoul with a pattern of highly accessible core - less accessible periphery areas. Also the subway accessibility network has fairer distribution against the employees' distribution rather than the distribution of general population or possibly transit dependent groups.

• Journal of the Economic Geographical Society of Korea
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• v.5 no.1
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• pp.69-87
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• 2002

This study examines the spatial diffusion and locational charateristics of convenience stores in Daegu which had increased rapidly in the 1990s. The first convenience store (CVS) was introduced in the zone of transition of (Namgu district) adjacent to the city center or CBD in 1992. Thereafter they diffused into CBD and residential areas, but they have centered around places where their steady purchasing population was distributed. As a result, the spatial distribution of CVSs in Daegu shows a very uneven pattern concentrated in areas with many high school, in commercial and business areas, and apartment residential areas. It seems that this pattern is derived from two basic locational factors. Primarily, the location of CVSs in Daegu is very closely related with the spatial distribution of the demand population which will be clients for CVSs. Secondarily, it is also affected by the accessibility of streets which the demand population utilizes easily.

• Journal of the Korean Association of Geographic Information Studies
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• v.18 no.3
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• pp.89-101
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• 2015

Outbreaks of highly pathogenic avian influenza(HPAI) subtype H5N8 have occurred in Korea, January 2014 and it continued more than a year until 2015. And more than 5 million heads of poultry hads been damaged in 196 farms until May 2014. So, we studied the spatial, temporal and spatio-temporal patterns of the HPAI epidemics for understanding the propagation and diffusion characteristics of the 2014 HPAI. The results are expressed using GIS. Throughout the study period three epidemic waves occurred over the time. And outbreaks made three clusters in space. First spatial cluster is adjacent areas of province of Chungcheongbuk-do, Chungcheongnam-do and Gyeonggi -do. Second is Jeonlabuk-do Gomso Bay area. And the last is Naju and Yeongam in Jeollanam-do. Also, most of spatio-temporal clusters were formed in spatially high clustered areas. Especially, in Gomso Bay area space density and spatio-temporal density were concurrent. It means that the effective prevention activity for HPAI was carried out. But there are some exceptional areas such as Chungcheongbuk-do, Chungcheongnam-do, Gyeonggi-do adjacent area. In these areas the outbreak density was high in space but the spatio-temporal cluster was not formed. It means that the HPAI virus was continuing inflow over a long period.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2008.10a
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• pp.341-347
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• 2008

본 연구에서는 대전광역시를 대상으로 지가의 중심성을 측정 하고 분포특성을 파악하여 도시의 계획 및 관리방안을 모색하는데 필요한 기초자료로 제공하고자 한다. 지가분포에 대한 관련이론 및 선행연구를 통해 지가가 중심지에 미치는 영향을 고찰하였으며, 지가의 분포특성에 따라 중심지가 어떻게 분포 되어있는지를 파악할 수 있었다. 분석방법으로는 ArcGIS 9.2버전 Spatial Analysis를 사용하여 공간내삽(interpolation)을 통해 등치선도를 작성하여 시각화 하였으며, 축별 3차원 경향도면을 작성하여 중심지 범위를 파악하였다. 그 결과 대전광역시의 중심부이자 신시가지인 둔산지역과 구시가지인 은행동 지역이 중심지역으로 나왔으며, 이 외에 부도심지역인 유성과 신탄진 그리고 주거중심지역인 노은동으로 나타났다. 중심지 범위는 신시가지가 상당히 넓게 분포되어 있었으며, 그 외 지역은 좁게 분포되었다. 도시의 계획적 관리를 위해서는 매년 지가를 분석하여 모니터링을 한 후 야기된 문제점을 보완해야 할 것으로 사료된다. 향후 시계열적 분석을 통한 중심지의 과거 변화특성을 통해 미래의 문제점을 미리예측하고 예방할 수 있는 연구가 필요하다.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.1142-1146
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• 2008

토양수분은 지표수의 유출과정을 설명하는 과정에서 중요인자이며, 생태수문학의 핵심변수이자 기상모형의 결정적인 입력변수이다. 또한 토양수분의 공간적 시간적 특징들은 강우 및 지하수와 토양수분간의 순환 구조를 규명하는데 매우 중요하다. 본 연구에서는 산지사면의 토양수분을 체계적으로 측정하는데 필요한 시스템의 구축을 위한 기초조사 및 사전분석에 대한 연구를 수행하였다. 우수한 토양 수분 측정 장비인 TDR 장비 매설에 앞서 대상유역 선정에 대한 여러 가지 고려사항을 검토하고 수치지형 분석 등을 통한 사전분석을 실시하였다. 대상유역을 선정하기 위해서는 대상유역의 자료획득의 용이함, 지정학적, 시스템 운영적 측면에서의 가용성, 그리고 정밀측량 및 부수적요인 등 여러 요소의 고려가 요구된다. 본 연구에서는 경기도 파주시 적성면 설마리의 설마천 유역내 감악산 범륜사 우측 산지 사면을 측정대상 사면으로, 지정학적 위치, 식생분포, 지질구조 및 심도 등의 토양특성의 고려를 통해서 선정하였다. 또한 대상 사면에 흐름 발생 및 분포를 계산하기 위해서 대상사면의 지표 및 기반암 표고를 정밀 측량하였으며, 기반암 또는 풍화대까지의 깊이를 실측하여 지표면 및 지하면의 수치지형 모형을 구축하였다. 이를 대상사면 및 지하면에 대하여 표고수치지형모형(Digital Elevation Model:DEM)으로 도식한 후 흐름 발생 공간 분포를 계산하였다. 흐름발생공간분포예측은 단방향 알고리즘, 다방향 알고리즘, 흐름 분배 알고리즘 그리고 다중무한방향 알고리즘을 사용하여 지형인자인 기여사면적과 지형습윤지수를 계산하였다. 각 분배알고리즘의 의해 도출된 지형인자들로 인한 흐름발생 공간적 분포특성을 비교하였다. 이는 합리적인 토양수분 측정시스템을 구축하는데 중요한 의사결정 수단으로 판단된다.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.05b
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• pp.318-319
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• 2003

국내 도시는 1960년대이후의 산업화에 따라 인구와 산업이 도시로 집중되어 급속하고 거대한 성장을 이루었고 대기오염 현상의 다양화, 복합화로 인해 스모그와 시정장애 등 새로운 오염현상이 심각해지고 있다. 도시지역 대기중의 오염물질 농도수준은 오염 배출원의 분포 및 배출강도 그리고 지역의 지형, 기상 요인 등 많은 요인에 따라 좌우된다. 특히, 대도시는 경제ㆍ사회ㆍ문화 등 다양한 요소들이 복합적으로 상호 작용하는 유기체적인 공간으로 특정 지역에로의 집중과 분산이 일어나면서 다양한 공간구조(예; 신시가지, 산업단지 등)를 만들어 가고(이광국 등) 이런 변화에 따라 대기오염의 공간적 분포 경향 역시 달라져 갈 것이다. (중략)