• 한국지역지리학회지
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• 제3권2호
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• pp.1-17
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• 1997

지리정보시스템은 지방정부의 행정에 있어서 공간분석과 정책결정에 매우 유용한 도구로 등장하였다. 충청남도는 지리정보체계의 유용성을 인식하여 그것의 도입과 개발에 박차를 가하고 있다. 그러나, 개발의 초기단계에서 흔히 그러하듯이 기술력과 전문인력의 부족, 재원의 한계로 말미암아 어려움에 봉착하고 있다. 본 연구는 충청남도 지리정보시스템의 추진현황과 여건을 감안하고 여러 나라와 우리나라의 경험적 사례로부터 시사점을 얻어 충남지리정보체계 구축의 과제를 선정하였으며 지역 실정에 맞는 개략적인 지리정보체계의 개념설계를 시도함과 동시에 추진전략을 제시하였다. 지리정보체계를 성공적으로 구축하는 데에는 무엇보다도 다음과 같은 선결조건 흑은 과제의 충족이 요구된다. 첫째, 합리적인 장기계획을 수립하고 그 계획에 의거하여 체계적인 절차에 따라 지리정보계제를 구축하여야 한다. 둘째, 지리정보체계의 추진주체를 선정하고 조직을 정비하는 일이다. 이는 지리정보체계의 구축을 적극적으로 추진하고 책임의 소재를 명확히 할 필요가 있기 때문이다. 가칭 '지역계발정보화 추진위원회'의 구성과 지리정보를 위주로 하는 '지역개발정보센터'의 설립이 요망된다. 셋째, 국가지리정보체계와 기타 국가수준의 응용시스템과의 연계방안과 그들의 수용방안을 모색함으로써 비용과 노력의 중복을 방지하여야 한다. 넷째, 위성측위시스템(GPS)과 같은 신기술을 활용하여 정확한 지도작성을 하는 일이 시급하다. 다섯째, 우수한 인력을 자체내에서 지속적으로 확보하기 위해 인력양성 프로그램을 마련하는 일이 병행되어야 한다.

• 한국지리정보학회지
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• 제15권3호
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• pp.119-136
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• 2012

본 연구는 IPCC(Intergovernmental Panel on Climate Change)에서 제시한 기후변화 취약성 개념을 서울시에 적용, 적정 홍수 취약성 지표 산정 및 퍼지모형을 활용하여 기후변화 분야 중 홍수취약성을 평가하고 GIS를 이용하여 취약성도를 작성하였다. 이를 위해 선행연구를 기반으로 지표를 도출하였다. 도출된 지표는 기후노출(일 최대 강수량, 일강수량 80m 이상인 날 수), 민감도(침수지역, 경사, 지질, 고도, 하천으로부터의 거리, 지형, 토양 및 불투수면적) 및 적응능력(홍수조절능력, 자연녹지, 공원녹지) 등의 자료이며, 이를 GIS 기반의 공간데이터베이스로 구축하였다. 구축된 지표값들을 통합하기 위한 방법으로 퍼지모형을 활용했으며, 퍼지소속값 결정을 위해서는 빈도비를 활용하였다. 2010년 침수 발생 자료를 활용하여 항목들간의 상관관계 및 퍼지소속값을 산정하였으며, 2011년 침수 발생 지역으로 작성된 취약성도를 검증하였다. 분석결과 서울지역 홍수피해에 크게 영향을 미치는 지표는 일강수량이 80mm이상인 날수, 하천과의 거리, 불투 수층으로 나타났다. 서울의 경우, 최대강수량이 269mm 이상일 때 적응능력(유수지, 녹지)이 부족하고, 고도가 16~20m 정도이며 하천에서 50m이내에 인접한 지역, 공업용지에서 홍수취약성이 매우 높은 것으로 나타났다. 지역적으로 영등포구, 용산구, 마포구 등 한강 본류의 양안에 위치한 구들이 비교적 취약지역을 많이 포함하고 있는 것으로 나타났다. 본 연구는 기후변화 취약성 평가의 개념을 적용하고, 방법론으로 퍼지모형을 활용함으로써 기존의 취약성 평가기법을 개선하였으며 평가결과는 홍수예방정책에 대한 우선지역 선정과 의사결정의 주요한 근거로 활용될 수 있을 것으로 기대된다.

• The Plant Pathology Journal
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• 제23권2호
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• pp.62-69
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• 2007

Twenty-nine isolates of Fusarium solani, originally isolated from diseased cotton roots in Egypt, were evaluated for their ability to cause symptoms on four genetically diverse cotton cultivars. Analysis of variance showed highly significant variance among cultivars, and isolates as well as the isolate x genotype interactions were highly significant(p < 0.0001). Although most isolates showed intermediate pathogenicity, there were two groups of isolates that showed significant differences in pathogenicity on all four cultivars. None of the cultivars were found to be immune to any of the isolates. On all cultivars, there were strong significant positive correlations between dry weight and each of preemergence damping-off, survival, and plant height. Considering 75% similarity in virulence, two groups comprising a total of 29 isolates were recognized. Ninety-three percent of the isolates have the same pathogenicity patterns with consistently low pathogenicity, and narrow diversity of virulence. Isolates Fs4 and Fs5 shared the same distinct overall virulence spectrum with consistently high pathogenicity. There was no clear-cut relationship between virulence of the isolates based on reaction pattern on 4 cultivars and each of host genotype, previous crop, and geographic origin.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume II
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• pp.876-879
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• 2006

This study was performed for developing the National Environmental Assessment Map (NEAM) in Korea and presenting the application method of NEAM. This NEAM adopted the least indicator method and uses a Geographic Information System (GIS). This map is made through evaluation of 67 items, including greenbelt status and biodiversity. As a result, the construction of NEAM was defined as a process of identifying land use to scientifically assess the physical and environmental value of land and classify conservation value into several grades for the sustainable management of environmental resources. After applying NEAM criteria of five degrees to the whole of Korea, Grade I, showing the highest conservation value, accounted for 45.6% by land area of NEAM. Grades II, III, IV, and Ⅴlikewise accounted for, respectively, 23.6%, 17.9%, 6.3%, and the lowest conservation value of 6.6%. This map can be widely used in, for example, urban and regional planning, development planning, and environment impact assessment.

• Bulletin of the Korean Chemical Society
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• 제30권10호
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• pp.2287-2293
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• 2009

Gas Chromatography-Mass Spectrometry (GC-MS) fingerprint analysis, Principle Components Analysis (PCA), and Hierarchical Cluster Analysis (HCA) were introduced for quality assessment of Curcuma longa L. (C. longa). The GC-MS fingerprint method was developed and validated by analyzing 33 batches of samples of C. longa from different geographic locations. 18 chromatographic peaks were selected as characteristic peaks and their relative peak areas (RPA) were calculated for quantitative expression. Two principal components (PCs) were extracted by PCA. C. longa collected from Guizhou and Fujian were separated from other samples by PC1, capturing 71.83% of variance. While, PC2 contributed for their further separation, capturing 11.13% of variance. HCA confirmed the result of PCA analysis. Therefore, GC-MS fingerprint study with chemometric techniques provides a very flexible and reliable method for quality assessment of C. longa.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.801-803
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• 2003

In this paper, we present a method for generating and providing spatially encoded video data that can be effectively used by GIS applications. We collect the video data by a mobile mapping system called 4S-Van that is equipped by GPS, INS, CCD camera, and DVR system. The information about spatial object appearing in video, such as occupied region in each frame, attribute value, and geo-coordinate, are generated and encoded. We suggest methods that can generate such data for each frame in semi-automatic manner. We adopt standard MPEG-7 metadata format for representation of the spatially encoded video data to be generally used by GIS application. The spatial and attribute information encoded to each video frame can make visual browsing between map and video possible. The generated video data can be provided and applied to various GIS applications where location and visual data are both important.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.783-785
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• 2003

In recent years, the use of video in GIS is considered to be an important subject and many related studies result in VideoGIS. The virtual navigation is an important function that can be applied to various VideoGIS applications. For virtual navigation by video, the following problems must be solved. 1) Because the video route may be not exactly coincided with route that user wants to navigate, parts of several video clips may be required for single navigation. Virtual navigation should allow the user to move from one video to another at the proper position. We suggest the video segmentation method based on geographic data combined with video. 2) From a point to a destination, the change frequency of video must be minimized. The frequent change of video make user to mislead navigation route and cause the wasteful use of computing resource. We suggest methods that structure video segments and calculate weight value of each node and link.

• 대한원격탐사학회지
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• 제37권6_3호
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• pp.2001-2010
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• 2021

본 연구의 목적은 아리랑 영상의 정사영상처리를 보다 효율적으로 개선하기 위한 것이다. 국내외 지구 관측 위성의 개발이 가속화됨에 따라 획득되는 영상의 수와 양이 급증하고 있다. 이에 획득된 영상에 대한 정사영상처리를 보다 빠르고 효율적으로 개선하기 위한 다양한 연구들이 진행되고 있다. 본 연구에서는 GPU 등 하드웨어 컴퓨팅 능력 향상을 제외하고, 알고리즘 개선을 통한 처리 효율 강화에 집중하였다. 이를 위하여 LUT 기반 RFM 방법으로 알고리즘을 개선하였으며, offset 설정에 따라 달라지는 결과를 정확도 및 시간 효율의 측면에서 비교 및 분석하였다.

• Journal of Positioning, Navigation, and Timing
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• 제11권2호
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• pp.83-89
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• 2022

For precise GNSS applications, the antenna phase center correction (PCC) is absolutely required. The PCC magnitude can reach the centimeter level with the antenna structure. In the present study, we first investigate the phase center offset (PCO) and phase center variation (PCO) of three different antenna models in two different reference frames, IGS08/igs08.atx and IGS14/igs14.atx. Clear L1 and L2 PCO differences were found between IGS08 and IGS14. In addition, the PCV showed characteristics that is dependent upon the signal direction (azimuth and elevation angle). The remarkable thing is that the changes of a Dorne Margolin choke-ring antenna model (AOAD/MT DOME) was very small in two reference frames. In order to analyze changes in positions according to different reference systems, GNSS data obtained from DAEJ, SUWN, and TSKB stations were processed by the precise point positioning (PPP) method. We suggest that an antenna PCO/PCV can affect the precise GNSS positioning on the order of several millimeters in two different reference frames.

• 한국환경보건학회지
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• 제48권6호
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• pp.298-305
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• 2022

Background: The concentration of air pollutants as measured by the Air Quality Monitoring System (AQMS) is not an accurate population exposure level since actual human activities and temporal and spatial variability need to be considered. Therefore, to increase the accuracy of exposure assessment, the population should be considered. However, it is difficult to obtain population data due to limitations such as personal information. Objectives: The existing population defined in this study is the number of people in each region's grid. The purpose is to provide a methodology for evaluating exposure to PM_2.5 through existing population data provided by the National Geographic Information Institute. Methods: The selected study period was from October 26 to October 28, 2021. Using PM_2.5 concentration data measured at the Sensor-based Air Monitoring Station (SAMS) installed in Guro-gu and Wonju-si, the concentration for each grid was estimated by applying inverse distance weights through QGIS version 3.22. Considering the existing population, population-weighted average concentration (PWAC) was calculated and the exposure level of the population was compared by region. Results: The outdoor PM_2.5 concentration as measured through the SAMS was high in Wonju-si on all three days. Wonju-si showed an average 22% higher PWAC than Guro-gu. As a result of comparing the PWAC and outdoor PM_2.5 concentration by region, the PWAC in Guro-gu was 1~2% higher than the observed value, but it was almost the same. Conversely, observations of Wonju-si were 10.1%, 11.3%, and 8.2% higher than PWAC. Conclusions: It is expected that the Geographic Information System (GIS) method and the existing population will be used to evaluate the exposure level of a population with a narrow activity radius in further research. In addition, based on this study, it is judged that research on exposure to environmental pollutants and risk assessment methods should be expanded.