• 한국환경복원기술학회지
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• 제17권1호
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• pp.135-146
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• 2014

The improvement of adaptation capability against heat island (ACHI) by greening buildings is considered as an important measure to cope with a climate change. This study aimed to select the most appropriate zones for green roof initiative in case study sites, Bucheon, Anyang, and Suwon Cities and to investigate the characteristics of buildings for greening to improve ACHI. Relative ACHI for each lot was estimated from 0 to -9, assuming that it decreases with the distance from green space and waterbody. Low adaptation capabilities were mostly shown in the old urban blocks with dense low-rise buildings and lack of green space. Three blocks with the lowest ACHIs were chosen as a green roof initiative zone in each city. They are largely residential areas including low-rise buildings such as single, multi-household houses, townhouses, 5 or lower story apartments and few are industrial areas crowded with small factory buildings. The areas of building roof available for greening are 8.8% within the selected zones in Bucheon City, 5.3% in Anyang City, and 4.9% in Suwon City. As it were, 25.2~41.7% of the roof top areas are available for greening in these zones. It means that roof top areas of $25,000{\sim}120,000m^2$ can be used for greening within the selected zones of $0.64{\sim}1.65km^2$ to improve ACHI. The approach and results of the study are significant to provide a logical basis and information on location, scale, effect, and target figure of greening as a measure to cope with climate change.

• 대한원격탐사학회지
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• 제35권4호
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• pp.617-623
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• 2019

Numerous water disasters have recently occurred all over the world, including South Korea, due to global climate change in recent years. As water-related disasters occur extensively and their sites are difficult for people to access, it is necessary to monitor them using satellites. The Ministry of Environment and K-water plan to launch the next-generation medium satellite No. 5 (water resource/water disaster satellite) equipped with C-band synthetic aperture radar (SAR) in 2025. C-band SAR has the advantage of being able to observe water resources twice a day at a high resolution both day and night, regardless of weather conditions. Currently, RADARSAT-2 and Sentinel-1 equipped with C-band SAR achieve the purpose of their launch and are used in various environmental fields such as forest structure detection and coastline change monitoring, as well as for unique purposes including the detection of flooding, drought and soil moisture change, utilizing the advantages of SAR. As such, this study aimed to analyze the characteristics of the next-generation medium satellite No. 5 and its application in environmental fields. Our findings showed that it can be used to improve the degree of precision of existing environmental spatial information such as the classification accuracy of land cover map in environmental field works. It also enables us to observe forests and water resources in North Korea that are difficult to access geographically. It is ultimately expected that this will enable the monitoring of the whole Korean Peninsula in various environmental fields, and help in relevant responses and policy supports.

• The Korean Journal of Ecology
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• 제27권4호
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• pp.245-256
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• 2004

Simple Biosphere model 2(SiB2)는 전구기후모형 (global climate model)의 지표면모형으로서 토양-식생-대기 사이의 에너지, 물 및 이산화탄소 교환을 모의한다. 특히 광합성-기공전도 하부모형을 포함하고 있어, 식물군락의 광합성과 기공개폐기작을 근거로 하여 이산화탄소 동화량 및 물의 증산량을 계산한다. 따라서 SiB2 수치실험 결과를 통해, 육상생태계에 있어서의 이산화탄소 순환, 물수지, 그리고 환경과 식물군락간의 상호관계를 분석할 수 있다. 본 종설은 일례로서 개량된 SiB2-Paddy를 이용하여, 다양한 식생 및 토지 이용을 보이는 태국 챠오플라야강 유역의 하천유출량 변화에 관한 연구를 소개한다. 이는 SiB2 수치실험결과가 지표면 식생의 차이에 따른 유출량의 변화를 예측 가능하며, 이를 통하여 육상생태계에 있어서 식생이 갖는 기능적인 측면을 연구하는데 적합한 모형임을 알 수 있었다. 그러나 SiB2모형을 이용하여 더욱 정확도 높은 육상 생태계 모의를 위해서는 토양호흡, 엽면적지수, 식물군락간 경쟁 그리고 뿌리의 분포를 고려한 토양수분 등을 모의할 수 있는 하부모형의 도입이 필요하다.

• 한국GIS학회:학술대회논문집
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• 한국GIS학회 1995년도 추계학술대회 발표요약문
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• pp.22-32
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• 1995

본 연구의 목적은 경안천 유역의 토지이용 및 식생의 활력도를 살피고, 각 시점에서의 토양유실량을 추계하며, 토지이용변화에 따른 토양유실 변화량의 증감을 분석하는데 있다. 토양유실량은 토양유실량예측공식(USLE)을 이용하여 산정하였는데 경안천이라는 광역적인 유역의 토양유실을 분석하기 위하여 GIS기법과 원격탐사기법을 동시에 이용하였다. 경안천 유역의 토지이용 및 식생활력도변화 분석뿐만이 아니라 토양유실량의 정확한 산정은 유역환경의 질에 영향을 미치는 매우 중요한 인자들이 무엇인지를 분석케 하였다. 즉 식생, 경사도 및 사면장 그리고 토양보전과 관련된 인자들에 대한 관리는 하천유역의 보전 및 토양유실의 저감에 중요한 역할을 함을 알 수 있었다. GIS기법을 응용한 본 연구는 계획가들에게 있어서 하천유역의 토지이용의 변화와 토양유실량의 상관성을 파악하게 해줌으로서 앞으로의 유역내의 장기적인 토지이용계획 수립시 매우 합리적인 지침을 제시해 줄 것으로 기대된다.

• 대기
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• 제29권2호
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• pp.131-147
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• 2019

On the urban scale, Micro-climate analysis models for urban scale have been developed to investigate the atmospheric characteristics in urban surface in detail and to predict the micro-climate change due to the changes in urban structure. BioCAS (Biometeorological Climate Impact Assessment System) is a system that combines such analysis models and has been implemented internally in the Korea Meteorological Administration. One of role in this system is the analysis of the health impact by heat waves in urban area. In this study, the vegetation cooling models A and B were developed and linked with BioCAS and evaluated by the temperature drop at the vegetation areas during ten selected heat-wave days. Smaller prediction errors were found as a result of applying the vegetation cooling models to the heat-wave days. In addition, it was found that the effects of the vegetation cooling models produced different results according to the distribution of vegetation area in land cover near each observation site - the improvement of the model performance on temperature analysis was different according to land use at each location. The model A was better fitted where the surrounding vegetation ratio was 50% or more, whereas the model B was better where the vegetation ratio was less than 50% (higher building and impervious areas). Through this study, it should be possible to select an appropriate vegetation cooling model according to its fraction coverage so that the temperature analysis around built-up areas would be improved.

• 한국지리정보학회지
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• 제12권4호
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• pp.34-47
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• 2009

급속한 도시화는 환경 생태적 훼손과 난개발, 사회 경제적 문제를 야기시키고 있다. 도시화에 따른 문제 해결과 친환경적이고 효율적인 국토개발을 위해서는 도시성장 현황과 특성을 파악하고, 이를 반영하여 정책을 수립하는 것이 중요하다. 본 연구는 기존의 지역단위가 아닌 우리나라 전체를 대상으로 도시성장에 대한 지난 20년간의 현황과 특성을 분석하여 도시정책을 수립함에 있어 기초자료로 활용하고자 한다. 이를 위해 환경부에서 제작한 1980년대, 2000년대 토지피복지도를 이용하여 도시지역을 추출한 후 GIS와 통계적 기법을 이용하여 행정구역 위계별 도시성장 패턴분석을 실시하였다. 그 결과, 1980년대 이후 개발지역 면적이 1980년대 이전 대비 2.5배 확대되었으며 특히, 수도권인근농촌은 21.2배가 증가하였다. 특별시와 광역시는 고도가 낮고, 간선도로와 주요 도심과 가깝고, 도로율이 높고, 환경 생태적 및 법제적 제한이 있는 지역에 개발되었으며, 산림과 초지에서 도시적 토지로 전용되었다. 반면, 대도시인근농촌, 수도권인근농촌, 지방농촌은 고도가 높고, 간선도로와 주요 도심과 멀고, 도로율이 낮으며, 환경 생태적 및 법제적 제한이 없는 지역에 개발되었으며, 농지에서 도시적 토지로 전용되었다. 즉, 대도시를 중심으로 한 도시성장이 팽창함에 따라 가용토지의 부족 및 각종 규제와 정책으로 도시 외곽지역에서 불리한 지형적 조건에도 불구하고 도시개발이 활발이 이루어졌음을 알 수 있다.

• 농업과학연구
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• 제45권3호
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• pp.521-532
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• 2018

In recent decades, the dry stream phenomena of small and medium sized rivers have been attracting much attention as an important social problem. To prevent dry stream phenomena, it is necessary to build an infrastructure that manages rivers. To accurately determine the progress of dry stream phenomena, it is necessary to continuously measure the discharge and other hydrological factors for small and medium sized rivers. However, until now, the flow data for small and medium rivers in Korea has been insufficient. To overcome the lack of supporting data for supporting rational decision-making in policy and project implementation, a short- and long-term hydrological model was developed that takes into consideration hydrological changes such as the increase of the impervious area due to urban development and groundwater pumping, the construction of a large-scale sewage treatment plant, the maintenance of stream-oriented rivers, etc. In the developed model, the distributed grid is represented by three layers: Surface flow, interflow, and groundwater flow. The surface flow and intermediate flow flowed along the flow direction, and the groundwater flow was calculated by a two-dimensional groundwater analysis model such that the outflow occurred in all directions without a specific flow direction. The effects of land use and cover on evapotranspiration and infiltration and the effects of multiple landscapes can be simulated in the developed model.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.460-464
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• 2002

Multitemporal interferometric SAR has became an useful geodetic tool for monitoring Earth's surface deformation, generation of precise DEM, and land cover classification even though there still exist certain constraints such as temporal and spatial decorrelation effects, atmospheric artifacts and inaccurate orbit information. The Korea where nearly all areas are heavily vegetated, JERS-1 SAR has advantages in monitoring surface deformations and environmental changes in that it uses 4-times longer wavelength than ERS-l/2 or RADARSAT SAR system. For generating differential SAR interferogram and differential coherence image fer deformation mapping and temporal change detection, respectively, topographic phase removal process is required utilizing a reference inteferogram or external DEM simulation. Because the SAR antenna baseline parameter for JERS-1 is less accurate than those of ERS-l/2, one can not estimate topographic phases from an external DEM and the residual phase appears in differential interferogram. In this paper, we examined topographic phase retrieval method utilizing an external DEM. The baseline refinement is carried out by minimizing the differences between the measured unwrapped phase and the reference points of the DEM.

• 환경영향평가
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• 제21권5호
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• pp.781-787
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• 2012

The purpose of this study was to analyze the landscape changes at Su-ji and Gi-heung in Young-in city using FRAGSTATS Model. Landscape Indices obtained by this model can explain the structural change of urban green zone and fragmentation resulting from development. As results of this study, Gi-heung showed worse quality of landscape in 2007, comparing 2000. However, in Su-ji, there were several better landscape indices in the same 2007/2000 comparison, even though the little shrinking of green zone and separation of core area. It could assume that the reason was caused by conservation policy of urban green zone. This study could provide the useful methods for finding the problems and searching the alternatives considering the development of urban green zone.

• 한국측량학회지
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• 제30권2호
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• pp.189-197
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• 2012

This research attempted to find possibilities of the practical use utilizing geospatial methods for the balanced promotion of sustainable coastal development and preservation through a case study of Jekyll Island, one of Georgia's barrier islands. In response, this research provided ways for practical use in sustainable development and preservation plans. First this research thoroughly investigated the 1996 master plan of Jekyll Island and tried to recalculate developed and undeveloped areas. Second, new estimations for developed areas were investigated through field survey. Third, this research proposed the use of the satellite images with different levels of spatial resolutions and tested different classification schemes to find possibilities for practical use. For these purposes, first, we classified developed and undeveloped features by manual digitization using an aerial photo image with 0.5m spatial resolution. Second, a Landsat 7 ETM+ and a QuickBird satellite images with mid- and high-levels of spatial resolutions were applied to identify developed and undeveloped areas using both the National Land Cover Data (NLCD) and the Coastal Change Analysis Program (CCAP) classification schemes. Also, GEOBIA (Geographic Object-Based Image Analysis) was conducted to accurately identify developed and undeveloped areas.