• 대한공간정보학회지
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• 제23권1호
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• pp.23-29
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• 2015

본 연구에서는 위치기반 소셜 미디어 데이터의 공간적 분포가 지역별 부동산 지수와 어떠한 공간적 관련성을 가지는지에 대해 알아보고자 한다. 두 데이터는 상이한 자료 형식을 가지고 있어, 이를 보완할 수 있는 방법론으로 본 연구에서는 격자 기반의 공간분석 방법을 적용하였다. 대상 데이터로는 2013년 8월 한 달간의 지오태그된 트윗 데이터와 행정구역별 주택가격지수(매매, 전세)를 이용하였으며, 공간적 범위는 서울과 수도권 일부를 포함하도록 하였다. 두 데이터 간의 상이한 공간적 단위를 고려하여 2,000m 단위의 격자망을 구성하고 이에 맞게 두 데이터를 격자 데이터 형태로 변환하였다. 변환된 두 데이터에 대하여 Hot spot 분석을 실시하여 공간적 분포를 시각적으로 비교하였으며, 공간시차를 고려한 이변량 공간적 상관계수를 측정함으로써 정량적 분석을 실시하였다. 시각적, 정량적 분석 결과, 서초구 지역이 트윗 데이터와 주택매매가격지수 데이터에서 공통적인 Hotspot 지역으로 탐색되었으나 주택전세가격지수 데이터와는 뚜렷한 공간적 상관성이 탐색되지 않았다.

• 교육시설 논문지
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• 제18권4호
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• pp.57-67
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• 2011

In this study, it did comparative analysis on the arrangement, construction and size of rooms applied in the early design stage at the time of prize-winning with the changed ground plans in the final design of those prize-winning works in design contests and BTL hold since 2007 for middle and high schools in Gyeonggi, Daejeon, Chungcheong regions. Through the analysis, this study intends to present those matters to be changed in the facilities standards of each local education office so that it can be referred to the assessment of spatial construction and proper size being planned in the future for middle and high schools and reflected flexibly in consideration of various educational conditions and characteristics of schools by regions. Furthermore, it has the objective to play a part for the establishment of much better environment of educational facilities by provision of reference materials to those matters being changed into proper ones not into the minimum ones of the school facilities standards as the national level. For case analysis, it analyzed various rooms classified by necessary spaces. Since names of rooms and spatial constructions to constitute facilities are different from each local education office and also the analysis by each room has some limitation in the changes and improvement of rooms for a wide range, it proceeded with detailed classifications of school building facilities by each necessary space.

• Journal of Ecology and Environment
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• 제47권3호
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• pp.75-84
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• 2023

Background: Knowledge of the spatial trends of plant invasions in different habitats is essential for a better understanding of the process of these invasions. We examined the variation in invasive alien plant species (IAS) richness and composition at two spatial scales defined by elevation and habitat types (roadside, forest, and cultivated lands) in the Makawanpur district of Nepal. Following an elevation gradient ranging from 500 to 2,400 m asl along a mountain road, plant species cover was recorded within sample plots of size 10 m × 5 m. Systematic random sampling was adopted in every 100 m elevation intervals on three habitat types. Results: Altogether 18 invasive alien plants belonging to eight families were recorded within 60 plots, of which 14 species (representing 80%) were from tropical North and South America. The most common plants by their frequency were Ageratina adenophora, Chromolaena odorata, Bidens pilosa, Lantana camara, and Parthenium hysterophorus. We found a significant relationship between species composition and elevation in the study area. Low-elevation regions had a higher number of alien species as compared to high-elevation regions within different habitat types. Conclusions: The species richness and density of IAS were higher in the road site followed by the cultivated land and forest sites. This pattern occurred throughout the elevation range and habitats. IAS were found mostly in the open land with high sunlight availability. Information from such scientific assessment of invasive alien plants will assist in developing appropriate management plans in the Makawanpur district.

• 대기
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• 제28권3호
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• pp.337-355
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• 2018

Ultrafine particles (< 100 nm in diameter, UFP) are known to be more toxic per unit mass than larger particles and contribute to more than 90% in particle number concentrations in urbanized cities but much less in mass. The major sources of UFP are vehicle emissions in urban areas. Due to their tiny size (the sizes of UFP from vehicle emissions range from 10 to 60 nm depending on engine and fuel types), inhaled UFP can reach the deepest area of respiratory track (e.g., pulmonary alveoli) as well as all of the body via lymph and blood circulation causing various adverse health effects. This article reviews the sources and emission factors of UFP, temporal and spatial distributions in urban areas and their health effects reported by toxicological and epidemiological studies. We also compared the levels of UFP concentrations measured in other countries with those in Korean cities to evaluate the public exposure to UFP in Korea. Ultimately, we expect this study can contribute to developing the risk assessment techniques for public exposure to UFP in the urbanized cities in Korea.

• 대한원격탐사학회지
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• 제37권5_2호
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• pp.1229-1234
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• 2021

GOCI의 임무를 승계한 GOCI-II가 2020년 2월 성공적으로 발사되어 운영 중에 있다. GOCI-II는 향상된 공간해상도 및 분광해상도, 늘어난 관측시간과 전구 관측 모드 추가 등을 통해 연안 해수환경의 미세한 변화를 포함하여 폭 넓은 분야에서 활용성이 클 것으로 기대된다. 본 특별호는 발사 및 자료공개 후 1년이 지난 현재의 GOCI-II 자료 품질을 점검하고, 정확도 향상 및 활용 방안 관련 연구결과를 소개한다. 이를 통해 GOCI-II 자료가 해양은 물론 육상, 기상의 다양한 분야에서 활발히 활용되는 계기가 되기를 기대한다.

• 한국농림기상학회지
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• 제18권3호
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• pp.170-178
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• 2016

농업부문의 기후변화 적응은 농작물의 생육과 수량에 미치는 기후변화 영향의 정량평가로부터 시작된다. 이를 위한 조건으로서 작물모형 외에 과거-미래 간 이음새 없는 기후자료가 필요하지만, 기후시나리오에서 산출된 과거 기간의 자료는 실측 기후와 차이가 난다. 이것을 보정 없이 작물모형 구동에 사용한다면 농작물의 생육과 수량예측이 현실과 동떨어진 것이 되어 모의결과를 바탕으로 마련된 적응대책은 실효성이 낮아진다. 또한 동일한 기후시나리오를 사용자에 따라 서로 다른 시공간적 상세화 작업이나 기후모델의 편의보정을 위한 후처리 작업을 수행한다면 작물모형 구동결과는 달라질 수 있다. 농업부문에서 불확실성을 최소화한 영향평가결과를 도출하기 위해서는 먼저 최종 사용자의 목적에 적합한 공간적 및 시간적 규모를 설정하는 일이다. 나아가 과거기후의 재현성을 포함한 시나리오기후의 불확실성을 정확히 파악하여 영향평가결과의 불확실성을 정량적으로 제시할 수 있어야 한다. 이 논문에서는 기후시나리오의 농업분야 활용과정에서 발생할 수 있는 불확실성을 요인별로 추적하고, 이를 줄이기 위한 자료처리기법을 소개하며, 연구목적에 따른 최적 시나리오 자료를 추천함으로써 기후변화 적응을 위한 기초정보를 제공하고자 하였다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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• pp.397-400
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• 2007

For mapping the distribution of heavy metals in the mining area, field spectroscopy and hyperspectral remote sensing were used in this study. Although heavy metals are spectrally featureless from the visible to the short wave infrared range, possible variations in spectral signal due to heavy metals bound onto minerals can be explained with the metal binding reaction onto the mineral surface. Variations in the spectral absorption shapes of lattice OH and oxygen on the mineral surface due to the combination of heavy metals were surveyed over the range from 420 to 2400 nm. Spectral parameters such as peak ratio and peak area were derived and statistically linked to metal concentration levels in the streambed samples collected from the dry stream channels. The spatial relationships between spectral parameters and concentrations of heavy metals were yielded as well. Based on the observation at a ground level for the relationship between spectral signal and metal concentration levels, the spectral parameters were classified in a hyperspectral image and the spatial distribution patterns of classified pixels were compared with the product of analysis at the ground level. The degree of similarity between ground dataset and image dataset was statistically validated. These techniques are expected to support assessment of dispersion of heavy metal contamination and decision on optimal sampling point.

• 한국환경복원기술학회지
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• 제23권6호
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• pp.29-41
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• 2020

Wild pollinators provide important pollination services for crops. However, their geographical ranges and impact on pollination services have not been fully explored within the scope of Korean agricultural land. This study aims to identify spatial supply-demand mismatches across orchard fields in the context of assessing pollination service risk. We first used National Ecosystem Survey data and a species distribution model (MaxEnt) to develop the geographic range of each of 32 wild pollinators belonging to three families (Diptera, Hymenoptera, and Lepidoptera). We then summed the modeled presence probability of each species to obtain a measure of spatially explicit pollinator richness. This modeled richness, defined as pollination supply, was compared with the summed area of orchard fields at the municipal boundary level to identify areas with supply-demand mismatches. The study found that Lepidoptera showed the highest species richness (8.3±1.5), followed by Hymenoptera (4.3±0.8) and Diptera (3.5±0.8) species. Median orchard area was 1.5 ㎢ (range of 0-176.7 ㎢) among 250 municipal regions in South Korea. The municipal regions were divided into three categories (tertiles) of low, middle, and high pollination supply and demand according to, respectivley, average polliator richness and orhard area. Finally, we found that 55 municipal regions (accounting for 49% of national orchard land) potentially faced high risk of pollination deficits, 81 regions (48% of national orchard land) faced intermediate risk, and 63 regions faced low risk (3% of national orchard land). In conclusion, this study revealed significant mismatch between pollination supply and demand and developed risk assessment map will guide our future efforts on pollinator habitat conservation and monitoring to conserve crop pollination services.

• 한국환경과학회지
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• 제16권12호
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• pp.1451-1462
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• 2007

Heavy metal concentrations in the soil were investigated for the abandoned Samkwang metal mine, Cheongyang-Gun, Chungnam Province, Korea. The concentrations of heavy metal(As, Cd, Cu, Ni, Pb, Zn) were determined in mine soils collected at the abandoned mine sites to obtain a general classification and specification of the pollution in this highly polluted region. The results estimated with the normal test and basis statistic on the central tendency and variation showed that the distribution of heavy metal concentration had significantly different at the range of all locations. The range of spatial distribution on the relationship of heavy metal concentration and pH was $4.8{\sim}8.8$ and heavy metal concentration on the type of land use was highest in forest land, and also Ni and Zn in farm and rice field showed the high concentration. The distribution of heavy metal concentration on the depth of a soil showed that the metal concentrations in subsoil were higher than of those in surface soil, while the concentration of Cu and Ni had no significant difference on the depth of soil. Results from the correlation analysis using the data except the extreme and unusual data revel that Zn-Cd(r=0.867), Zn-As(r=0.797), Zn-Pb(r=0.764), Cu-Cd(r=0.673), Cu-As(r=0.614) and Zn-Ni(r=0.605) were the most important parameters in assessing variations of heavy metal in soil. To discriminate pattern differences and similarities among samples, principal factor analysis(PFA) and cluster analysis(CF) were performed using a correlation matrix. This study suggests that PFA and CF techniques are useful tools for identification of important heavy metal and parameters. This study presents the necessity and usefulness of multivariate statistical assessment of complex databases in order to get better information about the quality of soil and gives the basis information to clean up the abandoned mine sites.

• 한국수자원학회논문집
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• 제44권8호
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• pp.653-666
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• 2011

본 연구에서는 기후변화에 따른 홍수 취약성 평가기법을 제안하고 국내 5대강 유역에 적용 및 평가하고자 하였다. 특히 Multi-Model Ensemble 시나리오를 이용하여 평가 시 발생하는 불확실성을 제시하고자 하였다. 취약성 평가를 위해 우선 유역의 기상, 수문 자료를 비롯한 지형, 인문 사회 정보를 수집, 지표를 산정하여 현재 기후상태 하에서의 홍수 취약성을 평가하였다. 또한 기후변화에 따른 미래 홍수 취약성을 평가하기 위해 기존에 3개 온실가스 배출시나리오, 13개 GCMs (Global Climate Models), 3개 수문모형(2~3개 증발산량 산정방법)으로 생산된 39개 미래 기후시나리오 및 312개 미래 수문시나리오를 이용하여 기준 S0 (1971~2000년) 기간 대비 미래 S1 (2010~2039년), S2 (2040~2069년), S3 (2070~2099년)기간의 홍수 취약성의 시공간적 변화 및 불확실성을 평가하였다. 평가 결과 현재 기후상황에서 홍수에 취약한 지역은 한강, 섬진강, 영산강 하류 지역으로 나타났으며, 미래 기후변화 시나리오를 고려한 결과 낙동강, 금강, 한강 권역에서의 민감도가 가장 크게 변할 것으로 분석되었으나, 기본적으로 섬진강 유역의 적응능력이 낮기 때문에 미래에도 섬진강 유역이 홍수에 가장 취약할 것으로 분석되었다.