• 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.

• 응용통계연구
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• 제25권5호
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• pp.733-741
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• 2012

The successful launch of Arirang satellites allow the acquisition of high resolution satellite imagery of Korean territory and enables the transition from the conventional cultivation area survey method to new image based methods adopted in advanced nations. In this study, we suggested reasonable sizes of the primary sampling unit and the secondary sampling unit for the satellite imagery based sampling design in 8 provinces preselected for this research. The PSU size was determined mainly in consideration of intracorrelation that shows the degree of homogeneity within each cluster and the efficiency of the image process. For the SSU size, we considered the relative standard error and the differences between the land cover maps produced by the Ministry of Environment and the satellite imagery processed by the National Statistical Office.

• 한국지리정보학회지
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• 제16권4호
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• pp.171-188
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• 2013

고해상도 항공사진과 지적도를 이용하여 4대강 사업 전 후에 발생한 하천구역 내 토지이용변화와 지적정보 오류 형태를 분석하여, 국공유지 지적정리사업 시 정책적 자료로서 활용하고자 하였다. 연구대상지는 토지이용변화가 가장 많이 일어난 낙동강 4개보를 중심으로 총 40km안쪽의 하천구역으로 선정하였다. 그 결과, 4대강 사업이 실시되었던 총 하천구역의 필지별(84.3%)과 면적별(85.5%) 국공유지 소유비율과 유사하게 필지별(79.9%)과 면적별(93.3%) 국공유지 비율이 높게 나왔으며, 지목을 기준으로 사업 전은 하천(71.6%)과 전(12.3%)이, 사업 후에는 하천은 42.7%로 크게 줄어든 대신, 체육용지를 포함한 공원지역(19.6%)과 잡종지(20.8%)가 크게 늘어났다. 또한, 사업 전 후의 필지수를 비교해 본 결과, 행정구역과 소유구분을 고려하지 않았지만, 86.7%의 감축효과를 보이는 것으로 밝혀졌다. 지적정보의 오류 유형으로는, 지적정보 누락, 지적선 중첩, 지적선 위치와 경계 오류, 미세폴리곤 발생, 지적선과 하천경계선의 불일치를 찾아 볼 수 있었다. 항공사진분석을 통한 토지이용변화 모니터링 방법은 하천구역과 같은 국공유지의 효율적인 관리방안으로 신속한 정보획득을 통한 토지이용현황파악 및 재산관리지원에 효과적으로 활용 가능할 것이다.

• Korean Journal of Geomatics
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• 제3권1호
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• pp.59-65
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• 2003

The merging of different scales or multi-sensor image data is becoming a widely used procedure of the complementary nature of various data sets. Ideally, the merging method should not distort the characteristics of the high-spatial and high-spectral resolution data used. To present an effective merging method for survey of reclaimed land using the high-resolution (6.6 m) Electro-Optical Camera (EOC) panchromatic image of the first Korea Multi-Purpose Satellite 1 (KOMPSA T-l) and the multispectral Moderate Resolution Imaging Spectroradiometer (MODIS) image data, this paper compares the results of Intensity Hue Saturation (IHS) and Principal Component Analysis (PCA) methods. The comparison is made by statistical and visual evaluation of three-color combination images of IHS and PCA results based on spatial and spectral characteristics. The use of MODIS bands 1, 2, and 3 with a contrast stretched EOC panchromatic image as a substitute for intensity was found to be particularly effective in this study.

• The Journal of Asian Finance, Economics and Business
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• 제9권6호
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• pp.1-9
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• 2022

The study aims to determine the factors and their influence on the income from using public agricultural land of households. Public agricultural land is agricultural land, including land for growing annual crops, perennial crops, and land for aquaculture, leased by commune-level People's Committees with a lease term of not more than 5 years. Secondary data were collected for the 2017-2021 period at state agencies. Primary data were collected from a survey of 150 households renting public agricultural land. The regression model assumed that there were 28 factors belonging to 7 groups. The test results show that 25 factors affect income, and 03 factors do not. The group of COVID-19 pandemic factors has the strongest impact, followed by the groups of agricultural product market factors, land factors, capital factors, production cost factors, labor factors, and climatic factors. The impact rate of COVID-19 pandemic factors is the largest (23.00%); The impact rate of climatic factors is the smallest (6.04%). Proposals to increase income include good implementation of disease prevention and control; increasing the land lease term; accurately forecasting the supply and demand of the agricultural market; raising the level of the household head; ensuring sufficient production capital, and adapting to the climate.

• 한국주거학회논문집
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• 제17권1호
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• pp.77-84
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• 2006

Government uses some sections of intended areas of abolition in Development Restricted Zones(DRZ) to construct a million national rental houses. It has been opposed by environmental NGOs, local governments and land owners. Therefore, government carried out a questionnaire survey to make plans for the better development of housing estates for national rental houses in DRZ. The results of the survey are as follows: First, using abolished DRZ has to be kept to a minimum, though the continued construction of this kind of houses is inevitable. Second, it has to be designed using pro-environmental techniques. Third, the discussion between the interested groups was not enough. Fourth, residents were dissatisfied with the compensation package. The policies based on this research, are as follows: First, meetings for projects presentation and public hearings have to be held on a regular basis. In addition, the consultative council with residents, local NGOs, and local governments should be combined. Second, The plan should promote social integration through the mixing of rental and owner-occupied houses. Third, a compensation policy, which offers land or houses, and not only cash, needs to be introduced.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.411-414
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• 2005

In this study, 8 Landsat(TM/ETM+) satellite images acquired from 1984 to 2002 were used to investigate the growth of Chuncheon city, Kangwon-do, Korea. The images were geocoded and classified using training set collected from field survey. Four land-use types were classified such as urban area, green zone, agricultural land and water body. It also showed rapid increase of urban area in the past two decades from 1166ha in 1984 to 3358ha in 2002. About 2182ha of agricultural land and green zone have been changed to urban area. Agricultural land was newly formed from the green zone.

• 한국농공학회논문집
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• 제65권6호
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• pp.79-91
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• 2023

This study surveyed the actual status of reclamation areas in South Pyongan Province, North Korea, using satellite images and literature to survey the creation date, area, and length of the embankment of the reclamation areas. The reclamation areas in South Pyongan Province were created in three stages, with the first stage completed in the late 1970s or early 1980s, the second stage in the late 1980s or early 1990s, and the third stage in the 2000s. The total area of the reclamation areas is 105,570 hectares. The land cover of the reclamation areas is as follows: agriculture (50.5%), saltern (29.5%), water bodies (13.6%), foreshore (12.4%), grasslands (3.0%), bare land (0.4%), facility (0.1%), and forests (0.1%). The study also found that the NDVI values of the reclamation areas vary depending on the location. The NDVI values of the Gwiseong and Namyang reclamation areas are low, while the NDVI values of the Samcheonpo and Jigdongbaedali reclamation areas are high. The study found that the NDVI values of the reclamation areas are correlated with the land cover of the reclamation areas. The study's findings can be used to understand the development direction and regional characteristics of the reclamation areas in South Pyongan Province. The study's findings can also be used to develop policies and plans for the sustainable development and utilization of the reclamation areas in South Pyongan Province.

• 현장농수산연구지
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• 제9권1호
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• pp.3-12
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• 2007

It is our imminent project that we should train young and able manpower to strengthen the international competitiveness under the free trade of agricultural products, to solve the problem of decrease in farm population and of aging people in agriculture. The objective of this research is to suggest an alternative policy plan through the survey and analysis on the controversial issues in loans for starting agricultural business based on the survey of graduates of Korea National Agricultural College from 2002 to 2005. According to the survey, in case of graduates who are not available sufficient fanning capital such as land and agricultural facilities on it, they are not able to get loans from banks in that situation. The survey, as a result, points out that those who are legally required to do farming should be given several special aids by the government such as the improvement of Credit Guarantee Fund System for Farmers and Fishermen and the farming loans conditions for initial farm business, a long term lease of public land, giving a priority in lease-farmland project of farmland bank and allowing loan for working capital for farm management.

• 한국초등과학교육학회지:초등과학교육
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• 제34권4호
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• pp.486-501
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• 2015

In the elementary school science curriculum, wind is one of the most important concept. In particular, land and sea breeze has been a key example to deliver how wind is driven, and thus its model experiments have been used to help students understand causes of wind. Here we compare causes and explanations for wind and land and sea breeze between textbooks in colleges and elementary schools to examine any potential improvement for the contents. In addition, we conducted survey to examine how pre-service teachers understand land and sea breeze, and convection box experiment used in elementary school textbooks is useful to understand land and sea breeze. Based on the comparison, we find that college level textbook explains the cause of wind as atmospheric pressure difference while elementary school textbooks explain them differently according to curriculums. In the textbooks, there are a difference in the way described for land and sea breeze. Analysis of questionnaire indicate that pre-service teachers understood land and sea breeze correctly, and they selected the convection box experiment in 2009 curriculum textbooks as the most suitable one. Explanations and experiments for land and sea breeze in the textbooks have been revised as the modification of elementary school curriculums. We expect this study helps to deliver more solid contents for wind and land and sea breeze in the upcoming new curriculum.