• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.712-713
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• 2015

In recent years, the bid-rigging in public construction markets has been treated as a critical issue in Fair Trade Commission. The investigation revealed that the collusion was implemented extensively in every area from the material supply to the construction service of general contractors. This study reviewed the causes of the bid-rigging in public construction projects, and proposed the improvement plan to eradicate bad practices. Firstly, the causes and purposes of bid-rigging were categorized into two types of internal factors from construction companies and external environment factors influencing business activities. Secondly, the system development method was explained to detect the signs of bid-rigging based on the technical proposal documents in open tender. The detection systems of repetitive public owner also provide the function of sharing data on the companies and cases to violate the fair trade regulation. In addition, the problems and improvement direction of public procurement policies were discussed.

• 한국수학사학회지
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• 제37권3호
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• pp.59-75
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• 2024

This study aims to analyze Joseon mathematical knowledge and its application to real world. The mathematical knowledge refers to measuring the area of plane figures, known as square-shaped land(方田). Its application is land surveys(量田) conducted for taxation purposes. Specifically, this study analyzes the correlation between the related contents in representative mathematical books of the Joseon Dynasty, such as MuksaJipsanbub (17th century), Guiljib (18th century), and SanhakIbmun (18th century), and the shapes and areas of plane figures presented in GwangmuYangan (20th century). The analysis reveals both differences and similarities in the measured area between mathematical books and real world land surveys. While most results of the land survey align with the results obtained from mathematical methods, differences arise due to variations in real measurement of lengths and given conditions in the problems. Additionally, various aspects such as the focus on rectangles in land surveys, the proportionality and relativity of lengths, types of approximation, composed shapes, the purpose of problem solving, and reasoning of unspecified shapes or measures are discussed.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2001년도 총회 및 춘계학술발표회
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• pp.222-225
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• 2001

In urban environments, the surface land impermeability fundamentally related to urban growth emphasizes the environmental problems such as the storm water peak flow (so-called the urban flooding) and the pollution. The conventional urban drainage system provides a number of temporary reservoirs intercepting and retaining surface-derived pollutants following their introduction to and deposition upon the impermeable surface. Gully-pots are common features in urban drainage systems in Korea, which were installed for draining rainwater to prevent regurgitation in rainy season and retaining larger particles, hence minimizing pipe blockage problems. When the road runoff conveying sediment enters a gully-pot, the sediment mixes with the gully liquor causing direct pollution of receiving waters. The characteristics of local sediment contamination are usually related to the types of land use activities that take place or have taken place within the area., This study was undertaken to evaluate the spatial and temporal variations of the contamination of gully-pot sediments in Seoul with respect to heavy metals such as As, Cd, Co, Cr, Ni, Pb, Cu and Zn. The heavy metal data were examined according to the land use type. In this paper, sampling sites in Seoul were divided into six groups (commercial area, industrial area, residental area, motor way, rural area, and local pollution).

• Environmental Engineering Research
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• 제19권3호
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• pp.185-195
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• 2014

Despite the enormous technical and economic efforts to improve environmental conditions, currently about 40% of the global population (or 2 billion people) are still lack access to safe water supply and adequate sanitation facilities. Pollution problems and transmission of water- related diseases will continue to proliferate. The rapid population growth and industrialization will lead to a reduction of arable land, thus exacerbating the food shortage problems and threatening environmental sustainability. Natural systems in this context are a transdisciplinary approach which employs the activities of microbes, soil and/or plants in waste stabilisation and resource recovery without the aid of mechanical or energy-intensive equipments. Examples of these natural systems are: waste stabilisation ponds, aquatic weed ponds, constructed wetlands and land treatment processes. Although they require relatively large land areas, the natural systems could achieve a high degree of waste stabilisation and at the same time, yield potentials for waste recycling through the production of algal protein, fish, crops, and plant biomass. Because of the complex interactions occurring in the natural systems, the existing design procedures are based mainly on empirical or field experience approaches. An integrated kinetic model encompassing the activities of both suspended and biofilm bacteria and some important engineering parameters has been developed which could predict the organic matter degradation in the natural systems satisfactorily.

• 농촌계획
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• 제4권2호
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• pp.1-7
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• 1998

This research is concerned with a comparative cognition of environmental issues in the countryside between socio-cultural groups. Environmental issues have been con연nod to litter, soil, sewage, wild life, noise, landscape, air, housing development, waste land and pesticides. Socio-cultural groups consisted of urban and countryside people who live in Korea and UK. The method of this study depended upon a standard questionnaire with a semantic scale. The cognition of Korean and British people are significantly different in every respect(p =.0001)except air issues. There is a significant similarity between Korean groups in 10 environmental issues(p > .03). Both Korean groups have generally recognized that their countryside environment has faced serious problems to be solved while British groups have not recognized serious problems in their countryside compared to the Korean groups. To both Korean and British groups the most worrying amongst the 10 environmental issues is the litter problem. In particular, there is a significant difference between British groups in soils(p = .0001), wildlife(p = .0009), air(p = .0001) and waste land(p = .0027). The existing policies (or countryside environment in Korea should be completely reconsidered and in Britain policies towards soils, wild life, air and waste land need to be reviewed. From the results it can be seen that cognition to countryside environment undergoes more cultural influences rather than social ones.

• Journal of Ecology and Environment
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• 제43권2호
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• pp.129-160
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• 2019

Background: Characterizing and describing soils and land use and make a suggestion for sustainable utilization of land resources in the Ethiopian Rift valley flat plain areas of Lake Chamo Sub-Basin (CSB) are essential. Objectives: To (1) characterize soils of experimental area according to World Reference Base Legend and assess the nature and extent of salinity problems; (2) characterize land use systems and their role in soil properties; and (3) identify best land use practices used for both environmental management and improve agricultural productivity. Methods: Twelve randomly collected soil samples were prepared from the above land uses into 120 composites and analyzed. Results: Organic carbon (OC) and total nitrogen (TN) were varied along different land uses and depleted from the surface soils. The soil units include Chernozems (41.67%), Kastanozems (25%), Solonchaks (16.67%), and Cambisols (16.67%). The identified land uses are annual crops (AA), perennial crops (PA), and natural forest (NF). Generally, organic carbon, total nitrogen, percentage base saturation (PBS), exchangeable (potassium, calcium, and magnesium), available phosphorus (P₂O₅), manganese, copper, and iron contents were decreased in cultivated soils. Soil salinity problem was observed in annuals. Annuals have less nutrient content compared to perennials in irrigated agriculture while it is greater in annuals under rainfed. Clay, total nitrogen, available phosphorus, and available potassium (K₂O) contents were correlated positively and highly significantly with organic carbon and electrical conductivity. Conclusion: Management practices that improve soil quality should be integrated with leguminous crops when the land is used for annual crops production.

• 한국측량학회지
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• 제14권1호
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• pp.97-110
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• 1996

도시공간구조의 분석이나 도시계획, 교통계획 등에 필요한 도시토지이용정보는 인공위성 자료(해상도에 따라 10 m정도까지 해석가능)나 지형도(축척은 1:50,000이서 1:5,000까지), 필지별 지목(지적도, 토지대장)이나 건축물용도 분류 자료(건축물대장)를 중심으로 획득하였다. 토지이용변화가 심하고, 고층화, 고밀화에 의한 용도혼합이 이루어져 있는 상태에서 이러한 도시토지이용정보는 상세계획, 재개발, 도시설계 등의 미시적인 수준의 도시계획 및 개발에는 부적당하다. 특히 미시적인 레벨의 도시토지이용 정보로서 건축물 용도분류자료는 상당히 의미 있는 자료이지만, 토지이용의 복합화 및 용도혼합, 건축물의 고층화와 대형화가 진행되고 있는 도시 내부지역에서는 보다 개별자료(필지-건축물-사용자)의 데이터베이스 구축에 의한 자세하고 정확한 파악이 필요하다. 본 연구에서는 개별 사업 체 자료(종업원수, 사용면적 등)를 이용한 도시토지이용정보체계에 의한 도시토지이용을 기존의 지목 및 건축물 용도분류에 의한 토지이용과 비교 평가하여 앞으로의 토지이용정보체계 구축에 따른 문제점과 해결방안 및 연구과제를 제시한다.

• 한국환경복원기술학회지
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• 제20권4호
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• pp.15-28
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• 2017

A protected area means a space designated and protected by law from development pressure and environmental pressure. It is mainly designated to protect specific ecosystems, natural landscapes, and cultural resources from irrational development (or damage), and involves policies of the public sector such as central and local governments. The United Nations Educational, Scientific and Cultural Organization (UNESCO) has conducted conservation and restoration projects for preserving natural ecosystems and genetic resources. In order to conserve the ecosystem in the protected area, national and public organizations purchase private land and use it ecologically; in addition, ecological restoration project is carried out for the purpose of creating waterside ecological belt or preserving ecosystem. Land acquisition refers to the land where highly influenced by the water quality and need to restore, and purchased by negotiating with the landlord. Although the nation and public institution carried out ecosystem restoration project for partial purchase land in order to conserve ecosystem, it is below the expected effect due to lack of comprehensive management system and have some problems in restoration project and unification of management institutions. Land acquisition in Donggang River Basin Ecological Conservation area is initiated in 2005 for creating income of local residents and ecological restoration. However, the lack of overall management and awareness resulted in poor vegetation growth and poor response by local residents due to terrain exposure. As such, there is insufficient research on the current situation and systematic integrated management although the number of land acquisition is increasing year after year. Futhermore, overall recognition and follow-up monitoring of eco-restoration are still inadequate. Therefore, the survey on the awareness of the purchase land ecosystem restoration project is necessary for the efficient restoration project and establishment of the management strategy for land acquisition in the future. Therefore, in this study, we provide fundamental materials on further research projects by carrying out research on the awareness of ecological restoration projects in the Donggang River basin ecological preservation area.

• 기술사
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• 제33권2호
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• pp.22-33
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• 2000

The 4th National Comprehensive Planning is a blueprint of national plan to be accomplished by the year 2020. This article indicates grounds of establishing the plan, characteristics and problems of the plan. Following is the principal contents which are treated in the article; 1st, strategy of constructing opened and combined land axis, 2nd, competency intensifying strategy by areas, 3rd, constructing health and pleasant national environment,4th, strategy for organizing express transportation and information network through the whole land, 5か, special features related building basis of cooperation interchange between North and South Korea. In the conclusion, although there were some problems through 3 times national comprehensive planning, this plan should be helpful to develop nation keeping balance for which construction and preservation would be harmonized appropriately.

• Journal of the Korean Institute of Landscape Architecture International Edition
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• 제1호
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• pp.28-32
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• 2001

The author has analyzed the ecological problems caused by city development and the comprehensive benefits of green space(e.g. ecological, social and economic benefits). The important role of green space in city sustainable development was discussed. Through benefits analysis of green space in city development in Kunming City, the author offered specific measures for green space protection in Kunming: strengthen plant management according to law; enhance nation awareness of plant protection; rationally plan city green land system;and use scientific forms of green land.