• 한국지반신소재학회논문집
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• 제6권3호
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• pp.39-46
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• 2007

세계적으로 폐기물의 발생량이 급증하여 매립지의 숫자가 급증하고 있으나 사용이 완료된 매립지의 처리에 많은 어려움이 있다. 특히, 도시 폐기물 매립지는 인구밀집 지역과의 근접성, 부지개발에 따른 경제적 가치의 급등 등의 이유로 활용 가능한 새로운 건설부지로서 많은 관심이 집중되고 있다. 그러나, 폐기물 매립지반 위에 구조물을 축조할 경우, 특별한 안정처리 및 보강처리를 하지 않은 경우, 지반침하, 구조물에 대한 지지력 확보 등에 문제점이 발생될 수 있다. 따라서, 본 연구에서는 폐기물 매립지반위에 구조물을 축조할 경우, 지오그리드 및 지오셀의 보강 효과를 규명하고자 반복평판재하시험을 수행하여 주요 영향인자인 지지력증가비, 지반계수, 스프링상수, 탄성회복율 등을 평가하였다.

• 한국지반환경공학회 논문집
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• 제9권2호
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• pp.67-74
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• 2008

세계적으로 폐기물의 발생량이 급증하여 매립지의 숫자가 급증하고 있으나 사용이 완료된 매립지의 처리에 많은 어려움이 있다. 특히, 도시 폐기물 매립지는 인구밀집 지역과의 근접성, 부지개발에 따른 경제적 가치의 급등 등의 이유로 활용 가능한 새로운 건설부지로서 많은 관심이 집중되고 있다. 그러나, 폐기물 매립지반 위에 구조물을 축조할 경우, 특별한 안정처리 및 보강처리를 하지 않게 되면 지반침하, 구조물에 대한 지지력 확보 등에 문제점이 발생될 수 있다. 따라서, 본 연구에서는 수치해석시 무보강, 토목섬유 보강후 상부에 화강풍화토로 복토하여 토목섬유 보강지반의 지지력 특성을 평가하였다. 즉, 탄성모델을 기초로 2차원 해석시 하중재하에 따른 지표면의 무보강 및 보강의 경우, 각각의 수직변위 및 수평변위를 분석하여 토목섬유의 보강효과를 규명하였다.

• 자원환경지질
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• 제22권3호
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• pp.277-283
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• 1989

For the study of attenuation phenomena of the radioactive elements in solution, the adsorption experiment of thorium, uranium, barium and strontium on kaolinite, gibbsite, quartz, granite and shale as a function of time, pH and the surface area was conducted under the competition condition each other. There are two steps of adsorption kinetics. The first step is faster and completes in hours or a day, and the second step is slower eqiulibrium reaction. The adsorption rate which is considered to be related to CEC differs with adsorbent and decreases in the order of shale, kaolinite, granite, gibbsite and quartz. On the other hand, the adsorption rate for the same adsorbent differs with elements in the order of thorium,uranium, barium and strontium in decreasing rate. It is also affected by pH of the solution and the surface area of adsorbent. In conclusion, we didn't find any different between noncompetition condition and competition condition, and this means that we only have to consider the pH of ground water, the characteristics of the geological materials and the kinds of radioactive element in the case of selection of the places for the radioactive waste disposal.

• 한국농공학회지
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• 제42권5호
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• pp.114-124
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• 2000

The method to estimate agricultural organic matter flow on the regional scale was established and applied to a rural area in Chongwon-gun, Chungbok in 1996. The study area is of about 67$\textrm{km}^2$ and its population is about 7,000. The stocks and flows of organic matter are represented in dry weight per unit area and dry weight per unit area per year, respectively. the amount of inflow of organic matter indicates a possibility to cause environmental pollution. the amount of animal waste 767 kg/ha/yr account for 42 percent of total amount of organic waste 1,834 kg/ha/yr and therefore the environment in study area is greatly influenced by livestock. The decrease in recycling rate of animal waste form 100% to 70% has greatly increased the amount of disposal waste nearly twice, i.e., from 267 kg/ha/yr to 497kg/ha/yr . The results of this study demonstrate that appropriate animal population, increase in recycling of animal waste and preservation of agricultural land are necessary for environmental conservation of the study area.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.1191-1193
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• 2003

Water quantity and quality monitoring at Taipei Watershed Management Bureau (WRATB) is not only a daily business but also a long term job. WRATB is responsible for providing high quality drinking water to about four millions population in Taipei. The quality of drinking water provided by WRATB is among one of the best in Taiwan. The total area is 717 square kilometers. The water resource pollution is usually divided into two categories, point source pollution and nonpoint source pollution. Garbage disposal is the most important component of the point source pollution, especially those by tourist during holidays and weekends. Pesticide pollution, fertilizer pollution, and natural pollution are the major contributions for nonpoint source pollution. The objective of this paper is to implement remote sensing, geographic information systems, and global positioning systems to monitor water quantity and water quality at WRATB. There are 12 water quality monitoring stations and four water gauge stations at WRATB. The coordinates of the 16 stations were determined by GPS devices and created into the base maps. MapObjects and visual BASIC were implemented to create application modules for water quality and quantity monitoring. Water quality of the two major watersheds at WRATB was put on Internet for public review monthly. The GIS software, ArcIMS, can put location maps and attributes of all 16 stations on Internet for general public review and technical implementations at WRATB. Inquiry and statistic charts automatic manipulations for the past 18 years are also available. Garbage disposal by community and tourist were also managed by GIS and GPS. The storage, collection, and transportation of garbage were reviewed by ArcMap file format. All garbage cart and garbage can at WRATB can be displayed on the base maps. Garbage disposal by tourist during holidays and weekends can be managed by a PDA with a GPS device and a digital camera. Man power allocation for tourist garbage disposal management can be done in an integration of GIS and GPS. Monitoring of water quality and quantity at WRATB can be done on Internet and by a PDA.

• 한국항만학회지
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• 제9권1호
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• pp.45-56
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• 1995

Investigation of the physical behavior of dredged material disposal in coastal water includes estimations of water column concentration in the receiving water, exposure time, the initial deposition pattern as well as thickness of material at the dumping fields near the estuary area. Calculation based on vertical setting and horizontal advection of single particles ignore the effects of bulk properties of the disposed material, vertical and horizontal diffusion, and material dilution due to the entrainment of ambient water during descent. This paper focuses on the spatial and temporal changes in the dumping fields for the water column and bottom at a hypothetically confined coastal water, where the ambient time-invariant velocity and density profiles are applied, within the initial time period following the instantaneous release of the dredged material. This model accounts the behavior of material after release divided into three phases: convective descent, dynamic collapse and long-term passive dispersion

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.2910-2916
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• 2011

Environmental conservation is becoming the major conversation topic in the 21st century, the era of environment. In the Law for the Preservation of Water Quality, article 53 states "A business unit which is doing business causing pollution caused by non-point pollutant or builds waste water discharge facilities, should report the installation of the non-point pollutant and install the required pollution control facilities". Environmental pollution caused by oil leaks during operation or maintenance has been found in the railway sector. Especially, rolling stock depot is most likely to be affected by environmental pollution. Therefore, in this paper We have investigated non-point pollutant in the rolling stock depot area and have studied adequate disposal method to minimize the effect of the non-point pollutant, hoping to supply the preliminary data for building an environment-friendly rolling stock depot.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2002년도 추계학술발표회
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• pp.355-358
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• 2002

A sediments are Integral called as gravel, sand, clay, mineral materials which are settling in bottom layer of reservoir, stream, and oceans from land. In practical problems relations of sediments are flood by decreed of flow capacity and down of water quality. Dredged sediments are composed with constructed material and variety of pollutant compounds. Therefore, it is very much of cost effects in nationally, if development for use of constructed material separated only constructed material within sediments. And it will be continue to the dredge operation of stream sediment for retrofit of water environment and sustainable's after the years. The following results could be obtained : In case of high concentration sediments, sample for design of CDF was shown property of flocculent settling. Assuming that average inflow rate is 1, 000㎥/hr, mean residence time( $T_{d}$), average ponding depth( $H_{pd}$ ), and design surface area for flocculent settling( $A_{df}$ ) were 5 hr, 0.6m, and 15, 750 $m^2$ respectivelyrespectivelyy

• 대한원격탐사학회지
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• 제6권2호
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• pp.135-151
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• 1990

Solid and hazardous waste disposal site selection by using GIS(Geographic Information System) is the purpose of this study. The criteria of site selection are usually defined in accordance with geological, cultural and social characteristics. Unadequate adaptation of these criteria in a site selection may cause serious problem of water and soil pollution. The environmental information for extraction of these criteria consist of a lot of data : geology, geomorphology, hydrogeology, engineering geology, cultural and social information.... GIS could be easily applied to construct of this environmental information data base, and carry out cartography simulation using overlay mapping technique(polygon overlay). ARC/INFO(GIS system) was used for these studies, and AML(ARC/INFO Macro Language) in this system provided more variable and effective methods for cartography simulation. TM(Thematic Mapper) images were used for the evaluation of land cover/use in the studied area, by using ERDAS image processing system.

• Bulletin of the Korean Chemical Society
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• 제18권8호
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• pp.814-818
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• 1997

The chemical waste treatment, APEG (alkali/polyethylene glycol) process has been shown to be effective for the dechlorination of PCBs in transformer oil. Considerable amount of PCBs, however, still remains in the waste exceeding the 25-50 ppm limit set by regulatory agency. A new thermal regeneration technology has been developed in our laboratory for disposal of hazardous organic wastes. Due to the limited oxidation of carbon surface through the reverse movement of flame front to oxidant flow, this technology was termed counterflow oxidative system (COS). Specially, the oxidant flow in the COS process is a principal parameter which determines the optimum conditions regarding acceptable removal and destruction efficiency of adsorbed organic wastes at minimal carbon loss. The COS process, under optimum conditions, was found to be very effective and the removal and destruction efficiency of 99.99% or better was obtained for residual PCBs in the waste while bulk (≥90%) of carbon was recovered. Any toxic formation of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzo furans (PCDFs) were not detected in the regenerated carbon and impinger traps. The results of surface area measurement showed that the adsorptive property of regenerated carbon is mostly reclaimed during the COS process.