• 환경위생공학
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• 제16권4호
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• pp.77-89
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• 2001

The research is intended to evaluate the soil pollution quality of Chungbuk province with Soil Network which is executed every year. The survey executed with Soil Network in 1999 represented that the soil quality of Chungbuk province was relatively good as the average concentrations of contaminants in soil were Cd: 0.146 mg/17g, Cu: 3.143 mgHg, As: 0.636 mg/kg, Hg: 0.012 mg/kg, Pb): 4.505 mg/kg, $Cr^{+6}$ not detected, and the average pH was 6.1. The reckoned soil Pollution score (SPS) of Chungbuk province has been shown much low SPS distribution in the range from 1.6 to 141.7, average 31.0. However, it has been represented relatively high SPS distribution at Chungju, Tanyang, and Chinchon, respectively, It also huts represented high SPS distribution not only at agricultural area and waste area for the Pollution sources but at a paddy field and dry field for land use. The classification of soil pollution class(SPC) based on soil pollution score(SPS) was SPC 1 under 100 of SPS at 212 areas which were 98.6% of total 215 areas and SPC 2 over 100 of SPS at only three area left. There was no area exceeding soil pollution value among the whole Soil Network areas investigated, and the whole average for each items was much lower level th퍼n soil Pollution value was. When the average concentration of heavy metals and the average pH in soil of Chungbuk province are compared with the natural contents of that in Korea, the research is concluded that the average concentration of heavy met is relatively similar to the natural contents of that and the average pH in soil of Chungbuk province is a little higher than the natural contents of that. From this method, soil quality of most of the Soil Network area was estimated to be healthy.

• 한국건설관리학회논문집
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• 제7권3호
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• pp.149-158
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• 2006

현행 공동주택 신축공사 발주 시 건설기술관리법에 의해 발주자는 공사예정가격에 환경관리비를 별도로 계상해야 한다. 그러나 환경관리비 산출항목과 세부산출기준이 명확하지 못하다. 또한 환경관리비는 공사현장의 특성이 고려되어 계상되어야 함에도 불구하고 품셈에 의해 산출 가능한 항목만을 계상하거나, 요율로써 획일적으로 적용하고 있는 실정이다. 따라서 본 연구에서는 건설기술관리법의 환경관리비 정의를 바탕으로 산출기준을 재정립하여 환경관리비 항목도출과 산출방법을 개발하였다. 본 환경관리비는 공동주택 신축공사를 대상으로 하였으며, 산출방법과 데이터의 신뢰성 및 객관성을 확보하기 위하여 공공기관인 OOOO공사의 실적데이터를 기반으로 자료의 수집 및 분석을 실시하였다. 그리고 공사현장의 특성을 고려하여 공동주택 신축공사 환경관리비를 쉽고 간편한 매트릭스에 의해 산출할 수 있도록 하였다. 또한 사례를 통하여 본 연구에서 개발한 환경관리비 산출 매트릭스의 타당성을 검증하였다.

• 한국환경과학회지
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• 제10권5호
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• pp.365-371
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• 2001

The optimum dosage of quicklime in producing organic fertilizer using livestock wastes vith a greater than 80% water content was analysed. After one day had elapsed to allow for the organic fentilizer to dry, the quicklime dosage and the composition of the organic fertilizer were analysed. Any from done to the organic fertilizer was also assessed. The amount of the quicklime required to stabilize livestock wastes was determined by water content of livestock wastes. For J farm(slurry style) of which livestock wastes have 94.6% of water concentration, less than 3% of total amount of livestock wastes, for H farm (scraper style) of which livestock wastes have 85% of water concentration, less then 4% of total livestock wastes and Y farm(traditional style) of which livestock wastes have 80% of water concentration, less then 5% of total livestock wastes. Generally, in order to pack the organic fertilizer, water containing quicklime0stabilized livestock wastes should be less than 35%. It takes 9 days to keep this water content for the wastes from H and Y farms(less than 85% in water content), and 12 days for the wastes from J (94.6% in water content). According to the classification standard for compost constitution by Higgins, the crude fertilizers from all 3 farms had high grade $K_2O$ and CaO, the middle grade T-N and middle or low grade $P_2O_5$. Stabilization by quicklime is known to inhibit bacterial decomposition of organic matter and the activity of pathogenic organisms. In this study, more then 99.99% of coliform group, fecal group and viable cell count were reduced. Our results indicate that livestock wastes of greater 80% water content could be used to produce organic fertilizer without the addition of a material for moisture control.

• 보존과학회지
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• 제35권4호
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• pp.331-343
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• 2019

The purpose of this study was to investigate the material characteristics of black wares excavated from Yongyeon-ri, Damyang and to clarify the correlation of the factors that develop black coulor compared with black wares excavated from other regions. As a results of absorption rate, colour coordinate, compositional mineral, section analysis and contents showed high correlation between the kilns and the waste dumplings, indicating that they were made using the same materials. Second, comparing the microtextures and contents of the glaze layer with the excavated sherds from other kilns, a characteristic coagulation phenomena of iron oxides were not observed in Yongyeon-ri and Gilmyeong-ri, and it was considered that the material, mixing ratio, and firing environment were different from those of Bonggok-dong. In addition, statistical analysis using the major components revealed that the bodies of Yongyeon-ri were highly correlated with those of Bonggok-dong, which is nearest to the region, and similar to Gilmyeong-ri in the glaze layer. The characteristics of colorant were different depending on Fe₂O₃ content and K₂O content also contributed to the classification of the composition of each excavated kiln. Conclusionally, it can be seen from the scientific analysis that the colour of black wares excluded from different regions is materially different from that of iron oxide, the coloring condition, and the firing environment.

• 한국대기환경학회지
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• 제28권6호
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• pp.656-665
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• 2012

Recently, yearly production of SRF (Solid Recovered Fuel) as an alternative fuel has been rapidly increasing because of the limited waste disposal, rise in oil prices and reduction of greenhouse gas emission. However, SRF using facilities are excluded from the National Air Pollutant Emission Estimation because SRF using facilities are not yet included among the SCC (Source Classification Code). The purpose of this research was to estimate the emission and emission factor of SRF using facilities' PM and $NO_x$, in order to investigate whether or not they are included in the National Air Pollutant Emission Estimation. The emission factors of SRF using facilities' PM and $NO_x$ are calculated as 0.216 kg/ton, and 3.970 kg/ton, and the emission was estimated based on the yearly total SRF usage of 2011. The results above was 18.7% for PM and 12.8% for $NO_x$ emissions from combustion facility (SCC2) in manufacturing industry combustion (SCC1) of CAPSS. If CAPSS estimate the emission by adding SCC on unlisted SRF in case of Boiler (SCC3) fuel, both PM and $NO_x$'s emissions would increase by 15.8% and 11.3% compare to the emissions for the existing combustion facility. As a result, emissions caused by SRF should be considered when calculating the National Air Pollutant Emission Estimation. In addition, further researches to develop emission factor and improve subdivided SCC should be done in the future, for the accurate and reliable estimation of National Emission.

• 자원리싸이클링
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• 제11권1호
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• pp.9-18
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• 2002

폐 컴퓨터 기판(Printed Wiring Boards, PWBs)은 다양한 종류의 금속 및 합금류, 각종의 유기 및 무기화합물 등으로 구성되어 있다. 따라서 폐 기판에 포함된 유가물을 경제적인 방법으로 분리 회수하면 2차 자원으로써 활용가치가 매우 클 것으로 판단되어, 물리적인 선별기술에 의하여 유가금속을 분리 회수하는 데에 따른 특성 연구를 행하였다. 본 연구에는 폐 컴퓨터 기판에 탑재된 소켓류와 칩류를 탈리한 다음 소켓류, 칩류 및 보드류로 분리하여 각각의 산출물의 특성에 따른 적절한 물리적 분리선별 기술을 적용하였다. 소켓류를 파쇄하여 입자크기를 -2.36 mm/+1.18 mm 범위로 조절한 다음 건식 자력선별을 실시하였을 때, 자성산물의 약 97 wt%가 금속류였다. 칩류의 경우에는 -2.36 mm1+0.15 nun의 크기로 분쇄하고 공기분급 및 건 식 자력선별을 행하여 Fe-Ni 97%, Cu 95%를 각각 회수할 수 있었다. 보드류의 경우에는 금속류가 얇게 프린트 된 상태이기 때문에 가능한 단체분리 효과를 향상시키기 위하여 ball mill로 분쇄하였으며, 공기 분급기에 의한 정밀 분급을 행하여 Cu 77%를 회수할 수 있었다.

• 대한원격탐사학회지
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• 제36권1호
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• pp.1-13
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• 2020

Seasonal changes in river water vary seasonally as well as locationally, and the assessment is essential. In this study, we used the recent technique of post-classification by using the Google earth engine (GEE) to map the seasonal changes in Mahanadi river of Odisha. However,some fixed problems results during the rainy season that affects the livelihood system of Cuttack such as flooding, drowning of children and waste material deposit. Therefore, this study conducted 1) to map and analyse the water density changes and 2) to analyse the seasonal variation of river water to resolve and prevent problem shortcomings. Our results showed that nine types of variation can be found in the Mahanadi River each year. The increase and decrease of intensity of surface water analysed, and it varies in between -130 to 70 ㎥/nf. The highest frequency change is 2900 Hz near Cuttack city. The pi diagram provides the percentage of seasonal variation that can be observed as permanent water (30%), new seasonal (28%), ephemeral (12%), permanent to seasonal (7%) and seasonal (10%). The analysis is helpful and effective to assess the seasonal variation that can provide a platform for the development of Cuttack city that lies in Mahanadi delta.

• 한국유체기계학회 논문집
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• 제19권4호
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• pp.48-53
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• 2016

The centrifugal separator which uses gravity separation method for oil-water separation, rotating at high-speed, is one of the most commonly used device for controlling the amount of the oil in waste water collected in bilge. The IMO (International Maritime Organization) has set regulations, also known as MARPOL 73/78, for the prevention of marine pollution. In addition, DET NORSKE VERITAS (DNV) has set standards regarding the assignment of Environmental Class Notation, CLEAN or CLEAN DESIGN, of ships. One of the requirements for classification is that in addition to conforming to MARPOL 73/78, more stringent measures must be taken as well. One of these measures is to limit the oil concentration in bilge water to less than 5ppm. So in this study, an Oil-Water Separator (OWS) is used together with multiple separating plates as a filtration system to be used as an oil-water separation device. The OWS operates using centrifugal separation in which the mixture is separated by centrifugal forces. The main purpose of this paper is to present the OWS separation efficiency according to the rotation speed, mass-flow rate, the angle and the number of stacked layers of the laminated plate using Computational Fluid Dynamics (CFD). Improvements to the device will be investigated from these results.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2008년도 춘계 종합학술대회 논문집
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• pp.813-818
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• 2008

DWPI(Derwent World Patent Index) 데이터베이스를 이용하여 2002년부터 2006년까지 고피인용 특허 동향을 IPC(International patent Classification) 및 산업분류에 의해 분석하였다. 2002년부터 2006년까지 전세계 특허 중에서 상위 1%를 차지하는 고피인용 특허의 출원인 국적별 분포에서 미국 출원인이 전체 8,416건의 특허 중에서 5,634건(66.9%)으로 나타났으며, 일본(885건, 10.5%), 독일 (521건, 6.2%), 타이완(222건, 2.6%) 등으로 나타났다. 한국 출원인의 경우 151건(1.8%)의 고피인용 특허를 보유하고 있어 6위로 분석되었다. 특허청에서 분류한 산업 분류에 의해 고피인용 특허 분포를 분석한 결과 전세계 업종별 특허에서 제조업 분야의 특허가 7,962건(점유율 81.7%)으로 가장 많았고 폐기물처리업의 경우 578건(점유율 5.9%)으로 나타났다. 본 연구를 통해 분석한 기술 분야별 고피인용 특허는 세계적으로 가장 영향력 있는 특허 동향을 파악할 수 있을 것으로 판단된다.

• 한국토양비료학회지
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• 제42권1호
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• pp.14-20
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• 2009

토지이용에서 보았을 때 제주도는 해안을 따라 넓게 분포하는 밭과 과수원의 화학비료와, 중산간 지대 방목지의 가축분뇨 및 산발적으로 존재하는 주거지역의 생활하수에 의한 질산태 질소 오염이 추정되었다. 질소동위원소 분석이 이들 오염원들을 구분하기 위하여 사용되었으며, 주요 오염원인 요소, 유안, 축분정화조, 축분유기질 비료에 대해 측정된 $\delta^{15}N$ 값을 토대로 화학비료에 의한 오염은 5‰ 이하, 생활하수 혹은 가축분뇨에 의한 오염은 10‰ 이상으로 기준을 정하였다. 제주도 전역에 걸친 33개 관정의 질산태 질소 동위원소 분석결과는 대부분의 관정이 화학비료에 의해 오염되었으며, 일부 관정이 가축분뇨와 생활하수에 의해 영향받았음을 나타내었다. 이러한 결과는 질소동위원소분석이 토지이용분류로는 판별하기 어려운 오염원 추정에 매우 유용한 수단이 될 수 있음을 나타낸다. 특히 좁은 지역에서 토지이용이 다양하게 이루어 지고 있는 경우에 중요한 오염원 추정 수단이 될 수 있음을 경기, 강원 지역의 지하수 분석을 통해 확인할 수 있었으며, 또한 두 가지 이상의 오염원이 동시에 작용할 수 있고 그 기여도가 시기별로 달라질 수 있음을 확인하였다.