• 공업화학
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• 제24권6호
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• pp.616-620
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• 2013

본 연구에서는 자원 재활용-에너지에 바탕을 둔 돈분, 계분, 혼합물의 연소특성에 대하여 고찰하였다. 시험편은 건조 오븐을 이용하여 항량까지 건조시킨 후에, 콘칼로리미터(ISO 5660-1)를 이용하여 연소성질을 시험하였다. 그 결과 돈분의 최대유효연소열(78.72 MJ/kg)은 계분(69.41 MJ/kg)과 비교하여 탄화수소의 많은 양 때문에 비교적 증가했다. 또한 돈분의 $CO_2$ 발생속도(0.1959 g/s)와 총연기발생률($419m^2/m^2$)도 각각에 대하여 계분보다 증가하였다. 반면에 계분의 CO 발생량(0.0996 kg/kg)과 CO 발생속도(0.0034 g/s)는 계분이 함유하고 있는 많은 무기물 함량 때문에 각각 돈분보다 높았다. 따라서 높은 연소 에너지는 탄화수소 함량에 의존하여 발생되는 것으로 판단된다.

• 한국세라믹학회지
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• 제54권2호
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• pp.108-113
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• 2017

The use of aluminum-based coagulants in water pretreatment is being carefully considered because aluminum exposure is a risk factor for the onset of Alzheimer's disease. Lightly burned-dolomite kiln dust (LB-DKD) was evaluated as an alternative coagulant because it contains high levels of the healthful minerals calcium and magnesium. An organic pore forming agent (OPFA) was incorporated to prepare porous granules after OPFA removal through a thermal decomposition process. A spray drying method was used to produce uniform and reproducible spherical granules with low density, since fine dolomite particles have irregular agglomeration behavior in the hydration reaction. The use of fine dolomite powder and different porosity granules led to a visible color change in raw algae (RA) containing water, from dark green to transparent colorlessness. Also, dolomite powders and granules exhibited a mean removal efficiency of 48.3% in total nitrogen (T-N), a gradual increase in the removal efficiency of total phosphorus (T-P) as granule porosity increased. We demonstrate that porous dolomite granules can improve the settling time and water quality in summer seasons for the emergent treatment of excessive algal blooms in eutrophic water.

• 한국광물학회지
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• 제23권3호
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• pp.219-225
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• 2010

저등급 석탄인 갈탄(lignite)을 순환 유동층 가스화기(circulating fluidized bed gasifier)의 효과적인 가스화를 위한 공급탄으로 제조하기 위하여 모든 조건들은 동일하고 스크린의 크기만을 변경하여 목적하는 입도분포 특성을 달성하는 최적조건을 찾기 위한 실험을 수행하였다. 가스화기 공급탄은 0.045~1 mm 크기로 85 wt% 이상이 요구되며 이러한 입도분포를 갖는 공급탄을 제조하기 위해서는 경제적이면서도 효과적인 공정 설계가 반드시 필요하다. 따라서 본 연구는 중국산 갈탄을 해머밀로 효과적으로 분쇄하기 위하여 다구치 설계를 사용하였으며, 설계조건에 따른 실험결과 및 통계분석 결과 95% 유의수준에서 1차 스크린의 크기는 3 mm, 2차 스크린의 크기는 1.3 mm인 경우가 최적화된 조건인 것으로 나타났다.

• 한국생활과학회지
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• 제21권4호
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• pp.781-790
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• 2012

In midst of growing interest and awareness towards sustainability and being "green", there has been increased demand for sustainable clothing. In the purpose of boosting eco-friendly textiles industry, this research was conducted by investigating environmentally-conscious clothing behavior of university students and assessing their views on eco-friendliness of fibers. Thus, their awareness on recycled polyester fiber was evaluated. The research was conducted by surveying 257 university students residing in Daejeon. The data were analyzed with descriptive statistics, factor analysis, and reliability analysis, using SPSS 19.0. The results were as follows. 1) The majority of the subjects answered "Disposing clothing in the clothing recycling container" to reduce environmental impact. 2) Six factors of eco-friendliness of fiber were extracted as reutilization, unfinishedness, economics, environment preservation, natural materials, and slow fashion by using factor analysis. 3) Subjects scored organic cotton as most eco-friendly among various fibers. Recycled polyester fiber was graded less sustainable than natural fiber, but more eco-friendly than artificial one. 4) In assessment of subject's awareness of recycled polyester fiber, they highly valued on resource-reutilization and economics, but less valued on its hygiene, thermal insulation and health-functionality.

• 한국응용과학기술학회지
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• 제27권4호
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• pp.427-436
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• 2010

Much oyster shell is breeding by character and conduct of oyster-industry for a long time among them. An experimental study was carried out to investigate the recycling possibility of waste oyster shells, which induce environmental pollutions by piling up out at the open or the temporary reclamation. The purpose of this study is to develope eco-friendly binder using waste oyster shells, and to reinforce soils fur soft soil improvement. In this paper, a series of laboratory tests including compressive pot tests were performed to evaluate characteristics of soils treated by developed waste oyster shells with different water content of soils. Based on test results, eco-friendly Supporter manufactured from waste oyster shells were estimated as good resource materials for soft soil improvements. We got the conclusion by a series of experiment, It is verified that change of pH of soil is improved by mixing with oyster shells. The homogenization method for deducing apparent of oyster shells, which can consider micro-structure of mixed soil, is introduced. The improvement treatment leaded to enlarge fluctuation of soil moisture content. The effect of calcium concentration was good though improvement treatment of physical property. In addition, the crop yield in amelioration plots increased. It means that the increase of crop yield was caused by improvement of soil physical properties rather than improvement of calcium concentration.

• 산업진흥연구
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• 제1권1호
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• pp.143-149
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• 2016

본 연구는 물 재이용 연구개발 지원 및 물 재이용 활성화 정책 인식에 관한 영향관계를 검증하였다. 연구결과 물 재이용의 중요성 및 효과성을 높게 인식할수록 물 재이용 활성화 정책 필요성, 물 재이용 절수제품 사업체 지원 필요성 및 물 재이용 정부 투자 필요성을 높게 인식하는 유의한 영향관계가 나타났다(p<.001). 또한 남성일수록, 학력이 높을수록, 사무 단순노무 종사자보다 관리자 전문가 판매 및 기능 종사자일수록, 빌라보다 주택 거주자일수록, 월평균 수도요금이 4만원대 이상일수록 물 재이용 정책의 필요성을 높게 인식하는 경향을 보였다. 본 연구는 물 재이용 연구지원의 중요성 및 효과성 인식이 물 재이용 정책 필요성 인식에 미치는 영향을 분석함으로써 물 재이용 활성화를 위한 적극적인 투자 및 지원정책 마련에 근거를 제시한 데 그 의의가 있다.

• International journal of advanced smart convergence
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• 제7권1호
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• pp.42-47
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• 2018

Recently, as the demand for limited resources continues to rise and problems of resource depletion rise worldwide, the importance of renewable energy is gradually increasing. In order to solve these problems, various methods such as energy conservation and alternative energy development have been suggested, and biogas, which can utilize the gas produced from biomass as fuel, is also receiving attention as the next generation of innovative renewable energy. New and renewable energy using biogas is an energy production method that is expected to be possible in large scale because it can supply energy with high efficiency in compliance with energy supply method of recycling conventional resources. In order to more efficiently produce and manage these biogas, a biogas plant has emerged. In recent years, a large number of biogas plants have been installed and operated in various locations. Organic wastes corresponding to biogas production resources in a biogas plant exist in a wide variety of types, and each of the incoming raw materials is processed in different processes. Because such a process is required, the case where the biogas plant process is inefficiently operated is continuously occurring, and the economic cost consumed for the operation of the biogas production relative to the generated biogas production is further increased. In order to solve such problems, various attempts such as process analysis and feedback based on the feedstock have been continued but it is a passive method and very limited to operate a medium/large scale biogas plant. In this paper, we propose "CNN-based production yield prediction algorithm for increasing process efficiency of biogas plant" for efficient operation of biogas plant process. Based on CNN-based production yield forecasting, which is one of the deep-leaning technologies, it enables mechanical analysis of the process operation process and provides a solution for optimal process operation due to process-related accumulated data analyzed by the automated process.

• 패션비즈니스
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• 제23권6호
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• pp.86-100
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• 2019

This study analyzed the characteristics of vegan fashion produced by H&M and ZARA with respect to materials, design, development, production, and marketing to create social value. The results of this study are significant because they can be used as a reference to develop a vegan fashion market. Regarding the research method, this study assessed the concept and status of veganism through a literature review and examined vegan fashion case studies by analyzing official websites and media content. The study's scope covers the period from 2005, when H&M was the first SPA brand to create a vegan product line, until 2019. The characteristics of Global SPA's vegan fashion were as follows. Regarding materials, alternative materials were developed and an expanded use of organic materials was implemented. Regarding design, development was achieved through design collaboration and upcycling. In terms of production, an animal welfare policy was adopted and a sustainable supply chain was established. Marketing employed a campaign aimed at encouraging increased consumer participation. The findings regarding the social value of H&M and Zara's vegan fashion were as follows. First, a cyclical economy was realized through circular recycling in the entire process of resource selection, production, and waste disposal. Second, because product consumption indicated the importance of ethical consumption and sustainable consumer participation, corporate financial activities were created based on shared values to accomplish the social outcome. Third, collaborations with luxury brands or vegan fashion designers built a collaborative ecosystem in which vegan fashions were released and consumer participation campaigns were implemented.

• 광물과산업
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• 제25권
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• pp.1-10
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• 2012

본 연구에서는 경북 울진 보암광산의 리튬광을 대상으로 고품위 리튬 정광 생산을 위한 부유선별 연구를 수행하였다. 리튬의 근원광물은 Lepidolite (0.99% $Li_2O$)이며, 주요 맥석광물은 $SiO_X$를 포함하는 규산염 광물(quartz, muscovite)과 방해석(Calcite)이 존재하였다. 따라서 음이온포수제를 이용하여 방해석을 먼저 부유시켜 제거하고, 규산염 광물을 억제하고 리튬 광물을 부유시키는 공정을 적용하였다. 리튬광물 부유선별에서 포수제는 아민계통의 양이온 포수제(Armac-T, Armac-C, Armafloat-18, Armafloat-1597) 중 Armac-T가 가장 효과적이었다. 실험결과 최적 조건인 포수제(Armac-T) 100g/t, 기포제(AF65) 50g/t, 억제제($Na_2SiO_3$) 600g/t, (Lactic acid) 100g/t, 광액농도 20%solids, pH 5.5 그리고 정선횟수 2회에서 $Li_2O$의 품위와 회수율이 각각 4.33%와 80.3%인 결과를 얻었다.

• 한국건설순환자원학회논문집
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• 제3권2호
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• pp.146-151
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• 2015

순환골재는 건설폐기물을 재활용함으로써 자원절약 및 대체자원의 개발과 환경보호의 측면에서 국가 사회적으로 많은 이점을 가지고 있다. 하지만 낮은 밀도와 높은 흡수율을 가지는 저품질 순환골재는 구조용 콘크리트 골재로 사용되지 못하고 주로 저부가가치로 사용되고 있다. 고품질 순환골재를 생산하기 위해서는 골재와 골재에 부착된 구모르타르를 효과적으로 제거해야 한다. 최근 물리적 화학적 방법을 이용하여 구모르타르를 효율적으로 제거하기 위한 연구가 행해지고 있으나, 고품질 순환잔골재의 생산 조건에 관한 정량적 연구는 아직 부족한 실정이다. 따라서 본 연구에서는 고품질 순환잔골재를 생산하기 위해서 황산과 저속습식마쇄기를 이용하여 구모르타르를 효과적으로 제거할 수 있는 최적 조건을 제시하고자 하였다. 황산의 몰비와 골재비율에 따른 순환골재의 실험결과 밀도, 흡수율, 실적율은 기준을 만족시키는 결과를 나타내고 있는 것을 알 수 있었다.