• 한국재난정보학회 논문집
• /
• 제10권2호
• /
• pp.238-243
• /
• 2014

최근 세계적으로 환경오염이 심각해짐에 따라 환경보호의 일환으로 자원 재활용과 연관하여 시멘트의 대체 재료로서 산업부산물에 대한 관심이 높아졌으며, 특히 최근 경제성, 치수안정성 및 신뢰성이 우수한 고품질의 콘크리트 개발이 크게 요구되고 있는데 이를 증명하기 위한 실험을 수행한 결과는 다음과 같다. (1) 고로슬래그 미분말과 플라이애쉬 같은 혼화재를 혼합하여 사용할 경우 유동성이 개선되고 수화열 감소하는 효과가 있다. (2) 고로슬래그 미분말과 플라이애쉬 같은 혼화재의 량을 증가하면 장기강도 증진되고 건조수축이 감소한다, (3) 고로슬래그 미분말과 플라이애쉬 같은 혼화재의 혼입량을 증가시키면 수밀성 및 내구성 향상 등에 효과가 있는 것으로 나타나고 있다. 본 연구에서는 고로슬래그 미분말 및 플라이애쉬의 각각의 치환율과 혼입에 따른 콘크리트의 공학적 특성 및 혼입량의 임계치를 추정하고 현장 적용가능성을 검증하는데 목적이 있다.

• 대한방사선기술학회지:방사선기술과학
• /
• 제41권1호
• /
• pp.67-73
• /
• 2018

In this paper, risk assessment was conducted to verify self - disposal requirements by landfill for exempted incineration ash by using Resrad Ver.6.5 computer code. The result of risk assessment by landfill for the incineration by-product is that individual dose is $6.91{\times}10^{-2}{\mu}Sv\;y-1$ and collective dose is $3.475{\times}10^{-7}man-Sv\;y-1$. It proved that the result meets reference dose of individual dose $10{\mu}Sv\;y-1$ and collective dose 1 man-Sv y-1 for general public. According to the current 'Nuclear Safety Commission Notice [No. 2014-3]', it states that the exempted wastes can be disposed of by incineration, landfill and recycling. However, most of recently documents and papers related to exempted wastes are disposed of by landfill and recyling and it could not confirm the case of exempt by incineration. If the national consensus is derived and treating the waste by using process of incineration is activated, it could be considered to treat low level of radiation wastewater and activated carbon excluded from exempted waste because of nuclide $^3H$ and $^{14}C$.

• 공업화학
• /
• 제25권1호
• /
• pp.58-65
• /
• 2014

본 연구에서는 국내 4개 화력발전소에서 발생되는 석탄 바닥재를 이용하여 유황 고형화 성형물을 제작하였으며, 이를 이용하여 산업용 건자재 제조를 위한 실용적 데이터에 대하여 고찰하였다. 이러한 유황 고형화 성형물 제조를 위하여, 일축 스크류 형태의 연속식 혼합기를 사용하였다. 또한, 혼합기의 운전 특성으로 인하여, 1.2 mm 이하의 잔골재로서 석탄 바닥재가 사용되었다. 15, 20, 25, 30 wt%의 다양한 유황 농도의 성형물을 제조되었을 때, 압축강도 특성이 분석 되었다. 그리고 높은 생석회 함량의 석탄 바닥재가 사용되었을 때, 시제품에서 균열이 발생하였고 침투액의 pH가 12 이상을 나타내었다. 이러한 실험 결과들은 석탄 바닥재의 재활용 기술에 효과적으로 활용될 수 있을 것이다.

• Design & Manufacturing
• /
• 제13권3호
• /
• pp.35-40
• /
• 2019

As the consumer market in the cosmetic, vehicle manufacturing and aerospace industries grows, the demand for manufacturing industries using on injection mold technology. Also, such manufacturing technology of metal machining is expensive, and the shape is limited. Cosmetic cushion fact products are divided into outer relevant to the exterior of the product and inner containers containing the actual contents. In the case of the inner container, it needs to be combined with the upper and lower cases. As environmental regulations are strengthened internationally, the use of a large number of component parts can result in significant losses in recycling and economics. Therefore, this study aims to perform injection molding analysis through injection molding simulation to develop a cushion fact container that can be recycled through the unification of products and materials using polypropylene to cope with environmental regulations. In the case of injection molding conditions, Injection Time(sec): 4.5, Cooling Time(sec): 13, Resin Temperature($^{\circ}C$): 240, and Pressure(MPa): 30 were determined. The results of injection molding simulation according to the two design methods were compared with the sync mark which shows the problem of filling and injection molding.

• 한국태양에너지학회 논문집
• /
• 제28권4호
• /
• pp.10-16
• /
• 2008

The fire resistance of thermal insulation and interior finishing materials is recently much emphasized after the fire accident at the Icheon Cold Store in January 2008. Three kinds of thermal insulation are used in buildings. They are Organic, Non-organic and cellulosic insulation. Organic insulation such as polystyrene foam board and urethane foam has high thermal resistance but it has no fire resistance. While non-organic insulation such as rockwool and glassfiber has high fire resistance, it has lower thermal resistance than organic insulation. Cellulose insulation is primarily manufactured from recycled newsprint or cardboard using shredders and fiberizers. Despite of its environmental friendliness and high thermal resistivity, its domestic use has not much increased because of the prejudice that paper can easily burn. However, the cellulose insulation as a product is about 80 wt.% cellulosic fiber and 20 wt.% chemicals, most of which are fire retardants such as boric acid and ammonium sulfate. It is required to secure its fire safety for more consumption as a building insulation in Korea. Therefore, this study investigates the fire resistance of Korean cellulose insulation according to the rate of fire retardant and finally presents the optimum rate of fire retardant in cellulose as building insulation. The fire safety test was conducted according to the ASTM C 1485-00. The test results indicate that above 18 wt% of fire retardant is necessary to secure the fire safety of cellulose insulation.

• 한국철도학회논문집
• /
• 제10권5호
• /
• pp.596-599
• /
• 2007

전동차 내장패널에 대한 비교전과정평가를 실시하였다. ISO14044 표준과 에코인디케이터 99 방법론, SimaPro 7.0 software, Ecoinvent DB를 이용하여 전과정목록 DB를 구축하고 LCA를 수행하였다. 전동차 내장패널의 환경성 측면에 대한 일반적인 예상에 대하여 LCA를 통한 검증을 수행하였다. 전동차 내장패널의 중량이 환경성과 상관이 있음에도 불구하고 상대적 중요도는 높지 않았으며, Al 내장패널의 경우 사용단계의 환경영향이 가장 큼에도 불구하고 타 재질 내장패널에 비해 제작단계의 환경영향이 주요환경이슈로 도출되었다. Al 내장패널의 경우, 재활용으로 인한 환경편익이 크나, 장기적으로는 제작단계의 환경영향을 저감하여야 타 재질 대비 환경성 측면의 경쟁력을 강화할 수 있다.

• Biomaterials and Biomechanics in Bioengineering
• /
• 제4권1호
• /
• pp.21-32
• /
• 2019

Eggshell is a waste material after the usage of egg. In this work, biowaste chicken eggshells were used for preparing carbonated hydroxyapatite (HA) nanoparticles of high purity through aqueous precipitation method at room temperature. The eggshell-derived HA will be a cost-effective bioceramics for biomedical applications and an effective material-recycling technology. Additionally, mulberry leaf extract was used as a template to regulate the morphology, size and crystallinity of HA, and the effects of pH value were also examined. Characterization of the samples was performed by X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy. Scanning electron microscopy (SEM) was used to determine the size, shape and morphology of HA. The results indicate that only one phase of HA were synthesized in the both absence and presence of mulberry leaf extract at pH of 7 and above, while DCPD or DCPA/DCPD phase was observed at pH 4 condition. The crystallite sizes of the HA samples obviously decreased when adding mulberry leaf extract as a template, while they decreased gradually as the solution pH levels increased. With increasing pH level from 7 to 14, the rod-like HA nanoparticles gradually changed to spherical shape at pH 14. Note that, the obtained product is Mg and Sr containing A- and B-type carbonate HA at alkaline pH and it can be a potential material for biomedical applications.

• 한국포장학회지
• /
• 제24권3호
• /
• pp.131-140
• /
• 2018

전세계적으로 환경문제가 심각하게 대두되면서 선진국의 바이오 플라스틱 공급업체들은 재활용 규제와 이에 따른 소비자의 관심으로 친환경 포장재의 수요를 불러일으킬 것으로 전망하였다. 세계 각국의 환경 정책은 1순위 감량, 2순위 재활용, 3순위 재사용은 동일하고, 4순위로 분해성 재질 적용의 순서이다. 바이오 플라스틱 업체 등은 이러한 환경문제에 대응하기 위해 사탕수수, 옥수수와 같은 식물체를 활용해 여러 형태의 바이오 플라스틱을 출시해왔으며, 국내 업체들에서도 점차 이에 대한 관심을 높여가고 있다. 최근의 환경문제를 해결하기 위하여 바이오 플라스틱에 대한 산업적인 관심이 증가하고 있다. 기존의 바이오 플라스틱은 낮은 기계적 물성과 비싼 제조비용 문제가 단점으로 지적되어 왔으나, 석유 유래 플라스틱의 대안으로써, 바이오 플라스틱은 현재 단점을 해결하여 다양한 제품으로 개발되어 적용되고 있다. 바이오 플라스틱의 활발한 보급을 위해서, 세계 각국은 인증마크와 표준 제도를 운영하고 있으며, 본 총설에서는 최근의 국내외 바이오 플라스틱 규제현황, 인증 마크 및 식별 표시 동향에 대해 정리하였다.

• 한국농공학회논문집
• /
• 제61권1호
• /
• pp.85-93
• /
• 2019

The objective of this study is to assess the environmental effect of the reclaimed land drainage method using oyster shell through the Life cycle $CO_2$ assessment, and to evaluate the applicability in South Korea. In this Study, the life cycle $CO_2$ emissions of oyster shell (OS) and crushed stone (CS, as avoided product) were assessed and compared. The Life Cycle Assessment method was used for quantitative evaluation of direct or indirect environmental effects of OS recycling. $CO_2$ was selected as the evaluation target material, and the scope of assessment includes the acquisition of materials, processing, transportation, construction phases. Compared to using CS, 77.0% of $CO_2$ emissions in acquisition and processing, 47.0% in transportation and 6.5% in construction phase were reduced, respectively by using of OS. The maximum transportation distance of OS was estimated according to transportation distance of CS. OS has environmental advantages than CS within about 26 - 101 km from the source. OS was found to be applicable to reclaimed lands up to 810 ha, 3,910 ha from Tongyeong and Yeosu, respectively. In addition, the amount of OS that could be used as drainage material for reclaimed land was much higher than annual OS production of South Korea. Therefore, it is considered that OS is sufficient to be used as drainage material for reclaimed land in South Korea.

• 복식문화연구
• /
• 제29권5호
• /
• pp.679-693
• /
• 2021

The aim of this study was first to expand participation types in the field of beauty design by examining activities in the field, and second, to seek practical methods for addressing the important issue of social responsibility amid the current pandemic situation. Accordingly, social responsibility in design was examined through a review of previous studies. The features of practice domains and design performance fields were examined comparatively. As a result, it was found that social practices take place in various sectors, with sensibility toward the environment being escalated to a new level in the cosmetics industry. In terms of cosmetics enterprise practices, collecting, recycling, manufacturing, and retail networking has been established to reuse up to 95% of waste resources. Furthermore, ethical responsibility and participation concerning product and service waste resources are recommended, resulting in the supply of eco-friendly products in a virtuous cycle. In terms of systematic policy, even component transformation (such as organic certification and excluding toxic substances) is being carried out. However, it was difficult to identify such responsible activities in Korea; thus, systematic practice is needed. Designers take part in talent donation activities, and it was the sector they prefer the most. However, it is necessary to conduct studies on limitations such as venues equipped with cosmetics procedure equipment and public cosmetics sanitation and make systematic improvement, such that activities can be led with initiative from passive participation.