• 한국해양환경ㆍ에너지학회지
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• 제13권1호
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• pp.43-46
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• 2010

중소형 폐 선박으로부터 배출되는 FRP를 재활용하기 위한 방법으로 층상으로 배열된 로빙층과 매트층을 분리하는 것은 에너지 면에서나 환경적인 면에서 많은 장점을 가지고 있다. 비록 로빙층과 매트층은 모두 유리섬유로 이루어져있으나 수지함유량의 차이와 유리섬유의 조직형태의 차이로 인하여 재활용 용도는 매우 달라지고 있다. 그러나 로빙층은 매트층에 비해 얇은 두께로 존재한다는 이유로 인해 로빙층을 FRP에서 분리할 때 기계가 자동적으로 층간의 차이를 인식하기는 매우 어렵다. 따라서 이 추출과정에서 많은 로빙층의 손실과 공정의 난이도에 의한 처리시간 지연 등의 문제가 발생한다. 본 연구에서는 유리의 구성비가 다른 두 층의 화학적 성질의 차를 이용하여 광학적으로 층간 인식이 가능한 방법을 모색하였다. FRP에 대해 유리의 $SiO_2$와 반응하는 플루오르산(HF) 용액으로 처리한 후 수용성 염료를 도포한 경우 두 층간의 차별화가 확연하게 일어났다. 본 연구는 이 결과를 이용하여 폐 FRP의 면포분리 공정의 효율성을 극대화 할 수 있는 시스템을 개발 하였다.

• Journal of Advanced Marine Engineering and Technology
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• 제33권2호
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• pp.313-321
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• 2009

The construction of fiber-reinforced plastic (FRP) boats is decreasing trend since the application of international regulations on the control of marine environmental pollution, which recommended the use of environmentally friendly materials. The aluminum alloy used with material for ship is a superior to FRP. It is environmental friendly, easy to recycle, and provides a high added value to fishing boats. However, the welding for Al alloy materials have many problems, such as deformation by welding heat and effect of the working environment. In this paper, it was carried out welding by robot with welding material of ER5183 and ER5556 on 6061-T6 Al alloy for ship. The mechanical and electrochemical characteristics evaluated for specimen welded by robot. The cathodic polarization trend for the base metal and welding metal showed the effects of concentration polarization due to oxygen reduction and activation polarization due to hydrogen generation. The hardnesses of welding zone and heat affected zone are lower than that of base metal. At the result of tensile test, the specimen welded with ER5183 presented excellent property compared with ER5556.

• 한국공간구조학회논문집
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• 제11권3호
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• pp.67-76
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• 2011

주각부는 상부의 강구조와 철근콘크리트조 기초의 접합부로써 매우 중요한 부분이다. 현재 국내외 강구조 골조 공사에서 사용되는 주각부의 형식은 크게 구분하여 노출형 주각부 근권형 주각부, 매입형 주각부라고 할 수 있다. 이 중에서 부재의 재사용 및 재활용을 최우선으로 고려한다면 노출형 주각부가 가장 유리하다. 본 연구에서는 이러한 노출형 주각부의 시공 성능 및 역학적 성능을 획기적으로 개선할 수 있는 형태의 강구조 선형상 노출형 주각부를 개발하고, 구조 성능 평가를 위한 탄소성 재하실험을 수행하였다. 그 결과 개발된 신형상 노출형 주각부는 수평 방향과 수직 방향의 시공 오차를 현장에서 간단히 흡수하여 기존 노출형 주각부의 시공 불량을 사전에 방지함으로써 구조 성능을 발휘한다. 또한 에너지 흡수형 고력볼트를 사용함으로써 변형 성능이 증가함을 알 수 있었다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2002년도 학술.기술논문발표회
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• pp.17-22
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• 2002

This Waterproofing Material which mainly consisted of 2 components of waste tire chip powder and waste glass powder. This Study is abut development of waterproofing Material, There is not tried in domestic. The most Motive of this Study wishes to recycle resources and get the economic performance for waterproofing Material The result of this Study is as followings. (1) Dense waterproofing floor is formed between waste tire chip by Coupling Agent(the most effective method to encourage adhesive strength and raise cohesion of material by combination.) (2) Expected to bring effect to shorten construction period at spot application potentially space-time in moisture aspect. Also, shortening effect of construction period and spot work are considered to be gone efficiently selecting pre-mix construction method. (3) This development Waterproofing material has elasticity that nature side compatibility of cement ingredient and plastic Emulsion have when utilize and constructs waite resources (being waste tire chip and waste glass powdered).

• 에너지공학
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• 제29권3호
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• pp.34-41
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• 2020

Used disposable diapers have been considered for a long time as a type of waste difficult to recycle and valorize due to their composite nature including plastic, cellulose pulp, a super absorbent polymer and either urine, feces or both. Therefore, the fate of disposed diapers often is either incineration or landfill burial which both have various adverse environmental impacts. However, used disposable diapers contain nutrients: cellulose is an organic matter while urine and feces contain non negligible amounts of nitrogen, phosphorus and potassium which are primary nutrients included in most chemical fertilizers used in agriculture. In a scope of waste recycling and valorization, this study focuses on developing a method to achieve nutrient solution extraction from used disposable diapers. The experiment essentially consists in shredding the diapers and letting them macerate in solutions of sodium hydroxide with various concentrations to allow breaking down of the cellulose and super absorbent polymer and release of urine and feces before sterilizing the solutions in an autoclave to remove potential coliform bacteria. At the end of the experiment, a set of parameters is measured for the final solution to identify concentrations of nutrients as well as presence or absence of harmful substances. Results are discussed and directions for future studies are suggested, which include mechanization of the diapers shredding process or added aeration to enhance nitrification and absorption of extracted nutrients from plants.

• 한국의류학회지
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• 제34권3호
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• pp.529-539
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• 2010

The environment and green are critical issues for businesses in the $21^{st}$ century. This study examines product assortments of eco-friendly products, green marketing strategies, and the marketability of Trashion products among fashion brands. Data were collected through an interview method from eight fashion brands that were actively conducting green marketing. The general activities of green marketing were to produce eco-friendly products and/or an economical support for environmental groups or green conservation campaigns. Eco-friendly products included organic cotton products, well-being products made of bamboo or beans, goods made of recycled plastic bottles, and Trashion items. The first reason was to improve the brand image, then take social responsibility, and last participate in the environmental movement. However, the price of green products and supplies of eco-friendly fabrics were the most challenging issues for fashion businesses. The marketability of Trashion products was directly opposed and managerial implications for green marketers were discussed.

• 산경연구논집
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• 제8권3호
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• pp.5-9
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• 2017

Purpose - While sustainability is based on the argument that the world's resources are finite and their demand will ultimately surpass supply, entrepreneurship on the other hand argues that there are inherent opportunities to address this through conserving, recycling, switching to more renewable resources and making effective use of available finite resources. Research design, data, and methodology - In response to the lack of scientific information on the outcomes of entrepreneurship in rural Nigeria, this paper surveys the benefits (social, economic and environmental) of women engagement in waste plastic bags recycling in Adamawa State of Nigeria. A descriptive research design was adopted and data was collected from 26 respondents with the use of a semi-structured questionnaire, which was analyzed using descriptive statistics and presented in frequency tables. Results - Results indicated that 21 women have gained employment, who would have remained unemployed; 80.8% of who make profits below 10000 Naira per month and collectively, they recycle 179.3kg of waste polythene bag per month. Conclusions - It was recommended that the women should be further their education; adequate records of costs and sales should be kept; and savings should be encouraged among them.

• Elastomers and Composites
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• 제38권2호
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• pp.103-121
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• 2003

The application of powerful ultrasound to rubber recycling is a very recent field of study. An ultrasonic field creates high frequency extension-contraction stresses by acoustic cavitation. The breakdown of rubber network occurs primarily around pulsating cavities due to the highest level of strain produced by high-power ultrasound. Stronger reductions of cross-link density were observed at a higher pressure, indicating an important role of pressure during ultrasonic recycling. Visible bubbles were observed during ultrasonic treatment as a proof of acoustic cavitation. Shearing effect has a significant influence on improving the efficiency of ultrasonic treatment. After the ultrasonic treatment, the cross-link densities of NR/SBR blends were lower than those of NR and SBR due to the reduced degree of unsaturation and chemical reactions. Carbon black fillers increase the probability of bond scission during ultrasonic treatment, due to the restricted mobility. The mechanical properties of ground tire rubber (GRT)/HDPE blends were improved by ultrasonic treatment and dynamic revulcanization. Ultrasonic treatment of GRT in the presence of HDPE matrix was found to give better mechanical properties due to the chemical reactions between rubber and plastic phases.

• 한국세라믹학회지
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• 제47권5호
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• pp.445-449
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• 2010

The purpose of this study is to improve recycling rate of the waste glasses by investigating bloating mechanism. In this study, we use waste glass(W/G) and hard clay(H/C) as raw materials. The artificial lightweight aggregates were formed by plastic forming($\phi$=10 mm) and sintered by fast firing method at different temperatures(between 700 and $1250^{\circ}C$). The physical properties of the aggregates such as bulk specific gravity, adsorption and microstructure of surface and cross-section are investigated with the sintering temperature and rate of W/G-H/C contents. As the result of the bulk specific gravity graphs, we can found out the inflection point at content of W/G 60 wt%. From the microstructure images, we considered the artificial lightweight aggregates content of W/ G over 60wt% are distributed numerous micro-pores by organic oxidation without Black Core and the artificial lightweight aggregates of W/G below 60 wt% are distributed macro-pores with Black Core.

• 자원리싸이클링
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• 제16권2호
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• pp.56-62
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• 2007

본 연구에서는 마찰하전형정전선별법을 적용하여 폐플라스틱 종말품으로부터 회수된 고비중 산물에 대한 재질분리 실험을 수행하였다. 하전장치의 재질선정을 위한 하전특성 연구결과, PP가 고비중 폐플라스틱의 재질분리에 가장 효과적인 하전재질로 확인되어, PP재질을 이용한 cyclone 하전장치를 개발하였다. 본 연구에서 개발된 cyclone 하전장치를 이용한 재질분리 실험결과, 최적 실험조건에서 PET의 품위와 회수율이 각각 98.5%와 86.2%인 결과를 얻어, 종말품 heavy group 폐플라스틱의 재활용을 위한 재질분리 기술을 확립하였다.