• 한국가정과교육학회지
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• 제21권1호
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• pp.141-155
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• 2009

교복 재활용 시장을 통한 교복 구매는 환경오염을 줄일 수 있고, 성장기의 청소년이 경제적으로 자신의 치수에 맞는 교복을 구매하고 착용할 수 있어 의복에 관한 만족감을 높일 있다. 따라서 본 연구에서는 중 고등학생의 교복 재활용 활성화를 위하여 서울, 경기 지역 8개교의 중 고등학생 741명을 대상으로 교복 구매 행동, 교복 재활용 시장에 대한 인식, 교복 재활용 시장 운영 실태에 대한 설문조사를 실시하였으며, 그 결과는 다음과 같다. 첫째, 교복 만족도는 현재 자신의 치수에 맞는 교복을 착용할수록 높게 나타나므로 교복 만족도를 높이기 위해서 자신에게 맞는 치수의 교복을 착용하는 것이 중요하다. 둘째, 환경의식과 환경보전행동이 높을수록 교복 재활용 인식이 높게 나타난다. 교복 재활용 시장 인식을 높이기 위해서는 환경의식과 환경보전행동을 높일 수 있는 체계적인 환경 교육과 재활용 행사의 활성화가 중요하다. 셋째, 재활용 교복을 구매하지 않은 이유로는 재활용 시장의 접근성과 위생 문제로 나타났다. 따라서 교복 재활용 시장 활성화를 위해서는 합리적인 의복구매행동, 환경의식과 환경보전행동을 고취할 수 있는 환경교육과 재활용 행사가 효율적으로 이루어져야하고, 재활용 교복 시장의 접근성과 홍보, 세탁과 수선 서비스의 개선이 필요하다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.183-187
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• 2001

Present states on reutilization of metal-bearing solid wastes in China including metal-containing gangue, red mud, nonferrous metallurgical slag or residue, arsenical slag, steel - iron slag, waste batteries, were described in detail. The wastes pile up at a large quantity, resulting in seriously potential harm to environment. Most of these wastes, however, contain valuable metals, which are regarded as important secondary resources for extracting metals. Waste slag and batteries with a high grade of metals are treated by a hydro-based and / or pyre-based method for extracting valuable metals. While gangue and waste slag with a low grade are as a raw material in architecture field. In the future, a novel technology, such as high-grads magnetization separation technique and biological technique, will be designed to treat these wastes for protecting environment and recycling valuable components. These wastes, furthermore, are synthetically reutilized to produce various architectural materials, including glass and ceramics.

• Fisheries and Aquatic Sciences
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• 제21권10호
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• pp.33.1-33.11
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• 2018

As a process for commercial application, production of reducing sugar, antioxidant, and DNA protective compounds from shrimp-shell powder was investigated in a fed-batch biodegradation using Bacillus cereus EW5. The fed-batch biodegradation was operated in a 5-L bioreactor for 96 h according to three times pulse-feeding strategy. On the basis of the equal working volume (3 L), the fed-batch biodegradation showed a better production of the target compounds than the batch biodegradation, with higher cell density and shortened biodegradation period. The maximum values of the target compounds were 0.297 mg/mL of reducing sugar, 92.35% DPPH radical scavenging activity, 98.16% ABTS radical scavenging activity, and 1.55 reducing power at $A_{700}$, which were approximately 12.1, 3.4, 5.2, and 8.4% enhanced, respectively, compared with those obtained from the batch biodegradation. The fed-batch culture supernatant also showed the enhanced DNA damage inhibition activity than the batch culture supernatant. As a result, the fed-batch biodegradation accompanied by high cell density could produce more useful compounds, enabling an increase in the reutilization value of shrimp-shell waste.

• Nuclear Engineering and Technology
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• 제51권2호
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• pp.345-355
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• 2019

Use of the reconstructed fuel assemblies from partially burnt nuclear fuel pins is analyzed. This reutilization option is a potential candidate technique to make better use of the nuclear resources. Standard two step method is used to calculate node i.e. fuel assembly average burnup and then pin by pin ${\eta}$ values are reconstructed to ascertain the residual reactivity in the used fuel pins. Fuel pins with ${\eta}$ > 1:0 are used to reconstruct to-be-reused fuel assemblies. These reconstructed fuel assemblies are burnt during the cycle 3, 4, 5 and 6 of a 1000 MW PWR core by replacing fresh, once burnt and twice burnt fuel assemblies of the reference core configurations. It is concluded that using reconstructed fuel assemblies for the fresh fuel affect dearly on the cycle length (>50 EFPD) when more than 16 fresh fuel assemblies are replaced. However, this loss is less than 20 days if the number of fresh fuel assemblies is less than eight. For the case of replacing twice burned fuel, cycle length could be increased slightly (10 days or so) provided burnt fuel pins from other reactors were also available. Reactor safety parameters, like axial off set (< ${\pm}10%$), Doppler temperature coefficient (<0), moderator temperature coefficient at HFP (<0) are always satisfied. Though, 2D and 3D pin peaking factors are satisfied (<1:55) and (<2:52) respectively, for the cases using eight or less reconstructed fuel assemblies only.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1998년도 가을 학술발표논문집(II)
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• pp.233-238
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• 1998

For substitution for crushed sand, high strength aggregate for cement and concrete using coal ash as a main material was prepared and then compared its physical properties with those of crushed sand. Effect of mix proportion change of raw materials on the property of aggregate was checked. On the basis of these experimental results we are going to comprehend the reutilization of coal ash and utilize a basic data for judging possibility the substitution of crushed sand.

• 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.

• 자원리싸이클링
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• 제8권4호
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• pp.57-63
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• 1999

재활용된 농업용 폐비닐과 목재부산물로부터 Wood-Polymer Composites (WPC)을 만들었으며, 또한 LLDPE 및 혼합 polyethylene으로 만들어진 WPC와 비교하였다. 접착성 향상제로 maleic anhydride를 사용하였으며, 이의 개시제로 dicumyl peroixde를 첨가하였다. 접착성 향상제로 maleic anhydride를 사용하였으며, 이의 개시제로 dicumyl peroixde를 첨가하였다. 제조된 WPC의 물성은 인장강도 시험으로 측정하였으며, 목재 및 접착성 향상제의 첨가량에 따라 분석하였다. 또한 파단면을 SEM을 이용하여 분석하였다. 목재의 양이 증가함에 따라 WPC의 신율은 감소하고, 탄성율은 증가하였다. 하지만 인장강도는 MA가 첨가된 경우에만 증가하였으며, MA 1% 첨가로 크게 증가하였지만 더 이상의 첨가는 효과가 없었다. 농업용 재활용 비닐로 제조된 WPC의 물성은 구매된 PE 수지로 제조된 WPC와 비슷한 값을 보였다.

• 한국환경보건학회지
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• 제23권2호
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• pp.106-114
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• 1997

When surfactants meet chlorine bleaches not only in the washing drums but also through the whole path from the stream to the river, it is not difficult to expect that they produce the harmful substances like DBPs. Furthermore considering wastewater that is contaminated by surfactants is used to discharge into drinking water sources via sewer system, it also can be imagined that residual surfactants would contribute to the some extent of DBPs' formation during chlorine disinfection in water treatment plants. Although the main behavior observed was the formation of chloroform during the reaction of LAS with free chlorine, the other manifest behaviors like the trends of pH, MBAS, free chlorine, the mole concentration of benzene ring and etc. were also investigated.

• 한국가구학회지
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• 제23권1호
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• pp.1-9
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• 2012

Sustainable furniture designs are expressed through reutilization, reuse or redesign of the whole of part of natural materials and existing products. These designs contain natural emotions and show those propensities such as uncertainty, integrity, essentiality and experimental natures. Designs that use natural materials such as wood, bamboo, cork, plants, stones and water have sufficient beauty in themselves and thus these materials are not specially processed but their essence is pursued in those designs. Of those materials, the natural material water is used to pursue the essence of aqua while presenting a new furniture design through an experimental method. The circularity of aqua shares its meaning with the circularity of sustainable designs. In addition, the liquidity of aqua will be grafted onto IT technology to express variable shapes in order to present a new direction of furniture designs.

• 환경위생공학
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• 제16권2호
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• pp.71-78
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• 2001

본 연구는 폐수 중 함유된 고농도의 LAS를 제거하기 위해 $FeSO_4$를 이용한 응집, 펜톤산화, 펜톤 공정 전.후에 응집공정을 조합시킨 Coagu-oxidation 및 Renton's Coagulation을 이용하여, 처리 시 최적 조건을 도출하고, 효율적인 화학적 처리방법을 검토하기 위해 수행되었다. 연구로부터 얻어진 결론은 다음과 같다. 응집공정은 pH 8, 응집제의 주입량 200mg/L인 조건에서, 펜톤산화는 pH 3, $H_2$$O_2$에 대한 ${Fe^2}^{+}$의 비가 1:1인 조건에서 최적효율을 보였다. Fenton's Coagulation 처리 시 LAS의 개환율은 높아졌고, 주입된 LAS농도의 73~96%가 제거되어 4가지 처리 방법 중 가 장 좋은 처리효율을 보였다. 따라서, LAS의 생물학적 처리 시 거품 및 부산물 생성 등에 의해 저해작용을 감안한다면, LAS가 다량으로 함유한 산업 폐수에서 화학적 처리방법의 도 입이 적절할 것으로 생각되며, 이들 중 Fenton's Coagulation을 유용하게 적용될 수 있을 것으로 판단된다.