• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2007.11a
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• pp.408-411
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• 2007

Many studies are currently in progress concerning about recycling due to the environmental problems and the drain of the resources. Nowaday, the problems on wastes are increasing thus studies on the construction waste are necessary which is the greater part of domestic wastes. And much more studies on the waste concrete which takes a large part of construction wastes are in progress but the studies on how to handle the waste concrete economically are unsatisfactory. This study suggests the analyzation of the economical way of handling the waste concrete by processes depending on the cost which needed in the each process, and can be the fundamental data of the future construction waste recycling system.

• Journal of Korean Home Economics Education Association
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• v.32 no.1
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• pp.89-105
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• 2020

This study aimed at analyzing the clothing management units of technology and home economics textbooks in terms of their contents related to Education for Sustainable Development(ESD). The inquisitive tendency of the textbooks was also examined adopting the modified Romey's method, because it is known as an important factor in increasing student's class participation in sustainable clothing management and inducing practical behavior. First, the learning contents of clothing management unit were analyzed according to the social/political/cultural, environmental, and economic perspectives of ESD. As a result, ESD contents from social/political/cultural perspectives (safety, and health and food), environmental perspectives (natural resources, energy, and environmental problem), and the economic perspectives (sustainable production and consumption) were identified, with a heavy focus on environmental perspective. Secondly, Romey's inquisitive content analysis method was modified to analyze texts, pictures/charts, and learning activities of the clothing management unit. In all textbooks, facts and definitions were the dominant types of contents, which means less opportunities for development of inquiry ability. In conclusion, the ESD contents of the clothing management unit are inclined to the environmental perspective, and it is necessary that textbook development would need to be balanced between three perspectives. Also, future textbook authors will need to improve the inquisitive tendency of the textbooks to encourage student participation in class and induce practical application in real life.

• Clean Technology
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• v.25 no.4
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• pp.289-295
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• 2019

Though the usage of vinyls and plastics produced from fossil fuels has been increasing in the world, the eco-friendly domestic disposal or recycling of waste vinyls has to be executed because the migration or importation of waste vinyls or waste plastics are globally prohibited. Even though the eco-friendly domestic disposal or recycling of waste vinyls and waste plastics should be developed, promising eco-friendly recycling methods are few because there are extraneous substances in waste vinyls and waste plastics. Also, conventional incineration and landfill methods result in secondary contamination and then increase disposal costs. Therefore, the selective elimination of extraneous substances or other materials included in waste vinyls and waste plastics could make valuable recycling or reuse possible. In particular, the novel hybrid process in which crushing and screening are simultaneously conducted in a rotary kiln type reactor can domestically maximize the material recycling or reuse. In this study, the feasibility study for a crushing/screening hybrid process developed in Korea was performed and evaluated in case of thermal recycling (TR) and material recycling (MR). The effect of various subsidies on economic efficiency was especially evaluated by means of domestic recycling plans. The incentive revenues from waste vinyl recycling and the incineration share of waste vinyls affected the net present values and internal rate of returns of the hybrid process.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.10
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• pp.640-647
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• 2018

Many harbor structures have been constructed, and some structures are now under construction in Korea, which is a peninsular state and a logistics hub in Northeast Asia. Expansions and extensions of existing harbors are also being planned to meet increasing natural disaster threats. Wave-dissipation concrete blocks are recycled or discarded based on the personal experience of engineers only, and there are no safety checks or criteria. To check the safety of used blocks, material evaluations were done by visual inspection of blocks on the ground and under water and from 20 non-destructive measurements of the rebound hardness test and 3 concrete core samples. Wave-dissipation blocks are sometimes fully or partially damaged in the process of transferring and mounting them or during construction. Therefore, a safety check is essential for recycling blocks with an evaluation of materials while considering the construction phases. To do this, a block was modeled with a 3D finite element method using ADINA, and impact analyses were done according to the transfer, mounting, and construction phases. From the results of the impact analyses and material evaluation, the safety checks and reasonable evaluation of used blocks were examined, and detailed construction methods are proposed. The methods are expected to maximize the reuse of used wave-dissipation blocks from an economical point of view.

• Resources Recycling
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• v.28 no.4
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• pp.15-22
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• 2019

Coal combustion products are generated during coal combustion and can be grouped into fly ash and bottom ash depending on collection methods. Fly ash and bottom ash can be recycled for various purposes based on their characteristics. Australia is the fourth largest coal production country in the world and reuses coal ash as cement, concrete, mine filler, and agricultural soil amendment. When fly ash is used as a supplement for cement and concrete, strength of the cement and the durability of the concrete can be improved. Use of coal combustion product for mine backfill stabilizes underground mine voids and stores a large amount of coal ash in the voids. Because of alkalinity of coal combustion products, it can neutralize acid mine drainage when used for mine backfill. In addition, it can be used as an agricultural soil amendment to improve acidity and physical properties of the soil and to supply plant nutrients. Recycling of fly ash in Australia will be further expanded because of its low trace element contents that can be toxic to plants and low radioactive element contents existing within soil background concentrations. The characteristics of coal combustion products are related to the characteristics of the coal used for combustion, and since Korea imports coal from Australia, Korean coal combustion products also can be recycled for various purposes.

• Resources Recycling
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• v.16 no.5
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• pp.19-24
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• 2007

Reefs are the marine structure that can give resting, inhabiting, feeding and nursing spaces for a variety of fishes. Usually artificial reefs are made of cement and steels respectively in Japan as well as in Korea. However since resources deficiency has been getting serious, other materials are taken into consideration for the basic bodies of artificial reefs. About 300 thousand tons of waste agricultural plastic films are generated every yew in Korea, but no effective recycling techniques have been developed. In this sense, artificial reefs made of waste agricultural plastic films are the most representative symbol of the recycled products in the Resource Recycling Era. In particular, since these reefs could be made of the semi-cleaned waste agricultural plastic films that still contain high portion of soil, it is very environmentally friendly not only in manufacturing process but also in using under water. Furthermore they have some evident advantages as follows; 1) high fish swarming effect 2) good initial attachment of the marine growths 3) extremely low corrosion to brine 4) easy adjustment of the gravity 5) economical manufacture, transportation and jettison 6) excellent safety to ecosystem caused by lower elution of toxic substances 7) good recyclable property after application and so on.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 2001.04a
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• pp.158-158
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• 2001

산업용 포장재의 주원료로서 이용되고 있는 국산골판지고지(KOCC)는 반복적인 재활용 으로 인하여 섬유장이 짧고 매우 각질화된 상태이며, 펄프 내 미세분 함량이 50%이상에 달 하고 있다. 또한 섬유의 표면이 인쇄잉크, stickies 및 각종 이물질로 오염됨에 따라, 섬유자 체가 보유하고 있는 섬유간 결합 능력이 저하된 상태이다. 국산 골판지 고지를 재활용한 골판지 원지의 생산 시 탈수성 및 강도 저하의 단점을 극 복하는 것은 생산성과 품질향상의 측면이외에 고지 재생을 촉진시킨다는 의미를 지니고 있다. 상기한 KOCC의 단점을 극복하는 방안으로 섬유분과 미세분의 적절한 분급을 통하여 초지 시 탈수저향을 감소시키고 더불어 종이의 강도를 개선하는 방안이 본 연구센터에 의해 고안되었다. 아울러 고온압착건조 처리를 활용한 종이의 물성 개선법이 국내에 이미 적용된 상태로 건조시간의 단축 및 종이의 제반물성을 개선시켜주게 되었다. 하지만 이미 열화된 KOCC에 고온압착건조 처리를 적용하여 밀도를 증가시킨다 할지라 도 천연의 UKP를 이용한 종이에 준 하는 강도를 얻는 데에 한계가 있었다. K KOCC 펄프의 섬유간 결합 능력을 개선시키기 위하여 본 연구에서는 Kneading처리와 지력증강제를 첨가를 함께 실시하는 방안을 검토하였으며, 고온압착건조된 골판지 원지의 표면에 코팅처리를 실시하여 그 효과를 분석하였다. 이를 통해 국산 골판지고지를 재활용한 골판지원지의 강도 극대화 방안을 탐색하고자 하였다.

• Elastomers and Composites
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• v.35 no.3
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• pp.227-235
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• 2000

This study focused on the recycling technology and application of waste polyurethane scrap($5{\sim}7mm$) and waste urethane form from the footware scrap. Firstly we suggest the waste polyurethane can be used as a component of medium for hydroponic rose culture. Secondly, recycled thermoplastic polyurethane(RTPU) was produced and blended it with high impact polystyrene(HIPS). And also, in order to extend application of recycling field, the former was produced with adding the amine foaming agent to RTPU/HIPS alloy. The main purpose of this study is to diverse of the recycling of the waste polyurethane.

• The monthly packaging world
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• s.259
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• pp.93-101
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• 2014

유니소재화(Uni-materialization)란 제품의 설계단계부터 유해물질 사용을 줄이고, 자원순환 효율성을 높이기 위해 재질 단일화 또는 단순화 하는 것을 말한다. 유니소재(Uni-material)는 재질의 수를 줄이거나 제품의 구조개선을 통해 자원관리 및 자원순환을 촉진하는 일련의 활동을 통칭하는 것으로 유니소재화는 국제환경규제를 선도하고, 친환경적, 지속가능성, 선순환 물질흐름이 가능한 혁신적인 개념으로서, 통합성(Unity), 범용성(Universalization), 독창성(Uniqueness)의 성격을 지닌다. 포장재산업에 있어서 유니소재화 제품은 서용 후 포장재가 재활용 공정을 저해하지 않고 포장재의 재활용을 통해 고부가가치의 재생 제품을 얻을 수 있도록 하는데 있으며 포장재의 기본 기능은 유지하면서 사용하는 포장 재질의 단순화 또는 단일 포장 재질 사용, 동일 재질의 포장재로 구성될 수 있도록 설계 단계에서 유니소재화를 고려한 것을 말한다. 지난 호에 이어 국제환경규제 기업지원센터(www.compass.or.kr)의 자료제공 아래, 포장재 산업에서의 유니소재화 사례를 재질단일화, 재질 단순화, 포장요서의 분리용이성 측면에서 사례별로 살펴보도록 한다.

• The monthly packaging world
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• s.260
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• pp.106-115
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• 2014

유니소재화(Uni-materialization)란 제품의 설계단계부터 유해물질 사용을 줄이고, 자원순환 효율성을 높이기 위해 재질 단일화 또는 단순화 하는 것을 말한다. 유니소재(Uni-material)는 재질의 수를 줄이거나 제품의 구조개선을 통해 자원관리 및 자원순환을 촉진하는 일련의 활동을 통칭하는 것으로 유니소재화는 국제환경규제를 선도하고, 친환경적, 지속가능성, 선순환 물질흐름이 가능한 혁신적인 개념으로서, 통합성(Unity), 범용성(Universalization), 독창성(Uniqueness)의 성격을 지닌다. 포장재산업에 있어서 유니소재화 제품은 서용 후 포장재가 재활용 공정을 저해하지 않고 포장재의 재활용을 통해 고부가가치의 재생 제품을 얻을 수 있도록 하는데 있으며 포장재의 기본 기능은 유지하면서 사용하는 포장 재질의 단순화 또는 단일 포장 재질 사용, 동일 재질의 포장재로 구성될 수 있도록 설계 단계에서 유니소재화를 고려한 것을 말한다. 지난 호에 이어 국제환경규제 기업지원센터(www.compass.or.kr)의 자료제공 아래, 포장재 산업에서의 유니소재화 사례를 재질단일화, 재질 단순화, 포장요서의 분리용이성 측면에서 사례별로 살펴보도록 한다.