• 한국환경교육학회지:환경교육
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• 제24권2호
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• pp.54-69
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• 2011

The objectives of this study were to investigate the need for school uniform recycling and to review the school uniform recycling-related education. 231 female high school students were asked to answer regarding the wearing state of school uniform and their satisfaction level. 10 subjects in middle school technology/home economy were evaluated. As the result, the students wore 1~2 pieces of school uniform, which showed that it was hard to keep them clean by washing them often. The satisfaction level of school uniform was not high, The lowest item was the price. Therefore, to increase the satisfaction level of the school uniforms and also to increase the sanitary level of the school uniforms, it was advisable to purchase a recycled school uniform at cheaper prices to have an extra set. For a vitalization of the recycled school uniforms, the middle school technology/home economy subjects were reviewed. In the topic of "clothing acquisition plan and purchase", the themes of planned purchase, overconsumption of clothing and environmental pollution were discussed and included preferable behaviors for disposal. The topic of "clothing manufacturing and recycling" listed recycling the clothes that are not worn or exchanging them with neighbors as well as suggesting methods to illicit environment-friendly behaviors and carrying them out. However, some textbooks only briefly explained the methods of recycling and more detailed and practical methods need to be suggested in the curriculum. In addition, the contents regarding the environment in the clothing topic need to be supplemented more and more changes, such as related education plans or data development, are required. The objectives of this study were to investigate the need for school uniform recycling and to review the school uniform recycling-related education. 231 female high school students were asked to answer regarding the wearing state of school uniform and their satisfaction level. 10 subjects in middle school technology/home economy were evaluated. As the result, the students wore 1~2 pieces of school uniform, which showed that it was hard to keep them clean by washing them often. The satisfaction level of school uniform was not high, The lowest item was the price. Therefore, to increase the satisfaction level of the school uniforms and also to increase the sanitary level of the school uniforms, it was advisable to purchase a recycled school uniform at cheaper prices to have an extra set. For a vitalization of the recycled school uniforms, the middle school technology/home economy subjects were reviewed. In the topic of "clothing acquisition plan and purchase", the themes of planned purchase, overconsumption of clothing and environmental pollution were discussed and included preferable behaviors for disposal. The topic of "clothing manufacturing and recycling" listed recycling the clothes that are not worn or exchanging them with neighbors as well as suggesting methods to illicit environment-friendly behaviors and carrying them out. However, some textbooks only briefly explained the methods of recycling and more detailed and practical methods need to be suggested in the curriculum. In addition, the contents regarding the environment in the clothing topic need to be supplemented more and more changes, such as related education plans or data development, are required.

• 한국가정과교육학회지
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• 제26권2호
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• pp.1-14
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• 2014

의복 폐기와 같은 환경문제의 해결방안과 가정 경제를 도울 수 있는 방안으로 재활용 교복 시장의 활성화에 대한 인식이 높아지고 있다. 따라서 본 연구에서는 청소년의 교복 재활용 실태와 청소년들의 친환경 소비의식, 소비행동, 소비가치가 교복 재활용 태도에 미치는 영향을 살펴보고 향후 교복 재활용 시장의 활성화를 위한 제언을 하고자 하였다. 이에 서울 경기 지역의 426명의 중 고등학교 여학생들을 대상으로 설문조사를 실시하였으며, 그 결과는 다음과 같다. 첫째, 청소년들의 60%이상이 교복 재활용 시장에 대해 찬성 의견을 보이고 있지만 실질적으로 재활용 교복 구매를 할 수 있는 기회가 적은 것으로 나타났다. 둘째, 청소년들의 친환경 소비의식, 소비행동, 소비가치는 재활용 교복에 대한 태도에 유의한 영향을 미치는 것으로 나타났다. 따라서 재활용 교복 시장 활성화를 위해서는 청소년들의 친환경 소비의식을 높이고, 친환경 소비행동을 할 수 있도록 가정교과와 타 교과 교육과의 연계를 통해 청소년들의 환경친화적 가치관 교육을 강화하여야 하며, 학교-학생-학부모 모두가 참여하는 실질적인 교복 재활용 기회의 확대가 필요하겠다.

• 자원리싸이클링
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• 제19권1호
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• pp.27-32
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• 2010

리튬이온전지의 양극 전자전도도를 향상시키기 위하여 탄소제를 첨가할 때 기존의 혼합법과는 다르게 abrasive milling에 의하여 $LiCoO_2$ 양극 활물질에 흑연을 균일하게 분산시켜서 충방전시 용량감소를 줄이고자 하였다. 밀링 조건은 300 rpm, 10min으로 하였으며, 흑연 농도는 전기 전도성 향상과 용량의 관계를 고려해 볼 때, 1 wt% 경우가 가장 우수한 전극특성을 보여주었다. Abrasion법은 기존 혼합법에 비하여 10% 이상 capacity retention의 향상을 가져올 수 있었으며, 비가역적인 용량에 있어서도 초기 방전 용량의 효율도 높아 비가역 용량이 감소되는 효과를 얻을 수 있었다. 이는 첨가한 흑연이 균일하게 혼합되고 일부는 $LiCoO_2$ 표면에 코팅되어 전자전도도를 향상시키고 산화물인 활물질의 용해를 억제하기 때문으로 생각된다.

• 자원리싸이클링
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• 제16권6호
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• pp.10-19
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• 2007

폐리튬이온전지의 리싸이클링을 위하여 폐전지의 기계적 처리에 의한 Co의 농축과 습식처리에 의한 Co의 회수기술이 개발되었다. 전 연구에서는 폐전지 리싸이클링의 부가가치를 향상시키기 위하여 Co 농축 침출액으로부터 양극활물질을 재합성하는 공정으로 citrate precursor combustion법을 제안하고 가능성을 확인하였다. 기존의 전극제조 공정에서는 활물질인 $LiCoO_2$와 첨가제인 탄소의 비중 및 크기 차이로 균일한 혼합이 이루어지지 않으므로 충방전 용량이 이론용량에 비하여 매우 낮고 또한 싸이클이 반복될수록 용량이 크게 감소하는 경향을 보였다. 본 연구에서는 합성된 $LiCoO_2$ 전극특성을 향상시키는 일환으로 합성공정의 개선을 통하여 초미립 $LiCoO_2$을 합성하였으며, 탄소 첨가시 혼합법의 개선에 의하여 우수한 충방전 특성을 갖는 리튬전지용 양극을 개발하였다.

• 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.

• Membrane and Water Treatment
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• 제15권3호
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• pp.107-115
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• 2024

This study proposes the recycling of MVS as a value-added product for the removal of phosphate from aqueous solutions. By comparing the phosphate adsorption capacity of each calcined adsorbent at each temperature of MVS, it was determined that the optimal heat treatment temperature of MVS to improve the phosphate adsorption capacity was 800 ℃. MVS-800 suggests an adsorption mechanism through calcium phosphate precipitation. Subsequent kinetic studies with MVS-800 showed that the PFO model was more appropriate than the PSO model. In the equilibrium adsorption experiment, through the analysis of Langmuir and Freundlich models, Langmuir can provide a more appropriate explanation for the phosphate adsorption of MVS-800. This means that the adsorption of phosphate by MVS-800 is uniform over all surfaces and the adsorption consists of a single layer. Thermodynamic analysis of thermally activated MVS-800 shows that phosphate adsorption is an endothermic and involuntary reaction. MVS-800 has the highest phosphate adsorption capacity under low pH conditions. The presence of anions in phosphate adsorption reduces the phosphate adsorption capacity of MVS-800 in the order of CO 3 2-, SO 4 2-, NO 3- and Cl-. Based on experimental data to date, MVS-800 is an environmentally friendly adsorbent for recycling waste resources and is considered to be an adsorbent with high adsorption capacity for removing phosphates from aqueous solutions. This paper combines the advantages of gray predictor and AI fuzzy. The gray predictor can be used to predict whether the bear point exceeds the allowable deviation range, and then perform appropriate control corrections to accelerate the bear point to return to the boundary layer and achieve.

• 대한치과기공학회지
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• 제34권2호
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• pp.75-81
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• 2012

Purpose: All ceramic crown, made from zirconia instead of metal for core material, is recognized the best esthetical prosthesis. Recently, high-priced zirconia blocks and expensive CAD/CAM machines come into use for making zirconia core. In this study, slip casting process is adapted to evaluate the possibility of the recycling the remained parts of zirconia block after machining. Methods: Remained zirconia blocks were reduced to powders with zirconia mortar, and screened with 180 mesh sieve. Passed powders were ball milled under various conditions to obtain the optimum zirconia slip for casting. Solid casting method was used for casting the specimens with plaster mold. Formed specimens were dried and biscuit fired at $1,000^{\circ}C$ for 1 hour. Biscuit fired specimens were finished with exact shape of square pillar. Finished specimens were fired from $1,200^{\circ}C$ to $1,550^{\circ}C$ at $50^{\circ}C$ intervals for 1 hour. Linear shrinkage, apparent porosity, water absorption, bulk density, and flexural strength were tested. Microstructures were observed by SEM. Results: Above examinations indicated that the optimum firing temperture was $1,500^{\circ}C$, and when fired at this temperature for 1 hour, apparent porosity was 0% and flexural strength was 680MPa. SEM photomicrographs showed uniform 200~300nm grain size, which is equal with microcture of sintered commercial zirconia block. when compare 24% linear shrinkage of cast specimen with 20% linear shrinkage of CAD/CAM machined block, it was estimated that the size controlling of cast core was not so difficult. Conclusion: According to the all of this experimental results, the cast zirconia core produced from the remained parts of zirconia block was possible to use for all ceramic denture.

• 복식
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• 제37권
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• pp.133-148
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• 1998

This study presents the aspects and changing process of the habiliment from the National Liberation up to now by analyzing the articles of costume found in$\ulcorner$Maeil Shinmun$\lrcorner$from Jan. 1. 1946 to Dec. 31. 1996. In the period of 1946~1959, the political and economic conditions through the National Liberation and Korean war deteriorated and the interest in costumes were weakened. But the economic recovery and social stability in the middle of the 50's made the lost interest in costumes increase. From 1960 to 1969, the high economic growth was achieved by“Five year plans for Economic Development”and the progress of mass media, transportation, communication and education brought western culture to our society. It spread rapidly and changed the way of life and the sence of value. These phenomenon led to a great transition on the Korean costume culture in the 60's In 1970~1979, the articless of costume made a change from the 60's, which focused on women's wear, and tuned to one including general costumes not only women's wear but also men's wear due to the women's social roles, the unisexmode and diverse costume. In 1980~1989, the growth of the consumption, the banning of the school uniform, Asian Games(1986) and Olympic games(1988) caused the high qualification, personalization and diversification in the fashion industry. Further more, the traditional-oriented trend with korean culture was emphasized. It pursued the modernization of the traditional Korean Costume, Hanbok, to introduce the unique Korean Beauty. From 1990 to 1996, in the era of international-ization and open door policy, the competition of nations became intense and the comprehention about environmental destruction highlingted the concerns on ecology. The recognition of environmental protection and recycling were reflected in the fashion. It prevailed that the pursuit of personalization,. diverse style, practicality and the fashion leader called generation appeared.