• 한국정밀공학회지
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• 제27권7호
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• pp.79-86
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• 2010

The environment-friendly abrasive materials of starch series has a wide range of application value such as deburring of plastic injection products, paint exfoliation and surface treatment of painted products and polishing, etc. In this study, an experiment of paint exfoliation was performed by using the environment-friendly abrasive materials made of cheap starch, and its performance was reviewed. By adjusting the grit size of abrasive materials, nozzle pressure, nozzle feed and number of nozzle repetition, paint could be exfoliated effectively. In this experiment, it was found that the most suitable condition was grit size 0.75~1.0 mm, nozzle pressure 0.4 MPa, nozzle feed 5 mm/min and number of processing repetition 2 times.

• 현장농수산연구지
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• 제16권1호
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• pp.37-53
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• 2014

본 연구의 목적은 농업후계자들이 대학에서 전문교육을 받고 귀향한 후 친환경농업을 실천하는 데 따른 어려움을 파악하고 이를 해결할 수 있는 방안을 검토하는 데 있다. 본 연구의 조사대상은 전체 한농대 졸업생 감귤농가 24명 중에서 친환경농업을 실천하고 있거나 실천 경험이 있는 총 8명 중 조사에 응한 6농가이며, 개방형 설문지에 의한 사례 연구 방식으로 분석되었다. 사례농가들의 영농실태 분석결과, 이들은 기후변화 및 시장개발에 대응하기 위해 작목전환과 경영의 다각화를 도모하고 있으며, 농법으로는 한 농가만이 무농약 수준의 친환경농업을 희망하고 있고 대부분 유기재배를 지향하고 있다. 사례농가의 경영비 분석결과, 자재비 기준으로 물재비는 더 적게 들지만 관행농업과 같은 수준의 상품성을 얻기 위해서는 노력비가 더 들어가야 하는 것으로 조사되었다. 친환경농업의 생산량은 관행농업에 비해 20-50% 정도 감소하며, 판매가격은 10-50% 높은 것으로 나타났다. 친환경 감귤농가의 애로사항으로는 유기농업 기술 부족과 친환경농업에 적합한 판로부족이며 규모확대를 위한 토지구입이 어려운 것은 제주 농업이 갖는 특수한 제약조건이다. 졸업생 농가의 친환경농법으로의 전환은 부모님과의 합의가 어려운 문제로 나타나고 있으며, 친환경농업 기술을 자문 받을 수 있는 지역의 창구가 없다는 점이 지적되었다. 졸업생농가가 친환경농법으로 전환하기 위해서는 농업기술원 및 농업기술센타를 중심으로 친환경농업 선진농가와의 연계를 통해서 지속적인 기술교육과 자문이 이루어질 수 있도록 가칭 '제주 친환경 생태 유기농업 포럼'을 구성하여 기술자문 및 현장애로 기술이 개발 보급될 필요가 있다. 친환경 감귤의 적정 가격과 판로를 확보하기 위해서는 제주 지역의 로컬푸드와 연계된 판매활동과 육지의 로컬푸드와의 연계도 필요하다. 안전성과 신선도의 가치를 소비자가 신뢰하고 구매할 수 있는 다양한 유통채널을 확보해야 한다. 대부분의 사례농가의 소득증대를 위해서 장기적으로 체험이나 관광과 연계할 수 있는 6차농업의 농장경영을 구상할 필요가 있다. 다양한 품종의 감귤을 도입하여 다양성을 확보하고 체험 및 관광과 연계시켜 생태 유기농장으로 발전해 가야 한다. 이를 위해서는 국내외 선진 농장을 벤치마킹하고 정책사업과 연계할 수 있는 기반을 조성해야 한다. 한국농수산대학에서는 제주지역 졸업생들이 친환경 유기농업을 통해서 경영의 안정을 꾀하고 지역농업의 리더가 될 수 있도록 연구기관 및 보급기관과 연계하여 제주지역에 맞는 지원 프로그램을 개발하고 이를 바탕으로 졸업 후에도 지속적으로 새로운 정보와 기술을 제공해야 한다.

• 한국분말재료학회지
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• 제29권4호
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• pp.291-296
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• 2022

The green body of WC-Co cemented carbides containing polymeric binders such as paraffin, polyethylene glycol (PEG), and polyvinyl acetate (PVA) are prepared. The green density of the WC-Co cemented carbides increases with the addition of binders, with the exception of PVA, which is known to be a polar polymeric substance. The green strength of the WC-Co cemented carbides improves with the addition of paraffin and a mixture of PEG400 and PEG4000. In contrast, the green strength of the WC-Co does not increase when PEG400 and PEG4000 is added individually. The compressive strength of the green body increases to 14 MPa, and the machinability of the green body improves when more than 4-6 wt% paraffin and a mixture of PEG400 and PEG4000 is used. Simultaneously, the sintered density of WC-Co is as high as 99% relative density, similar to a low binder addition of 1-2 wt%.

• 한국가구학회지
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• 제25권3호
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• pp.198-204
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• 2014

Aggravation of natural environment, improvements in income, internet diffusion, spread of five-day work a week, and population aging seem very different from each other. However they boil down to consumption. These culture patterns are changing into environment-friendly and productive housing culture. In other words, people might tend to have frequent contacts with not only environment-friendly housing in bustling cities but also woods that is environment friendly materials in their leisure time. In the period of people young and old alike are in favor of woodcrafts, this study was conducted for giving information to who speicalized in woodcrafts. Furthermore, the study shows that other countries also added grain and figure to woodcrafts for visually appealing.

• 한국식품영양학회지
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• 제33권2호
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• pp.142-148
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• 2020

The purpose of this study was to investigate the prevalence, toxin gene profiles, and enterotoxin producing ability of Bacillus cereus isolated from environment-friendly vegetables and good agricultural practices (GAP) vegetables. A total of 49 vegetables including 40 environment-friendly vegetables and 9 GAP vegetables were tested. The Vitek 2 system was used to identify B. cereus and the PCR was used to detect 6 toxin genes, respectively. B. cereus was detected in 34 (69.3%) of 49 vegetables and the prevalence of B. cereus in GAP vegetables (44.4%) was lower than in the environment-friendly vegetables (75.0%). The detection rates of entFM, nheA, hblC, and cytK enterotoxin genes, respectively, among all isolates were 100%, 97.0%, 88.2%, and 73.5%, respectively. All of the isolates had at least one or more enterotoxin gene and 20 isolates (58.8%) had hemolysin BL enterotoxin producing ability. The risk of food poisoning from the environment-friendly vegetables and the GAP vegetables has been shown as constant. Thus, it is necessary to expand the supply of GAP vegetables showing lower B. cereus contamination than the environment-friendly vegetables. The characteristics of the environment-friendly vegetables and the GAP vegetables that must be consumed after cleaning should be disseminated to consumers regarding food poisoning prevention.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2007년도 정기학술발표대회 논문집
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• pp.844-847
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• 2007

전 세계적으로 환경에 대한 관심이 고조되는 가운데 각 산업에서의 환경보호를 위한 노력이 꾸준히 진행되고 있다. 건설분야에서도 환경보존 을 노력이 지속되고 있는 실정이다. 이에 본 논문에서는 친환경성, 고내구성, 가변성, 갱신성능 그리고 쾌적성 등의 종합적인 성능을 갖춤으로써 미래형 건축물의 기본요소가 될 수 있는 친환경 지능형 건축 Component system 제안을 위한 요소기술 분석에 초점을 맞추었다. 친환경 지능형 건축 Component system 개발을 위해 요구되는 성능을 파악한 후 그 성능을 구현시키기 위한 요소기술을 분석한 결과, SI주택과 Home Automation 기술이 주요 요소기술로 도출되었다. 그리고 이론 및 문헌 고찰을 통해 도출된 요소기술의 개념 및 개발동향에 대하여 대해 살펴본 후 최종적으로 이러한 기술요소의 융합을 통한 친환경 지능형 건축 Component system 을 제안하였다.

• 한국환경농학회지
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• 제33권3호
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• pp.184-188
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• 2014

BACKGROUND: White stain symptom caused by Acremonium acutatum and Trichothecium roseum, is one of the most important diseases on the grape. This disease occurs national-wide in Korea and causes irreversible damage on grape, at harvest season. This study was conducted to develop environment-friendly control method against white stain symptom. METHODS AND RESULTS: Environment-friendly materials were tested for control activity against A. acutatum and T. roseum in vitro and in vivo. The effect of environment-friendly materials against white stain symptom on grape in farmer's greenhouse was examined. The materials, NaDCC and sulphur, were sprayed three times on the leaves and fruit of grape at the two sites of farmer's field, Anseong and Hwaseong of Gyeounggi. To evaluate control effect of NaDCC and sulphur against white stain symptom, the disease severity was investigated after the two materials were sprayed from the disease onset three times at the 7-day intervals. NaDCC showed efficacy of 59.71% for Kyoho and 72.26% for Campbell-Early, and sulphur showed 78.31% for Koyho and 66.19% for Campbell-Early. CONCLUSION: We were selected sulphur and Sodium-Dichloroisocyannurate(NaDCC) based on the results of experiments in vitro. In field test, sulphur and NaDCC showed suppressive effect in the white stain symptom of grape. These results suggested that NaDCC and sulphur selected can be used as control agents for controlling white stain symptom on grape.

• 전기학회논문지
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• 제67권2호
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• pp.186-193
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• 2018

Generally, it is difficult to operate moveable-weir due to the expensive cost of the facility management and manpower consumption. Also, when it is installed in a remote area, there is a problem that the cost of connection for power system increases as well as the operating cost. Therefore, this paper proposes an optimal design algorithm to replace an existing power system with an Eco-friendly power supply system for movable-weir using PCS, PV module and lithium-ion battery. Also, this paper proposes a modeling method of environment-friendly power supply system for a movable-weir based on the PSCAD/EMTDC S/W and implements 5[kW] prototype environment-friendly power supply system. As a result of the performance test using the S/W modeling and the prototype system, it is confirmed that the proposed system has stable characteristics in the independent operation mode and the interconnection mode.

• 한국포장학회지
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• 제9권1호
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• pp.25-32
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• 2003

Packaging has been regarded as a environmental problem because of its relatively high portion of municipal solid wastes. Especially, cosmetic packaging has been focused because of characteristics of cosmetic packaging. Cosmetic products are highly sensitive products that pursue the beauty differently from other products. Cosmetic packaging materials are difficult to be recycled. Purpose of this study is to suggest the method to improve the environmental friendly packaging of cosmetic products. This study contains the major governmental policies on the cosmetic packaging in terms of environment issues in Korea, and suggested methods to develop the environmental friendly packaging of cosmetic products.

• 수산해양기술연구
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• 제45권3호
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• pp.144-150
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• 2009

The choice behavior of the octopus in response to the environment-friendly colored sinker for octopus driftline and the sinker's fishing effect were studied under experimental conditions in the water tank and the field. The colors of the sinkers used for the experiment are white, black, yellow and green. Artificial baits are attached to the sinkers in order to attract the octopuses in the experiment. In the water tank experiment, two sinkers of two different colors are placed in a compartmentalized corner of the rectangular tank, and a CCD camera records the choice behaviors of the octopuses to the colored sinkers. In the field experiment, the catch investigation of octopus for each colored sinker was conducted 14 times in total by using 2(A, B) commercial fishing boats at the coast of Gangneung within 30m of depth in 2006. The number of colored sinkers per operation was a total of 24-40 pieces with the same number of sinkers individually for four colors. As a result, it was found that the octopus selected white the most followed by black and yellow in their choice of colored sinkers in the water tank experiment, and green was the lowest in their choice. Even in the field experiment, the sinkers of white and black showed a higher catch of octopus than the sinkers of yellow and green.