• Natural Product Sciences
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• 제25권2호
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• pp.150-156
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• 2019

Conventional extraction of oil and azadirachtin, a botanical insecticide, from Azadirachta indica involves defatting the seeds and leaves using hexane followed by azadirachtin extraction with a polar solvent. In order to simplify the process while maintaining the yield we explored a binary extraction approach using Soxhlet extraction device and hexane and ethanol as non-polar and polar solvents at various ratios and extraction times. The highest oil and azadirachtin yields were obtained at 6 h extraction time using a 50:50 solvent mixture for both neem leaves (44.7 wt%, $720mg_{Aza}/kg_{leaves}$) and seeds (53.5 wt%, $1045mg_{Aza}/kg_{leaves}$), respectively.

• 한국인터넷방송통신학회논문지
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• 제10권1호
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• pp.1-5
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• 2010

최근 녹색정보기술(G-IT), 녹색유비쿼터스기술(G-UT) 산업분야의 전문화에 따른 보안 방범 유지를 위한 국가 주요기관 시설물 또는 주요 산업 시설물 등의 보안 중요성이 강조되면서, 정부관공서 기업 및 군부대내에 최첨단 기술을 접목한 보안시스템(Security System) 구축이 절실히 요구되는 실정이다. 본 논문은 경비구역내의 경보발생장치로부터 신호를 다양한 형태의 통신기술로 수신하여, TCP/IP 망을 통하여 로컬 관제 센터와 원격관제 서버로 전송하는 녹색 유비쿼터스 지능형 무인경비 다중화장비에 관한 연구이다. 본 연구를 통하여, 무인경비 시스템의 통합 솔루션(Total Solution)을 확보하여 상호 시너지 효과 (Synergy Effect)가 가능하며, 국내외 시장 확대에 크게 기여할 것이다. 녹색 유비쿼터스 환경 구축 사업(Gu-Home, Gu-City, Gu-Health 등)중에서 방범/경비 분야에 적용할 수 있으며, 녹색 유비쿼터스 비전(Gu-Vision)을 제시할 수 있는 국가경쟁력을 갖춘 기업확장에 기여할 것으로 사료된다.

• KSBB Journal
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• 제28권6호
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• pp.428-432
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• 2013

The antimicrobial properties of Light-Emitting Diode (LED) are an area of increasing interest. The aim of this study was to evaluate the bactericidal effects of blue (peak at 456 nm), green (peak at 518 nm), red (peak at 654 nm) and blue-green combined (blue 456 nm : green 558 nm = 69:31) LED irradiation to pathogenic bacteria. For this, LED equipment providing power density of $10mW/cm^2$ was installed and plates were exposed to 0.9 or $3.0mW/cm^2$ to irradiate bacteria with 3.2 to $259.2mW/cm^2$ of energy density. As a result, blue and combined LED have shown bactericidal effects on Escherichia coli KCTC 1467 and Listeria monocytogenes ATCC 19115 after irradiation of $3.0mW/cm^2$ for 2 and 4 hr, respectively. Staphylococcus aureus KCTC 1916 was inhibited at 518 nm green LED irradiation. However, red LED irradiation showed no inhibitory effect to the other tested strains. Light technology that utilizes the bactericidal properties of blue (at 456 nm) and blue-green(blue 456 nm : green 558 nm = 69:31) combined LED may have potential applications in the food industry sector.

• STI Policy Review
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• 제5권2호
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• pp.65-95
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• 2014

The recent decades have seen a growing rate of international cooperation in science, technology, and innovation (STI) including in the field of green technologies. However, current approaches to national systems of innovation (NSI) have not kept up with this development. International aspects are rather treated as external conditions within which policymakers operate and respond but not influence. This paper tackles this problem by applying a refined NSI concept that includes an international dimension and complements past frameworks by focusing on those Korean government policies, actors, and activities relevant for the internationalization of STI. Austria and Korea have both formulated differing strategies to acquire international leading positions in the field of innovation and the development of green technologies. In the first step, the paper assesses Korea's international activities within the field of green technologies that transcend national boundaries and establish international connections. The government has still a strong influence on selecting technology areas for strategic funding but our findings show that international STI actors have difficulties in identifying the appropriate point of contact to initiate cooperation or apply for related funding. Second, an external perspective on Korea's international collaborations in the field of green technologies is offered. Austria has tentatively identified the East Asian country as a second-priority cooperation partner for its future STI internationalization activities. Interviews with Austrian stakeholders in the field of green technologies indicate a high interest in cooperation with Korea that is facilitated by a similar business culture based on personal networks. Moreover, researchers and policymakers referred to a shared need of small countries for intelligent decision-making processes regarding potential cooperation partners abroad. However, in order to enhance awareness, visibility and demand for Korean STI cooperation in European countries, more long-term funding programs featuring a more permanent point of contact should be introduced.

• 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%.

• KIEAE Journal
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• 제9권2호
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• pp.3-8
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• 2009

Green is an important keyword in the almost modern development. Green building is an alternative idea for the sustainable growth. Maximizing the green technological effect, this study provide you analyses of certified cases of LEED and green building strategies in accordance with use of building. And each changes on grades will show that development about green building technology with usage of building. We can get the accurate viewpoint through detailed studies about green buildings in USA.

• KIEAE Journal
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• 제6권2호
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• pp.59-66
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• 2006

Green Roof Systems are embossed that realize ecological architecture as a substantially alternative plan. So, a Purpose of the study is seeking to optimize expectation effect through the Green Roof System. we set possible object and propose the prototype on the basis of the existing Green roof System technologies. We visualize a proposed Prototype apply various materials and methods. and we analyse the effects of Green Roof System upon our City climate with use energy efficiency comparison the Green roof system with the Concrete Rooftop. We'll Provide the low data for The prospects of City climate improvement through the a ripple effect on Green Roof System and for activation of Green Roof Technology.

• 한국고분자학회지:고분자과학과기술
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• 제21권2호
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• pp.175-180
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• 2010

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2009년도 학술발표대회
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• pp.209-210
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• 2009

• 한국고분자학회지:고분자과학과기술
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• 제23권4호
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• pp.361-366
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• 2012