• 한국유기농업학회지
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• 제28권4호
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• pp.477-490
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• 2020

In this paper, the factors influencing the differentiation of environment-friendly agricultural products from the intention of environment-friendly farming experience were analyzed through logit analysis. The main analysis results are summarized as follows. First, the contents to experience in environment-friendly agricultural innovation in Jeonnam province are environment-friendly agricultural product harvesting (33.8%), making food using environment-friendly agricultural products (24.1%) and environment-friendly ecological experience (20.1%). Second, significant variables affecting the intention to experience environment-friendly agriculture were analyzed as whether they were members of the consumer cooperative, whether they were children under the age of two, and whether they were children under the age of high school. In other words, it was analyzed that the more members of the consumer cooperative, the more families with children under the age of two, and the more families with student children, the more likely they are to participate in environment-friendly farming experiences. Third, significant variables that affect the recognition of the differentiation of environment-friendly agricultural products in Jeonnam province were found to be environment education and dual income. In other words, it is analyzed that consumers who receive environment education and dual-income families are more likely to recognize environment-friendly agricultural products in Jeonnam province differently than in other regions.

• 세라미스트
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• 제22권2호
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• pp.122-132
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• 2019

Wearable electronic devices with batteries must be lightweight, flexible and highly durable. Most importantly, the battery should be able to self-generate to operate the devices without having to be too frequently charged externally. An eco-friendly energy harvesting technology from various sources, such as solar energy, electromagnetic energy and wind energy, has been developed for a self-charging flexible battery. Although the energy harvesting from such sources are often unstable according to the surrounding environment, the energy harvesting from body movements and vibrations has been less affected by the surrounding environment. In this regard, flexible piezoelectric modules are the most attractive solution for this issue, because they convert mechanical energy to electrical energy and harvest energy from the human body motions. Among the various flexible piezoelectric modules, piezoelectric nanofibers have advantages when used as an energy harvester in wearable devices, due to their simple manufacturing process with good applicability to polymers and ceramics. This review focused on diverse flexible piezoelectric nanofibers and discusses their applications as various energy harvesting systems.

• 한국버섯학회지
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• 제16권3호
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• pp.140-146
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• 2018

Pleurotus eryngii is one of the most commercially important mushrooms cultivated in Korea. However, the shelf-life of the fruiting body is short, limiting its export. A new hybrid strain H17 of P. eryngii was developed to extend the shelf-life by mono-mono crossing between monokaryotic strains derived from DanBi and KNR2774. Although the cultivation period of H17 was slightly longer than that of the reference cultivar Kenneutari No.2, the quality did not change and remained normal after a period of 65.0 days at $4^{\circ}C$. This result was significantly different from that of the reference cultivar Kenneutari No.2. Analysis of the genetic characteristics of the new hybrid strain H17 revealed a different profile from that of the parental and reference cultivars when random amplification of polymorphic DNA (RAPD) primers was used. These results demonstrate that H17 is a new cultivar with improved storability after harvesting.

• 한국산림과학회지
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• 제111권4호
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• pp.473-481
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• 2022

우리나라의 친환경벌채는 생태계, 경관 및 산림재해 방지 기능을 유지하도록 실행되고 있으며, 벌채 시 임목 중 일부를 남겨 임지가 일시에 드러나는 것을 방지하고 있다. 경기도 포천시 신북면 심곡리에 위치하고 있는 연구대상지에서 벌기령에 이른 41~50년생 일본잎갈나무림이 2017~2019년에 걸쳐 2 년간 벌채되었다. 벌채 3 년 후 산림 내 유기물 분포 및 변화를 측정하여 벌채에 따른 산림 내 유기물의 동태를 규명하는 것을 목적으로 하였다. 2020년 6월부터 2021년 1월까지 지상부 바이오매스, 낙엽층, 낙엽생산량 및 토양(0-30m 깊이)의 유기물 함량을 측정하였다. 친환경벌채가 이루어진 일본잎갈나무림의 지상부 바이오매스는 142.22 t ha^-1에서 44.20 t ha^-1로 감소하였다. 낙엽층의 유기물 함량은 미벌채구에서 32.87 t ha^-1였으며, 친환경벌채구에서 23.34 t ha^-1로 감소하였다. 연간 낙엽생산량은 미벌채구에서 4.43t ha^-1yr^-1였으며, 친환경벌채구에서 1.16t ha^-1 yr^-1로 감소하였다. 토양용적밀도는 미벌채구 토양 B층이 0.97 g cm^-3였으며 친환경벌채 후 1.06 g cm^-3로 증가하였다. 토양유기물 함량은 미벌채구 토양 A층에서 11.5%였으며 벌채 후 12.8%로 증가하였다. 토양유기물 총량은 대조구와 친환경벌채구에서 각각 245.21 t ha^-1과 263.92 t ha^-1로 유의성 있는 변화를 보이지 않았으나, 전체적으로 벌채 후 증가하는 경향을 보였다. 일본잎갈나무림 내 유기물 총량은 406.48 t ha^-1였으며 친환경벌채로 인하여 338.21 t ha^-1로 감소하였다. 벌채 후 산림 내 지상부 유기물 비율은 13.1%로 감소하였으며, 토양유기물은 78.0%로 증가하여 산림 내 유기물 분포가 변화한 것으로 나타났다. 본 연구의 결과 친환경벌채는 지상부에 축적된 탄소가 크게 소실된 반면 토양내에 저장된 탄소량의 증가로 전체적으로 산림 내 탄소 저징량의 감소 규모가 완화된 것을 보여주고 있다. 이 결과는 기후변화에 대응할 수 있는 산림 관리 방안의 마련을 위한 기초가 될 것으로 생각된다. 본 연구는 친환경벌채 후 3 년이 지난 시점에서 얻은 결과를 보여 주었으며, 이후의 산림 변화를 파악하기 위하여 산림 유기물의 변화와 수목 생장에 대한 추가연구가 필요한 것으로 보인다.

• Journal of Semiconductor Engineering
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• 제1권1호
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• pp.13-30
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• 2020

Radio frequency (RF) energy harvesting technology have become a reliable and promising alternative to extend the lifetime of power-constrained wireless networks by eliminating the need for batteries. This emerging technology enables the low-power wireless devices to be self-sustaining and eco-friendly by scavenging RF energy from ambient environment or dedicated energy sources. These attributes make RF energy harvesting technology feasible and attractive to an extended range of applications. However, despite being the most reliable energy harvesting technology, there are several challenges (especially power conversion efficiency, output DC voltage and sensitivity) poised for the implementation of RF energy harvesting systems. In this article, a detailed literature on RF energy harvesting technology has been surveyed to provide guidance for RF energy harvesters design. Since signal strength of the received RF power is limited and weak, high efficiency state-of-the-art RF energy harvesters are required to design for providing sufficient DC supply voltage to wireless networks. Therefore, various designs and their trade-offs with comprehensive analysis for RF energy harvesters have been discussed. This paper can serve as a good reference for the researchers to catch new research topics in the field of RF energy harvesting.

• 한국식품저장유통학회지
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• 제30권5호
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• pp.833-846
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• 2023

양파는 한국인의 식생활에 필수적인 채소로 항산화작용, 심혈관계 질환 예방, 항혈전, 혈당 저하, 항염과 항알레르기등의 다양한 유용 생리활성이 알려져 있다. 하지만 생산-수요의 불균형으로 인한 문제가 매년 나타나고 있다. 따라서 본 연구에서는 양파의 이용성을 극대화하고자, 양파 전초의 우수성을 확인하고 양파의 사용 목적에 따른 수확시기 확립을 위해 생육시기별 영양성분, 기능성성분 및 항산화 활성을 분석하였다. 일반성분은 탄수화물을 제외하고 6월 수확시기에 가까워질수록 감소하는 경향을 보여 전초가 구근보다 높은 함량을 나타냈다. 유리당은 glucose > fructose > sucrose로 구성되어 있으며 6월 수확시기에 증가하여 구근이 전초보다 높은 함량을 나타냈다. 무기성분은 P, Cu를 제외하고 구근보다 전초가 높은 경향을 보였다. 유기산은 malic acid > citric acid > oxalic acid로 구성되어 있었고 전초가 구근보다 높은 함량을 보였다. 총플라보노이드 함량은 생장할수록 유의적으로 감소하여 6월 수확한 구근에서 가장 낮은 함량을 나타냈다. 플라보노이드 화합물은 spiraeoside > quercetin > isorhamnetin로 구성되어 있었고, isorhamnetin을 제외한 두 성분은 전초가 구근보다 더 높은 함량을 나타냈다. 총엽록소 함량은 생장할수록 감소하였지만 전초가 구근보다 높은 함량을 나타냈으며, 총 thiosulfinate 함량은 생장할수록 감소하다 다시 증가하여 초기 전초와 구근은 비슷한 함량을 나타냈다. 항산화 활성 역시 전초가 구근보다 높은 함량을 나타냈다. 양파의 품종별로 플라보노이드 화합물과 항산화 활성을 비교한 결과, 모든 품종에서 25주에 수확한 전초가 6월 수확한 구근보다 값이 더 높은 것을 알 수 있었다. 결론적으로, 유리당과 일부 무기성분을 제외한 영양성분과 기능성성분, 항산화 활성은 6월 수확한 구근보다 이전에 수확한 전초에서 그 함량이 높아, 6월 수확기 이전 시기의 양파 전초는 식품으로서 활용가치가 우수하다고 판단되었다. 특히 21주 이전의 전초는 영양성분이 대파보다 뛰어났으며, 23주 이후의 전초는 기능성 성분 및 항산화 활성이 구근과 대파보다 더 뛰어난 것을 확인할 수 있었다. 따라서, 양파 전초는 영양성분 및 녹색이 목적인 가공 제품에 이용하기 위해 21주 이전에 수확하고, 기능성성분 및 항산화 활성이 목적인 가공 제품에 이용하기 위해 23주 이후에 수확하는 것이 바람직 할 것으로 생각된다.

• 한국버섯학회지
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• 제14권2호
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• pp.64-69
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• 2016

큰느타리버섯 품종 육성을 위해 품질이 우수한 특성을 지니는 큰느타리버섯 KNR2598과 경도가 우수한 특성을 지니는 큰느타리버섯 KNR2610 모본으로부터 단핵균주를 분리 한 뒤 단포자간 교잡을 통해 고품질의 저온 저장성이 우수한 신품종 "단비5호"를 육성하였다. 신품종의 균사 생육 적정온도는 $25^{\circ}C$이며 자실체 발생 적정 온도는 $15{\sim}16^{\circ}C$ 이었다. 솎음 재배에서 발이소요일수를 포함한 수확소요일수는 대조품종인 큰느타리버섯 2호에 비해 0.5~1.7일 정도 빠른 특성을 보였다. 갓 색깔은 중간수준의 갈색이며 대 색깔은 흰색을 나타내었다. 갓모양은 우산형으로 850cc 플라스틱 병재배에서 한 개체의 평균무게는 $90.4{\pm}16.9g$이었다. "단비5호"와 대조품종간의 RAPD 분석결과 서로 다른 DNA 밴드양상을 보여 주었으며 대치배양을 통해 두품종간에 대치선을 확인 하였다. "단비5호"의 경우 $4^{\circ}C$에서의 저장성이 대조품종 대비 24.6~30.6일 이상 길게 유지되는 특성이 있어 수출적합형 품종으로 가치가 있을 것으로 기대된다.

• 한국실내디자인학회논문집
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• 제23권3호
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• pp.153-163
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• 2014

The eco-friendly elements are important for new construction and renovation and redevelopment of the buildings. The green buildings are related with minimizing environmental pollution and how to live with nature throughout the entire process of demolishing and building. The purpose of this paper is to study on eco-friendly business buildings in the trend of mandatory green building certification system. The analysis of this paper is comparative studies on practices at eleven domestic eco-friendly business buildings through site survey on design framework of green buildings. The design framework of eleven this buildings is six kinds of skills on technical, renewable, ecological, cultural, healthy, social. The eleven this buildings in the new & renewable energy and IT technology of technical sector are satisfied with the framework. But, domestic most advanced eco-friendly business buildings are placed difference between almost the two times on the lower buildings at comparative evaluation. The three of this buildings are gratified rainwater harvesting and waste recycling systems for renewable and recycle. The buildings have an excellent aspects of technology and ecology. The benefits of this buildings are related with future compulsory zero energy house to take technical advantage of renewable energy. However, the buildings reflecting the regional culture types is insufficient. The buildings should be supplemented as follows. This buildings are need to have the social enhancement programs and design for convenient space of community residents, through health and comfort of on workplace. Moreover, this buildings have features of coexisting with human beings and nature friendly with the aim of realizing the sustainable development. The social enhancement programs through regional cultural aspects with ecology are related with individual and community livings in harmony, non-hierarchical communal lifes. The development of the cultural aspects provide for consensus about the local community and creating sustainable communities. Thus, The buildings are to have energy saving, pleasant and healthy living environment and interactive individual and community livings in harmony.

• 한국포장학회지
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• 제28권3호
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• pp.193-199
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• 2022

Sustainable energy supplies without the recharging and replacement of charge storage device have become increasingly important. Among various energy harvesters, the triboelectric nanogenerator (TENG) has attracted considerable attention due to its high instantaneous output power, broad selection of available materials, eco-friendly and inexpensive fabrication process, and various working modes customized for target applications. The TENG harvests electrical energy from wasted mechanical energy in the ambient environment. TENG devices are very likely to be used in next-generation renewable energy and energy harvesting. TENG devices have the advantage of being able to manufacture very simple power devices. In this experiment, various organic dielectrics and inorganic dielectrics were used to improve the open voltage of TENG, Among the various organic dielectrics, Teflon-based FEP, which has the highest electron affinity, showed the highest open voltage and Al electrode was fabricated on Teflon substrate by sputtering deposition process. And AAO (Anodized Aluminum Oxide) nanostructures were applied to maximize the specific surface area of the TENG device. The power generation of TENG within the acceleration level (0.25, 0.5, 1.0, 1.5 and 2 G) and the frequency range (5-120 Hz) of the domestic transport environment was up to 4 V.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제44회 동계 정기학술대회 초록집
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• pp.631-631
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• 2013

Battery has major drawbacks including its size and life expectancy, and environmental problem. As an alternative, energy harvesting is emerging as a potential solution to replace battery along with more energy-efficient IT devices. The idea of harnessing energy from our living environment is sustainable, semi-permanent, and eco-friendly. Also, unlike battery, energy harvester does not require much space to store energy. Therefore, energy harvesting can provide a better source of power for small, portable, and wireless devices. Among various ways of harvesting energy from our surroundings, triboelectricity is chosen due to its potential to be miniaturized, and efficient. Triboelectric effect occurs as two different materials with different polarity of charge separation come into contact through friction, and then become separated so that electric potential difference is achieved. In this research, such characteristic of triboelectricity is used as a way to convert ambient mechanical energy into electric energy.Series of recent researches have shown promising results that the triboelectric energy harvester can be simple and cost effective. However, sufficient electricity level required to operate mobile devices has not yet been achieved.In this research, our group focuses on the design and optimization of triboelectric energy harvesting device to enhance its output. By using maskless lithography to pattern Kapton film and silicon substrate, which is used as a mold for PDMS thin layer, and sputtering metal electrodes on each side, we fabricate and demonstrate different designs of triboelectric energy harvester that utilizes the contact electrification between a polymer thin film and a metal thin foil. In order to achieve optimized result, the output voltage and current are measured under diverse conditions, which include different surface structure and pattern, material, and the gap between layers.