• 농업과학연구
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• 제46권1호
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• pp.93-102
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• 2019

The materials of artificial soils in the production process of container seedlings have a great influence on plant growth. Peat moss, vermiculite, and perlite have been used as major components of artificial soils for many years; however, they could decrease carbon fixation carried out by the soil and cause environmental problems such as a change in the water quality. Thus, environmental friendly materials to replace them must be developed. The purpose of this study was to verify the optimum additive materials of artificial soils and their mixed ratios for the growth and seedling quality index (SQI) of Quercus serrata. Rice husk, mushroom sawdust, and pine bark were each used as an additive material and mixed into the growth medium at 10% and 20% of the total volume. There was no significant difference in the height growth of Q. serrata. The 20% mushroom sawdust decreased the root collar diameter by 23.4% compared to the control. The total dry weight was highest with the 10% rice husk and was significantly lower by 10.3% for the 20% mushroom sawdust compared to the control. Additionally, the SQI for all the treatments showed no tendency to increase compared with the control. Thus, this study showed the possibility of recycling biomaterials from agriculture and forest for seedling production. This method could reduce environmental problems and help eco-friendly nurseries to achieve a carbon negative impact by the recycling of by-products.

• 세라미스트
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• 제22권2호
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• pp.133-145
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• 2019

Thermoelectric energy conversion has attracted much attention because it can convert heat into electric power directly through solid state device and vice versa. Current research is aimed at increasing the thermoelectric figure of merit (ZT ) by improving the power factor and reducing the thermal conductivity. Although there have been significant progresses in increasing ZT of material systems composed of Bi, Te, Ge, Pb, and etc. over the last few decades, their relatively high cost, toxicity, and the scarcity have hindered further development of thermoelectrics to expand practical applications. In this paper, we review the current status of research in the fields of nanostructured thermoelectric materials with eco-friendly and low cost elements, such as skutterudites and oxides, for mid-high temperature applications, highlighting the strategies to improve thermoelectric performance.

• 한국의류산업학회지
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• 제19권3호
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• pp.259-266
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• 2017

In a contemporary fashion along with the advance of high technology, development of a new material is being increasingly emphasized and the need of creative convergence using a computer is being expanded. As a global designer who appeared through association between Japan and the West, Issey Miyake has been continually pursuing a new challenge and a solution using high technology, leading the globalization of Japanese fashion. This research aims at examining design characteristics of Issey Miyake collection's A-POC showing a new paradigm, that is, an innovative clothing manufacture system to input information on materials, colors and shapes into a textile machine based on the computer program and manufacture a cylindrical fabric for completion of seamless clothing without sewing or cutting. A-POC is evolving continually through the development of new materials including recycled fibers and organics together with diversification of processing technology. Besides, it shows design characteristics including an integrated manufacturing method, autonomy for customers' selection, practicality for comfortable wearing by the majority, environment friendly idea to reduce waste of fabrics and materials and a new presentation through convergence of exhibition concepts of modern art. This research on Issey Miyake's A-POC characteristics is expected to present a role of fashion designers in a new design idea and paradigm of contemporary clothing using high technology.

• 제어로봇시스템학회논문지
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• 제17권6호
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• pp.558-565
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• 2011

Various robot platforms have been designed and developed to perform given tasks in a hazardous environment for surveillance, reconnaissance, search and rescue, etc. We considered a terrain-adaptive and transformable hybrid robot platform that is equipped with rapid navigation capability on flat floors and good performance in overcoming stairs or obstacles. The navigation mode transition is determined and implemented by adaptive driving mode control of the mobile robot. In order to maximize the usability of wheel-track hybrid robot platform, we propose a terrain-adaptive and user-friendly remote controller and verify the efficiency and performance through its navigation performance experiments in real and test-bed environments.

• 한국정보기술응용학회:학술대회논문집
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• 한국정보기술응용학회 2005년도 6th 2005 International Conference on Computers, Communications and System
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• pp.207-210
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• 2005

Ubiquitous computing is one of the key technology areas in the "Project on Development of Ubiquitous computing and network technology" promoted by the Ministry of Science and Technology as a frontier business of the $21^{st}$ century in Korea, which is based on the new concept merging physical space and computer-based cyber space. With recent advances in Micro Electro Mechanical System (MEMS) technology, low cost and low-power consumption wireless micro sensor nodes have been available. Using these smart sensor nodes, there are many activities to monitor real world, for example, habitat monitoring, earthquake monitoring and so on. In this paper, we introduce web-based real environment monitoring system incorporating wireless sensor nodes. It collects sensing data produced by some wireless sensor nodes and stores them into a database system to analyze. Our environment monitoring system is composed of a networked camera and environmental sensor nodes, which are called Mica2 and developed by University of California at Berkeley. We have modified and ported network protocols over TinyOS and developed a monitoring application program using the MTS310 and MTS420 sensors that are able to observe temperature, relative humidity, light and accelerator. The sensed data can be accessed user-friendly because our environment monitoring system supports web-based user interface. Moreover, in this system, we can setup threshold values so the system supports a function to inform some anomalous events to administrators. Especially, the system shows two useful pre-processed data as a kind of practical uses: a discomfort index and a septicity index. To make both index values, the system restores related data from the database system and calculates them according to each equation relatively. We can do enormous works using wireless sensor technologies, but just environment monitoring. In this paper, we show just one of the plentiful applications using sensor technologies.

• 자원환경지질
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• 제53권6호
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• pp.781-792
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• 2020

망간단괴, 망간각, 해저열수광상 개발에서 필연적으로 발생하게되는 선광잔류물은 방대한 양과 잠재적인 독성으로 인해 관심이 증가하고 있지만, 아직까지 선광잔류물의 발생량, 물리·화학적 특성, 환경 유해성, 해양생태계에 미치는 영향 등에 관한 정보가 부족한 실정이다. 최근에는 선광잔류물의 친환경적인 처리 중요성이 인식되고, 그에 따른 저감/처리법이 강구되고 있다. 심해저 광물자원개발 시 선광잔류물이 선상에서 처리되지 못할 경우, 선광잔류물의 육상으로 운반 비용이 발생하고 육상 환경오염 문제를 해결해야하는 경우가 발생하게 된다. 따라서, 한국해양과학기술원에서는 1) 오염인자/환경영향, 2) 환경/생물 위해성 영향, 3) 입자 확산, 4) 선광, 5) 저감/처리(정화)를 친환경적인 선상에서의 선광잔류물 처리를 위한 주요 핵심 요소로 구분하여 선광잔류물의 유해성, 해양생태계에 미치는 영향, 오염 입자 확산 모델, 선광 및 정화처리 후보기술 등에 대한 연구를 수행하고 있다. 본 연구 결과는 향후 심해저광물자원 개발과정에서 발생할 수 있는 환경영향에 대한 과학적인 증거 확보를 통해 환경문제를 최소화 할 수 있는 연구 기반을 제시할 수 있고, 이는 다른 기원의 오염물 및 규제없이 방치되고 있는 육상 폐광산의 누출수 처리에도 적용할 수 있을 것이라 기대한다.

• 한국유기농업학회지
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• 제26권1호
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• pp.99-128
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• 2018

국내에서 주곡인 쌀은 재배 면적이 감소되고 있으나, 단위 면적당 생산량이 증가되고 쌀 소비는 급감하고 있는 상황에서 외국 쌀 의무수입량은 연간 409천 톤으로 쌀 생산조정 노력에도 불구하고 재고량이 누적되고 있다. 따라서 비상 시 식량안보를 위하여 현 재배면적을 유지하면서 생산량을 감축해야 할 필요성이 있다. 또한 농촌노동력의 노령화 및 지구온난화에 대응하여 노동력 절감과 생산비를 절감으로 농가 소득을 증대하고 친환경 유기농업으로 토양에 유기탄소의 저장력을 높이며, 온실가스 발생량을 줄이는 저탄소 농업기술을 개발, 지속가능한 농업환경을 조성하여 후손에게 물려주어야 할 책무가 있다. 쌀 수급안정에 대한 대안으로서 현 재배면적을 유지하면서 전국의 친환경재배 면적을 현재의 전남 수준인 17%까지 확대하는 1단계, 점차 확산하여 25%까지 확대하는 2단계, 중점확대로 친환경 면적을 35%까지 확대하는 3단계 시나리오를 설정하였다. 쌀 단가를 동일한 고정단가로 분석한 결과 1단계에서는 쌀 생산량은 6만톤 감축되고 생산비는 592억원 증가되며, 소득은 2,015억원 감소될 것으로 추정되었다. 2단계로 친환경농업을 점차 확산할 경우 쌀 생산량은 9만 톤 감축되고, 생산비는 1,221억원 증가되며, 소득은 3,137억원 감소될 것으로 추정되었다. 그리고 3단계에서는 쌀 생산량이 38만 톤 감축되고, 생산비는 2,220억원 증가되며, 소득은 4,645억원 감소될 것으로 추정되었다. 그리고 변동단가를 적용하면 친환경재배는 관행 일반재배에 비하여 소득은 11.5~14.5% 증가되며, 순소득은 -2.9~27.8% 증가되는 효과가 있다. 그리고 저탄소 벼 부분경운 동시 이앙 시범재배 단지 10 ha 조성 시나리오를 설정하여 분석한 결과, 단지별로 쌀 수량은 1.3~1.5톤이 감소되지만 쌀 생산비 감소로 농가소득은 증가되는 것으로 분석되었다. 따라서 생산조정 면적 8만 ha를 시행하는데 소요되는 정부 재정지출 예산을 감안하면 정부재정 범위 내에서 친환경 및 저탄소 농업 확대에 일정부분 지원이 가능할 것으로 생각되었다. 현재의 쌀 재고량 감축을 위한 재고관리에 일정한 한계가 있는 상황에서, 친환경 및 저탄소 농업으로 인한 생산비 증가나 소득감소를 재정적으로 뒷받침해 타작목에 영향을 최소화하면서 지속가능한 농업 환경 보전은 물론 식량안보와 소비자의 안전에도 기여하는 등, 친환경과 저탄소농업 확대는 적은 비용으로 큰 효과를 거둘 수 있을 것으로 기대된다.

• 한국잡초학회지
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• 제17권1호
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• pp.112-123
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• 1997

Chemical pesticides have been re used for a long time to protect crops from diseases, insects, and weeds ; ample and secure supply of foods in present days would not be possible without them. However, concerns on the risk of using chemical pesticides rising steadily in recent years forced discard many of them and seek an alternate, environment-friendly control strategies. Microbial pesticide is regarded as one of the most promising methods because if properly developed, it will be effective, cheap, and environment-safe. Currently, about 180 microbial pesticides are under development throughout the world and at least 20 of them including B.t. and antibiotics are registered in Korea. This paper discusses some of the successful examples, intriguing problems, and future prospects of microbial pesticides.

• Geomechanics and Engineering
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• 제12권5호
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• pp.753-770
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• 2017

The coagulation or flocculation of cohesive clay suspensions is one of the most widely used treatment technologies for contaminated water. Flocculated clay can transport pollutants and nutrients in ground water. Coagulants are used to accelerate these mechanisms. However, existing coagulants (e.g., polyacrylamide, polyaluminum chloride) are known to have harmful effects in the environment and on human health. As an alternative, eco-friendly coagulant, this study suggests ${\varepsilon}-polylysine$, a cationic biopolymer fermented by Streptomyces. A series of sedimentation experiments for various ${\varepsilon}-polylysine$ concentrations were performed, and the efficiency of sedimentation with ${\varepsilon}-polylysine$ was estimated by microscopic observation and light absorbance measurements. Two types of sedimentation were observed in the experiments: accumulation sedimentation (at 0.15%, 0.20%, 0.25% ${\varepsilon}-polylysine$) and flocculation sedimentation (at 0%, 0.1%, 0.5%, 1.0%, 2.0% ${\varepsilon}-polylysine$). These sedimentation types occur as a result of the concentration of counter ions. Additionally, the performance of ${\varepsilon}-polylysine$ was compared with that of a previously used environmentally friendly coagulant, chitosan. The obtained results indicate that flocculation sedimentation is appropriate for contamination removal and that ${\varepsilon}-polylysine$ functions more efficiently for clay removal than chitosan. From the experiments and analysis, this paper finds that polylysine is an alternative eco-friendly coagulant for removing chemical contaminants in groundwater.

• 한국유기농업학회지
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• 제21권2호
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• pp.233-246
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• 2013

본 연구에서는 친환경유기농자재를 사용하는 농업인을 대상으로 친환경유기농자재 구입실태 및 친환경유기농자재 안전관리방안에 대한 인식도 등을 조사하였다. 친환경 유기농자재를 구입하는 가장 큰 경로는 친환경농업단체였으며, 자재의 구입을 결정하는 가장 큰 근거는 '생산되는 농산물이 안전할 것 같아서'로 나타났다. 현재 친환경유기농자재에 대한 정보를 가장 많이 입수하는 경로는 '농업기술센터가 주최하는 교육'이었으며, 향후에도 국가 및 관련기관의 교육이나 홈페이지를 통해 정보를 제공받기를 희망하는 비율이 69.0%에 달하였다. 반면 '농자재판매상'을 통한 정보제공의 희망 비율이 매우 낮아 제도적으로 농자재 판매상 교육을 지원함으로써 농업인에게 정확한 농자재의 정보가 제공될 수 있도록 할 필요가 있다. 또한 국가기관에서 농업인들에게 제공하는 교육을 통한 안전성 관련 정보 제공의 필요성을 높게 인식하고 있었으며, 특히 농자재의 안전교육을 안전한 제품개발 다음으로 중요하게 여기는 것으로 조사되었다. 또한 조사대상 농업인은 친환경유기농자재의 유통기한 설정, 사용자 취급지침 설정과 독성구분 표기가 모두 필요하다고 응답하였다. 설문문항간 신뢰성을 검증하기 위하여 실시한 크론바하 알파계수는 0.699로 본 연구에서 설문한 문항에 대해 조사대상자들이 신뢰 있게 응답하였음을 알 수 있다.