• Journal of Radiation Industry
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• v.6 no.1
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• pp.41-47
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• 2012

A field tracer experiment using a radioisotope was conducted to analyze the transport and dispersion characteristics of pollutants in the coastal area near a Wolsung. A rod float including GPS was released to track the paths of radioisotope. NaI detector was installed to measure the released radioisotope from the boat, and measurements were performed with the real time. The measured tracer data by a field experiment can be used as the basic data for understanding the transport characteristics of pollutants and verifying numerical models near the offshore.

• Journal of Radiation Industry
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• v.12 no.4
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• pp.343-348
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• 2018

Preliminary study was perfomed to develop a biocompatible filter material using radiation energy. Electrosppined PLLA nano sheets were surface-modificated with hydrophilic groups(acrylic group) by using radiation. The physico-chemical and morphological characteristics of modified PLLA sheets were measured by ATR, SEM, contact angle, and hydrophilic (acryl group) introduction rate (TBO). As a result, there was no morphological(fiber structure) structure change due to radiation, and it was confirmed that an acrylic group was successfully introduced onto PLLA fiber sheet by radiation.

• Journal of Radiation Industry
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• v.12 no.4
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• pp.349-353
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• 2018

Metronidazole (MD), which is used as an antibiotic, is largely used as an oral and skin application agent, and has inhibiting effect on the production of the fungus causing malodor. However, the maximum drug inclusion concentration is 0.75% of skin ointment in commercially available. In this study, hydrogels containing high concentration of metronidazole were prepared by using radiation crosslinking technique based on biocompatible polymers, and release characteristics and antimicrobial properties were evaluated. This study was preliminary carried out to investigate whether it could be used effectively as antibacterial dressing materials.

• Journal of Korea Water Resources Association
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• v.54 no.3
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• pp.167-179
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• 2021

In order to characterize the mixing process of confluence for understanding the impacts of a river on the other river, it has been crucial to analyze the spatial mixing patterns for main streams depending on various inflow conditions of tributaries. However, most conventional studies have mostly relied upon hydraulic or water quality numerical models for understanding mixing pattern analysis of confluences, due to the difficulties to acquire a wide spatial range of in-situ data for characterizing mixing process. In this study, backscatters (or SNR) measured from ADCPs were particularly used to track sediment mixing assuming that it could be a surrogate to estimate the suspended sediment concentration. Raw backscatter data were corrected by considering the beam spreading and absorption by water. Also, an optical Laser diffraction instrument (LISST) was used to verify the method of acoustic backscatter and to collect the particle size distribution of main stream and tributary. In addition, image-based spatial distributions of sediment mixture in the confluence were monitored in various flow conditions by using an unmanned aerial vehicle (UAV), which were compared with the spatial distribution of acoustic backscatter. As results, we found that when acoustic backscatter by ADCPs were well processed, they could be proper indicators to identify the spatial patterns of the three-dimensional mixing process between two rivers. For this study, flow and sediment mixing characteristics were investigated in the confluence between Nakdong and Nam river.

• Journal of Environmental Science International
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• v.31 no.12
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• pp.1013-1025
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• 2022

This study was carried out to analyze water cycle characteristics and evaluate water retention function in Jeju Gotjawal forest from 2013 to 2017. The average ratio of throughfall, stemflow, interception loss in Seonhul Gotjawal (SH) and Cheongsu Gotjawal (CS) was 43.1%, 15.8%, and 41.1%, respectively. Rainfall-throughfall, rainfall-stemflow, and rainfall-interception loss were expressed as linear regression equation (p<0.001). The comparison results showed that SH was higher than CS (p<0.05), indicating that the canopy area had an important effect on the difference in stand structure. The average water resources retention rate of the Gotjawal region was 41.9%, which is similar to the total water resources retention rate (40.6%) of Jeju Special Self-Governing Province (JSSGP). Currently, the development of Gotjawal is in progress in JSSGP. The development of Gotjawal will lead to a decrease in the water resources retention rate due to changes in the surface environment such as an increase in impervious areas, which will affect the total groundwater content of JSSGP. Therefore, the conservation of the Gotjawal area is judged to be very important from the point of view of water conservation.

• 녹색21
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• s.10
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• pp.8-13
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• 2006

환경전문기자회는 이치범 환경부장관 등 환경부 실무과장들이 참여한 가운데 2007년도 업무보고와 간담회를 가졌다. 주요내용은 환경부와 산자부가 이중으로 REACH제도를 홍보하는 이유, 방치폐기물 처리대책 및 재활용산업 육성방안, 이천 하이닉스 증설 관련, 수변구역 매수토지 관리방안, 친환경상품 구매 촉진을 위해 관련 기관 및 단체가 함께하는 방안, 국장급 인사에 대하여 본부와 지방청을 고루 아우르는 방안, 음식물쓰레기 처리 통계 개선방안, 올해 심화될 것으로 예상되는 황사대책, 바이오디젤 확대 방안 등이 집중 논의됐다.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1999.10a
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• pp.362-363
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• 1999

1995년 12월 환경부는 대기환경보전법 개정법 제28조 2항에 "휘발성 유기화합물의 규제"에 관한 규정을 신설하고 1999년 1월1일부터 시행한다고 명시한 바가 있다. 그리고 환경부는 1996년 9월과 1997년 7월에 악취민원이 빈번했던 전남 여천시 여천국가공업단지와 울산의 국가공업단지 지역을 특별대책으로 지정하여 이 두 지역에 대해서는 서둘러 VOC에 대한 규제를 시작하였다.(중략)

• Environmental engineer
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• no.6 s.262
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• pp.14-21
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• 2008

환경부는 최근 사용 및 배출이 급속히 증가하고 있는 수질유해물질의 독성을 통합적으로 관리하고 미지의 독성물질로 인한 수생태계 위해성 저감을 위해 생태독성 배출관리제도를 도입했다. 이에 따라 2011년부터 산업폐수 배출시설 82개 종류중 석유정제품 제조시설 등 35개 종류의 시설과 폐수종말처리시설에는 생태독성 배출허용기준이 적용되며, 관할 행정기관에서는 각 배출시설에 대해 생태독성 배출허용기준 준수여부를 정기적으로 점검하도록 하고 있다. 이에 본지는 환경부 산업수질관리과의 도움으로 새로운 제도를 게재한다.(편집자주)

• The Transactions of the Korean Institute of Power Electronics
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• v.5 no.1
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• pp.63-71
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• 2000

원격조정 시스템에서 힘정보는 중요하다. 그러나 특수 응용 분야에 적합한 크기와 측정의 정확성을 가지는 힘 센서의 적용은 매우 어렵다. 더욱이 힘 정보의 전송으로 인한 시간지연으로 시스템은 불안정 되기 쉽다. 본 논문은 가상환경을 이용한 원격조정 시스템을 제안하였다. 시스템은 그래픽 시뮬레이션 처리부, 슬레이브 제어부 그리고 역감 제시부로 구성되어진다. 슬레이브 암이 작업물체와 접촉작업을 할 때 역감은 가상환경에서 계산되어지므로 힘 선세와 시간지연으로 발생되는 문제점을 해결 할 수 있다. 제안된 시스템으로 접촉작업에 대한 힘 제시 원격조정을 수행하였고, 실험결과를 통해서 안정된 접촉작업을 확인하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.07a
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• pp.123-124
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• 2016

본 논문에서는 사물인터넷 기법을 원격지에서 재배환경을 제어할 수 있는 온실 원격제어시스템을 제안한다. 온실원격제어시스템은 온실내의 환경정보를 계측하여 서버에 저장하고, 이 정보를 이용하여 사용자가 제어함으로서 최적의 재배환경으로 조절하고, 저장된 재배 환경정보를 활용하여 작물의 최적의 재배를 위한 기초 자료로 활용하도록 한다. 온실 원격 제어시스템을 웹과 연동하여 각종 기기를 이용하여 원격으로 제어함으로서 각 사용자들이 온실에 접근하지 않고 원격으로 환경을 제어할 수 있도록 구성하였다. 온실 원격제어시스템은 제어부, 통신부 그리고 계측부로 구성하였으며, 무선인터넷을 통하여 5초마다 제어신호를 확인하여 처리하고, 온도를 측정하여 서버에 저장하여 동작을 확인하였다. 따라서 본 논문에서 제안하는 온실 원격제어시스템은 최적의 생장환경을 지속적으로 제공하여 농가의 생산 효율성을 증대 시킬 수 있으리라 사료된다.