• 대한공간정보학회지
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• 제21권1호
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• pp.11-18
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• 2013

낙동강 하구에 위치한 을숙도는 생태환경의 중요한 지역으로서 국제적인 해안습지 지역이기도 하다. 을숙도 지역은 많은 변화를 통하여 지금의 지형 형태를 나타내고 있으며 최근 을숙도 서편에는 대규모 수문 공사로 인한 해안선 변화가 생길 것으로 예상되지만 그에 대한 기초적인 자료 보전은 미비한 실정이다. 본 연구에서는 을숙도에 대한 지난 30년간(8개년도 구분)의 항공사진을 취득하여 정사영상으로 제작한 뒤, 수치도화 과정을 거쳐 해안선을 추출하였다. 추출된 벡터 자료는 DSAS(Digital Shoreline Analysis System) 4.2 프로그램을 통하여 SCE(Shoreline Change Envelope), NSM(Net Shoreline Movement), EPR(End Point Rate) 분석을 실시하였다. 그리고 2011년 10월에 VRS(Virtual Reference Station) 측량을 실시하여 을숙도 서편에 대한 기준선을 확보하고 이를 통하여 을숙도 수문 공사 전부터 지금까지의 변화를 비교 분석하였다. 수문 공사 전(2009)의 경우 연간 해안선 변화량이 약 -0.34m/yr이었으나, 공사 중(2011)에는 약 -0.50m/yr로 점차 퇴적양상을 나타내고 있었다.

• 한국수자원학회논문집
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• 제41권8호
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• pp.835-843
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• 2008

한국에서는 증가하는 용수수요에 대처하기 위해 1990년대부터 낙동강 유역의 지자체들에서 강변여과수를 활용하고 있다. 본 연구에서는 서울의 원수수질 안정을 위한 방안으로 강변여과 도입의 타당성을 검토하였다. 선행 논문에서 계층분석과정(AHP)에 의해 선택된 광나루지구에 대한 개발가능량 평가를 위해 지하수 모델링이 수행되었다. 광나루지구에서는 생태계보존지역 등을 고려하여 하천부지 약 1,200m 구간에 대해 관정시스템을 구축할 수 있을 것으로 파악되었다. 취수량을 늘리기 위한 방안으로 인공호수의 조성이 제안되었다. 80m 간격으로 16개의 관정을 설치할 경우 적정개발량은 연간 약 2,336만$m^3$으로 산정되었다.

• 실천공학교육논문지
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• 제12권1호
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• pp.177-186
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• 2020

본 연구는 국내 스마트제조 공급기업의 지속가능한 성장을 위해, 스마트제조 생태계 현황을 조망하고 스마트제조 공급기업의 지속가능한 인력양성 정책 수립의 객관적인 근거자료로 활용코자 함이 목적이다. 따라서 국내 스마트제조 공급기업 2,200여개사(社), 수요기업 6,000여개사(社)에 설문지를 구성, 배포하여 공급기업 259개사(社), 수요기업 155개사(社)에서 응답을 받았다. 연구 결과, 공급 및 수요기업 모두 종합적 전문성을 보유한 디지털 융합형 인력 및 현장 중심의 디지털 전환 전문 인력이 필요하다고 나타났으며. 양성방법에는 재직자 교육 및 사후관리 교육에 대한 수요가 높게 나타났다. 본 연구는 연구결과를 토대로 스마트제조 공급기업의 인력양성 정책적 제언을 제시함으로써 향후 한국의 스마트제조 공급산업의 글로벌 시장경쟁력을 강화하는데 기여할 것으로 사료된다.

• Ocean Science Journal
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• 제40권2호
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• pp.67-78
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• 2005

Complex physical, chemical and biological interactions off the Korean coast created several striking patterns in the phytoplankton blooms, which became conspicuous during the measurements of ocean color from space. This study concentrated on analyzing the spatial and temporal aspects of phytoplankton chlorophyll variability in these areas using an integrated dataset from a Sea-viewing Wide Field-of-view Sensor (SeaWiFS), Advanced Very High Resolution (AVHRR) sensor, and Conductivity Temperature Depth (CTD) sensor. The results showed that chlorophyll concentrations were elevated in coastal and open ocean regions, with strong summer and fall blooms, which appeared to spread out in most of the enclosed bays and neighboring waters due to certain oceanographic processes. The chlorophyll concentration was observed to range between 3 and $54\;mg\;m^{-3}$ inside Jin-hae Bay and adjacent coastal bays and 0.5 and $8\;mg\;m^{-3}$ in the southeast sea offshore waters, this gradual decrease towards oceanic waters suggested physical transports of phytoplankton blooms from the shallow shelves to slope waters through the influence of the Tsushima Warm Current (TWC) along the Tsushima Strait. Horizontal distribution of potential temperature $(\theta)$ and salinity (S) of water off the southeastern coast exhibited cold and low saline surface water $(\theta and warm and high saline subsurface water $({\theta}>12^{\circ}C; S>34.4)$ at 75dBar, corroborating TWC intrusion along the Tsushima Strait. An eastward branch of this current was called the East Korean Warm Current (EKWC), tracked with the help of CTD data and satellite-derived sea surface temperature, which often influenced the dynamics of mesoscale anticyclonic eddy fields off the Korean east coast during the summer season. The process of such mesoscale anticyclonic eddy features might have produced interior upwelling that could have shoaled and steepened the nutricline, enhancing phytoplankton population by advection or diffusion of nutrients in the vicinity of Ulleungdo in the East Sea.

• 한국물환경학회지
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• 제33권3호
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• pp.282-290
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• 2017

A long-term resuspension of small particles, called persistent turbidity, is one of the most important water quality concerns in the dam reservoirs system located in North Han River. Persistent turbidity may incur aesthetic nuisance and harmful effect on the ecosystem health, in addition to elevated water treatment costs for the drinking water supply to the Seoul metropolitan area. These sufferings have been more intensified as the strength and frequency of rainfall events increase by climate change in the basin. This study was to analyze the effect of an extreme turbidity flow event that occurred in 2006 on the serial reservoirs system (Soyang-Uiam-Cheongpyung-Paldang) in North Han River. The CE-QUAL-W2 model was set up and calibrated for the river and reservoirs system using the field data obtained in 2006 and 2007. The results showed that Soyang Reservoir released turbid water, which was classified as the TSS concentration is greater than 25 mg/L, for 334 days with peak TSS of 264.1 mg/L after the extreme flood event (592.7 mm) occurred between July 10 and 18 of 2006. The turbid water departed from Soyang Reservoir reached at the most downstream Paldang Reservoir after about 20 days and sustained for 41 days, which was validated with water treatment plant data. Since the released water from Soyang Reservoir had low water temperature and high TSS, an underflow formed in the downstream reservoirs and vertically mixed at Paldang Reservoir due to dilution by the sufficient inflow from South Han River.

• 한국유기농업학회지
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• 제6권1호
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• pp.133-149
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• 1997

Recently, the importance of management and cultivation of grasses has been increased in Korea. Among these cultural practices, the appropriate control of diseases is considered more important than other cultivation techniques such as fertilization and irrigation. The damages of brown patch and large patch caused by Rhizoctonia spp. and Pythium blight caused by Pythium spp. are serious in the major cultivation area of turfgrass in Korea. Since these diseases are difficult to control by agrochemicals, the damages are very serious if these are occured. The periodic spray of agrochemicals, to protect and control these diseases could make some problems of toxicity and environmental pollution as well as rising of non-target diseases. Therefore, the biological methods to control diseases have been required to decrease problems resulted from overuse of agrochemicals, to conserve natural ecosystem, and to control effectively diseases of grasses in the long period. The number of studies about biological control using antagonistic microorganisms have been increased for last half century. However, the application of biological control method has been very limited. In this study, thirteen isolates of R. cerealis, 8 isolates of R. solani and 3 isolates of Phthyn spp. have been isolated from diseased turfgrass in golf course and grass-culture area that have patch and wilting symptoms of zoysia grass and creeping bentgrass. Isolation frequency of R. cerealis and R. solani was high in especially zoysiagrass, while Pythym spp. was isolated from bent grass at low frequency but showed high pathogenicity. Totally, 205 isolates of soil microorganisms were isolated in this study as primary antagonistic microorganism by Herr's triple agar layer plate and dual culture method using rhizosphere of grasses, soil of crop field as the source of antagonistic microorganisms. Among the 205 isolates, 23 isolates were actinomycetes and 182 isolates were bacteria. All of the actinomycetes were isolated by Herr's method. Antagonistic effect of primary isolated microorganisms was tested for in vitro mycelial growth inhibition against pathogenic fungi isolated from grasses and for inhibition of disease occurrence in 24 well tissue culture plate and pot experiment. Then, four isolated of bacteria which are BG23, BG74, BG136 and BG171 were selected as antagonistic microorganisms against soil-born pathogenic fungi of bentgrass.

• 한국습지학회지
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• 제12권3호
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• pp.15-20
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• 2010

마산만유역의 창원시 수계에서 발생한 오염부하는 차집관로를 통하여 하수종말처리장으로 운반되거나 창원시 하천을 거쳐 봉암갯벌을 경유한 후 마산만으로 유입된다. 즉 마산만 하구 갯벌인 봉암갯벌은 도심에 위치하여 있고 민관산학의 협력으로 보존되어 생태학습장으로 이용되는 귀중한 갯벌이다. 특히 최근 몇 년 동안 조개류, 어류와 물새 등 다양한 생물이 관찰되고 있으며 우리나라 최초의 마산만특별관리해역 연안오염총량관리의 중심 지역에 해당한다. 1970년에 시작한 창원기계공업단지의 가동으로 마산만의 하구와 내만은 중금속으로 오염되었음이 보고되었다. 봉암갯벌의 저서생물의 서식지인 퇴적물에 존재하는 잔류성이 강한 주요 중금속 오염물질의 변화를 분석하였다. 아연, 구리, 납이 오염퇴적물 기준의 상위 기준 또는 심한 오염 기준을 초과하였고 인근 지점 별로도 95% 신뢰구간에서 차이를 보였다. 2006년과 2009년의 자료를 비교할 때 모든 중금속 농도가 점차 감소하고 있었다.

• 로봇학회논문지
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• 제8권1호
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• pp.51-57
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• 2013

Recently, the number of jellyfish has been rapidly grown because of the global warming, the increase of marine structures, pollution, and etc. The increased jellyfish is a threat to the marine ecosystem and induces a huge damage to fishery industries, seaside power plants, and beach industries. To overcome this problem, a manual jellyfish dissecting device and pump system for jellyfish removal have been developed by researchers. However, the systems need too many human operators and their benefit to cost is not so good. Thus, in this paper, the design, implementation, and experiments of autonomous jellyfish removal robot system, named JEROS, have been presented. The JEROS consists of an unmanned surface vehicle (USV), a device for jellyfish removal, an electrical control system, an autonomous navigation system, and a vision-based jellyfish detection system. The USV was designed as a twin hull-type ship, and a jellyfish removal device consists of a net for gathering jellyfish and a blades-equipped propeller for dissecting jellyfish. The autonomous navigation system starts by generating an efficient path for jellyfish removal when the location of jellyfish is received from a remote server or recognized by a vision system. The location of JEROS is estimated by IMU (Inertial Measurement Unit) and GPS, and jellyfish is eliminated while tracking the path. The performance of the vision-based jellyfish recognition, navigation, and jellyfish removal was demonstrated through field tests in the Masan and Jindong harbors in the southern coast of Korea.

• 한국환경복원기술학회지
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• 제21권3호
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• pp.27-45
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• 2018

Both the national land plan and the environmental plan reflect the need for sustainable land use and management. However, the linkage between the plans is reduced due to the lack of integrated management. Therefore, this study developed indicators to achieve integrated management. A total of 59 environmental plans were reviewed for the development of indicators, and a total of 74 integrated management indicators were derived through a three-stage process. In this process, the relevance of the integrated management indicators of this study to the UN 's sustainable development goals (SDGs) is presented in order to derive indicators that meet the level of international consultation. In order to facilitate the utilization of the indicators, the final indicators are divided into seven areas: natural ecology, water resource and quality, urban and green space, atmospheric, energy, landscape, resource circulation and waste. Furthermore, the indicators were classified into national, regional, and city level. Accordingly, the final indicator can be adapted to the field of influence of the planned to be established, and the indicator can be selected and applied to the level of the plan. The final indicators can be used to examine the extent to which the national plan reflects the contents of the environmental plan and can be used as an aid to confirm the contents to be included in the plan when establishing a new national plan.

• 융합보안논문지
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• 제20권3호
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• pp.47-52
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• 2020

방송 분야에서의 가상화 기술도입은 방송산업 생태계 전반에 걸쳐 IT 자원의 효과적인 운영을 기반으로 방송 서비스 자동화 및 지능화가 활발하게 진행되고 있다. 최근에는 방송망 인프라의 네트워크 가상화를 통해 다양한 방송 자원의 유연성을 높이고 다른 망과의 연동 효율성을 높이고자 하는 관심이 높아지고 있다. 방송망에서 IP 패러다임으로의 근본적인 변환은 인터넷 기반 서비스 플랫폼들과 5G 망과의 효과적인 연동과 신규 융합 서비스 개발을 위한 여러 가지 문제를 해결해야 하는 상황에 직면하고 있다. 즉, 이처럼 ATSC 3.0으로 대표되는 차세대 방송망과 5G 대표되는 이동통신망, 인터넷과의 유기적, 효과적인 연동을 위해서는 수많은 난제를 해결해야 하는 상황이다. 본 논문에서는 ATSC 3.0 방송망과 5G로 대표되는 이동통신망과의 융합을 위한 기본 기술 및 현황을 살펴보고, ATSC 3.0 방송망과 5G 망이 서로 망대 망으로 연동하려는 방안에 관해서 기술하였다.