• Proceedings of the Korea Contents Association Conference
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• 2013.05a
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• pp.413-414
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• 2013

본 연구는 C.P.N.T측면에서 싸이의 뮤직비디오 그리고 문화적인 요소의 성공요인들에 대해서 분석했다. 연구결과, 싸이의 뮤직비디오에는 재미, 유머, 음악과 춤의 반복성 등 창의적인 콘텐츠를 보여주었으며, 플랫폼으로는 YG의 유투브 직접 제작 참여로 수용자의 시청에 부담 없게 접근이 용이하게 고화질 저용량으로 보급하였습니다. 네트워크측면에서는 트위터와 페이스북과 같은 다양한 서비스를 통하여 빠른 속도와 장소에 구애받지 않고 유통망을 형성했으며, 매스미디어 NBC방송에 유투브 영상이 소개됨으로 싸이의 뮤직비디오와 음악이 단순한 UCC영상의 평범함에서 대중적이고 혁신적인 상징의 이미지로 급부상하게 된다. 또한 아이패드, 스마트폰, N스크린 등 많은 터미널을 통해 싸이의 강남스타일 뮤직비디오와 음악은 수용자의 시각과 청각을 만족시켜주어 성공하게 된다.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2006.04a
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• pp.255-258
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• 2006

인위적인 오염원이 존재하지 않는 농촌지역 지하수공에서 검출빈도가 매우 낮은 세레늄 성분에 대하여 양수조건에 따른 세레늄의 농도변화를 연구하였다. 양수에 따른 세레늄 농도변화의 연구는 현장지하수 수질이 지하수 먹는물 수질기준보다. 높은 2개의 지하수공에서 수행되었다. 본 연구를 통해, 세레늄 성분이 먹는물 수질기준을 초과한 지하수공의 지속적인 이용여부를 판단하였다. 또한, 양수시험공 주변의 세레늄 농도를 측정하여 배경농도를 파악하였으며, 시험공 내에서 구간별 채수를 수행하여 세레늄 성분이 산출되는 주대수층 구간을 파악하였다. 양수조건에 따른 세레늄의 농도변화를 연구하기 위한 방법은 하루 8시간을 기준으로 양수하는 단기적인 방법과, $4,950m^3$을 594시간 동안 장기양수하면서 농도변화를 측정하였다. 본 연구를 통해, 지하수 내 세레늄 성분의 농도변화는 장기양수에 의해 변화함을 알 수 있었다.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2011.04a
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• pp.508-511
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• 2011

현재 수질오염은 빈번히 발생하는 환경재해로 국민들의 생명과 안전을 위협하고 있다. 하지만 현재 실행되고 있는 수질오염 측정은 범위가 제한적이며 채수를 통한 수질 측정으로 측정이 오래 걸리며 수질 오염 발생 시 빠른 대처를 할 수 없는 어려움이 있었다. 그리하여 본 연구에서는 USN(Ubiquitous Sensor Network)기술과 부이(Buoy)를 융합한 USN관측부이를 이용 수중환경상태를 감지하여 실시간 정보를 수집하고 자료를 분석하여 위험상황(오염물질, 독성물질) 확인되는 즉시, 즉각적인 조치가 가능한 지능적인 유비쿼터스 지능형 수중환경 관리 시스템을 제시하고자 한다.

• Proceedings of the Korea Water Resources Association Conference
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• 2010.05a
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• pp.520-524
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• 2010

본 연구에서는 팔당호에 유입되는 북한강, 남한강, 경안천의 6개 지류에 대하여 2009년 6월부터 12월까지 10일 주기로 현장 측정한 10개의 수질평가 항목과 측정시기에 근접한 4장의 시계열 위성영상에 의한 수질분석 기법을 이용하여 RS/GIS에 의한 수질환경 모니터링을 실시하였다. 현장에서는 다항목 수질측정기(DS5, Hydrolab ; 센서장착포트 7개, 측정항목 : 수온, 탁도, EC, LDO)를 이용하였고, 채수를 통해 실내에서 T-N, T-P, BOD, COD, ph, 부유물질(이하, SS)을 측정하였다. 위성영상에 의한 수질인자는 수온, 탁도, SS 등을 선정하여 자료의 정성적 해석을 통해 팔당호의 수질환경 모니터링을 수행하였다. 또한, 위성영상으로 분석한 수질평가 자료는 현장자료와의 상관성을 검토하였으며 회귀분석을 실시하여 수질인자별 분포도를 작성하였다.

• Journal of Korean Society of Forest Science
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• v.96 no.1
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• pp.21-28
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• 2007

This study was conducted to investigate how the qualities of the stream water vary during the event in the regrowth and rehabilitation catchments in Yangju, Gyeonggido, from June to September 2005. During the observation periods, we sampled the stream water continuously by an auto-sampler (ISCO, 6712FR). The sampled waters were analyzed for suspended solid concentration, electrical conductivity and pH. The suspended solid concentration during the event increased concurrently with the stream flow. The peak of suspended solid concentration usually precedes the peak flow. The maximum value of suspended solid concentration was 420.89 mg/l in the event 1 at the regrowth catchment. Among the events simultaneously sampled at both catchments, the maximum values of suspended solid concentration were 212.8 mg/l and 58.24 mg/l in the event 3 at the regrowth and rehabilitation catchment respectively. The maximum value of EC in each event showed in the early stage of rising limb. EC decreased during the rising limb, and then showed minimum value at peak flow. EC gradually increased to pre-event value after minimum one. pH varied in similar pattern with EC. The maximum value of suspended solid concentration during each event was 2.8 to 4.3 times higher at the regrowth catchment than at the rehabilitation catchment. And the EC during each event was higher at the regrowth catchment than at the rehabilitation catchment. This results indicate that a disturbed forest soil during clear cutting at regrowth catchment still has been unstable.

• Journal of Wetlands Research
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• v.21 no.2
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• pp.140-146
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• 2019

In order to manage non-point sources, the paradigm of the system should be changed so that the management of non-point sources will be systematized from the beginning of the use and development of the land. It is necessary to change the method of national subsidy support and poeration plan for the non-point source management area. In order to increase the effectiveness of the non-point source reduction project, it is necessary to provide a minimum support ratio and to provide additional support according to the performance of the local government. A new system should be established to evaluate the performance of non-point source reduction projects and to monitor the operational effectiveness. It is necessary to establish the related rules that can lead the local government to take responsible administration so that the local governments faithfully carry out the non-point source reduction project and achieve the planned achievement and become the sustainable maintenance. Alternative solutions are needed, such as problems with the use of $100{\mu}m$ filter in automatic sampling and analysis, timely acquisition of water sampling and analysis during rainfall, and effective management of non-point sources network operation management. As an alternative, it is necessary to consider improving the performance of sampling and analysis equipment, and operate the base station. In addition, countermeasures are needed if the amount of pollutant reduction according to the non-point source reduction facility promoted by the national subsidy is required to be used as the development load of the TMDLs. As an alternative, it is possible to consider supporting incentive type of part of the maintenance cost of the non-point source reduction facility depending on the amount of pollutants reduction.

• Journal of the Korean Association of Geographic Information Studies
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• v.25 no.1
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• pp.101-119
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• 2022

Existing algal bloom monitoring is based on field sampling, and there is a limit to understanding the spatial distribution of algal blooms, such as the occurrence and spread of algae, due to local investigations. In this study, algal bloom monitoring was performed using an unmanned aerial vehicle and multispectral sensor, and data on the distribution of algae were provided. For the algal bloom monitoring site, data were acquired from the Mulgeum·Mae-ri site located in the lower part of the Nakdong River, which is the areas with frequent algal bloom. The Chlorophyll-a(Chl-a) value of field-collected samples and the Chl-a estimation formula derived from the correlation between the spectral indices were comparatively analyzed. As a result, among the spectral indices, Maximum Chlorophyll Index (MCI) showed the highest statistical significance(R²=0.91, RMSE=8.1mg/m³). As a result of mapping the distribution of algae by applying MCI to the image of August 05, 2021 with the highest Chl-a concentration, the river area was 1.7km², the Warning area among the indicators of the algal bloom warning system was 1.03km²(60.56%) and the Algal Bloom area occupied 0.67km²(39.43%). In addition, as a result of calculating the number of occurrence days in the area corresponding to the "Warning" in the images during the study period (July 01, 2021~November 01, 2021), the Chl-a concentration above the "Warning" level was observed in the entire river section from 12 to 19 times. The algal bloom monitoring method proposed in this study can supplement the limitations of the existing algal bloom warning system and can be used to provide information on a point-by-point basis as well as information on a spatial range of the algal bloom warning area.

• Korean Journal of Ecology and Environment
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• v.37 no.1 s.106
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• pp.47-56
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• 2004

To understand the effect of nutrient deficiency on the plankton community in three stations with different water qualities in Pal'tang Reservoir, Korea, phytoplanktons(> 10 ${\mu}m$) were cultured in nutrient enrichment Allen's media (AM) and nutrient-deficient Allen's media. A distinct shift in the species composition and biomass of phytoplankton (as chlorophyll- a) showed in all treatments. In particular, it was very interesting that the new development of cyanobacterium Microcystis aeruginosa occurred by the Fe-deficient AM. Except for Si, a community growth (as chlorophyll- a) was inhibited in all nutrient deficient treatments. Species diversity after nutrient deficiency was changed to below 2.0; slightly increased in N and P-deficiency, while decreased in Si and Fe, respectively. As suggested, dominance was entirely opposite to diversity. Therefore, the nutrient deficient effectively induced the succession of species and biomass, phytoplankton community, suggesting a possibility as a reliable tool to control the algal bloom in eutrophic lakes and reservoirs.

• Korean Journal of Environmental Agriculture
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• v.38 no.4
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• pp.338-351
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• 2019

BACKGROUND: To investigate distribution and seasonal variation of concentration and flux of pesticides in Han river basin, water samples were examined at 24 sites in 2012 and 2014. METHODS AND RESULTS: Water samples were collected four times per year and subjected to liquid-liquid partition extraction followed by GC-ECD/NPD analysis. Of fifteen pesticides detected, iprobenfos, diazinon, isoprothiolane, endosulfan sulfate and oxadiazon were detected in a higher frequency, while fenoxanil, carbofuran, fenitrothion, butachlor and metolachlor were only detected in a sample. Pesticides with high occurrences, iprobenfos, diazinon, isoprothiolane, endosulfan sulfate and oxadiazon were detected in residue level of 0.01-0.46, 0.01-0.24, 0.03-0.85, 0.02-0.06 and 0.05-0.24 ㎍/L, respectively. Carbofuran and acetanilide herbicides were found at lower frequencies, but their concentrations were one order of magnitude higher than those of the others. CONCLUSION: Discharge of pesticides in downstream area were mainly contributed from rice farming and suburban horticulture, while pesticide occurrences in upstream area, such as Donggang river basin were caused by highland agriculture for cabbage and potato production. Despite the influx of pesticides from tributaries through intensive agriculture areas, pesticide concentration in the main stream water was low due to the dilution effect from the upstream. Therefore, the water quality was considered to be good at the most downstream, the effluent of Paldang dam.

• Korean Journal of Microbiology
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• v.31 no.2
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• pp.105-112
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• 1993

Plesiomonas shigelloides distributed in the aquatic systems was isolated and identified in this study and compared with the c1inica] isolates in view of their physiological characteristics, Biochemica] charactristics of the isolates of P. shigelloides one sample taken from Gupo and two samples taken from Mu]gum, were studied. However, none was isolated in Haeundae, Dadaepo, Kangdong and Nakdong estuary. The isolated bacteria had an optimum growth condition in peptone water of $25~35^{\circ}C$, pH 7.5-8.0 and 1% NaCI concentration. The cell grew most properly on the selective enrichment media which were made from adding inositol to peptone water. DNase was s]owly produced and the results were different from those of other studies. The components of the fatty acid were 3% of 3-hydroxy]ated fatty acid containing $C_{12}~C_{18}$. 0-10% cyclopropane ($C_{17:0}$), 25~30% hexadecanoic acid ($C_{16:0}$), 32~43% hexadecenoic acid ($C_{16:1}$), 1~2% octadecanoic acid ($C_{16:0}$), and 9~14% octadecenoic acid ($C_{18:1}$). Bacterio]ogica] characteristics, susceptibility of antibiotics, and the components of fatty acid of the c1inica] isolates were similar to those of the strains isolated from the aquatic systems. The strains isolated from c1inica] sources degraded lactose more fast than those isolated from the aquatic systems. There existed resistant bacteria to chlorampenicol in the strains from patients, but there were no resistant bacteria in the strains from the aquatic systems. The components of fatty acid of the clinical isolates were 0~2% $C_{17:0 cyclo}$ and 2~3% $C_{18:0}$, but those of the strains from the aquatic systems were 2~10% and 1~2%, respectvely, which showed the quantitative difference between both components.