위성 위치 추적 부이를 활용한 낙동강 하류 부유쓰레기의 하구 유출 특성 분석

장선웅,윤홍주,서원찬,Jang, Seon-Woong,Yoon, Hong-Joo,Seo, Won-Chan 한국전자통신학회 2015 한국전자통신학회 논문지 Vol.10 No.2

본 논문은 낙동강 하류 지역 부유쓰레기에 대한 실시간 이동 경로 추적과 수문기상환경 분석을 통해 구체적인 하구 유출 특성을 파악하고자 하였다. 부유쓰레기의 이동 및 하구 유출 경로를 파악하기 위해 위성 위치발신기를 장착한 소형 부이를 활용하였다. 그리고 수문기상환경을 파악하기 위해 하천 유량 및 하구둑 방류량변화, 하구역의 풍향에 대한 분석을 수행하였다. 향후 본 연구 결과는 집중호우시 낙동강 부유쓰레기의 연안유출 여부와 피해 범위를 파악하는데 기초 자료로 활용할 수 있을 것으로 기대된다. The present study is to identify discharge characteristic from the mouth of floating debris in the Nakdong River through real time tracking of moving route and by analyzing hydrometeorologic environmental. To identify the path and route of outflow through the mouth of the river of floating debris, small-sized buoy equipped with satellite location transmitters was used. Moreover, to identify hydrometeorologic environmental, flux of the river, change of discharge of the River-Mouth Weir and wind direction of the mouth of the river area were analyzed. From now on, the present study is expected to be utilized as basic data to identify damage and flowing into nearby ocean of the floating debris of Nakdong River in time of severe rain storm.

해안표착물의 효율적인 모니터링을 위한 무선 조정 항공기 촬영기법의 적용

장선웅,이성규,오승열,김대현,윤홍주,Jang, Seon-Woong,Lee, Seong-Kyu,Oh, Seung-Yeol,Kim, Dae-Hyun,Yoon, Hong-Joo 해양환경안전학회 2011 해양환경안전학회지 Vol.17 No.4

본 연구는 무인 항공사진 촬영을 이용하여 해안에 산재한 해안표착물을 탐지하는 새로운 방법을 제시하였다. 이동성과 신속성, 경제성이 우수한 소형 무선 조정 헬리콥터의 기체와 헬리콥터의 진동에 관계없이 연직 상태를 유지할 수 있는 짐벌 장치에 디지털카메라를 장착하여 항공사진 촬영을 시행하였다. 또한, 촬영된 영상으로부터 해안표착물을 탐지하기 위해 Matlab program을 이용한 디지털 영상처리 알고리즘을 고안하였다. 특히 고안된 알고리즘은 배경 차감 기법(Background subtraction method)을 적용하여 연구 대상 해안의 각기 다른 모래 상태로 인해 발생하는 물체 추출 오차를 감소시킴으로써 다양한 형태의 해안표착물을 안정적으로 탐지하는 결과를 보여주었다. 향후, 이 연구 방법을 적용한 해안표착물 모니터링이 이루어질 경우 모니터링 대상 구역 설정의 대표성 문제 해결 및 발생량 추정에 크게 기여할 수 있으며, 해양환경 감시 분야에 활용가능성이 클 것으로 판단된다. This study proposed detection method of Marine debris using unmanned aerial photography. For unmanned aerial photography, a RC(Radio Control) helicopter which has good movability and economics was used. To a camera mounting, a gimbal equipment was attached to the bottom of the RC helicopter. The gimbal equipment is very useful because it is not seriously affected by vibration and rolling. In addition, we invented that digital image processing algorithm using Matlab program for detection of marine debris from photographs. Particularly, background subtraction in invented algorithm was applied. As a result, marine debris of a variety of forms from different sand states of coast were reliably detected. In the future, monitoring using proposed method was expected to contribute that the solution to representative problem of monitoring area selecting and estimate the total litter mass over the beach. Moreover, It is considered a greater application possibility to marine environmental observations.

영상 정보에서의 해안쓰레기 추출을 위한 소프트웨어 구현

장선웅(Seon-Woong Jang),이성규(Seong-Kyu Lee),오승열(Seung-Yeol Oh),윤홍주(Hong-Joo Yoon),정용현(Yong-Hyun Chung),성기택(Ki-Taek Seong) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5

3분 탈진운동 검사 시 파워 프로파일의 초기 하위 항정상태를 이용한 임계파워 측정

장선웅 ( Seon Woong Jang ),김동희 ( Dong Hee Kim ) 한국운동생리학회 2015 운동과학 Vol.24 No.3

PURPOSE: Methods of determination of critical power (CP) typically consisted of several repeated all-out tests in multiple sessions. Much progress has recently been made in studies, including the 3-min all-out test (3MT), which tried to reduce the number of sessions and testing time. There is, however, lack of the development of new methods minimizing the decrease in accuracy and reliability with maximal temporal efficiency. Thus, the current study was conducted to suggest a new method of determining CP that achieves a reduction in the number of sessions and testing time and guarantees high accuracy and reliability using a modified 3MT protocol and a characteristic of power profile, named the first low steady state (FLSS). METHODS: Ten men (23.8±4.0 years, 175.30±4.85 cm, 75.90±10.55 kg) with no cardiorespiratory, metabolic diseases and medical history of those completed a prior incremental exercise test on a cycle ergometer, followed by 20-min recovery. And then they completed 3MT. After CP was determined by the established 3MT (CPL30s) and by the new method (CPFLLS), CPL30s-CPFLLS mean comparison using paired t-test, correlation analysis and agreement analysis using Bland-Altman plot were conducted with the significant level α=.05. Time gain of the new method was also evaluated and reliability analysis using standard error of estimates (SEE), typical error (TE), coefficient of variation (CV) was conducted. RESULTS: The non-significant mean difference between CPL30s and CPFLLS (p=.477), high time gain (60.6±27.2 sec), high correlation (R2=.98), low errors (SEE=4.5 W, TE=3.0 W), low CV (1.8%), and good agreement were found. In other words, the proposed method not only maintained or improved accuracy also enhanced temporal efficiency, compared to the established modified 3MT. CONCLUSIONS: In conclusion, the proposed method is considered to be a way to determine CP with a reduction in the 3-min testing time of mandatory supramaximal exercise containing potential danger and enable people limited to conduct a physically demanding CP test to do.

낙동강 유역 부유쓰레기의 집적 구간 탐색 및 성상 조사 연구

장선웅 ( Seon Woong Jang ),김대현 ( Dae Hyun Kim ),정용현 ( Yong Hyun Chung ),윤홍주 ( Hong Joo Yoon ) 한국지리정보학회 2015 한국지리정보학회지 Vol.18 No.2

본 연구는 낙동강 부유쓰레기에 대한 실태 조사와 이동 경로 추적 시험을 통해 주요 집적 구간을 파악하고자 하였다. 또한, 주요 집적 구간을 대상으로 표본 조사를 실시하여 부유쓰레기의 유입량 및 성상을 파악하였다. 그 결과 낙동강 중·하류 지역으로부터 총 5곳의 집적 구간이 선정되었으며 대량의 초목류와 생활쓰레기가 집적되어 있었다. 그리고 하류 지역에 위치한 2곳의 집적 구간에서는 부유쓰레기가 해양으로 유출될 가능성이 큰 것으로 예측되었다. 주요 집적 구간에 대한 표본 조사에서는 초목류와 생활쓰레기를 포함한 40ℓ이상의 쓰레기가 수거되었다. 생활쓰레기의 성상을 분류한 결과 플라스틱류가 49%를 차지하였으며 스티로폼류가 36%로 대부분을 차지하였다. 향후 본 연구는 낙동강 부유쓰레기의 해양 유입을 줄이고 효율적인 사전 수거 활동을 계획하는데 도움을 줄 것으로 기대된다. The aim of this study is to find out major accumulation zones through field survey and moving route tracking trials on floating debris of Nakdong River. It also identified composition and accumulated amount of the floating debris by sample survey for accumulation zones. As a result, total 5 accumulation zones were selected from the midstream and downstream of the Nakdong River. There was a large amount of floating debris, including vegetation debris, in the accumulation zones. And two accumulation zones located in the downstream region, it is much more likely to flow into the ocean along river. From the sample survey on the major accumulation zones, more than 40ℓ of floating debris were collected including vegetation and artificial debris. As a result of composition analysis for artificial debris, plastic(49%) and styrofoam(36%) were the majority in number. The present study is expected to help to plan an efficient pre-collecting activity and to reduce floating debris flowing into the ocean from the Nakdong River.

낙동강 유출 부유쓰레기의 거동 특성

장선웅 ( Seon Woong Jang ),김대현 ( Dae Hyun Kim ),정용현 ( Yong Hyun Chung ),윤홍주 ( Hong Joo Yoon ) 대한원격탐사학회 2014 大韓遠隔探査學會誌 Vol.30 No.1

낙동강은 하구의 수문 개방 시 연간 수천 톤의 쓰레기가 남해로 유입되어 인근 연안을 이동하며 사회·경제적 피해를 유발하고 있다. 이에 본 연구에서 낙동강 유출 부유쓰레기의 거동 특성을 파악하기 위해 2012년 장마, 태풍 내습 시를 대상으로 피해지로 추정되는 거제도 북동측 해안 1개소에 대한 조사와 부이를 활용한 이동 경로 추적 시험을 수행하였다. 또한, 해양기상 환경에 대한 분석을 통해 부유쓰레기의 이동과 관련된 흐름을 파악하였다. 연구 결과 장마 시기인 7월 16일 초목류를 비롯한 총 40톤 정도의 쓰레기가 흥남해수욕장으로 유입되었다. 또한 9월 14일 태풍 ‘산바’ 내습 시기에 투하된 위치 추적 부이는 가덕도 남쪽 해상을 지나 1 ∼ 2일 후 거제도 해안가로 유입되는 결과를 보여주었다. 부유쓰레기와 위치 추적 부이가 거제도 북동측 해안가로 유입될 당시 거제 해역에서 북동풍계열의 풍향이 지배적이었으며 연안으로 유입되는 공통적인 해수 표층 흐름이 나타났다. When the mouth of the Nakdong River, opens its floodgate, thousands of tons of litter should flown into the South Sea, moving towards nearby coast, thus causing serious social and economic damage. For this reason, in the present study, research was performed on one certain area in northeast coast of Geoje island, which is assumed as area damaged due to rainy season and typhoon in 2012, and research for trace of movement route was implemented by using buoy to identify characteristic of movement of floating debris caused from Nakdong River. Flows related to the movement of floating debris was also identified by analyzing ocean meteorological environment. As a result of the study, total 40 tons of litter composed of grasses and trees(or plants litter) were flown into Heungnam beach on 16th, Jul which is the rainy season. Plus, the location tracking buoy, which was dropped when the typhoon SANBA was coming, was passed by southern sea of Gadeok-do and was flown into Geoje beach 1 ~ 2 days after it was dropped. The wind direction was mostly northeasterly wind around the Geoje beach at the time the buoy and floating debris were flown into northeast coast and there was common sea surface currents which was flowing into the coast.

유효강우량과 유량에 따른 하천 부유쓰레기 이동량 산출

장선웅(Seon Woong Jang),윤홍주(Hong Joo Yoon) 한국전자통신학회 2017 한국전자통신학회 논문지 Vol.12 No.1

장마나 집중호우 등에 의한 지속적인 강우는 비점오염원의 유출과 더불어 유량을 증가시킨다. 그리고 유량의 증가로 수위가 상승하게 되면 하천 주변에 산재되어 있던 부유쓰레기는 빨라진 유속에 의해 이동하게 된다. 하지만 현재 국내외에서 강우량과 유량을 분석하여 부유쓰레기의 이동량을 정량적으로 산출한 연구 사례는 없었다. 이에 본 연구에서는 SCS-CN 방법을 이용하여 산출한 유효 강우량과 유량 변화에 따른 이동 경로 모니터링 결과를 토대로 부유쓰레기의 이동량을 산정하였다. Along with effluence of non-point pollution source, continuous precipitation due to rainy season or localized heavy rain can also be a good reason for increase of flow rate. And if the water level is going up due to the increase, floating debris around rivers and streams will move because of increased flow velocity. However, currently, there are no studies which perform quantitative calculation on movement of floating debris by analyzing amount of rainfall and flow rate in both domestic and abroad. Thus, the present study calculated amount of movement of floating debris based on moving route monitoring results according to changes of effective rainfall and flow rate that are obtained by using SCS-CN method.

서해안 일대 외국기인 해양쓰레기의 유입과 계절적 특성 연구

장선웅(Seon Woong Jang),박재문(Jae Moon Park),정용현(Yong Hyun Chung),김대현(Dae Hyun Kim),윤홍주(Hong Joo Yoon) 한국해양환경·에너지학회 2012 한국해양환경·에너지학회지 Vol.15 No.2

원격탐사 기법 적용을 통한 대청호 상류 유입 부유쓰레기 조사 및 현존량 추정 연구

김영민,장선웅,김흥민,김탁영,박수호,Youngmin Kim,Seon Woong Jang,Heung-Min Kim,Tak-Young Kim,Suho Bak 대한원격탐사학회 2023 大韓遠隔探査學會誌 Vol.39 No.5

Floating debris in large quantities from land during heavy rainfall has adverse social, economic, and environmental impacts, but the monitoring system for the concentration area and amount is insufficient. In this study, we proposed an efficient monitoring method for floating debris entering the river during heavy rainfall in Daecheong Lake, the largest water supply source in the central region, and applied remote sensing techniques to estimate the standing-stock of floating debris. To investigate the status of floating debris in the upper of Daecheong Lake, we used a tracking buoy equipped with a low-orbit satellite communication terminal to identify the movement route and behavior characteristics, and used a drone to estimate the potential concentration area and standing-stock of floating debris. The location tracking buoys moved rapidly during the period when the cumulative rainfall for 3 days increased by more than 200 to 300 mm. In the case of Hotan Bridge, which showed the longest distance, it moved about 72.8 km for one day, and the maximum moving speed at this time was 5.71 km/h. As a result of calculating the standing-stock of floating debris using a drone after heavy rainfall, it was found to be 658.8 to 9,165.4 tons, with the largest amount occurring in the Seokhori area. In this study, we were able to identify the main concentrations of floating debris by using location-tracking buoys and drones. It is believed that remote sensing-based monitoring methods, which are more mobile and quicker than traditional monitoring methods, can contribute to reducing the cost of collecting and processing large amounts of floating debris that flows in during heavy rain periods in the future.

GIS을 활용한 낙동강 하구 해안의 일회용라이터 모니터링을 통한 발생지 추정

김영민,장선웅,윤홍주,Kim, Young-Min,Jang, Seon-Woong,Yoon, Hong-Joo 한국전자통신학회 2015 한국전자통신학회 논문지 Vol.10 No.6

본 연구는 표면에 사업자명과 전화번호가 인쇄되어 있는 일회용라이터를 수집하여 기원지를 추정하였다. 낙동강 하구 사주 해안 2곳(진우도, 신자도)과 거제도 해안 3곳(두모몽돌해수욕장, 흥남해수욕장, 여차몽돌해해수욕장)을 2012년 2월부터 2013년 12월까지 격월로 모니터링을 시행한 결과, 총 166개의 라이터를 수집하였다. 시기적으로 6월, 8월에 가장 많은 발생률을 보였으며, 연구지역에 유입된 일회용라이터의 기원지는 대부분 인구밀도가 높은 낙동강 유역 지역 및 연안지역이었다. In this study, It was analyzed to estimate the origin from the collected disposable lighters with the printed company name and telephone number on the surface. Monitoring was done bimonthly from 2 areas of sandbar Coastline of Nakdong River Estuary(Jinu-do, Shinja-do) and 3 areas(Doomo beach, Heungnam beach, Yeocha beach) of Northeastern coast of Geoje-do. As a result of the monitoring, there were 166 lighters collected. Then, the monthly occurrence amount was concentrated in Jun, August. The origin of Disposable lighters that flowed in study area were mostly cause to the Nakdong River basin region and the coastal area where population densities are high.