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류성훈,이인철,김경회,윤한삼,Ryu, Sung-Hoon,Lee, In-Cheol,Kim, Kyung-Hoi,Yoon, Han-Sam 해양환경안전학회 2014 해양환경안전학회지 Vol.20 No.6
본 연구에서는 갯벌토 및 준설토를 기질로 이용한 Mesocosm 실험을 통하여 염생식물의 서식안정성을 평가하였다. Mesocosm 실험구는 기질 및 식생의 식재 여부에 따라 Mesocosm A(갯벌토+퉁퉁마디 식재), Mesocosm B(준설토), Mesocosm C(준설토+퉁퉁마디 식재)로 조성하였다. 그리고 Mesocosm 실험구 내 염생식물의 서식안정성을 평가하기 위해 수질(COD, T-N, T-P, 수온, 염분), 저질(COD, T-N, T-P), 식생성장률의 서식환경 인자에 대한 모니터링을 실시하여 서식안정성지수(HSI)를 산정하였다. Mesocosm C에서의 HSI는 0.87~0.95로서 Mesocosm A에 비하여 상대적으로 HSI가 높게 산정되어, 준설토를 이용한 해안염습지의 복원/조성에 이용될 수 있을 것으로 평가되었다. In this paper, it was constructed the halophyte Mesocosm experimental which was used tidal flat and dredged sediment as a substrate material. Depending on the vegetation and substrate material of Mesocosm, Mesocosm A(tidal flat sediment + Salicornia herbacea), Mesocosm B (only dredged sediment), Mesocosm C(dredged sediment + Salicornia herbacea). Monitoring was carried out of Warter quality factots(Chemical Oxygen Demand(COD), Total Nitrogen(T-N), Total Phosphorus(T-P), water temperature, salinity), Sediment factors(Chemical Oxygen Demand(COD), Total Nitrogen(T-N), Total Phosphorus(T-P)) and growth of Salricornia herbacea. Habitat Stability Index of vegetation was calculating by using the monitoring results. HSI of Mesocosm C was calculated from 0.87 to 0.95 as compared to the relatively high HSI in Mesocosm A, it was evaluated to be able to be used in the restoration and construction of the coastal salt marsh with dredged sediment.
다이아프램 두께 변화에 따른 하이브리드 로켓의 후퇴율 향상에 관한 연구
류성훈,오지성,문근환,김학철,문희장,김진곤,Ryu, Sung-Hoon,Oh, Ji-Sung,Moon, Keun-Hwan,Kim, Hak-Chul,Moon, Hee-Jang,Kim, Jin-Kon 한국항공운항학회 2015 한국항공운항학회지 Vol.23 No.4
In this work, a study was conducted to investigate the effect of diaphragm thickness on the regression rate of the hybrid rocket motor. To observe the flow pattern and the recirculation zone, visualizations of combustion chambers with different diaphragm thickness (5mm, 10mm) were performed. It was found that the case with 5 mm thickness had a larger recirculation zone and therefore, had a higher regression rate than the case with 10mm thickness due to the increased residence time and heat transfer toward the fuel surface. Finally, it was concluded that the thickness of diaphragm can be a critical parameter for the enhancement of the regression rate.
류성훈,김경회,이인철,Ryu, Sung-Hoon,Kim, Kyung-Hoi,Lee, In-Cheol 해양환경안전학회 2011 海洋環境安全學會誌 Vol.17 No.3
본 연구는 낙동강 하구역의 사주지형 변화를 예측하기 위한 기초적 연구로서 하천유량의 변화에 따른 부유사의 물질수지에 대하여 검토하였다. 낙동강 하구역의 부유사 물질수지는 갈수기시 60,708 kg/day가 유입하고, 홍수기는 306,892 kg/day가 외해를 통하여 유출하는 것으로 산정되었다. 낙동강 하구역은 전반적으로 갈수기 및 평수기에 부유사의 유입, 홍수기에 부유사의 유출이 반복 되지만, 사주지형 주변에서는 부유사의 유입과 유출 거동이 복잡하게 나타나 장기 지형변동 모니터링이 필요한 것으로 나타났다. To predict the deposition characteristic in the Nakdong river estuary, the material budget of Suspended Solid(SS) was investigated with the amount of Nakdong river discharge being set as dry season and flood season. The results of material budged of SS in dry season and flood season were 60,708 kg/day(inflow) and 306,892 kg/day(outflow), respectively.
류성훈,김경회,이인철,Ryu, Sung-Hoon,Kim, Kyung-Hoi,Lee, In-Cheol 해양환경안전학회 2016 海洋環境安全學會誌 Vol.22 No.2
본 연구에서는 하구 염습지 생태계 복원 및 조성을 위한 기초적 연구로서, 낙동강 하구 사주섬인 진우도에 서식하는 갈대의 서식환경 특성을 파악하기 위하여 저질의 함수량, 입도분포, pH, 영양염 농도($NH_4-N$, $PO_4-P$), 지하수위, 지반고, 갈대 개체수 및 최대 높이 등의 조사를 실시하였다. 조사결과 연구대상 지역의 저질 입경 및 함수량이 갈대 서식환경에 미치는 영향은 적은 것으로 나타났으며, pH는 식생대와 비식생대 정점의 차이가 없었고, $NH_4-N$와 $PO_4-P$ 농도도 정점별 차이가 없었다. 식생대 영역에서 해안선 쪽으로 갈수록 지반고가 낮으며 개체수는 감소하였고, 지하수위는 높게 나타났다. 따라서 낙동강 하구 염습지의 갈대서식 환경에 영향을 미치는 주요인자는 지반고와 지하수위가 크게 기여하는 것으로 나타났다. In this paper, as a basic research for the restoration and construction of easuary saltmarsh, To observe the habitat environment for reed, we observed sediment environment (Particle size, water content, pH, nutrient analysis ($NH_4-N$, $PO_4-P$)), ground water level, ground level, individual numbers of reed, maximum reed height. As a result of this study, sediment particle size and moisture content of soil on the study area not effected reed habitat, pH showed no difference in each site. $NH_4-N$ and $PO_4-P$ concentration also no difference in each site. Ground level of reed habitat area is more higher than none reed habitat. However Ground water level of reed habitat area is more lower than none reed habitat. As a results of analyzing the influence factors for reed habitat in Nakdong estuary saltmarsh, ground water level and ground level is most influenced factor for reed habitat.
류성훈(Sung-Hoon RYU),이인철(In-Cheol LEE),진승환(Seung-Hwan JIN) 한국수산해양교육학회 2018 水産海洋敎育硏究 Vol.30 No.4
For the analyzing of annual variation of water quality and fisheries production in Jinhae bay, Korea, we divided three regions and then analyzed water quality and fisheries production of Jinhae bay during 2004 to 2016. Water quality is analyzed by using Water Quality Index(WQI) which is calculating by using Surface; chlorophyll-a, Dissolved Inorganic Nitrogen(DIN), Dissolved Inorganic Phosphorus(DIN), Transparency of seawater, Bottom; Dissolved Saturation(DO). Fisheries production is analyzed by using total fisheries production in Jinhae bay. As a result of this study, WQI of Region Ⅰ was gradually improved 5th grade(2004) to 1st grade(2016) but fisheries production was decreased by 49.2%. Region Ⅱ of WQI was decreased from 2014 and fisheries production was not significant variation. Region Ⅲ of WQI was decreased 1st grade(2005) to 4th grade(2014) but fisheries production was increased by 62.5%.
낙동강 하구역 진우도내 지형변동에 따른 식생면적의 변화
류성훈(Sung-Hoon Ryu),이인철(In-Cheol Lee),박소영(So-Young Park) 한국해양공학회 2009 韓國海洋工學會誌 Vol.23 No.4
In order to analysis the variation in vegetation area caused by topographical change at Jinudo in the Nakdong estuary, we used aerial photographs of Jinudo from 1998 to 2006. To extract an accuracy shoreline from these aerial photographs, a tide calibration was performed. We also estimated the annual variation in topographic area and vegetation area, and then analyzed the relationship between them by a correlation analysis. The following results were obtained: 1) The calibrated shoreline distance of Jinudo from 1998 to 2006 was estimated to have a range of (-)1,927 ㎝ to (+)4,671 ㎝. 2) Annual Changes in the topographic area and vegetation area in Jinudo have been increasing gradually from 1998, and the correlation coefficient between topographic area and vegetation area is 0.97. 3) The estimated topographic areas were with following order: southern (Ⅲ), eastern (Ⅳ), northern (Ⅱ) and western (Ⅰ), while for the vegetation area, the order was southern (Ⅲ), northern (Ⅱ), eastern (Ⅳ) and uesiem (Ⅰ). 4) The vegetation area of the southern region (Ⅲ) of Jinudo had the largest size among the regions, and was calculated to be 4.3~5.4 times larger than the eastern region (Ⅳ).