• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.206-207
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• 2000

해저퇴적물은 수생생물들의 주거공간을 제공하여 수생생태계에서 중요한 역할을 담당한다. 그러나 오염된 해저퇴적물은 수계에서 축적되는 양보다 퇴적물에서 수계로 용출되는 양이 많아 수계의 오염을 가중시키는 가장 끈 원인이 된다. 오염도가 높은 퇴적물에서는 특정종의 서식을 불가능하게 하거나 서식이 가능하다 할지라도 서식생물의 체내에 오염물이 농축되어 이는 먹이사슬을 통하여 수중서식생물들에게 축적되게 되어 궁극적으로 인간들에게도 나쁜 영향을 미치게 된다. (중략)

• Explosives and Blasting
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• v.28 no.2
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• pp.86-98
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• 2010

As the quality of life is being upgraded, the public complaints about noise and vibration from construction sites are growing. Despite the disputes over the blasting damage on aquatic lives in river, ocean, and aquarium near construction sites tend to increase, most of existing solutions or regulations on the damages caused by blasting are established for the damages on land. Although the estimated amount of damage is up to several millions of USD, there is no guideline for resolving the dispute related to the underwater vibration. This paper presents an example where the public grievance about the underwater noise was successfully resolved by elucidating the characteristics of underwater sound, deducing the correlations between ground vibration and underwater sound during blast, and predicting the underwater sound level during blasting from the ground vibration measured on the ground near an aquarium basin.

• Journal of the Korean Society of Marine Environment & Safety
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• v.28 no.6
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• pp.1078-1085
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• 2022

Fouling organisms attached to a ship not only greatly increase the resistance of the ship as they grow on the hull but also cause disturbances in local marine ecosystems as they move with the ship. Accordingly, the International Maritime Organization has started discussing the removal of biofouling and evaluation of cleaning performance to prevent the migration of hull-fouling species. In this study, specimens of FRP(Fiber Reinforced Plastic), HDPE(High Density Polyethylene), and CFRP(Carbon Fiber Reinforced Plastic) materials used for small ship construction were cured in Gyeokpo Port (Jeonlakbuk-do) for about 80 days. Then, attached organism removal experiments were performed using a water jet nozzle. The results show that seaweeds, such as laver, were removed when the distance between the nozzle and the specimen was 1.8 cm and the pressure was 100 bar. Furthermore, it was confirmed that the cleaning of barnacles was possible only when the pressure was 200 bar or more.

• Proceedings of the Korea Society of Environmental Toocicology Conference
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• 1996.12a
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• pp.44-44
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• 1996

• Proceedings of the Zoological Society Korea Conference
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• 1999.10b
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• pp.107.1-107
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• 1999

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.1561-1565
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• 2006

수제는 주로 호안 또는 하안 전면부에 설치하는 구조물로써 기존의 수제 설치는 하안 및 제방의 보호, 유로제어 및 주운 등의 목적에 의해 이루어졌다. 최근 들어서는 수제하류부의 흐름분리로 인해 발생되는 재순환 영역(recirculation zone)과 국부세굴에 의해 발생하는 세굴공이 수중생물의 다양한 서식처 및 홍수 시어류의 피난처로 활용될 수 있다는 점 등의 환경기능이 부각되면서 수제에 대한 설치목적이 다양화 되었다. 월류수제는 흐름이 수제 투과정도를 나타내는 투과율과 함께 다뤄지기는 기존의 실험연구에서는 수위가 수제의 머리부를 초과함에 따라 월류되는 흐름은 과도한 난류의 발생 등 투과수제에 비해 수제부근에 더 많은 영향을 미친다고 하였다. 이러한 과도한 난류의 발생은 수제를 월류하는 흐름은 상류에서는 가속되다가 수제 하류부로 흘러내리면서 다시 감속되어 교란되기 때문이다. 이러한 월류수제의 흐름특성은 수제 주변 국부세굴에 영향을 미친다. 특히 우리나라 하천은 홍수시 수위의 변화가 매우 크기 때문에 일반적인 불투과 수제라 하더라도 대부분의 수제가 월류수제처럼 거동한다. 따라서 수위가 증가함에 따라 월류가 발생하는 수제의 경우 비월류 구조물과는 세굴심의 변화가 다르게 발생할 수 있다. 본 연구에서는 월류수제 주변에서 발생되는 국부세굴이 수중생물의 다양한 서식처 및 피난처로 활용될 수 있다는 관점에서 세굴영역(세굴부피)과 세굴심의 관계에 대한 수리모형실험을 수행하고 분석하였다. 월류수제의 세굴실험은 축척의 영향을 최소화하기 위해 $7m(W){\times}40m(L){\times}1.5m(H)$ 규격의 대형 수로에서 수행하였으며 세굴변화에 미치는 시간축척의 영향을 파악하기 위해 $70{\sim}90$ 시간 동안 실험을 수행하였다. 세굴의 측정은 투명한 아크릴로 제작된 수제 내부에 CC카메라를 수제 전 후면 및 측면에 설치하여 월류수제의 세굴 발생을 실시간으로 측정하며 동시에 수제의 각 면에 각각 3개의 압력센서를 설치하여 압력분포를 측정함으로써, 월류수제 주변의 압력변화에 따른 세굴심의 실시간 변화를 비교할 수 있도록 하였다.

• Korean Journal of Environmental Biology
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• v.39 no.1
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• pp.19-31
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• 2021

We investigated the distribution characteristics of mussels (Mytilus coruscus) growing in the Geomundo sea area by water depth. The research was also conducted to identify the surrounding benthic organisms. Mussels showed high density and low obesity in low water depths. The lower the density, the higher the obesity level appeared in deeper water. The morphological characteristics also appeared to increase as the water depth deepened. In addition, the shell length and total weight were more strongly correlated at a depth of 12 m than at 2 m. The total weight by the growth of the shell length and shell height was affected by the water depth. The analysis showed that the density and biomass of the algae inhabiting the surroundings decreased somewhat as the water depth increased. In benthic animals, the number of mussels tended to decrease slightly at the point where oysters dominated, at a depth of 2 m. Conversely, the number of oysters tended to decrease in deeper water dominated by mussels. Thus, the spatial competition between oysters and mussels was affected by the water depth. Also, mussels did not appear in areas where large algae flourished, suggesting that the survival of mussels was affected by the presence or absence of large algae.

• Korean Journal of Microbiology
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• v.27 no.2
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• pp.130-138
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• 1989

Microbiological parameters such as bacterial biovolume and biomass in Soyang Reservoir was statistically analyzed with the physico-chemical enviromental factors. Analysis of correlation and multiple regression showed that temperature affects most of microbiological parameters. Variations of total bacterial number, total bacterial biovolume and saprophyte number were highly correlatd with the concentrations of chlorophyll a and pheophytin a. Bacterial production by the $^{3}H$-thymidine incorporation rate was largely affected by Seston. It suggests that microbiological factors such as bacterial biovolume and bacterial biomass were controled by the concentration of seston and distribution of phytoplankton which acts as carbon and energy source for the bacterial community in the water column of Soyang Reservoir.

• Journal of Korean Society of Environmental Engineers
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• v.34 no.8
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• pp.528-532
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• 2012

This study investigated the possibility of phosphogypsum (PG) recycle as an embankment material by eco-toxicity experiments for S. capricornutum, T. suecica and D. magna. The eco-toxicity experiment was studied according to column leachates from PG mixing ratio, and a specific growth rate of S. capricornutum was usually higher than that of T. suecica. For D. magna, 0.3 of toxicity unit was obtained, which indicated the below of toxicity value of 1 at PG50 condition during a 48-hr test. A minor effect of column leachate samples on three organisms was observed. This study suggested that PG was satisfied with the criteria of waste recycle and could be reused at PG30 condition.

• Proceedings of the KAIS Fall Conference
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• 2009.05a
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• pp.781-784
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• 2009

본 논문에서는 실제 수중 환경에서 선박 또는 잠수함으로부터 발생하는 인위적인 천이신호와 돌고래, 새우 등의 해양 생물로부터 발생하는 천이신호들을 식별하기 위한 특징벡터 추출 기법을 제안하였다. MFCC와 엔트로피 기반의 웨이블릿 패킷 기법을 이용하여 특징을 추출하고, 이 두 특징들을 동시에 적용하여 수중 천이신호를 식별하고자 한다. 기존의 방법인 MFCC와 웨이블릿 패킷 기법과 이 두 방법을 동시에 적용했을 때의 식별률을 비교하였고, 전방향 신경회로망(feed-forward neural network)을 그 특징벡터의 성능을 평가하기 위한 식별기로 사용하였다.