• 한국해안·해양공학회논문집
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• 제20권6호
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• pp.621-629
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• 2008

한반도와 동해를 포함하는 지역적인 지오이드를 세밀화하는 과정을 설명하고, 계산 결과를 제시하였다. 지오이드의 높이와 해수면의 높이의 비교와 최종적인 세밀화의 결과를 해석하고 제시하였다. 세밀화된 지역적인 해양 지오이드는 이전에 보고된 것과 비교하여 더 나은 해상도를 가지며 해저수심과의 상관성을 갖는다. 산정된 지오이드의 일반적인 패턴은 기존의 연구와 잘 일치하며, 동해에서의 세밀화된 해양 지오이드와 수심과의 상관관계는 (1) $117^{\circ}E{\sim}142.5^{\circ}E/24^{\circ}N{\sim}52^{\circ}N$의 영역에서는 0.44, (2) $127^{\circ}E{\sim}142.5^{\circ}E/32^{\circ}N{\sim}50^{\circ}N$의 영역에서는 0.47이다.

• 한국해양환경ㆍ에너지학회지
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• 제8권4호
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• pp.213-219
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• 2005

본 연구는 310종 다성분 동시분석 법을 활용하여 남해 연안 해역 중 광양만, 여자만, 가막만에서의 미량유기오염물질에 의한 오염특성을 규명하고자 하였다. 채수지점에서 검출된 주요 미량유기오염물질은 aliphatic, polycyclic compounds 와 같은 CH기의 화학물질과 aromatic ammines, nitro compounds와 같은 CHN(O)기의 화학적 구조를 갖는 물질이었다. 미량유기오염물질의 농도는 겨울철보다는 여름철에 높게 나타났으나 검출된 물질 종수와 계절적 상관성은 뚜렷하게 나타나지 않았다. 남해 연안 해역에서 검출된 농약의 총량은 $ND{\sim}9.11$ 이었으며 광양만과 가막만에서 살충제와 제초제의 검출이 집중적으로 관찰되었다. 또한 남해 연안 해역에서 환경호르몬성 물질은 총 6종이 검출되었다. 이러한 결과로부터 남해연안해역의 주요오염인자는 살충제와 제초제, 그리고 수종의 환경호르몬성 물질로 판단된다.

• Journal of Advanced Marine Engineering and Technology
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• 제32권1호
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• pp.184-191
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• 2008

In order for a mobile robot to move under unknown or uncertain environment, it must have an environmental information. In collecting environmental information, the mobile robot can use various sensors. In case of using ultrasonic sensors to collect an environmental information, it is able to comprise a low-cost environmental recognition system compared with using other sensors such as vision and laser range-finder. This paper proposes a map building algorithm which can collect environmental information using ultrasonic sensors. And also this paper suggests a traveling algorithm using environmental information which leads to the map building algorithm. In order to accomplish the proposed traveling algorithm, this paper additionally discusses a position revision algorithm.

• Nuclear Engineering and Technology
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• 제55권6호
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• pp.2158-2165
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• 2023

Marine radioactivity monitoring is critical for taking immediate action in case of unexpected nuclear accidents at nuclear facilities located near coastal areas. Especially when the level of contamination is not predictable, mobile monitoring systems will be useful for wide-area ocean radiation survey and for determination of the level of radioactivity. Here, we used a silicon photomultiplier and a high-efficiency GAGG crystal to fabricate a compact, battery-powered gamma spectroscopy that can be used in an ocean environment. The developed spectroscopy has compact dimensions of 6.5 × 6.5× 8 cm³ and weighs 560 g. We used LoRa, a low-power wireless protocol for communication. Successful data transmission was achieved within 1.4 m water depth. The developed gamma spectroscopy was able to detect radioactivity from a ¹³⁷Cs point source (3.7 kBq) at a distance of 20 cm in water. Moreover, we demonstrated an unmanned radioactivity monitoring system in a real sea by combining unmanned surface vehicle with the developed gamma spectroscopy. A hidden ¹³⁷Cs source (3.07 MBq) was detected by the unmanned system at a distance of 3 m. After successfully testing the developed mobile spectroscopy in an ocean environment, we believe that our proposed system will be an effective solution for mobile real-time marine radioactivity monitoring.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2001년도 추계학술대회 논문집
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• pp.73-78
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• 2001

In this paper, overall planning and design procedure for the marine transportation are examined. For this purpose, marine transportation analysis for the North Nemba deck structure has been carried out. The results of analysis with the rigid barge transportation are compared to those with the barge considering its flexibility. The environmental conditions, especially waves, are shown to be the most important factor which affected on the structural strength, deformation and fatigue damage.

• Environmental Analysis Health and Toxicology
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• 제25권1호
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• pp.19-26
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• 2010

Discharged materials from the point or non-point source are released into the sea, and as the results, marine environment is directly affected. We must estimate the impacts of contaminants to marine pollution rapidly and accurately. Therefore, it is needed on early warning system for appreciating marine environmental impacts, and required a bioassay to evaluate abnormal changes. A bioassay test was developed to examine the effects of heavy metal contaminants on the early life stages of the marine annimals. We have studied the effects of metals on early development of a sea urchin species, Strongylocentrotus intermedius. S. intermedius embryos were tested with six metals (Cu, Ag, Zn, Cd, Cr, Ni) and showed the highest sensitivity to Cu as well as the lowest sensitivity to Cd. The order of biological impact for metals was Cu>Ag>Ni>Zn>Cr>Cd. In accordance with the results, sea urchins embryos can provide biological criteria for seawater quality assessment. The sensitivity of developmental bioassay whith S. intermedius is at intermediate level among marine organisms commonly used in aquatic bioassays. And this sea urchin can be routinely employed as a test organism for ecotoxicity assays.

• 한국산업융합학회 논문집
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• 제27권1호
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• pp.173-182
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• 2024

While the current share of marine energy in South Korea is less than 1%, it is globally recognized as a resource approximately four times the annual electricity production. Considering the diverse geographical features of the East Sea, South Sea, and West Sea, marine energy development is crucial for South Korea and essential for achieving the 2050 carbon neutrality goal. Policy efforts for marine energy deployment focus on establishing an innovative, open, and integrated R&D system to respond flexibly. The construction of a scientific, economic, and social valid site selection system, along with a maritime spatial planning regime that considers environmental and socio-economic impacts, is emphasized. To expedite the early activation of marine energy, comprehensive policy endeavors, including discriminatory support policies and participation in international standardization, are anticipated to contribute to the sustainable development and dissemination of marine energy. Marine renewable energy plays a significant role in sustainability and addressing climate change, considered an essential component of South Korea's efforts toward carbon neutrality.

• 한국해양바이오학회지
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• 제11권2호
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• pp.52-61
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• 2019

Over the past few decades, microalgae-based biotechnology conjugated with innovative CRISPR/Cas9-mediated genetic engineering has been attracted much attention for the cost-effective and eco-friendly value-added compounds production. However, the discharge of reproducible living modified organism (LMO) into environmental condition potentially causes serious problem in aquatic environment, and thus it is essential to assess potential environmental risk for human health. Accordingly, in this study, we monitored discharged genetically modified microalgae (GMM) near the research complex which is located in Daejeon, South Korea. After testing samples obtained from 6 points of near streams, several green-colored microalgal colonies were detected under hygromicin-containing agar plate. By identification of selection marker genes, the GMM was not detected from all the samples. For the lab-scale environmental risk assessment of GMM, acute toxicity test using rotifer Brachionus calcyflorus was performed by feeding GMM. After feeding, there was no significant difference in mortality between WT and transformant Chlamydomonas reinhardtii. According to further analysis of horizontal transfer of green fluorescence protein (GFP)-coding gene after 24 h of incubation in synthetic freshwater, we concluded that the GFP-expressed gene not transferred into predator. However, further risk assessments and construction of standard methods including prolonged toxicity test are required for the accurate ecological risk assessment.

• 한국환경과학회지
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• 제19권11호
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• pp.1355-1362
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• 2010

This study was carried out in order to observe how the bay sediment would be changed with microbial treatments and a chemical oxidant like $CaO_2$. The sediment during the treatments was analyzed in terms of pH, ORP, volatile organics content, COD, AVS, T-N, and T-P. With $CaO_2$ treatment, pH was kept over 9.66 and ORP ranged from +4.70~+46.0, which meant an aerobic state meanwhile with the microbial treatment those were worse. In addition the chemical treatment showed better environmental index values than the microbial one: volatile organics content and COD values in the former were 12.9% and 37.9% while those in the latter were 4.5% and 18.7%, respectively. AVS and T-P were 71.1% and 100% versus 56.5% and 85.8%, respectively. However, the microbial treatment was better for T-N(66% higher). On the other hand, both treatment at a time enhanced all the environmental indices but COD meantime pH and ORP values were lower than with the chemical treatment only. Thus additional input of an oxygen generator like $CaO_2$ could improve the environmental state of a bay sediment where the biological treatment is going on.

• 한국해양환경ㆍ에너지학회지
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• 제16권3호
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• pp.181-188
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• 2013

인간의 인위적 활동에 의한 이산화탄소의 배출 증가는 지구 온난화의 원인 중 하나로 알려져 있으며, 기상이변 등과 같이 지구 환경에 막대한 영향을 미치고 있다. 이로 인해 최근 들어 이산화탄소 배출량을 규제하기 위한 움직임이 활발해지고 있다. 또한 배출된 이산화탄소의 환경영향을 평가하기 위해, 일본 조선학회 산하의 IMPACT 위원회에서는 자연의 개발로 인한 환경영향과 경제성을 동시에 고려하여 평가할 수 있는 포괄적 지표인 Triple I (III)를 제안하고 있다. 본 연구에서는 III를 적용하여 컨테이너 선박의 운항 시 배출되는 이산화탄소로 인한 환경영향 및 경제성에 대해 생애주기 평가를 통해 정량적으로 비교하였다. 또한 선박의 규모 변화 및 운항 항로의 변경에 따른 포괄적 환경영향평가를 실시하였다. 결과적으로 선박의 운항에 의한 포괄적 환경영향평가는 선박의 규모보다는 이산화탄소 배출량과 밀접한 선박의 운항 항로에 보다 더 민감한 것으로 판단되었다.