• Journal of Korea Ship Safrty Technology Authority
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• s.32
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• pp.12-29
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• 2012

본 연구는 태양광 발전시스템을 선박에 설치하고, 동 시스템과 연계한 선박 발전시스템에 대한 해상 실증 실험을 통하여 발전 시스템의 작동, 신뢰성과 선박 복원성능 및 경제성을 평가하고, 육상으로 송전하는 계통연계형 시스템에 대한 실험을 동시에 수행하였다. 독립형 발전시스템 선내 부하에 안정적인 전원 공급이 가능하고, 태양광 발전과 선내 발전시스템간의 하이브리드 운전이 안전하여 상용화에 문제가 없으며, 계통연계형 태양광 발전 수익모델 가능성을 확인하였다. 본 시스템 설치선박은 단기간 투자비용 회수가 가능하고, 경제성이 있을 것으로 판단된다. 또한, 태양광 관련 설비에 대한 안전을 확보하기 위하여 안전기준(안)을 제시하였으며, 앞으로 다양한 용량의 발전시스템 선박에 적용이 가능할 것이다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2011.06a
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• pp.80-81
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• 2011

Canada British Columbia 주의 Prince Rupert 와 Port Hardy(503km) 를 1주일에 2회 왕복하던 Queen of the North 호가 2006년 3월 22일 Gill Island 북쪽 해상에서 좌초되었다. 사고 후, 선박에 탑재된 Electronic Chart System(ECS)을 수거하여 선박의 항해자료를 회수키로하고, 2006년 6월 15일 해양탐사로봇을 이용하여 해저 약 453m 지점에 착저된 선박으로부터 ECS 컴퓨터를 수거하였고 Maker인 Transas사는 수거된 ECS의 Data를 복원하여 선주사에 재공하였다. 이에 따라 캐나다 교통안전국 (Transportation Safety Board of Canada)는 재현 결과물을 통하여 사고원인을 규명한 사건이다.

• 한국해양학회지
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• v.30 no.2
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• pp.116-124
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• 1995

Marine, shallow seismic data have been acquired and processed by newly developed multi-channel(6 channel), PC-based digital recording and processing system. The digital processing system includes pre-processing, swell-compensation filter, frequency filter, gain correction, deconvolution, stacking, migration, and plotting. The quality of processed sections is greatly enhanced in terms of signal-to-noise ratio and vertical/horizontal resolution. The multi-channel, digital recording, acquisition and processing system proved to be and economical, efficient and easy-to-use marine shallow seismic tool.

• KSBB Journal
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• v.11 no.5
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• pp.529-535
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• 1996

Methyl frucloside was purified from the aqueous sugar/methyl fructoside solution by liquid chromatography using Amberlite IRA-900, strong anion-exchange resin. The optimum operating conditions, resolution and productivity of methyl fructoside were discussed to evaluate the practical feasibility of the proposed chromatographic separation process of methyl fructoside which is useful as a new starting material for sugar ester synthesis. The linear chromatography model with HETP was well applied to the chromatographic separation process of methyl fructoside and the theoretical solution successfully predicted the elution chromatogram of methyl fructoside and sucrose at different superficial linear velocity of eluent for rectangular feed with different loading volume of packed bed. The optimum operating conditions were found to be 75% with the loading volume of packed bed at 1.13 cm/min of the superficial linear velocity at $60^{\circ}C$, and gave the productivity of methyl fructoside of 7 mg/g-resin/h with the resolution of 1.1.

• Journal of Korean Society of Environmental Engineers
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• v.22 no.4
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• pp.679-688
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• 2000

Dispersants, which are used to break water-in-oil emulsions and to remediate oil-spills, are another water pollutants. In this study, magnetic separation technology was applied to remove dispersants from the sea. Magnetite and maghemite were used as magnetic sorbents and SDDBS, an anionic surfactant and Triton X-100, a nonionic surfactant, were employed as dispersants. Batch experiments were undertaken to study the sorption capacity and sorption equilibrium, and water-bath experiments were conducted to simulate the real situation and to describe the recovery of magnetic particles by the permanent magnet or electromagnet. Maghemite has rather constant removal efficiency for dispersants, regardless of surfactant species. On the other hand, removal efficiency by magnetite is higher for anionic surfactant than maghemite and is higher in distilled water than in seawater which contains more ions. The sorption of dispersants to magnetite is explained by electrostatic attraction and that of maghemite is described not only by electrostatic attraction, but also by structural characteristics that provide high sorption ability and surface condition. Water bath experimental results showed that recovery efficiency of magnetic particle after sorption for dispersants is nearly 100%. It is suggested that this magnetic separation technology is an effective way of dispersant removal because of short operating time, high sorption capacity, and high recovery efficiency of sorbents.

• Proceedings of KOSOMES biannual meeting
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• 2008.05a
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• pp.117-120
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• 2008

As we can see at the oil spill occident on the coast of Taean, the viscosity of the spilled oil becomes thicker as time goes by. It becomes waste oil with the form of tar. It moves to other areas following a tide. When the temperature of the water goes up, the viscosity becomes lighter and forms oil film. It repeats the process spreading to and polluting extensive areas where the tide reaches. People have used hand nets to collect waste oil of tar at the sea. But it is very difficult for them to collect the tar type waste oil spread on large areas before it reaches to the beach. This paper tried to find a way to collect the tar type waste oil efficiently. It used absorption mat of boom type that uses the attachment characteristics of the tar type waste oil and floating waste recovery device of net type. It tested the possibility of using the devices at the oil spill accident on the beach of Taean. The result showed that net type recovery device was much more efficient in collecting the waste oil in short time than the hand net system of people. It confirmed that the net type recovery device could be used to collect tar type waste oil.

• The Journal of the Acoustical Society of Korea
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• v.20 no.8
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• pp.74-80
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• 2001

Because of ocean waves, swell, steering corrections, etc, the hydrophones of a towed array will not live along a straight line. However the degradation of bearing estimation performance occurs when beamforming is carried out on the hydrophone outputs of an acoustic towed array which is not straight. So it is required to estimate the shape of the array for the improved beamformer output. In this paper, an iterative array shape estimation technique is presented, which is based on the use of the least squares polynomial fitting to the data from heading sensors. The estimation error and the influence of deformations on the performance of the conventional beamformer output are investigated. Finally, the suggested method is applied to the real system in order to investigate the applicability.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2011.06a
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• pp.227-228
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• 2011

이 연구는 기름 유출 사고 시 해상에서 실시되는 방제활동을 보다 신속하고 효과적으로 실시하기 위해 사고초기부터 오일붐의 필요량을 신속하고 간단하게 제시해주는 프로그램의 개발에 대하여 알아보려고 한다. 유출유의 기계적회수를 위해 유회수기, 임시저장탱크의 필요수량은 제시되었으나, 오일붐은 제시되지 못하고 있다. 본 연구에서는 해양선진국 및 국제해사기구(IMO)에서 제시한 오일붐의 필요수량에 대한 방법들을 활용해 프로그램에서 유출규모, 유막특징의 입력을 통해 오일붐의 최소 및 권고량이 제시되도록 NI(National Instuments)사(社)의 LabVIEW 2010버전으로 프로그래밍 되었다. 기름유출 시 OBM Program을 이용해 누구나 쉽게 오일붐 필요량을 파악할 수 있고, 신속하게 오일붐의 필요량이 파악되어 방제활동 대응시간을 단축시켜주며, 단축된 대응시간만큼 피해규모의 축소를 기대할 수 있다.

• Journal of Navigation and Port Research
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• v.45 no.4
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• pp.181-185
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• 2021

This study deals with the development of a phrase buoy control system that can receive and analyze phrase information using an IoT-based communication network to determine whether a phrase is normal or missing, to manage the current state of the phrase, check the status of the phrase in case of abnormal conditions in the phrase, and conduct management of the phrase. The fishing gear management system and integrated control structure design using an IoT-based communication network were developed, and a system test and verification were carried out to verify the effectiveness of the system.

• Korean Journal of Remote Sensing
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• v.40 no.3
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• pp.295-305
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• 2024

This study aims to analyze the micro-sedimentary structures of the Hwangdo tidal flats using ultra-high resolution unmanned aerial vehicle (UAV) data. Tidal flats, located in the transitional area between land and sea, constantly change due to tidal activities and provide a unique environment important for understanding sedimentary processes and environmental conditions. Traditional field observation methods are limited in spatial and temporal coverage, and existing satellite imagery does not provide sufficient resolution to study micro-sedimentary structures. To overcome these limitations, high-resolution images of the Hwangdo tidal flats in Chungcheongnam-do were acquired using UAVs. This area has experienced significant changes in its sedimentary environment due to coastal development projects such as sea wall construction. From May 17 to 18, 2022, sediment samples were collected from 91 points during field surveys and 25 in-situ points were intensively analyzed. UAV data with a spatial resolution of approximately 0.9 mm allowed identifying and extracting parameters related to micro-sedimentary structures. For mud cracks, the length of the major axis of the polygons was extracted, and the wavelength and ripple symmetry index were extracted for ripple marks. The results of the study showed that in areas with mud content above 80%, mud cracks formed at an average major axis length of 37.3 cm. In regions with sand content above 60%, ripples with an average wavelength of 8 cm and a ripple symmetry index of 2.0 were formed. This study demonstrated that micro-sedimentary structures of tidal flats can be effectively analyzed using ultra-high resolution UAV data without field surveys. This highlights the potential of UAV technology as an important tool in environmental monitoring and coastal management and shows its usefulness in the study of sedimentary structures. In addition, the results of this study are expected to serve as baseline data for more accurate sedimentary facies classification.