• Journal of Navigation and Port Research
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• v.35 no.3
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• pp.227-233
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• 2011

This paper presents the tracking and stabilization problem of a night vision system for marine surveillance. Both a hardware system and software modules are developed to control azimuth and elevation axes independently with compensation for ship motion. A two degree of freedom(2DOF) PID controller is designed and its parameters are tuned using a real-coded genetic algorithm(RCGA). Simulation demonstrates the effectiveness of the proposed method.

• The Journal of Korean Institute of Information Technology
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• v.16 no.12
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• pp.41-47
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• 2018

The buoy-enabled underwater surveillance system is a device that is installed in a particular sea area and operated for a certain period of tine and moved to another sea area after recovery. In this paper, a mooring method which is applied for a buoy-enabled underwater surveillance system was selected to maintain installation and enure stable operation. Also, the structure of the mooring line was designed. Two-point mooring method was selected considering interference with the communication cable of array-assembly. The composite structure of buoy chain, nylon rope, and anchor chain is designed as the basic component of mooring line. For the verification of design, a numerical simulation and wave tank experiment were performed. Their results were confirmed similarity in test condition. Finally, the mooring lines were designed for the environment of the sea trial location. The mooring line produced by the final design confirmed the stability above the significant wave height considered in the design on the sea trial.

• Defense and Technology
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• no.8 s.234
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• pp.76-85
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• 1998

잠수함은 언제, 어디에서, 어떻게 나타날지 모르는 바다의 게릴라이기 때문에 상대국가에게 해상전력의 상당부분뿐만 아니라 지상전력의 일부까지도 대 잠수함 정찰/감시 임무에 투입하도록 하는 매우 중요한 전략적 가치를 갖는다.

• Proceedings of KOSOMES biannual meeting
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• 2018.06a
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• pp.116-116
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• 2018

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.10a
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• pp.326-328
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• 2013

선박의 고속화 및 대형화, 통항량의 증가와 더불어 항로표지시설에 대한 수요와 기능이 강조되는 시점에서 항로표지의 관리와 운영에 대한 보호 및 안전사고 예방을 위한 대책 일환으로 해상 환경에 맞는 감시장비에 대한 연구와 활용 방안을 제안하는 목적으로, 인력에 의한 관리 한계를 보완하고, 고비용 감시장비에 대한 예산 절감 대안을 제시하고자 하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2019.11a
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• pp.84-86
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• 2019

해양관측정보 및 안전정보 제공을 목적으로 운영하는 해상 부이(등부표)에 영상정보감시 및 영상전송장치를 개발하여 설치 운영하고, 이를 통해 얻어진 영상정보 자료를 기반으로 시설물 유지관리 시 활용방안과 영상으로 실제 관측 가능한 해양 정보 등을 검토하였다.

• Journal of Navigation and Port Research
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• v.30 no.8 s.114
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• pp.721-727
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• 2006

Ammoniac nitrogen excretion is not able to be removed in ocean fish farm. It is the reason for fish being dead in large quantities or declining feeding activity that ammoniac nitrogen is not removed efficiently in ocean fish farm. Because of declining with feeding activity, it is true that feed is wasted for the present. To solve this problem, NH3, one of environment factors in ocean fish farm, monitoring system is suggested to be formed in this paper.

• Journal of the Korean Society of Marine Environment & Safety
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• v.10 no.2 s.21
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• pp.55-60
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• 2004

As GNP increases, many peoples need the seafood with high quality. In Korea, aquaculture is one of major incomes for fishing households and records $50.6\%$ of total incomes for domestic fishery. The loss of aquaculture farm due to thievery at sea increases every year. In this research, we propose the system model for development of radar surveillance system, which protects aquaculture farms. For the proposed system, general requirements are described Our system is cost-effective when it is applied to domestic fishing households.

• Proceedings of KOSOMES biannual meeting
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• 2004.11a
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• pp.151-156
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• 2004

In Korea, aquaculture is one of major incomes for fishing households and amounts to $50.6\%$ of total incomes for domestic fishery. The loss of aquaculture farm due to thievery at sea increases every year. In this research, we propose the system model for development of telemonitoring system, which protects aquaculture farms. For the proposed system, general requirements are described. Our system is cost-effective when it is applied to domestic fishing households.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.8 no.4
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• pp.293-301
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• 2010

Optical fiber cable, as a sensor, was installed on the wall of KAERI(Korea Atomic Energy Research Institute) Underground Research Tunnel(KURT) in order to monitor the physical stability of the tunnel, which was constructed for technical development and demonstration of radioactive waste disposal. This monitoring system has two simultaneous measurements of temperature and strain over time using Brillouin backscatter. According to the results of the monitoring from Jan. 2008 to Nov. 2009, there is no significant displacement or movement at the tunnel wall However, the cumulative volume of total strain increased slightly as time passes with the comparison of the reference observation, which was measured in Jan. 2008. The change in cumulative volume of total strain indicates that the strain level had been affected by saturation and de-saturation phenomena due to groundwater fluctuation at several points at KURT. This system is based on the distributed sensing technique concept, not point sensing. By using this system, a displacement can be detected with the range from $20{\mu}{\varepsilon}$ to $28,000{\mu}{\varepsilon}$ every 1m interval in minimum. A temperature variation can be monitored at every 0.5m interval with the resolution of 0.01 in minimum. Based on the study, this monitoring system is potentially applicable to long term monitoring systems for radioactive waste disposal project as well as other structures and underground openings.