• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.601-602
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• 2001

키조개는 우리 나라를 비롯하여 일본, 대만, 인도, 태평양 연안에 널리 분포하는 자원으로 우리 나라에서는 남해안의 가막만, 여자인 장흥연인 남해도 연안과 서해안의 위도근해, 충남연안, 인천의 선갑도근해 등지에 많이 서식하고 있다. 우리나라 연안에서 키조개자원의 생산은 일반해면어업에서의 총생산량 6,456mt 가운데 77％(5,006mt) 이상이 충남 연안해에 집중되어 있으며 (수산통계연보, 1998), 잠수기어업에 의해 주로 생산되어 전량 수산업협동조합을 통해 위판되고 있다. (중략)

• Journal of Advanced Navigation Technology
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• v.23 no.2
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• pp.125-133
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• 2019

In this paper, a new study was performed on the docking of AUV to docking station using light and light sensor system under the water. For this, a guiding system for AUV loading sensor system composed of lense, light sensor, signal processor, and processor and docking system with LED are proposed. An analysis on light sensor system and light-collecting lense to obtain accurate relative angle and measurement accuracy was performed. To prove this, the system was built and a basic experiment was performed. Finally, the feasibility of the developed docking system was verified the test in the water tank.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.3
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• pp.91-99
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• 2019

Naval Ships have a number of requirements related to performance. Naval ship acquisition takes a long time from initial planning to delivery, and various products such as drawings and reports are created. In complex systems, such as naval ships, it is difficult to maintain the required traceability through these outputs. The basic design of the ship is an important step to determine the specifications, performance, and equipment of the ship. It is necessary to apply the systematic requirements management process. The basic design manages the requirements in accordance with the systems engineering-based technical review process, but the actual system architecture design process is not presented. The traceability between the requirements and the functional and physical architectures of components is unclear. This paper examined how to design the system architecture required for specification and system design, and the design results were verified using SE-based technical review process for requirements management. A step-by-step process for designing a submarine system architecture is presented and verified using the SE technical review. This facilitates the specification of the requirements and system architecture design, and supports traceability management and verification of the requirements. The proposed process can be applied in various ships including submarines.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.9
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• pp.142-149
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• 2019

In the early 2000s, the Korean government first attempted to acquire nuclear-powered submarines as strategic assets. Acquisition of nuclear-powered submarines must overcome the challenges of the initial costs and operating costs of trillions of US dollars per ship, must be agreed to by the international community (including neighboring countries) and in a national consensus, and must have an established technical infrastructure (including manpower). The US navy has been working with governments that want to acquire nuclear propulsion warships since the 1950s, and in 1982, they enacted an executive order called the United States Naval Nuclear Propulsion Program to consolidate efforts and prepare for the future, which sets out the organizational structure, authority, and responsibilities of US governmental management, and integrates national efforts. This paper is to gain valuable wisdom from the U.S. Naval Nuclear Propulsion Program by analyzing all of its histories and contributions, thereby providing valuable lessons for a future program in Korea. It might not be possible to follow the U.S.A. one-on-one because of the scale of national and military forces, but at least we can avoid time and effort spent on trial and error.

• Journal of the Society of Naval Architects of Korea
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• v.59 no.5
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• pp.288-295
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• 2022

In this study, the force and moment acting on a Joubert BB2 submarine model at depths near the free surface were measured through a captive model test with the scale ratio of 1/15. Based on the experiment, the pitch moment and heave force due to the "Tail suction effect", including the change in surge force with depth near the free surface, were quantitatively analyzed. The change of force and moment according to the relative position of the sail and the free surface was reviewed with the free surface waves generated for each depths. As a result, the angle of attack of the hull to counteract the pitch moment induced by the tail suction effect was derived. The effect of the hydrostatic moment component according to the angle of attack on the equilibrium of pitch moment was also taken into account. The control plane performance tests for the X-type rudder and sail plane were conducted in snorkel and surface depth conditions to figure out the control plane angles for the neutral level flight of the submarine at near free surface. The results of this study are expected to be used as a reference data for the neutral level flight of the submarine at near free surface operation in the free running model test as well as numerical studies.

• Journal of the Society of Naval Architects of Korea
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• v.32 no.3
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• pp.19-28
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• 1995

This paper presents hull form design details and performance characteristics of the SWATH ship 'SEON JIN' built as an underwater test support ship. The hull form is developed systematically varing sets of 11 form parameters which define a unique hull under waterline. Using this geometry variation scheme we have generated a number of alternatives and selected the final hull which fulfills the design objectives and matches the design constraints. After selecting the final hull form we have investigated performances thoroughly through model tests, and confirmed through sea trials that the performance goals be achieved.

• The Journal of the Korea institute of electronic communication sciences
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• v.8 no.1
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• pp.27-40
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• 2013

This study is about development of technology system for an advanced deep-sea unmanned underwater robot of S. Korea analysed by the application of scenario planning. It was developed a 6000m class next-generation deep-sea unmanned underwater vehicle(or robot, UUV) system, soonly ROV 'Hemire' and Depressor 'Henuvy' in 2006 at S. Korea and motion control, adaptive control algolithm, a work-space manipulator control algolithm, especially the underwater inertial-acoustic navigation system robust to initial errors and sensor failures. But there are remained matters on position tracking of the USBL, inertial-acoustic navigation system, attitude sensor, designed sonar sensors. So this study suggest the new idea for settle the matters and then this idea help the development of the underwater inertial-acoustic navigation system robust to initial errors and sensor failures, such as acoustic signal drop-out, by modifying the error covariance of the failed sonar signal when drop-out occurs. As a result, the future policy for deep-sea unmanned underwater robot of S. Korea is to further spur the development of new technology and more improvement of the technology level for deep-sea unmanned underwater robot system with indicator and imaginary wall as external device.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.108-110
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• 2018

항공 드론의 비약적 발전에 비해 소형 선박을 이용한 Sail Drone의 기술 개발은 이제 막 초보적인 수준을 벗어나, 해양과학 조사에 이용되고 있는 추세이다. Sail Drone은 항공드론으로는 할 수 없는 해양의 조류, 해수 온도, 염분 농도 및 염분의 비중, 오염 해역의 측정과 어류의 분포 등 다양한 해양과학 자료의 조사뿐만 아니라, 선형 및 사용 용도를 변경하면 군사적으로도 적지의 관찰과 적 잠수함의 추적, 공격목표물에 대한 충돌 폭파, 아군의 미사일 등 전략무기의 공격 목표(Target) 등 다양한 방법으로 이용 할 수 있다. 추진동력을 얻기 위한 재생에너지 기술, 해양과학 Sensor의 설치 및 이용에 관한 기술, 획득한 정보의 전송 및 판독에 관한 기술, 무인 항행 조정 기술, GPS를 포함한 위치정보 이용 기술 등 복합적이고도 융합적인 기술이 요구되는 Sail Dronen 개발에 앞서 무인 제어선박을 연구하였다.

• The Journal of the Acoustical Society of Korea
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• v.33 no.6
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• pp.366-374
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• 2014

With the advent of submarine detection technology using low-frequency active sonar there is a call for a new submarine stealth device that can replace the existing passive anechoic tiles. Proposed in this study is a low-frequency echo reduction technique based on active impedance matching, which employs a tile projector designed to cover a wide area such as the surface of a ship. To judge the feasibility of the active impedance matching technique finite-element simulations of low-frequency echo reduction are performed. Based on the analysis, a tile projector is designed, fabricated, and tested in an acoustic tank for its low-frequency echo reduction performance.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.44 no.3
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• pp.70-76
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• 2007

Hemire is a 6000m class deep-sea ROV, which is recently developed by Maritime & Ocean Engineering Research Institute (MOERI) of Korea Ocean Research & Development Institute (KORDI) for 6 years since 2001, sponsored by the Ministry of Maritime Affairs and Fisheries (MOMAF). Hemire dove upto 1,065m for the first east sea trial last April, and touched a 2,026m bottom of the east sea last September. Finally, last November, Hemire reached a 5,775m bottom of the pacific ocean successfully. This showed our own technologies for design and development of a deep-sea ROV as 4th nation in the world, and we made a great step forward for deep-sea exploration. This paper describes a general overview of a 6000m class deep-sea ROV, and briefly explains development procedure of Hemire and Henuvy. Finally, results of sea trial are summarized.