• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2000.11a
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• pp.23-23
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• 2000

대표적인 잠수함 발사 유도탄의 수중에서의 발사 개념에 대한 기술 동향을 분석하였다. 세계 각 국의 수중 발사 유도탄 중 발사 형태가 특히 다른 Tomahawk, Sub Hapoon, Exocet SM39 유도탄에 대하여 그 발사 방법에 따른 기술 동향과 장단점을 비교 분석하였다. 대표적인 서방 세계 수중 발사 유도탄인 Tomahawk는 여러 가지 다른 형태가 있지만 잠수함 발사는 Wet Capsule에 의해 보호되며 어뢰 발사관을 이용하여 압축수에 의해 수중으로 배출되는데 잠수함과의 안전거리에서 견일줄이 유도탄 진행에 따라 장력을 발생 부스터를 점화시킨다. 이 부스터에 의해 수면까지 부상하며 부스터에 설치되어 있는 수중궤적 제어용 Jet-Tab이 수중운동을 제어한다. 수면에서 부스터의 추진력에 의해 대기로 진입하는데 일정속도 이상으로 가속된 후 부스터를 분리시키며 Turbo 엔진이 점화되어 계속 비행하게 된다.(중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.73-74
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• 2001

해양 수중 소음이 수중 무선 전화기를 설계하는데 있어서 미치는 영향에 대한 연구는 거의 이루어지지 않고 있다. 본 연구는 잠수기 어업용 수중 무선 전화기의 최적 반송 주파수 선정과 통신 가능한 수신기의 SNR 및 송신기의 최적 음향 출력 준위를 산정하기 위한 것이다. 우리 나라 잠수기 어업의 주 조업장에서의 수중 소음을 측정 분석하여 이들 수중 무선전화기 설계 패러미터을 해석하였다. (중략)

• Journal of the Korea Convergence Society
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• v.6 no.6
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• pp.177-183
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• 2015

The image information acquired by a model submarine is transmitted through the repeater. The control signal of a position for submarine and its speed is also controlled by the repeater. Shooting images of underwater circumstances are transmitted to the repeater where the received signal controls a position and speed of underwater submarine. This repeater is combined by a buoy that is floating on the surface to relay the signal of image as well as control between a control unit and a submarine whereas the repeater communicates wirelessly with a control unit. Due to wire communication between the repeater and the submarine, the underwater exploration can be smoothly carried out without a risk of loss of a model submarine. Also, connecting to the repeater and control unit wirelessly makes it possible to conduct easily the underwater exploration. The convergence technology that combines a wireless communication and a control as well as a model submarine is designed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.7
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• pp.176-183
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• 2020

A ship has three types of diving systems (Diver Stage Diving, Wet Bell Diving and Scuba Diving) to carry out a search-and-rescue operation. To reduce the possibility of decompression sickness, any diving systems shall comply with the decompression procedure according to the decompression table corresponding to the diving depth and diving time. The decompression procedure is largely divided into two methods: underwater decompression and underwater-onboard decompression. In particular, the surface interval shall not exceed 5 minutes, which is the phase from underwater decompression to underwater-onboard decompression, in accordance with the U.S Navy Diving Manual. However, the surface interval is greater than 5 minutes as a result of using Wet Bell Diving. This paper describes the result of cause analysis and measurement with improved Wet Bell Diving. Using improved Wet Bell Diving reduced the surface interval to less than 5 minutes. The result of the research can be used for operation and improving the performance of diving systems.

• Defense and Technology
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• no.1 s.167
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• pp.42-47
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• 1993

일반적으로 잠수함은 핵추진 잠수함과 디젤추진 잠수함으로 구분되는데, 디젤추진 잠수함은 비교적 소형으로 값이 싸고, 상황에 따라서 핵추진 잠수함보다 용이하게 운용할 수 있으므로 그 존재가치가 아직도 크다고 할수 있습니다. 특히 디젤추진 잠수함용으로 폐회로 디젤기관, 스털링기관, 연료전지, 소형 원자로등의 추진방법이 개발되어 금세기안에 실용화되리라 예상되므로 수중지속능력에 대한 디젤추진방식의 제한점은 곧 극복되리라 판단됩니다

• Journal of the Korean Institute of Intelligent Systems
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• v.20 no.4
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• pp.476-482
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• 2010

In this paper, we propose a robust path tracking control method for autonomous underwater vehicle with variable speed. The proposed path tracking controller consists of a kinematic controller and a dynamic controller. First, the kinematic controller computes the surge speed and yaw rate to follow the reference path with variable speed. Then the dynamic controller controls the thrust force and yaw torque to move the AUV actually. In the dynamic control, we assume that the sway speed is a disturbance. In addition the dynamic controller is designed based on sliding mode conrol. We also demonstrate the stability of the proposed control method by Lyapunov stability theory. Finally, simulation results illustrate the performance of the proposed control method.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.05a
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• pp.163-166
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• 2002

The underwater acoustic communication has been widely applied to various objects such as ocean exploration-development and military affairs. And recently for embodiment of the communication system that is installed in a submarine and underwater work system, many studies have been progressing. This scope of the main studies in the meantime. It made it possible for a diver and a scuba diver who arc difficult to notice the situation of the outside because of staying in the water to hear a sound through a small speaker by using a ultra sound transducer that a central frequency is 32KHz after modulation of a voice to give the information of the outside. Also in case of happening an emergency to a diver in the water, it made him/her ask for help to a person in the outside by pressing a key and send a letter data to a person in the outside by using a keyboard. Through this system, it is possible to send a voice or data between the underwater and the outside and it is available to a diver or skin scuba diver.

• Journal of the Korean Society for Marine Environment & Energy
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• v.10 no.4
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• pp.218-226
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• 2007

In modern naval ships, the design of submarines has continually evolved to improve survivability and it is also important to design ship against shock response. Exiting underwater ship design has been peformed due to results of static analysis considering shock acceleration by simple method. However, it can not be anticipated good assesment. The present study applied the Arbitrary Lagrangian-Eulerian (ALE) technique, a fluid-structure interaction approach, to simulate an underwater explosion and investigate the survival capability of a damaged submarine liquefied oxygen tank. The Lagrangian-Eulerian coupling algorithm and the equations of state for explosives and seawater were also reviewed. It is shown that underwater explosion analysis using the ALE technique can accurately evaluate structural damage after attack. This procedure could be applied quantitatively to real structural design.

• Journal of Advanced Marine Engineering and Technology
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• v.34 no.5
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• pp.735-742
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• 2010

This paper reviewed the diving standards for underwater work in hostile environment and analyzed applied Navy diving technique, diving equipments and procedure for rescue operation of Navy ship Cheonan's missing crew occurred near Bak Ryung Do in March 2010. The operation was done beyond the international standards and safety practice, and by considering the nature of the mission, urgency and effectiveness as well as the detailed facts such as duration and depth of the dive, type of work to be performed, environmental conditions, time constraints of early rescue operation, it is analyzed that using air scuba diving system was adequate.

• Journal of Advanced Marine Engineering and Technology
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• v.40 no.7
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• pp.655-662
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• 2016

This study proposes that a diving supervisor, who can perform the role of both a field manager and a supervisor, be introduced in the national qualification system. The goal was achieved by surveying the general status of the commercial diving sector, including the statistics of an underwater construction company, commercial diving equipment operation condition, diver working hours, diver supply and demand status, and underwater construction market size. The national qualification and national competency standard (NCS) systems were also analyzed to deduce the role definition and work scope of the diving supervisor. Consequently, the following proposition is made: the diving supervisor should be an "on-site manager with the highest job skill in the commercial diving field, who can perform the on-site process management as well as guide, supervise, and educate project participants and serve as an intermediary between the contractor and the workers." The responsibilities of the diving supervisor are proposed to include "diving planning and operation of the diving team," "diving with surface-supplied air and mixed-gas diving system," "chamber operation," "underwater construction," and "ship salvage." The persistent issues in commercial diving sectors, such as diver career development, management, and worker supervision, are expected to be largely resolved with the introduction of this qualification.