• 대한조선학회논문집
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• 제40권4호
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• pp.66-74
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• 2003

In non-contact underwater explosion shock test of a real naval ship, measurement of shock loadings and responses should require onboard system to be able to safely trigger an explosive and to simultaneously and successfully measure scores of shock signals in the deteriorated environment. For this purpose, we have developed a shock-hardened measurement system resistible to 170g peak acceleration having 4 msec duration by resiliently mounting general purpose measurement instruments in racks. The system can simultaneously measure and record 200 signals to evaluate shock leadings and responses of the test ship by triggering an explosive and measurement instruments at the same time. We prove the performance of the developed system by introducing the signal acquisition results from of a real ship underwater shock test, firstly performed in Korea.

• 산업경영시스템학회지
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• 제39권4호
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• pp.49-59
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• 2016

Naval combat system developed in-country is progressing at an alarming rate since 2000. ROK navy will be achieved all vessels that have combat system in the near future. The importance of System Engineering and Integrated Logistics Support based on reliability analysis is increasing. However, reliability analysis that everyone trusted and recognized is not enough and applied practically for development of Defense Acquisition Program. In particular, Existing Reliability Analysis is focusing on reliability index (Mean Time Between Failure (MTBF) etc.) for policy decision of defense improvement project. Most of the weapon system acquisition process applying in the exponential distribution simply persist unreality due to memoryless property. Critical failures are more important than simple faults to ship's operator. There are no confirmed cases of reliability analysis involved with critical failure that naval ship scheduler and operator concerned sensitively. Therefore, this study is focusing on Mean Time To Critical Failure (MTTCF), reliability on specific time and Operational Readiness Float (ORF) requirements related to critical failure of Patrol Killer Guided missile (PKG) combat system that is beginning of naval combat system developed in-country. Methods of analysis is applied parametric and non-parametric statistical techniques. It is compared to the estimates and proposed applications. The result of study shows that parametric and non-parametric estimators should be applied differently depending on purpose of utilization based on test of normality. For the first time, this study is offering Reliability of ROK Naval combat system to stakeholders involved with defense improvement project. Decision makers of defense improvement project have to active support and effort in this area for improvement of System Engineering.

• 한국군사과학기술학회지
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• 제25권3호
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• pp.259-266
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• 2022

This study aims to introduce missile live-fire during the ship operational test and evaluation(T&E) as a means of verifying the integrated combat capability(ICC) of various systems installed on naval ships. The research method identified domestic and foreign T&E systems and cases, and reports related to ICC, which were written during the ship's design stage. As a result of research, Republic of Korea is not conducting the missile live-fire at the ship T&E stage due to the lack of relevant systems, while the U.S. is conducting it based on the mission-based T&E and the end-to-end test system. As a way to improve within the current domestic ship acquisition systems, the reaction time analysis, a quantitative analysis result of ICC calculated at the ship basic design stage, was proposed to be verified by missile live-fire during ship operational T&E.

• International Journal of Naval Architecture and Ocean Engineering
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• 제1권2호
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• pp.70-77
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• 2009

Today, many middle-sized shipbuilding companies in Korea are experiencing strong competition from shipbuilding companies in other nations. This competition is particularly affecting small- and middle-sized shipyards, rather than the major shipyards that have their own support systems and development capabilities. The acquisition of techniques that would enable maximization of production efficiency and minimization of the gap between planning and execution would increase the competitiveness of small- and middle-sized Korean shipyards. In this paper, research on a simulation-based support system for ship production management, which can be applied to the shipbuilding processes of middle-sized shipbuilding companies, is presented. The simulation research includes layout optimization, load balancing, work stage operation planning, block logistics, and integrated material management. Each item is integrated into a network system with a value chain that includes all shipbuilding processes.

• 한국멀티미디어학회논문지
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• 제15권12호
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• pp.1506-1516
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• 2012

In a ship block logistics application, acquisition of locations is required in order to identify location of the ship blocks. A Smart device equipped with a GPS sensor can be used as a mobile client for a ship block logistics application. However the precision of GPS components on a commercial smart device is not high enough. Therefore, using the GPS for localization may produce significant positioning errors in a ship block logistics system. This paper proposes a method to reduce errors in measuring locations using a smart device. Based on the knowledge of how the location information is used in a ship block logistics application, and the predictability of the client's moving line based on geographical layout of a shipyard area, our proposed technique enables a better prediction of the ship blocks location. Performance evaluation shows that the proposed technique can significantly reduce the positional error.

• Journal of Ship and Ocean Technology
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• 제9권2호
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• pp.1-10
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• 2005

A light-weight cantilever type towing carriage was devised and installed in the towing tank at Seoul National University. Wireless measurement devices were also provided for appropriate data acquisition during high-speed towing tests. With the new carriage system, a series of model tests were performed to investigate the hydrodynamic characteristics of the racing boat in the towing tank and the resistance test results had sufficient accuracy so that they could be used in the development of a high speed planning hull.

• 해양환경안전학회지
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• 제20권1호
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• pp.113-119
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• 2014

우리 해군은 함정 제품모델(Naval Ship Product Model, NSPM)을 중심으로 하는 협업 제품개발 환경 구축을 통해 설계 데이터의 재사용성과 M&S의 활용도를 높이고 있다. 그 결과 설계결과의 신뢰성이 높아지고 있으며, 이를 활용한 운영, 건조 시뮬레이션을 통해 소요군의 요구사항이 면밀히 반영되도록 하는 연구도 진행 중에 있다. 이에 따라 설계 데이터의 DB 구축 및 그 품질에 대한 중요성이 부각되고 있으나, 그와 관련된 연구는 초기상태에 머물러 있는 실정이다. 본 연구에서는 저자들의 선행연구 결과인 함정 제품모델의 품질검증 방법론에 기초하여 함정 제품모델을 구성하고 있는 형상요소의 구체적인 품질검증 방안과 이를 자동화하기 위한 연구를 수행하였다. 함정 제품모델 데이터 중 상대적으로 중요하며, 검증과정에 많은 시간이 소요되고 있는 선각모델을 사례연구 대상으로 정의하였으며, 자동차산업에서 사용되고 있는 제품데이터품질(Product Data Quality, PDQ)을 형상검증 기준으로 활용하였다. 최종적으로 선각모델의 형상 품질검증을 위한 기준과 알고리즘을 제안하였으며 이에 기반 한 초기 시스템을 개발하였다.

• 한국산학기술학회논문지
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• 제20권3호
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• pp.91-99
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• 2019

함정은 일반성능, 특수성능, 탑재장비 성능과 관련된 수많은 요구사항이 있으며, 장기간에 걸친 설계 및 건조기간 동안 요구사항은 각 시스템에 반영되고 구현되어야 한다. 요구사항은 설계기간 동안 작성되는 도면, 보고서, 제안요청서, 사양서 등 다양한 문서들을 통해 구체화 된다. 그러나 함정과 같은 복합시스템의 경우 이런 산출물을 통해 요구사항 추적성을 유지하며 요구사항을 관리하는 것에 많은 어려움이 따른다. 함정의 설계 및 건조기술은 오랜 역사 속에 발전되어 왔기 때문에 기존의 문서기반 설계 방식에 익숙하지만, 각종 설계 산출물과 요구사항, 그리고 시스템의 기능, 물리 아키텍처 간 추적성 관리는 어려움이 있다. 함정의 기본설계는 함정 제원 및 성능, 탑재장비 선정 및 배치, 연동 등을 확정하는 중요한 단계이며 시스템 아키텍처 설계 구현을 위한 구체적인 적용 방법 연구를 통해 변화가 요구된다. 따라서 함정 기본설계 단계에 적합한 요구사항 설계 적용을 위한 시스템 아키텍처 설계 방법 연구가 필요하다. 본 논문에서는 요구사항으로 부터 시스템 아키텍처 설계를 수행하고 SE 기반 기술검토 프로세스를 통해 확인하는 방법을 연구하였다. 잠수함 시스템 아키텍처 설계를 위해 요구사항 분석, 아키텍처 설계, 설계 실행 및 통합의 각 단계별 세부 수행사항과 내용을 제시하였다. 이를 통해 효과적인 시스템 요구사항 개발 및 아키텍처 설계가 가능하였으며, 단계별 추적성 관리, 요구사항의 확인 측면에서 효과적임을 확인하였다. 향후 잠수함을 비롯한 다양한 함정에 제시한 프로세스 적용이 가능할 것으로 판단된다.

• 한국해양공학회지
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• 제30권1호
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• pp.57-67
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• 2016

As a new technical approach, an attempt was made to realize a photovoltaic system for an eco-environmental leisure ship by simultaneously actuating nine photovoltaic solar panels in association with the application of a sail-controlling system using wind energy. In this approach, the photovoltaic system consisted of a solar module, an inverter, a battery, and the relevant components, while the sail-controlling device was equipped with sail up/down and mast turning systems. The previously mentioned eco-environmental leisure ship utilizes a photovoltaic hybrid system that uses solar and wind energy as renewable energy sources. Furthermore, this research included a performance evaluation of the manufactured prototype, the acquisition of the purposed quantity values, and development of the purposed items. The significant items, including the sail up/down speed (seconds) and mast turning angle (degrees) were evaluated for a performance test. A wind direction sensitivity of 90% and maximum instant charging power of 900 W were also obtained in the process of the performance evaluation. In addition, the maximum sail time was also evaluated in order to acquire the optimum value. The performance evaluation showed that the prototype with a photovoltaic hybrid system was suitable for sailing an eco-environmental leisure ship using solar and wind energy.

• 대한조선학회논문집
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• 제31권2호
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• pp.22-28
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• 1994

본 연구에서는 개인용 컴퓨터와 신호변환기를 사용한 데이터 취득 및 분석 시스템을 개발하였다. 선박의 속력시운전시 계측되는 축마력, 축회전수, 선속등의 데이터는 여러가지 요인에 의해 변동폭이 크기 때문에 시운전이 수행되는 동안의 어느 한 순간의 값을 대표값으로 할 수가 없다. 변동폭이 큰 데이터의 대표값을 얻기 위하여 본 고에서는 이동평균 개념을 도입하였으며 이동평균값이 변하는 추이도 실시간 그래프로 보여준다. 현재는 8 채널 데이터를 동시에 처리할 수 있고, 분석된 데이터의 저장 및 프린트도 가능하다. 프로그램은 윈도우 환경에서 개발되어 사용자의 편리를 도모하고 향후의 확장이 쉽도록 하였다. 개발된 시스템은 속력시운전 뿐만 아니라 다른 분야-선박의 조종시험시 주요 데이터의 변하는 추이를 기록, 엔진의 헌팅문제의 검사, 진동의 스펙트럼 분석 등-에도 유용하며 이들 분야에 대한 실선에서의 적용 예를 보였다.