• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2017년도 추계학술발표회
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• pp.203-203
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• 2017

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2017년도 추계학술발표회
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• pp.199-199
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• 2017

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 추계학술대회 논문요약집
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• pp.198-198
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• 2003

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2017년도 추계학술발표회
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• pp.201-201
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• 2017

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2003년도 춘계학술발표회
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• pp.41-58
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• 2003

A recent trend of global shipping industry adopting Port State Control (PSC) system is recognized as a proficient mechanism in preventing costal traffic accident and protecting marine environment. Disadvantages of Korean shipping companies in PSC inspection are unavoidable as Tokyo MOU imposed priority listed flag to Korea. Having stated above, appropriate research and prompt preparation in compliance with current PSC requirements for the Korean shipping companies have become an immediate need. The objectives of this study are : First, to review in understanding of PSC in overall and foundation of enforcement. Second. to study interaction of international treaties regarding PSC. Third, to compare practical compliance among the countries and to open up a case study on Korean shipping companies in adopting PSC. Last, to suggest direction to the Korean shipping companies the most proficient way in compliance with the current Tokyo MOU requirement. Korean flagged vessels have become prioritized target in PSC inspection as Tokyo MOU imposed priority listed flag to Korea due to high detention rate of its fleet. Disadvantage of a priority listed flag is a burden in its proficient fleet operation. This study suggests solutions to the disadvantages as below. : 1) Change shore management system, and provide continuous & quality education to crew members 2) Form a network in sharing PSC information among the Korean shipping companies 3) Form a centralized function in which government, Korean Shipping register and shipowners can treat problems in a prompt manner.

• 한국항만경제학회지
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• 제31권2호
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• pp.23-40
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• 2015

본 연구는 시스템 다이내믹스 기법을 활용하여 주요 해운정책이 우리나라 외항선대 증가에 미치는 영향에 대하여 분석하는 것을 목적으로 하였다. 시뮬레이션을 위해 사용된 변수는 2005년부터 2013년까지 우리나라 해운기업이 보유한 선박척수와 총톤수, BDI, HRCI, CCFI, WS, 달러 대비 환율, 세계 선대규모, 우리나라 해운업계 부채비율 등이고, 해운정책이 외항선대 증가에 어떤 영향을 주는지를 검증하기 위하여 국제선박등록 톤수, 정책금융기관의 해운기업에 대한 대출액수, 톤세제 적용기업의 수, 선박펀드 규모 등 4가지 정책변수에 대해 민감도 분석을 실시하였다. 예측값의 정확도를 파악하기 위해 절대평균 오차비율(MAPE) 검증을 실시하였는데, MAPE 값이 3.46%로서 10%이내에 해당하여 매우 높은 정확도를 가지는 시뮬레이션 모델로 평가되었다. 민감도 분석결과, 국제선박등록 톤수, 정책금융기관의 대출액수, 선박펀드 규모, 톤세제 적용기업의 수의 순으로 영향도가 큰 것으로 분석되었다.

• Selected Papers of The Society of Naval Architects of Korea
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• 제2권1호
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• pp.18-28
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• 1994

In the vibration analysis of submerged or floating bodies such as ships and offshore structures, the coupled system between fluid and structure should be considered using the compatibility conditions on the wetted surface. It is well known that the hydroelastic vibration analysis of structures in contact with fluid can be done by applying the finite element method(FEM) to structures and the boundary element method(BEM) to the fluid domain. However, such an approach is impractical due to the characteristics of the fully coupled added mass matrix of fluid on the entire wetted surface. To overcome this difficulty, an efficient approach based on a reanalysis scheme is proposed in this paper. The proposed method can be applied for cases of higher local modes and beam-like modes for which three-dimensional reduction factors are not known. The three dimensional reduction factors are not needled and thus the restrictions can be removed in the analyses of non-beam like modes or local vibration modes by considering fluid-structure interaction. The validity and calculation efficiency of the proposed method are proved through numerical examples.

• 한국CDE학회논문집
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• 제18권4호
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• pp.267-274
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• 2013

This study focuses on the data schema and data content, which includes maintenance data, data structures and illustration data relevant with the maintenance process of ship and offshore structures. Product lifecycle management (PLM) is expected to encompass all the product data generated for the operation and maintenance information as well as the design and production. This paper introduces a data exchange schema in PLM of ship and offshore, serving as the basis for the role of standards required by the middle-of-life PLM. Also this paper identifies a typology of standards relevant to PLM that addresses the schema of evolving standards and identifies a XML schema supporting the exchange of data related with maintenance operations. Technical document based on standards in accordance with S1000D and Shipdex is explained. A case study illustrating the use of standard data exchange and technical document is presented.

• 동력기계공학회지
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• 제17권2호
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• pp.95-102
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• 2013

For vessels operating in the cold climate regions, the ballast water inside or hopper tanks above the waterline may be frozen, starting at the top of the tank and at the side walls. Therefore, countermeasures against freeze-up of the ballast tank such as air-bubbling system, hot steam injecting system, heating coil system and water circulating system are taken to prevent freeze-up phenomenon; however, there are no rigorous investigations of anti-freezing to examine the effectiveness and validity of systems against freeze-up of the ballast tank, in which the temperatures are about $-25^{\circ}C$ (ambient air temperature) and $0^{\circ}C$ (sea water), respectively. In this paper, to ensure reasonable specifications for cold regions if the measures from the above-mentioned systems against freeze-up are effective, the phenomenon of ballast tank freeze-up is simulated and discussed in low temperature conditions. With the results using the commercial CFD code, CFX 14, the most cost-effective solution is conducted to prevent being frozen along the outer surface.

• 수산해양교육연구
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• 제28권1호
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• pp.34-46
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• 2016

This study analyzes inspection results of ships by Port State Control. Particularly, this research focuses on a detention trend of vessels that registered to Korean Register of Shipping. In order to conduct this research, we have searched 170 ships that got a detention with a Code-30 within recent 46 months period. The deficiencies of the detentions are inspected by ship types, ship years, flags, ports inspected, and criteria. Moreover, we categorized the deficiencies for the detentions into 17 types for internal and external inspections. As the results of the comparison study, bulk and general cargo carriers dominate the portion of detentions by almost 66 percent. Self-induced detention due to a lack of preparation by crews and company support are the main reasons of repeated detentions from the same type ships. Ships between six and ten years old show the lowest detention rate by 4 percent whereas ships less than five years old generate the highest detention rate by 22 percent. The main categories of the detentions from ships less than 5 years old are a lack of documentation and certification, and the clues support our opinion that owners and crews may neglect to prepare the inspections because their strong confidence for the ship condition due to young ship age. As a result of a great effort of Korean government and shipping companies to reduce a detention rate, the detention rate has been recently reduced to 0.3 percent. The results also require companies with the flag of convenience ships to spend more effort to reduce the detention rate, too. We expect that using social networking service by Korea Register will lower the detention rate by sharing relevant information real-time to ships and owners.