• Ocean and Polar Research
• /
• 제37권3호
• /
• pp.235-247
• /
• 2015

The main purpose of procuring the oceanographic research vessel with state-of-the-art technology is to provide a floating laboratory to conduct field work on the global oceans. The vessel should be properly utilized to locate and evaluate unexplored natural resources as well as to contribute international efforts to better understand and manage global environmental issues. Top priorities in the vessel design are high safety standards, noise and vibration control efficiency, and effective application of research equipment. For the accomplishment of all activities, the vessel length over all should be extended ~100 m with a gross tonnage of ~5,900 ton. In particular, the dynamic positioning system II will essentially operate at sea state 6. The high efficiency emissions reduction system will also be adopted in preparation for entry into force of 3rd exhaust emission control (Tier III). About 130 navigational and scientific instruments will be installed. The final design and model test of the new research vessel were reviewed and completed, respectively, in 2014. Currently, the ship is being built on schedule and expected to be delivered in December 2015. Within the near future, the new vessel will assume the role of carrying out multidisciplinary oceanographic researches of the highest standards in a technologically advanced and environment friendly manner.

• 한국항만경제학회지
• /
• 제22권2호
• /
• pp.83-108
• /
• 2006

Regarding the ocean carrier's responsibility for damage indemnification, both his or her duty of care and reason of legal exemption have been considered important. The International Convention for the Unification of Certain Rules relating to Bills of Lading also provides that the ocean carrier indemnifies for the loss or damage of freight on the basis of the principle of liability with fault. In other words, the carrier assumes responsibility only for the loss or damage of freight which is under his or her control and whose safety must be carefully maintained by him or her. The carrier's duty of care which is required for freight safety in accordance with the convention is associated with two themes, seaworthiness of vessel and freight itself. To make ocean freight shipping effective necessities the seaworthiness of the ship that will conduct the shipping service under its responsibility. This will ultimately lead to making the service impressive to the shipper as freight owner. Thus the purpose of this study is to contribute to more reasonable shipping by the shipowner or the carrier who needs to ensure seaworthiness of vessel, and prevent unseaworthiness that may be incurred in accordance with freight characteristics. For the purpose, this paper reviewed the meaning of seaworthiness of vessel through a juridical approach to its causal relationship with ocean freight shipping.

• 해양환경안전학회:학술대회논문집
• /
• 해양환경안전학회 2006년도 추계학술발표회
• /
• pp.299-301
• /
• 2006

해상에서 인명과 재산을 보호하기 위하여 해양사고를 예방하고 사고발생 시에 신속하게 대처하는 능력이 중요시된다. RFID 기술을 적용하면 선박에서 선원들의 이동경로와 출입을 통제함으로써 안전사고를 미리 방지하는 것은 물론 선박의 안정성을 크게 높일 수 있다. 이에 적용된 RFID 기술은 현재 물류유통 분야에서 많이 이용되고 있는 RFID KS 국내표준인 $860MHz{\sim}960MHz$ 대역을 이용하여 선원이 RFID 태그를 소지하여 입출항과 동선을 파악하여 안전사고를 미리 방지하는 효과를 가져 올 수 있다.

• Nuclear Engineering and Technology
• /
• 제51권6호
• /
• pp.1658-1668
• /
• 2019

Nuclear power generates a large portion of the energy used today and plays an important role in energy development. To ensure safe nuclear power generation, it is essential to conduct an accurate analysis of reactor structural integrity. Accordingly, in this study, a methodology for obtaining accurate structural responses to the combined seismic and reactor coolant loads existing prior to the shutdown of a nuclear reactor is proposed. By applying the proposed analysis method to the reactor vessel internals, it is possible to derive the seismic responses considering the influence of the hydraulic loads present during operation for the first time. The validity of the proposed methodology is confirmed in this research by using the finite element method to conduct seismic and hydraulic load analyses of the advanced APR1400 1400 MWe power reactor, one of the commercial reactors. The structural responses to the combined applied loads are obtained using displacement-based and stress-based superposition methods. The safety of the subject nuclear reactor is then confirmed by analyzing the design margin according to the American Society for Mechanical Engineers (ASME) evaluation criteria, demonstrating the promise of the proposed analysis method.

• Nuclear Engineering and Technology
• /
• 제47권3호
• /
• pp.240-252
• /
• 2015

In the original licensing application for the prototype fast-breeder reactor, MONJU, the event progression during an unprotected loss of flow (ULOF), which is one of the technically inconceivable events postulated beyond design basis, was evaluated. Through this evaluation, it was confirmed that radiological consequences could be suitably limited even if mechanical energy was released. Following the Fukushima-Daiichi accident, a new nuclear safety regulation has become effective in Japan. The conformity of MONJU to this new regulation should hence be investigated. The objectives of the present study are to conduct a preliminary evaluation of ULOF for MONJU, reflecting the knowledge obtained after the original licensing application through CABRI experiments and EAGLE projects, and to gain the prospect of in-vessel retention for the conformity of MONJU to the new regulation. The preliminary evaluation in the present study showed that no significant mechanical energy release would take place, and that thermal failure of the reactor vessel could be avoided by the stable cooling of disrupted-core materials. This result suggests that the prospect of in-vessel retention against ULOF, which lies within the bounds of the original licensing evaluation and conforms to the new nuclear safety regulation, will be gained.

• 한국산업융합학회 논문집
• /
• 제24권5호
• /
• pp.625-633
• /
• 2021

This paper considers the development of safety operation guideline for onboard A-Frame system used to operate heavy-work ROV using dynamic simulation. Onboard A-Frame is affected by ship's behavior and large inertia by the marine environment. For this reason, safety operation guidelines are required for the safety of workers who operate ship-mounted equipment. In order to develop a guideline, it is necessary to evaluate the safety loads through real sea experiment. However, simulation method is used instead since it is difficult to conduct experiments in sea. Therefore, a procedure for safety operation analysis based on dynamic simulation that can consider ship behavior and marine environment and a safety operation table were proposed in this study. And the construction of safety operation table and guide for safety operation using the applied load and safety factor analysis results were considered.

• 한국자기학회지
• /
• 제24권4호
• /
• pp.128-133
• /
• 2014

강자성체로 이루어진 함정 선체의 자화에 의해 발생되는 자기장을 제어 및 최소화하는 것은 어뢰 및 기뢰로부터 함정의 생존성을 확보하기 위해 매우 중요한 일이다. 함정으로부터 발생하는 영구자기장 및 유도자기장은 각각 자기처리(탈자)와 소자의 방법으로 최소화 한다. 여러 각국의 해군들은 기뢰의 위협으로부터 함정을 안전하게 보호하기 위해 여러가지 대책들을 수립하여 엄격히 통제하고 있으며, 함정의 자기 정숙화와 관련한 독자적인 자기처리시설을 구축하여 운용하고 있다. 국내의 경우, LIG넥스원에서 신규 자기처리시설을 국내 개발하여 현재 전력화 완료 후 운용 중에 있다.

• 해양환경안전학회지
• /
• 제28권2호
• /
• pp.314-323
• /
• 2022

선박교통관제사는 선박 교통의 안전과 효율을 도모하기 위하여 선박교통관제 설비로 지정된 시스템 및 센서 장비를 활용하여 선박교통관제 업무를 수행한다. 선박교통관제의 효과적 운영을 위한 관제 필요 정보는 지정된 선박교통관제 설비 이외의 부가적인 정보 창구의 접근이 요구되며, 이러한 다양한 정보 열람 창구를 일원화하기 위하여 선박교통관제 클라우드 시스템 개발이 진행 중이다. 본 연구에서는 선박교통관제 클라우드 시스템 도입에 따른 사용자 필요 정보 식별을 위하여 선박교통관제 업무 분석 및 운영 정보와 선박교통관제 설비 연계 분석을 수행하였다. 국내외 문헌 검토와 전문가 인터뷰를 통하여 선박교통관제 업무 분석을 수행하였으며, 선박교통관제 설비에 따른 필요 정보를 식별·연계하였다. 분석 결과 전체 내·외부 정보 창구의 필요 정보는 37개의 범주로 식별되었으며, 필수 및 보조관제 설비 이외 열람이 필요한 추가 요구 정보는 8개의 정보창구를 통하여 수집 가능한 것으로 확인되었다. 본 연구를 통하여 식별한 사용자 요구사항은 선박교통관제 클라우드 시스템 구축을 위한 데이터 수집·처리 구조 설계에 적용될 것이다. 향후 시나리오 기반 관제 시스템 사용자 운영 분석을 통하여 사용자 요구 및 필요 정보를 개정·보완하고, 시스템 인터페이스 디자인 설계에 관한 추가 연구가 필요하다.

• 해양환경안전학회:학술대회논문집
• /
• 해양환경안전학회 2006년도 추계학술발표회
• /
• pp.303-308
• /
• 2006

이 연구의 목적은 부산항에 입항하는 대형 콘테이너 선박의 안전 접안 조종을 위한 한계풍속을 설정하는데 있다. 계산결과, 정상풍속 13.5m/sec 이하의 바람에서는 예선 4500H.P.의 Z. peller 2척을 이용하여 안전 접안 조선하는데 큰 위험이 없음을 알았다. 그러나 돌풍율 25%를 포함한 강풍 16.9m/sec 이상의 기상상태에서는 선박조종이 위험하게 됨을 알았고, 돌풍율을 포함하여 풍속이 16.9m/sec 에 달하는 강풍하에서 대형 콘테이너 선박을 부득이 접안 조종할 때는 4500 H.P.Z. peller 3척으로 조선보조를 받아야 함을 알았다.

• 한국해양공학회지
• /
• 제24권2호
• /
• pp.25-33
• /
• 2010

Collision between vessels may lead to structural damage and penetration of hulls. The structural damage of a hull may eventually bring about global collapse of the hull girder and outflow of oil, which would contaminate seawater. Therefore, various regulations require the strength of a vessel after collision to satisfy given criteria, and owners usually request collision analyses to confirm the structural safety of their vessels. In the process of designing a vessel to satisfy the collision strength criteria, the strength has been assessed mostly by conducting collision analyses using numerical techniques, such as dynamic, non-linear, finite-element analysis. Design is an inherently iterative process during which many changes are necessary due to the endless needs for reinforcement and modification. Numerical techniques are not adequate for coping with a situation in which collision analysis is frequently required to provide the revised results that reflect the repetitive changes in designs. Numerical techniques require a lot of time and money to conduct in spite of recent improvements in computing power and in the productivity of modeling tools. Therefore, in this paper, an analytical technique is introduced and a collision problem is idealized and simplified using reasonable assumptions based on appropriate background. The technique was applied to an example of an actual FPSO and verified by comparing the results with results from the numerical technique. A good correlation was apparent between the results of the analytical and numerical techniques.