• Journal of Advanced Marine Engineering and Technology
• /
• 제28권2호
• /
• pp.269-276
• /
• 2004

A marine diesel engine should realize optimal efficiency operation while reducing NOx. Fuel injection systems by electronic control can become effective means for that. Although it would be able to get more precise engine control compared to the mechanical injection system, it needs some accurate and instant information in order to bring its ability into full play while sailing on the sea. Very important information of them is shaft torque and continuous combustion pressure of all cylinders. The system presented in this report can deliver those data.

• Journal of Advanced Marine Engineering and Technology
• /
• 제38권5호
• /
• pp.573-580
• /
• 2014

The electrical reliability of the power generation and distribution system of Floating Liquefied Natural Gas vessels has been analyzed according to the operating modes using Electrical Transient Analysis Program in this paper. Electricity is used for the topside processes, cargo pumps for off-loading, thrusters for heading control and marine equipment. It is very important to improve the safety, efficiency, and stability of the electrical power system for successful operation. The voltage variation of the high and the low voltage bus shall be within the primitive limitation range at normal operation loads both in steady state and in the transient state. The power system was simulated and compared with class rule for design verification.

• 해양환경안전학회지
• /
• 제4권2호
• /
• pp.35-42
• /
• 1998

Marine casuality causes not only loss of lives and ships, but also severs damages to marine environment and related economic activities such as fishing industry, sea farming, and tourist industry. Basically, the great effort should be made to prevent the occurrence of maritime accidents by any means. However, once accident has occurred, the salvage works should be done rapidly and properly based on theoretical and technical informations, which could minimize the risk during salvage operation and the overall damage from the maritime accidents. Generally, to calculate accurate hydrostatics of a stranded ship, a large amount of input data is needed. But, an availability and a reliability of input data cannot be guaranteed in most situations, and the adequate time required for preparing all input data is not allowed to perform the timely operations of salvage. In this paper, the development process of simple computer program for salvage operation using limited input data is introduced and its application example is presented. This program was developed to provide technical support for planning salvage operations in the grounding accident.

• 수산해양교육연구
• /
• 제23권4호
• /
• pp.723-733
• /
• 2011

On the general fishing boat in the same person of the fishing Chief and the Captain, the fishing chief positions are not separately. In this case, in Civil, Criminal and Administrative law, does not cause any problems. Just he take only responsibility for the legal effect of each, this is a natural solution for the effects of laws. But, if make one work unit, the fishing chief take fishing work from the position of the dominant of the captain, and moreover throughout the voyage work commands the captain. Such fishing chief center structure have roots institutive. In the case, according to legal liability by presenting solutions to the problem are as follows : firstly, The legal division Of the Sailing courses and operation course are necessary. Secondly, In the adminstrative ship official law, obligatory acquisition of the fishing Chief marine engineer qualification is necessary.

• International Journal of Naval Architecture and Ocean Engineering
• /
• 제12권1호
• /
• pp.129-145
• /
• 2020

The article presents a systematic approach to design of marine navigation channels parameters resulting from manoeuvring and operational safety. Relations between the parameters of waterway system elements and the conditions of safe ship operation have been determined and the objective function of waterway parameters' optimization problems has been minimized with respect to variables of construction and operation costs. These costs have been functionally associated to variables of channel width at the bottom and fairway depth. The method of fairway's width computation at specified safe depth at the preliminary and detailed stages of waterway design has been proposed. The results of this method application have been illustrated with two examples: 1. The modernization of Szczecin-Swinoujscie fairway aimed at accepting vessels of 60,000 DWT capacity. 2. Construction of an approach channel leading to a newly built container terminal in Swinoujscie harbour (Poland), handling ocean-going container ships of 20,000 TEU capacity.

• 대한지리학회지
• /
• 제38권1호
• /
• pp.104-126
• /
• 2003

본 연구는 농협 농산물 물류센터의 상적, 물적 유통체계를 파악하고, 물류의 효율성과 집약화를 위해 설립된 청주 물류센터의 계절별 농$.$축$.$수산물의 입하지를 고찰하고자 한다. 그리고 각 상품의 판매액에 의한 배송의 지역유형과 지역특성과의 관계를 밝히는 것을 연구목적으로 한다. 그 결과 청주 물류센터는 충북을 핵심지역으로 전국에서 농$.$축$.$수산물을 입하하여 충북과 충남, 대전시 일부 지역에 배송을 집중화시키고 있다. 이는 청주 물류센터가 취급하고 있는 농$.$축$.$수산물이 신선도를 요하는 상품이기 때문에 물류센터에서 상대적으로 가까운 지역에서 주로 입하하여 근거리 배송을 하는 지역 물류시스템을 형성하고 있다는 것이다. 이러한 농$.$축$.$수산물의 배송은 수급관계라는 경제원칙뿐만 아니라 물류센터의 판매전략도 크게 작용하고 있다.

• 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.

• 해양환경안전학회지
• /
• 제18권4호
• /
• pp.336-344
• /
• 2012

해양에서 발생하는 사고는 선박, 선원 및 해운기업뿐만 아니라 사회 전반에도 매우 큰 영향을 미치며, 따라서 해양사고가 발생하였을 경우, 이를 신속하고 효율적으로 구난하는 것은 매우 중요하다. 특히, 대규모 해양오염이나 인명사고를 수반하는 해양사고는 매우 심각한 피해를 발생시킬 수 있기 때문에 해양사고를 당한 인명, 선박 및 재산을 효율적이고, 신속하게 구난하는 것은 특히 중요하다. 그러나 국내의 해양구난을 위한 역량은 매우 빈약한 상황이며, 비교적 좋은 장비 등을 갖추고 있는 해양경찰 또는 해군 등 공공부문과는 달리 민간구난업은 매우 열악한 기술적 및 경제적 상황에 처해 있다. 해양구난은 단순히 경제적 측면의 중요성뿐만 아니라 국가 안보적 측면에서의 중요성도 있기 때문에 이를 활성화하는 것은 매우 중요한 문제이다. 이에 본고에서 해양구난을 활성화하기 위한 방안을 법제도적 측면에서 검토하고 관련 개선방안을 제시하고자 한다. 개선안은 민간 및 공공부문을 포함한 전체적 활성화 방안과 민간부문의 활성화 방안을 제시하였다.

• 해양환경안전학회지
• /
• 제18권6호
• /
• pp.604-609
• /
• 2012

우리나라는 대규모 유류오염사고가 발생한 경우 방제자원이 충분하지 않아 방제에 어려움을 겪었으며, 또한 방제에 동원된 어선이 효과적인 방제를 수행하지 못해 작업비용이 거부되는 사례도 이전 사고에서 경험하였다. 이에 대규모 유류오염사고 등을 대비하여 방제자원을 사전에 확보하고 또한 유류오염으로 인하여 많은 피해를 입게 되는 오염지역의 어선을 효율적으로 활용할 수 있는 방안의 일환으로 소형 선박에 장착하여 기름을 회수할 수 있는 효율적 장비를 개발하고 이를 정책화하는 것이 중요한 대안이 될 수 있다. 이를 위해, 본 연구에서 국내 실정에 맞는 소형선박 장착용 기름회수장비 개발을 위한 예비 단계로서 이러한 장비의 장착에 적합한 대상 선박의 선정을 위한 연구를 수행하였다.

• Journal of Advanced Marine Engineering and Technology
• /
• 제40권5호
• /
• pp.447-452
• /
• 2016

The use of gas as fuel, particularly liquefied natural gas (LNG), has increased in recent years owing to its lower sulfur and particulate emissions compared to fuel oil or marine diesel oil. LNG is a low temperature, volatile fuel with very low flash point. The major challenges of using LNG are related to fuel bunkering, storing, and handling during ship operation. The main components of an LNG fuel system are the bunkering equipment, fuel tanks, vaporizers/heaters, pressure build-up units (PBUs), and gas controlling units. Low-pressure dual-fuel (DF) engines are predominant in small LNG-powered vessels and have been operating in many small- and medium-sized ferries or LNG-fueled generators.(Tamura, K., 2010; Esoy, V., 2011[1][2]) Small ships sailing at coast or offshore rarely have continuous operation at constant engine load in contrast to large ships sailing in the ocean. This is because ship operators need to change the engine load frequently due to various obstacles and narrow channels. Therefore, controlling the overall system performance of a gas supply system during transient operations and decision of bunkering time under a very poor infrastructure condition is crucial. In this study, we analyzed the fuel consumption, the system stability, and the dynamic characteristics in supplying fuel gas for operating conditions with frequent engine load changes using a commercial analysis program. For the model ship, we selected the 'Econuri', Asia's first LNG-powered vessel, which is now in operation at Incheon Port of South Korea.