• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2006년 창립20주년기념 정기학술대회 및 국제워크샵
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• pp.281-284
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• 2006

After building a ship in a shipyard, there are so many repeated inspection of welding seam defects and painting status before delivering to the ship's owner. An inspection on the bottom part of a ship in commercial service should be done in every two years for the purpose of safety and for the prevention of ship speed deterioration. conventional welding seam inspection systems are rely on the visual inspection by human or the ultrasonic inspection for the selective part of a ship. This paper suggests a remote controlled inspection system for the examination of large ships or steel structures. The proposed system moves in contact with the ship under inspection and have a CCD camera to provide visual-guidance information to a remotely located human worker. Additionally this system utilizes a weld line tracking algorithm for an optimal position control. We verified the effectiveness of the inspection system by experimental data.

• 재무관리연구
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• 제11권1호
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• pp.263-284
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• 1994

This study examines the monitoring effects of institutions, outside directors, and outside blockholders by seeing managers' selection of antitakeover measures. In this paper, we hypothesize that managers use antitakeover techniques to entrench themselves when they are not monitored closely. Consequently, we hypothesize that institutional ownership, outside membership on board of directors, outside directors ownership, and outside blockholder ownership are less in firms which adopt harmful antitakeover measures. This paper analyzes whether the degree of monitoring by institutions, outside directors, and outside blockholders influences managers' adoption of different types of takeover defenses. We find interesting empirical results. First, aggregate institutional ownership is positively correlated with the likelihood of antitakeover techniques adoption. This result implies that institutional investors are passive. Second, total and active blockholder owner-ship is higher at firms that do not propose any defensive tactics. passive blockholder owner-ship is highest at fair price firms but low at poison pills firms. Ownership concentration by outside investors increases monitoring and reduces agency problems. Thirid, outside board monitoring is ineffective.

• 한국항해학회지
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• 제15권4호
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• pp.1-11
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• 1991

Since it is very important for an ocean-going vessel to transmit information quickly and accurately to her owner or charterer not only for the ship's safety but for economic operation of the ship, some newly-built automated vessels equipped with automatic information transmission system which consists of INMARSAT-C and specially-designed computer. This system, however, is not applicable to the existing vessel without chaging her equipments and, furthermore, is too expensive for small shipping companies to fit out such a system on their vessels. Therefore, we propose a low-priced information transmission system which consists of a personal computer and communication equipments in the existing vessel, and in this paper, as the groundwork of the proposed system, we have made up the ship's position transmission system which is composed of and IBM AT-compatible, PC, INMARSAT-A and a GPS receiver. As the test result of the system through sea trial on the training ship 'HANBADA', we confirmed that transmission of the ship's position was achieved succesfully and consequently there could be high possibility of cost-effectiveness of the proposed system.

• International Journal of Naval Architecture and Ocean Engineering
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• 제3권3호
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• pp.181-192
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• 2011

Recently, the speed of change related with enterprise management is getting faster than ever owing to the competition among companies, technique diffusion, shortening of product lifecycle, excessive supply of market. For the example, the compliance condition (such as delivery date, product quality, etc.) from the ship owner is getting complicated and the needs for the new product such as FPSO, FSRU are coming to fore. This paradigm shift emphasize the rapid response rather than the competitive price, flexibility and agility rather than effective and optimal perspective for the domestic shipbuilding company. So, domestic shipbuilding companies have to secure agile and flexible ship production environment that could respond change of market and requirements of customers in order to continue a competitive edge in the world market. In this paper, I'm going to define a standard shipbuilding production management system by investigating the environment of domestic major shipbuilding companies. Also, I'm going to propose a unified ship production management and system for the operation of unified management through detail analysis of the activities and the data flow of ship production management. And, the system functions for the strategic approach of ship production management are investigated through the business administration tools such as performance pyramid, VDT and BSC. Lastly, the research of applying strategic KPI to the digital shipyard as virtual execution platform is conducted.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2005년도 후기학술대회논문집
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• pp.73-74
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• 2005

Shipping company and operators have to manage well to keep shipping schedules without problems in main engine. Specially operators have to operate main engine within the limit of operation point, and adjust related parameters to be operated safely and continuously. Also operators have ability to analyze fouling condition of hull through comparing data gotten from P-V curve and performance results of new building ships in trial with service ships. In this study, not only compared main engine performance results in shop trial and sea trial, but also investigated performance trend in accordance with the time elapsed for the service ship's diesel engine. They were confirmed as follows. First, shop trial load is higher than sea trial load but ship's speed is satisfied with owner's contract speed. Second as time goes by, load of service ship increases steadily and other parameters related with main engine shows variable change depend on main engine load increasing.

• International Journal of Naval Architecture and Ocean Engineering
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• 제11권1호
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• pp.474-481
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• 2019

The speed trial of a ship is one of the important elements guaranteeing its performance under the contract between the ship owner and shipbuilding company. A speed trial at sea, where the tidal current and waves are suppressed to the maximum, can prevent measurement errors due to external force conditions. On the other hand, it is difficult to maintain a calm sea state in most sea areas determined by the influence of the tidal current, wave, wind, etc. Therefore, this study evaluated a method of simulating a tidal current, which is one of the external force conditions, at the speed test operation of a ship, and applied the simulation result to the plan of a speed trial.

• 대한조선학회논문집
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• 제46권3호
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• pp.325-334
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• 2009

Generally, functional design of FPSO has been done by the engineering firm designated by ship owner. Main equipment such as topside facility is imported from abroad. But sometimes, OFE (Owner Furnished Equipment) does not satisfy the PND (Product Need Date) of each production stage because the delivery date of OFE is not scheduled to satisfy the PND. And sometimes many loose items and equipment are complex from engineering which does not consider pre-outfitting. Main objective of this study is process improvements by maximizing pre-outfitting rate in the stage of equipping STP (Submerged Turret Production), one of main equipment on FPSO. In this study, we analyzed the factors which obstructed pre-equipping STP using the past records of FPSO projects.

• 한국항해학회지
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• 제17권3호
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• pp.1-14
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• 1993

The master of ship is always authorised to perform whatever acts are ordinarily necessary for the safe and proper prosecution of the voayge with regard to both ship and cargo. In other words, when a ship is away from her home port, where her business was managed, the master generally carried the owner's authority, and ordinarily he had power to enter into engagements, on their behalf, for carrying goods in the ship, or for letting her service, provided those engagements were consistent with the usual manner of employing her adopted by the owners. Accordingly he has always to decide onboard for an adequate applying of statutory law and cases whenever he acts. But the master would appear to have no such autho-rity where he can communicate with the owners without difficulty as, now-a-days, he nearly always can. This paper, therefore, intend to review some guidance of his authority in accordance with the Korean Code of Commerce as well as precedent based on it. The paper is also simply to place at the disposal of young shipmasters and those who aspire to command some legal information concerning limit of master's authority away from vessel's home port through legal commentation on the precedent, which may assist them to a better understanding of the many problems they may be faced with in the course of their ca-reers. In order to make an efficient study of legal structure concerned for shipmaster's authority, several up-to-date precedents are selected and described herein by writer's opinion for preventing unreasonable legal dispute in this field before courts in future.

• 대한조선학회논문집
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• 제59권6호
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• pp.393-399
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• 2022

During the ship hull design process, resistance performance estimation is generally calculated by simulation using computational fluid dynamics. Since such hull resistance performance simulation requires a lot of time and computation resources, the time taken for simulation is reduced by CPU clusters having more than tens of cores in order to complete the hull design within the required deadline of the ship owner. In this paper, we propose a method for estimating resistance performance of ship hull by simulation using a graph neural network. This method converts the 3D geometric information of the hull mesh and the physical quantity of the surface into a mathematical graph, and is implemented as a deep learning model that predicts the future simulation state from the input state. The method proposed in the resistance performance experiment of simple hull showed an average error of about 3.5 % throughout the simulation.

• 한국항해항만학회지
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• 제44권4호
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• pp.354-361
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• 2020

"선용품" 이라는 용어는 일반적으로 선박에서 사용되는 모든 관련 기계적 부속품과 소모성 자재를 통칭하는 용어이다. 선박은 원양을 운항하기에 긴급 상황에서 선용품에 대한 수요가 발생할 경우 긴밀하게 대응하기가 쉽지 않다. 특히, 부정기선의 경우 더욱 선용품의 보급계획을 예측하기 어려우므로 적정 보급지를 결정하는 것은 어려운 일이다. 본 연구는 각 선주사 및 선박관리업체를 대상으로 한 설문 조사를 통해 부정기선박의 보급지 결정 시 고려되는 요소와 중요도를 파악하였다. 이를 통해 각 국가별, 항만별 공급절차를 제시하였고, 이를 통해 효율적인 선용품 보급 물류 방식을 제안하였다.