• Journal of Navigation and Port Research
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• v.28 no.5
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• pp.435-441
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• 2004

This paper deals with modelling and identification of a shipboard stabilized satellite antenna system using the optimal neural network structure. It is difficult for shipboard satellite antenna system to control and identification because of their approximating ability of nonlinear function So it is important to design the neural network with optimal structure for minimum error and fast response time. In this paper, a neural network structure using genetic algorithm is optimized And genetic algorithm is also used for identifying a shipboard satellite antenna system It is noticed that the optimal neural network structure actually describes the real movement of ship well. Through practical test, the optimal neural network structure is shown to be effective for modelling the shipboard satellite antenna system.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.1
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• pp.101-109
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• 2013

e-Navigation requires shipboard integrated information system to manage several kinds of data on shipboard. IEC 61162-450 may be adopted for the development of such system. Based on IEC 61162-450, this paper proposes an architecture of shipboard integrated information system, and describes a developed system. The system is composed of NMEA 2000 gateway, wireless sensor gateway, database, monitoring applications. This paper also shows the feasibility of the system through some tests.

• Journal of the Korean Institute of Navigation
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• v.22 no.1
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• pp.91-106
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• 1998

Traditionally, in the education for the trainees of marine officier, the emphasis is laid on the practical training on board to prepare them for the future position on board and to fit them for the shipboard life. Though the education has been carried out in various ways according to each country's social tradition, culture and educational system, in these days it is done normally by the combined way of school education and training on board to get the competence for the marine officer. Thus the shipboard training course is compulsively required to the candidates for certification as merchant marine officers by the IMO STCW convention 1978 and also it is believed that the education for the dacet officers is to be completed through the shipboard training. In spite of the various earlier studies to improve the training education system, there are few studies for the matters and problems form the standing point of cadet.

• Journal of Environmental Science International
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• v.28 no.10
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• pp.899-905
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• 2019

Recently, an innovative method for wastewater treatment and nutrient removal was developed by combining the sequence batch reactor and membrane bioreactor to overcome pollution caused by shipboard sewage. This system is a modified form of the activated sludge process and involves repeated cycles of mixing and aeration. In the present study, the bacterial diversity and dominant microbial community in this wastewater treatment system were studied using the MACROGEN next generation sequencing technique. A high diversity of bacteria was observed in anaerobic and aerobic bioreactors, with approximately 486 species. Microbial diversity and the presence of beneficial species are crucial for an effective biological shipboard wastewater treatment system. The Arcobacter genus was dominant in the anaerobic tank, which mainly contained Arcobacter lanthieri (8.24%), followed by Acinetobacter jahnsonii (5.81%). However, the dominant bacterial species in the aerobic bioreactor were Terrimonas lutea (7.24%) and Rubrivivax gelatinosus (4.95%).

• Convergence Security Journal
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• v.20 no.2
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• pp.123-135
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• 2020

Since AlphaGo's Match in 2016, there has been a growing calls for artificial intelligence applications in various industries, and research related to it has been actively conducted. The same is true in the military field, and since there has been no weapon system with artificial intelligence so far, effort to implement it are posing a challenge. Meanwhile, AlphaGo Zero, which beat AlphaGo, showed that artificial intelligence's self-training data-based approach can lead to better results than the knowledge-based approach by humans. Taking this point into consideration, this paper proposes to apply Reinforcement Learning, which is the basis of AlphaGo Zero, to the Shipboard Combat System or Combat Management System. This is how an artificial intelligence application to the Shipboard Combat System or Combat Management System that allows the optimal tactical assist with a constant win rate to be recommended to the user, that is, the commanding officer and operation personnel. To this end, the definition of the combat performance of the system, the design plan for the Shipboard Combat System, the mapping with the real system, and the training system are presented to smoothly apply the current operations.

• Journal of Aerospace System Engineering
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• v.8 no.3
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• pp.14-19
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• 2014

When a helicopter lands on a ship deck in high sea states, one of main difficulties is the ship motion by sea wave, In case of a manned helicopter, a pilot lands a helicopter on the deck during quiescent period of ship motion, which is perceived from different visual cues around landing spot. The capability to predict this quiescent period is very important especially for shipboard recovery of VTOL UAV in harsh environments. This paper describes how to predict heave motion of a ship for shipboard landing of a VTOL UAV. For simulation, ship motion by sea wave was generated using a 4,000 ton class US destroyer model. Heave motion of ship deck was predicted by applying auto-regression method to generated time series data of ship motion.

• Journal of the Korean Society of Marine Environment & Safety
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• v.4 no.1
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• pp.41-48
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• 1998

There are several serious problems in treating shipboard wastewater due to special environmental conditions of ship, such as confined space, rolling and pitching, change of temperature and so on. It was suggested that Sequence Batch Reator (SBR) process might be suitable for overcoming above problems in terms of small size, high capacity of treating wastewater and full automation. In this study the SBR process was used for the secondary treatment of shipboard wastewater. The average removal efficiency of DOC, nitrogen, phosphorus and surfactants(MBAS) were studied and the effects of various C/N ration on the efficiency of treatment were investgated. From the experimental results it was convinced that the SBR process would be able to be used as a suitable process for removing organic matters and nitrogen in reuse system of shipboard wastewater.

• Journal of Multimedia Information System
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• v.3 no.3
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• pp.77-84
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• 2016

The sailors on seagoing ships experience much difficulty in communicating with their families, friends or associates ashore due to communication cost or technical difficulties so that they are sometimes unable to adapt to the rapid social changes promptly. This is mainly the result of an insufficient Information and Communication Technology (ICT)-environment on their ships. To surmount such a problem, an electronic shipboard voting system that guarantees the publicness and absolute secrecy in voting process has been proposed in this paper. The system not only helps crews to catch up with up-to-date news and provides them a feeling that they are being connected to the everyday lives of the outside world, but also allows them to cast their votes based on the newly acquired information (e.g., current political or economic situations in their respective regions and etc.).

• Nuclear Engineering and Technology
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• v.55 no.11
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• pp.4077-4082
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• 2023

Large areas must be rapidly screened to monitor radiation in marine environments. For this purpose, this study developed a mobile real-time gamma-ray measurement system for shipboard use and evaluated its performance. The system was developed to measure engine or generator cooling water by installing a canister inside the ship. The minimum detectable activity of the system is about 0.8 Bq/L for a 60 s measurement period, and real-time data transmission and remote control are possible. The system was tested in the field and is currently being installed and operated on ships in service. Such a ship-based real-time gamma-radiation measurement system is suitable for a wide range of marine radiation surveillance applications and is expected to be rapidly deployed.

• Journal of the Korean Society for Marine Environment & Energy
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• v.12 no.3
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• pp.209-216
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• 2009

IMO has established International Convention for the Control and Management of Ships' Ballast Water and Sediment 2004 in February 2004 in order to prevent transfer of aquatic organisms through ballast water. According to the Convention, Each countries are preparing ratification and legislation process and encouraging the development of treatment system to satisfy the performance standard in the Convention. This Electro-$Cleen^{TM}$ treatment system was granted IMO basic approval in March 2006, and final approval in October 2008. The Type Approval Certificate was issued in December 2008 by the Government of Republic of Korea. This paper considers the matter of principle mechanism, overview of the system, installation on shipboard and shipboard test results for the Electro-$Cleen^{TM}$. Shipboard tests with the 8300 GT M/V Yokohama and 27,000 DWT M/V Greenwing have already been conducted. These tests confirmed that the Electro-$Cleen^{TM}$ system satisfies all of the IMO standards and is suitable for installation in new and existing ships.