• Journal of Korea Ship Safrty Technology Authority
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• s.27
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• pp.53-62
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• 2009

오늘날의 선박은 디지털 선박(Digital-ship)으로 변화하고 있으며, 일부 유비쿼터스(Ubiquitos) 기술을 기반으로 e-Navigation 및 VTS(Vessel Traffic Service) 등 안전 항해 및 편의를 제공하고 있다. 하지만, 아직까지 선박에 대한 안전시스템이 미비하고, 선박의 주요 설비를 실시간으로 관리하기 위한 안전 관리 시스템의 개발이 매우 필요한 시기라 할 수 있다. 지금까지 선박 연구에 있어서 안전을 극대화시키기 위한 노력은 많았으나 선박의 재질(철판) 및 밀폐환경에 의해 무선 통신(Wireless Communication)을 이용한 시스템 개발은 많이 이루어지고 있지 않은 상태이다. 본 논문은 선박 내의 전파 특성을 분석하여 무선 통신을 하기 위한 최적의 조건을 찾고, 유비쿼터스 기술을 적용한 지그비 네트워크 구성으로 선박 내 엔진관리를 위한 무선 센서 네트워크(Wireless Sensor Network)의 적용 가능성을 검증하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.5
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• pp.922-931
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• 2012

This paper studies a series of logical topology reconfiguration processes corresponding to a series of traffic demand changes in a ship backbone network. The proposed reconfiguration technique is to minimize costly changes of traffic forwarding paths and minimize the average hop distance of traffic forwarding paths in terms of ship backbone network performance simultaneously. Performance evaluation is conducted to illustrate the efficiency of the proposed reconfiguration technique. It shows that the proposed reconfiguration technique yields efficient performance in the entire series of reconfiguration processes.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.2
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• pp.351-359
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• 2010

In this paper, we propose a transmission algorithm of the TLI protocol of the IEC 61162-4 standard to perform the e-Navigation on ship, and we design and implement the TLI protocol according to the proposed algorithm. The implemented protocol is a TCP/IP based protocol, and is a network protocol with the MAU and LNA components proposed in the IEC 61162-4 standard. In addition, it makes a data transmission over the network architecture based on client/server network model. In the implemented protocol, there are a communication between the MAU and the LNA in one host, and also a communication between the LNA and the LNA in each other hosts. In order to provide a variety of service in a host, every client host has a LNA and multiple MAUs. According to the standard specification and the proposed transmission algorithm, we designed and implemented the TLI protocol using object-oriented mechanism. We carried out the experiment under a simple network model similar to real ship environment, and confirmed that it successfully transmits and receives data between the hosts.

• Journal of the Society of Naval Architects of Korea
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• v.46 no.6
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• pp.631-640
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• 2009

The highest priority of the cruise trip is the safety and comfort of its passengers. Though the cruise lines take every appropriate measure to ensure that their Passengers are safe and experience enjoyable vacations it is hard to fulfill all passenger's personnel requirement with limited number of crews. Generally, each passenger is issued an identification card which contains their digital photo and personal identification information on a magnetic strip that he or she must present when entering or leaving the ship. This technology allows the ship to know which Passengers and crew members are on board and which are not. However, this system has some limitations of functions and usage. To support each passenger as his or her personal liking, additional number of crews or some kind of new system is needed. In this paper, the crew support system based on sensor network using wireless and wired communication technologies was studied. To design the system, PLC(Power Line Communication) system and ZigBee based passenger location recognition, classification system has studied experimentally. By using this system, crews can serve passengers more closely and personally with less effort.

• Journal of Navigation and Port Research
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• v.47 no.6
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• pp.419-429
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• 2023

The pinnacle of rapidly changing and advancing maritime transportation technology is expected to be the Maritime Autonomous Surface Ship (MASS). The implementation of various services within the MASS is likely to be feasible through the ship-centric network known as the S2X communication system. However, existing communication systems face issues such as service traffic saturation and failure to meet demanded functionalities, necessitating the proactive introduction of additional communication technologies. In this study, the concept of S2X communication for the MASS was redefined, deriving required functionalities and ultimately selecting frequencies suitable for utilization. Candidate frequency groups suitable for the derived communication requirements were identified, and communication frequencies prioritized for the initial application were chosen through expert consensus. It is anticipated that through further research, including experimentation to validate these frequencies, they could be utilized in implementing services for autonomous ship navigation in the future.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.11
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• pp.1927-1933
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• 2006

This paper proposes the implementation plan of information network for an E-Navigation. Firstly, It configures to the network system based on E-Navigation information network using information and communication technology. And then, it builds on the total port network and tuning up the maritime traffic support system. It will expect to the efficiency through information network between ship to ship related pen operator. Building of information network for the E-Navigation, it is to build on the wireless internet infrastructure for the port logistics and traffic safety.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.11a
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• pp.135-136
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• 2023

This study is an empirical result for building an onboard communication network using metal surface wave communication and is a consideration of its application within the ship. Over the past three years, the applicability and the performance of metal surface wave communication has been confirmed by testing on five small and medium ships. In the tests, IEEE 802.11 protocol of Wi-Fi was used, and the signals were generated in the form of surface waves. Data was sent from AP to AP in the point-to-point form, and the transmission speed was measured at the same time. If necessary, additional repeaters were used to extend the transmission distance. As derived a transmission speed of 5 to 100 Mbps in wireless communication restricted areas of the 5 ships, it is believed that it is possible to reduce the weight of ships and costs by eliminating the communication cables by using surface wave communication as the back-bone network on ships.

• Journal of Advanced Marine Engineering and Technology
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• v.34 no.1
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• pp.116-124
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• 2010

The future warfare is changing to the NCW(Network Centric Warfare) from the platform-based warfare. Korea navy has been developing the KNCCS (Korea Naval Command and Control System) and the KNTDS (Korea Naval Tactical Data System) to prepare the NCW. Also, Korea navy has been using the ICS (Integraed Communication System) to transfer the command, control and tactical information on the naval ship. There is a lack of a systematic research and a reference material, although the ICS is a very important network on the naval ship. This paper is described the naval ICS. Also, a direction of the next Korea naval ICS is proposed.

• Journal of Advanced Marine Engineering and Technology
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• v.32 no.8
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• pp.1269-1277
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• 2008

Ships at sea cannot exchange data among them easily so far. Basically voice-oriented communication systems are the main methods, some of them utilize the HF radio systems at lower bit rates, and for higher bit rates, the Inmarsat or VSAT are adopted. None of them are used widely because of lower qualities and higher costs. There exist many technical and economical limits to have the Internet service just like on land such as the WWW service. In order to achieve the improved transmission rates of the maritime communication networks at farther sea, MANET(Mobile Ad Hoc Network) is one of the most practical models. In this paper, a new routing protocol named EZR (Expansive Search Zone Routing Protocol) is proposed, which is based on SANET (Ship Ad Hoc Network) model that has some different features from MANET and VANET (Vehicular Ad Hoc Network). The search zone for the shortest path is firstly found by EZR. If no path is searched in the zone, the zone is expanded according to the rule of EZR. The zone-expanding and path-searching procedures are repeated until the path is found out. The performance of EZR is evaluated and compared with LAR protocol which is one of the most typical routing protocols based on geographical information. The simulated results show that EZR is much better than LAR at sea environments in terms of routing success rate, route optimality, and a single index of performance combined the previous two metrics.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.12 no.5
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• pp.2103-2123
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• 2018

Ships built today are larger in scale and feature more complex structures. The ever-evolving systems used on board a ship require vast amounts of data processing. In the future, with the advent of smart ships, unmanned ships and other next-generation ships, the volumes of data to be processed will continue to increase. Yet, to date, ship data has been processed using wired networks. Placed at fixed locations, the nodes on wired networks often fail to process data from mobile devices. Despite many attempts made to use Wi-Fi on ships just as on land to create wireless networks, Wi-Fi has hardly been available due to the complex metal structures of ships. Therefore, Wi-Fi on ships has been patchy as the ship-wide total Wi-Fi coverage has not properly implemented. A new ship-wide wireless network environment is part of the technology conducive to the shipbuilding industry. The wireless network environment should not only serve the purpose of communication but also be able to manage and control multiple features in real-time: fault diagnostics, tracking, accident prevention and safety management. To better understand the characteristics of wireless frequencies for ships, this paper tests the widely used TETRA, UHF and Wi-Fi and sheds light on the features, advantages and disadvantages of each technology in ship settings. The proposed deployment of a Super Wi-Fi network leveraging the legacy UHF system of TMS generates a ship-wide wireless network environment. The experimental findings corroborate the feasibility of the proposed ship-wide Super Wi-Fi network environment.