• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.10a
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• pp.362-364
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• 2012

e_Loran은 GNSS와는 다르지만 상호 보완적이고 통신네트워크 및 전력그리드등과 같은 중요한 국가 인프라에 GPS를 대신해서 시각과 주파수 신호를 제공할 수 있다. 그리고 현재 추진 중에 있는 e_Loran 시스템 구축이 완료되면 시각과 주파수 부분에서 예비 신호원으로서 활용이 가능할 것이다.

• Journal of Navigation and Port Research
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• v.36 no.6
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• pp.475-480
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• 2012

In order to establish eLoran (enhanced Long Range Navigation) system, it needs the advancement of receiver, transmitter, data channel addition for Loran information, differential Loran sites for compensating Loran-c signal and ASFs (Additional Secondary Factors) database, etc. In addition, the precise synchronization of transmitting station to the UTC (Coordinated Universal Time) is essential if Loran delivers the high absolute accuracy of navigation demanded for maritime harbor entrance. For better timing synchronization to the UTC among transmitting stations, it is necessary to measure and monitor the transmission delay of the station, and the correction information of the transmitting station should be provided to the user's receivers. In this paper we presented the measurement method of absolute delay of Pohang Loran transmitting station and developed a time delay measurement system and a phase monitoring system for Loran station. We achieved -2.23 us as a result of the absolute phase delay of Pohang station and the drift of Loran pulse of the station was measured about 0.3 us for a month period. Therefore it is necessary to measure the delay offset of transmitting station and to compensate the drift of the Loran signal for the high accuracy application of PNT (Positioning, Navigation and Timing).

• Proceedings of KOSOMES biannual meeting
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• 2017.04a
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• pp.96-96
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• 2017

• Proceedings of KOSOMES biannual meeting
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• 2017.04a
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• pp.149-149
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• 2017

• Journal of the Korean Institute of Navigation
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• v.12 no.1
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• pp.45-53
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• 1988

In this paper, the equations calculating GDOP are induced in Hyperboic, and Spherical Navigation System, respectively, The GDOP diagram shows that the DGOP in the inner region of Beacons is similar each other, but the GDOP of Hyperboic Navigation System is much larger than that of Spherical Navigation System due to GDOP in the outer region of Beacons. The authors propose the algorithm estimating the pulse starting time using the Hyperboic Navigation System, and prove that if Navigation use the Spherical Navigation System by adopting the proposed Algorithm -in this case, "Pseudo Sperical Navigation System" - in the outer region where GDOP is becoming large, the position errors can be reduced.e reduced.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2005.10a
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• pp.163-168
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• 2005

Loran-C(Long Range Navigation) is the only stand alone navigation system of the world Ministry of Maritime Affairs and Fisheries(MOMAF} of Korea is operating the Korea Chain(GRI : 9930, Master station : Pohang, slave station : Kwangju, Gessashi; Nijima, Ussurisk) around the country. Due to decreasing the users and being antiquated New Loran System is being developed in United States. In this study, the policy establishment of Loran-C in Korea is suggested.

• Journal of Advanced Marine Engineering and Technology
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• v.34 no.1
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• pp.133-140
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• 2010

NMEA2000 protocol known as IEC61162-3 of Multi-talker, Multi-listener, PnP communication is adopted as standard network for SOLAS ship by ISO in 2008 for e-navigation ages. NMEA2000 network uses well known CAN in physical layer. In this paper, address claim function is implemented for protocol converter device which can be used easily in combination with CPU of non network device. We are going to implement full function of NMEA2000 protocol and provide guideline to develop ship equipment to be networked easily.

• Electronics and Telecommunications Trends
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• v.35 no.3
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• pp.85-97
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• 2020

In the maritime industry, the convergence of information and communication technology (ICT) occurs in two areas. The first one is the convergence of e-navigation technology to apply ICT to the maritime domain. This was led by EU's initiative and is also being promoted in our country. The other one is the convergence of autonomous ship technology to apply various ICT technologies for commercial purposes. This initiative is being led by maritime industries. In this paper, we describe trends of e-navigation and maritime autonomous surface ship technology convergence. Subsequently, we explain the standardization status of performance and technical standard bodies, international standardization organizations, and related standard-developing organizations to provide the interoperability of these technologies. Finally, we examine ongoing projects in Korea and suggest future directions for their R&D and standardization.

• Journal of the Korean Institute of Intelligent Systems
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• v.23 no.6
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• pp.577-582
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• 2013

In this paper, the state-of-the-art IVEF Service based on e-Navigation System was represented. The unification of the data exchange format among maritime-related systems is one of vital user-needs of e-Navigation, advantageous in bringing maritime safety and security. This paper propose the method to exchange marine information in IVEF, as recommended by the IALA, between VTS centers and Korea's GICOMS as well as the government-related agencies. To achieve this, a system data flow was designed which it acts as client and server. It enables the sending and receiving of Radar and CCTV images in accordance with the IVEF recommendation document of IALA.

• Proceedings of KOSOMES biannual meeting
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• 2007.05a
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• pp.121-126
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• 2007

지난해 국제해사기구 (IMO)의 MSC 는 NAV 및 COMSAR 전문위원회에 E-Navigation 에 대한 전략 개발을 지시하였다. 효율적이고 안전한 선박 운항을 위한 E-navigation 서비스 구현을 위해서 해상 정보와 정보체계에 대한 이해가 선행되어야한다. 본 연구에서는 현재 범유럽적 차원에서 진행 중인 MarNIS 의 정보체계와 정보 에이전트에 대해서 살펴보았다. MarNIS 는 에이전트의 정보 창구로서의 Single Window와 각 시스템 말단에서 데이터 변환기로서의 MarNIS 노드에 의해 범유럽의 해상정보체계를 수립하고 있다. 정보 에이전트들이 계층적으로 구조화되고 통합된 해상 정보체계를 기반으로 각종 해상정보를 종합 분석하여 해상교통 지원 서비스와 해상안전 지원 서비스를 구현할 수 있다.