• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.05a
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• pp.297-300
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• 2012

Since the adoption of GMDSS, the band 495-505 kHz has no longer been globally used for maritime calling and distress and the designation of this band for calling and distress was suppressed at WRC-07. In accordance with provision RR, maritime mobile operations are presently limited to radiotelegraphy. Accordingly, use of the band has diminished.This frequency band 415 kHz to 526.5 kHz and high frequencies is ideally suited to broadcast from shore to ship. The surface wave propagation of a coast station using this band can provide a coverage area from the coast to 400 nautical miles off shore.

• The Science & Technology
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• no.1 s.404
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• pp.56-60
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• 2003

세계 최고의 극비기관인 미 국가안전보장국(NSA)이 운영하는 '에셜론(Echelon)' 시스템은 국경을 넘나드는 전화통화, 팩스, 텔렉스, 전자우편은 물론 단파, 항공 및 해상주파를 포함한 무선신호 등 세계 각국에서 벌어지는 전자통신을 대부분 감청할 수 있다. 하지만 1998년 이른바 '에셜론 국제통신 감청 시스템'에 관해 이런저런 보도가 나갔을 때 미국과 유럽 당국은 이 사실을 대부분 부인했다. '에셜론'은 어떤 조직이며 어떤 일을 하는 곳인지, 유럽의회의 2000년 도청능력보고서를 통해 알아보았다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.252-255
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• 2005

In this paper, we analysed the new techniques for maritime mobile communications replacing NBDP in MF/HF bandwidth. Several countries already have contributed to new proposals for new digital systems through international standardization organizations as ITU, IMO and IEC. ITU-R SG8B in ITU reviews the contributed documents and discusses about radio regulations relating new systems. Also COMSAR in IMO reviews member's countries opinions and statues for introducing new techniques and replacing NBDP.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.1 no.1
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• pp.113-121
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• 1997

The maritime mobile communication system has been changing to the new system that is facilitated by the radio telex, digital selective calling and maritime satellite communications from the old system by the radio telegraphy and telephone according to the GMDSS. The NBDP using the ITA No.2 code is a useful media in the maritime communications and provides the procedures of telex. Also it can provide the efficient and more useful functions and the solutions for the incremental traffic requirements by adopting the Hangul code. So, in this paper, we proposed the new Korean NBDP code for the ITA No.2 code, designed and implemented the algorithm which is the processing of the Hangul NBDP code using the microprocessor.