• Journal of the Korea Convergence Society
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• v.6 no.6
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• pp.177-183
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• 2015

The image information acquired by a model submarine is transmitted through the repeater. The control signal of a position for submarine and its speed is also controlled by the repeater. Shooting images of underwater circumstances are transmitted to the repeater where the received signal controls a position and speed of underwater submarine. This repeater is combined by a buoy that is floating on the surface to relay the signal of image as well as control between a control unit and a submarine whereas the repeater communicates wirelessly with a control unit. Due to wire communication between the repeater and the submarine, the underwater exploration can be smoothly carried out without a risk of loss of a model submarine. Also, connecting to the repeater and control unit wirelessly makes it possible to conduct easily the underwater exploration. The convergence technology that combines a wireless communication and a control as well as a model submarine is designed.

• Proceedings of the Korean Society of Computer Information Conference
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• 2017.01a
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• pp.191-192
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• 2017

해상에서는 도로가 아닌 해상 위라는 환경 때문에 음주단속을 실시하여 음주운항을 예방하기엔 어려움이 존재한다. 원거리로 신체정보를 보낼 수 있는 음성을 통하여 음주단속을 한다면 거리가 얼마나 떨어져 있더라도 실시간으로 측정이 가능하다. VTS 무선 교신 환경을 이용하여 음성을 통신할 때도 무선 환경이 고르지 못할 경우에 클리핑이 일어나 음주가능성 판단율이 저하될 수 있다. 따라서 본 논문에서는 음성신호가 왜곡이 되어 음주 가능성 여부의 판단율 오차를 줄이기 위해 신호를 보상하는 방법을 제안하였다.

• Journal of the Korea Society of Computer and Information
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• v.11 no.4 s.42
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• pp.61-68
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• 2006

As high speed Internet service technology develops. many people are accessing wireless internet service by using mobile devices. However. an HTLM web page for PC is not very compatible with wireless internet because of its unnecessary advertisements, high resolution. and various multimedia data. This is because the main focus when creating it was on high speed. As this research indicates with the RSS channel. converted from the main part of the HTLM web page, which users show interest in. a wireless compatibleinternet page can easily be created. Consequently, web administrators could create a wireless page easily and quickly, and wireless users would be able to find information in the same manner.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.223-226
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• 2007

해상에서의 조난통신은 최초의 모오스부호에 의한 조난통신에서 무선전화에 의한 조난통신을 거쳐 현재는 디지털선택호출장치에 의한 조난통신방식으로 변화하고 있다. 그러나 우리나라의 대부분의 해안국 운용체제는 아직도 무선전화에 의한 조난통신 처리 방식에 주로 의존하고 있어 디지털선택 호출장치에 의한 조난통신 처리를 위한 개선이 시급하다. 여기에서는 우리나라 해역에서 발생하고 있는 조난신호의 통신방식별 송수신 현황 및 우리나라 해안국의 설치 현황을 분석하고 각 해안국의 통신권에 대한 시뮬레이션을 토대로 해안국의 조난통신을 위한 운용상의 문제점과 효율적인 조난통신을 위한 해안국의 연계 방안 및 디지털선택호출장치에 의한 효율적인 조난신호 처리 절차에 대하여 제안하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2019.05a
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• pp.89-91
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• 2019

1998년 도입된 GMDSS 제도의 현대화를 위한 프로젝트가 2012년부터 IMO 주관으로 추진되고 있다. 이와 관련하여 ITU에서는 2016년부터 전파규칙 개정을 위한 논의가 시작되었으며, 올해 11월에 최종 개정안이 확정될 예정이다. NAVDAT 및 VDES 같은 신규 무선설비들의 도입이 검토되고 있으며, Iridium 위성 시스템이 GMDSS 추가 위성시스템으로 승인되어 관련 후속조치가 논의되고 있다. 본 논문에서는 최근 해상통신분야의 국제회의 동향을 분석하고 이에 따른 우리나라의 대응방안을 제시하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.6
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• pp.1365-1374
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• 2010

The maritime traffic is more complex these days. It is more hard for the small fishing ships to navigated in shores. The requirements for the navigate information system to protect the sea environments and support the small fishing ships are more increased. However, the Inmarsat communication system is too burden to the fishermen with the expensive terminal and call fees. We propose the wireless digital fishing information network which use the existing MF/HF SSB communications system by connecting I-PHONE, PDA, NetBook, Notebook, PC, etc with the PSK31 method and AIS(Automatic Identification System) on the MF/HF radio Band.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.1117-1124
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• 2005

The radio field environment is very different according to frequency band, therefore communication condition is equation that VHF is passed by direct radiation and HF is via reflect radiation in ionosphere. Load a ship according to the enforcement regulations of the ships safety act have specificated the radio equipment that should be operating. This paper have analysed by the simulation program about radio field environment for research the communications condition, which is VHF & HF band in domestic coastal. We have Predicted to radio field environment and communications condition using the data of analysis and domestic radio regulation regard to coast navigational ship. Therefore have proposed the necessity for rationally plan on improvement the radio regulation and network cooperation of VHF radio station.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.05a
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• pp.554-558
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• 2002

In this paper, we analysed the technical characteristics of a universal shipborne automatic identification system using self-organizing time division multiple access in the VHF marine mobile band. IMO's Marine Safety Committee approved revision of chapter V of the Safety of Life at Sea(SOLAS) Convention in 73rd meeting. According to this revision, AIS will become a nandatary carriage requirement by 01 July 2002. AIS is a broadcast system, operating in the VHF marine band. It is capable of sending infomation such as would be beneficial to the safety of navigation and the identification and monitoring of maritime traffic. It is absolutely necessary to analyse the related international and domestic specifications for the AIS implementation and installation.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.2
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• pp.250-256
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• 2006

The revision of radio waves act, which took effect on July 1,2005, widened the bandwidth of PLC from $9kHz{\sim}450kHz$ to $9kHz{\sim}30MHz$. This high upper limit of frequency may cause the interference in HF wireless communications. From this point of view, the goal of this research is to suggest the estimation method of whether-or-not the interference occurs and furthermore offer countermeasures to avoid it hereafter. Ministry of Information and Communication Radio Research Laboratory(MIC-RRL)has been researching for the interference and devoting themselves to turn out how much it affects to HF wireless communications since the revision took effect. This research suggests some estimation methods with receivers, signal generators, or SINAD(Signal to Noise and Distortion) Meter which is so suitable for the RF environment that we can overcome the existing limit to the EMC environment. In addition, this research is focused on securing the environment for wireless communications by establishing the safety zone or suggesting the ways to prohibit the use of the bandwidth, which may cause serious interference, in order to minimize the effect of PLC on HF maritime mobile telecommunications.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.3 no.3
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• pp.477-484
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• 1999

With the development of electronic communication techniques, maritime communication system has been much changed. Since the maritime communications by the radio telegraph have been initiated, the GMDSS came into internationally effect for the life and safety at the sea from 1992, new maritime communication system has been constructed. The new systems have being implemented and applied to merchant ships over 300G/T (or safety of the life. But the annual reports show that most of casualties last 10 years happened to small ships, have been gradually increased. For the improvement of those circumstances, more effective SAR system and administrative plans should be executed. In this paper, we analyzed the maritime casualties last 10 years, maritime communication system, and SAR facilities in domestic. Through the result from the analysis, we discussed the current situations, summarized several conclusions for the developmental proposals.