• 한국통신학회논문지
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• 제9권4호
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• pp.141-152
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• 1984

Nowadaty, To keep pace with the mass transportation carried out by vessels in the international trade, the Korean government is trying to make a rapid progress to be a higher ranked shipping country to the world through the shipping increase. For the effective management of international trade by vessels and the safe operation of vessels, it is indispensable for ships radio communication to be effective and smooth. Therefore, to enhance the efficiency of ships radio communication is one of the primary factors to be solved for the econimics of shipping management. The reserch area is not only limited to the ships radio communication on the North Pacific Ocean but limited to the ships radio communication which is one of the chiefest methods of communications. From the research for the efficient methods of ships radio communication, the following results are obtained. (1) The operator on ships radio communication should have the knowledge of specific know-how and wide experience in the operation of ships radio communications. (2) The operator should abopt the radio propagation prediction made by the Ministry of Communications to use the best ionosphere reflection in the short wave communications. (3) The increase the radio officer of 1 to 2 in order to contrive the safety at sea and to keep the ships radio communication fare low. (4) The owner should pay their attentions to the education and employment of radio officer. (5) The authorities concerned on the ships radio communication should estabilish the effective and consistent policy for the ships radio officers.

• 한국전자통신학회논문지
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• 제11권9호
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• pp.849-854
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• 2016

현재 이동통신망에서 요구되는 많은 통신량을 수용하기 위해서 새로운 주파수 대역을 사용하는 5G New RAT(: Radio Access Technology) 에 대한 연구가 활발히 진행되고 있다. 하지만, 이러한 새로운 New RAT 기술이 이동통신에 적용되었을 때에 이를 유선 이동통신망에서 수용할 수 있을지에 대해서는 제대로 연구된 바가 없다. 따라서, 본 연구에서는 이러한 New RAT 기술을 RoF(: Radio over Fiber) 기술로 이동통신망의 Fronthaul에서 수용이 가능한지에 대한 연구를 진행하였다. 본 연구에서는 New RAT 의 기술로 밀리미터파 통신기술, 테라헤르츠파 통신기술, 무선 광통신 기술 등을 고려하고, 이들 각각에 대한 RoF 기술의 응용 가능성을 연구하였다. 연구의 결론을 요약하면, 10 년 이내의 범위에서 세 가지 New RAT 기술 중에 밀리미터파 통신기술에 대해서만 RoF 수용성을 고려하면 되는 것으로 판단되며, 빔포밍을 사용하는 경우에는 밀리미터파 통신기술의 요구 전송 대역폭이 너무 많아 Fronthaul 에서 RoF 기술로도 수용이 쉽지 않은 것으로 결론이 내려졌다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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• pp.1568-1569
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• 2005

This paper presents a method to optimize train radio communication network for train control(CBTC) or multimedia services. To determine the optimized distance between wayside radio stations in a radio communication network constructed along railway, radio frequency allocation and hand-over capability is studied in terms of radio communication cell coverage and roaming feasibility.

• 한국통신학회:학술대회논문집
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• 한국통신학회 2004년도 추계종합학술대회 논문 초록집
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• pp.149-149
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• 2004

• 한국통신학회:학술대회논문집
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• 한국통신학회 2004년도 추계종합학술대회 논문 초록집
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• pp.127-127
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• 2004

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.296-297
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• 2006

This paper presents a method to optimize train radio communication network for train control (CBTC) or multimedia services. To determine the optimized distance between wayside radio stations in a radio communication network constructed along railway, radio frequency allocation and hand-over capability is studied in terms of radio communication cell coverage and roaming feasibility.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.1533-1540
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• 2007

The most critical function of the Communication Based Train Control system is wayside and on-board Radio communication. Radio communication must be safely made without errors. The standards for CBTC has not been established yet, and research on Radio communication systems for use in Train control systems adopting CBTC system such as the magnetic levitation train must continue. This paper will discuss the characteristics of Radio communication technology currently used domestically such as GSM-R, IEEE 802.11, TETRA, MESH, and WiMAX/WiBro, and will investigate the potential possibility of applying them to Train control systems.

• 한국IT서비스학회:학술대회논문집
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• 한국IT서비스학회 2009년도 추계학술대회
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• pp.473-476
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• 2009

통신 서비스는 음성, 문자, 영상 등으로 발전해 왔고, 이모티콘, 플레시콘 등 점점 더 다양한 통신 서비스로 발전 되고 있다. 본 논문에서는 기존의 통신서비스에서 제공하는 문자, 음성, 영상 데이터에 인간의 감성 데이터를 부가한 새로운 통신 서비스를 제안한다. 제안된 새로운 통신 서비스를 구현하기 위하여, 인간 감성을 나타내는 생체 신호를 측정하여야 하며 여기서는 그 측정기를 구성하는데 있어 가능한 방법에 대한 연구이다. 인간의 감성을 나타내는 생체신호로는 맥박, 혈압, 긴장도 등등이 될 수 있는데, 본 논문에서는 생체신호 중 하나인 맥박신호를 적용하였고 인터넷상에서 서로 통신이 가능하도록 바이오 멀티미디어 통신 서비스를 구성 하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.275-281
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• 2005

In this paper, a new algorithm is proposed for high speed roaming in an Intelligent Train Control System(ITCS) and study on optimized positioning of radio communication equipment. A DCS(Data Communication System) which is a main part of CBTC(Communication Based Train Control) system, is consisted of radio based wireless communication system and wired optical system. In the radio based wireless communication, the position of AP enclosures and antennas shall be optimized for the guaranteed communication channel between wayside and trains both in open aired and tunnelled area. Also a communication channel established between wayside and train shall be maintained while train moves at its maximum speed. This study shows the way of determining the optimal position for the railway side communication equipment in Bundang Line and how to achieve continuous communicating channel for tracking and controlling train.

• 한국항해학회지
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• 제17권2호
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• pp.75-106
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• 1993

GMDSS(Global Maritime Distress and Safety system) is a new communication system for the distress and safety at sea which is utilizing the recent advancements in satellite communication and positioning system, digital communication system, computer and microelectronic technology, etc., and will completely substitute the current communication system by 1999. Although the improvements of education for producing qualified Radio Operators as well as the establi-shments of policy for accepting the system are required, the educational institutions and relating administ-rations have not yet prepared the rational and concrete schemes on the educational methods and accepting procedures for the system. In this study, as the result of analyzing the GMDSS, courses of training and relating data, the authors suggested principles for improving the course and contents of education and rational schemes for balan-cing the demand and supply of Radio Operators. The authors expect not only the consequences of this study can be utilized as reference materials for the instruction to ratio communication in the organs of education but also that the following effects can be obtained by the study. 1. Security of distress and safety communication system at sea by the establishment of relating regula-tions. 2. Rationalization of the management of radio communication at sea and improvement of the communi-cation system on the vessel. 3. Upgrading the quality of Radio Operators and presenting schemes for current qualified persons. 4. Activation of industry producing radio instruments. 5. Balance of the demand and supply of Radio Operators and development of shipping industry.