• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.4 no.4
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• pp.264-271
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• 2011

ILS(Instrument Landing System) is the international standard system for approach and landing guidance. ILS was adopted by ICAO(International Civil Aviation Organization) in 1947 and is currently being used in commercial systems. To design the digital transmitter and receiver modules that can be mounted in the integrated ILS, we propose the digital design methods of digital double AM modulator and demodulator using FPGA chip, DDS(Direct Digital Synthesizer) for generation of sampling clock, demodulator of DDC(Digital Down Converter) structure, and spectrum analyzer using DSP chip. We demonstrate the efficiency of the proposed design method through experiments using developed transmitter and receiver modules. This system can be used as a high-performance commercial system.

• The Journal of the Korea institute of electronic communication sciences
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• v.9 no.10
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• pp.1181-1187
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• 2014

In this paper, we implemented polar transmitt converter based on software for next generation digital wireless communication system. The implemented converter converted from rectangular to polar by CORDIC algorithm, and be made up of sweep for DDS output frequency using software control. The implemented converter shows can frequency control up to 1.16GHz within DDS frequency control range by software control. it means that transmitter can be control of varied blocks such as gain, phase, output and etc.. The implemented converter can be applied digital wireless communication system based on SDR.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.10a
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• pp.593-596
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• 2010

Currently, maritime information service is provided by a variety of equipments such as satellites, radar and VHF devices with independent standards and protocols. However, the increase of vessel traffic and development of global marine industries need an infrastructure providing seamless information transfer for the safety, security and protection of the marine environment. Therefore, we propose features and requirements of future VHF data systems and equipments as a component of e-Navigation.

• Proceedings of the KIEE Conference
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• 2008.11a
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• pp.406-408
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• 2008

최근 전력IT 사업으로 추진되고 있는 디지털 기반의 설비 감시 진단 시스템은 유비쿼터스 센서 네트워크 기술(USN) 기반의 무선 통신 환경 접목이 큰 줄기를 이룬다고 할 수 있다. 이에 본 논문에서는 전력 설비의 운영 신뢰성을 검증하고, 설비 감시 시스템에 ZigBee 무선 통신 적용 가능성을 고찰 하고자 한다. 설비 감시 진단 프로그램은 API(Windows Application Programming Interface)와 MFC(Microsoft Fundamental Classes)를 이용하여 구현하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.4C
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• pp.262-268
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• 2005

The unit of the digital content delivery is the web object. For the improvement of the content delivery based on the web, it id required analysis of reference characteristics of the web object. In this study, we analyze reference characteristics of the web object and evaluate the performance. Using these analysis results, we propose the digital content delivery system which is improved delivery efficiency. The goal of the proposed system are the improvement of the processing time through enhancement of the caching efficiency with reflect reference characteristics of the web object. And the experiment result, we verify the performance enhancement.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.701-704
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• 2005

In this paper, we looked into the feature of a transmission system of the terrestrial digital broadcasting system and considered a ATSC 8-VSB transmission standard. Also, we analyzed the performance with the influence of an interchannel interference by the ATSC standard. As a result, the case not to consider Rician fading, The influence of the interfere did not exist if Frequency interval fell off over the 20MHz. The case to consider Rician fading, the system had the degradation of the performance.

• The Magazine of the IEIE
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• v.29 no.4
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• pp.39-47
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• 2002

기존의 아날로그 통신 방법이 디지털 통신 시스템으로 바뀌면서 신호 전송방법에 많은 변화를 일으키고 있다. 특히 이동통신 기기 중에서 통신 품질과 장비의 효율을 결정하는 고출력 전력증폭기는 기존의 전력증폭기에 비하여 더욱더 많은 기술들이 요구되어지고 있다. 본 고에서는 이러한 고출력 증폭기의 고유한 특성들과 이를 보상할 수 있는 선형화기술들에 관하여 고찰하고 이러한 기술의 동향에 관하여 살펴보았다.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.11a
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• pp.364-364
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• 2004

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1996.06a
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• pp.148-151
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• 1996

• Digital Contents
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• no.3 s.130
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• pp.78-79
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• 2004

국산 게임의 수출 활로 개척을 지원하기 위한 민관 협의체가 출범했다. 정보통신부는 지난달 12일 게임업체, 통신사업자, 유관기관등과 함께‘게임수출협의회’를 발족, 최근 수출 유망품목으로 부상하고 있는 국산게임에 대한 종합적인 지원시스템을 마련했다.