• ETRI Journal
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• v.11 no.4
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• pp.128-138
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• 1989

광을 이용한 축소투영 노광기술은 고 NA와 단파장화에 의하여 현재 $0.5\mum$의 패턴형성을 가능하게 하고 있으며, 향후 excimer laser를 이용한 stepper는 64M DRAM 제조를 위한 핵심 노광장비가 될 것이다. 본 논문에서는 광을 이용한 노광장비의 성능개선을 위하여 노광방식에 따라 장비를 분류하고 MTF, coherence 등 패턴형성에 있어서의 주요개념을 정리하였다. 그리고 광노광 장비의 성능변수인 해상도, 촛점심도, 노광영역 및 정렬에 영향을 미치는 요소를 분석한 후 그 성능에대한 개선방안을 도출하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.05a
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• pp.1593-1596
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• 2004

현재 네트워크 장비 관련 시장에서는 기술력과 가격대 성능비와 같은 객관적인 평가 기준에 의한 공정경쟁이 시장을 지배하게 되었다. 즉, 독립성과 신뢰성을 가지고 있는 사설 시험소들의 시험 결과와 인증 마크가 네트워크 장비 구매자들의 구매 기준으로 적용되기에 이른 것이다. 이에 본 고에서는 우리나라에서 시행 중인 네트워크 장비 시험인증 기관의 체제에 대해 고찰하여, 국내 시험 인증 기관의 시험인증 서비스에 대한 개선 사항을 제안하고자 한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.1
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• pp.19-25
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• 2003

The radio communications by SSB and VHF transceivers are still used very efficiently in coast stations. The SSB and VHF equipments are very important to transmit and receive informations in the sea and the land. The communication system by the conventional SSB and VHF transceivers between a coast station and a terminal is an one-to-one system. In this dissertation, however, the conventional one-to-one system is expanded to one-to-multiple systems. Then, frequencies can be used effectively for distress, urgency, safety traffic. In addition, one to multi-number systems can be used to interrupt. When the ICS equipments are set up to the VHF transceiver. It is possible to communicate with ship in far distance the communication range can be enlarged. The line switching system by the ICS is to be remote-controlled by ASK modulated PTT signals and audio signals. An ICS can change a connection between terminal and transceiver through a circuit switching system at any time. For this purpose, the author has researched and developed a ASK transmission system, ICS system, control algorithm, multiprocessor system, and monitoring system. As a conclusion, the developed line switching control systems and equipments can be used effectively for maritime communication, military communication, fishery communication, etc.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.4
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• pp.765-772
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• 2011

In this paper, a simulation-based method is presented to dispose direction finders in three dimensional space for locating targets using the directional data. A direction finder(DF) is a military weapon that is used to find locations of targets that emit radio frequencies by operating two or more DFs simultaneously. If one or more DFs are operated in the air, the accuracy of location estimation can be enhanced by disposing them in a better configuration. By extending the line method, which is a well-known algorithm for 2-D location estimation, into 3-D space, the problem of 3-D location estimation is defined as an nonlinear programming form and solved analytically. Then the optimal disposition of DFs is considered with the presented method in which methods of simulation and search technique are combined. With the suggested algorithm for 3-D disposition of DFs, regions in which targets exist can be effectively covered so that the operation effect of DF be increased.

• Journal of Satellite, Information and Communications
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• v.12 no.4
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• pp.87-94
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• 2017

The broadcast service environment is changed to the complicated equipment configuration of the server and network-based for the advanced technology application and various service providings. The broadcasting market is growing rapidly by the development of broadcasting environment. But as to the domestic production broadcasting equipment industry, the satisfaction of request of the consumer and market competitive power is showing the limit due to the development of the single focused on goods and sale. This research gathered the opinion of the broadcasting technology experts and investigated the reality of usage of the domestic device in the broadcasting system. And according to the investigation result we discovers the hybrid system model that synergy can come out in which the domestic device more than 2 combines out and there is the purpose.

• Journal of the Society of Disaster Information
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• v.14 no.2
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• pp.154-164
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• 2018

Purpose: Recent climate change makes weather-related disasters such as summer storms, heavy rains, winter snowfall disasters, and extreme cold temperature increase in trend. Heavy snowfall disasters requires speedy response due to various effects to traffic flows, buildings, and infrastructure. Heavy snowfall disaster response of South Korea is insufficient, even though heavy snowfall disasters affect urban safety. There have been lack of policy studies for heavy snowfall disasters. Method: This research analyzes case studies and explores implications using Information system technologies to snow removal vehicles and equipments for speedy snow removal during the heavy snowfall disasters. Results: Information system technology attachment to snow removal equipments can identify locations of snow removal vehicles and equipments for emergency period to support snow removal of adjacent jurisdictions. Conclusion: Case studies of this research can be further used for efficient application of snow removal tools of local governments.

• Journal of Satellite, Information and Communications
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• v.12 no.1
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• pp.88-93
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• 2017

Policy maker inevitably faces two restraints once they attempt to accomplish $4^{th}$ Industrial Revolution through development of Industrial Internet of Things(i.e. IIoT). One is to construct physical network by substituting old equipment and infrastructure into smart equipment and the other is to connect the physical network into national telecommunications infrastructure. Australia, as she proceeds National Broadband Network programme, has assembled all medium of telecommunications to provide every Australian premises regardless to its physical location by creating wholes-sale only carrier, NBN co. At the same time, Australian government also provides its own IIoT policy; Co-development and New-Development projects. Meanwhile, NBN co. has launched its own two communication satellites in 2015 and 2016 to replace the old satellite communication services depended on the other companies' satellites. This article, in the end, analyses the role of satellite communication in $4^{th}$ industrial revolution with case study on Australian policy.

• Electronics and Telecommunications Trends
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• v.9 no.4
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• pp.83-98
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• 1994

통신 장비 및 서비스 시장의 개방화에 따른 국가간 경쟁 체제 속에서 통신 정책 입안자의 관심이 단말 장치에 대한 형식 승인 제도의 세부 규정과 절차의 명확성을 위한 각종 제도 장비, 그리고 단말 장치 기술 기준의 효율적 운용 방안 등에 모아지고 있다. 이를 반영하여 호주는 1991년 전기 통신법의 개정, 형식 승인 기관인 AUSTEL의 기능 강화, 국가 및 지역간의 형식 승인 조화를 위한 AUSTEL의 국제적인 각종 활동 등을 통하여 대내 외적으로 형식 승인제도와 형식승인 기술 기준의 미비점을 보완해왔으며, 현재 세계 각국과의 형식승인 상호인정을 위한 효율적인 활동체계를 구축하고 있다. 본 고는 단말 장치 형식 승인 제도 운영 등에 활발한 움직임을 보여주고 있는 호주의 형식 승인 지침(Technical Approvals Guide No.3)과 전화망 접속 기술 기준(TS-002)의 적용 동향을 파악하여, 최근 호주와 형식 승인 상호 인정을 계획하고 있는 우리나라의 통신 협상 대응 방안 설정시 활용하고자 한다.

• Electronics and Telecommunications Trends
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• v.30 no.4
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• pp.151-161
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• 2015

통신장비의 하드웨어와 소프트웨어를 분리함으로써 소프트웨어 중심의 네트워크 인프라를 실현하고, 이를 통해 서비스를 민첩하고 유연하게 제공하는 동시에 비용 절감을 꾀할 수 있는 네트워크 기능 가상화(Network Functions Virtualisation: NFV) 기술에 대한 관심과 기대가 날로 높아지고 있다. 특히 통신장비 수준의 NFV 참조 플랫폼을 개발하려는 공개 소프트웨어 기반의 OPNFV(Open Platform for NFV) 프로젝트의 출범은 이러한 움직임에 촉매가 된 것이 분명하다. 본고에서는 2014년 9월말에 출범한 OPNFV 프로젝트에서 추진되고 있는 개별 프로젝트를 통해 OPNFV 프로젝트의 개발방법과 특징을 정리한다. 또한 OPNFV의 첫 번째 공식 배포판인 ARNO의 구성과 특징을 정리하고, ARNO 후속 배포판의 개발방향을 전망해 본다.

• TTA Journal
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• s.94
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• pp.149-154
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• 2004