• Journal of Satellite, Information and Communications
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• v.12 no.4
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• pp.166-169
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• 2017

This paper describes atmospheric phenomena and effects for satellite-to-ground laser communication channel. Satellite laser communication has advantages such as very high bandwidth, inherent security, robustness to electromagnetic interference, unlicensed frequency band. However, satellite laser communication is affected by various factors. Transmission quality is degraded by factors as system loss, geometric loss, misalignment loss, atmospheric loss. Atmospheric loss is major factor of performance degradation. In this paper, the atmospheric phenomena such as absorption, scattering and turbulence are discussed and analyzed for developing satellite laser channel model and laser transmission scheme robust to atmospheric phenomena.

• Review of KIISC
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• v.15 no.6
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• pp.19-30
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• 2005

본 논문은 현재 생체인식에서의 큰 문제로 대두되고 있는 개인 정보(Privacy) 보호문제를 해결하기 위한 방법들을 소개하고 있다. 이를 위해서는 여러 가지 기술이 사용되는데, 우선 생체정보가 도난 되었을 경우 그 피해를 최소화하기 위해 원래의 생체정보를 저장하는 것이 아니라 변환된 생체정보를 저장하고 사용하는 생체정보 변환 기술을 소개한다. 또한 원래의 생체정보가 유출되어 이를 이용해 위조 생체 등을 만들어 공격할 경우를 대비할 수 있는 위조 생체 검출 기술을 소개하며, 생체정보의 유출된 출처를 찾기 위해 생체정보에 소유권 등을 표시하는 데이터 은닉 기법도 소개한다. 이 외에 생체정보를 이용하여 일반적인 암호화 알고리즘에 사용되는 키를 은닉하고 생체정보를 통해 인증된 사용자에 한하여 키를 사용하도록 하는 방법도 소개한다. 끝으로 이러한 개인 정보 보호 기술들을 이용하여 생체인식 시스템의 보안성을 향상시키는 방법에 대하여 논의한다.

• Proceedings of the Korea Multimedia Society Conference
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• 2002.05d
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• pp.877-881
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• 2002

Digital contents such as image need both secure proving and publicly verification scheme on embedded digital watermark for contents distribution and copyright protection. Specially, we must provide publicly verification mechanism on digital watermark without revealing any of the secret information hidden on digital contents. In this paper, we review on the existing zero knowledge proofs and digital watermarking system, and propose advanced interactive zero knowledge proofs mechanism for enhancing the performance and security of watermark verification process. And it Provides a new watermark verification scheme without revealing any secret on the contents owner's copyright in formation.

• Proceedings of the Korea Multimedia Society Conference
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• 2012.05a
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• pp.432-433
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• 2012

조선 산업 현장에서 선박 건조 공정에서 생산된 선박 블록에 대해 조선소 야드 내 위치를 식별하는 것이 필요하다. 본 논문은 사용자가 3G 무선통신 기반의 모바일 기기를 이용하여 물류상황을 파악하고, 현장에서 직접 블록의 위치를 선박물류시스템에 입력할 수 있는 GPS 기반 위치 인식 시스템을 제안한다.

• Proceedings of the KSRS Conference
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• 2004.10a
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• pp.154-157
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• 2004

The KOMPSAT European Cooperation aims at enhancing existing and establishing new collaborations between KARI and various European institutions. The objective is to create mutual data and information exchange possibilities and to develop new data applications of available and future space based Earth Observation sensors. In this paper, the concept of a KOMPSAT regional application center, a joint development between KARI, ARCS and other European partners is presented. This includes the establishment of an additional KOMPSAT-2 downlink in Europe, and the developments of a state-of-the-art user service system for urban and environmental security monitoring.

• The Journal of Society for e-Business Studies
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• v.2 no.1
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• pp.131-151
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• 1997

The CALS/EC is the world-wide accepted concept and its application domain is being expanded continuously throughout the private and public sectors. One of the essential points for realization of CALS/EC is to promote the domestic system integration(SI) industry. This paper describes the present status of the domestic SI companies and the clues to solve their facing problems. In order to evaluate the status of the current SI technology, the MBNQA(Malcom Baldridge National Quality Award) is adopted. The surveyed results show that the average levels of 14 SI companies over 7 evaluation criteria turn out to be 30% through 40% point. The major projects' activities of the SI companies on the information systems over the areas of trade, science and technology, industrial manpower, health and welfare, national security, etc are explained. Also, the competitive power of the SI companies is also discussed. As a target sample, the Korea Telecom(KT) CALS model project is described in terms of its Progresses and Problems. Furthermore, the strategic plans and detailed research items are proposed to resolve on-going issues.

• Proceedings of the Korea Information Assurance Society Conference
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• 2004.05a
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• pp.333-337
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• 2004

The Internet worm is changed rapidly and virus vaccine can not defense the whole Internet worm. To prevent them form spreading into network and analysis specifications, we design and implement the Internet Worm Traffic Generator. In this research, we offer the real worm propagation environment through protocol and scenario specification.

• Proceedings of the Korea Information Assurance Society Conference
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• 2004.05a
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• pp.283-288
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• 2004

인터넷의 발전과 멀티미디어 인프라의 성장으로 방대한 양과, 다양한 종류의 디지털 데이터들이 제작, 유통되고 있다. 디지털 컨텐츠는 기존 아날로그 컨텐츠와 비교 생성, 가공, 유통, 분배등의 측면에서 많은 장점을 갖는 반면, 원본과 동일한 복사물을 쉽게 생성할 수 있는 특징 때문에 디지털 창작물에 대한 저작권 보호가 중요시된다. 본 논문은 이미 유선 환경에서 디지털 컨텐츠 보호 기술로 각광 받고 있는 DRM(Digital Rights Management)을 토대로 무선 환경에서 디지털 컨텐츠의 보안을 위한 Mobile DRM (MDRM) 에 대한 설계를 목적으로 한다 설계되어진 MDRM은 Mobile 환경을 고려 키 교환 및 컨텐츠 암/복호 시 발생하는 부하를 줄이고 컨텐츠의 불법적인 유포 방지를 위한 SDMS(Secret-Key Distributed Management System : 비밀키 분산 관리 시스템)기술을 이용한다.

• Proceedings of the Korea Information Assurance Society Conference
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• 2004.05a
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• pp.59-64
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• 2004

In this paper a design and an implementation of a crypto chip which implements SEED and Triple-DES algorithms are described. We designed it by VHDL(VHSIC Hardware Description Language) which is a designed system-description language. To apply the chip to various application, four operating Modes such as ECB, CBC, CFB, and CFB are supported. The chip was designed by the Virtex-E XCV2000E BG560 of Xilinx and we confirmed result of it at the FPGA implementation by functional and timing simulation using the Xilinx Foundation Series 3.li.

• Journal of Communications and Networks
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• v.8 no.4
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• pp.378-390
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• 2006

Many distributed applications build overlays on top of the Internet. Several unsolved issues at the network layer can explain this trend to implement network services such as multicast, mobility, and security at the application layer. On one hand, overlays creating basic topologies are usually limited in flexibility and scalability. On the other hand, overlays creating complex topologies require some form of application level addressing, routing, and naming mechanisms. Our aim is to design an efficient and robust addressing, routing, and naming infrastructure for these complex overlays. Our only assumption is that they are deployed over the Internet topology. Applications that use our middleware will be relieved from managing their own overlay topologies. Our infrastructure is based on the separation of the naming and the addressing planes and provides a convergence plane for the current heterogeneous Internet environment. To implement this property, we have designed a scalable distributed k-resilient name to address binding system. This paper describes the design of our overlay infrastructure and presents performance results concerning its routing scalability, its path inflation efficiency and its resilience to network dynamics.