• Title/Summary/Keyword: 디지틀정보기술

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A Study On Digital Signature Using Distance Mixing Algorithm (차분 혼합 알고리즘을 이용한 디지틀 서명에 관한 연구)

  • 박일남
    • The Journal of Information Technology
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    • v.4 no.4
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    • pp.25-35
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    • 2001
  • This paper presents a digital signature scheme for document image which directly embeds a signature onto the document. The time to take in signature is reduced by spreading of signature. Non-repudiation in origin, the 3rd condition of digital signature is realized by proposed digital signature scheme. The transmitter embeds the signature secretly and transfers it and the receiver makes a check of any forgery on the signature and the document, This scheme is compatible with the ITU-T.4(CCITT G3 or G4 facsimile standards).

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Implementation of Advanced Frequency Measurement Algorithm (DSP를 이용한 개선된 주파수 측정 알고리즘 구현)

  • Lee, Jung-woo;An, Jong-hyun;Oh, Yong-taek
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2009.10a
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    • pp.465-468
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    • 2009
  • A frequency in electrical power system changes by the load fluctuation in utility grid, has an influence on a connected generator, and ultimately brings a big trouble in the power system. Therefore, a quick measurement of system frequency and governor control of power system is a very important factor in the reliability and the economic feasibility. In this study, An improve algorithm that measures the power system frequency quickly and accurately is suggested, simulated by using Matlab and programmed using C code through DSP6713 KIT. This algorithm is tested to the arbitrary voltage waveform input. The results show that the suggested algorithm is effective in the accurate and quick frequency measurements.

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Digital Cordless Phone using Spread Spectrum Technology (확산스펙트럼 기술을 응용한 디지틀 코드없는 전화기)

  • 정영화
    • Information and Communications Magazine
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    • v.14 no.3
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    • pp.75-86
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    • 1997
  • This manuscript describes the high level system design for the DCP system. The DCP HS and BS transceivers are composed of five systems, including the RF/IF unit, the Analog Front End(AFE), the baseband modem, the voice codec and the micro-controller. In the following, the core transceiver architecture with the primary functions at these subsystem is described.

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Electronic Cash Schemes for EFT Using Smart Card (스마트카드를 이용한 새로운 전자현금 방식)

  • Youm, Heung-Youl;Lee, Seok-Lae;Rhee Man-Young
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.5 no.1
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    • pp.37-50
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    • 1995
  • The smart card with the cryptography and VLSI technologies makes it possible to implement the electronic cash easily. A number of electronic each schemes have been proposed by many cryptographic researchers. In this paper, we propose a practical electronic cash system, using blind digital signature scheme. Schnorr's authentication scheme based on the discrete logarithm problem, and the hierarchical cash tree based on two one-way hash functions for dividable payment. Thisf electronic cash scheme has such properties as privacy of the payment, off-line payment, non-reuseability of cash, transferability of cash to another customer, and dividable payment of cash. This electronic cash protocol is well suited for implementing in smart card.

A Software Testing Plan for Integral Reactor MMIS Design (일체형원자로 MMIS 설계에 적용을 위한 소프트웨어 시험 계획)

  • Suh, Yong-Suk;Hur, Seop;Park, Geun-Ok;Lee, Jong-Bok;Kim, Dong-Hoon
    • Proceedings of the Korea Information Processing Society Conference
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    • 2001.04b
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    • pp.1097-1100
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    • 2001
  • 소프트웨어 개발자로부터 독립된 소프트웨어 시험자가 수행하는 소프트웨어 시험은 소프트웨어의 안전성 향상을 위해 필요하다. 컴퓨터기반의 디지틀시스템으로 설계되는 일체형원자로 MMIS에 적용하기 위한 소프트웨어 시험 계획을 개발할 필요가 있다. 본 논문은 소프트웨어 시험 계획을 소프트웨어시험 조직 구성, 시험 문서, 시험 절차, 시험 방법을 중심으로 제시한다. 소프트웨어 시험 방법은 원시코드 정적분석과 동적시험을 구분하여 기술한다. 본 논문에서 제시된 소프트웨어 시험 계획은 원자력 규제기관에서 요구하는 소프트웨어 시험 요구사항을 만족한다. 본 논문을 통해 제시된 소프트웨어 시험 계획을 일체형원자로 MMIS 소프트웨어 개발 시 적용하여 소프트웨어 고장율 데이터를 수집할 예정이다.

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A Study on Automatic Surveillance System using VHF Data Link Protocol (해상이동통신에서 VHF 데이터링크 프로토콜을 이용한 자동감시시스템)

  • 장동원;조평동
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.6 no.7
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    • pp.1026-1031
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    • 2002
  • In this Paper, We analysed the technical characteristics of a automatic identification system that will introduce in aviation and marine radio stations. 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, AIS will become a mandatory carriage requirement by 01 July 2002. AIS as a surveillance system continuously receives its own position from the GNSS and then repeatedly broadcasts it on a W:.u data link for avoiding traffic conflicts and possible disasters. VHF data link is organized so that a specified number of time slots make up a repeatable frame. Each radio station can autonomously allocate and deallocate slots within the frame using selection algorithm which is called SOTDMA(Self-Organized Time Division Multiple Access). The results can be an aid in the continued of understanding technical characteristics for AIS as a broad surveillance system.

A Study on Automatic Surveillance System using VHF Data Link Protocol (해상이동통신에서 VHF 데이터링크 프로토콜을 이용한 자동감시시스템 연구)

  • 장동원
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.11a
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    • pp.187-191
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    • 2002
  • In this paper, We analysed the technical characteristics of a automatic identification system that will introduce in aviation and marine radio stations. 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, AIS will become a mandatory carriage requirement by 01 July 2002. AIS as a surveillance system continuously receives its own position from the GNSS and then repeatedly broadcasts it on a VHF data link for avoiding traffic conflicts and possible disasters. VHF data link is organized so that a specified number of time slots make up a repeatable frame. Each radio station can autonomously allocate and deallocate slots within the frame using selection algorithm which is called SOTDMA(Self-Organized Time Division Multiple Access). The results can be an aid in the continued of understanding technical characteristics for AIS as a broad surveillance system.

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