• Title/Summary/Keyword: digital communication

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Design Methodologies of High-speed Communication System with Signal Integrity (고속통신시스템의 신호충실성을 고려한 신호경로 설계 방법)

  • 박종대;박영호;남상식
    • Proceedings of the IEEK Conference
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    • 2000.11a
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    • pp.279-282
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    • 2000
  • As digital systems continue to use components with faster edge rates and clock speeds, transmission of the digital information in these systems approaches the microwave realm. At these speeds digital signal fidelity becomes both a critical success factor and design challenge. The noise sources in digital systems include the noise in power supply, ground and packaging media due to simultaneous switching of drivers, signal reflections and distortions on single and multiple transmission lines. This paper presents theory, case studies and design considerations of gigabit interconnection for network and communication systems. The case studies show HSPICE and Ampredictor simulations of alternate approaches. Various subjects including skin effect and dielectric losses, interconnect simulations and crosstalks of connector, affected signal discontinuity, are addressed.

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A Hybrid Encryption Technique for Digital Holography using DCT and DWT

  • Choi, Hyun-Jun;Seo, Young-Ho;Kim, Dong-Wook
    • Journal of information and communication convergence engineering
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    • v.9 no.3
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    • pp.271-275
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    • 2011
  • In this paper, we present a hybrid encryption for a digital hologram which is the most valuable image content. The encryption algorithm is based on a hybrid technique implementation a four-dimensional transform combining the discrete wavelet transform(DWT) and the discrete cosine transform (DCT). The encryption scheme is composed on the basis of the energy distribution. The experimental results showed that encrypting only 0.0244% of the entire data was enough to hide the constants of the hologram. The encryption algorithm expected to be used effectively on the researches on encryption and others for digital holographic display.

Implementation of Wireless Remote Controller for Welders using RF Communication (RF 통신을 이용한 용접기용 무선 리모콘의 실현)

  • Oh, Joon-Tae;Kim, Gyu-Sik
    • Proceedings of the KIPE Conference
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    • 2009.11a
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    • pp.243-245
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    • 2009
  • In this paper, wireless remote controller for welderss are implemented using RF communication. It can be used for general welding power sources. Sometimes, wireless remote controllers for welders are needed because welding torches are far away from welding sources in the case of big ship-building or big tank constructions. In order to use the wireless remote controllers, digital cpu-based welding systems are essential for digital interfaces. But, in this paper, using digital resistors makes wireless remote controllers be easily applied to digital or analog welders. To demonstrate the practical significance of our results, some experimental results are presented.

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Data-Hiding Method using Digital Watermark in the Public Multimedia Network

  • Seo, Jung-Hee;Park, Hung-Bog
    • Journal of Information Processing Systems
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    • v.2 no.2
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    • pp.82-87
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    • 2006
  • In spite of the rapid development of the public network, the variety of network-based developments currently raises numerous risks factors regarding copyright violation, the prohibition and distribution of digital media utilization, safe communication, and network security. Among these problems, multimedia data tend to increase in the distributed network environment. Hence, most image information has been transmitted in the form of digitalization. Therefore, the need for multimedia contents protection must be addressed. This paper is focused on possible solutions for multimedia contents security in the public network in order to prevent data modification by non-owners and to ensure safe communication in the distributed network environment. Accordingly, the Orthogonal Forward Wavelet Transform-based Scalable Digital Watermarking technique is proposed in this paper.

Design of the High Speed Variable Clock Generator by Direct Digital Synthesis (DDS 방식에 의한 고속 가변 클럭 발생기의 설계)

  • 김재향;김기래
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2000.10a
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    • pp.176-179
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    • 2000
  • The PLL synthesizer is used often in communication system due to several merits, such as broad bandwidth, high accuracy and stability of frequency. But it is difficult to use in current digital communication systems that need frequency hopping at a high speed because of its long frequency hopping time. In this paper, we designed frequency synthesizer that generate the clock frequency randomly at a high speed using the DDS technology and is applied to the pattern generator systemfor for digital image.

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Study on Museum Digital Exhibition Mode and Industrialization of Intangible Cultural Heritage

  • Bai, Jian-Song;Boo, Jong-Chul
    • Journal of information and communication convergence engineering
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    • v.9 no.2
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    • pp.129-134
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    • 2011
  • Nowadays, most of exhibits are material antiquities while the exhibit of intangible cultural heritage is deficient and the form is less advanced which cannot meet the exhibition needs of digital times. This has resulted in insufficient display of intangible heritage's value which may not facilitate inherit and protection of intangible heritage, no other than protection mechanism of forming healthy industrialization. This article has established digital exhibition mode in museum about intangible cultural heritage by analysis on current museum and using mobile communication and augmented reality techniques. Discuss the mode in the layer integrating creative industry and mobile industry and provide practicable reference project of forming the healthy industrialization mechanism for protecting intangible heritage.

New Fashion Industry Trend Corresponding to New Media & Internet Infrastructure (뉴미디어 및 인터넷 시대에 부응하는 패션산업의 새로운 동향)

  • 김수진;한명숙
    • The Research Journal of the Costume Culture
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    • v.10 no.3
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    • pp.293-305
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    • 2002
  • This paper describes the new trends of fashion industry in the era of digital media and Internet paradigm, where fashion is no longer just static contents. Fashion becomes crucial and dynamic contents for infotainment, mobile Internet, and digital media. As therefore, the fashion industry could be positioned as fashion information industry and key elements of fashion communication. In the future, fashion education should be repositioned as dynamic Intermediary not only for traditional textile design, costume design, and merchandising, but also for dynamic fashion information provider, fashion communication and fashion-oriented media related to digital Information, and Internet. As a case study, we briefly describe the successful co-marketing strategies of world-class luxury fashion brands, fashion media, and Internet service provider.

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Taining Kit for Xilinx FPGA or ALTERA CPLD Digital Logic Design with Center Bridge Chipset Architecture (중앙 브릿지 칩셋을 갖춘 Xilinx FPGA, ALTERA CPLD 겸용 Digital Logic Design Training kit)

  • 전상현;정완영
    • Proceedings of the IEEK Conference
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    • 2003.07b
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    • pp.907-910
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    • 2003
  • We have developed Logic Design Training Kit for studying, actual training, designing of FPGA(Xillinx) or CPLD(ALTERA CPLD), the Digital Logic Device. This training kit has 12 matrix keys, RS232 port for serial communication and uses LED array. six FND(Dynamic), LCD as display part. That is standard specification for digital logic training kit. Special point of this kit is that we make two logic device trainig kit. This two logic device kit have more smaller and simple architecture because only uses one chip. That chip already includes a lot of functions that need for training kit, such as : complex logic circuit needed the two kind of logic devices, 16 way of system clock deviding function, serial communication interrupt....etc. We called that one chip is Center Bridge Chipset ; Xillinx FPGA Spartan2. User can select between using one device of FPGA or CPLD, or uses both them. Because of, Center Bridge Chipset has profitable architecture. it can work as Logic Device's networking with Master-Slave connection When using both logic devices.

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A design of an improved GMSK quadrature modulator for digital cellular system (디지털 셀룰라 시스템을 위한 개선된 GMSK 직교 변조기의 설계)

  • 송영준;한영열
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.33A no.6
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    • pp.32-41
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    • 1996
  • We propose the improved GMSK (gaussian-filtered minimum shift keying) quadrature modulator using the FIR(finite impulse response )filter whose coefficients are obtained form the differnce of phase response, and design its ASIC (applicaton specific integrated circuit) which can be used for GSM (global system for mobile communication) digital cellular system and DCS 1800 (digital cellular system at 1800MHz) personal communication system. Input data become quantized I and Q channel 10 bit signal through cosine and sine ROM mapping after being filtered by the FIR filter whose normalized bandwidth is 0.3 and designed by considering intersymbol interference as well as sampling ratio. These two signals become the GMSK modulated I and Q channel signal through DAC (digital-to-analog converter) and 7th order analog chebyshev LPF(low pass filter) respectively. The difference between the ideal analog signal and its digitized signal is analyzed in terms of sampling noise, quantization noise, truncation noise and coefficient noise. And the effect of the LPF following the DAC is considered. The ASIC design of the GMSK quadrature modulator is also confirmed by an experiment.

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Design of the High Speed Variable Clock Generator by Direct Digital Synthesis (DDS 방식에 의한 고속 가변 클럭 발생기의 설계)

  • 김재향;김기래
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2001.05a
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    • pp.443-447
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    • 2001
  • The PLL synthesizer is used often in communication system due to several merits, such as broad bandwidth, high accuracy and stability of frequency. But it is difficult to use in torrent digital communication systems that need frequency hopping at a high speed because of its long frequency hopping time. In this paper, we designed frequency synthesizer that generate the clock frequency randomly at a high speed using the DDS technology and is applied to the pattern generator system for digital image.

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