• Title/Summary/Keyword: Point-to-Point

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Data Transmission Specific Simulation of Transmission Line using HSTL (HSTL을 이용한 전송선로에서의 데이터 전송특성 시뮬레이션)

  • Kim, Soke-Hwan;Hur, Chang-Wu
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.15 no.8
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    • pp.1777-1781
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    • 2011
  • Tosin backplane system design of this study (Backplane) from the HSTL (High-Speed Transceiver Logic) characteristics of the transmit and receive data using the HSPICE simulations and the actual implementation on the FPGA Data transmission characteristics were described by comparing the simulation results. Simulation and measurement criteria for point to point data transmission characteristics of wire length possible to send and receive data about the speed limits were reviewed. Measured point to point connection to send and receive signals at terminal velocity, the factors that affect the electrical noise around the wire length and showed a very important role.

Point-to-Point Communication of Cognitive Radios via Underlay Spectrum Sharing (언더레이 주파수 공유를 이용한 인지무선 통신장치의 점대점 통신방법)

  • Lee, Hye-Won;Han, Kwang-Hun;Hwang, Young-Woo;Choi, Sung-Hyun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.9A
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    • pp.697-703
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    • 2009
  • Cognitive radios are typically known to exploit vacant spectrum resources in order not to interfere with primary communication systems. However, cognitive radios may not be able to secure a clear spectrum band in a bustling spectrum band. Underlay spectrum sharing provides a way to cope with such a spectrum sharing problem. Cognitive radios share the same spectrum band with the spectrum licensees, i.e., primary users, by adjusting signal transmission power so as not to severely deteriorate the performance of the primary users. We propose an underlay spectrum sharing policy leveraging uplink spectrum resource to be used in a cellular network. A pair of end terminals attempts to establish a direct point-to-point link, and perform as cognitive radios in the sense that they share the uplink radio resource of other primary users. We formulate the transmit power constraints of the cognitive radios and propose a practical uplink band sharing framework. Our simulation results demonstrate that such an uplink sharing underlay direct link can enhance the throughput performance of point-to-point link with low overhead.

A Variable Structure Point-to-Point Regulation Controller for Uncertain General Linear Systems (불확실 선형 시스템을 위한 적분 가변구조 지점에서 지점으로 레귤레이션 제어기)

  • Lee, Jung-Hoon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.4
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    • pp.519-525
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    • 2014
  • In this paper, an alternative variable structure controller is designed for the point-to-point regulation control of uncertain general linear plants so that the output of plants can be controlled from an arbitrarily given initial point to an arbitrarily given reference point in the state space. By using the error between the steady state value of the output and an arbitrarily given reference point and those integral, a transformed integral sliding surface is defined, in advance, as the surface from an initial state to an arbitrarily given reference point without the reaching phase problems. A corresponding control input is suggested to satisfy the existence condition of the sliding mode on the preselected transformed integral sliding surface against matched uncertainties and disturbances. Therefore, the output controlled by the proposed controller is completely robust and identical to that of the preselected transformed integral sliding surface. Through an example, the effectiveness of the suggested controller is verified.

Porting Point-to-Point Protocol(PPP) Software to an Embedded System (임베디드 시스템으로의 Point-to-Point Protocol(PPP) 소프트웨어 이식)

  • Choe, Seong-Jong
    • The Transactions of the Korea Information Processing Society
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    • v.7 no.7
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    • pp.2135-2148
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    • 2000
  • Developing network software in embedded systems, such as digital set-top boxes, requires coding under limited computing resources. This paper presents the porting of Point-to-point Protocol (PPP) software, PPPD, to an embedded system. The PPP is the most popular link layer protocol for the information appliance, to an embedded system. In order to achieve this, problems to be solved for the porting were identified and methods to solve the problems were described. First, PPP source codes were divided into modules. Next, functions of each module were analyzed and interfaces between the modules were delineated. With the analysis results, porting to the embedded system was described. The normal operation of the ported software was verified with the help of a network packet analyzer. Finally, experiences during the porting were presented. The method developed in th paper can be applied to the porting of software to an embedded system as well as the porting of network software.

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Point-to-point traffic demand optimization using trunk-group and office measurements (중계선군 및 국 총합 측정 데이타를 이용한 단대단 수요트래픽 추정 최적화 기법 연구)

  • 이선우
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • pp.317-326
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    • 1994
  • 본 논문은 통신망 설계/성능분석 및 동적라우팅(Dynamic Routing)등 통신망 제반 요소기술의 기초자료가 되는 단대단 수요트래픽의 최적값을 찾는 방법 에 관한 것으로, 기본 알고리듬은 ITC 13차에서 발표되어 속도가 빠르고 메 모리절약 기법이 뛰어난 것으로 평가되고 있는 PPDEA-HM(Point-to-Point Demand Estimation Algorithm using Hopfield Model)을 이용하였다. 이 알 고리듬은 망의 소통율에 따라 성능에 차이가 나므로 이 점을 보완한 MPPDEA-HM(Modified Point-to-Point Demand Estimation Algorithm using Hopfield Model)을 제안하며, 두 결과들이 variation을 비교하여 MPPDEA-HM의 특성이 보다 안정화되었음을 보였다.

A Study on the Limited Availability of the Link in a Communication Nework (Link의 한정이용도 상태에 대한 연구)

  • 김인재
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.7 no.4
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    • pp.173-176
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    • 1982
  • Point-to-point congestion, a criterion by which service quality in a communication network is estimated, Can be obtained by single moment method of analysis, point-to-point congestion can be computed by link blocking probability in turn is calculated by link offered traffic. Consequently, exact calculation of link offered traffic is vital to analysis of communication network. In this paper a fomula which facilitaties the calculation of link offered traffic in the limited available state of links, is derived.

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A Cost-effective 60Hz FHD LCD Using 800Mbps AiPi Technology

  • Nam, Hyoung-Sik;Oh, Kwan-Young;Kim, Seon-Ki;Kim, Nam-Deog;Kim, Sang-Soo
    • Journal of Information Display
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    • v.10 no.1
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    • pp.37-44
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    • 2009
  • AiPi technology incorporates an embedded clock and control scheme with a point-to-point bus topology, thereby having the smallest possible number of interface lines between a timing controller and column drivers. A point-to-point architecture boosts the data rate and reduces the number of interface lines, because impedance matching can be easily achieved. An embedded clock and control scheme is implemented by means of multi-level signalling, which results in a simple clock/data recovery circuitry. A 46" AiPi-based 10-bit FHD prototype requires only 20 interface lines, compared to 38 lines for mini-LVDS. The measured maximum data rate per data pair is more than 800 Mbps.

Analysis of Point-to-Point DC Fault by Type of DC Line and Pole (DC 선로와 Pole 방식에 따른 Point-to-Point HVDC 고장해석 기술방안 검토)

  • Kim, Kisuk;QINGLEI, GUO;Lee, Dongsoo;Jang, Gilsoo
    • Proceedings of the KIEE Conference
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    • pp.280-281
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    • 2015
  • DC 그리드가 실현되기 위해서는 이를 둘러싸고 있는 AC 시스템 간의 상호작용에 대한 이해가 필요하며, 차단기의 용량을 결정하거나 차단기를 동작시키기 위한 보호 계전기의 정정 등에 고장 전류값이 사용되기 때문에 사고 발생시 고장 전류에 대한 검토가 필요하다. 따라서, 본 논문에서는 DC 그리드의 내에서의 고장 전류 특성을 파악하기 위해 PSCAD/EMTDC를 이용하여 Point-to-Point VSC HVDC 그리드를 구성하여 Pole 상태 및 고장 종류에 따른 DC 그리드의 고장특성에 대한 연구를 수행하였다.

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DC Fault Study in Point-to-Point HVDC Grid based on MMC VSC (MMC VSC 기반 Point-to-Point HVDC Grid에서의 DC 고장 분석)

  • Lee, Dong-Su;Kim, Ki-Suk;Jang, Gil-soo
    • Proceedings of the KIEE Conference
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    • pp.161-162
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    • 2015
  • 최근 세계적으로 전력계통의 대륙 간 연계나 신재생에너지, 분산전원의 계통 연계를 위해 HVDC(High voltage Direct Current)에 대한 연구가 활발히 진행되고 있다. 대용량, 장거리 송전이 필요한 경우 HVAC에서의 전력손실과 송전거리의 한계를 극복하기 위하여 HVDC가 새로운 대안으로 떠오르고 있으며, LCC(Line commutated Converter)와 VSC(Voltage Source Converter)의 기술발전이 비약적으로 이뤄지고 있다. 특히, DC Grid화를 위해서 유럽에서는 해상풍력을 연계한 Windfarm을 DC Grid화 하는 프로젝트가 활발히 진행되고 있다. 이러한 신재생 에너지의 계통 연계를 위해서 DC Grid가 본격적으로 논의가 되고 있고 관련분야에서는 기술개발을 앞다퉈 진행하고 있는 상황이다. DC Grid 구현을 위해 VSC HVDC가 최근 주목받고 있으며, VSC로 연계된 DC Grid의 AC 계통과의 연계를 위해 가장 필요한 것이 바로 DC 차단기라고 할 수 있겠다. 본 논문에서는 DC Grid의 고장분석을 위한 기초연구로써 MMC(Modular Multilevel Converter) VSC를 기반으로 한 Point-to-Point HVDC Grid에서의 DC 고장에 대한 분석을 실시하였으며 그 특징을 분석하였다.

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A Study on Signal Transmission Specific Property HSTL of Backplane Processor (Backplane processor의 HSTL 신호전달 특성 연구)

  • 김석환;류광렬;허창우
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.355-358
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    • 2003
  • 본 문서는 백프레인(backplane)에서 프로세서 HSTL(High-speed Transceiver Logic)의 데이터 전송 및 수신 특성을 알아보기 위해 HSPICE를 사용하여 시뮬레이션을 하였으며 Xilinx Virtex II XC2V FF896 FPGA를 이용하여 직접 제작 신호 전달특성을 분석하였다. PCB(Printed Circuit Board)는 FR-4를 사용하였으며 point to point 배선 길이에 대해 데이터 전송속도 특성을 시험하였고 구현 가능한 데이터 전송 및 수신 한계 속도에 대해 검토하였다. 시험결과 point to point 접속 신호 전송 및 수신 한계속도에 영향을 주는 것이 배선 길이와 주변 전기적 잡음이 중요한 역할을 함을 알 수 있었다.

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