• Title, Summary, Keyword: CW synchronization

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Optimal CW Synchronization Scheme in IEEE 802.11 WLANs (IEEE 802.11 WLAN 환경에서 최적의 CW 공유 방안)

  • Lee, Jin-Lee;Lee, Su-Bin;Kyung, Yeunwoong
    • Journal of The Korea Internet of Things Society
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    • v.6 no.4
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    • pp.15-19
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    • 2020
  • In this paper, we propose a optimal CW(Conention Window) synchronization scheme in IEEE 802.11 WLANs. IEEE 802.11 WLANs support DCF(Distributed Coordination Function) mode for the MAC(Medium Access Control) operation. In DCF, the CW increases exponentially according to the collisions and becomes minimum CW according to the success of data transmissions. However, since the base minimum CW value is hardware or standard specific, the number of active stations and network status are not considered to determine the CW value. Even though the researches on optimal CW have beend conducted, they do not consider the optimal CW synchronization among mobile stations which occur network performance degradation. Therefore, this paper calculates the optimal CW value and shares it with mobile stations in the network.

A study on the emotional identification lighting of AtoN facility by LED (LED에 의한 항로표지 시설의 감성식별 조명에 대한 연구)

  • Oh, Jin-Seong;Choi, Jo-Cheon
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.145-147
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    • 2010
  • This study is the visually emotional identification lighting for easy to distinguish using 3colors LED on AtoN facility in shore and harbor, which have realized a controller for certainly express the mouth of a harbor by red light and green light of both sides a harbor and for synchronization at a time of right and left or serial sequential the harbor guidance light through synchronizer or timer by GPS. There is expectation effect that is prevent a confusion about distinguish of facility by ship's operator and to beautify a night scene of harbor, which is expressed to emotional identification lighting differ from great many lighting of harbor with variable color lighting the lighthouse body and vertical layer color lighting using LED. The function of AtoN is adapted that guidance light through synchronization or serial sequential lighting and display of harbor safety message by CW lighting, and this system is the power consumption greatly reduce by candle alternated high light LED.

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A study on the LED lighting for aids to identification of AtoN at night (야간의 항로표지 식별을 지원하는 LED 조명의 연구)

  • Oh, Jin-Seong;Jang, Chul-Woo;Choi, Jo-Cheon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.689-691
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    • 2010
  • This study is the visually identification lighting for easy to distinguish using colors LED on AtoN facility in harbor gate, which have realized a controller for certainly express the gate of harbor by red light and green light of both sides a harbor and for synchronization at a time of right and left or sequential the harbor guidance light through synchronizer or timer by GPS. There is expectation effect that is prevent a confusion about distinguish of facility by ship's operator and to beautify a night scene of harbor, which is expressed to identification lighting differ from great many lighting of harbor with variable color lighting the lighthouse body and vertical layer color lighting using LED. Especially the function of AtoN is displayed for harbor safety message by CW lighting, and this system is the power consumption greatly reduce by candle alternated high light LED.

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