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In this paper factors affecting accuracy of time synchronization in EPON are analysed and the scheme of time synchronization in EPON based on IEEE1588v2 protocol is designed and implemented by FPGA. Experimental result shows that the scheme is feasible and good time synchronization accuracy about 20 nanoseconds can be reached.
P2P protocol is widely used in many network applications. Recently, p2p traffic reserves a big part of total access bandwidth and may cause serious problems in EPON. In this paper, a new method to identify the p2p traffic based on the flow ID (five-tuple) is presented. We analyze the factors that influence identification accuracy, and then simulate accurate rate of the new method according to the...
In this paper, an improved support vector machines recursive feature elimination (SVM-RFE) approach for feature selection of hyperspectral data is proposed. An automatic model selection (AMS) algorithm using radius margin bound is integrated into the process of feature selection before feature ranking, and the ranking criterion used by standard SVM-RFE is replaced with a new criterion derived from...
In this paper, the Mallat algorithm of wavelet transformation is adopted to determine the deflection point of the temperature curve in the dew-point auto-detection instruments. By this method, the useful signal can be effectively extracted out of intensive background noise, and highly repeatable value of the deflection point can be obtained in only 3-5 measurements. Compared with the traditional method,...
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