Z-MAC协议改进算法     

卢玫欣  苏胜君  施伟斌  乐燕芬  李瑞祥 《教育技术导刊》2017,16(12):78-80

为改善Z-MAC协议在不同网络流量下的表现,通过对Z-MAC协议的分析,在该协议原有退避算法基础上,提出了一种基于流量的自适应退避算法。相对于原有算法固定长度的退避窗口,该算法可以根据网络流量的变化动态调整退避窗口的大小,从而提高了协议的灵活性。通过NS2.26软件仿真分析,实验结果表明,该算法在吞吐量、丢包率、延迟等多个方面均优于原有算法。基于流量的自适应退避算法可有效改善Z-MAC协议的性能。  相似文献   

基于奇异值测度和颜色纹理的图像块特征向量     

王朔中  路兴  苏胜君  张新鹏 《上海大学学报(英文版)》2007,11(3):205-209

In this work, image feature vectors are formed for blocks containing sufficient information, which are selected using a singular-value criterion. When the ratio between the first two SVs are below a given threshold, the block is considered informative. A total of 12 features including statistics of brightness, color components and texture measures are used to form intermediate vectors. Principal component analysis is then performed to reduce the dimension to 6 to give the final feature vectors. Relevance of the constructed feature vectors is demonstrated by experiments in which k-means clustering is used to group the vectors hence the blocks. Blocks falling into the same group show similar visual appearances.  相似文献   

课堂教学模式中若干问题的分析与探讨     

苏胜君  乐燕芬  唐春晖 《科教文汇》2008,(22):60-61

审美教育是音乐教育的核心部分,它培养学生对美好音乐的热爱,帮助他们树立正确的审美观,养成健康向上的审美情趣,并能起到启迪智慧、净化心灵、陶,台情操等作用,然而我国当前的音乐教育中审美教育并没得到很好的贯彻。这就严重违背了音乐教育要“以音乐审美为核心”这一基本理念,针对当前现状,本文对音乐审美教育的改革问题作了一些有益的探讨。  相似文献