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因瓦条码水准尺检定方法 被引量:2
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作者 杨振 金挺 《测绘技术装备》 2021年第3期92-94,110,共4页
针对现有检定规程或者规范无法正确检定因瓦条码水准尺的问题,从国家有关标准对测量仪器示值误差的定义出发,推导了检定因瓦条码水准尺,分划线边缘分划精度、尺长改正数的计算公式;依据条码水准尺LD12的编码方法,在确定LD12每个条码的... 针对现有检定规程或者规范无法正确检定因瓦条码水准尺的问题,从国家有关标准对测量仪器示值误差的定义出发,推导了检定因瓦条码水准尺,分划线边缘分划精度、尺长改正数的计算公式;依据条码水准尺LD12的编码方法,在确定LD12每个条码的示值后,用水平比长器对该因瓦条码尺0.21.8 m范围、间隔为20 mm的条码分划线边缘进行检定,检定结果为:尺长改正数R=-27.0μm/m,条码边缘的分划精度(标准差)为5.8μm。 展开更多
关键词 条码水准尺 示值误差 分划精度 检定方法
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AN IMPROVED GN ALGORITHM OF NETWORK COMMUNITY DETECTION METHOD
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作者 WU Guodong SONG Fugen 《International English Education Research》 2017年第4期75-77,共3页
.GN algorithm has high classification accuracy on community detection, but its time complexity is too high. In large scale network, the algorithm is lack of practical values. This paper puts forward an improved GN alg... .GN algorithm has high classification accuracy on community detection, but its time complexity is too high. In large scale network, the algorithm is lack of practical values. This paper puts forward an improved GN algorithm. The algorithm firstly get the network center nodes set, then use the shortest paths between center nodes and other nodes to calculate the edge betweenness, and then use incremental module degree as the algorithm terminates standard. Experiments show that, the new algorithm not only ensures accuracy of network community division, but also greatly reduced the time complexity, and improves the efficiency of community division. 展开更多
关键词 Complex network Community detection Center node Improved GN algorithm
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