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基于高斯密度谱估计的局域中心网络流量预测 被引量:3
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作者 代秀珍 《科技通报》 北大核心 2015年第12期80-82,共3页
局域中心网络流量具有高斯宽带信号特征,传统的窄带信号处理方法难以实现有效准确的流量预测。提出一种基于高斯密度谱估计的局域中心网络流量准确预测算法。构建流量预测模型,进行流量时间预测的信号采集和特征提取,对采集的信号特征... 局域中心网络流量具有高斯宽带信号特征,传统的窄带信号处理方法难以实现有效准确的流量预测。提出一种基于高斯密度谱估计的局域中心网络流量准确预测算法。构建流量预测模型,进行流量时间预测的信号采集和特征提取,对采集的信号特征进行高斯密度谱特征估计,对高斯密度特征旋转角度扫描,求网络流量信号的频率轴上投影尺度,判断峰值是否超过门限实现流量预测。仿真结果表明,采用该算法进行流量预测,高斯密度谱的聚集性较好,精度较高,性能优越。 展开更多
关键词 流量预测 局域中心网络 宽带信号 谱估计
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局域性脑卒中中心网络的建设对提高区域内急性缺血性脑卒中救治能力的作用分析
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作者 欧阳升 刘忠玲 +1 位作者 张志江 韦婧婧 《智慧健康》 2021年第23期30-32,共3页
目的探讨局域性脑卒中中心网络的建设在提升区域内急性缺血性脑卒中救治水平中的价值。方法我市成立脑卒中中心网络平台后,收集中心网络运行前后期间在我院就诊的急性缺血性脑卒中患者的临床资料。对比网络平台建立前后综合卒中中心收... 目的探讨局域性脑卒中中心网络的建设在提升区域内急性缺血性脑卒中救治水平中的价值。方法我市成立脑卒中中心网络平台后,收集中心网络运行前后期间在我院就诊的急性缺血性脑卒中患者的临床资料。对比网络平台建立前后综合卒中中心收治的急性缺血性脑卒中患者静脉溶栓率、血管内介入治疗率。结果脑卒中中心网络运行后,综合卒中中心收治的急性缺血性脑卒中患者静脉溶栓率及血管内介入治疗率均较运行前显著提升,差异有统计学意义(P<0.05);网络运行前,综合卒中中心静脉溶栓患者共151例,运行后静脉溶栓患者共261例,两组患者年龄、性别、前循环梗死比例对比差异无统计学意义(P<0.05);网络运行后,综合卒中中心静脉溶栓DNT缩短,溶栓后NIHSS评分降低,溶栓90d后神经功能良好率升高,出血转化率下降,差异有统计学意义(P<0.05)。结论局域性脑卒中中心网络的建设与运行有效提升了本区域对急性缺血性卒中救治水平,可缩短急性缺血性卒中患者的救治时间,改善其预后。 展开更多
关键词 缺血性脑卒中 局域性脑卒中中心网络 救治水平
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An Empirical Study on Chinese City Network Pattern Based on Producer Services 被引量:17
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作者 ZHEN Feng WANG Xia +1 位作者 YIN Jun ZHANG Min 《Chinese Geographical Science》 SCIE CSCD 2013年第3期274-285,共12页
Globalization and informatization have accelerated city networking process over the world, which makes research on city network a hot topic in the fields of urban geography and economic geography. With Chinese economi... Globalization and informatization have accelerated city networking process over the world, which makes research on city network a hot topic in the fields of urban geography and economic geography. With Chinese economic structure adjustment and city economic growth, producer services have begun to play an increasingly important role in city-region networking. This paper employs the methodology of world city network to analyze and explain the spatial development characteristics of China's urban network system based on the data of nationwide producer services enterprise network. The research result indicated that the distribution of producer services network has a positive effect on the development of Chinese city networks. City network connectivity is closely related to the significance of city in producer services development, and the former will gradually decline with the drop of the latter. Accordingly, the 64 cities can be divided into the national central cities, regional central cities, sub-regional central cities and local central cities in accordance with their position and role in the nationwide producer services network. It is concluded that high-grade cities with quality producer services dominate the pattern of Chinese city networks and there emerges three spatial agglomerations of producer services enterprises in Changjiang (Yangtze) River Delta, Zhujiang (Pearl) River Delta and Beijing-Tianjin-Tangshan Economical Region. Moreover, the distribution of different producer services industry varies from city to city, which also affects the characteristics of network development. 展开更多
关键词 world city network producer services urban hierarchy network connectivity Chinese city network
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