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构建中国时空体系保障时空信息安全服务的探讨 被引量:5
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作者 施闯 张雨露 +1 位作者 辜声峰 景贵飞 《导航定位学报》 CSCD 2023年第6期1-7,共7页
为保障时空信息的高可信、高安全和自主可控,对保障时空信息安全服务进行研究:提出一种通信导航融合的时空网络体系;并探讨构建中国时空系统的架构。研究结果表明,通过中国时空网络实现通信即增强的时空服务,既可以为用户提供高精度、... 为保障时空信息的高可信、高安全和自主可控,对保障时空信息安全服务进行研究:提出一种通信导航融合的时空网络体系;并探讨构建中国时空系统的架构。研究结果表明,通过中国时空网络实现通信即增强的时空服务,既可以为用户提供高精度、高可信的时空服务,又能够保障国家时空信息的安全。 展开更多
关键词 时空 中国时空体系 时空信息安全 定位导航授时(PNT) 通导融合
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Spatio-temporal Dynamic Patterns of Rural Area Development in Eastern Coastal China 被引量:4
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作者 LIU Yansui WANG Guogang ZHANG Fugang 《Chinese Geographical Science》 SCIE CSCD 2013年第2期173-181,共9页
The aim of this study is to evaluate the current state of rural area development at the county level in the eastern coastal China. An evaluation index system including 18 factors was developed, and a rural development... The aim of this study is to evaluate the current state of rural area development at the county level in the eastern coastal China. An evaluation index system including 18 factors was developed, and a rural development index (RDI) was constructed to evaluate rural development state in 2000, 2004, and 2008. The quantitative evaluation indicated the following results. 1) This study derived four dominating components by means of principal component analysis, which can explain 78.2% of the total information, namely agricultural production input, the basic condition of agriculture, the comparative effectiveness of grain production, and the household′s own basic conditions. 2) Since the turn of the new millennium, the rural area in the eastern coastal China has experienced a rapid development in general. Well developed, developed, moderately developed and undeveloped rural areas respectively occupied 29.32%, 22.33%, 21.91%, and 10.51% in 2008. 3) The countryside had maintained a sound momentum of developing trend between 2000 and 2008, while the rural development in the eastern coastal China lacked sustainability. And 4) industrialization, urbanization, original economic basis, and location are four major driving forces of the disparity of rural area development in the eastern coastal China. Given these results, the strategies and policies for the improvement of each rural group were put forward. 展开更多
关键词 rural area development rural development evaluation new countryside construction eastern coastal China
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