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今年世界电信和信息社会日的主题是"信息通信与女性",旨在呼吁大家筹措一切可用的资源,确保全世界女性均能全面获取ICT,从信息和知识中获取力量,了解自身权利,并把握数字机遇。女性是社会的基石、 相似文献
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随着政治经济科技等综合实力的不断增强,我国在国际信息通信技术(ICT)领域的标准竞争日益激烈。本文根据ICT标准竞争的本质,构建了ICT标准竞争的系统动力学模型,并对2000-2020年间中美标准竞争动态过程进行了仿真。研究表明,我国与美国标准水平的差距正在缩小,到2020年某些指标甚至将超越美国;为获得全球ICT领域的优势地位,我国政府应加大基础研究投入,着力引导企业提高关键技术的产业化水平,并营造使用"国货"的良好环境。 相似文献
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记者:据统计,在从事信息通信的专业人员中,女性比例不到20%。说明ICT行业是一个男性为主导的行业,在这样的行业中,您认为取得成功的关键是什么?即将进入ICT行业的年轻女性该如何发挥自己的优势?杨子真:ICT行业是一个发展很快、 相似文献
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信息需求催生"功能融合"
近年来,信息技术的进步催生了许多新事物,也带来了许多新发展,智能手机、网络视频、社交网站、平板电脑、物联网、智能电视、三网融合……在ICT产业诸多划时代发展背后的那只"无形的手"就是人类无尽的信息需求,以及这种需求层次的快速上升。 相似文献
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Lonnqvist A. Koskinen T. Hakli J. Saily J. Ala-Laurinaho J. Mallat J. Viikari V. Tuovinen J. Raisanen A.V. 《Antennas and Propagation, IEEE Transactions on》2005,53(10):3151-3159
A hologram-based compact antenna test range (CATR) is being developed to overcome challenges met in antenna testing at submillimeter wavelengths. For the first time, this type of CATR has been built for testing of a large reflector antenna at submillimeter wavelengths. The CATR is based on a 3-m computer-generated hologram as the focusing element. This paper discusses the design and the construction of the CATR, and the verification of the CATR operation with quiet-zone tests done for the CATR prior to the antenna testing. Assembly of the CATR, testing of the 1.5-m reflector antenna at 322 GHz, and the disassembly were all done within two months in 2003. The quiet-zone field measurement results are analyzed in this paper. The CATR was concluded to be qualified for antenna testing. The antenna testing is described in a separate paper. 相似文献
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Karttunen A. Ala-Laurinaho J. Vaaja M. Koskinen T. Hakli J. Lonnqvist A. Mallat J. Tamminen A. Viikari V. Raisanen A.V. 《Antennas and Propagation, IEEE Transactions on》2009,57(3):711-720
A hologram-based compact antenna test range (CATR) is designed, constructed, and used to test a 1.5-m antenna at 650 GHz. The CATR is based on a 3.16-m-diameter hologram as the collimating element. So far, this is the highest frequency at which any CATR has been used for antenna tests. The quiet zone is measured and optimized before the antenna tests. The measured antenna pattern results at 650 GHz are analyzed and compared to the simulated patterns. Feed scanning antenna pattern comparison technique is used to correct the antenna pattern. These tests show the hologram CATR to be promising for antenna measurements up to 650 GHz. 相似文献
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紧缩场是天线天线罩辐射特性、目标散射特性测试的重要设备,在使用前需要对其静区平面波幅度锥削、幅度波
纹及相位变化等电磁性能参数进行校准。紧缩场的静区性能校准离不开全频段的探头接收天线,校准天线的性能会影响紧缩
场静区电磁参数的校准结果。文中阐述了校准紧缩场静区性能的扫描法原理,利用本单位研制的紧缩场校准系统,在某研究
所的紧缩场环境内,比较了标准增益喇叭天线与超宽带双脊喇叭天线分别作为接收探头的差异。实验证明,设计完成的超宽
带双脊喇叭天线具有驻波低、增益适中、更换方便、频带宽等优点,完全可以替代六个波段标准增益喇叭天线的功能。 相似文献
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