共查询到20条相似文献,搜索用时 93 毫秒
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在第四次工业革命中,工业产品经历了从机械产品到机电一体化产品、智能互联产品、产品系统和系统之系统的演变过程[1],产品复杂性不断增加,应用场景日益丰富,同时对可靠性和安全性的要求也越来越高。由于复杂系统组成元素多、元素交互多、多学科耦合和软件密集等特点,其可靠性评估在模型确定、数据融合和可靠性综合等方面困难重重。随着技术的发展,尽管蒙特卡洛方法、贝叶斯方法 (Bayes)和金字塔式综合评估等复杂系统的可靠性评估方法在工程上得到了一定的应用,但也难以完全解决小子样、多层级、高可靠复杂系统评估精度和评估效率问题。在理清复杂系统通用可靠性评估技术发展脉络的基础上,重点针对多状态系统、多失效模式系统和可修系统等复杂系统的可靠性评估的国内外研究现状进行梳理,分析了存在的不足,探讨了未来技术的发展趋势。 相似文献
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本文提出了基于等效电磁端口模型的系统电磁兼容性能评估方法;并在此基础上提出了基于确定性特征的评估准则和基于统计特征的评估准则。 相似文献
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数据融合技术是多传感器信息系统的核心技术,为了客观、全面、有效地评估数据融合系统性能,提出、建立了一套较完善的融合评估方法。首先,介绍数据融合的几项评估指标;其次,详细描述各指标定义及计算方法;各指标权重设置要求、特殊场景权重设置建议;各项评估指标百分比集成归一化计算方法;最后,通过仿真实例进一步印证评估方法有效性。文中的融合评估方法已经在课题和工程中得以实现与应用,表明该评估方法是可实现的、有效的,对构建多传感器数据融合评估体系有一定的参考价值。 相似文献
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Network survivability is crucial to both unicast and multicast traffic. Up to now, extensive research has been done on unicast
traffic protection. Recently, due to the rapid growth of multicast applications, such as video-conferencing, high definition
television (HDTV), distance learning, and multi-player on-line gaming, the problem of multicast traffic protection has started
to draw more research interests. The preconfigured protection cycle (p-cycle) method proposed by Grover offers fast speed in restoration (because p-cycles are pre-cross-connected) and high efficiency in resource utilization (because p-cycles protect both on-cycle and straddling links). So far p-cycles based protection approaches have been intensively studied for unicast traffic protection, but have been rarely investigated
for multicast traffic. We propose to apply p-cycles to dynamic protection provisioning of multicast traffic, and evaluate the blocking performance in comparison to other
existing multicast protection schemes. We consider three different p-cycle based multicasting protection methods, namely dynamic p-cycle (DpC) design, p-cycle based protected working capacity envelope (PWCE) design, and hybrid DpC and PWCE design. We show that p-cycle-based multicast protection approaches offer much better blocking performance, as compared with other existing multicast
protection schemes. The main reasons for the much better blocking performance are attributed to the facts that (i) the selection
of p-cycles is independent of the routing of the multicast light trees, (ii) there are no path/segment disjoint constraints between
the selected p-cycles and the multicast light trees to be protected, (iii) the selected p-cycles are the most efficient p-cycles.
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Wen-De ZhongEmail: |
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Yue Wu Chunlei Shi Xiaohui Ding Mohammed Ismail Håkan Olsson 《Analog Integrated Circuits and Signal Processing》2002,33(3):239-248
In this paper, a class of CMOS biquadratic filter suitable to work at VHF/RF frequency range is presented. The proposed circuit has a simple structure which is analyzed and designed according to a universal G
m-C biquad filter. Simulation and experimental results show that these filters can work in GHz range and have wide tuning range. 相似文献
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随着信息技术的发展,信息系统面对的安全问题越来越突出,这引起了社会的广泛关注。而对信息系统安全的风险进行评价,是对信息系统安全保护的重要体现。首先对信息系统安全风险评估涉及到的4个基本因素进行了阐发。虽然针对风险评估的方法有很多种,但这里在构建信息系统安全风险评估指标的基础上,运用层次分析法(AHP)和模糊综合评判对风险进行了有效评估,为信息系统安全风险的管理决策提供了科学依据。 相似文献