排序方式: 共有13条查询结果,搜索用时 15 毫秒
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Tsai Pei-Wei Li Jian-Pan Shih Jia-Shing Chen Yin-Jun Lee Tung-ying Cheng Sheng-Tzong 《Telecommunication Systems》2020,75(2):221-234
Telecommunication Systems - Vehicle-to-vehicle communication and probabilistic broadcast are important means for information dissemination in vehicular ad-hoc networks (VANETs). In contrast to... 相似文献
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作为一种新型河工建筑物,桩式丁坝对水流及河床的影响亟需可靠的定量研究。为此,在前人研究的基础上,结合室内试验,分析了正挑桩式丁坝区域水流特性及其冲坑特征。采用叠加水头损失的方法并以此建立能量方程式,得出桩式丁坝壅水高度的计算公式。在此基础上,通过进一步理论分析,结合试验验证,对桩式丁坝局部冲刷深度进行了探讨。首先建立了坝头水流叠加模式,进而得出了坝轴断面的流速分布式,并推导出了正挑桩式丁坝局部最大冲刷深度的理论计算公式。所建立的壅水高度和最大冲刷深度计算公式具有清晰的数学模式和明确的物理意义,并得到了室内试验的验证,可为工程设计提供技术依据。 相似文献
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超声速点火和燃烧是超燃冲压发动机研究中的一项关键技术。论文总结了国内外在碳氢燃料的等离子体点火助燃方面研究进展,重点列举了国外在裸电极直接点火和喷注等离子体火炬两种等离子体点火方式的实验与数值研究,以便于我国的科研工作者与国际同行开展国际合作与学术交流。 相似文献
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Wireless Personal Communications - Currently, websites provide web services to people for expressing their feelings and promoting their relationship with friends. The web service allows people to... 相似文献
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所设计的变工况机械密封实验台是一套模拟机械密封工作状况的实验设备,能够模拟密封各种正常工况及变工况工作情况。根据具体实验要求,变工况机械密封实验台测试系统具有测量温度、压力、位移、转矩、转速等工作参数的能力;其相应的软件系统应该具有一定的数据储存和处理能力,装置能够模拟机械密封变工况工作,通过实验装置实验的抗变机械密封成功应用于工业企业。 相似文献
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本文给出了MATLAB环境下线性系统的Bode图、Nyquist图、Nichols图的绘制方法,为线性控制系统的频域分析提供了一种简单有效的途径。 相似文献
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Sheng-Tzong Cheng Yin-Jun Chen Gwo-Jiun Horng Chi-Hsuan Wang 《Wireless Personal Communications》2013,73(3):441-461
Tourist navigation systems have become an important area of research because they help people increase the quality of their travel. This work proposes an adaptive recommendation mechanism that relies on a congestion-aware scheduling method for multiple groups of travelers on multi-destination trips. The recommendation scheme uses the cell (number of groups) mechanism of the cellular automata model for group system distribution. To reduce congestion while visiting multiple destinations, we present a tour group with adaptive recommendations from a system to yield a high quality tour experience. When faced with congestion, the system proposes a path by which the group visits a secondary destination first and then visits the primary destination. Simulation results reveal the strengths of the proposed “adaptive recommendation mechanism” model in terms of decreasing the average wait time, congestion, and the ratio of congestion avoidance to the number of groups. 相似文献