排序方式: 共有102条查询结果,搜索用时 15 毫秒
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CARD/1软件系统是专门用来解决工程设计中技术难题的软件,具有更加开放的平台,能很好的进行二次开发,提高设计质量和效率。介绍了该软件基于改扩建项目的二次开发应用。 相似文献
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二级公路是我国公路系统的重要组成部分。本文根据现场观测结果,以二级公路交通流特性为基础,比较传统安全评价方法,采取基于第85位运行速度差的方法评价二级公路的安全性。考虑二级公路交通组成复杂的特点,运用交通仿真技术建立路网对象,结合现场观测数据完成参数标定,模拟实际交通流运行状况,输出评价指标数据,提出了区别于《公路项目安全性评价指南》所述获取运行速度差的方法。实例研究表明,该方法简单易用、精度较高,且适用范围广。 相似文献
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A novel clock structure of a low-power 16-bit very large instruction word (VLIW) digital signal proces- sor (DSP) was proposed. To improve deterministic clock gating and to solve the drawback of conventional clock gating circuit in high speed circuit, a distributed and early clock gating method was developed on its instruction fetch &. decoder unit, its pipelined data-path unit and its super-Harvard memory interface unit. The core was im- plemented following the Synopsys back-end flow under TSMC (Taiwan Silicon manufacture corporation) 0.18-μm 1.8-V 1P6M process, with a core size of 2 mm × 2 mm. Result shows that it can run under 200 MHz with a power performance around 0.3 mW/MIPS. Meanwhile, only 39.7 % circuit is active simultaneously in average, compared to its non-gating counterparts. 相似文献
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介绍了城市轨道交通电力监控系统及其高实时性要求;通过对比分析,得出了适宜于城市轨道交通电力监控系统的时钟同步方式. 相似文献
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沙玉林 《铁路通信信号工程技术》2012,9(3):34-37,63
介绍铁路通信时钟同步网的现状,分析其存在的问题,对同步网的相关技术进行研究,提出铁路通信同步网PRC、LPR的节点布置. 相似文献
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Secondary crash (SC) occurrences are non-recurrent in nature and lead to significant increase in traffic delay and reduced safety. National, state, and local agencies are investing substantial amount of resources to identify and mitigate secondary crashes in order to reduce congestion, related fatalities, injuries, and property damages. Though a relatively small portion of all crashes are secondary, their identification along with the primary contributing factors is imperative. The objective of this study is to develop a procedure to identify SCs using a static and a dynamic approach in a large-scale multimodal transportation networks. The static approach is based on pre-specified spatiotemporal thresholds while the dynamic approach is based on shockwave principles. A Secondary Crash Identification Algorithm (SCIA) was developed to identify SCs on networks. SCIA was applied on freeways using both the static and the dynamic approach while only static approach was used for arterials due to lack of disaggregated traffic flow data and signal-timing information. SCIA was validated by comparison to observed data with acceptable results from the regression analysis. SCIA was applied in the State of Tennessee and results showed that the dynamic approach can identify SCs with better accuracy and consistency. The methodological framework and processes proposed in this paper can be used by agencies for SC identification on networks with minimal data requirements and acceptable computational time. 相似文献
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文章对公路建设及营运的环境问题进行分析,提出了提高环境意识与健全制度、强化环境监督管理、制定工程与技术措施等对策建议,为相关部门防治公路环境问题提供参考。 相似文献
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张海泉 《武汉船舶职业技术学院学报》2013,(3):72-74
摘要中高职课程衔接,是中高职教育衔接研究中的一个重要课题。本文分析了建构中高职衔接的船体放样课程标准的思路和方法。并设计出适合统招和单招的中高职学生学习的船体放样课程标准,列出了具体的、有针对性的学习情境。 相似文献