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软件度量已成为一项基本的软件工程实践,借助作为软件度量成功实践之一的功能点分析方法构建起一套完整可行的软件度量体系,将有效地用于辅助改善软件工程的各个环节. 相似文献
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针对现有的离散生物启发神经网络(Glasius bioinspired neural networks, GBNN)算法在未知环境下,存在的路径规划时间长、易陷入局部最优等问题,提出一种结合A*与GBNN模型的改进算法。在GBNN活性值栅格网络中,算法将各栅格的活性值作为A*的代价函数进行运算并使用跳点搜索规则优化,实现未知环境下的实时路径规划。仿真实验结果表明,该算法有效改善了自主水下航行器在未知环境下的寻路效率,可以满足自主水下航行器实时路径规划需求。 相似文献
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In the field of Intelligent Transportation Systems (ITS), one of the most promising sub-functions is that of Advanced Driver Assistance Systems (ADAS). Development of an effective ADAS, and one that is able to gain drivers’ acceptance, hinges on the development of a human-like car-following model, and this is particularly important in order to ensure the driver is always ‘in the (vehicle control) loop’ and is able to recover control safely in any situation where the ADAS may release control. One of the most commonly used models of car-following is that of the Action Point (AP) (psychophysical) paradigm. However, while this is widely used in both micro-simulation models and behavioural research, the approach is not without its weaknesses. One of these, the potential redundancy of some of the identified APs, is examined in this paper and its basic structure validated using microscopic driving behaviour collected on thirteen subjects in Italy. Another weakness in practical application of the Action Point theory is the identification of appropriate thresholds, accounting for the perception, reaction and adjustment of relative speed (or spacing) from the leading vehicle. This article shows that this identification is problematic if the Action Point paradigm is analysed in a traditional way (car-following spirals), while it is easier if the phenomenon is analysed in terms of car-following ‘waves’, related to Time To Collision (TTC) or the inverse of TTC. Within this new interpretative framework, the observed action points can be observed to follow a characteristically linear pattern. The identification of the most significant variables to be taken into account, and their characterisation by means of a simple linear pattern, allows for the formulation of more efficient real-time applications, thereby contributing to the development and diffusion of emerging on-board technologies in the field of vehicle control and driver’s assistance. 相似文献
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文章基于点轴型区域经济发展理论、产业关联理论和产业生命周期理论,结合来宾市实际情况与来宾服务区的现有功能,探讨了来宾服务区开发商贸物流功能的必要性与优势。 相似文献
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国内外实时交通流数据质量控制比较与分析 总被引:2,自引:0,他引:2
交通流数据质量控制可以保证从数据源所获得数据的正确性和完整性,并为数据的管理和应用提供可靠的数据基础,虽然历史数据修正方法和交通流理论修正方法能够用于质量控制,但难以实现推广应用。根本原因在于前者需要大量历史数据,引发了存储上的困难;后者需要针对不同路段进行重复建模,模型通用性差,且准确性难以评价,鉴于此,本文首先研究并设计了基于线性插值法的道路交通流数据质量控制方法,该方法主要以时间点邻近数据为参考,对交通流参数和时间点分别进行判别修正,其优点在于不需要大量的历史数据,且适用性和可操作性强,其次,本文建立了实时交通流数据质量控制平台,针对北京市和美国圣安东尼奥市的数据进行质量控制处理,归纳总结出国内外实时交通流数据在质量控制前后的特征及差异,证明该方法能够有效的解决数据质量问题,最后,本文针对实时交通流数据质量控制方法的选取、交通探测器选择和配置等方面提出了建议。 相似文献
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分析西安铁路局多经战略装车点的基本现状,探讨建设战略装车点面临的机遇和优势及所面临的困难,最后,提出做好战略装车点建设工作的建议。 相似文献
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CTS2轨枕式转辙机在青藏线的应用 总被引:1,自引:0,他引:1
本文介绍了青藏线铁路的环境条件及对转辙机的使用要求,以及采用的CTS2轨枕式转辙机与我国铁路道岔的接口条件,并对转辙机的机械和电气特性和在青藏线安装试验过程进行了较为详细的说明。 相似文献