排序方式: 共有13条查询结果,搜索用时 687 毫秒
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针对北京市中心城区重点功能区范围内轨道交通线网密度、站点覆盖率不足等问题,以北京CBD重点功能区为研究对象,应用空间句法理论及空间分割方法,建立CBD地区道路网空间句法模型,量化分析该区域内可达性与交通流量的关系,结合既有轨道交通网络,对CBD地区轨道交通线网规划设计、路由选择提出指导性建议.结果表明,将可达性评价指标与交通流量相结合,能够定量描述城市轨道交通网络可达性及结构绩效,并选择可达性较高轨道交通线路路由.该方法适用于城市轨道交通线网规划以及不同规划方案的比选和评价,可以作为方案评价方法之一,同时应该结合其他线网规划要素,在城市轨道交通线网规划中作为重要考虑因素综合研究. 相似文献
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为描述取小、多重推理、多维推理等实际推理方法,在格值命题逻辑系统Lvpl中,引入了几类相应的推理规则.这些推理规则由语法和语义两部分组成,且在两部分之间存在一定的协调水平.证明了对于适当的语法语义协调水平,当Lvpl的公式集的L型模糊集为同态映射时,它们关于这几类推理规则都在一定程度上封闭. 相似文献
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交通气象智能信息服务系统是实现在互联网上更加方便、快捷、自动的搜索到用户所需要的信息的应用平台,该系统不同于现有的限制性搜索模式,首先结合分词系统,采用句型分析算法,并结合系统本身建立的信息检索规则库对用户的输入进行智能分析,然后通过平台内部建立的信息查询索引结构对相关信息进行综合,最终使用户得到更准确的信息。 相似文献
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刘剑剑 《广州航海高等专科学校学报》2009,17(1):45-47
分析了航海英语句法特点,指出句法分析在航海英语阅读教学中的重要性以及句法分析教学的必要性,并对句法分析教学的实施提出了可行性的建议. 相似文献
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本文以居民OD出行调查中形成的交通中区为分析对象,通过借鉴空间句法理论的思想,以GIS软件Arcview3.3中的空间句法分析模块为工具,分别对2003年和2007年扬州市道路网络与居民出行分布的关系进行了实证研究.在对句法理论与道路网关系的解析基础上,绘制了扬州市的轴线地图并运用Arcview软件得到空间句法分析变量,随后利用SPSS软件对各中区轴线句法指标的平均值与交通中区发生吸引量进行了相关性分析,结果表明二者具有较高相关性,这对于城市道路网络布局规划及评价、既定路网条件下各中区居民出行量预测均有重要意义. 相似文献
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Samia Sharmin 《运输评论》2018,38(4):524-550
ABSTRACTAmple research has been conducted investigating the built environment impacts on pedestrian movement (PM). A clear division is also evident in the literature on this topic: one group tends to use geographic measures (metric distance) of the environment to explain pedestrian behaviour; the other group uses syntactic measures (visual distance). Many review articles have been published on the former. However, relatively little is known about the effect size (ES), directions, and consistency of syntactic measures in explaining PM. This paper fills this gap through a meta-analysis of published and unpublished studies on this topic spanning over 1975–2016, and answers the following five research questions: (a) What are the different measures used in the space syntax literature to explain PM?; (b) What are the magnitudes and directions of associations between space syntax measures and PM?; (c) Which space syntax measure has a more consistent relationship with PM?; (d) To what extent do the explanatory powers of different measures vary between their derivation methods?; and (e) What are the likely causes of variations of the reported results in prior studies? This research examined four syntactic measures (integration, connectivity, choice, and control) in a random effect model with 95% confidence interval (CI). The choice and integration measures were further investigated based on their operational approaches (topological, angular and metric). Results show that integration (ES?=?0.206, 95% CI?=?0.173–0.238, p?<?0.001), choice (ES?=?0.481, 95% CI?=?0.391–0.561, p?<?0.001), and connectivity (ES?=?0.305, 95% CI?=??0.225–0.696, p?=?0.257) measures positively influence PM with choice being the strongest predictor. Both connectivity and control (ES?=??0.001, 95% CI?=??0.117–0.115, p?=?0.990) were found to have a statistically insignificant impact. The choice and integration measures show stronger effects when derived using the angular approach (ES?=?0.493 for choice, and ES?=?0.502 for integration) compared to topological approach (ES?=?0.374 for choice, and ES?=?0.124 for integration). However, the reported results of all measures are highly heterogeneous, perhaps due to the differences in research design. The significance, magnitude, and consistency of integration and choice measures justify their relevance in built environment interventions to promote PM. 相似文献
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为了提高航班计划正确性和完整性的自动检查和分析能力,在分析航班计划编排特点的基础上,给出了基于有限自动机的航班计划句法检查技术,进行航班计划句法检查中的词法分析、语法分析和规则检查,并进行了例证分析,验证了运用不确定有限自动机进行航班计划句法检查的可行性。 相似文献
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浅析民航专业英语的语言特点 总被引:2,自引:0,他引:2
孙文娟 《武汉船舶职业技术学院学报》2010,9(1):94-97
本文从词汇、句法及文体三个角度对民航英语专业书籍中的语言特点进行探讨,以期更加深刻地理解和掌握这一专门用途英语。 相似文献