Due to limitations in geometric representation and semantic description, the current pedestrian route analysis models are inadequate. To express the geometry of geographic entities in a micro-spatial environment accur...Due to limitations in geometric representation and semantic description, the current pedestrian route analysis models are inadequate. To express the geometry of geographic entities in a micro-spatial environment accurately, the concept of a grid is presented, and grid-based methods for modeling geospatial objects are described. The semantic constitution of a building environment and the methods for modeling rooms, corridors, and staircases with grid objects are described. Based on the topology relationship between grid objects, a grid-based graph for a building environment is presented, and the corresponding route algorithm for pedestrians is proposed. The main advantages of the graph model proposed in this paper are as follows： 1） consideration of both semantic and geometric information, 2） consideration of the need for accurate geometric representation of the micro-spatial environment and the efficiency of pedestrian route analysis, 3） applicability of the graph model to route analysis in both static and dynamic environments, and 4） ability of the multi-hierarchical route analysis to integrate the multiple levels of pedestrian decision characteristics, from the high to the low, to determine the optimal path.展开更多
With increasingly complex website structure and continuously advancing web technologies,accurate user clicks recognition from massive HTTP data,which is critical for web usage mining,becomes more difficult.In this pap...With increasingly complex website structure and continuously advancing web technologies,accurate user clicks recognition from massive HTTP data,which is critical for web usage mining,becomes more difficult.In this paper,we propose a dependency graph model to describe the relationships between web requests.Based on this model,we design and implement a heuristic parallel algorithm to distinguish user clicks with the assistance of cloud computing technology.We evaluate the proposed algorithm with real massive data.The size of the dataset collected from a mobile core network is 228.7GB.It covers more than three million users.The experiment results demonstrate that the proposed algorithm can achieve higher accuracy than previous methods.展开更多
[目的]为打通变电工程全生命周期各阶段之间的数据隔阂,实现几何模型和工程信息的流转,提出了基于图结构的变电工程数据模型构建方法。[方法]首先分析模型几何信息和工程数据信息在变电工程各阶段的流转,将数据模型分为核心模型与场景模...[目的]为打通变电工程全生命周期各阶段之间的数据隔阂,实现几何模型和工程信息的流转,提出了基于图结构的变电工程数据模型构建方法。[方法]首先分析模型几何信息和工程数据信息在变电工程各阶段的流转,将数据模型分为核心模型与场景模型,其次按照变电工程的土建部分和电气设备来组织图的拓扑结构,然后将具有树形结构的IFC模型之中的部件之间的关系转换为“边”的形式,模型部件转为“节点”的形式,构建图结构并导入图数据库,最后设计电气设备部件级别的变电工程数据模型结构,并将该模型与核心模型的部件建立关联关系,形成变电工程图结构数据模型。[结果]测试结果表明变电工程图结构数据模型导入图数据库后可以实现几何模型与工程信息模型的灵活组合和分解,并可在面对大量几何结构和属性信息的复杂关联关系时实现高效的模型组件信息的修改和查询。[结论]基于图结构的数据模型可以同时承载几何信息和工程信息场景模型。它实现了各阶段对于模型颗粒度调整和工程信息增补和移除的需求,相比于基于表单管理的COBie(Construction Operations Building information exchange)标准可以为用户提供更容易理解的数据流转路径。展开更多
基金supported by National Natural Science Foundation of China(Nos.41571387,41201375 and 41501440)Tianjin Research Program of Application Foundation and Advanced Technology(No.14JCQNJC07900)+1 种基金Tianjin Science and Technology Planning Project(Nos.15ZCZDSF00390 and 14TXGCCX00015)Opening Fund of Tianjin Engineering Research Center of Geospatial Information Technology"Modeling and analysis of path graph in 3D indoor spatial environment"
文摘Due to limitations in geometric representation and semantic description, the current pedestrian route analysis models are inadequate. To express the geometry of geographic entities in a micro-spatial environment accurately, the concept of a grid is presented, and grid-based methods for modeling geospatial objects are described. The semantic constitution of a building environment and the methods for modeling rooms, corridors, and staircases with grid objects are described. Based on the topology relationship between grid objects, a grid-based graph for a building environment is presented, and the corresponding route algorithm for pedestrians is proposed. The main advantages of the graph model proposed in this paper are as follows： 1） consideration of both semantic and geometric information, 2） consideration of the need for accurate geometric representation of the micro-spatial environment and the efficiency of pedestrian route analysis, 3） applicability of the graph model to route analysis in both static and dynamic environments, and 4） ability of the multi-hierarchical route analysis to integrate the multiple levels of pedestrian decision characteristics, from the high to the low, to determine the optimal path.
基金supported in part by the Fundamental Research Funds for the Central Universities under Grant No.2013RC0114111 Project of China under Grant No.B08004
文摘With increasingly complex website structure and continuously advancing web technologies,accurate user clicks recognition from massive HTTP data,which is critical for web usage mining,becomes more difficult.In this paper,we propose a dependency graph model to describe the relationships between web requests.Based on this model,we design and implement a heuristic parallel algorithm to distinguish user clicks with the assistance of cloud computing technology.We evaluate the proposed algorithm with real massive data.The size of the dataset collected from a mobile core network is 228.7GB.It covers more than three million users.The experiment results demonstrate that the proposed algorithm can achieve higher accuracy than previous methods.
文摘识别非驾驶行为是提高驾驶安全性的重要手段之一。目前基于骨架序列和图像的融合识别方法具有计算量大和特征融合困难的问题。针对上述问题,本文提出一种基于多尺度骨架图和局部视觉上下文融合的驾驶员行为识别模型(skeleton-image based behavior recognition network,SIBBR-Net)。SIBBR-Net通过基于多尺度图的图卷积网络和基于局部视觉及注意力机制的卷积神经网络,充分提取运动和外观特征,较好地平衡了模型表征能力和计算量间的关系。基于手部运动的特征双向引导学习策略、自适应特征融合模块和静态特征空间上的辅助损失,使运动和外观特征间互相引导更新并实现自适应融合。最终在Drive&Act数据集进行算法测试,SIBBR-Net在动态标签和静态标签条件下的平均正确率分别为61.78%和80.42%,每秒浮点运算次数为25.92G,较最优方法降低了76.96%。
文摘[目的]为打通变电工程全生命周期各阶段之间的数据隔阂,实现几何模型和工程信息的流转,提出了基于图结构的变电工程数据模型构建方法。[方法]首先分析模型几何信息和工程数据信息在变电工程各阶段的流转,将数据模型分为核心模型与场景模型,其次按照变电工程的土建部分和电气设备来组织图的拓扑结构,然后将具有树形结构的IFC模型之中的部件之间的关系转换为“边”的形式,模型部件转为“节点”的形式,构建图结构并导入图数据库,最后设计电气设备部件级别的变电工程数据模型结构,并将该模型与核心模型的部件建立关联关系,形成变电工程图结构数据模型。[结果]测试结果表明变电工程图结构数据模型导入图数据库后可以实现几何模型与工程信息模型的灵活组合和分解,并可在面对大量几何结构和属性信息的复杂关联关系时实现高效的模型组件信息的修改和查询。[结论]基于图结构的数据模型可以同时承载几何信息和工程信息场景模型。它实现了各阶段对于模型颗粒度调整和工程信息增补和移除的需求,相比于基于表单管理的COBie(Construction Operations Building information exchange)标准可以为用户提供更容易理解的数据流转路径。
