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采用数学覆盖和物理覆盖两套覆盖系统，使数值流形法能自然地处理裂纹问题。为了将基于移动最小二乘插值(MLS)的数值流形法(MLS-NMM)应用到动态裂纹扩展中，通过引入Bathe隐式时间积分方法来提高时间离散的计算精度，并采用一种新的自由度继承策略解决动态裂纹扩展过程中能量不一致问题，结合动态裂纹扩展的断裂力学准则，编制基于MLS-NMM的模拟动态裂纹扩展程序。通过典型算例的计算分析表明，该方法能有...
AUTOMATIC RAIL EXTRACTION AND CELARANCE CHECK WITH A POINT CLOUD CAPTURED BY MLS IN A RAILWAY
MLS Railway Rail Extraction Clearance Check
2018/6/4
Recently, MLS (Mobile Laser Scanning) has been successfully used in a road maintenance. In this paper, we present the application of MLS for the inspection of clearance along railway tracks of West Ja...
APPLICATION OF MLS DATA TO THE ASSESSMENT OF SAFETY-RELATED FEATURES IN THE SURROUNDING AREA OF AUTOMATICALLY DETECTED PEDESTRIAN CROSSINGS
Mobile Mapping System 3D Point Cloud Processing Road Marking Classification Accessibility Analysis
2018/6/5
During the last few years, there has been a huge methodological development regarding the automatic processing of 3D point cloud data acquired by both terrestrial and aerial mobile mapping systems, mo...
摩擦接触问题的求解是将基于移动最小二乘插值的数值流形法（MLS-NMM）应用到裂纹扩展的必经之路。该文通过结合罚-线性互补方式的施加接触边界条件，并使用拉格朗日乘子法施加本质边界条件，得出一套基于MLS_NMM的摩擦接触问题的求解体系。该方法无需节点与边界重合，则可域外布点和均匀布点，来提高插值精度和降低布点难度，尤其是接触边界处。采用罚-线性互补的方式施加接触条件，使计算格式统一而简洁，利于编程...
LOW-LEVEL TIE FEATURE EXTRACTION OF MOBILE MAPPING DATA (MLS/IMAGES) AND AERIAL IMAGERY
Mobile Mapping Feature Extraction Feature Matching Image Orientation
2016/3/25
Mobile Mapping (MM) is a technique to obtain geo-information using sensors mounted on a mobile platform or vehicle. The mobile platform’s position is provided by the integration of Global Navigation S...
SIMPLE APPROACHES TO IMPROVE THE AUTOMATIC INVENTORY OF ZEBRA CROSSING FROM MLS DATA
Point clouds LiDAR Automatic Processing Traffic signs Road Inventory 3D Modelling
2015/9/21
The city management is increasingly supported by information technologies, leading to paradigms such as smart cities, where decision-makers, companies and citizens are continuously interconnected. 3D ...
为了准确分析多径环境条件下微波着陆系统接收机测角误差，在深入分析微波着陆系统(MLS)测角原理的基础上，提出了一种基于扫描波束主瓣等效替代的误差分析方法。该方法通过把往返波束脉冲主瓣用高斯钟形替代，准确计算了接收的扫描脉冲-3 dB门限前后沿误差，建立了多路径条件下统一实用的接收脉冲包络波峰位置偏移误差模型和锁住闸门测量误差模型。为验证模型准确性，以特定的多径环境条件为例，计算MLS接收机的测角误...
基于MLS策略的机密性和完整性动态统一模型
Biba 安全模型 敏感标记
2009/7/21
BLP模型是最经典的机密性模型，Biba模型则是最经典的完整性模型。绝大多数主客体机密性和完整性具有一致性，BLP模型和Biba模型就产生矛盾。提出了机密性和完整性的动态统一模型，给出了一系列安全规则，引入访问历史标记，动态调整主体的安全标记，将BLP和Biba真正结合起来，实现了机密性和完整性的统一，使系统具有较好的可用性。并给出了实例对模型进行了说明。