Fast Nearest-Neighbor Query Processing in Moving-Object Databases

A desirable feature in spatio-temporal databases is the ability to answer future queries, based on the current data characteristics (reference position and velocity vector). Given a moving query and a set of moving objects, a future query asks for the set of objects that satisfy the query in a given time interval. The difficulty in such a case is that both the query and the data objects change positions continuously, and therefore we can not rely on a given fixed reference position to determine the answer. Existing techniques are either based on sampling, or on repetitive application of time-parameterized queries in order to provide the answer. In this paper we develop an efficient method in order to process nearest-neighbor queries in moving-object databases. The basic advantage of the proposed approach is that only one query is issued per time interval. The time-parameterized R-tree structure is used to index the moving objects. An extensive performance evaluation, based on CPU and I/O time, shows that significant improvements are achieved compared to existing techniques.     

多目标满意优化在模糊控制器设计中的应用

提出了一种应用多目标满意优化模型进行模糊控制器优化设计的方法。给出了计算模型和算法。该方法以满意度函数反映设计者对性能指标的评价，更符合实际要求。应用该方法对模糊控制器的隶属函数参数以及控制规则库进行优化设计。仿真结果表明了该方法的有效性和实用性。     

振动筛振动方向角的调整

建立振动筛力学模型和运动微分方程，推导出振动方向角的表达式，通过分析影响振动方向角的因素，提出振动方向角的调整方法。     

SF_6 旋弧灭弧室结构与驱弧磁场大小关系

ＳＦ６旋弧灭弧室利用电弧在磁场中快速旋转而熄弧，了解磁场的大小分布情况十分重要，因此采用向量磁位法对复杂结构下灭弧室磁场分布进行计算，同时也分析了铁磁物的存在对磁场分布的影响．     

道路网拓扑模型的数据结构和生成方法

针对路径规划所需数据的特点，采用“混合数据结构”组织地图道路网数据，通过路段提取、节点分离、目标点区域确定，快速生成了起始点至目标点的路径规划道路网拓扑模型。     

Reconstructing 3D trajectories of independently moving objects using generic constraints

The 3D reconstruction of scenes containing independently moving objects from uncalibrated monocular sequences still poses serious challenges. Even if the background and the moving objects are rigid, each reconstruction is only known up to a certain scale, which results in a one-parameter family of possible, relative trajectories per moving object with respect to the background. In order to determine a realistic solution from this family of possible trajectories, this paper proposes to exploit the increased linear coupling between camera and object translations that tends to appear at false scales. An independence criterion is formulated in the sense of true object and camera motions being minimally correlated. The increased coupling at false scales can also lead to the destruction of special properties such as planarity, periodicity, etc. of the true object motion. This provides us with a second, ‘non-accidentalness’ criterion for the selection of the correct motion among the one-parameter family.     

基于约束图的三维实体建模研究

提出了一种新的三维建模方法:基于约束图的三维实体建模方法。该方法首先通过获取到的二维图形几何信息,对构成二维图形的图元进行识别和分类,然后建立起回转体之间的约束关系—几何约束图,实现了对二维图形进行自动识别。最后,利用三维约束形体布尔函数,在AutoCAD的VBA环境中实现三维建模。     

基于改进运动历史图像的多运动目标实时跟踪

提出了一种利用视频图像对运动目标进行实时检测与跟踪的新方法.该方法利用基于改进的时间片的运动历史图像(tMHI)的灰度阶梯轮廓方法对多个运动目标进行检测,通过卡尔曼滤波器对多目标进行跟踪,并得到了各个运动目标的轨迹曲线,进而实现了对视频图像中多目标的跟踪.同时,该方法对多个目标的遮挡问题获得了明显的改善效果.实验结果表明,该方法能够对复杂场景下的多个目标进行有效的识别和准确的跟踪,系统的实时性强,识别率高,而且该方法对于复杂视频监视系统场景中的光照变化、雨雾等干扰具有较强的稳健性.     

JDO技术研究

Java有几种存取数据库的方法：对象序列化、JDBC、面向对象映射工具、对象数据库、实体EJB，但每一种存储方案都存在一定的限制，为了解决这些限制，简单、透明、自动地实现O／R(对象／关系)的映射，SUN提出了JDO规范——数据存取的一种新技术。文中介绍JDO技术的体系结构及其关键技术，比较分析JDO技术与JDBC、EJB技术的差异，论述JDO规范采用透明的中间件存储技术减少数据库应用，尤其是WEB方式数据库应用开发的复杂性及提高开发和维护的效率，举例说明采用JDO技术开发基于WEB方式的数据库应用的基本编程步骤，并分析了目前JDO规范1．0的缺陷。     

基于颜色分割和LBP纹理检测的运动目标提取

针对传统LBP纹理检测在运动目标提取中对原地或缓慢运动物体容易误判为背景的问题,提出一种基于颜色分割和LBP纹理检测的提取方法。主要思想分为3步：根据LBP纹理检测结果映射得到宏块级粗糙运动目标;根据K‐means颜色分割方法得到颜色分类信息;根据提出的宏块交叠机制,将颜色信息与运动信息进行融合,得到最终的提取结果。对比实验结果表明,该方法在保持良好的光照鲁棒性和阴影抵抗力的同时,可以有效改善运动目标空洞、背景融入等问题,满足实时要求。