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论述了在程序设计过程中 ,使用树形控件、SQL 语句、临时表等多种手段 ,达到多个关联数据库的数据由一个可视化树形结构控件显示的方法和技巧 相似文献
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为提升电力物联网中用户数据安全性,提出了电力物联网LDP联邦学习框架。该框架将物联网用户分为常规用户和敏感用户两部分。常规用户通过与电力供应商互通模型与数据,基于横向联邦学习技术学习局部模型并参与更新全局模型;敏感用户利用异构联邦迁移学习技术将全局模型关联到局部模型中,从而保证敏感用户数据安全性。将联邦学习框架应用于GRU、LSTM网络,验证了所提联邦学习框架能够提升网络性能。 相似文献
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多目标跟踪中的数据关联和航迹管理 总被引:1,自引:0,他引:1
传统的多目标关联算法JPDA存在两个缺陷:计算量较大,且其算法框架里缺乏航迹起始和终止逻辑。文中给出了一个航迹管理表,它包含多种情况下航迹的关联,能完成航迹的起始、维持和终结。在可靠航迹关联中,该文提出了一个改进的快速关联算法—多维概率数据关联(MPDA),讨论时主要考虑关联门相交区域中的公共回波对航迹更新的影响。MPDA可以类似与PDA的较低的计算代价达到了接近JPDA的关联成功率。仿真结果表明,文中的数据关联和航迹管理算法对复杂条件下的多目标跟踪能保持较高的跟踪成功率。 相似文献
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本文首先介绍了SqlDataSource和ObjectDataSource的相关层次结构及两个控件的主要用途,然后概述了SqlDataSource的主要功能,最后通过完成了SqlDataSource和ObjectDataSource的数据插入和更新的性能对比试验,通过实验对比两个控件的性能,并对试验结果进行分析,从而为研究人员和企业级的应用人员在项目开发中根据实际需要,选择最高效和最有用的控件时提供参考。 相似文献
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VB的主要应用是编写数据库应用程序 ,数据控件和响应的绑定控件为用户提供了无需编程就可创建简单数据库应用程序的方法。数据控件将被访问的信息与用来显示这些信息的绑定控件 (如文本框、标签、图片框、图象、数据绑定控件等 )连接起来 ,从而完成对已有数据库信息的显示、编辑和更新等操作。下面以创建一个数据入口窗体为例来说明其方法。假设已有名为DB1,DB2的两个数据库 ,各有二个数据表 :TB11,TB12和TB2 1,TB2 2。现欲为DB1的TB11创建一个数据入口窗体。这只需在一个新建窗体上拖放一个数据控件和几个绑定控件 (如果用文本框为绑定控件 ,每一个文本框可显示一个字段。因此 ,在窗体上拖放的文本数量与欲显示的字段数相等。为简便 ,这里的所有控件名均取默认值。再为其设置必要的属性即可实现。对于数据控件 ,有两个属性是必须设置的 ,即 :( 1)DatabaseName属性 ,即设置被访问的数据库文件名 ,本例应选DB1;( 2 )RecordSource属性 ,即指定从哪个表索取信息 ,本例应选TB11。对于各绑定控件 ,也有两个必须设定的属性 :( 1)DataSource属性 ,即告诉绑定控件从哪个数... 相似文献
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数据计算管理系统中,文本控件的字段必须得到追踪以便准确知道是那些数据进行了改变,从而进行数据库的相应更新,本文就字段追踪所出项的标识符问题进行了相关讨论。 相似文献
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基于SIS框架和蚁群算法的非线性多目标跟踪 总被引:1,自引:1,他引:0
该文提出一种新的非线性多目标跟踪方法用蚁群算法实现数据关联和SIS(Sequential Importance Sampling)实现对单目标的跟踪。首先根据数据关联问题对蚁群算法进行修改,考虑目标运动中的约束条件对关联概率的影响,重新定义蚁群算法中的路径和路径长度,从而利用蚁群算法寻找最短路径的能力实现对数据关联。由于SIS框架是针对非线性系统的一种较好的状态估计方法,该文将其作为对单目标进行跟踪的框架,和蚁群算法共同解决非线性情况下的多目标跟踪问题。实验对一维平面和二维平面中的多个目标进行了仿真,结果表明,将蚁群算法应用于解决数据关联问题是行之有效的。 相似文献
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Simultaneous tracking of multiple maneuvering and non-maneuvering targets in the presence of dense clutter and in the absence of any a priori information about target dynamics is a challenging problem. A successful solution to this problem is to assign an observation to track for state update known as data association. In this paper, we have investigated tracking algorithms based on interacting multiple model to track an arbitrary trajectory in the presence of dense clutter. The novelty of the proposed tracking algorithms is the use of genetic algorithm for data association, i.e., observation to track fusion. For data association, we examined two novel approaches: (i) first approach was based on nearest neighbor approach and (ii) second approach used all observations to update target state by calculating the assignment weights for each validated observation and for a given target. Munkres’ optimal data association, most widely used algorithm, is based on nearest neighbor approach. First approach provides an alternative to Munkres’ optimal data association method with much reduced computational complexity while second one overcomes the uncertainty about an observation’s source. Extensive simulation results demonstrate the effectiveness of the proposed approaches for real-time tracking in infrared image sequences. 相似文献
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针对某试飞课题,在NI LabVIEW7.0平台下进行了某试飞科目实时监控软件系统开发。飞行试验中,实验分析了影响该系统试飞参数时间历程图实时刷新的原因,提出了在飞行试验实时监控中,采用优化VI及对Chart控件二次编程的方法解决Chart曲线图实时刷新的问题。在此充分挖掘LabVIEW中Chart控件的属性进行二次编程,解决试飞参数时间历程图实时刷新、显示问题,具有很高的实用价值。 相似文献
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针对港口货船的焦炭称量问题,设计基于Visual Basic6.0的港口运料系统。上位机通过RS 232串口发出控制命令,控制下位机(散料秤)称量货物,再把数据实时返回到上位机,实现上位机和下位机的实时通信和上位机对下位机的控制。为了使得系统在工业控制应用中的功能更加完善,上位机还具备访问数据库、实时更新数据库以及打印报表等功能。 相似文献
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《Mechatronics》2020
The nano scale motions of piezoelectric actuated nano-positioning systems are very sensitive to operating tasks, external disturbances, as well as variations of system dynamics. In this paper, a data-driven Iterative Feedback Tuning (IFT) based Active Disturbance Rejection Control (ADRC) approach is developed to optimize the control performance by conducting controller parameter tuning iteratively from experimental test data. In particular, a parameterized input-output form of the linear ADRC controller is derived for the nano-positioner, where the IFT algorithm is applied to solve the established optimization problem to get the optimal control parameters. The proposed method is verified in simulations where the selection of control criterion and the impact of update step-size are also discussed. Single-axis and dual-axes real-time experiments are finally conducted on an X-Y piezoelectric actuated nano-positioner, which demonstrate significant performance improvement on nano-positioning and tracking over the conventional ADRC method. 相似文献
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An asynchronous distributed cross-layer optimization (ADCO) method was proposed to solve the problem of jointly considering real-time routing,rate allocation and power control in FANET (flying ad hoc network).And a delay-constrained cross-layer optimization framework was designed to formally represent proposed problem.Then Lagrangian relaxation and dual decomposition methods was used to divide joint optimization problem into several sub-problems.ADCO allowed each relay node to perform the optimization operation for different sub-problems with local information,and the relay nodes could update the dual variables based on asynchronous update mechanism.The simulation results show that the proposed algorithm can improve the network performance effectively in terms of energy efficiency,packet timeout ratio and network throughput. 相似文献
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Zaveri M. Merchant S. N. Desai Uday B. 《IEEE transactions on systems, man and cybernetics. Part C, Applications and reviews》2007,37(3):337-351
Data association and model selection are important factors for tracking multiple targets in a dense clutter environment without using a priori information about the target dynamic. We propose a neural-network-based tracking algorithm, incorporating a interacting multiple model and show that it is possible to track both maneuvering and nonmaneuvering targets simultaneously in the presence of dense clutter. Moreover, it can be used for real-time application. The proposed method overcomes the problem of data association by using the method of expectation maximization and Hopfield network to evaluate assignment weights. All validated observations are used to update the target state. In the proposed approach, a probability density function (pdf) of an observed data, given target state and observation association, is treated as a mixture pdf. This allows to combine the likelihood of an observation due to each model, and the association process is defined to incorporate an interacting multiple model, and consequently, it is possible to track any arbitrary trajectory 相似文献