Nuclear Norm Subspace System Identification and Its Application on a Stochastic Model of Plague

The discrete-time model of plague is deduced by zero-order holder based on the continuoustime model. Due to the existence of stochastic disturbances, the stochastic model is given corresponding to the discrete-time model. The state estimation and noise reduction of the stochastic model are achieved by designing Kalman filter. Nuclear norm minimization is to structure the low-rank matrix approximation instead of the singular value decomposition in the process of subspace system identification. According to the plague data from the World Health Organization, the system matrices and noise intensity of the model are identified. Simulations are carried out to show the higher approximation capability of the proposed method.     

浅谈Web数据库

介绍了通过www访问web数据库的优点以及Web数据库的结构、原理和常用的访问技术,并将它与传统的数据库访问方式和构架模式C/S模式进行了优缺点的分析。     

电子电路设计有关问题的探讨

分析了电子电路设计在低频电子电路,高频电子电路,数字电路,印制版制作过程中应注意的实际问题,以提高设计者设计成功的一次性。     

智能楼宇中空调监控系统控制规律的研究

将模糊自适应PID控制和最佳启停控制相结合应用于智能楼宇中的空调监控系统中,经研究发现运用此方法后,系统的超调小了,而且调节迅速、上升时间短,具有良好的鲁棒性和节能效果。     

某大跨度变截面连续箱梁桥时程分析

基于通用有限元程序软件对某桥进行了时程分析,并把理论分析计算结果与实测值进行比较分析,分析结果有助于了解该桥的结构受力性能。     

硬聚氯乙烯(RPVC)板贮槽渗漏的综合防治

现代湿法炼铜常用硬聚氯乙烯(RPVC)板作为防腐结构材料,本文对硬聚氯乙烯板贮槽渗漏问题进行了分析,提出了相应的防治措施。     

Fault tolerant motion planning based on joint torque limit for redundant manipulators

0 IntroductionWith the development of science and technology,manipulators have been widely utilized in some specialfields of space , deeper ocean, and nuclear materialcleanup.Becausethese workingenvironments are distant ,harsh and dangerous ,itis difficultfor peopletorepairthefailed manipulators onthe spot .Therefore ,the manipula-tors should operate normally for a long time . To meetthese requirements ,the manipulators must have not onlyhigher reliability but also fault tolerance capabilities…     

Fabrication of solenoid-type microinductor with different magnetic core schemes by MEMS technique

0 IntroductionThere has been a great demand on micro DC/DCconverter for the applications of the portable electronicproducts such as mobile communication product CDMA(Code Division Multiple Access) ,portable notebookcom-puter ,microprocessor ,digital camcorder andso on.Mag-netic components such as inductors and transformers arethe essential components in constructingthe power supplytransformer ,filter , oscillator , amplifier and micro DC/DCconverter ,andthe miniaturization of inductor an…     

基于改进灰狼算法的粒子滤波算法研究

针对传统粒子滤波算法易出现粒子贫化与权值退化现象和为了实现对非线性系统较为准确的状态估计,通常需要大量粒子的参与的问题,提出了基于改进灰狼算法的新型粒子滤波方法,该算法用粒子表征灰狼个体,模拟狼群捕猎的过程,使粒子向后验概率的高似然区域移动,提高粒子分布的合理性.在灰狼寻优算法中引入了莱维飞行策略,提高灰狼算法的收敛速...     

微挠度桥梁及其试验研究

由于混凝土收缩、徐变和活载的作用,利用常规的方法很难满足机车对桥梁结构变形的要求,作者提出了一种新颖的结构体系———微挠度桥梁来实现这种要求。常规预应力体系用来消除恒载效应,新型的预应力体系用来消除活载效应及结构时变性效应,此种结构具有自适应性。其机理是通过感知元件监控结构的状态,诊断系统判断结构所处的状态,控制系统控制作动系统通过调整体外束的力调整结构的状态。为了验证微挠度桥梁实现的可能性,作者设计微挠度简支梁模型并实现了上述的控制思路。