基于LabVIEW的空调水系统优化控制策略研究

在对空调水系统中的压差控制与温差控制两种控制策略进行分析后,为提高系统节能效果,将串级控制方法引入到空调水系统控制中;以西安建筑科技大学变风量空调实验室内的冷冻水系统为对象,提出用最小二乘法辨识串级回路主、副环的传递函数模型,并在此基础上,基于LabVIEW软件对控制系统进行仿真分析和实验研究;仿真和实验结果证明了串级控制策略在空调水系统控制中的有效性和良好的应用价值。     

Adaptive neural control for uncertain stochastic nonlinear strict-feedback systems with time-varying delays: A Razumikhin functional method

This paper addresses the problem of adaptive neural control for a class of uncertain stochastic nonlinear strict-feedback systems with time-varying delays. A novel adaptive neural control scheme is presented for this class of systems, based on a combination of the Razumikhin functional approach, the backstepping technique and the neural network (NN) parameterization. The proposed adaptive controller guarantee that all the error variables are 4-Moment semi-globally uniformly ultimately bounded in a compact set while the system output converges to a small neighborhood of the reference signal. Two simulation examples are given to demonstrate the effectiveness of the proposed control schemes.     

A spline wavelet finite element formulation of thin plate bending

The wavelet scaling functions of spline wavelets are used to construct the displacement interpolation functions of triangular and rectangular thin plate elements. The displacement shape functions are then expressed by spline wavelet functions. A spline wavelet finite element formulation of thin plate bending is developed by using the virtual work principle. Two numerical examples have shown that the bending deflections and moments of thin plates agree well with those obtained by the differential equations and conventional elements. It is demonstrated that the current spline wavelet finite element method (FEM) can achieve a high numerical accuracy and converges fast. The proposed spline wavelet finite element formulation has a wide range of applicability since it is developed in the same way like conventional displacement-based FEM.     

Online classifier adaptation for cost-sensitive learning

In this paper, we propose the problem of online cost-sensitive classifier adaptation and the first algorithm to solve it. We assume that we have a base classifier for a cost-sensitive classification problem, but it is trained with respect to a cost setting different to the desired one. Moreover, we also have some training data samples streaming to the algorithm one by one. The problem is to adapt the given base classifier to the desired cost setting using the steaming training samples online. To solve this problem, we propose to learn a new classifier by adding an adaptation function to the base classifier, and update the adaptation function parameter according to the streaming data samples. Given an input data sample and the cost of misclassifying it, we update the adaptation function parameter by minimizing cost-weighted hinge loss and respecting previous learned parameter simultaneously. The proposed algorithm is compared to both online and off-line cost-sensitive algorithms on two cost-sensitive classification problems, and the experiments show that it not only outperforms them on classification performances, but also requires significantly less running time.

     

基于扩展时间对象Petri网的粗糙网络攻击模型

为了解决复杂网络中相似攻击手段和相似节点对象在攻击模型中造成冗余的问题,提出一种基于脆弱关联模型的粗糙网络攻击建模方法。在攻击变迁域和节点对象域上定义属性集,将相似的攻击方式和网络节点分类,形成论域Petri网上的类空间。通过定义路径相似度,利用蚁群算法找出所有可达攻击目标的特征路径,并在这些特征路径中找出给目标节点带来最大威胁的攻击路径。实验证明,该方法能够快速地定位实时监控信息中涉及的节点对象和攻击方式,在各种特征攻击路径中准确找到其所在位置。     

PowerBuilder与MapInfo结合进行地理信息系统（GIS）二次开发

主要探讨了在基于Maplnfod的二次开发应用系统中,采用OLE自动化以及与客户／服务器开发工具PowerBuilder系统集成开发的基本方法和集成开发中的一些关键技术的实现方法,     

视频监控技术在水利信息化中的应用

水利信息化是实现水利现代化的重要手段,视频监控技术在水利信息化建设中发挥着重要的作用。本文首先研究了视频监控中的视频数据采集、编码、传输,以及分析技术,然后阐述了视频监控在水利中的应用。     

Enhanced P, N and C removal from domestic wastewater using constructed wetland employing construction solid waste (CSW) as main substrate

Construction solid waste (CSW), an inescapable by-product of the construction and demolition process, was used as main substrate in a four-stage vertical subsurface flow constructed wetland system to improve phosphorus P removal from domestic wastewater. A 'tidal flow' operation was also employed in the treatment system. Under a hydraulic loading rate (HLR) of 0.76 m3/m2 d for 1st and 3rd stage and HLR of 0.04 m3/m2 d for 2nd and 4th stage of the constructed wetland system respectively and tidal flow operation strategy, average removal efficiencies of 99.4% for P, 95.4% for ammoniacal-nitrogen, 56.5% for total nitrogen and 84.5% for total chemical oxygen demand were achieved during the operation period. The CSW-based constructed wetland system presents excellent P removal performance. The adoption of tidal flow strategy creates the aerobic/anoxic condition intermittently in the treatment system. This can achieve better oxygen transfer and hence lead to more complete nitrification and organic matter removal and enhanced denitrification. Overall, the CSW-based tidal flow constructed wetland system holds great promise for enabling high rate removal of P, ammoniacal-nitrogen and organic matter from domestic wastewater, and transforms CSW from a waste into a useful material.     

公共项目公私合作(PPP)控制权配置的决策模型

针对公私合作(PPP)项目,以VFM效果作为政府收益的评价指标,分析控制权为连续变量的情况下投资、成本和收益等变量的取值,在此基础上构建控制权配置与VFM效果的相关关系模型,结果发现,VFM效果与项目公司拥有的控制权呈二次曲线关系,因此,二次项系数、一次项系数及对称轴位置影响VFM的单调性,进而决定着控制权的最佳配置.论文基于上述原理构建控制权配置的决策模型,并通过算例验证所得模型具有较强的适用性.