Robustness of discrete-time state feedback control systems

This paper presents stability robustness results for linear multivariable discrete-time systems with uncertainties. Robust stability of the full-state feedback linear quadratic regulator in the presence of perturbations of the system parameters is investigated. These results are based on recently developed bounds on structured perturbations of a stable linear discrete-time system. The paper applies these results to a paper-machine head box system example.     

Sensor fusion by pseudo information measure: a mobile robot application

In any autonomous mobile robot, one of the most important issues to be designed and implemented is environment perception. In this paper, a new approach is formulated in order to perform sensory data integration for generation of an occupancy grid map of the environment. This method is an extended version of the Bayesian fusion method for independent sources of information. The performance of the proposed method of fusion and its sensitivity are discussed. Map building simulation for a cylindrical robot with eight ultrasonic sensors and mapping implementation for a Khepera robot have been separately tried in simulation and experimental works. A new neural structure is introduced for conversion of proximity data that are given by Khepera IR sensors to occupancy probabilities. Path planning experiments have also been applied to the resulting maps. For each map, two factors are considered and calculated: the fitness and the augmented occupancy of the map with respect to the ideal map. The length and the least distance to obstacles were the other two factors that were calculated for the routes that are resulted by path planning experiments. Experimental and simulation results show that by using the new fusion formulas, more informative maps of the environment are obtained. By these maps more appropriate routes could be achieved. Actually, there is a tradeoff between the length of the resulting routes and their safety and by choosing the proper fusion function, this tradeoff is suitably tuned for different map building applications.     

基于Web的在线考试系统的研究

介绍了在线考试系统理论（主要是项目反映理论和组卷理论），在线考试系统的模块，画出了系统运行流程图，使读者对系统有所基本理解，并在远程教学中运用。     

面向功能的形位公差类型的自动生成

在分析和讨论功能表面及其联系与形位公差之间的关系的基础上，探讨了基于图论的几何约束的表示方法，给出了面向功能的计算机辅助形位公差类型的确定和自动生成方案。一个简单的实例说明分析了此方案的推理过程。     

事件模糊概率的确定方法

模糊故障树底事件的模糊性是一个客观存在 ,必须加以解决。本文从理论上用三种不同表示方法处理这个问题 ,具有理论意义和工程应用价值。     

一种基于油液光谱分析和免疫原理的内燃机磨损故障诊断方法

人工免疫系统(AIS)具有分布性、自适应性和动平衡性等特点,通过在油液分析领域引入免疫原理,将油液光谱分析的正常数据和故障数据分别作为AIS的自己串和非己串,进化学习后生成典型故障条件下的成熟检测器,并依据该检测器对某型军用内燃机油液分析数据进行了故障诊断.应用结果表明:新的内燃机故障诊断方法能够有效分辨出故障数据,取得了很好的故障诊断效果.     

Theoretical study of an energetic material di-lH-1,3,4-triazole derivatives

Computations by density functional theory （DFT） method are performed on a series of di-lH-1,3,4-triazole derivatives with different sub- stituents and linkages. The heat of formation （HOF） is predicted by the designed isodesmic reactions. The predicted results reveal that -N3 and -N=N- groups are effective structural units for increasing the HOF values of the di-lH-1,3,4-triazole derivatives. The HOMO-LUMO gap is affected by the substituents and linkage groups. Detonation performance is evaluated using the Kamlet-Jacobs approach based on the calculated density and HOE The results indicate that -NO2, -NF2, -NH-, -NH-NH- and -N=N- groups are helpful for enhancing the detonation properties of di-lH-1,3,4-triazole derivatives. The bond dissociation energy and bond order of the weakest bonds are analyzed to investigate their stability. It is observed that the -CH2-, -CH2-CH2- and -CH=CH- groups are effective structural units for improving the stabilities of these derivatives. Considering the detonation performance and the stability, five compounds are screened as the potential candidates for high energy density materials.     

基于证据理论的电子装备故障诊断

基于证据理论的电子装备故障诊断,采用信任函数作为不确定性度量工具.首先建立基本概率赋值,然后计算信任函数,最后按照一定的组合规则作出决策.其运用信度函数表达概率大小,通过多诊断设备测试被诊断对象,得出属于各类故障的信度函数.再利用组合规则进行信息融合,得到融合后症状分别属于各类故障的信度函数.最后确定故障类型.     

自动控制原理设计性实验教学探讨

该文对自动控制原理实验中设计性实验的教学方法进行了探讨,从设计性实验项目的制定、教学方法以及考核制度等方面,结合作者的教学实践介绍了一些教学经验,并对目前设计性实验存在的一些问题进行了分析,提出了建议。     

Settlement of Internal Cutthroat Competition Amid IT Group Companies: Away from "Prisoners'' Dilemma" of Price Wars

Cutthroat competition amid subsidiary companies of IT Group Company due to immanent characteristics of IT industry and grouping management mechanism infringes upon the collective profits. Two ways to avoid cutthroat competition of group company with game theory are studied: the assessment objective made by IT group company for subsidiary companies focuses on profits not revenue;the supervisory department of group company shall intensify law enforcement strength and give severe punishment against illegal depreciation of the subsidiary company.