应用线性矩阵不等式解决时滞系统控制问题

介绍了应用线性矩阵不等式（LMI）解决一类时滞系统H∞控制问题,给出了基于Lyapunov第二法的H∞稳定条件,通过求解锥补线性化问题,得到相应的控制器,使得闭环系统稳定且满足H∞性能指标.并通过实例给出了仿真结果.     

扩展双星树的 Wiener-E 指标和 Wiener-O 指标

扩展双星树（T（n）n1,n2）是 n－1长路径的两端点分别联结 n1条悬挂边和 n2条悬挂边所得到的图。论文根据扩展双星树的结构特征,研究了扩展双星树的类Wiener指数,给出了一般计算公式。     

计算机软件在办公自动化管理上的应用

随着科学技术的日新月异,自动化办公在社会工作中的应用领域十分宽广。自动化办公是一种综合性较强的办公模式,受到全社会工作人员的瞩目。自动化办公的快速发展与计算机软件的应用是密不可分的,它是计算机软件广泛应用的具体表现方式。计算机软件有效的推动了企事业单位自动化办公的发展,本文着重分析计算机软件在自动化管理中产生的积极作用。     

汉语框架网中未登录词元的框架选择

汉语框架网的低覆盖率导致汉语句子中存在许多未登录的词元,严重制约着汉语的框架语义分析任务。针对未登录词元的框架识别问题,该文借助同义词词林的词义信息,提出基于平均语义相似度计算及最大熵模型两种方法,采用静态特征与动态特征相结合的特征选择方法。实验证明,这两种方法都能有效地实现未登录词元的框架选择,基于相似度计算的方法(TOP-4)获得78.61%的准确率;基于最大熵的方法结果可达87.29%,同时在新闻语料上达到了75%的准确率。     

MTOL网络接入流程及接入失败分析

本文主要分析MTOL的接入流程,是从移动台发起呼叫请求到通话建立的过程,在这个过程中会有多种多样的原因导致接入失败,本文重点分析移动台是如何接入网络的,以及在无线侧导致接入失败的原因,并以2009年2月DT测试为样本,选取典型事件,对接入异常事件做一个简单TOPN分析并提出解决建议。     

一体化办公系统分布式部署

信息化的发展,移动互联的猛进,进一步催生了云计算的健康发展,在互联网环境下办公是IT发展的趋势,如何满足现代化办公的需要,如何建立高效、方便的运维方式,是我们认真考虑的问题。基于互联网,在系统架构时必须考虑可靠性、安全性,还要考虑系统能动态的方便扩充和访问流畅行,这便要求产品要有良好的系统架构,支持动态扩展和高效并发。本文以永中云办公为例,介绍了一体化办公系统分布式部署解决方案。     

心理资本前因变量研究

采用心理资本问卷对分别属于医药、建筑、水利工程、电信、通讯运营和服务行业的6家企业的员工进行了调查.根据对回收的283份有效问卷的统计分析,认为员工的性别、受教育程度和所在企业的性质对员工心理资本不会产生显著性影响,而员工年龄的影响显著,50岁以上员工的总体心理资本水平高于其他年龄段员工.     

基于约束满足的多目标双足机器人动态步态参数优化*

目前的步态优化算法仅仅实现了对单一目标的优化,把双足机器人步态优化看做是多目标优化问题,构建了衡量稳定性、能量消耗、步行速度三个目标评价函数。考虑到直接对多个目标加权求和的方法不能很好地处理多目标问题,提出一种新的基于约束满足的多目标步态参数优化算法,其思想是把基于惩罚函数的SPEA2(strength Pareto evolutionary algorithm2 )应用到多目标双足机器人动态步态参数优化问题上,规划出了同时满足这三个目标的动态优化步态。通过仿真实验表明了算法的有效性。     

Fabrication and characterization of nano silver powder prepared by spray pyrolysis

Silver powder was fabricated by spray pyrolysis, using 2%–20% AgNO₃ solution, 336–500 mL/h flux of AgNO₃ solution, 0.28–0.32 MPa flux of carrier gas and in the 620–820 °C temperature range. The effects of furnace set temperature, concentration of AgNO₃ aqueous solution, flux of AgNO₃ aqueous solution as well as carrier gas on the morphology and particle size distribution of silver powder, were investigated. The experimental results showed that with the high concentration of AgNO₃ aqueous solution, the average grain size of silver decreased with the increasing of furnace set temperature. But the gain size distribution was not homogenous, the discontinuous grain growth occurred. With the low concentration of AgNO₃ aqueous solution, the higher furnace set temperature made the nano sliver grains sintered together to grow. Nano silver powder about 100 nm was fabricated by spray pyrolysis, using 2wt% AgNO₃ solutions, 336 mL/h flux of AgNO₃ aqueous solution, 0.32 MPa flux of carrier gas at 720 °C furnace set temperature.     

Zonal disintegration phenomenon in enclosing rock mass surrounding deep tunnels -- Elasto-plastic analysis of stress field of enclosing rock mass

The zonal disintegration phenomenon (ZDP) is a typical phenomenon in deep block rock masses. In order to investigate the mechanism of ZDP, an improved non-linear Hock-Brown strength criterion and a bi-linear constitutive model of rock mass were used to analyze the elasto-plastic stress field of the enclosing rock mass around a deep round tunnel. The radius of the plastic region and stress of the enclosing rock mass were obtained by introducing dimensionless parameters of radial distance. The results show that tunneling in deep rock mass causes a maximum stress zone to appear in the vicinity of the boundary of the elastic and the plas-tic zone in the surrounding rock mass. Under the compression of a large tangential force and a small radial force, the rock mass in the maximum stress zone was in an approximate uniaxial loading state, which could lead to a split failure in the rock mass.