基于.Net的数字化校园单点登录系统研究   总被引：1，自引：0，他引：1  

夏冰  梁晓丽  石峰 《科技广场》2010,(6):31-35

本文介绍了校园网中各信息平台的现状,从数字化校园单点登录系统的研究出发,对目前几种常见的单点登录方案进行了分析,提出了一种基于.Net的单点登录Web服务方案,可以方便用户对资源的访问,增强用户访问站点的安全性。详细介绍了该方案的流程设计及实现方式,并对该方案的安全性进行了分析。  相似文献   

H_∞ filtering for nonlinear systems via neural networks     

Xiaoli Luan  Peng Shi 《Journal of The Franklin Institute》2010,347(6):1035-1046

A novel H_∞ filter design methodology has been presented for a general class of nonlinear systems. Different from existing nonlinear filtering design, the nonlinearities are approximated using neural networks, and then are modeled based on linear difference inclusions, which makes the structure of the desired filter simpler and parameter turning easier and has the advantages of guaranteed stability, numeral robustness, bounded estimation accuracy. A unified framework is established to solve the addressed H_∞ filtering problem by exploiting linear matrix inequality (LMI) approach. A numerical example shows that the filtering error systems will work well against bounded error between a nonlinear dynamical system and a multilayer neural network.  相似文献   

Robust orbital transfer for low earth orbit spacecraft with small-thrust     

Xuebo Yang  Peng Shi 《Journal of The Franklin Institute》2010,347(10):1863-1887

This paper studies the problem of robust orbital control for low earth orbit (LEO) spacecraft rendezvous subjects to the parameter uncertainties, the constraints of small-thrust and guaranteed cost during the orbital transfer process. In particular, the rendezvous process is divided into in-plane motion and out-plane motion based on C-W equations, and the relative motion models with parameter uncertainties are established. By considering the property of null controllable with vanishing energy (NCVE), the problem of orbital transfer control with small thrust and bounded control cost is proposed. A new Lyapunov approach is introduced, and the controller design problem is cast into a convex optimization problem subjects to linear matrix inequality (LMI) constraints. With the obtained controller, the orbit transfer process can be accomplished with small thrust and the control cost has an upper bound simultaneously. Different possible initial states of the transfer orbit are also analyzed for the controller design. An illustrative example is provided to show the effectiveness of the proposed control design method, and the different performances caused by different initial states of the transfer orbit are illustrated.  相似文献   

Observer-based sliding mode control for a class of discrete systems via delta operator approach     

Hongjiu Yang  Peng Shi 《Journal of The Franklin Institute》2010,347(7):1199-1688

In this paper, an observer-based sliding mode control (SMC) problem is investigated for a class of uncertain delta operator systems with nonlinear exogenous disturbance. A novel robust stability condition is obtained for a sliding mode dynamics by using Lyapunov theory in delta domain. Based on a designed sliding mode observer, a sliding mode controller is synthesized by employing SMC theory combined with reaching law technique. The robust asymptotical stability problem is also discussed for the closed-loop system composed of the observer dynamics and the state estimation error dynamics. Furthermore, the reachability of sliding surfaces is also investigated in state-estimate space and estimation error space, respectively. Finally, a numerical example is given to illustrate the feasibility and effectiveness of the developed method.  相似文献   

民主精神与科学创新——纪念竺可桢诞辰120周年          下载免费PDF全文

施雅风 《中国科学院院刊》2010,25(4):454-460

竺可桢院士是我国近现代最卓越、影响最深远的大科学家、大教育家之一。2010年3月7日是竺先生诞辰120周年,在改革开放的今天纪念竺可桢先生具有特殊的意义。竺先生自1921年在南京前东南大学创  相似文献   

浅谈藏文班学生作文的指导     

施以平 《西藏科技》2010,(4):30-30,33

写一篇好作文,这是许多同学梦寐以求的。藏文班的同学许多都怕写作,其实,作文即生活,写作和我们平常说话一样,只不过是一种表达而已,只要我们能做个生活的有心人,多多阅读,有目的地进行汉语说话训练,并养成写日记的好习惯,那么,即便是从小说藏语的同学,写一篇像样的汉语作文也不见得是件难事。  相似文献   

公共危机事件网络舆情应对机制及策略研究   总被引：3，自引：0，他引：3  

史波 《情报理论与实践》2010,33(7)

公共危机事件网络舆情研究是公共危机管理研究中一个新的和重要的组成部分.在对网络舆情演变机理进行归纳总结的基础上,分析了应对机制与演变机理之间的内在关系,并提出了"四位一体"的应对机制体系框架.从管理运行机制、预警机制、处置机制和善后机制4个方面,系统地提出了公共危机事件网络舆情的应对策略.  相似文献   

制约中国生物技术产业发展的八大因素     

殷实 《内蒙古科技与经济》2010,(8):49-50

文章在阐述了中国生物技术产业现状的基础上,对制约中国生物技术产业发展的因素进行了分析。  相似文献   

地方本科院校信息管理与信息系统专业课程体系设计     

吕永林  师薇 《现代情报》2010,30(11):128-130

地方本科院校的人才培养目标是应用型人才。本文结合地方本科院校发展现状和信息管理与信息系统专业的人才培养特点,分析了地方本科院校信息管理与信息系统专业的培养目标定位和现行课程体系存在的主要问题,提出了构建面向能力培养、多学科融合,具有专业特色的能力型课程体系。  相似文献   

买方市场势力、市场竞争环境与研发投入——基于高新技术上市公司的经验证据     

郭晓玲  李凯  石俊国 《科研管理》2021,42(11):129-136

  客户作为企业重要的利益相关者,对企业行为具有广泛而深刻的影响。买方市场势力是客户的重要特征之一,对企业的创新决策发挥着不可忽视的作用。本文以2012—2016年沪深两市A股中的610家高新技术企业上市公司为样本,从市场竞争强度和市场动态性两个角度实证检验了不同市场竞争环境下买方市场势力对企业创新研发投入的影响。结果表明：市场竞争程度越激烈,买方市场势力对创新研发投入产生的“促进激励效应”越明显;企业所处行业的市场动态性越高,买方市场势力对创新研发投入产生的“促进激励效应”越显著。  相似文献