计算机局域网网络的安全现状与对策分析

在现代企业中,随着办公自动化进程的不断深入,计算机局域网得到了普遍的发展,在很大程度上提高了工作效率。但是局域网技术在为工作带来便利的同时,安全问题也是比较严重的。本文主要探究的是计算机局域网网络的安全现状,并提出了相应的对策和解决措施。     

江苏省地震前方指挥车应急数据信息通信方式的实现

前方指挥车是在有地震灾害事件发生时,能够立即响应,并快速到达地震震中所在地,立即开展现场信息汇集与共享、地震灾情动态评估和修正、辅助决策建议及时生成、现场资源调度和管理,实现前方指挥部与现场工作人员、国家指挥部、区域指挥部的不同应用系统之间的数据信息的共享和传递.本文主要介绍前方指挥车两种不同应急通信方式,并讨论各自的优缺点.     

浅谈俄罗斯银行信息安全体系的建立

本文主要从俄罗斯银行信息安全管理体系（ISMS）建立准则,ISMS成熟度等级,与信息安全体系相关的法律法规三个方面来介绍俄罗斯银行信息安全体系的建立。     

校园网网络计费相关的网络管理问题研究

网络流量计费是一种常见的网络管理手段。网络计费中经常遇到对流量统计结果的质疑、IP地址抢夺和账号被盗等三类问题。针对上述三类问题,通过网络管理的手段给出了分别的解决方案。     

基于Linux平台应用于路由器的B/S视频监控系统

在智能家居和物联网逐渐形成成熟产业链的今天,视频监控系统是其中最为重要的应用之一。在关公安全、交通调度、医疗卫生、系统控制等诸多领域,部署一款合适的视频监控系统,是使得这个系统保持高效运转的前提和保障。本文基于Linux系统和路由器的结合,设计了一种实时、有效的视频监控系统。系统很好的控制了硬件成本,在软件架构上使用了成熟且资源开销低的B／S方式。     

基于RFID技术的景区流量导向系统

基于RFID技术的景区流量导向系统能通过技术应用,依靠阅读器收集到标签内的信息来判断景区的各个景点的人流情况,并通过网页查询、电子显示屏和广播等方式告知游客各景点的游客饱和度信息,对游客的流量趋向进行指引,保证游客在每个景点都可以畅通愉快的游玩。     

水基Fe3O4磁流体的制备工艺研究

用共沉淀法制备Fe3O4磁流体,总结出用十二烷基磺酸钠与聚乙二醇作为表面活性剂制备水基磁流体的合适条件:(1)反应温度为室温或不高于35℃;(2)表面活性剂十二烷基磺酸钠的最佳用量为0.0030～0.0040 g/80 mL;(3)第一次包裹的最佳pH为9～10;(4)聚乙二醇作为第二次包裹的表面活剂时,体系最佳温度为40℃左右;(5)表面活性剂聚乙二醇的最佳用量为0.0050～0.0060 g/80 mL。通过实验制得了能稳定存在180 d的水基磁流体。并用透射电镜、红外光谱、分光光度计、古埃磁天平等进行了初步表征。     

A generalized robust H ∞ filtering for singular Markovian jump systems and its applications

In this paper, a generalized robust H _∞ filtering method is proposed for a class of singular Markovian jump systems, whose generality is mainly embodied that the desired filter could bear perturbances in terms of uncertainties on its parameter matrices. Firstly, an LMI condition of robust mode‐dependent filter is developed. Based on the given result, a new approach to mode‐independent H _∞ filter is presented, which establishes a direct connection between mode‐dependent and mode‐independent filters. Secondly, when the transition rate matrix is with elementwise bounded uncertainties or partially unknown, sufficient conditions of such robust mode‐dependent and mode‐independent filters are all developed within LMI frameworks. Finally, a numerical example is used to demonstrate the effectiveness of the proposed methods. Copyright © 2013 John Wiley & Sons, Ltd.     

Polypropylene photostabilization by hindered amines in the presence of acidic species

Some volatile acids were found to dramatically reduce the effectiveness of additives based on 2,2,6,6-tetramethylpiperidine as photostabilizers for polypropylene films. Strong acids such as HCl, HBr, and HNO₃ had the largest effect with sulfurous acid somewhat less detrimental. Weak organic acids did not impair the effectiveness of the hindered amine light stabilizers. The role of acid concentration and contact time were explored for the HCl–piperidyl additive system. Secondary and tertiary amines were included in the study as well as oligomeric additives and an N-oxyl derivative. The latter is less basic than the free amines, and it was correspondingly less effected by acid exposures. The possibilities for acid exposure during the compounding, fabrication, and use of stabilized polyolefin articles is discussed as well as the effects of acids in terms of proposed stabilization mechanisms for the hindered amines.     

Containment control of multi‐agent systems by exploiting the control inputs of neighbors

This paper studies the containment control problem for multi‐agent systems consisting of multiple leaders and followers connected as a network. The objective is to design control protocols so that the leaders will converge to a certain desired formation while the followers converge to the convex hull of the leaders. A novel protocol is proposed by exploiting the control input information of neighbors. Both continuous‐time and discrete‐time systems are considered. For continuous‐time systems, it is proved that the protocol is robust to any constant delays of the neighbors' control inputs. For discrete‐time systems, a sufficient condition on the feedback gain for the containment control is given in terms of the time delay and graph information. Some numerical examples are given to demonstrate the results. Copyright © 2013 John Wiley & Sons, Ltd.