基于粗决策规则的无线DoS防御方法

针对当前防御DoS攻击方法因判定攻击帧合法性条件属性过多所导致DoS防御性能不足的问题,基于粗决策理论,利用粗决策规则方法,建立防御无线DoS攻击的模型,给出基于粗决策规则的防御DoS智能帧过滤算法(802.11w-SFF),并对该方法进行实验分析.802.11w-WiFi设备在攻击速率为250fps的情况下,未使用802.11wSFF方法时,TCP流量变为没有攻击时的16%,UDP丢失率上升为80%;使用802.11w-SFF方法后,802.11wWiFi设备的TCP/UDP数据通信性能没有受到DoS攻击的影响.实验分析说明802.11w-SFF方法应用于移动网络能有效地防御DoS攻击.     

Event-triggered fault-tolerant consensus control with control allocation in leader-following multi-agent systems

Science China Technological Sciences - Event-triggered consensus in leader-following multi-agent systems with actuator fault is considered in this paper, in which the fault investigated can be...     

基于网格的异构无线网络负载均衡算法

针对目前软负载均衡算法中无线资源统计不具有普适性,未考虑用户业务需求与异构资源单元差异性匹配的问题,根据网格计算的思想,在异构无线网络中提出了基于网格的负载均衡算法。该算法首先将无线资源映射成不同的三维资源单元,每个三维资源单元相当于一个网格。然后将业务分成不同的子业务流(数据包),统一分给不同的网格,实现业务的分布式分流,在保证用户QoS的情况下,实现网络的负载均衡。仿真结果表明:基于网格的负载均衡算法能够较好地均衡异构网络间的负载,降低负载偏离度,提高系统吞吐率。     

低压配电网通信信道传输特性仿真研究

配电网的高噪声、阻抗变化大以及高传输衰减是制约电力线通信发展的主要障碍。本文结合部分工程数据,对低压配电网的通信信道传输衰减特性进行了仿真研究。文中讨论了线路的参数计算、线路模拟试验、现场数据与模拟数据比较以及线路衰耗设计试验等内容,并给出了相关结论。     

Component based ant routing protocols analysis over mobile ad hoc networks

To deeply exploit the mechanisms of ant colony optimization （ACO） applied to develop routing in mobile ad hoe networks （MANETS）,some existing representative ant colony routing protocols were analyzed and compared.The analysis results show that every routing protocol has its own characteristics and competitive environment.No routing protocol is better than others in all aspects.Therefore,based on no free lunch theory,ant routing protocols were decomposed into three key components：route discovery,route maintenance （including route refreshing and route failure handling） and data forwarding.Moreover,component based ant routing protocol （CBAR） was proposed.For purpose of analysis,it only maintained basic ant routing process,and it was simple and efficient with a low overhead.Subsequently,different mechanisms used in every component and their effect on performance were analyzed and tested by simulations.Finally,future research strategies and trends were also summarized.     

OBS网络中基于OBS-PLR丢弃算法的可控QoS方案

研究了建立在经典服务质量QoS(QualityofService)基础上的比例QoS方案 ,并以此为理论依据 ,分析了主动丢弃算法在OBS(OpticalBurstSwitching)网络中支持比例QoS存在的问题 .针对这些问题 ,提出了光突发交换 成比例丢失率OBS PLR(OpticalBurstSwitching ProportionalLossRate)丢弃算法 ,以实现突发数据丢失率的可控、成比例 ,且不至于偏大 .理论分析及仿真结果都表明该算法提高了比例QoS控制的性能     

Reaching a stochastic consensus in the noisy networks of linear MIMO agents: Dynamic output-feedback and convergence rate

This paper addresses the leader-following consensus problem of linear multi-agent systems(MASs) with communication noise. Each agent's dynamical behavior is described by a linear multi-input and multi-output(MIMO) system, and the agent's full state is assumed to be unavailable. To deal with this challenge, a state observer is constructed to estimate the agent's full state. A dynamic output-feedback based protocol that is based on the estimated state is proposed. To mitigate the effect of communication noise, noise-attenuation gains are also introduced into the proposed protocol. In this study, each agent is allowed to have its own noise-attenuation gain. It is shown that the proposed protocol can solve the mean square leader-following consensus problem of a linear MIMO MAS. Moreover, if all noise-attenuation gains are of Q(t-β), where b∈(0,1), the convergence rate of the MAS can be quantitatively analyzed. It turns out that all followers' states converge to the leader's state in the mean square sense at a rate of O(t-β).     

Leader-following consensus of stochastic delayed multiagent systems with input saturation under self-triggered impulsive control

In this study, we investigate the self-triggered impulsive control for stochastic delayed multiagent systems with input saturation. We present a novel self-triggered mechanism using a comparison system method. The next triggering instant is predicted on the basis of agent dynamics knowledge and data obtained from the last triggering instant without real-time monitoring; thus, Zeno behavior is naturally avoided. By applying this new self-triggering mechanism, we provide some sufficient conditions for the mean-square consensus based on the stochastic differential theory, Lyapunov function theory, and linear matrix inequalities. Finally, we demonstrate the feasibility of our method by presenting numerical simulation results.     

Optimal operation of water distribution networks under local pipe failures

The optimal operation of water distribution networks under local pipe failures, such as water main breaks, was proposed. Based on a hydraulic analysis and a simulation of water distribution networks, a macroscopic model for a network under a local pipe failure was established by the statistical regression. After the operation objectives under a local pipe failure were determined, the optimal operation model was developed and solved by the genetic algorithm. The program was developed and examined by a city distribution network. The optimal operation alternative shows that the electricity cost is saved approximately 11%, the income of the water corporation is increased approximately 5%, and the pressure in the water distribution network is distributed evenly to ensure the network safe operation. Therefore, the proposed method for optimal operation under local pipe failure is feasible and cost-effective.     

以太网电路仿真E1实验平台的研究

主要介绍了TDMoE(基于以太网的电路仿真)技术,总结了该技术实现存在的关键问题,并给出了可行的解决方法。TDMoE作为一种新技术,相关协议正在逐步完善。本文提出了一种可升级的TDMoE技术实验平台,并以实现四路E1仿真为例,介绍了该实验平台的设计和实现方法。     

企业信息化环境下内部审计工作的思考

随着计算机、网络等信息技术的飞速发展,人们的日常生活和企业的生产经营都发生了变化,同时,企业的经营环境、内部控制等方面也受到不同程度的影响,所以,对企业内部审计如何规避风险也就提出了更高的要求。     

磁偶极子模型的无线传感器网络定位方法

针对无线传感器网络定位技术,提出了一种定位锚节点的新方法。通过对磁偶极子模型的分析,得出了在二维平面上随机撒播锚节点的情况下获得锚节点绝对位置的方法。采用Matlab仿真分析了该定位方法的性能。结果表明,该方法容易实现锚节点的重新替换工作。     

新形势下如何加强高校财务管理

随着我国社会主义市场经济体制的进一步完善、教育管理体制改革的不断深入,高校逐步从过去依靠国家财政拔款办学转向以国家拔款为主、多渠道筹措教育经费的方向发展。为适应这一形势的变化,高校应进一步转变观念加强财务管理,具体措施有：实行“一级核算,二级管理”的财务管理体制;实现财务管理工作职能和重点的转移;发挥校内结算中心的聚资、监督作用;加强校办产业的财务管理;加强财会队伍建设等方面     

ARROW-WTCP: A fast transport protocol based on explicit congestion notification over wired/wireless networks

An explicit congestion notification (ECN)-based distributed transport protocol,ARROW-WTCP (AcceleRate tRansmission towards Optimal Window size TCP for Wireless network),was proposed.The ARROW-WTCP enables feasible deployment of ARROW-TCP from wired to wireless networks by providing a joint design of source and router algorithms.The protocol obtains the actual capacity of the wireless channel by calculating the queue variation in base station (BS) and adjusts the congestion window by using the feedback from ...     

移动容迟网络中基于改进随机路点模型的移动连接路由

在移动容迟网络中,考虑到稀疏网络节点混存长时间被无效消息占用情况,将移动连接路由算法与倒数计时器和快速缓存释放策略相结合,提出了加速缓存释放的移动连接路由算法,并研究了节点移动速率、通信距离、节点数量、消息有效时间、场景尺寸等对算法性能的影响。结果表明:该路由算法在保证传输可靠性的前提下能够提高网络的传输效率。     

新形势下加强坪北青年职工思想教育的思考

目前,坪北青年的思想状况是价值取向日趋务实、缺乏进取之心、生活幸福指数不高、抗压能力较弱。要做好青年员工思想政治工作,就必须创新思想教育机制,提升青年思想素质;关注青年思想动态,重视青年身心健康;贴近青年现实需求,创新青年活动载体;创建人才成长通道,加快青年成长成才;建立好青年信息库,真正为青年服好务。     

综合物探方法在复杂条件下供水管网测漏中的应用

测漏技术因淡水资源的缺乏而越来越受到重视,但随着社会、经济的发展,工作条件的复杂对测漏技术提出了更高更苛刻的要求。本文对当前测漏技术做了全面分析概括,并以典型的工程实例,对复杂条件下综合物探测漏技术进行了论述和探讨。     

Safety modeling and protection for lithium-ion batteries based on artificial neural networks method under mechanical abuse

The safety of lithium-ion batteries under mechanical abuse has become one of the major obstacles affecting the development of electric vehicles.In this paper,th...