分组的端到端延时上限

研究了分组交换网络中分组的端到端延时上限。证明了在节点处理速率恒定的情况下，一个流的最大分组在除首节点外的任意节点都不会遭遇队列延时，根据此结论得到了该流任意分组的端到端延时上限。将该结果推广到实际网络中，得到了当多个流共享同一条传输路径时任意流任意分组的端到端延时上限。模拟实验结果验证了理论推导公式的正确性。     

电能质量扰动分类的贝叶斯方法

随着非线性负荷的大量使用,电能质量问题已日益受到关注．对各种电能质量扰动进行分类,是采取适当措施降低扰动带来影响的前提．小波包是在小波变换的基础上发展起来的,能够提供更为丰富的时频信息．为此,对电能质量扰动信号进行小波包分解,分别以小波包分解终结点的能量和熵作为特征向量。用贝叶斯分类器进行分类识别,对扰动分类做出了仿真分析,仿真结果验证了该方法的有效性．通过与Fisher分段线性分类器进行比较,表明以熵为特征向量的贝叶斯分类方法有较高的识别正确率．     

小波包基函数的构造和相应的性质研究

针对Ｄａｕｂｅｃｈｉｅｓ所给出的滤波器系数，构造了具有有限紧支集的小波包基，并对其性质进行了研究，特别是建立了小波包基函数的消失矩阶数的公式和中心频率的递推关系公式，这对压缩奇异积分算子、信号的时频分析等问题将是十分有用的。     

基于小波包变换及改进阈值法则的水声信号压缩

文中提出一种将小波包变换与改进的能量保留阈值法相结合的水声信号压缩方法,并讨论了该方法实现过程中小波包的选取、小波包分解算法、改进的能量保留阈值确定等问题,最后进行了仿真分析．仿真结果表明,本算法对水声信号压缩编码效果较为理想．     

基于加速引擎的防火墙部署方案

文章提出一种提升防火墙数据吞吐量的新方法,引入一台加速引擎的设备,通过实时学习模仿防火墙的安全策略,协同防火墙共同处理网络数据包,降低需要防火墙处理的数据包数量,克服了传统防火墙易于产生性能瓶颈的问题;同时基于Linux/netfilter实现了一个原型系统,并验证了该方案的有效性和可行性。     

单向拓扑密集波分复用光分组交换网络结构及性能分析

提出了在单向网络拓扑下应用密集波分复用技术构造的多波长分组交换网络及其节点结构模型，在此基础上，应用简化的带缓存固定路由算法模拟了网络在稳态下的分组丢失率和归一化节点吞吐量等性能参数．模拟结果表明，密集波分复用(DWDM)技术的应用能使分组交换网络缓存数量急剧减少，整体性能大幅度提高．     

Features of the EAP events on the medium-range evolution process and the mid- and high-latitude Rossby wave activities during the Meiyu period

In this paper, features for the evolution of the East Asia/Pacific （EAP） events and their association with high- and mid-latitude Rossby waves during the Meiyu period are analyzed on the medium-range time scale, it is shown that life cycles of the positive and negative EAP events cannot be simply regarded as ＂mirror＂ each other. In the upper troposphere, downward propagations of Rossby wave packets both over high- and mid-latitude regions of Eurasian continent and over the Asian jet region are responsible for generating basic patterns of high- and mid-latitude anomaly centers of the events. In this layer, Rossby wave packets also propagate from the mid-latitude anomaly center to the high-latitude one. In the middle and lower troposphere, the formation of the subtropical anomaly center of the event is mainly attributed to the anomalous convective activity in the tropical Pacific warm pool. The northward Rossby wave energy dispersion from this center is favorable to the enhancement and maintenance of the mid-latitude anomaly center in the same layer. Finally, it might be hypothesized that typical features of the positive and negative EAP events in their mature phase result from the interaction between （or phase-locking of） respective anomalous circulations induced both by quasi-zonal Rossby wave packets embedded in upper troposphere westerly and by quasi-meridional Rossby wave packets in the background flow of the East Asian summer monsoon in the middle and lower troposphere.     

Intelligent Scheduling Controller Design for Networked Control Systems Based on Estimation of Distribution Algorithm

The use of communication networks in control loops has gained increasing attention in recent years due to its advantages and flexible applications. The network quality-of-service （QoS） in those socalled networked control systems always fluctuates due to changes of the traffic load and available network resources, This paper presents an intelligent scheduling controller design approach for a class of NCSs to handle network QoS variations, The sampling period and control parameters in the controller are simultaneously scheduled to compensate for the network QoS variations. The estimation of distribution algorithm is used to optimize the sampling period and control parameters for better performance. Compared with existing networked control methods, the controller has better ability to compensate for the network QoS variations and to balance network loads. Simulation results show that the plant setting time with the intelligent scheduling controller is reduced by about 64.0% for the medium network load and 49.1% for high network load and demonstrate the effectiveness of the proposed approaches.     

一种基于单播方式提高VoWLAN系统话音容量的方案设计

VoIP（IP语音）与WLAN（无线局域网）两者结合,产生了一种新型的无线话音传送平台：VoWLAN。针对WLAN的研究热点,分析了VoWLAN中存在的容量瓶颈,指出现有解决方案（M-M）存在的问题,提出一种基于单播方式提高VoWLAN话音容量的方案（U-M,Unicast Multiplexing）,对VoIP业务性能进行了理论分析和仿真验证。结果显示,U-M方案相对于传统方案提高系统话音容量近一倍,相对于M-M方案丢包率降低10％左右,较好地保证了VoIP业务的服务质量。该方案在以话音业务为主的VoWLAN中节省了系统的功耗,是一种性能优良 的提高VoWLAN系统话音容量的方案。     

基于小波包分析与BP神经网络的氧化铝熟料检测

利用小波包分析与BP(Back Propagation)神经网络相结合的算法,对氧化铝熟料检测的应用进行了研究.通过采集回转窑中氧化铝熟料下落碰撞窑壁产生的声音信号,利用小波包分析提取特征向量,根据氧化铝的烧结状况与声音信号特征向量的对应关系,提出建立BP神经网络模型.利用MATLAB对测试样本进行验证,结果表明BP神经网络模型在氧化铝熟料检测中具有可行性,而且具备一定的准确率.