一种基于聚类与关联规则算法的DDoS攻击检测模型     

钟锐 《赣南师范学院学报》2009,30(6):84-88

分布式拒绝服务（Distribute Denial of Service）攻击是当前主要的网络安全威胁之一．本文分析了DDoS攻击的本质特征,提出了一种基于数据挖掘算法的DDoS攻击检测模型．该模型使用聚类算法与关联规则对网络流量与网络数据包连接状态分别建立特征模型,并确定DDoS攻击的检测阈值．实验表明,该检测模型能够实时有效的检测DDoS攻击．  相似文献   

基于．NET Remoting三层分布式信息管理系统的设计与实现     

孟亚辉  杨镇育 《茂名学院学报》2009,19(4):48-51,59

以一个房地产中介管理系统设计为背景,探讨了基于．NET Remoting三层分布式的信息管理系统设计的过程和相关思路,说明了使用Remoting技术可以非常便捷地构建分布式的信息管理系统。  相似文献   

(Un)Critical times? Situating distributed leadership in the field     

Howard Youngs 《Journal of educational administration and history》2009,41(4):377-389

It is time to situate distributed leadership as a critical conceptualisation of school leadership; its popularisation has generally preceded conceptual and empirical development. Over the last 10 years distributed leadership has often been presented as a new construct of school leadership, though critique against education policy reforms and conceptual and historical links to the wider leadership field have generally been underemphasised. The theorisation and research of distributed leadership is currently situated at a critical point in its development; it is at the ‘crossroads’ of where it could dominantly be situated in the field of school leadership. A review of the literature and research suggests that distributed leadership is tending towards an uncritical position that is decoupled from critique of past and present education reforms and predominantly silent on how power relations at the local school level shape leadership activity.  相似文献   

Public service reform in education: why is progress so slow?     

Bernard Barker 《Journal of educational administration and history》2009,41(1):57-72

This case study examines why public‐sector reform in education often fails to deliver expected performance gains. Longitudinal evidence from a secondary comprehensive located in a former coalfield is used to identify constraints that frustrate government policies. Although the head and senior staff at Norcross School adopted transformational, distributed modes of leadership and implemented a rigorous target‐setting regime, the expected increase in effectiveness has not materialised. This disappointment is explained in relation to the flawed assumptions of the result‐driven effectiveness agenda, the resistance arising from continuing structural inequalities in society, and the hyperactive complexity of New Labour’s approach to managing public services. The study concludes that as the assessment regime in England provides an unreliable picture of student progress, there is no stable basis for judging the success of reform, particularly when perceived improvements in student experience are qualitative in nature.  相似文献   

Application of developed Grid-GA distributed hydrologic model in semi-humid and semi-arid basin   总被引：1，自引：0，他引：1  

王莉莉  李致家  包红军 《天津大学学报(英文版)》2010,16(3):209-215

A grid and Green-Ampt based(Grid-GA)distributed hydrologic physical model was developed for flood simulation and forecasting in semi-humid and semi-arid basin. Based on topographical information of each grid cell extracted from the digital elevation model (DEM) and Green-Ampt infiltration method, the Grid-GA model takes into consideration the redistribution of water content, and consists of vegetation and root interception, evapotranspiration, runoff generation via the excess infiltration mechanism, runoff concentration, and flow routing. The downslope redistribution of soil moisture is explicitly calculated on a grid basis, and water exchange among grids within runoff routing along the river drainage networks is taken into consideration. The proposed model and Xin’anjiang model were applied to the upper Lushi basin in the Luohe River, a tributary of the Yellow River, with an area of 4 716 km2 for flood simulation. Results show that both models perform well in flood simulation and can be used for flood forecasting in semi-humid and semi-arid region.  相似文献   

基于Windows CE构建嵌入式Web Services     

王建兴  马慧梅  裴丽鹊 《闽江学院学报》2010,31(2):66-70

在嵌入设备之间使用Web Services可以解决分布嵌入系统之间协同工作的问题．介绍了在Windows CE上构建嵌入式Web Services的基本框架,给出了3个实现方案,并对方案进行分析,为嵌入应用上构建Web Services提供一些设计参考．  相似文献   

微型冷热电联产系统动力装置的参数优化     

李应林  张小松 《东南大学学报》2010,26(2):297-301

建立了内燃机的通用数学模型,提出了内燃机的运行经济区.得出了改装后的LJ276M型内燃机的数学模型,并界定了此内燃机的运行经济区的边界范围,分析了此内燃机的运行优化曲线和最佳运行工况点.针对动力系统的冷热电、热电和供电3种操作模式,分别建立了能量转换数学模型,优化了动力装置的内燃机/变速箱传送比ies、电动机/变速箱传送比ims和电动机/内燃机传送比ime.结果表明：在冷热电模式下,ies和ims的优化值分别为2.9和1;在热电模式下,当动力系统需求负荷小于内燃机运行经济区的下限值时,ime取1,而当动力系统需求负荷超过内燃机运行经济区的下限值时,ime取0.85;在供电模式下,ims的最优值取2.5.  相似文献   

学校分布式领导概念新思维与领导力实践体系的集成     

蒋园园 《煤炭高等教育》2010,28(2):22-24

分布式领导是教育管理中一个新兴的领导学研究领域。面对复杂多变的学校环境,分布式领导是优化组织决策、促进教师员工参与管理的重要领导模式。因此,当学校处于变革发展的条件下,面临加倍动荡的环境时,必须用新的思维整合分布式领导概念,将领导者、追随者和情境放在一起理解。以形成更有效的学校组织结构和流程。  相似文献   

基于三维重建的分布式卫星SAR干涉测高模型及误差分析     

胡继伟  洪峻 《中国科学院大学学报》2011,28(4):489-497

基于InSAR目标三维重建原理对分布式卫星SAR干涉测高系统模型及工作原理进行了分析,给出了完整的目标位置三维重建闭合形式解;并对影响三维重建精度的主要误差源——基线矢量误差和干涉相位误差进行了详细分析;最后通过仿真分析了基线矢量误差和干涉相位误差特性,从而为系统参量定标及其校正提供了基础.  相似文献   

分布式印刷型文献储存库的运行模式和机制研究     

赵伯兴  方向明  张海霞 《图书情报工作》2010,54(11):23-43

分析国外低利用率文献合作储存库发展缓慢的原因,并针对我国图书馆实际提出建立分布式文献储存库的构想;在阐述分布式储存库运行模式和机制的  相似文献