简介：介绍了SYNFlood攻击的基本原理、描述了SYNFlood攻击对Windows系统的影响；介绍了在Windows系统上几种比较有效的防御措施。

简介：为了有效防御SYNFlood攻击，同时降低防火墙的压力，提出一种防火墙代理的防御SYNF100d攻击机制，并在Linux平台上通过增加防火墙过滤钩子块和修改服务器协议栈进行了实现。该机制是对SYN中继的改进，避免了防火墙与服务器之间的三次握手过程和修改TCP数据包的序列号及确认号的操作。实验结果表明，该机制能够大幅降低防火墙资源消耗，同时具有更好的防御效果。

简介：Comparedwithurbanfloods,dam-breakfloodsareassociatedwithgreateruncertainties,includingvariabledam-breakmodesandhydrologicalcharacteristics,soconventionalfloodestimationmethodscannotbedirectlyappliedintheestimationofdam-breakfloodloss.Inparticular,thereisscantinformationregardingtheconditionsofaffectedareaandhydrologicalcharacteristicsinsouthwestChina.Inthispaper,weintroduceanintegratedmodelforestimatingfloodlossthatisadaptedtothemountainousregionsofsouthwesternChinainlightoftherelativelackofavailableinformation.Thismodelhasthreemajorcomponents:abasicinformationmodel,adam-routedfloodpropagationsimulationmodel,andalossestimationmodel.Weestablishedthebasicinformationmodeldespitetherelativelackofavailableinformationusing3Stechnology[remotesensing(RS);geographicalinformationsystem(GIS);globalpositioningsystem(GPS)],dataminingtechnology,andstatisticalanalysistechniques.Ourdam-routedfloodpropagationsimulationmodelconsistsofmajorhydrologicprocessesandtheirgoverningequationsforflowpropagation,whichwesolveusingfinite-differenceschemes.Inthismodel,thefloodpropagationareaisdividedintogridsandeachgridisdeterminedbythecharacteristicparametersobtainedfromthepropagationsimulation.WepresentacasestudyoftheLianghekouhydropowerstationinSichuanProvince,Chinatoillustratethepracticalapplicationofthisintegratedmodelforlifelossestimation.