科学发展观与初次分配和再分配

结合科学发展观理论,分析了我国不同时期国民收入中初次分配与再分配存在的问题,探讨了在当前形势下政府如何在分配领域处理好效率和公平的关系.     

企业计算机网络安全防御体系的构建

随着计算机网络的发展,网络安全问题日益突出。针对铁路计算机网络安全的现状,从网络安全技术、安全管理角度论述了构建企业内部计算机网络安全防御体系的策略。     

浅析城乡居民收入差距的现状及对策

介绍了山西省定襄县城乡居民收入差距持续拉大的现状,分析了城乡居民收入差距形成的原因,提出了缩小城乡收入差距的几点建议。     

MIPv6网络中蠕虫传播模型的构建与仿真

为了防止MIPv6中蠕虫的传播,基于MIPv6网络环境,提出一种新型的蠕虫MIPv6-Worm和MIPv6节点接触频率的计算方法,对MIPv6网络中蠕虫的传播策略进行了分析和研究,建立了MIPv6网络蠕虫传播模型--MWM.仿真结果显示:MIPv6-Worm在MIPv6网络中传播的初期,在117 s时达到传播的顶峰,在传播后期所有节点最终都转为免疫状态;MIPv6-Worm传播概率与节点通信半径、易感节点分布密度、节点运动速度均成正比.该模型较好地模拟MIPv6网络中蠕虫的传播规律,为采取有效措施防止MIPv6中蠕虫的大范围传播提供了理论依据.     

身份认证方案的安全性分析

针对入侵容忍身份认证方案的安全性进行了详细分析,并用状态转移图描述了系统的安全行为.该方案的特点是基于Shamir秘密共享算法将用户密码分片后存储在多个认证服务器中,使得少数服务器受到入侵时仍能继续提供正确的认证服务,且在认证身份时不需要重构用户原来的密码数据,提高了认证系统的可用性、完整性和机密性.     

Climate change impacts on crop yield,crop water productivity and food security-A review

This paper provides a comprehensive review of literature related to the assessment of climate change impacts on crop productivity using climate,water and crop yield models.The existing studies present that climate change models with higher spatial resolution can be a way forward for future climate projections.Meanwhile,stochastic projections of more than one climate model are necessary for providing insights into model uncertainties as well as to develop risk management strategies.It is projected that water availability will increase in some parts of the world,which will have its own effect on water use efficiency and water allocation.Crop production can increase if irrigated areas are expanded or irrigation is intensified,but these may increase the rate of environmental degradation.Since climate change impacts on soil water balance will lead to changes of soil evaporation and plant transpiration,consequently,the crop growth period may shorten in the future impacting on water productivity.Crop yields affected by climate change are projected to be different in various areas,in some areas crop yields will increase,and for other areas it will decrease depending on the latitude of the area and irrigation application.Existing modelling results show that an increase in precipitation will increase crop yield,and what is more,crop yield is more sensitive to the precipitation than temperature.If water availability is reduced in the future,soils of high water holding capacity will be better to reduce the impact of drought while maintaining crop yield.With the temperature increasing and precipitation fluctuations,water availability and crop production are likely to decrease in the future.If the irrigated areas are expanded,the total crop production will increase;however,food and environmental quality may degrade.     

基于SNMPv3协议的校园网防火墙与入侵检测联动系统构建

围绕高校网络系统的安全问题,通过基于SNMPv3协议的网络管理平台使防火墙与入侵检测系统产生联动,构建一个动态、实时的,能够实现网络安全整体化、立体化需求的网络系统安全框架,为校园网络安全提供一种解决方案.     

齐齐哈尔市空间生态规划探究

生态安全格局是维持生态系统稳定和物种多样性的有效方法.确定区域生态安全格局是区域规划、主体功能区划分的依据,运用主成分分析法对齐齐哈尔市辖区县的生态安全状况进行评价,划分出相对安全等级,提出了基于生态安全的市域空间格局概念规划.     

基于身份的前向安全和可公开验证签密方案

针对具有前向安全性和可公开验证的签密方案进行研究,基于Liber 和Quisquater的签密方案,给出了一个新的签密方案,并对所提出方案的安全性和效率进行了分析.结果表明:文章给出的签密方案实现了同时提供前向安全性和可公开验证性;而基于身份公钥密码和双线性对技术,使该方案又具有密钥长度短和密钥管理简单的特点,使其具有与LQ签密方案相当的效率.这种高效性和高安全性签密方案的提出,不仅对相关公开问题的解决具有一定理论意义,同时文中签密方案能更好的满足电子商务等实际应用的高安全需求,因此也具有一定应用价值.     

INTELLIGENT SECURITY SYSTEMS ENGINEERING FOR MODELING FIRE CRITICAL INCIDENTS： TOWARDS SUSTAINABLE SECURITY

An intelligent security systems engineering approach is used to analyze fire and explosive critical incidents, a growing concern in urban communities. A feed-forward back-propagation neural network models the damages arising from these critical incidents. The overall goal is to promote fire safety and sustainable security. The intelligent security systems engineering prediction model uses a fully connected multilayer neural network and considers a number of factors related to the fire or explosive incident including the type of property affected, the time of day, and the ignition source. The network was trained on a large number of critical incident records reported in Toronto, Canada between 2000 and 2006. Our intelligent security systems engineering approach can help emergency responders by improving critical incident analysis, sustainable security, and fire risk management.