可生存的开放式对等存储系统

现有对等存储网络不能保证用户文件在不可信节点上的机密性和安全性,而且仅采用低效的冗余副本方式保证其文件可用性。针对该问题,提出一种适用于不同用户需求的可生存性对等存储网络系统。分析结果表明,该系统能满足不同的需求场合,并能有效地保证存储网络的可生存性。     

网络存储系统可生存性定量评价研究

针对网络存储系统可生存性评价的局限性,提出一种网络存储系统可生存性定量评估方法。对灰色关联分析法进行改进,建立基于信息熵差的灰色关联分析法的定量评价模型,运用熵差计算出各关键服务的生存性态势变化。利用搭建的典型网络存储环境进行测试,结果表明,基于信息熵差的灰色关联定量分析方法对于网络存储系统的可生存性评价是准确、有效的。     

Dynamic Damage Recovery for Web Databases

In the web context, there is an urgent need for a self-healing database system which has the ability to auto- matically locate and undo a set of transactions that are corrupted by malicious attacks. The metrics of survivability and availability require a database to provide continuous services during the period of recovery, which is referred to as dynamic recovery. In this paper, we present that an extended read operation from a corrupted data would cause damage spread- ing. We build a fine grained transact...     

基于熵权法的地域通信网节点重要性评价方法

对于地域通信网网络节点重要性权重的确定,文章提出了最优嫡权重要性评价法,将网络中节点的运行情况、节点交换能力、抗毁能力、设施费用、节点通信能力这五项指标和节点的拓扑重要性综合反映到节点重要性权重当中,使得节点重要性更加准确、符合实际应用。同时为了更加准确的评估节点的重要性,采用最优组合赋权的方法,将节点拓扑结构重要性权重（客观评价）与节点的嫡权重要性（主观评价）进行组合给出节点组合权重。     

面向可生存性的网络攻击分类方法

网络攻击分类是研究网络攻击特点及其防护方法的前提,介绍了网络攻击分类的研究现状,对已有网络攻击分类方法进行了分析比较,提出了一种面向网络可生存性研究的网络攻击分类方法,并用实例说明了该分类方法的分类过程。该方法对网络防护人员进行网络可生存性提升很有帮助,为他们有针对性地研究网络可生存性技术提供了依据。     

无线传感器网络可生存路由算法

提出基于功率控制的分布式可生存路由算法,通过节点分布密度确定初始发射功率,利用转发数据进行实时反馈以动态调整节点覆盖范围,引入专用转发簇头减少普通节点的能耗。实验证明,该算法在节点分布不均、部分节点失效等情况下仍能保证低能耗和可靠传输,具有良好的可生存性。     

可生存系统的分层冗余结构与实现

传统网络安全技术无法保证某些实时系统及统可生存能力方法的研究分析的基础上,提出了可生存系统的分层冗余结构模型.该模型在各个层次上引进异构组件及互监视机制,既可避免基于主动响应的可生存系统检测能力和响应速度的缺陷,又能解决基于同构冗余的可生存系统无法抵抗可重复攻击的问题.实践结果表明,与传统的可生存系统模型相比,提出的分层冗余结构在系统受到恶意攻击或系统部分组建受损的情况下仍能维持一定程度的工作并持续提供服务.     

一种有效的受损数据隔离方法

数据库可生存性要求在发现受损数据时采用受损限制技术,以尽快隔离受损数据从而防止由于数据共享造成受损范围进一步扩大带来的危害。在DBMS内部设计并实现了一种受损数据隔离策略语言,并提出了一种有效的受损数据隔离算法。该算法使用SQL语句动态替换技术最大限度保证隔离阶段用户请求数据的完整性,并通过子查询动态视图替换法保证数据隔离的有效性。基于TPC-W基准的吞吐率测试证明,提出的数据隔离算法具有较高的运行时效率。     

Additional helmet and pack loading reduce situational awareness during the establishment of marksmanship posture

Abstract

The pickup of visual information is critical for controlling movement and maintaining situational awareness in dangerous situations. Altered coordination while wearing protective equipment may impact the likelihood of injury or death. This investigation examined the consequences of load magnitude and distribution on situational awareness, segmental coordination and head gaze in several protective equipment ensembles. Twelve soldiers stepped down onto force plates and were instructed to quickly and accurately identify visual information while establishing marksmanship posture in protective equipment. Time to discriminate visual information was extended when additional pack and helmet loads were added, with the small increase in helmet load having the largest effect. Greater head-leading and in-phase trunk–head coordination were found with lighter pack loads, while trunk-leading coordination increased and head gaze dynamics were more disrupted in heavier pack loads. Additional armour load in the vest had no consequences for Time to discriminate, coordination or head dynamics. This suggests that the addition of head borne load be carefully considered when integrating new technology and that up-armouring does not necessarily have negative consequences for marksmanship performance.

Practitioner Summary: Understanding the trade-space between protection and reductions in task performance continue to challenge those developing personal protective equipment. These methods provide an approach that can help optimise equipment design and loading techniques by quantifying changes in task performance and the emergent coordination dynamics that underlie that performance.     

IP over WDM网络中可生存的路由选择策略

在IPoverWDM网络中,单链路故障可能会使虚拓扑变得不连通而导致IP网络无法恢复受损业务,在设计虚拓扑时必须避免这种情况。SVTMA算法采用负载均衡策略,在保证网络生存性的同时,严格遵守物理链路的容量限制。实验表明,使用SVTMA算法进行虚拓扑设计所需的波长数小于SMART算法所需的波长数,使得整个网络的负载分布更加均衡。