传感器网络中一种非均匀的节点部署算法

传感器节点将收集到的数据传输到簇头,簇头将数据包聚合后再发送到基站。远离基站的簇头,因发送数据的能耗太高而提早死亡。为此,在研究了传感器网络中节点的能耗后,提出一种非均匀的节点部署算法,得出了一个部署传感器节点的密度函数,在远离基站的区域部署较多的节点。仿真实验表明,非均匀的节点部署算法能有效延长网络的生命周期。     

基于LonWorks技术的楼宇自控系统设计要点分析

本文主要分析楼宇自控系统的实际需求，介绍了LonWorks现场总线技术及其通讯协议的特点，并阐述利用LonWorks技术进行楼宇自控系统设计的要点。     

内容中心网络中基于节点相似度的协作缓存算法

针对内容中心网络中ALWAYS缓存策略节点存储空间利用率低、内容访问时延大、整体网络缓存性能低下的问题,提出了一种依据节点相似度的协作缓存算法。该算法优先将兴趣包转发至最相似节点,增大相关请求的就近响应概率;同时保证在缓存决策中的同一副本在协作节点间不重复存储,在降低冗余的同时增加了缓存多样性。实验结果表明,与现有算法相比,该算法在减少路由跳数和请求时延的同时提高了缓存命中率。     

基于Seneca微服务的过程监测系统

针对传统监测监控与数据管理应用系统架构复杂,前后端开发技术不一致,通讯协议不统一,难以实现高并发请求的问题,在高性能服务器平台Node.js下,使用全新的微服务架构和Seneca框架技术与监测监控技术相结合,使用统一的Node.js编程模式,标准化的REST API通讯协议,实现了低成本、高性能、易维护和安全性的监测与数据管理的企业级应用.     

基于P2P的网络流媒体系统及其自适用算法研究

G-N系统是基于P2P模式构建一种拓扑结构,采用节点自适应算法,更好地处理节点与其相邻节点之间的关系,并能够充分利用节点的异构能力,维持更多的连接,获得更多的相关资源。     

Two-dimensional nonsteady viscous flow simulation on the Navier-Stokes Computer miniNode

The needs of large-scale scientific computation are outpacing the growth in performance of mainframe supercomputers. In particular, problems in fluid mechanics involving complex flow simulations require far more speed and capacity than that provided by current and proposed Class VI supercomputers. To address this concern, the Navier-Stokes Computer (NSC) was developed. The NSC is a parallel-processing machine, comprised of individual Nodes, each comparable in performance to current supercomputers. The global architecture is that of a hypercube, and a 128-Node NSC has been designed. New architectural features, such as a reconfigurable many-function ALU pipeline and a multifunction memory-ALU switch, have provided the capability to efficiently implement a wide range of algorithms. Efficient algorithms typically involve numerically intensive tasks, which often include conditional operations. These operations may be efficiently implemented on the NSC without, in general, sacrificing vector-processing speed. To illustrate the architecture, programming, and several of the capabilities of the NSC, the simulation of two-dimensional, nonsteady viscous flows on a prototype Node, called the miniNode, is presented.     

基于节点失效的弹性供应链应急管理策略

研究网络正常运行和有单一节点失效情况下供应链的应急调度问题,建立了在有限资源约束下单目标成本优化数学模型,以实现供应链运行总成本最小．采用ＣＰＬＥＸ 软件求解模型,得到应急调度计划方案．数值仿真结果表明了应急调度方法的有效性和实用性．     

P2P网络模式下测量设备溯源系统设计

本文介绍一种P2P网络结构下的分布式测量设备溯源管理系统的设计。围绕P2P网络架构的特点,分析了采用P2P结构设计本系统的主要原则和在小型分布式应用系统的实现技术。通过系统的开发实践,解决了P2P集中式架构下的节点通信、信息同步和任务协同等技术问题。实验证明,P2P网络结构下的分布式溯源管理系统较好的满足了一般企事业单位的业务需要。     

The influence of node sequence and extraneous load induced by graphical overviews on hypertext learning

The effects of four hypertext learning environments with a hierarchical graphical overview were studied on the coherence of the node sequence, extraneous load and comprehension. Navigation patterns were influenced by the type of overview provided (i.e., dynamic, static) and whether navigation was restricted (i.e., restricted, non-restricted). It was hypothesised that redundant use of the overview for inducing a high-coherence reading sequence would result in high extraneous load and low comprehension. Coherence was higher in the dynamic than in the static conditions. Coherence was also higher in the restricted than in the non-restricted conditions. Mental effort as a measure of extraneous load was higher at the end than at the beginning of the learning phase, especially in the dynamic restricted and the static non-restricted conditions, although there was no significant interaction. Comprehension was lowest in the dynamic restricted condition and highest in the dynamic non-restricted and static restricted conditions. Low comprehension in the dynamic restricted condition indicates that overviews can become redundant for reading sequence coherence, negatively impacting comprehension. The evidence suggests that severe restriction of navigation paths should be avoided and that continuous use of overviews such as in dynamic overviews may be detrimental to learning.     

IP返回跟踪DoS攻击的三种数据包标记算法

阐述了一种以数据包标记为基础的IP返回跟踪机制，并根据该机制给出了对付DoS(拒绝服务)攻击的三种数据包标记算法。