Nash equilibrium cooperative transmission strategy considering competition

In cooperative communications, employing the idle relay node for forwarding data can effectively improve the transmission rate and performance of the wireless networks. Therefore, various relay node selection algorithms are proposed. However, most of the existing algorithms just focus on the benefit caused by relay nodes, while ignoring the negative effect of the backoff duration time which does not exist in direct transmission, when more than one flow compete for the same relay node. To this end, considering both advantage and adverse impact caused by the relay node, we adopt the game-theoretic approach and propose a cooperative transmission strategy based on the Nash equilibrium, named the Nash Equilibrium Cooperative Transmission Strategy (NECTS). The NECTS can not only guarantee the gain of each flow, but also maximize the system performance, and improve the system throughput effectively. Simulation results show that the NECTS can take the advantage of cooperative communications. Meanwhile, it can avoid the unnecessary competition, and its performance outperforms that of the existing methods.     

海战场栅格节点的接入与迁移管理技术研究*

针对海战场作战平台中设备繁杂、异构的特点，栅格网络架构将各类作战平台设备以节点形式进行管理，但现有研究中尚缺乏具体的节点接入与迁移实现的流程方法与技术。论文针对上述问题，提出了海战场栅格节点接入与迁移的一种标准化流程与技术的实现方法，并利用仿真软件进行了实例的仿真验证，验证了节点接入与迁移标准化流程的可行性，并证明了其在技术上的可实现性。     

移动物料信息分布式传输方法及应用

在流程工业生产中,移动物料计量信息的传输普遍采用电台和无线模块。接收电台周围环境严重影响计量信息的传输效果,尤其是钢结构厂房、电磁干扰区内,数据传输过程中的丢包率、误码率相当严重。本文提出一种多节点分布式传输方法,根据各个生产作业区环境条件设置相应的WIFI节点数,实现对作业区的无线信号覆盖。网络覆盖区内无线模块、PDA终端(PDA)、终端查询设备通过节点工作频段和阵列天线自适应调节,实现数据传输最佳化。铜熔炼生产现场测试表明,此种传输方法可以有效消除周围环境的电磁干扰,数据丢包率低于0.1%。     

非均匀节点分布网络能量空洞攻击抑制仿真

针对传统非均匀节点分布网络能量空洞攻击抑制方法存在抑制效果差、响应时间长、能量空洞攻击抑制性能较差的问题,提出非均匀节点分布网络能量空洞攻击抑制方法。为了有效识别非均匀节点分布网络能量空洞攻击,需要获取OpenFlow交换机的流表项,分析非均匀节点分布下网络能量空洞攻击的特性,获取和非均匀节点分布网络能量空洞攻击相关的流表特征,根据相关特征的变化,对相关的训练样本进行分类,完成非均匀节点分布网络能量空洞攻击检测;根据检测结果,选用网络半径和数据流量监测,组建非均匀节点分布网络能量空洞攻击抑制模型,通过所组建的模型对不同类型的非均匀节点分布网络能量空洞攻击进行有效抑制。实验结果表明,所提方法的抑制效果较好,在不同节点数量下的响应时间较短,能量空洞攻击抑制性能较强。     

Efficient reliability analysis of dynamic k-out-of-n phase-AND mission systems

Motivated by real-world applications of satellites and wireless sensor networks, this paper models and evaluates a dynamic k-out-of-n phase-AND mission system (k/n-PAMS). The mission task conducted by a k/n-PAMS involves multiple consecutive phases; the mission is successful as long as the task is successful in any of the phases. Due to factors, such as scheduled maintenance, location changes in task execution during different phases, and resource sharing with other tasks, the total number of available components n for the considered mission task and the required number of working components k may change from phase to phase. In addition, due to varying load and working environments, component failure time distributions are also phase dependent. This paper proposes an analytical modeling approach based on multivalued decision diagrams (MDDs) for assessing reliability of the considered k/n-PAMS. The approach encompasses a new and fast MDD model generation algorithm that considers behaviors of all the mission phases simultaneously based on node labeling. As demonstrated through empirical studies on k/n-PAMSs with different sizes (different numbers of phases and different numbers of system components), the proposed algorithm is more efficient than the traditional phase-by-phase model generation method.     

P87C591在电力调度系统中的应用设计

简述了CAN现场总线和P87C591单片机的特点以及它们的优越性,并详细介绍了基于P87C591单片机的电力调度系统中智能测控点硬件电路设计及要注意的细节问题,最后给出了CAN控制器的初始化程序的流程图。     

MAPGIS中使用结点平差操作的问题分析及改进建议

主要介绍应用MAPGIS制图过程中，使用结点平差操作所产生的误差，如：改变了原线段的方向，区分割时。使弧段产生变形，从而使结点平差后的弧段，分割后的区的属性未接要求进行改变，并提出了消除这些误差的方法与建议。     

煤矿安全监测无线传感器网络节点定位技术

利用无线信号强度实现了煤矿安全监测无线传感器网络节点间的自定位，提出了提高定位精度的改进方案，并分析了不同因素对定位精度的影响．仿真结果表明，所提出的算法可以有效地提高无线传感器节点的定位精度，如在路径损耗标准偏差分别为4和6，滚动平均次数为10时，定位精度的相对误差分别从0.21和0.35左右下降到0.18和0.29左右.     

利用动态规划数学模型求最短路径

随着科技的发展 ,数学模型已广泛应用到社会生活的各个领域。文中介绍了数学模型的定义及建立动态规划数学模型步骤 ,并通过建立动态规划数学模型解决了求最短路径问题 ,具有广泛的实际意义     

基于知识协同的企业生产信息融合方法研究

作为企业经营管理决策者进行决策的依据,有价值信息获取的关键在于生产信息融合网络链上相关节点随市场目标变化而动态地组织信息融合模式,以及建立在该网络链之上的关键节点的工作协同流程。知识点是信息协同关键链的基本节点,在生产信息网络组建时可以按照市场的协同需求调用合适的知识点作为节点单元以构成生产信息工作流关键链,也可以结合企业特点变更需求以对个别节点进行调节。知识节点是信息融合的协同处理单元。层面智能元(信息的可视、触摸、嗅、听、闻、受力等层)是组成知识节点的基本单位,构成知识节点的内涵,经过信息融合(加工)形成知识节点的外延,节点间通过外延的握手融合构成信息协同融合链群。