无线自组织网络跨层攻击检测博弈模型

无线自组织网络中的跨层攻击具有比单层攻击更强的隐蔽性、更好的攻击效果或更低的攻击成本.为了检测无线自组织网络中的跨层攻击,提出了一种基于博弈论的攻击检测模型.由于攻击不可避免地会对各协议层的参数造成影响,因此模型从协议层攻防博弈的角度,建立起相应的策略矩阵和支付矩阵,并通过均衡分析得到该模型的混合策略纳什均衡解.仿真结...     

A novel launch dynamics measurement system for multiple launch rocket system and comparative analysis with numerical simulations

In this paper,a novel launch dynamics measurement system based on the photoelectric sensor pair is built.The actual muzzle time(i.e.a time duration that originates from the initial movement to the rocket's departure from the muzzle)and the muzzle velocity are measured.Compared with the classical methods,the actual muzzle time is obtained by eliminating the ignition delay.The comparative analysis method is proposed with numerical simulations established by the transfer matrix method for multibody systems.The experiment results indicate that the proposed measurement system can effectively measure the actual muzzle time and reduce the error of classical methods,which match well with the simulation results showing the launch dynamics model is reliable and helpful for further analysis and design of the MLRS.     

Disruption management in production planning

We study the problem of recovering a production plan after a disruption, where the disruption may be caused by incidents such as power failure, market change, machine breakdown, supply shortage, worker no‐show, and others. The new recovery plan we seek after has to not only suit the changed environment brought about by the disruption, but also be close to the initial plan so as not to cause too much customer unsatisfaction or inconvenience for current‐stage and downstream operations. For the general‐cost case, we propose a dynamic programming method for the problem. For the convex‐cost case, a general problem which involves both cost and demand disruptions can be solved by considering the cost disruption first and then the demand disruption. We find that a pure demand disruption is easy to handle; and for a pure cost disruption, we propose a greedy method which is provably efficient. Our computational studies also reveal insights that will be helpful to managing disruptions in production planning. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2005.     

基于调制/解调的动态响应测试方法

在磁悬浮列车中,悬浮控制系统要求间隙传感器的动态特性,但无法用机械方法测试较高频率时的动态特性。根据传感器工作机制,用模拟涡流场来代替被测导体的涡流效应,提出基于调制/解调原理的动态特性测试方法,并分别对正弦信号和方波信号的测试方法进行了探讨。最后给出了两种特征信号的传感器动态特性测试结果。实验表明,这种方法能够满足测试要求,相对于机械方法有很大的优越性。     

An approximate planning model for distributed computing networks

We develop an approximate planning model for a distributed computing network in which a control system oversees the assignment of information flows and tasks to a pool of shared computers, and describe several optimization applications using the model. We assume that the computers are multithreaded, and have differing architectures leading to varying and inconsistent processing rates. The model is based on a discrete‐time, continuous flow model developed by Graves [Oper Res 34 (1986), 522–533] which provides the steady‐state moments of production and work‐in‐queue quantities. We make several extensions to Graves' model to represent distributed computing networks. First, we approximately model control rules that are nonlinear functions of the work‐in‐queue at multiple stations through a linearization approach. Second, we introduce an additional noise term on production and show its use in modeling the discretization of jobs. Third, we model groups of heterogeneous computers as aggregate, “virtual computing cells” that process multiple tasks simultaneously, using a judiciously selected control rule. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2005.     

光纤光栅压力传感器封装增敏技术

介绍了封装对光纤光栅纤内谐振腔的光学特性的影响、基于压力增敏的光纤光栅封装的物理机制及其研究进展,综述了解决应变和温度交叉敏感问题的方法,提出了一种基于压力传感增敏效果好的多层封装结构,同时还利用2种聚合物不同的力学特性,设计了一种解决应变和温度交叉敏感的封装方法,讨论了封装材料对增敏效果的影响.     

高抗噪无线车内语音通信系统的研究

由于现行的车内通话器均采用有线连接和传统的降噪方式,导致了乘员活动范围受限以及降噪能力不强等问题.提出了一套综合应用蓝牙技术和骨传导技术的无线语音通信系统,并将其应用到装甲车辆上,最后提出了一些在实际设计中需要解决的问题,为今后进一步研究提供参考.     

基于FNNs的闭式循环柴油机配氧前馈控制策略研究

配氧控制是闭式循环柴油机(CCD)系统的关键技术之一,为改善其动态特性,在 PID反馈控制的基础上,设计了基于模糊神经网络(FNNs)模型的前馈控制器,并采用 PID反馈控制输出信号作为网络训练的误差信号,使模糊神经网络逐步具有前馈补偿能力,从而能够有效对负荷扰动进行及时补偿.仿真结果表明,采用FNNs前馈控制器后,可以有效改善氧气控制的动态特性,并且具有快速的学习速度和很强的适应能力.     

长向量处理器高效RNN推理方法

模型深度的不断增加和处理序列长度的不一致对循环神经网络在不同处理器上的性能优化提出巨大挑战。针对自主研制的长向量处理器FT-M7032,实现了一个高效的循环神经网络加速引擎。该引擎采用行优先矩阵向量乘算法和数据感知的多核并行方式,提高矩阵向量乘的计算效率;采用两级内核融合优化方法降低临时数据传输的开销;采用手写汇编优化多种算子,进一步挖掘长向量处理器的性能潜力。实验表明,长向量处理器循环神经网络推理引擎可获得较高性能,相较于多核ARM CPU以及Intel Golden CPU,类循环神经网络模型长短记忆网络可获得最高62.68倍和3.12倍的性能加速。     

一种面向节点定位的移动信标动态路径规划方法

针对基于移动信标的传感器节点定位问题,提出一种基于在线决策的移动信标动态路径规划方法.针对以往算法大都只适用于节点均匀分布的局限,该方法用移动信标不断获取两跳范围内的未定位节点数目,并向最大覆盖未定位节点方向移动,不需要网络先验信息,即可实现路径的优化.仿真结果表明:与传统方法相比,该方法无需网络的先验信息,在移动路径长度上具有明显优越性,减少了信标的能量消耗,更适用于户外部署的大规模传感器网络.