基于辐射能量分析的网络拓扑结构探测

在战场环境中,探测出敌方网络拓扑结构,为寻找网络最佳攻击点奠定了基础,具有重要意义。在研究数据链组网原理的基础上,研究了多址接入方式的探测方法,并提出了基于辐射能量分析的网络拓扑结构探测新方法。该方法通过对信号进行时频分析并结合互联关系矩阵来进行网络拓扑结构判断,仿真结果表明该方法可以有效地判断出敌方的网络拓扑结构和多址接入方式。     

Bicriteria scheduling on a single batching machine with job transportation and deterioration considerations

We study a single batching machine scheduling problem with transportation and deterioration considerations arising from steel production. A set of jobs are transported, one at a time, by a vehicle from a holding area to the single batching machine. The machine can process several jobs simultaneously as a batch. The processing time of a job will increase if the duration from the time leaving the holding area to the start of its processing exceeds a given threshold. The time needed to process a batch is the longest of the job processing times in the batch. The problem is to determine the job sequence for transportation and the job batching for processing so as to minimize the makespan and the number of batches. We study four variations (P1, P2, P3, P4) of the problem with different treatments of the two criteria. We prove that all the four variations are strongly NP‐hard and further develop polynomial time algorithms for their special cases. For each of the first three variations, we propose a heuristic algorithm and analyze its worst‐case performance. For P4, which is to find the Pareto frontier, we provide a heuristic algorithm and an exact algorithm based on branch and bound. Computational experiments show that all the heuristic algorithms perform well on randomly generated problem instances, and the exact algorithm for P4 can obtain Pareto optimal schedules for small‐scale instances. © 2014 Wiley Periodicals, Inc. Naval Research Logistics 61: 269–285, 2014     

振动遗传算法在无人机三维航路规划的算法研究

针对代价函数权重需要根据环境变化而变化的问题,结合飞行约束条件提出归一化的代价函数,当环境发生变化时,不用再修改代价函数,增强了算法的鲁棒性。为了弥补传统定步长寻径算法耗时长的缺陷,设计了一种基于B样条曲线与遗传算法的高时效寻径算法。利用遗传算法在地图中所寻合适的控制点,再结合B样条曲线生成航路。为了增强遗传算法的全局搜索能力,遗传算法中加入振动法则,使得种群在进化中后期依旧保持一定的多样性。仿真结果表明该算法与精英蚁群算法相比,规划时间大幅缩短;与振动遗传算法相比,航路代价明显降低。     

武器装备需求分析方法

针对当前武器装备需求分析中存在的流程不规范和方法不明确等问题,基于体系结构框架思想,提出了武器装备需求分析方法,构建了武器装备需求分析框架,规范了武器装备需求分析流程,研究了武器装备需求分析的不同环节及其方法,并以陆航武装直升机编队遂行超低空“蛙跳”式对地火力攻击为例,验证了基于体系结构框架的武器装备需求分析方法的科学性和可用性.     

我党关于武警部队建设指导理论的创新发展

中国人民武装警察部队是党和国家武装力量的重要组成部分.我党十分重视武警部队的建设和发展.在不同历史时期,党的领导人根据形势和任务变化需要,先后提出了一系列重要指导思想,指导武警部队不断发展壮大;武警部队有效履行了党和国家赋予的历史使命,出色完成了各项光荣而艰巨的任务.     

Influences of different crossing types on dynamic response of underground cavern subjected to ground shock

An intersecting cavern is a common structural form used in underground engineering, and its safety and stability performance directly control the service performance of the whole project. The dynamic re-sponses of the three kinds of crossing type (+-shaped, T-shaped, L-shaped) caverns subjected to ground shock were studied by numerical simulation. The velocity plus force mode boundary setting method was proposed in the coupled static and dynamic analysis of a deep underground cavern. The results show that, among the three types of crossing caverns, the+-shaped cavern is the most significantly affected by the dynamic action, followed by T-shaped, and then L-shaped caverns. The vault settlement, straight wall deformation, vault peak particle velocity, effective plastic strain of surrounding rock, and maximum principal stress and strain at the bottom of the lining of the straight wall increase with the increase of cavern span. The vault settlement, straight wall deformation, effective plastic strain of surrounding rock, and the maximum principal stress and strain at the bottom of lining to the straight wall decrease with the increase of lateral pressure coefficient, and the peak particle velocity at the vault increases. The variation is small compared with the change of cavern span. The influence range of the underground cavern intersection is two cavern diameters from the intersection centre. The bottom of the straight wall at the intersection is the weak part. It is suggested to thicken the support locally to improve the stability of the cavern.     

农学专业教学生产实习问题探讨

农学专业是一门实践性非常强的专业,其中教学生产实习是专业教育过程中极为重要的环节,其成败直接影响农学专业学生的综合能力和水平。经过多年指导农学专业教学生产实习的实践,现就农学专业教学生产实习的特点和在新时期下存在的主要问题进行分析,并提出相应的改革措施。     

回归型支持向量机的机翼结冰冰型预测

飞机结冰严重威胁着飞行安全。针对机翼结冰冰型预测时不确定性因素较多、难以准确预测的问题,提出了一种基于回归型支持向量机的机翼结冰冰型预测方法。在建立冰型模型的基础上,利用回归型支持向量机(Support Vector Regression,SVR)获得冰型多项式系数,从而预测出相关飞行条件和大气条件下的冰型。仿真结果表明,该方法具有较好的预测能力,可以及时提供可靠的结冰信息,为保证结冰条件下的飞行安全提供了保障。     

CEC条件下的舰艇编队防空问题

未来战争是"海、陆、空、电、天"五位一体的高技术战争,机动战、火力战和信息战将贯穿于作战的全过程.面对这样一种局面,传统的水面舰艇编队防空作战样式必将发生重大变革以适应未来海战的需要.美国海军针对上述情况研究了协同作战能力(CEC),并将其推广应用于各种指挥系统.CEC已经成为一种提高指挥系统协同作战能力的重要技术,通过使每个独立平台成为战斗群的延伸来弥补单个平台的弱点.借鉴了网络中心战的思想并结合美军提出的CEC,分析了CEC条件下的我水面舰艇编队的防空问题.