Ad Hoc网络中基于捕食逃逸PSO的QoS多播路由算法

求解两个或多个限制参数的QoS多播路由问题,已被证明为NP-complete问题,而随着Ad hoc网络中多媒体和实时应用需求的不断提升,有效的QoS多播路由算法成为重要研究内容.针对Ad hoc网络的动态性和QoS参数的多样性,给出一种解决该问题的捕食逃逸PSO方法,算法通过对MAODV路由发现过程发现的QoS有效路径进行编码和寻优处理,借助于捕食逃逸行为使算法能够以较大概率获取全局最优QoS多播路由.在NS2平台上的仿真结果表明了捕食逃选PSO解决Ad hoc网络QoS多播路由问题的可胜任性.     

基于16位单片机的智能循线和避障机器人设计

本文介绍了一种具有智能循线和避障功能的机器人设计方案,机器人系统包括控制系统的硬件和软件设计。硬件部分主要包括控制器、传感器和电机控制电路,控制器采用16位单片机SPCE061A,循线和避障机器人的驱动采用直流电机驱动,使用红外传感器检测轨迹线和障碍物,实现了机器人的自动控制和语音控制的结合。     

钻井柴油机烟气热管锅炉应用分析

针对油田钻井柴油机耗能大．有相当部分的热能被柴油机排出的烟气带走而浪费的缺陷．对钻井柴油机烟气可利用余热进行分析,结合实际分析利用余热设计热管锅炉。代替燃煤锅炉为井队冬天钻井供热取暖,以节约能源．降低钻井成本．具有很强的实用价值。     

利用轮胎痕迹宽度判断肇事车型的研究

利用交通事故现场遗留的各种痕迹可以有效帮助侦破事故逃逸案件.发生交通事故时,事故现场一般会留下肇事车辆的轮胎痕迹.在不同胎压和负载工况下对几种车型进行了实路实验,测量了各种条件下的轮胎实际接地痕迹宽度,并进行了去畸及均化处理,最后利用加权综合评判的方法求解出轮胎痕迹接地宽度的特征值.将它与现场的肇事车辆轮胎痕迹宽度进行比对,可以帮助快速判断肇事车辆的类型.     

QFZ—22轻便防突钻机的应用

介绍QFZ— 2 2型轻便防突钻机首次在峰峰矿务局的推广应用情况 ,并进行了经济效益分析     

Strategy planning in cats (Felis catus) in a progressive elimination task.

Domestic cats (Felis catus) were administered a progressive elimination task in which they had to visit and deplete 3 baited sites. Cats were brought back to the starting point after each visit to any site whether the visit represented a correct or an incorrect choice. The results revealed that cats organized search as a function of the least distance principle whether they had to assess starting point to target distances (Experiment 1, n=12) or adjacent bowl distances (Experiment 2, n=12). The results also revealed that the starting point to target distance factor was the most influential in determining the initial choice (Experiment 3, n=6) and in producing errors. Errors were also linked to the antero-posterior bodily axis of the cat. Results are discussed in terms of the predatory behavior of the cat. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Modified electromagnetism-like algorithm and its application to slope stability analysis

In the view of the disadvantages of complex method (CM) and electromagnetism-like algorithm (EM), complex electromagnetism-like hybrid algorithm (CEM) was proposed by embedding complex method into electromagnetism-like algorithm as local optimization algorithm. CEM was adopted to search the minimum safety factor in slope stability analysis and the results show that CEM holds advantages over EM and CM. It combines the merits of two and is more stable and efficient. For further improvement, two CEM hybrid algorithms based on predatory search (PS) strategies were proposed, both of which consist of modified algorithms and the search area of which is dynamically adjusted by changing restriction. The CEM-PS1 adopts theoretical framework of original predatory search strategy. The CEM-PS2 employs the idea of area-restricted search learned from predatory search strategy, but the algorithm structure is simpler. Both the CEM-PS1 and CEM-PS2 have been demonstrated more effective and efficient than the others. As for complex method which locates in hybrid algorithm, the optimization can be achieved at a convergence precision of 1×10⁻³, which is recommended to use.     

仿灰狼合作捕食行为的无人机集群动态任务分配

大规模无人机集群可以承担单个无人机无法完成的复杂任务, 为提高无人机集群执行任务的成功率与可 靠性, 综合考虑资源均衡与多目标分配的任务规划必不可少. 灰狼是一种典型的团队合作狩猎动物, 在捕食过程中 体现出明显的社会层级结构与合作捕食行为. 通过分析灰狼群体的狩猎过程, 对灰狼的群体交互机制与合作捕食行 为建模; 在此基础上, 将灰狼合作捕食行为机制映射至无人机集群动态任务分配中, 给出了无人机集群动态任务分 配流程. 仿真结果表明, 当无人机集群数量与任务节点关系不同时, 所提无人机集群动态任务分配方法在资源均衡 度与有效性方面均有明显优势.     

高强钢焊接接头扩散氢行为研究

针对900 MPa钢级高强钢,采用甘油法测试焊接接头中扩散氢含量,并研究焊后放置72 h内扩散氢的逸出规律.研究结果表明,试板装瓶后0.5～12 h时,扩散氢的逸出速度很快,逸出量比较大,可以达到总逸出量的90％;在12～24 h这一时间区间内,扩散氢逸出速度变慢;在24～72 h时间内,扩散氢逸出量基本维持不变.由此看出,在焊接后24 h内,熔敷金属中的扩散氢已经逸出怠尽.本研究结果也表明对高强钢焊接结构进行消氢处理时必须在焊后尽快进行,否则消氢处理的意义不大.     

基于激光双吸收谱线的氨气温度测量研究

选择性催化还原(SCR)是燃煤发电中降低NOx排放使用最多的技术,化学还原反应中氨气(NH3)温度是闭环控制SCR过程的关键参数之一。提出了一种基于激光双吸收谱线的氨气温度测量方法,实现SCR过程化学反应温度实时监测。利用HITRAN08数据库,选取一对氨气的吸收谱线6605.1042 cm-1和6605.1901 cm-1,理论推导了两条吸收谱线的强度比与温度的关系。实验结果显示,在80～160 ℃温度范围内,温度测量的线性误差为0.89%(平均值),最大波动为3.5%,为下一步高温测量氨气浓度和温度测量奠定了基础。