标志树文法及其语法分析

树文法是一种高维文法，能够用来表达二维以上复杂对象的构造规则．在模式识别、图式语言等领域有着广泛的应用前景．本文在树文法有关概念基础上提出了标志树、连接标志、标志树文法等概念，构造了标志树的匹配和识别算法，并成功解决了标志树文法的语法分析器构造问题．     

β-PP/PA 6合金的结晶与熔融行为

为了研究β-成核剂在合金中分散对聚丙烯（PP）成核效率的影响,采用2种方法制备了负载型β-成核剂成核PP（β-PP）／聚酰胺6（PA6）合金。用差示扫描量热仪和广角X射线衍射仪研究了不同制备方法及熔融温度对β-PP／PA6合金的结晶行为、熔融特性和β-PP含量的影响。结果表明：PP,PA6先熔融再降温至／90℃加入成核剂制备β-PP,PA6合金的β-PP含量高于先制备β-PP再与PA6混炼制备的合金。熔融温度高有利于β-PP／PA6合金中PP形成β-PP。     

含短纤维胎面胶的混炼工艺

介绍了含短纤维胎面胶的混炼工艺,分析了在混炼过程中短纤维在橡胶中的混合分散模型.指出当短纤维-橡胶复合材料处于最佳黏度状态时,混炼效果最佳.     

基于自动检焦信号梯度信息的自适应平滑算法研究

近年来随着航空相机技术不断发展,高分辨率相机将成为未来航空相机的发展趋势;但环境的变化会使光学系统的性能发生显著的、随机的变化,因此,欲在恶劣的环境条件下获得最佳分辨率,必须使相机具有很高的检焦精度,然而由于测量元件及电源等的噪声的存在,大大影响了检焦信号精度;基于中值滤波和梯度信息的平滑滤波算法,介绍了一种新的自适应平滑算法,该算法有效地抑制扰动信号,更为真实的突现出峰值信号,从而大大提高了检焦精度;该方法大大减小了随机干扰对检焦结果的影响,提高了检焦精度,从而每次都能获得较为清晰的图像。     

Design of Networked Control Systems With Packet Dropouts

This note is concerned with stability and controller design of networked control systems (NCSs) with packet dropouts. New NCS models are provided considering both single- and multiple-packet transmissions. Both sensor-to-controller (S/C) and controller-to-actuator (C/A) packet dropouts are modeled and their history behavior is described by different independent Markov chains. In term of the given models, sufficient conditions for stochastic stability are derived in the form of linear matrix inequalities (LMIs) and corresponding control laws are given. Numerical examples illustrate the effectiveness of the results.     

基于DSP的视频监控系统的优化仿真设计

设计了基于TMS320C6205DSP的MPEG-4数字视频监控系统,针对软硬件特性对优化方法做了详细阐述并完成了对该系统的仿真优化,最后给出了关键的测试结果。     

信管专业中“C语言”与“数据结构”课程的整合研究

本文通过分析信管专业学生在学习＂C语言＂与＂数据结构＂过程中存在的问题,提出了将两门课程进行整合的教学模式。     

三角网格表面等残留高度刀轨生成算法

针对截平面法规划的三角网格表面的刀轨长度较长、加工表面残留高度不均匀的问题,提出一种基于改进截平面法的等残留高度刀轨生成算法.首先在估算刀触点轨迹线垂直方向曲率半径的基础上,计算刀触点轨迹投影线并对其进行修正,去除其中冗余的投影点;然后由修正后的刀触点轨迹投影线构造驱动表面,利用驱动表面和网格表面迭代计算刀触点轨迹线;最后由刀触点轨迹线计算无干涉刀轨.与截平面法生成的刀轨进行比较分析的结果表明,文中算法生成的刀轨长度较小且获得的残留高度保持均匀,适合于三角网格表面表示的复杂表面的精加工.     

一种新的基于分层分组式结构的组播密钥管理方案

分析了常见的几种分层分布式密钥管理方案,并且在前人的基础上提出了一种新的基于分层分布式结构的组播密钥管理构想,介绍了这种方案的基本思想。通过实验分析比较了这种方案与前人方案的不同点及相同点,以及各自的优缺点。     

Ex-post efficient resource allocation for Self-organizing Cloud

Self-organizing Cloud is a scalable model to provide powerful computability with distributed computers. The resource allocation on it is very challenging since it not only involves various types of divisible resources but needs to cope with social competitions. We propose a novel resource allocation scheme with three features on ex-post efficiency. (1) Ex-post win–win effect: each participant (consumers and suppliers) should always feel satisfied with their ex-post payoffs. (2) Incentive compatibility: we can prove each rational participant gets its optimal payoff iff their resource demands and expected prices are truthfully declared. (3) Ex-post maximized efficiency: more powerful resources should be consumed with higher likelihood, such that the whole system runs quite efficiently with maximized resource utilization. Our simulation shows the approach significantly improves resource suppliers’ incomes by 20% compared to their expectations. Meanwhile, we can guarantee consumers’ payments below their budgets, with no any degradation of task execution performance.