Elastic Anisotropic Material with Purely Longitudinal and Transverse Waves

The simplest form of the matrix of elasticity moduli of an anisotropic material conducting purely longitudinal and transverse waves with an arbitrary direction of the wave normal is obtained. A generic solution of equations in displacements is represented in terms of three functions satisfying independent wave equations. In the case of planar deformation, this solution yields a complex representation coinciding with the Kolosov–Muskhelishvili formulas for an isotropic material. The formulas in the present work also determine an anisotropic material with Young's modulus identical for all directions, as in an isotropic medium.     

一种抽象泛型机制的新型Java实现

泛型程序设计可大幅度提高程序的可重用性、可靠性和开发效率,高抽象的泛型机制则有助于降低泛型编程的复杂度.该文介绍了一种抽象泛型机制的核心思想和编程技术,分析了新型Java中与之对应的实现机理,并归纳出相应的转换规则,且在既有平台中实现了抽象泛型程序到新型Java泛型程序的自动转换和运行,最后通过一个Kleen算法实例,展示了抽象泛型机制的实际运用和相应Java程序的自动生成.抽象泛型机制的新型Java实现,在降低可重用算法构件的设计复杂度、提高算法构件可靠性的同时,也为泛型构件的设计和描述提供了行之有效的新途径.     

FAULT DIAGNOSIS OF ROTATING MACHINERY USING KNOWLEDGE-BASED FUZZY NEURAL NETWORK

A novel knowledge-based fuzzy neural network (KBFNN) for fault diagnosis is presented.Crude rules were extracted and the corresponding dependent factors and antecedent coverage factors were calculated firstly from the diagnostic sample based on rough sets theory.Then the number of rules was used to construct partially the structure of a fuzzy neural network and those factors were implemented as initial weights,with fuzzy output parameters being optimized by genetic algorithm.Such fuzzy neural network was called KBFNN.This KBFNN was utilized to identify typical faults of rotating machinery. Diagnostic results show that it has those merits of shorter training time and higher right diagnostic level compared to general fuzzy neural networks.     

遗传算法中的逐级进化策略研究

基于反馈控制原理,通过对遗传算法寻优规律的分析,提出了一种逐级进化策略．计算结果表明,该方法可有效地改善遗传算法的寻优性能．     

对化学反应数据分类获取反应知识的新方法

尽管已有大量化学反应数据可供使用,但化学家仍常常感到很难便捷地从中得到所需的信息.这主要是由于反应数据库基于结构的检索方法与化学家解决问题的方法相去甚远.为解决这一问题而发展了一种通过对反应进行二级分类得到精细描述反应知识的层次模型的方法.第一次分类时不同的同类反应都在由一组普适性好的称作反应结构一级描述符构成的空间中进行.在第一次分类结果的基础上,得到每一类反应的公共结构特征作为第二次分类的结构描述符,利用它们进行更精细的分类,即可从原始反应数据中得到所需的基核反应.由特定反应、基核反应和基型反应就可将反应知识更合理地组织在同类反应知识库中,使它们得到更好的利用.     

基于语义的网格服务组合研究

随着网格技术的发展,以及网格中资源的不断增加,网格服务组合具有非常重要的意义。针对网格服务的动态性和分布性,提出了一种基于语义P2P的网格服务组织方式,并提出了将基于情景演算方法中的通用程序转化为HTN领域模板,通过加入用户偏好对SHOP2规划算法进行了改进,减小了规划空间,提高了规划效率。