Consistency property of extended least-squares parameter estimation for stochastic diffusion equation

The extended least-squares parameter estimate for stochastic heat diffusion equations is considered. The unknown parameter is a heat diffusion coefficient which is a function of a spatial variable. Almost sure convergence for the estimated parameter is proved. A numerical example is demonstrated for supporting the theoretical results developed here.     

可持续发展与环境保护对策

可持续发展战略已被纳入我国“九五”计划和２０１０年的中长期国民经济和社会发展计划，而保护环境是可持续发展战略最主要的前提和保障。本文介绍了世界环境问题出现的历史、可持续发展的提出及内涵，概述了发展与环境的辩证关系，结合我国可持续发展面临的严峻环境保护形势，提出环境保护的对策。     

语音合成库的建立与汉语数码语音识别途径

利用语音合成芯片 TC8830 AF的 CPU控制方式下的 DMA功能 ,主控微机可共享语音数据存储器 SRAM资源 ,对语音数据直接操作 ,实现语音数据的快速处理 ,对语音合成库的建设机理进行了深入探讨 ,并提出了一种实用的汉语数码语音识别方法 .实践结果表明本系统适用于语音合成产品的开发     

最大权-最大基数分配问题算法

本文对经典的分配问题，根据实际需要提出了一个新的应用模型，给出了其实现算法及相关证明．     

String-matching with OBDDs

Ordered binary decision diagrams (OBDDs) are a very popular graph representation for Boolean functions. They can be viewed as finite automata recognizing sets of strings of a fixed length, where the letters of the input strings are read at most once in a predefined ordering. The string matching problem with string w as pattern, consists of determining, given an input string, whether or not it contains w as substring. We show that for a fraction of orderings tending to 1 when n increases arbitrarily, the minimal size of an OBDD solving the string matching problem for strings of length n has a growth which is an exponential in n.     

Modelling and FDI of Dynamic Discrete Time Systems Using a MLP with a New Sigmoidal Activation Function

In this paper we investigate the use of the multi-layer perceptron (MLP) for system modelling. A new sigmoidal activation function is introduced and the study is focused at the utilization of this function on a MLP that performs modelling of dynamic, discrete time systems. The role of the activation function in the training process is investigated analytically, and it is proven that the shape of the activation function and it's derivative can affect the training outcome. The method is simulated at a well known benchmark, namely the three tank system, and is incorporated in a Fault Detection and Identification (FDI) method, also applied and simulated at the three tank system. Finally, a comparison is made with an approach that utilizes local model neural networks for system modeling.     

可对称化不定非线性问题的不精确Newton法

本文讨论了处理可对称化不定问题的不精确Newton方法,并针对问题的特殊结构提出了不精确Newton-PSMINRES算法。理论分析与数值试验表明,Newton-PSMINRES算法优于其它处理可对称化不定问题的不精确Newton-Krylov算法。     

浅谈SWA-FC名牌产品的发展战略

阐述了创名牌对西南铝发展的重要性，提出了西南铝SWA-FC产品创全国名牌的战略途径。     

A finite element formulation to identify damage fields: the equilibrium gap method

It is proposed to determine damage parameters in two dimensions (surface of a material) or three dimensions (in the bulk of a solid) by using full‐field displacement measurements. A finite‐element approach is developed to evaluate piece‐wise constant elastic parameters modeled by an isotropic damage variable. Two sets of examples are discussed. The first series deals with mechanical fields obtained by finite element simulations to assess the performance of the approach. The second series is concerned with displacement measurements performed during a biaxial test on a composite material. Copyright © 2004 John Wiley & Sons, Ltd.     

普通钢筋混凝土结构设计中应注意的若干问题

简要介绍了普通钢筋混凝土结构设计中结构计算模型的建立、梁板计算模式的确定以及计算参数的取值等几方面应注意的问题，提出了相应的处理方法和要求。