非线性矩阵方程X-A*((X)-C)-n A=Q的正定解

研究了非线性矩阵方程X-A*((X)-C)-n A=Q的正定解,证明了该方程一定存在正定解,并给出了正定解的存在区间、存在唯一正定解的条件以及迭代求解方法.     

一个数值积分公式的推广

利用奇函数和偶函数的积分性质,以及泰勒公式,对于定义在区间[a,b]上的函数f（x）的积分I=a^bf（x）dx,给出了一个更高精度的数值积分公式,推广和改进了文献[1]中已有的结论．     

对体操运动价值的探讨

体操是体育的一个重要组成部分,在我国有着悠久的历史.它的内容丰富.形式多样.易于普及.对青少年的成长发育、人的形体美及强自健体具重要的运动价值.     

织物风格测试的因子分析

利用因子分析的方法，对２５块精纺毛织物的ＫＥＳ－ＦＢ测试结果进行了分析并对简化织物风格测试指标的结构体系进行了探讨。     

正定矩阵半群

以Pn(R)表示所有n×n实正定矩阵的集合 ,用Pn(A)表示使得AB+BA正定的n×n实矩阵B的全体 .对正定矩阵A证明了Pn(A)是Pn(R)的子半群 ,作为半群二者同构     

Chinese Basic Block—The Structure Designing Principle and Technology of Dong Hua Basic Block

The principles and the interrelated factors of the basic garment pattern are discussed. Furthermore the regression relation between the different parts of the Chinese female bodies and the application rules of the box pattern are analyzed. Chinese basic block- the DongHua Basic Block is founded theoretically and practically.     

论新闻价值主要因素的构成

新闻价值是新闻工作者衡量事实可否成为新闻的标准,是事实本身所具有的能够构成新闻因素的综合。它具有满足人们及时了解外界新情况需求的功能。新闻价值是由真实性、导向性、政治性、显著性、时间性、新鲜性、知识性、趣味性等方面因素构成的。     

基于神经网络的手写体数字识别

本文将奇异值分解方法用于神经网络结构优化。通过收敛后网络的权值矩阵作ＳＶＤ分解，根据分解结果确定出较适宜的隐层神经元数目，这样神经网络结构得以简单化，连接权的数目将减少，从而使计算理减少，节约存贮资源及时间。     

Quality/value relationships for imperfect weather forecasts in a prototype multistage decision-making model

Some theoretical results concerning the nature of the relationship between the scientific quality and economic value of imperfect weather forecasts are obtained. A prototype multistage decision-making model is considered, involving only two possible actions and two possible states of weather. This particular form of model is motivated by a real-world application known as the fruit-frost problem. For an infinite-horizon, discounted version of this model it is shown that economic value remains zero below a forecast quality threshold and then rises monotonically but nonlinearly above this threshold. In particular, the relative sensitivity of economic value to changes in the quality of forecasts increases as perfect information is approached. This curve is compared with quality/value relationships that have been obtained for other versions of the model; namely, a single-stage model and a multistage, finite-horizon model.