Samples Selection for Artificial Neural Network Training in Preliminary Structural Design

An artificial neural network (ANN) is applied in the preliminary structural design of reticulated shells. Major efforts are made to enhance the generalization ability of networks through well-selected training samples. Number-theoretic methods (NTMs) are adopted to generate samples with low discrepancy, i.e.uniformly scattered in the domain, where discrepancy is a quantitative measurement of the uniformity. The discrepancy of the NTM-based sample set is 1/6-1/7 that of samples with equal spacing. In a case study,networks trained by NTM-based samples are compared with those trained by equal-spaced samples in generalizing performance. The results show that both the computational precision and stability of the former ANNs are more satisfactory than those of the latter. It is concluded that the flexibility of ANNs in generalizing can be effectively increased by use of uniformly distributed training samples rather than simply piling data.More reliable uniformity should be obtained, however, through NTMs instead of equal-spaced samples.     

文化式原型变化之比较

从立体构成形式、基本松量、胸省量、肩斜角、前后高度差、袖斜角、省道变化应用等方面，对新老版本文化式原型进行了对比分析。论证了新版文化式原型的科学性、合理性和实用性。     

论铁凝对女性模仿性生存的女性叙事

铁凝一直自我定位于“第三性”写作,可是读罢她的大多数小说之后,却发现了她不同的小说中存在着一个共同的女性生存模式——模仿。这种模仿与生存处境的弱势有关,模仿中的焦虑与性别弱势有关。铁凝的“第三性”声明是作家刻意的性别遮蔽。     

Forecasting recessions using the yield curve

We compare forecasts of recessions using four different specifications of the probit model: a time invariant conditionally independent version; a business cycle specific conditionally independent model; a time invariant probit with autocorrelated errors; and a business cycle specific probit with autocorrelated errors. The more sophisticated versions of the model take into account some of the potential underlying causes of the documented predictive instability of the yield curve. We find strong evidence in favour of the more sophisticated specification, which allows for multiple breakpoints across business cycles and autocorrelation. We also develop a new approach to the construction of real time forecasting of recession probabilities. Copyright © 2005 John Wiley & Sons, Ltd.     

统计模式识别的研究

模式识别的基本目标就是在有监督和无监督的情况下进行分类,在模式识别的各种模型中,基于统计的方法已经被广泛的研究并应用于实际.一些新的技术和方法的引入（神经网络和支持向量机方法）也促进了该领域发展,文章研究了基于统计的模式识别的进展情况,给出了模式识别的概念、原理、方法并对各种方法进行了相关的评述.     

膜结构裁剪及展开的修正二次测地线法

对膜结构裁剪分析中目前应用较广的裁剪线的生成方法进行了比较研究，提出修正二次测地线法。确定了采用测地线作为裁剪线及展开图形的基准线。之后对已有图形展开方法——二次测地线法做了适当改进，提出修正二次测地线法。     

一类排列的计数问题

应用容斥原理解决了不含连续数对的一系列排列的计数问题。并将其进行了推广。     

英语专业师范生语音模式规范化的必要性

语音是学任何一门语言的基础。语音的规范化直接影响学习者语言的学习效果，因此对英语专业师范生的语音模式要进行严格规范。     

命令模式应用探讨

通过一个具体实例的代码重构与几个模式的运用的密切配合，较好地解决了软件系统中的可复用性，可维护性问题。这种基于设计模式的软件构造方法，经作者实际应用证明是可行的和有效的。     

论教育实习指导教师的专业化发展--兼谈美国PDS模式的启示

从分析我国教育实习中指导教师指导素质不高的现状及形成原因出发,借鉴美国PDS模式中教师职前培养的成功经验,探讨我国教育实习指导教师专业化发展的途径,以提高教育实习指导质量.