现代远程教育的现状及利与弊

本文阐述了国内外现代远程教育的现状，深入分析了其利弊，最后提出了克服弊端的对策。     

车床大修后三杆不同心的治理

车床大个舶 ，经常会碰到三杆不同心现象。本文提出了如何解决这个问题的综合治理的方法。     

雷达目标一维距离像识别中的修正正则子空间法

涌现在复杂性理论中占有重要的地位.本文在讨论涌现的基本概念的基础上,介绍了一种用于研究复杂系统涌现行为的模型方法-CGP模型,给出了一个CGP模型的具体例子--采集机器人的仿真模型.通过对这个模型进行仿真实验,观察到机器人简单的状态转换函数和看似杂乱无章的行为产生了具有明显规律性的结果,对这种涌现现象的产生进行了分析,指出了它的现实意义.     

论珠三角至盐田港之间开发铁路集装箱运输的可行性

铁路运输具有距离与规模两方面的经济性，铁路部门也一直把大批量中长途货物运输作为其目标市场。但运输需求的生成是递远递减的，因此探讨铁路短距离大规模运输产品策略就很有意义了。本文从理论上论述铁路短途运输方案可行的基本条件，并具体讨论珠江三角地区与盐田港之间开发集装箱运输产品的可行性。     

Consensus phylogeny ofDictyostelium

The evolutionary relationship ofDictyostelium discoideum to the yeasts, fungi, plants, and animals is considered on the basis of physiological, morphological and molecular characteristics. Previous analyses of five proteins indicated thatDictyostelium diverged after the yeasts but before the metazoan radiation. However, analyses of the small ribosomal subunit RNA indicated divergence prior to the yeasts. We have extended the molecular phylogenetic analyses to six more proteins and find consistent evidence for a more recent common ancestor with metazoans than yeast. A consensus phylogeny generated from these new results by both distance matrix and parsimony analyses establishesDictyostelum's place in evolution between the yeastsSaccharomyces cerevisiae andSchizzosaccharomyces pombe and the wormCaenorhabditis elegans.     

基于距离相关性的乳腺癌通路串扰研究

乳腺癌(Breast Cancer, BC)作为女性最常见的恶性肿瘤迄今为止起因尚不明确,近年来针对单个基因或单条信号通路(pathway)的研究难以分析疾病的复杂发病机理。考虑到信号传导通路之间普遍存在相互关联和相互串扰的分子生物学特性,本文从基因之间的关联性出发,首先基于互信息(Mutual Information,MI)算法提取出了BC患病和健康对照样本中关联度具有明显变化的基因作为特征基因,在此基础上,基于KEGG通路分析获取特征基因所涉及的信号传导通路,并利用距离相关性(Distance Correlation,DC)算法度量它们之间的串扰关系,最终探寻到26条BC患病前后串扰关系变化较大的通路,通过生物学分析得到：胰岛素信号通路(Insulin signaling pathway)、I型糖尿病信号通路(Type I diabetes mellitus pathway)、核糖体(Ribosome pathway)信号通路等通路间的串扰及特征基因的显著变化对BC的发生和发展具有重要的推动作用,研究结果为探寻BC的致病机理提供了新的思路和有益的支撑。     

对《Fuzzy random variables》一文中关于模糊集间距离的修正

本文通过实例说明了文献[1]中在_0(R)定义的距离在某些情况下不尽合理,从而修正了这个距离定义,并证明了在新的距离下_0(R)是完备的度量空间,且在此空间成立广义的勒贝格控制收敛定理.     

A comparison between two distance-based discriminant principles

A distance-based classification procedure suggested by Matusita (1956) has long been available as an alternative to the usual Bayes decision rule. Unsatisfactory features of both approaches when applied to multinomial data led Goldstein and Dillon (1978) to propose a new distance-based principle for classification. We subject the Goldstein/Dillon principle to some theoretical scrutiny by deriving the population classification rules appropriate not only to multinomial data but also to multivariate normal and mixed multinomial/multinormal data. These rules demonstrate equivalence of the Goldstein/Dillon and Matusita approaches for the first two data types, and similar equivalence is conjectured (but not explicitly obtained) for the mixed data case. Implications for sample-based rules are noted.     

Metric family portraits

By associating a whole distance matrix with a single point in a parameter space, a family of matrices (e.g., all those obeying the triangle inequality) can be shown as a cloud of points. Pictures of the cloud form a family portrait, and its characteristic shape and interrelationship with the portraits of other families can be explored. Critchley (unpublished) used this approach to illustrate, for distances between three points, algebraic results on the nesting relations between various metrics. In this paper, these diagrams are further investigated and then generalized. In the first generalization, projective geometry is used to allow the geometric representation of Additive Mixture, Additive Constant, and Missing Data problems. Then the six-dimensional portraits of four-point distance matrices are studied, revealing differences between the Euclidean, Additive Tree, and General Metric families. The paper concludes with caveats and insights concerning families of generaln-point metric matrices.     

略论云南遥距教育的办学经济效益

彼得斯 (Peters,2000)认为 ,遥距教学是一种新型的、工业化和技术性的教育 ,这一观点与“经济效益”息息相关。从宏观经济学的角度来分析 ,遥距教育因其有着较少的教师数量、较多的学生数量及高度的灵活性 ,往往能迅速为一个地区大规模地提供所需的教育 ,从而也降低了教育成本 ,提高了经济效益。云南电大自成立之日起就是一所利用多媒体教学资源 ,采用遥距教育的没有围墙的大学。本文从教材建设、网络技术平台建设、师资队伍建设等方面 ,对云南电大办学经济效益进行粗略地分析