值日报告提高学生听说能力的行动研究

在教学过程中通过开展行动研究,教师不断反思、改进教学方法,既能有效地组织好值日报告活动,帮助学生扩大知识面和词汇量,并提高他们的听说能力,同时还能促进自身的专业发展。     

A latent class vector model for preference ratings

A latent class formulation of the well-known vector model for preference data is presented. Assuming preference ratings as input data, the model simultaneously clusters the subjects into a small number of homogeneous groups (or latent classes) and constructs a joint geometric representation of the choice objects and the latent classes according to a vector model. The distributional assumptions on which the latent class approach is based are analogous to the distributional assumptions that are consistent with the common practice of fitting the vector model to preference data by least squares methods. An EM algorithm for fitting the latent class vector model is described as well as a procedure for selecting the appropriate number of classes and the appropriate number of dimensions. Some illustrative applications of the latent class vector model are presented and some possible extensions are discussed. Geert De Soete is supported as “Bevoegdverklaard Navorser” of the Belgian “Nationaal Fonds voor Wetenschappelijk Onderzoek.”     

A latent class procedure for the structural analysis of two-way compositional data

This paper develops a new procedure for simultaneously performing multidimensional scaling and cluster analysis on two-way compositional data of proportions. The objective of the proposed procedure is to delineate patterns of variability in compositions across subjects by simultaneously clustering subjects into latent classes or groups and estimating a joint space of stimulus coordinates and class-specific vectors in a multidimensional space. We use a conditional mixture, maximum likelihood framework with an E-M algorithm for parameter estimation. The proposed procedure is illustrated using a compositional data set reflecting proportions of viewing time across television networks for an area sample of households.     

论社会文化知识的传授与跨文化交际能力的培养

外语教学的终极目的就是要培养高素质、高质量的跨文化交际人才。因此,在外语教学的全过程中,在努力促使学生掌握语言知识的同时,我们还必须加强目的语国家社会文化知识的传授,着力培养学生的跨文化交际能力。这两个方面应是我们外语教学的当务之急与重中之重。     

力热实验教学对提高学生操作技能的研究与探索

力热实验是师范专业大学新生的入门实验课,是实验课程体系的重要组成部分,本文从力热实验教学过程中的教材改革和基本技能训练出发,在提高学生动手能力和操作技能等方面进行积极有效的探索,提出了规范实验教学考核和充分利用实验室资源的设想。介绍了创建省级基础物理实验示范中心工作中的设想和做法。     

以"产业"思维方式思考高等教育改革

试从高等教育的质量、效益、机制等方面对高等教育产业化进行探讨--以"产业"的思维方式研究人才的质量标准,适应"用户"需求,注重培养"关键能力",强化实践能力,突出个人特色,保证人才培养质量;教育必须讲效益;学生不仅是消费者也是参与者、创造者,学校应尊重和保护学生作为消费者的权益;让投资者成为盈利者;建立"需要者出钱"和"有钱者出钱"两种机制.     

Latent class DEDICOM

A probabilistic DEDICOM model was proposed for mobility tables. The model attempts to explain observed transition probabilities by a latent mobility table and a set of transition probabilities from latent classes to observed classes. The model captures asymmetry in observed mobility tables by asymmetric latent mobility tables. It may be viewed as a special case of both the latent class model and DEDICOM with special constraints. A maximum penalized likelihood (MPL) method was developed for parameter estimation. The EM algorithm was adapted for the MPL estimation. Two examples were given to illustrate the proposed method. The work reported in this paper has been supported by grant A6394 to the first author from the Natural Sciences and Engineering Research Council of Canada and by a fellowship of the Royal Netherlands Academy of Arts and Sciences to the second author. We would like to thank anonymous reviewers for their insightful comments.     

On appraisal models of basketball players'athletics a-bilities

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大学生能力培养分析

根据北京师范大学数学系210名学生的12门数学专业课的成绩,利用斜交旋转的因子分析,得到具有5个公共因子的斜交因子结构矩阵和相关矩阵,用以分析培养学生各种能力的问题.利用学生因子计量的得分,根据培养的能力可将学生分为5种类型.最后,从能力培养的角度,对当前的教学计划进行一些探讨.     

杉木炭疽病菌(Glomerella cingulata)潜伏侵染的研究

杉木针叶上炭疽病菌(Glomerella cingulata)的潜伏侵染研究结果表明:(1)杉木不同冠位、不同枝段和不同叶片部位的潜伏侵染率不同;(2)当年针叶5月中旬开始受侵,8月末达侵染高峰,当半个月平均气温低于10℃时不发生侵染,(3)针叶潜伏侵染率随杉木林地位级升高而增加,发病程度随地位级升高而降低,(4)病害症状于4～6月表现在先年枝梢的顶端,病害程度同针叶潜伏侵染率无关;(5)针叶中还原糖含量高似乎是影响病菌打破潜伏侵染的因素。