关于测绘技术自动化进行分析

地形测量学是研究和确定地球的形状、大小、重力场,整体局部运动和地面点的集合位置以及他们的变化理论和技术的学科。传统的测绘包括控制测量、地形测量、施工测量、竣工测量和变形监测5个部分。本文阐述了地形测量和测绘技术的相关概念及目前地形测量的测绘自动化技术,并探讨了测绘技术自动化技术的发展趋势。     

MFC框架下三维场景的绘制与交互控制

通过一个实例,讲述了在MFC框架下使用OpenGL函数来快速构建一个可以交换控制的三维球体。MFC框架编程,在获得设备环境对象后,使用绘图函数完成绘图工作,并编辑应用程序菜单为菜单项连接处理函数。利用OpenGL开发库函数,在VC＋＋编译环境下,实现了三维物体的渲染。     

Science Letters:Assignment of CCR7 gene to chicken chromosome 27 by radiation hybrid panel mapping

The protein encoded by CC chemokine receptor 7 (CCR7) is a member of the G protein-coupled receptor family. This receptor was identified as a gene induced by the Epstein-Barr virus (EBV), and is thought to be a mediator of EBV effects on B lymphocytes. This receptor is expressed in various lymphoid tissues and activates B and T lymphocytes. It has been shown to control the migration of memory T cells to inflamed tissues, as well as stimulate dendritic cell maturation. To map the CCR7 gene in chicken chromosome, a 6 000 rads chicken-hamster radiation hybrid panel (ChickRH6) was used. PCR of samples from ChickRH6 revealed that the location of CCR7 gene is linked to the maker SEQ0347 (6 cR away) with LOD score of 16.6 and that the marker SEQ0347 is located on chromosome 27 at 27 cR of RH (radiation hydrid) map. We compared the corresponding human mRNA sequence with the predicted coding sequence of chicken CCR7 gene, and found that the assembled contig shared a high percentage of similarity with that of the human gene.     

凸度量空间中相容映象的不动点及非线性映象的迭代序列的收敛性

本文讨论凸度量空间中相容映象的不动点的存在性以及非线性映象的迭代序列的收敛性。所得结果推广和发展了参考文献[3]～[17]中的一些主要结果。     

Concept mapping as a follow-up strategy to learning from texts: what characterizes good and poor mappers?

Concept maps consist of nodes that represent concepts and links that represent relationships between concepts. Various studies have shown that concept mapping fosters meaningful learning. However, little is known about the specific cognitive processes that are responsible for such mapping effects. In a thinking-aloud study, we analyzed the relations between cognitive processes during concept mapping as well as the characteristics of the concept maps that the learners produced and learning outcomes (38 university students). To test whether differences in learning outcome are due to differences in general abilities, verbal and spatial abilities were also assessed. In a cluster-analysis two types of ineffective learners were identified: ‘non-labeling mappers’ and ‘non-planning mappers’. Effective learners, in contrast, showed much effort in planning their mapping process and constructing a coherent concept map. These strategies were more evident in students with prior concept-mapping experience (‘advanced beginners’) than in those who had not used this learning strategy before (‘successful beginners’). Based on the present findings, suggestions for a direct training approach (i.e., strategy training with worked-out examples) and an indirect training approach (i.e., supporting the learners with strategy prompts) were developed.     

Towards mapping library and information science

In an earlier study by the authors, full-text analysis and traditional bibliometric methods were combined to map research papers published in the journal Scientometrics. The main objective was to develop appropriate techniques of full-text analysis and to improve the efficiency of the individual methods in the mapping of science. The number of papers was, however, rather limited. In the present study, we extend the quantitative linguistic part of the previous studies to a set of five journals representing the field of Library and Information Science (LIS). Almost 1000 articles and notes published in the period 2002–2004 have been selected for this exercise. The optimum solution for clustering LIS is found for six clusters. The combination of different mapping techniques, applied to the full text of scientific publications, results in a characteristic tripod pattern. Besides two clusters in bibliometrics, one cluster in information retrieval and one containing general issues, webometrics and patent studies are identified as small but emerging clusters within LIS. The study is concluded with the analysis of cluster representations by the selected journals.     

多异构数据库环境下的数据共享方案研究

XML是一种具有通用格式的文档结构，其自描述性的特点使得其非常适合于作为数据交换中传输的中间格式；Java对象（JO）具有更活的数据操纵能力。在其上进行数据操作具有简单、方便的优点。文章提出了一种基于数据库记录、Java对象、XML三者相互转换实现多并构数据库环境下数据共享问题的解决方案，该方案能在较大程度上减少代码的编写并提高数据共享的效率。     

我国教育技术学者合著网络知识图谱构建研究

知识图谱可以以可视化的形式展现学科的知识体系,借助教育技术期刊载文中的作者合著信息,可以构建出我国教育技术学者合著网络知识图谱;通过社会网络分析方法,可以对合著网络进行整体属性、社群结构、中心性、小团体、核心—边缘结构分析,从而得出合著网络的各项特征。结果显示,我国教育技术学者合著网络的密度较小,网络聚集度不大,虽具有小世界效应特征,但连通性较差,合著局限在小圈子内,同时具有核心—边缘结构。可划分为15个合著群体,有较多的高产合著组合和合著小团体,内部派系比较复杂,不过规模都较小,他们信息分享和科研合作机会的差别较大,黄荣怀、何克抗、李克东等学者是合著网络的核心学者。     

集值映射Henig有效解的最优性条件

在锥偏序Banach空间中利用集值映射的上图导数引进了Henig有效意义下的广义梯度,在一定条件下,利用凸集分离定理证明了该广义梯度的存在性。作为应用,给出了用广义梯度刻画集值优化问题Henig有效解的充分条件。