支配数为2的图的最小特征值

主要考虑简单图,其特征值定义为它的邻接矩阵的特征值.在所有给定阶数且支配数为2的连通图中,完全刻画了最小特征值达到极小的图.     

几种提高激光打标机控制精度的软件措施

针对在开发激光打标机控制软件的过程中，激光头不能准确回到原点、字符笔画残缺等现象，提出了对立线插补算法的改进措施以及多种延时措施。     

教育知识图谱构建中的标准词汇参考模型研究

教育是典型的知识密集型领域,因此,进行领域知识的共享研究对教育领域的发展非常重要。多年信息化的历史经验告诫我们:共享的前提是必须对领域资源实施标准化。尽管我国教育领域研发了系列教育元数据标准,但是从智慧教育的需求来看,这些标准普遍表现为缺乏语义、比较零散、体系不够完善等。随着近些年知识图谱的提出,为教育资源的知识整合发展提供了重要的技术手段。然而,目前知识图谱构建的主要焦点在构建技术方面,忽视了构建中的标准化问题。长此以往,领域将会构建出很多“知识孤岛”。为解决这些问题,本文在对国内外教育领域内标准进行研究的基础上,以系统理论为依据提出并构建了一个集预定义词汇的W3C语义Web标准、顶层词汇标准和领域词汇标准于一体的三层架构模型——教育资源知识图谱标准词汇参考模型。基于该模型建构知识图谱,不仅为教育领域数据的标准化提供标准词汇参考,而且也为规范构建教育领域知识图谱提供了参考。     

Teaching history through the use of story: working with early years practitioners who do not have qualified teacher status,in settings other than schools

This article arose from a series of workshops with practitioners in early years teaching. The workshops addressed how history could be taught to very young children, three‐ to five‐years‐old. The authors were aware that there was a widely held belief that history was inappropriate for the very young child. The authors felt that this was because of a common view that history was solely concerned with facts. There was also a prevalent view that, as history was about chronology (time), it was too difficult a subject for very young children, for whom ‘yesterday’ and ‘tomorrow’ had little meaning.

This article argues that successful teaching of history is possible with very young children if the teaching concentrates on interpretation and enquiry. Through using story, young children are able to interpret the behaviour, motivation and intent of the characters. The practitioners are able to question the child as to why s/he interprets the character’s actions in the way that s/he does. In other words the practitioner asks for evidence: the essence of history. When considering time, the authors’ note that young children have a subjective understanding of time and this can be used to develop a growing awareness of chronology.     

Nepotistic relationships in Twitter and their impact on rank prestige algorithms

Micro-blogging services such as Twitter allow anyone to publish anything, anytime. Needless to say, many of the available contents can be diminished as babble or spam. However, given the number and diversity of users, some valuable pieces of information should arise from the stream of tweets. Thus, such services can develop into valuable sources of up-to-date information (the so-called real-time web) provided a way to find the most relevant/trustworthy/authoritative users is available. Hence, this makes a highly pertinent question for which graph centrality methods can provide an answer. In this paper the author offers a comprehensive survey of feasible algorithms for ranking users in social networks, he examines their vulnerabilities to linking malpractice in such networks, and suggests an objective criterion against which to compare such algorithms. Additionally, he suggests a first step towards “desensitizing” prestige algorithms against cheating by spammers and other abusive users.     

基于社会网络分析的农业网群影响力研究

运用社会网络分析法,从中国农业网站排行的前100名中筛选出95个有效网站,根据主办单位的不同性质,将农业网站划分为企业网群、高校网群、政府网群、科研院所网群、个人网群和大众媒体网群.根据网站间的链接关系构建了网络关系图,对比分析了农业整体网群和子网群的网络结构、中心度争网络的关联性,找到了整体网网群和子网群中的权威网站,并发现各网群的不同影响力,希望指导不同用户更有效的查找和利用农业信息.     

基于社会网络分析的科技网群影响力评价

在综合分析国内外政务网站评价方法的基础上,利用SocSciBot软件对科技部门户网站科技网群栏目内的地方科技子站的页面进行链接下载,构建社会网络分析数据集,围绕科技网群进行中心性分析、核心-边缘分析和聚类派系分析,从结构关系的角度揭示科技网群内部之间的联系,为下一步科技网群的建设提出参考建议。     

图像检索技术研究进展

本文介绍了图像检索技术发展的各个阶段,重点介绍基于内容的图像检索技术和基于图理论的图像检索技术。     

C_n~2图的符号控制数

设图G=G(V,E),令函数f:V→{-1,1},f的权w(f)=∑v∈Vf[v],对v∈V,定义f[v]=∑u∈N[v]f(u),这里N[v]表示V中顶点v及其邻点的集合。图G的符号控制函数为f:V→{-1,1}满足对所有的v∈V有f[v]≥1,图G的符号控制数γs(G)就是图G上符号控制数的最小权,称其f为图G的γs-函数。研究了C2n图,通过给出它的一个γs-函数得到了其符号控制数。     

关于nC_3~1UmC_4~2的优美性

本文给出一类非连通图 nC_3~1UmC_4~2,并证明了这类非连通图是优美图。