基于科学知识图谱的国内外概化理论研究可视化分析

研究对比国内外概化理论研究的异同,为国内概化理论研究发展提供参考。基于CNKI、Webof Science数据库,分别选取2001—2020年中文373篇、外文734篇文献,借助CiteSpace软件定量分析国内外研究的发文数量、主题内容和合作关系。结果表明,国内外概化理论研究呈现积极增长态势;美国与加拿大对概化理论研究关注度一直保持较高水平,与世界各国合作紧密;国内的概化理论研究深度略低于国外,作者及机构之间的合作较分散,应加强与国际的交流与合作。     

体育学学者学术合作网络对学术话语权影响的实证研究

采用实证分析法,通过对2000-2020年体育类核心期刊数据库(CSSCI)的刊文数据挖掘,基于体育学术话语权理论,探析体育学学者学术合作网络对学术话语权的影响。研究发现:体育学学者合作网络的度中心性对体育学学者学术话语权有显著正向影响;中介中心性对体育学学者学术话语权有显著正向影响;结构洞对体育学学者学术话语权中的学术影响力有显著正向影响,但对学术生产力与学术引领力并不存在正向影响。研究阐释了体育学学者的合作网络对于体育学术话语权提升的重要作用,为我国体育学术话语权网络的构建提供理论参考。     

Contrastive Graph Convolutional Networks with adaptive augmentation for text classification

Text classification is an important research topic in natural language processing (NLP), and Graph Neural Networks (GNNs) have recently been applied in this task. However, in existing graph-based models, text graphs constructed by rules are not real graph data and introduce massive noise. More importantly, for fixed corpus-level graph structure, these models cannot sufficiently exploit the labeled and unlabeled information of nodes. Meanwhile, contrastive learning has been developed as an effective method in graph domain to fully utilize the information of nodes. Therefore, we propose a new graph-based model for text classification named CGA2TC, which introduces contrastive learning with an adaptive augmentation strategy into obtaining more robust node representation. First, we explore word co-occurrence and document word relationships to construct a text graph. Then, we design an adaptive augmentation strategy for the text graph with noise to generate two contrastive views that effectively solve the noise problem and preserve essential structure. Specifically, we design noise-based and centrality-based augmentation strategies on the topological structure of text graph to disturb the unimportant connections and thus highlight the relatively important edges. As for the labeled nodes, we take the nodes with same label as multiple positive samples and assign them to anchor node, while we employ consistency training on unlabeled nodes to constrain model predictions. Finally, to reduce the resource consumption of contrastive learning, we adopt a random sample method to select some nodes to calculate contrastive loss. The experimental results on several benchmark datasets can demonstrate the effectiveness of CGA2TC on the text classification task.     

T(1,2,n)∪(∪ from i=o to s C_(Pi))及补图的匹配唯一性

本文研究了图的匹配唯一性,给出了T(1,2,n)∪(s∪i=0CP i)及补图匹配唯一的充要条件.     

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。     

中原城市群等级规模结构演变分析

选用1993、1998、2004年三个阶段,从中心城市首位度、城市中心性、城市规模结构、空间分布结构等几个方面来分析中原城市群十余年来等级规模结构的演变特征,并提出在中原城市群发展过程中存在的问题以及解决这些问题的相关对策。     

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.     

一类单圈图的谱刻画

称图是由谱确定的,如果没有非同构的图具有相同的谱．用Cp标记长度为P的圈．设Hp,2标记一个长度为p的圈上的任意一个点邻接两个度为1的点．本文将证明图Hp,2（p是正奇数）由它的邻接谱确定的,并且图Hp,2是由它的拉普拉斯谱确定的．     

Structural change in search engine news service: a social network perspective

This research investigates structural change made by Naver's online news section and how it has impacted the overall traffic flow of Korea's online news. This paper examined 45 websites in 2008 and 2010, and the total number of pages viewed within these sites was considered in the analysis. Social network analysis was applied to study the relationships between the news sites. The analysis through degree centrality and Bonacich powers shows that there has been a shift in market leadership. In 2007, Naver, the top search engine in Korea, stepped down from its leading position after they started to provide news services. Daum, the second largest search engine, has taken over the central position as the most influential news site. Based on the results of this study, practical implications for online service markets and theoretical implications for online services are recommended accordingly.