How social network position relates to knowledge building in online learning communities

Social Network Analysis, Statistical Analysis, Content Analysis and other research methods were used to research online learning communities at Capital Normal University, Beijing. Analysis of the two online courses resulted in the following conclusions: (1) Social networks of the two online courses form typical core-periphery structures; (2) Social networks of the two online courses contain “structural holes,” where some actors position themselves to become potential opinion-leaders within their social networks; (3) Actors, variously positioned within a core-periphery structure, show quite significant differences in terms of knowledge building; (4) Taking “structural holes” into account, there exist considerable differences in knowledge building between opinion-leaders and non opinion-leaders; (5) Actors in the “core” and “structural hole” positions have very different characteristics in terms of knowledge building. These actors in particular play important roles in online learning communities, impacting on the level of the constructed knowledge.     

高职工程机械类专业毕业生就业质量跟踪调查研究

从企业对毕业生的评价指标、毕业生对用人单位评价指标、毕业生平均月工资、专业对口率、就业方式等方面入手,通过对高职工程机械专业2013届毕业生生就业质量进行跟踪调查和分析,提出提升高职工程机械专业毕业生就业质量的启示,为今后高职人才培养模式改革和学校的教学改革提供一定的依据.     

包头游泳健身群体运动开展情况调查与分析

包头游泳健身群体当中,男性参与的比例要高于女性;中老年群体参与比例较大,青年人和儿童参与比例较低;参与游泳运动的消费方式中,以次卡或月卡为主,在消费上,大部分游泳者都有选择游泳健身消费的偏好;包头市室内游泳场馆消费价格太高、交通不便是目前影响包头市大众游泳运动开展的主要外因;时间因素、经济因素、地域因素是影响包头市大众游泳运动开展的主要内因.     

基于Universum学习的核聚类方法

为解决原始核聚类(Kernel Clustering, KC)中模式信息不足、聚类结果不佳的缺点,以KC为基础,利用Universum学习带来的优势,提出基于Universum学习的核聚类(Universum learning based Kernel Clustering, UKC)方法.首先利用Universum学习生成相应的Universum模式,再利用KC算法把数据集分割成多个簇,最后利用每个簇中所包含的Universum模式和训练模式来更新该簇,从而使得这些簇更加合理.实验表明,该算法可以更好地改善聚类效果和分类器的分类性能、泛化能力和计算效率.虽然该方法的步骤比KC多,但是其较好的聚类性能可以帮助人们处理分类问题.     

黜顾与崇顾：顾恺之画史地位的论辩之争

顾恺之在中国美术史上的历史地位几经变迁,先是黜顾,后来又崇顾。顾恺之的善变生涯是黜顾与崇顾论辩之争的主体根源。批评家与顾恺之的生活时距是黜顾与崇顾论辩之争的时代根源。艺术家的生活境遇、批评家与顾恺之之间的时代差距、艺术潮流变迁和文论发展阶段都会给批评家提供更多审美移情的空间,给批评家正确评价艺术家的历史地位增加难度。     

Unambiguous evidence of brilliant iridescent feather color from hollow melanosomes in an Early Cretaceous bird

Various plumage colors are roughly produced by pigment-based colors and structural colors[1,2].Brilliant iridescent plumage colors(in which the color changes de...     

Red-light excited efficient metal-free near-infrared room-temperature phosphorescent films

A set of red-light-excited,metal-free room-temperature phosphorescence(RTP)systems was constructed with brominated phenolsulfonephthaleine derivatives.The best ...     

The trajectory of the “Third World” in early modern Chinese thought

In this essay, I trace two aspects of the thought on the “Third World” in early modern China: how to understand the world revolution, and how to create a new China. While focusing on two trendy notions at that time, i.e. “Chinese revolution” (Zhongguo geming), and “nong country” (nongguo), I argue that the thought on the “Third World” in early modern China breaks free of the shackle of fashionable theories and draws upon local circumstances and China’s own repertoire of power when exploring an ideal of a new world. While the difficulty in confronting the “Third World” consciousness in today’s China is still overwhelming, the fact that we now remember “the spirit of Bandong” signals some progress.     

中国舞龙运动价值功能的探讨

舞龙运动是我国民族传统的体育项目,本文从民族、体育和社会等学科的角度,揭示和探讨舞龙运动特定的历史性、传统文化性、时代发展性及其自身具有的教育、弘扬民族文化、增强民族凝聚力、健身娱乐等社会价值功能。     

武术套路运动对女大学生骨密度和基本体质指标的影响

目的：探讨武术套路运动对普通女大学生骨密度和基本体质指标的影响,并分析其原因。方法：以成都体育学院健康女大学生20名作为研究对象,测量运动组（武术系武术套路学生）和对照组（外语系较少参加运动学生）的骨密度和体重、瘦体重、体重指数等基本体质指标,并将结果进行分析比较。结果：与对照组相比,运动组的超声衰减、超声声速和骨强度指数均较高,并具有非常显著性的差异;运动组的各项体质指标值均高于对照组,其中体重指数的差异具有非常显著性水平。