产业集群:发展我国体育用品产业的战略选择——以福建晋江运动鞋产业集群为例   总被引：4，自引：0，他引：4  

张沛中  张奇智 《福建体育科技》2005,24(1):26-28

当前我国生产体育用品的企业大都是中小企业,与大企业比较,中小企业由于规模小、产品科技含量低、营销网络不完善等方面的原因往往缺乏竞争力。然而本文通过对福建晋江运动鞋产业集群的研究发现,如果中小企业通过形成产业集群,发挥产业集群的知识溢出效应、创新效应、追赶效应、吸聚效应和植根效应,就能够大大提高中小企业的竞争力。因而,在我国加入WTO,国外大型体育用品公司大规模涌入中国市场的情况下,产业集群无疑是发展我国体育用品产业的重要战略选择。  相似文献   

基于混合索引的中文全文检索系统研究   总被引：1，自引：0，他引：1  

靖培栋  宋雯斐 《中国图书馆学报》2008,34(1)

在中文全文检索系统中引入了混合索引,建立了混合索引之Hash索引,给出了Hash索引在内存中的存储结构,并给出了这种索引下的检索算法。这种索引既能保证索引的全面性,又能提高系统检索效率。通过实际构建系统,探讨了基于混合索引的中文全文检索系统的实现。  相似文献   

基于信息集群:图书馆组织架构研究   总被引：6，自引：0，他引：6  

周文芳  金中仁 《大学图书馆学报》2008,26(4):27-30,34

分析了图书馆现有组织体系的弊端和集群组织结构形式的优势,提出了图书馆信息集群组织结构模型。建议在有关部门的统一领导与协调下,各系统图书馆组成实质性信息集群共同体,这是解决彼此之间条块分割的有效途径。  相似文献   

Coordinating multiple representations of polynomials: What do patterns in students' solution strategies reveal?     

《Learning and Instruction》2017

We investigate the strategies used by 64 advanced secondary mathematics students to identify whether a given pair of polynomial representations (graphs, tables, or equations) corresponded to the same function on an assessment of coordinating representations. Participants also completed assessments of domain-related knowledge and background skills. Cluster analysis of strategies by representation pair revealed patterns in the participants' strategy use. Two clusters were identifiable on tasks that required matching equations to graphs and graphs to tables. We identified overlap between these two clusters, suggesting that while the representation pair influenced strategy choice, there was also a general distinction between students who used more and less sophisticated strategies. However, students who used more sophisticated coordination strategies were similar to the others on measures of domain-specific knowledge or background skills. We consider implications for future investigations testing interventions to promote coordinating representations.  相似文献   

Private secondary schools in Indonesia: What is driving the demand?     

《International Journal of Educational Development》2016

Despite recent evidence that students in public schools significantly outperform their private school counterparts, private schooling continues to account for approximately 40% of secondary school enrolments in Indonesia. In an effort to explain this sustained demand, we combine analyses of PISA data with in-country interviews and school visits. Ultimately, we find that although government dependent private schools are underfunded with a high proportion of uncertified, underpaid teachers (with limited access to training and professional development), demand remains high due to their focus on religious training and education, as well as their ability to increase educational access for low-income families.  相似文献   

快速聚类分析算法在CRM中客户定位的应用   总被引：1，自引：0，他引：1  

范潇允 《温州职业技术学院学报》2006,6(3):30-32

客户关系管理是一个以客户为中心保持企业与客户互动的过程。把聚类分析用于客户关系管理,可以使得本企业更有针对性地与客户保持良好的关系。聚类分析算法可以用于客户关系管理的决策支持系统中。  相似文献   

关于谱分解估计和方差分析估计在线性混合模型中的比较     

史建红 《长治学院学报》2003,20(5):1-5

在文献[1]中提出的谱分解估计是一种在线性混合模型中同时估计固定效应和方差分量的新方法.在本文中,我们对带有两个方差分量的线性混合模型进行了谱分解估计和方差分析估计的比较.得出了方差分量的这两种估计在某些条件下方差相等,而且谱分解估计具有一些方差分析估计的最优性.  相似文献   

2009-2018年高校图书馆读者借阅规律演化探究——以北京大学图书馆为例     

吴亚平  周春霞  张海舰 《大学图书馆学报》2020,(2):69-75

借书数据是图书馆特有的、规范性强、延续性强的读者数据之一,探究其中蕴含的图书馆资源利用规律的变迁和读者借阅倾向的演化,是了解读者、亲近读者从而优化图书馆服务的基础。聚焦北京大学图书馆2009—2018年的借书数据,通过聚类分析、时间演化分析等方法,挖掘读者借书时间、借书主题、热门作者的演化规律。结果显示,近十年来,图书馆的借书服务努力克服时空限制,推动常态化服务的效果显著;不同类别图书间的阅读差异有所缩小,跨学科阅读现象更为普遍;上升类热门作者的出现通常与社会事件、阅读推广活动有一定关联。基于此结论为图书馆的资源建设和服务优化提出有益参考,丰富了图书馆读者数据的价值挖掘研究。  相似文献   

WOMBAT A tool for mixed model analyses in quantitative genetics by restricted maximum likelihood （REML）   总被引：31，自引：0，他引：31  

Meyer K 《Journal of Zhejiang University. Science. B》2007,8(11):815-821

WOMBAT is a software package for quantitative genetic analyses of continuous traits, fitting a linear, mixed model; estimates of covariance components and the resulting genetic parameters are obtained by restricted maximum likelihood. A wide range of models, comprising numerous traits, multiple fixed and random effects, selected genetic covariance structures, random regression models and reduced rank estimation are accommodated. WOMBAT employs up-to-date numerical and computational methods. Together with the use of efficient compilers, this generates fast executable programs, suitable for large scale analyses. Use of WOMBAT is illustrated for a bivariate analysis. The package consists of the executable program, available for LINUX and WINDOWS environments, manual and a set of worked example, and can be downloaded free of charge from http://agbu. une.edu.au/~kmeyer/wombat.html  相似文献   

基于PPC-GA的细分模型在用电客户划分中的应用     

杨薇 《鞍山师范学院学报》2011,13(2):56-57

将PPC-GA应用于供电企业客户群细分问题,主要从客户的购电水平、信用状态、发展潜力和用电特征等几个方面进行描述和细分.得出具有代表性的3个中心点,实现了对客户的细分和精细营销.  相似文献