应用模糊C均值聚类法判别同调机群正确性研究

利用BPA软件以新英格兰10机39节点系统为例,验证模糊C均值聚类法判别同调机群的正确性。     

基于时间聚类的加权关联规则及其在企业中的应用

针对煤炭企业采用的基于关联规则的数据挖掘技术存在的不足,文章提出了一种基于时间聚类的加权关联规则挖掘算法,分析了关联规则的基本概念,简要介绍了传统Apriori算法原理,详细介绍了基于时间聚类的加权关联规则挖掘算法原理及实现．实际应用范例表明,与Apriori算法相比,基于时间聚类的加权关联规则挖掘算法具有较高的准确性．     

Fault diagnosis model based on fuzzy support vector machine combined with weighted fuzzy clustering

A fault diagnosis model is proposed based on fuzzy support vector machine (FSVM) combined with fuzzy clustering (FC).Considering the relationship between the sample point and non-self class,FC algorithm is applied to generate fuzzy memberships.In the algorithm,sample weights based on a distribution density function of data point and genetic algorithm (GA) are introduced to enhance the performance of FC.Then a multi-class FSVM with radial basis function kernel is established according to directed acyclic graph algorithm,the penalty factor and kernel parameter of which are optimized by GA.Finally,the model is executed for multi-class fault diagnosis of rolling element bearings.The results show that the presented model achieves high performances both in identifying fault types and fault degrees.The performance comparisons of the presented model with SVM and distance-based FSVM for noisy case demonstrate the capacity of dealing with noise and generalization.     

Fitting Unstructured Finite Mixture Models in Longitudinal Design: A Recommendation for Model Selection and Estimation of the Number of Classes

In longitudinal design, investigating interindividual differences of intraindividual changes enables researchers to better understand the potential variety of development and growth. Although latent growth curve mixture models have been widely used, unstructured finite mixture models (uFMMs) are also useful as a preliminary tool and are expected to be more robust in identifying classes under the influence of possible model misspecifications, which are very common in actual practice. In this study, large-scale simulations were performed in which various normal uFMMs and nonnormal uFMMs were fit to evaluate their utility and the performance of each model selection procedure for estimating the number of classes in longitudinal designs. Results show that normal uFMMs assuming invariance of variance–covariance structures among classes perform better on average. Among model selection procedures, the Calinski–Harabasz statistic, which has a nonparametric nature, performed better on average than information criteria, including the Bayesian information criterion.     

企业异质性与贸易中介理论研究新进展

新新贸易理论诞生近十年来,贸易理论家围绕企业异质性假定进行了细致而富有成效的拓展研究。其中引人注目的是融入贸易中介的分析,打破了已有研究关于直接出口的局限,并分别基于异质性和企业内生边界视角,解释了中介技术和不完全合约对企业直接出口和中介出口等不同出口决策及福利分配的影响。本文梳理了国外最新文献中企业异质性与贸易中介理论的研究进展,解析了将贸易中介引入新新贸易理论的微观机理,并展望了其未来的发展方向。     

金边瑞香茎尖外植体快繁技术的研究

以金边瑞香茎尖为外植体,探讨了不同培养基对丛生芽的诱导增殖、芽苗生根的影响。结果表明:1)金边瑞香丛生芽的诱导增殖可用培养基B5大量无机成分 MS微量无机成分 B5维生素 BA2.0 mg.L-1;2)丛生芽形成一定高度的芽苗后,接入培养基1/2B5 NAA50 mg.L-1中培养10 d,然后接入1/2B5培养基中可获得最佳生根效果.     

Regional creative industries policy-making under New Labour

This article analyses creative industries policy in the English regions under New Labour (1997–2010). It examines the ideas behind regional creative industries policies (RCIPs) and their implementation. Focusing on the activities of the English regional development agencies, the primary bodies responsible for the implementation of creative industries policy in the British regions, the article places regional cultural policy during the New Labour period within its broader political, social and economic contexts. It explains and evaluates New Labour's RCIPs, arguing that creative industries policy at the regional level changed over the course of New Labour's three terms of office, becoming increasingly economistic at the expense of a more social democratic vision of regional equality and democracy. We identify three issues that were problematic for New Labour's RCIP: a reliance on the idea of “clusters”, commercialisation and shifting regional governance.     

模糊聚类在学生综合素质评价上的应用

在现行的教育过程中,对学生的管理也是一门科学,教师在教学过程中,不应该仅仅是传授知识,而应该运用科学的方法教育学生,往往将传授知识和管理相结合的教学方法能做到事半功倍的效果。本文针对现行的教育,运用模糊聚类的思想,根据学生成绩将学生分类,以便在教学管理中,根据不同阶段的学生提出不同的教学要求和选取不同的教学、辅导方法,以全面提高学生的综合素质。     

家族企业传承意愿、伙伴间信任关系与网络战略选择

经过三十多年的快速发展,我国家族企业正在进入传承的高峰时期,而家族传承是家族企业最显著的特征之一;网络战略是家族企业成长的重要方式和策略选择。采用对浙江和重庆家族企业的调查数据,实证检验家族传承意愿对家族企业网络战略选择的影响,并分析伙伴间信任关系在家族传承意愿与家族企业网络战略选择之间的中介作用,结果表明：（1）家族传承意愿正向影响家族企业网络中心度和密度,负向影响网络关系持久度和开放度;（2）伙伴间信任关系在家族传承意愿与家族企业网络中心度之间起完全中介作用,而在家族传承意愿与家族企业网络密度之间起部分中介作用。家族企业网络战略选择应与家族传承意愿相匹配,着力培育相互信任的伙伴关系,并加强对伙伴间关系的维护和管理。     

中国体育用品制造业产业集聚程度变动趋势的定量研究

基于市场行业集中度指标(CRn)与产业空间集聚指数(β),对中国7大类体育用品制造行业2002-2007年的产业集聚水平进行测定及动态分析.结果表明:2002-2007年我国7大类体育用品制造行业的产品销售收入排名前6位的省(市)主要是广东、江苏、山东、浙江、福建和上海,该6个地区均隶属东部,中、两部则榜上无名,说明中国体育用品制造业产业集聚程度的区域差异非常明显.2002-2007年我国体育用品制造业、球类制造业、训练健身器材制造业、运动防护用具制造业、文教体育用品制造业与其他体育用品制造业的产业空间集聚指数均呈增长趋势,而体育器材及配件制造业的产业空间集聚指数却呈下降趋势.按其增幅大小顺序依次为:运动防护用具制造业>文教体育用品制造业>球类制造业>体育用品制造业>其他体育用品制造业>训练健身器材制造业.2007年运动防护用具制造业、球类制造业和其他体育用品制造业的产业空间集聚指数分别位居前三甲(β>0.1),其余4大类体育用品制造行业也均大于0.05,产业空间集聚指数位于0.05及以下的体育用品制造行业则为无,表明我国区域体育用品制造行业的空间集聚程度已非常显著.同时,就国内7大类体育用品制造行业的产业空间集聚指数与工业生产总值展开相关分析发现,中国工业总产值和体育用品制造业空间集聚程度存在较高的正相关关系.