产业集群竞争力定量评价GEMN模型及其应用

科学合理地评价产业集群竞争力,既是学术界关注的一个热点,又是各级政府亟待解决的现实难题.从创新网络的视角构建了一种以GEM模型为母体架构的评价产业集群竞争力的改进模型--GEMN模型,本文介绍了该模型的结构、量化处理以及应用等问题,为产业集群竞争力定量评价提供了系统方法.     

Cluster Synchronization in a Complex Dynamical Network with Two Nonidentical Clusters

This paper further investigates cluster synchronization in a complex dynamical network with two-cluster. Each cluster contains a number of identical dynamical systems, however, the subsystems composing the two clusters can be different, i.e., the individual dynamical system in one cluster can differ from that in the other cluster. Complete synchronization within each cluster is possible only if each node from one cluster receives the same input from nodes in other cluster. In this case, the stability condition of one-cluster synchronization is known to contain two terms： the first accounts for the contribution of the inner-cluster coupling structure while the second is simply an extra linear term, which can be deduced by the ＂same-input＂ condition. Applying the connection graph stability method, the authors obtain an upper bound of input strength for one cluster if the first account is known, by which the synchronizability of cluster can be scaled. For different clusters, there are different upper bound of input strength by virtue of different dynamics and the corresponding cluster structure. Moreover, two illustrative examples are presented and the numerical simulations coincide with the theoretical analysis.     

基于产业集群的技术创新服务体系构建研究——以南阳玉雕文化产业为例

技术创新服务体系是企业技术创新的公共支撑和发展动力,其构建应结合区域经济的特色尤其是区域经济的产业集群进行,可以有效实现产业集群内的资源整合和开放服务。河南南阳玉雕文化产业集群已初具规模,构建一个具有玉雕文化特色的网络化产业集群技术创新服务体系,对于促进南阳玉雕文化产业升级、提高产业档次和市场效率有着积极的意义。     

基于规则的分布式集群运算系统研究

在分析分布式集群运算需求的基础上,提出了按操作构件分解、基于规则调度构建分布式集群运算服务方法,实现业务运算的按需服务．并给出了试验系统总体设计和初步验证结果。     

聚类分析在图书馆书籍管理中的应用

阐述了K-means聚类方法在图书馆书籍借阅分析中的应用,以及针对图书馆借阅数据的特点将特征聚类、无量纲化方法引入到K-means算法中.     

The hidden disintegration of cluster heterogeneity in Fe-based glass-forming alloy melt

The evolution of liquid metal at high temperature is known much less than their solid states. This is partially due to that the message concerning clusters, metastable phase or heterogeneity in liquid is usually too slight to be traced. Here, we shed some light on the nature of structural evolution of Fe-based glass-forming alloy during overheating process by the investigation of high-temperature melt viscometry and first principles simulations. It was found that a structural transition around 1400 ℃ occurred in the melts of initial homogeneous ingot, heterogeneous ingot and amorphous ribbons jointly, and was confirmed by the results from differential scanning calorimeter(DSC), and ab initio molecular dynamics(AIMD). Combining these results with Fe-Si-B ternary phase diagram and the melting characteristics of Fe-B compounds, it is safe to conclude that the disintegration of Fe_2B type clusters to Fe_3B-type clusters leads to the observed transition. These results offer a significant reference for the preparation and property control of Fe-based amorphous alloys.     

The analysis of free-sorting data: Beyond pairwise cooccurrences

Free-sorting data are obtained when subjects are given a set of objects and are asked to divide them into subsets. Such data are usually reduced by counting for each pair of objects, how many subjects placed both of them into the same subset. The present study examines the utility of a group of additional statistics. the cooccurrences of sets of three objects. Because there are dependencies among the pair and triple cooccurrences, adjusted triple similarity statistics are developed. Multidimensional scaling and cluster analysis — which usually use pair similarities as their input data — can be modified to operate on three-way similarities to create representations of the set of objects. Such methods are applied to a set of empirical sorting data: Rosenberg and Kim's (1975) fifteen kinship terms.The author thanks Phipps Arabie, Lawrence Hubert, Lawrence Jones, Ed Shoben, and Stanley Wasserman for their considerable contributions to this paper.     

渗流模型在临界现象和相变中的应用

本文阐述了渗流模型及其特征和它与临界现象及相变的联系，举例说明它在临界现象与相交中的应用，并给出了用计算机模拟座渗流的例子．     

A study of standardization of variables in cluster analysis

A methodological problem in applied clustering involves the decision of whether or not to standardize the input variables prior to the computation of a Euclidean distance dissimilarity measure. Existing results have been mixed with some studies recommending standardization and others suggesting that it may not be desirable. The existence of numerous approaches to standardization complicates the decision process. The present simulation study examined the standardization problem. A variety of data structures were generated which varied the intercluster spacing and the scales for the variables. The data sets were examined in four different types of error environments. These involved error free data, error perturbed distances, inclusion of outliers, and the addition of random noise dimensions. Recovery of true cluster structure as found by four clustering methods was measured at the correct partition level and at reduced levels of coverage. Results for eight standardization strategies are presented. It was found that those approaches which standardize by division by the range of the variable gave consistently superior recovery of the underlying cluster structure. The result held over different error conditions, separation distances, clustering methods, and coverage levels. The traditionalz-score transformation was found to be less effective in several situations.     

新疆入境旅游市场竞争态势与发展对策研究

通过聚类分析法,分析了新疆入境旅游客源市场2001年-2007年的分布情况;利用波士顿矩阵法,建立了新疆入境旅游客源地市场及目的地市场的2001年-2007年竞争态模型,并分析了各市场在入境旅游竞争中所处的地位与态势,为新疆入境旅游业的发展战略的制定和市场开拓提出了对策建议.