WSNs中基于协作通信的分簇路由算法研究

针对无线传感器网络数据信息传输可靠性,提出一种无线传感器网络中基于协作通信的分簇路由算法。该算法主要对分簇、簇间路由和簇内路由三个阶段进行了设计,依据信噪比寻找满足网络数据传输可靠性的最佳路由,实现源节点和目的节点之间的协作通信。仿真结果表明,无线传感器网络中基于协作通信的分簇路由算法能够有效地优化网络路径,提高频谱利用率,增强数据信息传输的可靠性。     

Irreconcilable differences? Ethnic intermarriage and divorce in the Netherlands, 1995-2008

This study uses population data of the Netherlands (municipality registers) between 1995 and 2008 to describe and explain the occurrence of divorce among recently newlywed interethnic and mono-ethnic couples (N = 116,745). In line with homogamy theory, divorce risks are higher for interethnic couples, in particular if the spouses were born and raised in countries that are culturally distant from each other. In addition, the effect of cultural distance is smaller for second generation immigrants than for first generation immigrants. There is no evidence for a higher risk of divorce among Black-White marriages. In line with convergence theory, results show that the higher the divorce propensity in the wife’s origin country, the higher the divorce risk of a couple is.     

论我国未成年人社区矫正体系的缺陷

未成年人本应是社区矫正的重点对象之一,但我国未成年人社区矫正体系未受到应有重视,存在着诸多问题。在立法上,未成年人社区矫正制度的独立性不足,适用的对象过于狭窄,未形成完整的法律体系。在司法实务中,未成年犯适用社区矫正的比例偏低,尤其是外地户籍未成年犯适用社区矫正的比例更低。在执法中,未成年人社区矫正机构尚未专门化,社区矫正工作人员未能实现专业化,也没有针对未成年人的个性化社区矫正项目。     

A finite mixture approach to joint clustering of individuals and multivariate discrete outcomes

In this work, we modify finite mixtures of factor analysers to provide a method for simultaneous clustering of subjects and multivariate discrete outcomes. The joint clustering is performed through a suitable reparameterization of the outcome (column)-specific parameters. We develop an expectation–maximization-type algorithm for maximum likelihood parameter estimation where the maximization step is divided into orthogonal sub-blocks that refer to row and column-specific parameters, respectively. Model performance is evaluated via a simulation study with varying sample size, number of outcomes and row/column-specific clustering (partitions). We compare the performance of our model with the performance of standard model-based biclustering approaches. The proposed method is also demonstrated on a benchmark data set where a multivariate binary response is considered.     

A new approach: Interrelated two-way clustering of gene expression data

The paper presents a new approach to interrelated two-way clustering of gene expression data. Clustering of genes has been effected using entropy and a correlation measure, whereas the samples have been clustered using the fuzzy C-means. The efficiency of this approach has been tested on two well known data sets: the colon cancer data set and the leukemia data set. Using this approach, we were able to identify the important co-regulated genes and group the samples efficiently at the same time.     

虚拟团队关键成功因素模型构建与实证研究

在对虚拟团队相关文献深入检索与分析的基础上,归纳、提炼出影响虚拟团队成功的15项关键因素,构建了虚拟团队关键成功因素三维(目标、成员、沟通)模型假设;通过对国内12家IT企业的问卷调查,收集到242条有效数据;利用描述性统计分析对15项关键因素进行了验证,利用R型因子聚类分析对三维模型假设进行验证,结果表明15项关键成功因素体现在目标一致性、信息技术能力、成员素质、领导能力和沟通协调能力五个维度上;最后,从这五个方面出发,给出了提升虚拟团队绩效的针对性策略.     

我国人口转变地区差异及其与社会经济发展的相关分析

我国的人口转变已经完成 ,但是地区差异颇大。通过对各省份 1949— 1999年人口自然变动系列资料的聚类分析 ,可以把我国的人口转变类型划分为都市、东部、中部、西部和西藏 5种模式 ,各地区人口转变过程及其特点与其社会经济发展水平高度相关     

Monitoring point patterns for the development of space–time clusters

Existing statistical methods for the detection of space–time clusters of point events are retrospective, in that they are used to ascertain whether space–time clustering exists among a fixed number of past events. In contrast, prospective methods treat a series of observations sequentially, with the aim of detecting quickly any changes that occur in the series. In this paper, cumulative sum methods of monitoring are adapted for use with Knox's space–time statistic. The result is a procedure for the rapid detection of any emergent space–time interactions for a set of sequentially monitored point events. The approach relies on a 'local' Knox statistic that is useful in retrospective analyses to detect when and where space–time interaction occurs. The distribution of the local Knox statistic under the null hypothesis of no space–time interaction is derived. The retrospective local statistic and the prospective cumulative sum monitoring method are illustrated by using previously published data on Burkitt's lymphoma in Uganda.     

A fuzzy clustering approach to evaluate individual competencies from REFLEX data

We empirically illustrate how concepts and methods involved in a grade of membership (GoM) analysis can be used to sort individuals by competence. Our study relies on a data set compiled from the international survey on higher education graduates called REFLEX. We focus on the subset of data related to the perception of own competencies. It is first decomposed into fuzzy clusters that form a hierarchical fuzzy partition. Then, we calculate a scalar measure of competencies for each fuzzy cluster, and subsequently use the individual GoM scores to combine cluster-based competencies to position individuals on a scale from 0 to 1.