基于关系探测聚类的图形自动接边算法

由于现阶段大部分矢量数据都是按照图幅进行管理的,图形接边工作贯穿数据的生产,入库,分发等过程,接边工作的好坏直接决定着数据质量。本文提出了一种基于关系探测聚类的自动接边算法,将地物匹配和合并要素彻底分离开来,有利于接边检查。另外,此算法可以减少更新数据和选择集的次数,提高了程序效率。     

Dependency preserving refinements and the fundamental problem of database design

We introduce a new point of view into database schemes by applying systematically an old logical technique: translation schemes, and their induced formula and structure transformations. This allows us to re-examine the notion of dependency preserving decomposition and its generalization refinement. We demonstrate the usefulness of this approach by recasting the theory of vertical and horizontal decompositions in our terminology. The most important aspect of this approach, however, lies in laying the groundwork for a formulation of the Fundamental Problem of Database Design, namely to exhibit desirable differences between translation equivalent presentations of data and to examine refinements of data presentations in a systematic way. The emphasis in this paper is not on results. The main line of thought is an exploration of the use of an old logical tool in addressing the Fundamental Problem. Translation schemes allow us also to have a new look at normal forms of database schemes and to suggest a new line of search for other normal forms. Illustrating our techniques we show that every scheme specified by functional and inclusion dependencies has a dependency-preserving refinement into BCNF. Furthermore we give a characterization of the embedded implicational dependencies (EID's) using FD's and inclusion dependencies (ID's) and a basic class of refinements consisting of projections and natural joins.     

客户关系管理系统数据仓库的建立

数据仓库建设是一项有挑战性的工作，而客户数据仓库建设除了符合数据仓库建设的一般规律外，还有自己的特点，探讨了客户数据仓库建设过程中要注意的问题。     

聚合度和磺化度对油井水泥外加剂SPS性能的影响

本文测定了室内合成聚苯乙烯磺酸钠（ＳＰＳ）样品处理的Ｇ级水泥浆表现粘度、样品抗盐析能力及在Ｇ级水泥上的吸附量，讨论了ＳＰＳ的聚合度和磺化反对ＳＰＳ在水泥浆中减阻效果的影响。ＳＰＳ样品以废旧聚苯乙烯塑料为原料制备。     

幼年大鼠甲状腺γ线损伤效应的剂量效应关系

１５日龄大鼠甲腺γ线局部单次外照射后６周，观察和测量滤泡和滤泡上皮细胞形态结构的变化，综合分析甲状腺辐射损伤效应。结果表明，幼年大鼠甲状腺具有较高的辐射敏感性，０．５Ｇｙ照后即可出现显著性变化。通过实验得出了一些形态计量学指标变化与照射剂量之间的定量关系。     

苜蓿黄酮的分离及其生物转化研究进展

苜蓿属植物资源丰富,并且含有大量的黄酮类物质。黄酮类物质具有多种生物活性及药理作用。本文对苜蓿黄酮的分离、结构鉴定以及黄酮苷的生物转化的最新进展等进行了总结,并对苜蓿黄酮的发展方向进行了探讨。     

Looking at both sides of relationship dynamics in virtual communities: A social exchange theoretical lens

This study draws on social exchange theory to investigate the relationship dynamics of the member–community dyad in virtual community settings. Using a longitudinal design and multiple measurement sources, the findings indicate that social and task communication styles have unique effects on members’ community commitment velocity, which in turn influences member gratitude and entitlement behaviors. A moderated path analysis demonstrates that the effects of social and task communication styles on community commitment velocity are both positively moderated by attachment anxiety and attachment avoidance. It also reveals that members’ level of popularity augments the influence of community commitment velocity on member entitlement behavior.     

网上营销战略初探

网上营销是企业市场营销的发展趋势,网络互动的特性使得网上营销与传统营销有很大的差异,因此需要根据网上营销的特点制定和实施网上营销战略。本文说明网上营销战略的核心是增进企业与客户之间的关系实施“软营销”。     

Understanding the interplay of social commerce affordances and swift guanxi: An empirical study

Prior studies highlight consumer behavior in social commerce from the perspective of relational exchange, while culture-driven aspects have been neglected. Given cultural uniqueness in China, this study develops a research model to explore the effects of key social commerce affordances on swift guanxi dimensions and subsequent purchase intention. Data from 450 agricultural product consumers in social commerce were used in PLS analysis for testing the proposed research model. The results indicate that interactivity, stickiness, and word of mouth exert positive effects on mutual understanding, reciprocal favor, and relationship harmony, to various degrees. In turn, swift guanxi dimensions are determinants of consumers’ purchase intention in social commerce.     

对社区建设与社区就业问题的思考

社会和谐的支柱是社区建设,社区建设的主要工作就是社区就业。就业是民生之本,涉及到千家万户,是社区建设的根本之所在。高度关注社区就业问题,创建最充分的就业社区,是实现社区和谐的必由之路。