洒风：自虐/露营/腐败

驴路对于洒风来说,最好玩的经历恐怕就是探洞了。洒风说,探洞的刺激在于黑暗、幽闭给人的紧张和恐惧感远远大于人对洞穴奇形怪状风光的好奇心。要克服自身对未知世界的恐惧和种种不安。这是一种挑战,你永远不知道下一步会看见什么,会发现什么,这也正是探洞的魅力所在。     

视窗/关注

1．张伟霞，女，9岁，甘肃省通渭县陇阳中心小学一年级学生，学习刻苦，成绩名列前茅。     

Categorical attribute based centrality: E–I and G–F centrality

In a paper examining informal networks and organizational crisis, Krackhardt and Stern (1988) proposed a measure assessing the extent to which relations in a network were internal to a group as opposed to external. They called their measure the E–I index. The measure is now in wide use and is implemented in standard network packages such as UCINET ( Borgatti et al., 2002). The measure is based on a partition-based degree centrality measure and as such can be extended to other centrality measures and group level data. We explore extensions to closeness, betweenness and eigenvector centrality, and show how to apply the technique to sets of subgroups that do not form a partition. In addition, the extension to betweenness suggests a linkage to the Gould and Fernandez brokerage measures, which we explore.