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21.
Vertex betweenness centrality is a metric that seeks to quantify a sense of the importance of a vertex in a network in terms of its ‘control’ on the flow of information along geodesic paths throughout the network. Two natural ways to extend vertex betweenness centrality to sets of vertices are (i) in terms of geodesic paths that pass through at least one of the vertices in the set, and (ii) in terms of geodesic paths that pass through all vertices in the set. The former was introduced by Everett and Borgatti [Everett, M., Borgatti, S., 1999. The centrality of groups and classes. Journal of Mathematical Sociology 23 (3), 181–201], and called group betweenness centrality. The latter, which we call co-betweenness centrality here, has not been considered formally in the literature until now, to the best of our knowledge. In this paper, we show that these two notions of centrality are in fact intimately related and, furthermore, that this relationship may be exploited to obtain deeper insight into both. In particular, we provide an expansion for group betweenness in terms of increasingly higher orders of co-betweenness, in a manner analogous to the Taylor series expansion of a mathematical function in calculus. We then demonstrate the utility of this expansion by using it to construct analytic lower and upper bounds for group betweenness that involve only simple combinations of (i) the betweenness of individual vertices in the group, and (ii) the co-betweenness of pairs of these vertices. Accordingly, we argue that the latter quantity, i.e., pairwise co-betweenness, is itself a fundamental quantity of some independent interest, and we present a computationally efficient algorithm for its calculation, which extends the algorithm of Brandes [Brandes, U., 2001. A faster algorithm for betweenness centrality. Journal of Mathematical Sociology 25, 163] in a natural manner. Applications are provided throughout, using a handful of different communication networks, which serve to illustrate the way in which our mathematical contributions allow for insight to be gained into the interaction of network structure, coalitions, and information flow in social networks. 相似文献
22.
This study reports a meta-analysis of 75 estimates of the efficiency-wage effect. It reveals a strong efficiency-wage effect
that depends upon whether researchers control for potential simultaneity between wages and productivity. Studies that control
for simultaneity tend to report stronger effects. Clear evidence of publication selection is also found. E24, J30.
相似文献
T. D. Stanley (Corresponding author)Email: |
23.
Marginal regions have been the subject of political concern and remedial action in western states for several decades now. The West Coast of the South Island of New Zealand is an interesting case study in this regard, for recent economic growth has confounded earlier expectations of post-restructuring decline, while also contradicting several of the nostrums of new regionalism. In an effort to understand this trajectory, this paper draws on documents from public and private sector organisations, newspaper articles and field visits to examine developments in four key sectors of the West Coast's economy: mining, dairy farming, forestry and tourism. Economic growth is found to be closely linked to the cultivation of new markets for primary products, but efforts to rework the cultural dimensions of marginality have also been important. Value has been added to specific products through the insertion of references to the region's alpine and forested landscapes. Isolation and peripherality have been recast in more positive terms, echoing the broader reframing of New Zealand as a scenic, unspoiled destination. In adopting a cultural economic perspective on marginal regions, the paper illustrates the significance of symbolic forms of value, the potentially flexible nature of marginality as a discursive category, and the importance of the networks which connect regions to national and international flows of capital and tourists. 相似文献
24.
Alison Salloum Michael L. Sulkowski Erica Sirrine Eric A. Storch 《Child and Adolescent Social Work Journal》2009,26(3):259-273
Anxiety disorders are among the most common psychiatric disorders in children and adolescents. Most empirically supported
treatments (ESTs) for pediatric anxiety disorders include various cognitive-behavioral methods. Although demonstrated efficacious
in controlled and clinic settings, there are barriers to implementing these types of therapies in social work settings due
to beliefs about the usefulness of ESTs in community settings; limitations of treatment manuals; time constraints of implementing
ESTs; fidelity and flexibility of implementing ESTs; and limited training opportunities. This article provides an overview
of ESTs for childhood anxiety disorders, highlighting options for overcoming common barriers to implementing ESTs. Collaborative
multi-method approaches to advance implementation of ESTs in social work practice are suggested. 相似文献
25.
The purpose of the current study was to examine the relationships among discrimination, mental health, and body image in a national sample of transgender adults. Participants (N = 78) identified as transgender, genderqueer, or other gender-non-binary identities and were recruited via a national online survey. Harassment/rejection, work/school, and other discrimination explained 10.4% of the variance in body appreciation, while satisfaction with life, anxiety, self-esteem, and depression explained 60.7%. Within these models, harassment/rejection was inversely associated with body appreciation, while self-esteem and satisfaction with life were positively associated. A series of path models moving from a measurement model to a more parsimonious and excellent-fitting model found that the effect of harassment/rejection on body appreciation was fully mediated by self-esteem and satisfaction with life, resulting in a multiple mediation. 相似文献
26.
27.
In April 2013, all of the major academic publishing houses moved thousands of journal titles to an original hybrid model, under which authors of accepted papers can choose between an expensive open access (OA) track and the traditional track available only to subscribers. This paper argues that authors might now use a publication strategy as a quality signaling device. The imperfect information game between authors and readers presents several types of Perfect Bayesian Equilibria, including a separating equilibrium in which only authors of high-quality papers are driven toward the open access track. The publishing house should choose an open-access publication fee that supports the emergence of the highest return equilibrium. Journal structures will evolve over time according to the journals’ accessibility and quality profiles. 相似文献
28.
Eric Harwit 《Chinese Journal of Communication》2017,10(3):312-327
This article traces the development of the Chinese social media app WeChat from its origins to its current role as a leading communications tool for some 600 million Chinese citizens. It analyzes the ways the small-group oriented app is changing China’s social connections, as it enhances trusted, personal contacts while transforming opportunities for larger online group formation. The article assesses methods the Chinese Government employs to monitor and control WeChat communication, and provides a case-focus study. It also considers the apolitical features, in particular, those related to entertainment and personal social relations, which have made important contributions to WeChat’s great popularity. 相似文献
29.
Eric M. Hanson 《Serials Review》2017,43(3-4):278-281
ABSTRACTIn this interview from March 2017, Kay Teel, metadata librarian for serials and arts resources at the Stanford University Libraries, discusses the issues involved in providing access to serials through an institutional repository. 相似文献
30.
Adults aged 65 and over are a growing population in the United States today. This population is underrepresented in the mental health literature despite the high rates of depression and suicide. Additionally, the newest generation of older individuals is more likely to seek therapy than past generations, furthering the need for mental health professionals to be prepared for treating older individuals. Erikson in Childhood and society, Norton, New York, (1950) describes this time period as being critical in terms of the final identity crisis, integrity versus despair. Integrity is marked by a positive evaluation of the individual’s entire life, less anxiety about death, and a feeling of gaining wisdom. Individuals who do not resolve this crisis can manifest despair in a number of ways, including depression, anger, and regret. This model proposes utilizing Narrative therapy (White in Maps of narrative practice, Norton, New York, 2007) to understand how elderly individuals evaluate their lives in reference to their environment. The model utilizes externalization, unique outcomes, and re-membering conversations to unlock subjugated stories and promote integrity. 相似文献