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We deal with a random graph model where at each step, a vertex is chosen uniformly at random, and it is either duplicated or its edges are deleted. Duplication has a given probability. We analyze the limit distribution of the degree of a fixed vertex and derive a.s. asymptotic bounds for the maximal degree. The model shows a phase transition phenomenon with respect to the probabilities of duplication and deletion. 相似文献
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Mirroring national trends, children of color in Washington state's King County are overrepresented at every point in the child welfare system and fare worse by most measures than are Caucasian children. The King County Coalition on Racial Disproportionality was formed to reduce and ultimately eliminate racial disproportionality in the county's child welfare system. The research-based strategies implemented to address the issue focused on children in care longer than two years. They included participation in the Breakthrough Series Collaborative on Racial Disproportionality, implementation of benchmark hearings, and development of Champions for Permanence. Now in the beginning stages, perhaps the most significant success is heightened awareness within the community of the disparate outcomes for children of color in the child welfare system. 相似文献
154.
Who is it That Would Make Business Schools More Critical? Critical Reflections on Critical Management Studies 总被引:1,自引:1,他引:0
We suggest in this paper that whilst exploring how to make business schools more critical we must also turn a critical and reflexive lens upon ourselves, critical management thinkers. Our endeavour is outlined here as a 'reflexive journey' in which we turn upon ourselves, academics who identify as 'critical' thinkers, the theories we use to analyse others. Our focus is upon critical management education. We use three vignettes drawn from our previous research. One is of graduands from the postgraduate programmes on which two of us teach, the second an analysis of knowledge transfer programmes in which we have participated, and the third a study of the construction of academic identities. The first study shows the academic teacher may become an internalized, judgemental gaze, the second that what we see as a critical approach may be construed by our students as another 'truth' that fails to encompass the complexities of organizations and management, and the third encourages us to ask some questions about our own positions. This causes us to ask some uncomfortable questions about our own positions as critical management scholars and the ways in which we conceptualize business schools and our colleagues who work in them. 相似文献
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Vicky C. W. Tam 《Children & Society》2001,15(3):181-192
This study examines the views on and use of day care for young children among white‐collar working women from a family ecological perspective. Discrepancies between perceived ideal and actual choice of child care were observed. Care provided by family kin was an ideal used with reservation, the employment of foreign domestic helpers was a reluctant choice, while the use of formal care was largely unexplored. The findings of this study demonstrate how individual families' child‐rearing goals are supported and constrained by contextual factors within the ecology. Implications for policies on child care in Hong Kong are discussed. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
160.
The question of how to measure and classify people’s risk preferences is of substantial importance in the field of economics. Inspired by the multitude of ways used to elicit risk preferences, we conduct a holistic investigation of the most prevalent method, the multiple price list (MPL) and its derivations. In our experiment, we find that revealed preferences differ under various versions of MPLs as well as yield unstable results within a 30-minute time frame. We determine the most stable elicitation method with the highest forecast accuracy by using multiple measures of within-method consistency and by using behavior in two economically relevant games as benchmarks. A derivation of the well-known method by Holt and Laury (American Economic Review 92(5):1644–1655, 2002), where the highest payoff is varied instead of probabilities, emerges as the best MPL method in both dimensions. As we pinpoint each MPL characteristic’s effect on the revealed preference and its consistency, our results have implications for preference elicitation procedures in general. 相似文献