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1.
Anne Harris Cohn 《Child abuse & neglect》1979,3(2):491-496
Not all child abuse is preventable. Society faces an ongoing need to support programs that treat the members of families in which abuse occurs. There is little systeamatically generated knowledge on the most efficient and effective ways to assist parents and children faced with abuse. The purpose of our 40-month study of eleven child abuse and neglect demonstration service programs in the United States was to expand the knowledge base in this area by determining, through evaluative research, the essential elements of successful treatment programs. This paper highlights our findings that pertain to more effective delivery of services to abusive and neglectful parents. 相似文献
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Ellen G. Cohn David P. Farrington Amaia Iratzoqui 《Journal of Criminal Justice Education》2017,28(1):25-51
Cohn and Farrington’s work in citation analysis has examined scholarly influence within criminological research for over 25 years. The current analysis tracks the ten most-cited scholars and each scholar’s most-cited works in four international criminology journals and six American criminology and criminal justice journals over twenty-five years and five time periods—1986–1990, 1991–1995, 1996–2000, 2001–2005, and 2006–2010. This approach extends the traditional approach to citation analysis by documenting increases and decreases in individual citation careers as well as in the most-cited scholarly contributions of the most-cited scholars during a period of significant growth in criminology. The most-cited works mostly fall within the areas of developmental and life-course criminology and criminal careers, reflecting the importance of these topics in criminology. 相似文献
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Tree-structured vector quantization (VQ) is a technique designed to represent a codebook that simplifies encoding as well as vector quantizer design. Most design algorithms for tree-structured VQ used in the past are based on heuristics that successively partition the input space. Recently, Chou, Lookabaugh and Gray proposed a tree-pruning heuristic in which a given initial tree is pruned backwards according to certain optimization criterion. We define the notion of an optimal pruned tree subject to a cost constraint and study the computational complexity of finding such an optimal tree for various cost functions. Under the assumption that all trees are equally probable, we show that, on the average, the number of pruned trees in a given tree is exponential in the number of leaves. Furthermore, we prove that finding an optimal pruned tree subject to constraints such as entropy or the expected-depth is NP-hard. However, we show that when the constraint is the number of leaves, the problem can be solved in polynomial time. We develop an algorithm to find the optimal pruned tree in O(nk) time, where n is the size of the initial tree and kis the constraint size. 相似文献
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Libraries must continually adapt to meet the ever-changing needs of users. Doing so requires the ability to be flexible and respond quickly. This is a case study of how The George Washington University Libraries rethought its approach to collection development using a cross-functional, team-based strategy that leveraged the benefits of Agile project management. Adopting an Agile approach to collection development maximized the impact of the library’s financial resources and enabled staff to develop new skills. This project underscores the value of collaboration, agility, and experimentation in libraries. 相似文献
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Ellen G. Cohn David P. Farrington Jonathan R. Sorensen 《Journal of Criminal Justice Education》2013,24(1):35-49
This article assesses the quality of 12 American doctoral programs by counting the number of publications of their Ph.D. graduates in a large number of criminology and criminal justice journals, and in 20 more “academic” journals. While half of the Ph.D. graduates had no publications, the 4 percent who were the most productive (the “stars”) accounted for one third of all journal articles. Publication rates up to graduation predicted publication rates after graduation. The University of Maryland, Michigan State University, the University of California at Irvine, Florida State University, and Sam Houston State University had the most productive Ph.D. graduates in academic journals. There was a significant correlation between the productivity of a program's Ph.D. graduates and the productivity of its faculty members. The academic publication rate was influenced most by prevalence (the percentage of Ph.D.s with at least one publication), rather than by the percentage of “stars” or the frequency of publications. 相似文献
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