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Result merging methods in distributed information retrieval with overlapping databases 总被引:5,自引:0,他引:5
In distributed information retrieval systems, document overlaps occur frequently among different component databases. This
paper presents an experimental investigation and evaluation of a group of result merging methods including the shadow document
method and the multi-evidence method in the environment of overlapping databases. We assume, with the exception of resultant
document lists (either with rankings or scores), no extra information about retrieval servers and text databases is available,
which is the usual case for many applications on the Internet and the Web.
The experimental results show that the shadow document method and the multi-evidence method are the two best methods when
overlap is high, while Round-robin is the best for low overlap. The experiments also show that [0,1] linear normalization
is a better option than linear regression normalization for result merging in a heterogeneous environment.
相似文献
Sally McCleanEmail: |
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PURPOSE: This paper examines individual, family, and neighborhood level predictors of resilience in adolescence and young adulthood and describes changes in resilience over time from adolescence to young adulthood in abused and neglected children grown up. METHOD: We use documented cases of childhood physical and sexual abuse and neglect (n=676) from a Midwestern county area during the years 1967-1971 and information from official records, census data, psychiatric assessments, and self-reports obtained through 1995. Analyses involve logistic regressions, replicated with Mplus to test for possible contextual effects. RESULTS: Almost half (48%) of the abused and neglected children in adolescence and nearly one-third in young adulthood were resilient. Over half of those who were resilient in adolescence remained resilient in young adulthood, whereas 11% of the non-resilient adolescents were resilient in young adulthood. Females were more likely to be resilient during both time periods. Being white, non-Hispanic decreased and growing up in a stable living situation increased the likelihood of resilience in adolescence, but not in young adulthood. Stressful life events and a supportive partner promoted resilience in young adulthood. Neighborhood advantage did not exert a direct effect on resilience, but moderated the relationship between household stability and resilience in adolescence and between cognitive ability and resilience in young adulthood. CONCLUSIONS: Ecological factors appear to promote or interfere with the emergence and stability of resilience following childhood maltreatment. 相似文献
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J. Bruce Francis Michalina Vaughan Colin Flood Page Sally Tomlinson R. A. Becher Margaret C. Ives John Urry K. G. Collier Meir Zadok Charles Carter Jürgen Schramm Jean Barry Graeme C. Moodie Donald Bligh R. A. King D. G. Mulcahy Peter Scott F. R. Charmer T. R. Bone John A. Hughes Roger Greenhough Alec M. Ross John Wakeford Joyce Skinner Duncan B. Nimmo Cedric Cullingford L. R. B. Elton 《Higher Education》1979,8(6):709-744
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Sally Beveridge 《欧洲特需教育杂志》2013,28(1):3-16
Schools are required to develop policies and practices in line with the principles of both partnership with parents and pupil participation. However, there is increasing recognition of the potential tensions that may exist between these two principles. This paper reports on a study that aimed to explore the question of how schools might develop their home–school relationships in ways that enhance rather than constrain pupil participation. It focuses on the perspectives of children aged 6 to 16 years (with and without special educational needs), parents and teachers concerning children's involvement in decision-making at home and at school, and their participation within the home–school relationship. The findings highlight the need for schools to develop a coherent view of what active participation means for children and a vocabulary to communicate about this not only with pupils and staff across the whole school, but also with parents. They demonstrate that there is scope for two-way support between parents and teachers in relation to the promotion of children's involvement in decision-making both at home and at school. Further, they illustrate the complex and evolving three-way partnership between parent–child–teacher that is central to the home–school relationship. While it is acknowledged that children may rightly wish to keep a distance between aspects of home and school life, it is argued that there is a need for schools to give explicit consideration to the place of pupil participation within the home–school relationship. 相似文献
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David Halpin Marny Dickson Sally Power Geoff Whitty Sharon Gewirtz 《Curriculum Journal》2013,24(3):197-206
The English EAZ experience illustrates the difficulties of developing an innovative, responsive and inclusive curriculum within an evaluative state characterized by high stakes testing. Consequently, while government exhortations to ‘raise standards’, ‘innovate’ and ‘promote social inclusion’ clearly serve an important rhetorical function, they may underestimate the challenges involved and overestimate the capacity of schools within disadvantaged areas to ‘make a difference’. 相似文献
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