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The need to cluster small text corpora composed of a few hundreds of short texts rises in various applications; e.g., clustering top-retrieved documents based on their snippets. This clustering task is challenging due to the vocabulary mismatch between short texts and the insufficient corpus-based statistics (e.g., term co-occurrence statistics) due to the corpus size. We address this clustering challenge using a framework that utilizes a set of external knowledge resources that provide information about term relations. Specifically, we use information induced from the resources to estimate similarity between terms and produce term clusters. We also utilize the resources to expand the vocabulary used in the given corpus and thus enhance term clustering. We then project the texts in the corpus onto the term clusters to cluster the texts. We evaluate various instantiations of the proposed framework by varying the term clustering method used, the approach of projecting the texts onto the term clusters, and the way of applying external knowledge resources. Extensive empirical evaluation demonstrates the merits of our approach with respect to applying clustering algorithms directly on the text corpus, and using state-of-the-art co-clustering and topic modeling methods. 相似文献
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Nili Steinberg Gordon Waddington Roger Adams Janet Karin Rezaul Begg Oren Tirosh 《Journal of sports sciences》2016,34(15):1430-1437
With the aim of determining both the acute and the chronic effects of textured insoles on the ankle discrimination and performance ability of dancers, 60 ballet dancers from the Australian Ballet School, aged 14–19 years, were divided into three groups (two intervention groups and a control group), age- and level-matched. In the first 5 weeks (weeks 1 to 5), the first intervention group (GRP1) was asked to wear textured insoles in their ballet shoes and the second intervention group (GRP2) was not given textured insoles to wear. In the next 5 weeks (weeks 6 to 10), GRP2 was asked to wear the same type of textured insoles and GRP1 did not wear the textured insoles. The control group (CTRL) did not wear textured insoles during the whole 10 weeks. All participants were tested preintervention, after 5 weeks and after 10 weeks for ankle discrimination score (AUC scores). Dance performance was assessed by 5–7 dance teachers. Pre-to-post change in AUC scores was significantly greater for the groups wearing insoles than for the controls (P = .046) and the size of pre-to-post changes did not differ between the two intervention groups (P = .834). Significant correlation was found between ankle discrimination score and performance scores, using the textured insoles (r = .412; P = .024). In conclusion, the stimulation to the proprioceptive system arising from textured insoles worn for five weeks was sufficient to improve the proprioceptive ability and performance ability of ballet dancers. 相似文献
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Authoritarianism, perceived threat and exclusionism on the eve of the Disengagement: Evidence from Gaza 总被引：1，自引：0，他引：1
Canetti D Halperin E Hobfoll SE Shapira O Hirsch-Hoefler S 《Int J Intercult Relat》2009,33(6):463-474
Major political events such as terrorist attacks and forced relocation of citizens may have an immediate effect on attitudes towards ethnic minorities associated with these events. The psychological process that leads to political exclusionism of minority groups was examined using a field study among Israeli settlers in Gaza days prior to the Disengagement Plan adopted by the Israeli government on June 6, 2004 and enacted in August 2005. Lending credence to integrated threat theory and to theory on authoritarianism, our analyses show that the positive effect of religiosity on political exclusionism results from the two-staged mediation of authoritarianism and perceived threat. We conclude that religiosity fosters authoritarianism, which in turn tends to move people towards exclusionism both directly and through the mediation of perceived threat. 相似文献
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The growing number of ‘smart’ instruments, those equipped with AI, has raised concerns because these instruments make autonomous decisions; that is, they act beyond the guidelines provided them by programmers. Hence, the question the makers and users of smart instrument (e.g., driver-less cars) face is how to ensure that these instruments will not engage in unethical conduct (not to be conflated with illegal conduct). The article suggests that to proceed we need a new kind of AI program—oversight programs—that will monitor, audit, and hold operational AI programs accountable. 相似文献
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Studies in laboratory animals have shown that the extinction of a conditioned stimulus, A, is regulated by the associative history of a second stimulus, X, when the two are extinguished in simultaneous compound: An inhibitory X protects A from extinction (Rescorla Learning & Behavior, 31, 124–132, 2003), whereas an excitatory X facilitates, and under some circumstances deepens, the extinction of A (Rescorla Journal of Experimental Psychology: Animal Behavior Processes, 26, 251–260, 2000, Journal of Experimental Psychology: Animal Behavior Processes, 32, 135–144, 2006). In the present study, we used the allergist task to examine whether the extinction of causal judgments in people is similarly regulated by the causal status of co-present stimuli. Experiment 1 showed that a cue trained as a conditioned inhibitor protected a target cue from extinction: The target extinguished in compound with the inhibitor was rated as being more causal of the outcome than was a target extinguished in compound with a control cue lacking inhibitory properties. In contrast, the remaining experiments showed that the extinction of a target cue was regulated by the presence, but not the causal status, of a partner cue: Target cues extinguished in compound were protected from extinction, and no evidence showed that an already extinguished partner conferred more protection (Exp. 2), or that an excitatory partner conferred any less protection (Exps. 2 and 3), or that an excitatory partner deepened the extinction of its already extinguished target. These findings are inconsistent with elemental models that rely on a common error term to explain associative changes in extinction. They are largely, but not completely, consistent with the configural model proposed by Pearce (Psychological Review, 94, 61–73, 1987), which predicts an ordering of levels of protection that was not observed. 相似文献
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This article considers the implementation of the life history approach in the study of media professionals, based on an analysis of the occupational life histories of 77 active and former Israeli journalists. The article first discusses the decisions made throughout execution of the project. Next, it explores three key features of the dynamics of life history interviewing. Finally, the article examines the ways in which data gathered through life history interviews can be generalized. 相似文献
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In three human causal learning experiments, we examined attentional modulation in the blocking task, in which participants
typically learn little about a novel cue B when it is paired with a previously trained, predictive cue A. Evidence indicates
that this blocking training led to a decrement in attention to the blocked cue B. The present experiments addressed whether
this decrease in attention to the blocked cue could be better explained as being due to lateral inhibition from the pretrained
cue A to the blocked cue B, or as a cue-specific property that is not conditional on the presence or absence of other stimuli.
Strong effects of learned predictiveness were observed on participants’ causal judgments (Experiment 1) and choice behavior
(Experiments 2 and 3). However, no evidence for lateral inhibitory processes emerged in any of the experiments, despite explicit
attempts to maximize experimental sensitivity to this effect. The results are discussed in the context of formal models of
the operation of attentional processes in human and animal learning. 相似文献
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Despite ongoing efforts to promote ethnic, racial and socio-economic integration, segregation continues to challenge education administrators and legal scholars. Privileged parents seeking to avoid integration employ various strategies such as attending private schools or buying houses in neighbourhoods with good school. This paper offers a combined empirical and legal research of another such strategy: the resort to religious schools. The research is conducted within one specific context, that of Israeli Religious State Schools. The empirical study examines whether “Torani” religious state schools (a category of religious schools that offer enhanced Jewish studies and a strict religious environment) induce socio-economic segregation. The findings indicate that “Torani” schools are indeed socio-economically segregated and serve children from higher socioeconomic class than regular religious state schools. It also shows that “Torani” schools are less reflective of their surroundings than regular religious state schools, and are more likely to be established by privileged parents in poor areas, where they are dissatisfied with the local state schools. The legal research offers an explanation of how legal regulation can determine whether religious schools will become a means for avoiding integration. Specifically, it points to three areas in which “Torani” schools are regulated differently than regular religious state schools – the rules regarding the establishment of new schools; the rules concerning school funding; and the rules concerning student enrolment – and argues that special treatment meant to protect religious interests is responsible for making “Torani” schools socially segregated. 相似文献
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In three experiments, we used the allergist task to examine the role of error correction mechanisms in the acquisition and extinction of causal judgments in people. Consistent with existing human and animal studies, acquisition of causal judgments was influenced by the discrepancy between the allergenic outcome and that predicted by all of the cues present on a trial (the "common error" term). However, in the present experiments, we failed to detect any evidence for the use of a common error term in extinction learning: Judgments of the allergenic properties of a cue were unaffected by the predictive value of the other cues present on a trial. This asymmetry in the use of a common error term in acquisition and extinction learning is inconsistent with previous animal studies and also with most models of associative learning. However, approaches that allow learning to be specific to a particular arrangement of elemental cues (context specific and state based) offer some explanation of the observed asymmetry. 相似文献