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Exploiting Hierarchy in Text Categorization 总被引：4，自引：3，他引：1
With the recent dramatic increase in electronic access to documents, text categorization—the task of assigning topics to a given document—has moved to the center of the information sciences and knowledge management. This article uses the structure that is present in the semantic space of topics in order to improve performance in text categorization: according to their meaning, topics can be grouped together into meta-topics, e.g., gold, silver, and copper are all metals. The proposed architecture matches the hierarchical structure of the topic space, as opposed to a flat model that ignores the structure. It accommodates both single and multiple topic assignments for each document. Its probabilistic interpretation allows its predictions to be combined in a principled way with information from other sources. The first level of the architecture predicts the probabilities of the meta-topic groups. This allows the individual models for each topic on the second level to focus on finer discriminations within the group. Evaluating the performance of a two-level implementation on the Reuters-22173 testbed of newswire articles shows the most significant improvement for rare classes. 相似文献
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Henk Erik Meier Till Utesch Charlotte Raue Christina Uhlenbrock Nabila Chababi Bernd Strauss 《Sport in Society》2019,22(3):476-498
It is commonly assumed that sport plays an important role for national identity. However, empirical research has primarily focused on sport’s role for emotional-affectice rather than cognitive aspects of national identity. Therefore, research presented here explores whether identification with the German national soccer team serves to reinforce ethnic or civic conceptions of national identity. Analyses of a unique dataset conducted during the 2014 FIFA World Cup and the 2016?EURO show that national team identification is an important determinant of national pride and national belonging. Respondents who identify with the national soccer team can adhere to different conceptions of national identity. It seems that national pride and affection as well as conceptions of national identity represent stable attitudes not affected by the success of the national team. Further research should improve conceptual clarity and measurement. 相似文献
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Swedish higher education institutions havebeen given increased autonomy to organise theirinternal affairs, raising numerous demands onleadership and governance. Changes are so profoundthat institutions wanting to create an`entrepreneurial response' through a newdecision-making structure must undergo a culturerevolution, threatening existing power structures. Three organising principles are used to describe andanalyse Göteborg University. One conclusion isthat collegial decision-making bodies shouldsimultaneously be redefined, reestablished andabolished, depending on the issues dealt with.Commissions as deans and department heads must beclear and accountable to superiors or tonon-sub-optimising boards in a balanced powerstructure. 相似文献
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