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In this paper we propose improved variants of the sentence retrieval method TF–ISF (a TF–IDF or Term Frequency–Inverse Document Frequency variant for sentence retrieval). The improvement is achieved by using context consisting of neighboring sentences and at the same time promoting the retrieval of longer sentences. We thoroughly compare new modified TF–ISF methods to the TF–ISF baseline, to an earlier attempt to include context into TF–ISF named tfmix and to a language modeling based method that uses context and promoting retrieval of long sentences named 3MMPDS. Experimental results show that the TF–ISF method can be improved using local context. Results also show that the TF–ISF method can be improved by promoting the retrieval of longer sentences. Finally we show that the best results are achieved when combining both modifications. All new methods (TF–ISF variants) also show statistically significant better results than the other tested methods. 相似文献
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Joseph S. Alen 《Publishing Research Quarterly》1992,8(2):73-78
Reproduction rights organizations, which administer reproduction copyrights collectively, are one of the major implementation
mechanisms for copyright law, on both a national and an international level. The operation of RROs is described, with examples
from Norway, Germany, the United Kingdom, and the United States. The International Federation of Reproduction Rights is discussed,
and future plans for licensing databases are summarized.
This article was adapted from a presentation to Latin American Copyright Specialists at the Library of Congress, Washington,
D.C., May 1991, which was sponsored by the International Copyright Institute of the U.S. Copyright Office and the World Intellectual
Property Organization. 相似文献
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Digital Humanities and Libraries: A Conceptual Model 总被引：1，自引：0，他引：1
Chris Alen Sula 《图书馆管理杂志》2013,53(1):10-26
ABSTRACT Though there has been much discussion of the connection between libraries and digital humanities (on both sides), a general model of the two has not been forthcoming. Such a model would provide librarians with an overview of the diverse work of digital humanities (some of which they may already perform) and help identify pockets of activity through which each side might engage the other. This article surveys the current locations of digital humanities work, presents a cultural informatics model of libraries and the digital humanities, and situates digital humanities work within the user-centered paradigm of library and information science. 相似文献
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