Paul B Tefko Kantor

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In assessing information retrieval systems, it is important t o know not only the precision of the retrieved set, but also to compare the number of retrieved relevant items to the total number of relevant items. For large collections, such as the TREC test collections, or the World Wide Web, it is not possible to enumerate the entire set of relevant(More)
Project sought to understand both user reactions to online books in the scholarly world and the cost profiles of print and online books. Scholars appreciated the opportunity to use the online format to locate a book and to browse it. However, they sought a print copy for extended reading. Incremental costs of online books are small for publishers.(More)
A study of ninety-five health sciences libraries, obtaining nearly 24,000 user responses, provides estimates of the national cost of library services through the three principal services of circulation, reference, and in-house use; and for four types of users: persons interested in patient care, those interested in research, those involved in education, and(More)
Social media represent a powerful new tool for peer-to-peer communication and collaboration. Recent events – like the Moscow airport bombing (Anon, n.d.) – have shown that sometimes the information posted to social media like Twitter and Facebook by ordinary people at the scene of emergencies can be the best and most rapid source of information about those(More)
A game in which one player makes unitary transformations of a simple system, and another seeks to confound the resulting state by a randomly chosen action is analyzed carefully. It is shown that the second player can reduce any system to a completely random one by rotation through an angle of 120 degrees, about an axis chosen at random. If, on the other(More)