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The classification of journal titles into fields or specialties is a problem of practical importance in library and information science. An algorithm is described which accomplishes such a classification using the single-link clustering technique and a novel application of the method of bibliographic coupling. The novelty consists in the use of two-step bibliographic coupling linkages, rather than the usual one-step linkages. This modification of the similarity measure leads to a marked improvement in the performance of single-link clustering in the formation of field or specialty clusters of journals. Results of an experiment using this algorithm are reported which grouped 890 journals into 168 clusters. This scope is an improvement of nearly an order of magnitude over previous journal clustering experiments. The results are evaluated by comparison with an independently derived manual classification of the same journal set. The generally good agreement indicates that this method of journal clustering will have significant practical utility for journal classification.  相似文献   
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The goal of this study was to investigate the timing of online homework completion and its effects on student performance. Data was collected from two large, first-semester general chemistry sections at a southwestern university. Specifically, this study aims to explore the link between when students complete their homework relative to the date the material was covered in lecture and student performance in that class. Topics covered in the study included VSEPR, Lewis structures, and molecular geometry. Performance was measured by different variables, namely in-class clicker scores (short-term) and exam grade (long-term). Students were divided into three groups: students who completed the relevant homework within 2 days after the lecture (before the next lecture), those who completed the homework 2 to 4 days after the lecture, and students who completed the homework more than 4 days after the material was covered in lecture. The study also took into consideration student reasoning abilities, as measured by the Test of Logical Thinking (TOLT), with a focus on at-risk students (low TOLT students). Results showed promising findings for low TOLT students. Instructors can employ results from this study to help their students better utilize the online homework resources.

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Educational technology research and development - The transition from paper-based tests to corresponding computer-administered tests allows for the incorporation of improved interfaces that support...  相似文献   
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穷与富     
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Bunge  Mario 《Science & Education》2003,12(5-6):587-597
The commentators on my target article (Bunge 2003) have pointed out some gapsand controversial points in it. However, we all agree that (a) although the quantum theory is basically correct, its orthodox or Copenhagen interpretation, particularly the claim that quantum events are mind-dependent, is false; and (b) quantons – the referents of the quantum theory – however strange, exist on their own, even if some of their properties depend partially upon their environment. I only differ from some of my commentators on whether the quantum theory has no precursors at all; on whether it can explain everything physical, including the universe as a whole; and on whether the quantum theory of measurement is relevant. In this collective reply I will (a) emphasize the peculiarities of quantons by contrast to classons, while at the same time rejecting the hypothesis of absolute novelty; (b) show why the standard quantum theory of measurement fails to explain how measuring devices work; and (c) state that quantum cosmology, which claims to know the state-vector of the universe, is so far just a fantasy.  相似文献   
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