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121.
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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Henry Gleitman 《Learning & behavior》1974,2(1):1-5
A general procedure is described whereby animals may be trained to understand certain instructions posed by the E. Animals trained in this way could then provide the answers to some questions that have often been dismissed as anthropomorphic and untestable, such as: Are conditioned reinforcers sought or avoided because of what they signal or for their own sake? Can animals distinguish between “before” and “after”? Can they recall? Special emphasis is paid to some issues in the learned taste aversion literature. 相似文献
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Using temporal proximity of instructor/course evaluations to critical in-course events, together with psychological set provided via directions, the present investigation sought to assess (1) the appropriateness of within-course time-series analyses for instructor ratings, and (2) the potency of inducing rater perceptions of the rating process as an interactive variable in course evaluations. A 2 × 2 (temporal proximity by psychological set) factorial design used students enrolled in two sections of an undergraduate course in educational psychology as subjects. Using both midterm and final examination time periods as data collection points, the results of this investigation suggested that preexamination instructor/course evaluations tend to be more favorable than postexamination evaluations, and that a specific positive psychological set prior to evaluations tends to produce more favorable evaluations than very general, brief instructions. 相似文献
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Henry Robert Weinstock 《科学教学研究杂志》1966,4(1):45-51
Models have played an important role in the development of the physical sciences. Perhaps their role in educational research will be even more important. 相似文献
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