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Manfred Kochen 《Information processing & management》1981,17(5):291-299
Libraries and publishers have evolved together. Publishers rely on libraries as a minimum market for their scholarly products. Inflationary pressures have caused publishers to increase prices that, in turn, strain library budgets that have not increased as fast, and which, in turn, undermine the minimal demand publishers can count on, adding to inflationary pressure.A simple mathematical model for the dynamics of the interaction between libraries and publishers is analyzed. It derives a function for the supply curve of scholarly publications, and is used to estimate when an institution will have to spend as much per person on library support as on his or her salary if present trends continue. This is used to argue that present trends are unlikely to continue, but that a discontinuous shift in the production of scholarly output is likely to occur within a decade or two. Likely new forms of communication among scholars in “communicating classes” involving nearly simultaneous communication and a new kind of organized cumulative record are discussed. The implication for institutional changes not only in libraries and publishers and their interrelation but of new kinds of institutions are sketched. 相似文献
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In more recent times, health-related quality of life (HRQOL) measurements have formed an important part of assessing the quality
of routine care in general practice. For a measure to have clinical usefulness it must not only be valid, appropriate, reliable,
responsive, and capable of being interpreted, but it must also be simple, fast to complete, easy to score, and provide useful
clinical data. The Two-step method of choosing appropriate measures is introduced. Then through comparison of generic instruments
with disease-specific instruments, we can conclude that sometimes a combination of generic and disease-specific HRQOL measures
may be more appropriate for monitoring changes in a patient's health status due to an intervention. 相似文献
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When mathematics is used to help people cope with real-life situations, a three-stage intellectual process is involved. First, a person becomes aware of a problem-situation which stimulates him to generate a problem-statement, a verbal story-problem. This may be in writing, expressed orally, or merely thought and evidenced by other behavior. Second, he transforms the verbal problem-statement into a mathematical formulation. Third, he analyzes this mathematically stated problem into subproblems to which the solution is more immediate.We propose an operational instrument for assessing how a person moves from the first to the second and third stage. This involves coding questions asked, actions taken, hesitancy and latency. Results of using this procedure in experimental situations were used to determine reliability. We also propose and compare methods for effecting and accelerating motion from the first to the third stage. These involve operant conditioning, need arousal cues, controlled verbal instructions. Experience with one such technique to teach problem-formulation in actual teaching practice is reported.The theoretical basis for these experiments is developed by showing how to program a computer to go through these stages for a reasonably large and interesting class of problem-situations to which mathematics is applicable.This research was partially supported by an Office of Education Grant OEG5-72-0050(509). 相似文献