Purpose-This paper is aimed primarily at academic library managers and acquisition librarians. By analogy with Pareto's study of the relationship between clients and turnover, we will study subscriptions to e-journals and usage statistics. Our purpose is to evaluate the long tail of usage statistics and to compare it with the two modes of subscription, individually selected journals vs. packages (big deals). Design/methodology/approach-The paper exploits usage statistics and subscription data from a national usage study of an academic publisher. Data are from 2010. Findings-Usage statistics are partly shaped by the long tail effect. Individual subscriptions to journals are more selective than big deals, and tend towards a traditional retail model. Unlike subscriptions through packages, usage and individual subscriptions can be related by a similar inclination. But both types of subscriptions fail to predict the popularity of a journal in its usage. Research limitations/implications-The paper uses data from a national usage study and tries to identify global trends. Thus, it does not distinguish between customer categories, disciplines and activity domains. Practical implications-The paper considers the opportunity provided by big deal for acquisition policy. Ready-made big deals sometimes appear as an unbounded and excessive supply not suited to the users' true and sufficient needs, while selective acquisition policy cannot completely anticipate online usage behaviour. Originality/value-Only a few studies distinguish Pareto from long tail distributions in usage statistics, and there is little empirical evidence as to the impact of selected subscriptions vs. big deals on these statistics.
Simulators for dynamic systems are now widely used in various application areas and raise the need for effective and accurate flow visualization techniques. Animation allows us to depict direction, orientation, and velocity of a vector field accurately. This paper extends a former proposal for a new approach to produce perfectly cyclic and variable-speed animations for 2D steady vector fields (see [1] and [2]). A complete animation of an arbitrary number of frames is encoded in a single image. The animation can be played using the color table animation technique, which is very effective even on low-end workstations. A cyclic set of textures can be produced as well and then encoded in a common animation format or used for texture mapping on 3D objects. As compared to other approaches, the method presented in this paper produces smoother animations and is more effective, both in memory requirements to store the animation, and in computation time.
International audiencePurpose– The paper of this paper is to explore the usage patterns of e-journals in French business schools.Design/methodology/approach– The paper exploits COUNTER-compliant usage statistics from a nationwide usage study with data from journal collections of an international academic publisher.Findings– With regard to online collections, the usage appears to be relatively intensive, especially when compared to usage statistics from universities in the same fields. This result may reflect an emerging research activity in business schools and a projected and required international orientation. However, the study also reveals important differences between schools, a fact that should not be overestimated because of the small sample size, even if the sample is a representative of French business schools.Research limitations/implications– The paper uses empirical data from a national usage study to identify specific patterns in business schools. It does not integrate qualitative survey data or deep log file analysis.Originality/value– Very few studies provide empirical evidence of e-journal usage in business schools. The paper enhances the knowledge on usage in specific environments in higher education. This is the first usage study with French business schools
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