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Availability evaluation in distributed database systems
No full textA quantitative method is presented for evaluating availability in Distributed Database Systems. The description of the distributed system and of transaction processing is given in terms of a flow graph. System states are repsented by a structure vector. Transitions between states are modeled as a Markov process. Solution techniques are discussed both for the case in which transition rates are independent of the system state and for the case in which they depend on it. Finally, the results for an example are given
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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