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A comparison of bibliometric indicators for computer science scholars and journals on Web of Science and Google Scholar 总被引:1,自引:0,他引:1
Massimo Franceschet 《Scientometrics》2010,83(1):243-258
Given the current availability of different bibliometric indicators and of production and citation data sources, the following two questions immediately arise: do the indicators’ scores differ when computed on different data sources? More importantly, do the indicator-based rankings significantly change when computed on different data sources? We provide a case study for computer science scholars and journals evaluated on Web of Science and Google Scholar databases. The study concludes that Google scholar computes significantly higher indicators’ scores than Web of Science. Nevertheless, citation-based rankings of both scholars and journals do not significantly change when compiled on the two data sources, while rankings based on the h index show a moderate degree of variation. 相似文献
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Scientometrics - Citation impact is commonly assessed using direct, first-order citation relations. We consider here instead the indirect influence of publications on new publications via... 相似文献
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Massimo Franceschet Angelo Montanari Maarten de Rijke 《Automated Software Engineering》2004,11(3):289-321
In this paper, we develop model checking procedures for three ways of combining (temporal) logics: temporalization, independent combination, and join. We prove that they are terminating, sound, and complete, we analyze their computational complexity, and we report on experiments with implementations. We take a close look at mobile systems and show how the proposed combined model checking framework can be successfully applied to the specification and verification of their properties. 相似文献
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Iliano Cervesato Massimo Franceschet Angelo Montanari 《Computational Intelligence》2000,16(2):307-347
Kowalski and Sergot's Event Calculus (EC) is a simple temporal formalism that, given a set of event occurrences, derives the maximal validity intervals (MVIs) over which properties initiated or terminated by these events hold. In this paper, we conduct a systematic analysis of EC by which we gain a better understanding of this formalism and determine ways of augmenting its expressive power. The keystone of this endeavor is the definition of an extendible formal specification of its functionalities. This formalization has the effects of casting determination of MVIs as a model checking problem, of setting the ground for studying and comparing the expressiveness and complexity of various extensions of EC, and of establishing a semantic reference against which to verify the soundness and completeness of implementations. We extend the range of queries accepted by EC, which is limited to Boolean combinations of MVI verification or computation requests, to support arbitrary quantification over events and modal queries. We also admit specifications based on preconditions. We demonstrate the added expressive power by encoding a number of diagnosis problems. Moreover, we provide a systematic comparison of the expressiveness and complexity of the various extended event calculi against each other. Finally, we propose a declarative encoding of these enriched event calculi in the logic programming language λProlog and prove the soundness and completeness of the resulting logic programs. 相似文献
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In this paper, we show how well-known graph-theoretic techniques can be successfully exploited to efficiently reason about
partially ordered events in Kowalski and Sergot's Event Calculus and in its skeptical and credulous modal variants. To overcome
the computational weakness of the traditional generate-and-test algorithm of (Modal) Event Calculus, we propose two alternative
graph-traversal algorithms that operate on the underlying directed acyclic graph of events representing ordering information.
The first algorithm pairs breadth-first and depth-first visits of such an event graph in a suitable way, while the second
one operates on its transitive closure and reduction. We prove the soundness and completeness of both algorithms, and thoroughly
analyze and compare their computational complexity.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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Representing and Reasoning about Temporal Granularities 总被引:4,自引:0,他引:4
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Balder?ten?CateEmail author Massimo?Franceschet 《Journal of Logic, Language and Information》2005,14(3):281-288
We prove ExpTime-membership of the satisfiability problem for loosely ∀-guarded first-order formulas with a bounded number of variables and an unbounded number of constants. Guarded fragments with constants are interesting by themselves and because of their connection to hybrid logic. 相似文献
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