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We give an overview of results, presented in the form of a poster at CSL03/KGC, about a general study of the notions of rule derivability and admissibility in Hilbert-style proof systems. The basis of our investigation consists in the concept of “abstract Hilbert system”, a framework for Hilbert-style proof systems in which it is abstracted from the syntax of formulas and the operational conten...
Knowledge re nement tools seek to correct faulty knowledge based systems (KBSs). The goal of theKrustWorks project is to provide a source of re nement components from which specialised re nement tools tailored to the needs of a range of KBSs can be built. Central to the toolkit is a set of generic re nement operators and a representation language for KBS rules. The language abstracts those prop...
This paper studies a model of mechanism design when agents’ preferences over transfers need not be quasilinear. In a general model of non-quasilinearity, we characterize dominant strategy incentive compatible mechanisms using a monotonicity property. We also establish a revenue uniqueness result: for every dominant strategy implementable allocation rule, there is a unique payment rule that can ...
the purpose of the present study is to find out whether bilinguals of khuzestan-arab origin or monolinguals of iranian origin code-switch during learning or speaking english and which group is more susceptible to code-switch. to this end, the students of 24 classes from high schools and pre- university centers were screened out, and interviewed and their voices and code-switchings were recorded...
Backward induction is the most widely accepted principle for predicting behavior in dynamic games. In experiments, however, players frequently violate this principle. An alternative is a 2-parameter “dynamic level-k” model, where players choose a rule from a rule hierarchy. The rule hierarchy is iteratively defined such that the level-k rule is a best-response to the level-(k − 1) rule and the ...
Wikipedia-centric Knowledge Bases (KBs) such as YAGO and DBpedia store the hyperlinks between articles in Wikipedia using wikilink relations. While wikilinks are signals of semantic connection between entities, the meaning of such connection is most of the times unknown to KBs, e.g., for 89% of wikilinks in DBpedia no other relation between the entities is known. The task of discovering the exa...
BACKGROUND In mid 2010, the 7-valent pneumococcal conjugate vaccine (PCV7) was replaced by the 13-valent conjugate vaccine (PCV13) for childhood immunization in Italy. Our objective in this study was to obtain a snapshot of pneumococcal carriage frequency, colonizing serotypes, and antibiotic resistance in healthy children in two Italian cities one year after PCV13 was introduced. METHODS Nas...
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