1,721,101 research outputs found
Coding by minimal linear grammars
Full text linkThis paper concerns the structure and the properties of a special class of combinatorial systems called minimal linear grammars. The role of unambiguous minimal linear grammars is investigated in the framework of the information transmission and coding problem and some related issues
A methodology to measure the acoustic performance of access floors
No full textThe European standard EN ISO 140-12:2000 gives a methodology to measure the acoustic performance of access floors in terms of both airborne and impact sound insulation.
Access floors are often used in office buildings and working environments as they create a hollow space below the floor surface for network cabling and electrical wiring: in this way they are useful from the functional (ease of inspection, repair and changing of system elements), the aesthetic (no exposed wires and elements) and acoustic point of view.
This paper presents the measurement procedures used at the Acoustic Laboratory of the University of Perugia – Italy, in order to perform the tests defined by the EN ISO 140-12.
The standard requires the measurement of two parameters, Ln,f e Dn,f , that qualify respectively the airborne and the impact sound insulation trough an access floor, and the calculation of the two corresponding single number indexes Ln,f,W e Dn,f,W.
A sample of access floor has been tested in the purposely prepared reverberating rooms of the Laboratory, with and without covering.
Particular attention has been paid to test rooms set up and to sample installation because of the complexity of these phases
Locally strongly transitive automata in the Černý conjecture and related problems
No full textThis paper mainly concerns the property of strong local transitivity of finite automata. We will survey some results on this property in the context of the synchronization problem. Further aspects and results relating this problem with the Road coloring problem of finite directed graphs and the Restivo conjecture on the minimal length of an incompletable word of a finite language, are also analyzed
A non-commutativity statement for algebraic quaternions
No full textWe prove a constructive version of Tits' alternative for groups of quaternions with algebraic coefficients by bounding valuations of their entries considered as elements of a fraction field of an opportunely chosen Dedekind domain. © World Scientific Publishing Company
On the commutative equivalence of bounded context-free and regular languages: Thesemi-linear case
No full text
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
The KSTE + I approach and the advent of AI technologies: evidence from the European regions
Full text linkIn this paper, we integrate insights from the Knowledge Spillover Theory of Entrepreneurship and Innovation (KSTE + I) with Schumpeter's concept of the entrepreneur as a "factor of disequilibrium". Specifically, we examine whether there is a correlation between the level of Artificial Intelligence (AI) knowledge available in a region and the number of newly established innovative ventures, defined as startups that file patents in any technological field within the same year of their foundation. Empirically, we test for 287 Nuts-2 European regions whether the local AI stock of knowledge exerts an enabling role in fostering innovative entry within AI-related local industries (AI technologies as focused enablers) and within non-AI-related local industries (AI technologies as generalised enablers). Results from fixed-effect regressions using Poisson and Negative Binomial models - while controlling for a range of concurrent drivers of entrepreneurship - indicate that the local stock of AI knowledge fosters the proliferation of innovative startups within AI-related local industries. This finding supports both the KSTE + I framework and the enabling role of AI technologies; however, it does not support the notion of AI technologies as generalised enablers
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