1,721,026 research outputs found
Cartolina/Postcard
No full textIl contributo esplora il lemma 'cartolina' ed il suo utilizzo nella pratica della progettazione archiettonic
Single Server Retrial Queue with Group Admission of Customers
No full textWe consider a retrial queueing system with a single server and novel customer’s admission discipline. The input
flow is described by a Markov Arrival Process. If an arriving customer meets the server providing the service, it
goes to the orbit and repeats attempts to get service in random time intervals whose duration has exponential
distribution with parameter dependent on the customers number in orbit. Server operates as follows. After a
service completion epoch, customers admission interval starts. Duration of this interval has phase type distribution.
During this interval, primary customers and customers from the orbit are accepted to the pool of customers which
will get service after the admission interval. Capacity of this pool is limited and after the moment when the pool
becomes full before completion of admission interval all arriving customers move to the orbit. After completion
of an admission interval, all customers in the pool are served simultaneously by the server during the time having
phase type distribution depending on the customers number in the pool. Using results known for Asymptotically
Quasi-Toeplitz Markov Chains, we derive stability condition of the system, compute the stationary distribution
of the system states, derive formulas for the main performance measures and numerically show advantages of
the considered customer’s admission discipline (higher throughput, smaller average number of customers in the
system, higher probability to get a service without visiting the orbit) in case of proper choice of the capacity of
the pool and the admission period duration
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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