1,720,958 research outputs found
Priority Service of Primary Customers in the M/G/1/r Retrial Queueing System with Server Searching for Customers
No full textIn this paper a queueing system with a single customer searching server, retrials, finite
buffer, Poisson flow and general distribution of service time is considered. An arriving customer joins
a retrial orbit if he finds the buffer fully occupied. After finishing the service, the server searches
for the next customer to be served among the customers in the buffer. The inter-retrial times are
exponentially distributed with parameter
. An orbiting customer can be served only if the buffer is free.
A computational algorithm for stationary distribution of the primary queue length and a formula for the
mean number of customers in the system are presented
Retrial servicing of multivariate Poisson flow with customer-searching server with finite buffer
No full textRetrial servicing of Poisson flow in a system of finite capacity with customer-searching server
No full textOn the Single-Server Queueing System with Fixed Number of Retrials
No full textThe single-server exponential queueing system without
the buffer and with a fixed number, m, of retrials is
considered. The aim of the paper is to analyze this
queueing model. An approach based on the concept of
recurrent relationship between the steady-state
distribution of the underlying Markov process and the
number of retrials m, m-1,...,1 is proposed. A recurrent
algorithm to calculate the steady-state distribution is
constructed. On the basis of this algorithm, the mean
queue length of retrial customers and some other
important system efficiency measures can be calculated
M/G/1/r retrial queueing system with priority service of primary customers and a customers-searching server
No full textIn this paper a queueing system with a single customer searching server, retrials, finite buffer,
Poisson flow and general distribution of service time is considered.
An arriving customer joins a retrial orbit if he finds the buffer fully occupied. Upon completion
the service, the server searches for the next customer to be served among the customers in the buffer.
The inter-retrial times are exponentially distributed with parameter γ. An orbiting customer can be
served only if the buffer is free. A computational algorithm for stationary distribution of the primary
queue length and a formula for the mean number of customers in the system are presented
A retrial queueing system with a finite buffer, several input flows and a customer-searching server
No full textWe consider a single-server retrial queueing system with K Poisson flows of customers, which arrive to a buffer of finite capacity. If a customer upon arrival finds the buffer full, he joins an orbit of limited capacity in order to return to the queue again after an exponentially distributed time interval. An arriving customer is lost if he finds the buffer and orbit fully occupied. The service time of an i-type customer has an arbitrary distribution function Bi(x). Every service completion is followed by a search phase with exponentially distributed duration to seek for the next customer for service. Customers are taken by the server from the queue according to the FCFS discipline.
It is proved that the analysis of this queueing system is reduced to the analysis of a similar queueing system but with only one Poisson flow
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
- …
