1,720,955 research outputs found
Black Virus Disinfection in Chordal Rings
No full textThe topic of this thesis is black virus disinfection using mobile agents. The black virus is a faulty node that destroys any visiting agent without leaving a trace; moreover, once the black virus is triggered by an agent, it clones itself and spreads to neighbouring nodes. These viruses can only be destroyed if they move to nodes that have been occupied by agents. In this thesis, we consider the black virus disinfection problem in chordal rings. Initially, the system contains a single black virus that resides at an unknown location. We propose a solution that involves deploying a team of mobile agents to locate the original black virus and to prevent further damage once it has been triggered. Our protocol is divided into two phases: 1) searching the graph until the black virus is found and triggered and 2) sending agents to occupy the neighbouring nodes of the black virus in order to trigger and destroy all the black viruses at once. Our solutions are monotone, meaning that once a node has been explored it is protected from re-infection. In order to measure the efficiency of our protocol we consider the total number of agents required for disinfection, the overall number of black viruses and the number of moves required by the agents. We then analyze the cost of all our solutions, providing optimal bounds for some classes of chordal rings
On Improving Handover Delay in Software-Defined Mobile Networks
No full textThe Software-Defined Networking (SDN) paradigm has become essential in tackling
several issues and challenges in conventional networking, especially in mobile wireless networks. In order to realize the benefits brought by SDN to mobility management, we study the effects of SDN in conjunction with the OpenFlow protocol on the handover procedure. In this new setting, the completion of a handover procedure still requires the exchange of signaling messages between the control and data planes through OpenFlow channels, especially in the case of a hard handover, where the “breakage” in an on-going session is correlated to the exchange of management and reconfiguration messages. Consequently, the handover still suffers delay. One of the main causes of delay is the processing delay of those signaling messages. Three of the main factors contributing to the processing delay are the handling procedures, forwarding mechanisms of the network’s devices, and the load on controllers. Therefore, in this work, we target these three factors. First, we design an effective handling procedure of the exchange of signaling messages in the OpenFlow channels between the controllers and switches. Second, we provide a forwarding mechanism that is designed to reduce the number of switches involved in configurations of the data plane. Third, we propose a load balancing mechanism to mitigate the over-loading state that may cause longer delay periods. As for our first target, we provide an analytical model, which gave us the ability to model two handover-related OpenFlow messages. Following our analysis, we propose a novel solution to make handover more efficient and less interruptive. Furthermore, we study our solution in the Long Term Evolution (LTE) architecture. As for our second target, we take network heterogeneity into account, and accordingly, we provide an efficient approach using the MobileIP protocol, which shows improvement in decreasing total processing delay. Regarding the third target, we employ “vertical mobility” in our load balancing framework to minimize the maximum response time; thus, the users’ mobility-related procedures can be completed with less delay
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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