1,720,961 research outputs found
Enhancing service discovery performance over home networks
No full textThe purpose of this study was to investigate how dropped messages can be avoided during the service discovery process of the Universal Plug and play (UPnP) protocol in home networks. Another aim involved determining the causes of those messages being dropped during the service discovery process, with many protocols being examined. The thesis proposes an algorithm that can compute the .,/]1tr)imum period of time .. required between a consecutive burst of services' reply messages and that determines the minimum required queue sizes for the routers' nodes to manage the traffic and avoid dropped messages. The proposed solution is applied at the application layer in' end nodes, not router nodes, as this would reduce the load on router nodes, freeing them up for other routing functions. The solution takes into consideration many of the network parameters such as network size, message size and existing traffic. An NS2 simulator was used to examine the produced algorithm on two different network configurations - centralized and decentralized - which was tested with three different types of queue management algorithms: drop tail, Random Early Detection (RED) and Random Exponential Marking (REM). In addition, its functionality was examined in a hybrid network, which included both wired and wireless connections. The results show an improvement in the discovery rate and a reduction in the number of dropped messages, highlighting the capability of the proposed algorithm in dealing with modifications to the network topology and in changing the density of the existing traffic. The principal conclusion was that the UPnP scales up well with its extensive use of messaging through managing the rate of replied services' messages.EThOS - Electronic Theses Online ServiceGBUnited Kingdo
Developing Energy Aware Distributed Aggregation Tree Technique for Wireless Sensor Networks
Get PDFWireless sensor network WSN consists of small sensor nodes with limited resources, which are sensing, gathering and transmitting data to base station. Sensors of various types are deployed ubiquitously and widely in varied environments for instance, wildlife reserves, battlefields, mobile networks and office building. Sensor nodes are having restricted and non replenishable power resources and this is regarded as one of the main of their critical limits. All applied techniques and protocols on sensor nodes must take into consideration their power limitation. Data aggregation techniques are used by sensor nodes in order to minimize the power consumption by organizing the communication among sensor nodes and eliminating the redundant of sensed data. This paper proposed lightweight modification on data aggregation technique named Energy Aware Distributed Aggregation Tree EADAT. The main principle of this development is using the available information in sensor nodes to pass the role of parent node among sensor nodes in each cluster. The process of passing parent node role is based on nominating the sensor nodes which have higher power on regular bases. A model based on tree network architecture is designed for validation purpose and is used with NS2 simulator to test the proposed development. EADAT and EADAT with proposed development are applied on the designed model and the results were promising
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
ANALYZING AND EVALUATING THE SECURITY STANDARDS IN WIRELESS NETWORK: A REVIEW STUDY
Get PDFWireless networks used widely in office, home, and public places so security is one of the significant issues to keep the transmitted information safe. The applied security standards have been developed in response to the demand of high security and the developed hardware with software. Currently, the available security standards are (WEP, WPA, WPA2 and under development WPA3). These security standards are different in the offered security level base on the employed authentication method and encryption algorithms. The major objective of this paper is studying security standards and analyzing them based on their features. In addition to presenting a detailed review about WPA3 and its improvements over the older security standards. The conducted evaluations explained the differences among the Wi-Fi security standards in term of the offered security level, software and hardware requirements
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
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