1,721,174 research outputs found
A researching step on the WSN routing protocols' scope: ProMultihoping proposal
No full textAbout the research made by the author over the different behavior of two main topologies of WSN routing protocols. These topologies are clustering and flat. There is a lot of literature of energy-efficient clustering routing protocols, also of energy-aware flat routing protocols. After reading are proved both performances by simulations. As in Wireless Sensor Network the most important break point is energy management, knowing behavior of routing protocol it is possible to find the best energy management in each moment.After that, a new energy-aware routing protocol are proposed and compared. Also an aggregation mode is proposed and checked it by simulating
Energy Efficient Mechanism for Next Generation Networks: Adaptive Resource Allocation
No full textThe objective of this project is to propose a methodology for resource consolidation, which minimizes the power consumption of a large network, in which the resource overprovisioning is quite big. The project focuses on the operation of core MPLS networks. The proposed approach is based on a Software Defined Networking (SDN) scheme with a reconfigurable centralized controller, which turns off network elements (nodes/links). The switch on/off pattern of the elements is determined by a dynamic database, based on customers’ consumption statistics and real time network statistics. The proposed methodology describes the process of identifying time periods with lower traffic demand; ranking the network elements, based on their utilization and criticality; rerouting the traffic off the least utilized elements; and finally switching off the appropriate nodes or links. An algorithm for traffic rerouting, based on MPLS traffic engineering techniques is proposed and its performance is evaluated in terms of the achieved energy efficiency in accordance with predefined connectivity and quality of service constraints
Lightweight robust cryptographic combiner for mobile devices: Crypto Roulette
No full textAbstract -The amount of data generated by connected devices have increased dramatically since the beginning of the century with the prediction that until the end of the decade the number of connected devices will increase to over 50 billion. This huge increase of network data traffic and the heterogeneity of modern and future networks lead to increased demand for lightweight encryption algorithms. These algorithms must be able to cope with the large increase of data traffic and the ever-growing increase in computational capabilities. This means that any cryptographic algorithm that hopes to meet these demands must increase the computational complexity while maintaining computational cost. Striving to meet those requirements might seem as causa perduta right from the start. Indeed to meet such high standards a shift in paradigm is required. We should not only strive to create and use new algorithms, but also should optimize the use of existing algorithms.This thesis proposes a new algorithm, Crypto Roulette, which builds on the achievements of modern symmetric cryptography systems in order to create a strong and lightweight solution. The proposed algorithm was inspired by frequency hopping communication systems. These systems switch randomly between different carrier frequencies in order to prevent unwanted eavesdropping. The proposed solution using a similar concept makes use of different symmetric cryptographic algorithms. The proposed solution is a combination of algorithms that provide high robustness and security. The solution increases security while marginally increasing the amount of computational resources needed for encryption and decryption. The envisioned system uses either two pairs of synchronized pseudorandom number generators or a time variable based on the transmission time to achieve synchronization between the communicating parties. The cryptographic strength of the proposed system depends on two factors: the number of the undelaying symmetric cryptographic algorithms and the type of keying option used.Based on the simulation results, the Crypto Roulette demonstrates significant increase in performance. The comparison and results have also shown that the number of undelaying algorithms does not affect the computational cost of the system. This means that the Cryptographic Roulette algorithm can easily be scaled to suite a wide range of requirements.<br/
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
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