1,721,526 research outputs found
System-Level Study of Data Duplication Enhancements for 5G Downlink URLLC
Full text linkData duplication is studied as a fundamental enabler for ultra-reliable low-latency communication (URLLC) in fifth-generation cellular systems. It entails the simultaneous usage of multiple radio links delivering redundant data between a terminal and the network to boost the transmission reliability. However, the improved reliability comes at a cost of reduced spectral efficiency, since the transmission of multiple instances of the data message on different links occupies more radio resources as compared to sending only one instance using a single link. It is, therefore, crucial to improve the performance of data duplication schemes, with the aim of reducing the radio resource consumption without degrading the reliability gain provided by this transmission paradigm. In this paper, we propose several methods to increase the downlink URLLC capacity supported by data duplication in fifth-generation cellular networks based on the New Radio standard. A single-user analytical model is derived to evaluate a combination of the proposed enhancements. The most promising solution, namely selective data duplication upon failure which entails a massive reduction of the overall number of duplicate transmissions, is finally evaluated by means of extensive multi-user system-level simulation campaigns. The simulation results with background mobile broadband traffic show that, in the investigated scenario, the proposed solution with 4 Mbps offered URLLC traffic outperforms the baseline approach for data duplication with 1 Mbps offered URLLC traffic, thus increasing the amount of URLLC user equipments that can be effectively sustained by the network
Kill-the-PLC: implementation and performance evaluation of a disruptive robotic cell environment based on 5G and edge-cloud technologies
No full textThis project will investigate a disruptive industrial concept consisting in re-architecting the control network of an operational robotic cell environment (composed by a PLC and robotic arm) applying 5G and edge-cloud technologies. By making use of those technologies, the cell processing and computing power, which is currently done by the PLC on-site, could be offloaded to a centralized edge-cloud location, allowing for mass-offloading, optimization, and flexibilization of the industrial production process.
The student is expected to analyze and understand the functioning of the current robotic cell both from a communications and industrial production point of view, identifying the different PLC and robotic control interfaces and their associated communication protocols and requirements. Based on the initial analysis, the student will propose one or several architectures for “cloudified” operation using edge-cloud capabilities and communication over 5G technology. The student is also expected to implement and validate the proposed architectures. The project will investigate the use and performance of industrial communication protocols such as MQTT and OPC-UA for optimized performance in live operational conditions.
The proposed activities will take place under the umbrella of the “5G-ROBOT: 5G-Enabled Autonomous Mobile Robotic Systems” Danish national project, and the student is expected to disseminate the ongoing work and learnings both internally and externally towards industrial partners.
The experimental work will take place at the AAU 5G Smart Production Lab, where 5G SA NPN Rel. 15/16 with FR1 and FR2 support and edge-computing are available for industrial research and live testing in operational conditions. The student will work in close cooperation with other students, expert researchers in the areas of robotics, industrial manufacturing, and communications, and representatives from industrial partners
Design and Implementation of a 5G-Connected Edge-Cloud Platform for Autonomous Mobile Robots Route Planning
No full textGoing 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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