1,721,293 research outputs found
Extended Future Internet: An IP Pervasive Network Including Interplanetary Communication?
No full textStarting from the evolution of Internet, this paper addresses the concept of pervasive computing whose aim is to create a pervasive network of heterogeneous devices which communicate data with each other and with other networking devices in a seamless way through heterogeneous network portions. This operative framework is also called Future Internet. Extending the idea of pervasive computing to interplanetary and other challenging links implies adding to the classical problems of pervasive communications such as quality of service, mobility and security, peculiarities such as intermittent connectivity, disruptive links, large and variable delays, and high bit error rates which are currently tackled through the paradigm of Delay and Disruption Tolerant Networking (DTNs). Satellite systems used to connect isolated and rural areas have already to cope with a series of challenges that are magnified in space communications characterized by huge distances among network nodes. At the same time, a space communication system must be reliable over time and the importance of enabling Internet-like communications with space vehicles (as well as with rural areas) is increasing, making the concept of extended Future Internet of practical importance. This paper will discuss this challenging issue
A preliminary study of diacetyl and acetoin reductase in low and high acetoin producing strains of Saccharomyces cerevisiae. Ital. J. Biochem., 46(1): 52-53.
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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
IoT and UAV Integration in 5G Hybrid Terrestrial-Satellite Networks
No full textThe Fifth Generation of Mobile Communications (5G) will lead to the growth of use cases demanding higher capacity and a enhanced data rate, a lower latency, and a more flexible and scalable network able to offer better user Quality of Experience (QoE). The Internet of Things (IoT) is one of these use cases. It has been spreading in the recent past few years, and it covers a wider range of possible application scenarios, such as smart city, smart factory, and smart agriculture, among many others. However, the limitations of the terrestrial network hinder the deployment of IoT devices and services. Besides, the existence of a plethora of different solutions (short vs. long range, commercialized vs. standardized, etc.), each of them based on different communication protocols and, in some cases, on different access infrastructures, makes the integration among them and with the upcoming 5G infrastructure more difficult. This paper discusses the huge set of IoT solutions available or still under standardization that will need to be integrated in the 5G framework. UAVs and satellites will be proposed as possible solutions to ease this integration, overcoming the limitations of the terrestrial infrastructure, such as the limited covered areas and the densification of the number of IoT devices per square kilometer
Flow Assignment and Processing on a Distributed Edge Computing Platform
No full textThe evolution of telecommunication networks toward the fifth generation of mobile services (5G), along with the increasing presence of cloud-native applications, and the development of Cloud and Mobile Edge Computing (MEC) paradigms, have opened up new opportunities for the monitoring and management of logistics and transportation. We address the case of distributed streaming platforms with multiple message brokers to develop an optimization model for the real-time assignment and load balancing of event streaming generated data traffic among Edge Computing facilities. The performance indicator function to be optimised is derived by adopting queuing models with different granularity (packet- and flow-level) that are suitably combined. A specific use case concerning a logistics application is considered and numerical results are provided to show the effectiveness of the optimisation procedure, also in comparison to a “static” assignment proportional to the processing speed of the brokers
Securing Virtual Power Plants: Attack Vector Analysis of Cybersecurity Vulnerabilities in Ancillary Grid Services
No full textVirtual Power Plants (VPPs) have emerged as critical infrastructure for grid stability, aggregating diverse Distributed Energy Resources (DERs) to provide essential ancillary services, including frequency regulation, voltage support, and emergency response capabilities. However, the technical requirements that enable VPPs to deliver these time-critical services simultaneously create unique cybersecurity vulnerabilities that distinguish them from traditional power generation and conventional smart grid systems. This paper establishes systematic connections between VPP technical requirements and cybersecurity threats through the integrated application of NIST and MITRE frameworks. The objective is to reveal critical threats specifically pertaining to ancillary services, comprehensive attack vector classification using MITRE ATT&CK techniques adapted for VPP environments, and mitigation strategies that maintain operational performance while addressing identified vulnerabilities
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