1,720,959 research outputs found
Evolution of Wireless Sensor Networks towards the Internet of Things: a Survey
No full textWireless Sensor Networks (WSNs) are playing more and more a key role in several application scenarios such as healthcare, agriculture, environment monitoring, and smart metering. Furthermore, WSNs are characterized by high heterogeneity because there are many different proprietary and non-proprietary solutions. This wide range of technologies has delayed new deployments and integration with existing sensor networks. The current trend, however, is to move away from proprietary and closed standards, to embrace IP-based sensor networks using the emerging standard 6LoWPAN/IPv6. This allows native connectivity between WSN and Internet, enabling smart objects to participate to the Internet of Things (IoT). Building an all-IP infrastructure from scratch, however, would be difficult because many different sensors and actuators technologies (both wired and wireless) have already been deployed over the years. After a review of the state of the art, this paper sketches a framework able to harmonize legacy and new installations, allowing migrating to an all-IP environment at a later stage. The Building Automation use case has been chosen to discuss potential benefits of the proposed framework
Implementation of the EXI schema on wireless sensor nodes using Contiki
No full textThe current trend in Wireless Sensor Networks (WSN) is to use the Internet Protocol (IP) and open standards to achieve native connectivity between smart objects and the Internet, contributing to consolidate the Internet of Things (IoT). Emerging standards such as 6LoWPAN/IPv6 and CoRE/CoAP will play a very important role in a RESTful Web of Things, where each node has its own IPv6 address and is able to provide information and control about itself. Data exchanging in Machine To Machine (M2M) applications and communication with Web services require the use of structured data. XML is a possible solution, but its verbosity is not suitable for a WSN (e.g. based on IEEE 802.15.4) characterized by limited packet size. This paper investigates the benefits of Efficient XML Interchange (EXI) in a real scenario, considering sensor nodes running on the Contiki RTOS. For this purpose, the authors have implemented an extremely lightweight version of EXI for Contiki running on application boards with just 8 Kbyte RAM memory
Architecture of QOSMIC - A QoS Manager for Internet Connections
No full textRSVP is an Internet protocol designed to reserve network resources. Availability of optimized free implementations of RSVP daemon and the development of extensions designed to improve RSVP's behaviour have increased the attention towards the protocol. Though RSVP has been designed to fulfill QoS needs of multimedia applications, development of compliant applications is slowed by complexity of logic behind the access to QoS. This paper describes the current problems related to the deployment of RSVP into multimedia applications and the QOSMIC architecture in support to multimedia applications that tries to solve these problems. The QOSMIC elements allow a user to reserve resources without requiring the update of multimedia applications neither on the client side nor on the server one, allow a receiving user to require RSVP Path messages needed to start reservations and allow a centralized management of QoS. A test implementation of QOSMIC is also briefly described
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
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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