1,720,958 research outputs found
Nano-wireless communications for microrobotics: an algorithm to connect networks of microrobots
No full textMicro and nanorobotics represents one of the most challenging sectors of modern robotics. Through batch fabrication of Micro Electro-Mechanical Systems (MEMS), advanced small scale sensing and actuating tasks in a wide area of applications can be performed. Most miniaturized electro-mechanical devices are characterized by low-power and low-memory capacity. The huge number of modular robots introduces the need to explore novel self-reconfiguration algorithms to optimize movement and communication performances in terms of efficiency, parallelism and scalability. Nano-transceivers and nano-antennas operating in the Terahertz Band are already a well acquainted communication paradigm, enforcing nano-wireless networking that can be directly integrated in MEMS microrobots. Several logical topology shape-shifting algorithms are already implemented and tested in literature, along with performance evaluation on nano-wireless use. This article aims to provide an algorithm to reconnect groups of microrobots, along with a novel movement model for microrobotics ensembles introduced to enforce more realistic simulations. Special emphasis is given on the need of novel movement algorithms for swarms of microrobots
Nano-wireless communication for microrobotics: bridging the gap
No full textAmong all the new robotics technologies, great interest is rising in the field of microrobotics. Micro Electro-Mechanical Systems (MEMS) microrobots are miniaturized electro-mechanical devices that can perform various tasks in a wide area of applications. Despite the low-power and low-memory capacity, they are provided with sensors and actuators. Self-reconfiguration is a key factor for MEMS microrobots to perform their tasks and to optimize their communications in order to achieve efficiency, parallelism and scalability. Nano-transceivers and nano-antennas operating in the Terahertz Band offer a promising communication paradigm, providing nanowireless networking directly integrated in MEMS microrobots. Catoms from Claytronics project are an appropriate microrobotics case to explore this novel framework. Several logical topology shape-shifting algorithms have been implemented and tested, along with different nano-wireless simulations. This paper aims to provide a survey on nano-wireless communication for modular robotics and propose some optimization choices. Special emphasis is given to the use of the nano-wireless communications for topology formation and maintenance in microrobotics
HIRO-NET: Heterogeneous intelligent robotic network for internet sharing in disaster scenarios
Full text linkThis article describes HIRO-NET, an Heterogeneous Intelligent
Robotic Network. HIRO-NET is an emergency infrastructure-less
network that aims to address the problem of providing connectivity in
the immediate aftermath of a natural disaster, where no cellular or
wide area network is operational and no Internet access is available.
HIRO-NET establishes a two-tier wireless mesh network where the
Lower Tier connects nearby survivors in a self-organized mesh via
Bluetooth Low Energy (BLE) and the Upper Tier creates long-range
VHF links between autonomous robots exploring the disaster stricken
area. HIRO-NET’s main goal is to enable users in the disaster area to
exchange text messages to share critical information and request help
from first responders. The mesh network discovery problem is analyzed
and a network protocol specifically designed to facilitate the exploration
process is presented. We show how HIRO-NET robots successfully
discover, bridge and interconnect local mesh networks. Results show
that the Lower Tier always reaches network convergence and the Upper
Tier can virtually extend HIRO-NET functionalities to the range of a
small metropolitan area. In the event of an Internet connection still being
available to some user, HIRO-NET is able to opportunistically share and
provide access to low data-rate services (e.g., Twitter, Gmail) to the
whole network. Results suggest that a temporary emergency network
to cover a metropolitan area can be created in tens of minutes.
Inde
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
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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