1,720,961 research outputs found
A Force Dependent Scaling for Improving the Human Perception in Bilateral Teleoperation
No full textIn this paper a scaling function for an hapticsystem is the output of the psychophysics experiments that havebeen carried out with the aim of better understanding the humanperception capabilities. The experimental work consists inmeasuring the differential thresholds of force perception appliedto the hand-arm system. These findings support our claim thatthe human perception of forces and torques depends on forceintensity and works differently along different directions, thussuggesting that perception can be enhanced by suitable scaling.We have identified a scaling function for each direction and wehave shown that this variable scalings can be safely embeddedin a passivity based teleoperation system in order to improvethe feeling perceived by the user during the interaction withremote environments
Development of monitoring system to assess honeybee colony health
Full text linkIn the last decades, beekeepers recorded millions of honey bee (Apis mellifera) colony losses due to climate change, and crop chemical treatments, but mostly the parasitic spreading of mites, in particular Varroa destructor. The mite lives in synchrony with the brood, parasitizing bees' brood before capped. The growing mites start feeding on the larva, weakening without killing the host. Once the affected larva becomes a bee, it leaves the brood cell, by uncapping the wax cap, allowing the parental mites and their offspring to spread out. The weakening from the mite feeding leads to evident symptoms as bees are unable to fly (deformed wing virus), helping mites to spread out and lead the colony to collapse. The presence of these viruses has been directly linked to colony losses, thus raising the need for more accurate techniques to measure and estimate the rate of infestation. The most used method for detecting a Varroa destructor infestation is manual sampling. Typically, a bunch of live bees (almost 300 bees) is put into a jar with alcohol or powdered sugar and shaken until most mites fall off. An alternative consists of sampling the brood by opening brood cells and checking for mites' presence. Lastly, a noninvasive method but still manual makes use of a bottom sticky board placed under each beehive to monitor the natural mite drop. However, all these methods have drawbacks. For these reasons, automatic monitoring inside the beehive might be a valid support tool for beekeepers to estimate the mite infestation level, limiting manual inspections and continuously monitoring the mite infestation level.
In this research project, the authors are working on developing an image-based acquisition system to gather samples of healthy and sick bees inside the beehive, with the aim of providing a tool for beekeepers to support the decision-making phases to limit the spread of mites
Perception-Centric Force Scaling Function for Stable Bilateral Interaction
No full textIn this paper a force scaling function for an haptic system is the output of the psychophysics experiments that have been carried out with the aim of better understanding the human perception capabilities. The experimental work consists in measuring the differential thresholds of force perception applied to the hand-arm system. These findings support our claim that the human perception of forces and torques depends on force intensity and works differently along different directions, thus suggesting that perception can be enhanced by suitable scaling. We have identified a scaling function for each direction and we have shown that this variable scalings can be safely embedded in a passivity based teleoperation system in order to improve the feeling perceived by the user during the interaction with remote environments
A new image processing filter for the automatic extraction of organs’ internal structures: Application to liver tumors
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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
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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