1,720,973 research outputs found
Non-Invasive Multi-Camera Gait Analysis System and Its Application to Gender Classification
No full textObjective: Most studies have conducted human gait analysis using expensive and invasive
photogrammetric systems. The objective of this study was to demonstrate that non-invasive and cost-effective
systems based on depth cameras may be able to retrieve relevant features of human gait patterns. We aimed
to prove this by solving the problem of gait classification by gender. Methods: 81 participants (40 female
and 41 male) walked at a self-selected speed across a 4.8-meter walkway. Gait data was recorded using
multiple depth sensors. Analysis in time domain included joint excursions by gait phases, range of movement
(ROM), central tendency and dispersion measures, spatial variables, and center of mass (COM) position. The
spectral analysis included principal frequency, magnitude, and phase shift during walking. Only features with
significant differences by gender were used to train a support vector machine (SVM) classifier. Results:
A total of 108 features presented significant differences by gender (p<0.05). On this basis, the accuracy of
the chosen model was 96.7%. Trunk rotation, trunk sway, knee abduction/adduction, and pelvic obliquity
were the most differentiated between the groups. The COM position shown a significant difference by gender
(p=0.0065) with 51.7% and 51.0% for men and women respectively. Women proved to have significantly
shorter normalized step width than men (p=0.0472). Conclusion: The proposed method was able to retrieve
most of human gait features correctly, including differences in gait pattern by gender. Significance: Depth
cameras represent a cost-effective system that could be used for a deeper biomechanical human gait analysis.The research leading to these results has received funding
from RoboCity2030-DIH-CM, Madrid Robotics Digital
Innovation Hub, S2018/NMT-4331, funded by ‘‘Programas
de Actividades I+D en la Comunidad de Madrid’’ and
co-financed by Structural Funds of the EU. The authors
would like to thank Faculty of Physical Activity and Sports
Sciences - INEF, UPM, for the use of Sports Biomechanics
Laboratory. The authors also acknowledge Enrique Navarro
Cabello and Javier Rueda for their contribution during the
experimental stage.Peer reviewe
Development and validation of a ROS-based mobile robotic platform for human gait analysis applications
No full textBackground:Theintegrationof mobileroboticplatformsin humangaitanalysisoffers thepotentialtodevelop multiple medical applications and achieve new discoveries. The aim of this paper is to presenta first design and validation of a ROS-based mobile robotic platform for human gait analysis.Methods:During the design stage, the model identification and the configuration of the control lawwere performed. The design of the control law required the integration of a lead compensator and aFiltered Smith Predictor (FSP). During the validation procedure, the accuracy of the system to retrievekinematic gait data and the main descriptors of gait disorders was calculated with respect to theground truth of a Vicon system. For this purpose, one hundred gait recordings were processed thanksto the collaboration of twenty participants. The participants walked in a one-way straight line gait.Results:Results showed high correlation and low error rates mainly in joint excursions from sagittaland transverse planes.Conclusion:This gait analysis system demonstrated several advantages compared with the currentapproaches. The use of a mobile robotic platform allowed gait analysis in long tracking ranges andwithout space limitations. Furthermore, the design of a suitable control law allowed a smooth trackingof the person. This led to optimal results when assessing joint excursions.Significance:This system represents a cost-effective and non-invasive alternative that could be usedfor human gait analysis applications.The research leading to these results has received funding from RoboCity2030-DIH-CM, Madrid Robotics Digital Innovation Hub, S2018/NMT-4331, funded by “Programas de Actividades I+D en la Comunidad de Madrid, Spain” and co-financed by Structural Funds of the EU . The authors would like to thank Faculty of Physical Activity and Sports Sciences - INEF, UPM, for the use of Sports Biomechanics Laboratory. The authors also acknowledge Enrique Navarro Cabello and Javier Rueda for their contribution during the experimental stage.Peer reviewe
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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