1,720,953 research outputs found
Machine Design and Vision Based Navigation
No full textThis study covers the design of an autonomous robot and its testing
process on an artificial maize field constructed for an indoor environment.
However, the ultimate goal of this project was to participate in the Field
Robot Event 2014 organized by the University of Hohenheim in Germany.
This project was commissioned by HAMK University of Applied
Sciences. And was fabricated and tested in the automation laboratory of
HAMK UAS valkeakoski.
The test result obtained by plotting the signal from wheel encoder, sonar
sensor, gyroscope, magnetic compass was used as a primary source of information.
Different scientific literature published on four wheel differential
drive and vision based navigation was well examined for background
information. Beside literature, rules and the regulation of the FRE 2014
were used as a source of information as well. In addition to these a working
video on a previous field robot event provided a good reference for
planning and designing an autonomous robot.
A four-wheel differential drive chassis with a suspension system was designed
and fabricated. Sensors such as a magnetic compass, gyroscope,
sonar sensor, wheel encoder and camera were used to sense the environment.
A suitable control algorithm was developed to meet the requirements
of the competition. An indoor test field was designed with the artificial
maize plants made up of paper and plastic tube. This test field was
used to examine the control modules designed for different level. After a
series of testing and tuning, a smooth navigation through row of corn was
achieved. Oscillation was dropped down to nominal level; obstacle was
identified from a safe distance and weed plants was successfully detected.
The findings suggest that the performance of the robot is satisfactory.
However, there are several possibilities for improving it. These include:
replacing a sonar sensor with laser range scanner for detecting maize
plants. Simultaneous localization and mapping can also be introduced. The
author strongly recommends implementing a laser range scanner and stereo
vision in to a future project
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
Development of collision avoidance control for tele-operated dual robotic arm
Get PDFThis study presents the development of collision avoidance control for tele-operated dual robotic arm. The main aim of this project was to develop collision avoidance control to minimize the collision in human robot interaction. In absence of work cell mapping, collision checking in tele-operated robotic arm is commonly performed based on the motor current or torque. However, the collision checking based on motor current or torque cannot predict the collision. To overcome this issue collision avoidance based on proximity sensor and collision checking based on the unified robot description file are presented in this thesis. Test results obtained from collision checking using sonar sensors are presented. The findings suggest that the performance of the collision avoidance control is effective in minimizing risk of collision in tele-operation
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