1,721,342 research outputs found
Development of technologies for low-cost oceanographic unmanned aeronautical vehicles
No full textOceanographic research vessels and buoys typically provide high-resolution, shortrange measurements at a high sample rate. Satellites provide wide-range, low-resolution measurements at a low sample rate. Therefore a gap exists in oceanographic observation capability for medium-range, high-resolution measurements at a high sample rate. An Unmanned Aeronautical Vehicle (UAV) could bridge this gap.This research has provided a mission-ready autopilot and ground station for future oceanographic application by the National Oceanography Centre, Southampton. A sea landing is the only available option, which carries a low probability of UAV reuse and therefore requires a low-cost system. This and other application specific requirements led to the development of all autopilot and ground station software. This research provided novel contributions of pseudo-derivative feedback controllers for flight control, the generation of optimised matrix calculations for high-frequency aircraft state estimates on a low-powered processor and the use of a finite impulse response filter for reduced aliasing of transmitted flight data.A novel in-flight method for autonomously optimising controller response has been developed and successfully demonstrated in realistic simulation and practical flight tests of a commercial model aircraft. This method does not require an experiencedoperator or known aircraft dynamics and provides a quantitative measurement of optimality.Two novel path tracking algorithms have been presented. The first controls the derivative of heading rate to command an achievable trajectory. The second controls the aircraft's closing speed on the path by adjusting bank angle. The latter algorithm achieved a robust tracking performance under simulated high wind conditions and practical flight tests and is suitable for oceanographic UAV operation
For blood, sweat and tears : the severing of subconscious connections with company and business model
No full textHumans have altered environments and enhanced their well being unlike any other creature on the planet (Heilman & Donna, 2007); this is no different whether the environment is ecological, social or organisational. In recent times business modelling techniques have become intricately detailed in the pre-designing and evaluating of business flow before the final implementation (Ou-Yang & Lin, 2008). The importance of the organisation change and business process model is undeniable. The feedback received from real business process users is that the notation is easy to learn; the models do help people to understand the process better; the models can be used to improve the (business) process; and the notation is expressive enough to capture the essential information (Bennett, Doshi, Do Vale Junior, Kumar, Manikam, & Madavan, 2009)
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
A robust control algorithm for path tracking by an oceanographic unmanned aeronautical vehicle
No full textWe present a path tracking algorithm for navigation of an oceanographic unmanned aeronautical vehicle. Aircraft bank angle is used to maintain desired closing speeds along and normal to the desired track. The algorithm is capable of tracking linear and circular path segments. Simulated flights under near gale force winds suggest the algorithm is sufficiently robust for practical navigation during off-shore research. The algorithm's simplicity permits a high frequency update by the autopilot's low-power processor
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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