1,721,173 research outputs found
A simple and reliable technique to design kinematic-based sideslip estimators
No full textThis paper proposes two novel vehicle sideslip estimators, that aim at achieving ease of implementation and tuning, low computational cost and robustness, using only the most common automotive measurements, like vehicle position, acceleration and rotational velocity. The two estimators are only based on the unicycle kinematic model, thus they do not require any knowledge of uncertain or time-varying parameters, like vehicle parameters, or of road conditions, as it usually happens when dynamic models are adopted, and they have been derived by recasting an estimation problem into a linear control problem. Different experiments, ranging from standard driving manoeuvres to drifting driving and autonomous driving, have been performed to demonstrate the effectiveness of the proposal even in particularly critical scenarios, like driving at the limits of vehicle's handling. A comparison with a state-of-the-art sideslip estimator, using simulation and experimental data, is presented, as well
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
A review of prognostics and health management of machine tools
Full text linkThis paper presents a survey of the applications of prognostics and health management maintenance strategy to machine tools. A complete perspective on this Industry 4.0 cutting-edge maintenance policy, through the analysis of all its preliminary phases, is given as an introduction. Then, attention is given to prognostics, whose different approaches are briefly classified and explained, pointing out their advantages and shortcomings. After that, all the works on prognostics of machine tools and their main subsystem are reviewed, highlighting current open research areas for improvement
An experimentally validated LQR approach to autonomous drifting stabilization
No full textThis paper presents a drifting stabilizing controller for a rear-wheel-driven car, leveraging on front tyre steering angle and longitudinal force developed by rear tyres, the same control inputs available to a human driver. The proposed controller is based on a linear-quadratic regulator designed on a linearised single-track model of the vehicle, so that both longitudinal and lateral velocities along with yaw rate are stabilized. The controller has been experimentally validated on a scaled car. An extensive experimental campaign has been performed to demonstrate the robustness of this approach along with its shortcomings, that will be addressed in future works
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
21. P. V. C. Baur, M. I. Rostovtzeff, A. R. Bellinger. The Excavations at Dura-Europos. Preliminary Report of fourth season of work (1930-1931)
No full textPicard Charles. 21. P. V. C. Baur, M. I. Rostovtzeff, A. R. Bellinger. The Excavations at Dura-Europos. Preliminary Report of fourth season of work (1930-1931). In: Revue des Études Grecques, tome 48, fascicule 224, Janvier-mars 1935. pp. 172-173
21. P. V. C. Baur, M. I. Rostovtzeff, A. R. Bellinger. The Excavations at Dura-Europos. Preliminary Report of fourth season of work (1930-1931)
No full textPicard Charles. 21. P. V. C. Baur, M. I. Rostovtzeff, A. R. Bellinger. The Excavations at Dura-Europos. Preliminary Report of fourth season of work (1930-1931). In: Revue des Études Grecques, tome 48, fascicule 224, Janvier-mars 1935. pp. 172-173
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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