1,721,020 research outputs found
Detection and Isolation of Actuator/Surface Faults for a Large Transport Aircraft
No full textWe consider the problem of designing residual generators with least dynamical orders to solve actuator fault detection and isolation problems for a Boeing 747-100/200 aircraft. The main result of our analysis is the proof of feasibility of the complete isolation of all primary actuator/surface faults in the nominal case by using a minimal number of additional surface angle sensors. The analysis of the nominal case provides residual filter specifications which can be employed in a more realistic design, where robustness aspects with respect to external noise (gusts, measurements) and parametric/flight condition uncertainties are also considered
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
Numerical algorithms and software tools for analysis and modelling of descriptor systems
No full textAbstract. The paper presents a state-of-the art overview of algorithms and software for analysis and modelling of linear descriptor systems. The presentation focuses on algorithms for which reliable software implementations are already available. Most of mentioned software tools belong to a small Fortran subrou-tines library, called DESCRIPT, developed by the author. This library contains robust implementation of numerically reliable algorithms covering the basic computational problems in analysis and modelling of descriptor systems. DESCRIPT is the first systematized collection of software tools dedicated to descriptor systems. The analysis and modelling facilities for descriptor systems available in the interactive package CASAM are based exclusively on the subroutines from DESCRIPT
GARTEUR Open - Automated Generation of LFT-Based Parametric Uncertainty Descriptions from Generic Aircraft Models
No full textThis report has been prepared under auspices of the Responsables for Flight Mechanics, Systems and Integration of the Group for Aeronautical Research and Technology in EURope #GARTEUR# Group of Resp. : FM-GoR Report Resp. : A. Varga# Project Man. : J.C. Terlouw# Monitoring Resp. : J.T.M. van Doorn# Action Group : FM#AG08# Version : 1 Completed : April 4, 1997 c # GARTEUR 1997 #i# Date: April 4, 1997 Version: 1 List of authors Andras Varga Gertjan Looye Dieter Moormann Georg Gr#ubel DLR - Oberpfa#enhofen German Aerospace Research Establishment Institute for Robotics and System Dynamics P.O.B. 1116, D-82230 Wessling, Germany E-mail: [email protected], [email protected], [email protected] Delft UniversityofTechnology Faculty of Aerospace Engineering Kluyverweg 1, 2629 HS Delft, The Netherlands E-mail: [email protected] #ii# Date: April 4, 1997 Version: 1 Summary A computer assisted modelling methodology is developed for the generation of linearized models with parametric uncertainties described by linear fractional transformations. The starting point of the uncertainty modelling is a class of generic nonlinear aircraft models with explicit parametric dependence used for simulation purposes. The proposed methodology integrates specialized software tools for object-oriented modelling, for simulation, and for numerical as well as symbolic computations. The methodology has many generic features being applicable to similar nonlinear model classe
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
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