1,720,973 research outputs found
Task analysis and kinematic design of a novel robotic chair for the management of top-shelf vertigo
No full textThe present work addresses the task analysis and the kinematic design of a novel robotic chair
to be used for diagnosing and treating Benign Paroxysmal Positional Vertigo (BPPV).
The task analysis process is based on: 1) Direct specifications given by well-trained doctors;
2) Theoretical considerations built upon a mathematical model describing BPPV dynamics.
BPPV is the most frequent cause of vertigo and it is characterized by intense symptoms of
dizziness and nausea of short duration which are induced by a postural variation of the patient. A common name for BPPV is "top-shelf vertigo", since dizziness often occurs when
tilting back the head, such as when looking at objects on the top shelf. In the elder patients,
it represents a frequent cause of equilibrium loss and consequent possible traumatic injuries.
Sometimes BPPV symptoms disappear spontaneously but more often they tend to last for
months or even years if not adequately treated. It was estimated that 20% of the patients that
complain about dizziness are affected by BPPV (approximately 64 in 100,000 people per year
in Northern America (Baloh et al., 1989; Froehling et al., 1991; Honrubia et al., 1996))
Robotic modelling and simulation: theory and application
Get PDFThe employment of robots in manufacturing has been a value-adding entity for companies in gaining a competitive advantage. Zomaya (1992) describes some features of robots in industries, which are decreased cost of labour, increased flexibility and versatility, higher precision and productivity, better human working conditions and displaced human working in hazardous and impractical environments. Farrington et al. (1999) states that robotic simulation differs from traditional discrete event simulation (DES) in five ways in terms of its features and capabilities. Robotic simulation covers the visualization of how the robot moves through its environment. Basically, the simulation is based heavily on CAD and graphical visualization tools. Another type of simulation is numerical simulation, which deals with the dynamics, sensing and control of robots. It has been accepted that the major benefit of simulation is reduction in cost and time when designing and proving the system (Robinson, 1996). Robotic simulation is a kinematics simulation tool, whose primary use is as a highly detailed, cell-level validation tool (Farrington et al., 1999), and also for simulating a system whose state changes continuously based on the motion(s) of one or more kinematic devices (Roth, 1999). It is also used as a tool to verify robotic workcell process operations by providing a “mock-up” station of a robots application system, in order to check and evaluate different parameters such as cycle times, object collisions, optimal path, workcell layout and placement of entities in the cell in respect of each other. This paper presents the methodology in modelling and simulating a robot and its environment using Workspace and X3D software. This paper will discuss the development of robotic e-learning to improve the efficiency of the learning process inside and outside the class. This paper is divided into five sections. Section 2 discusses the robotic modelling method. Section 3 discusses robotic simulation. Its application using Workspace and X3D is presented in Section 4, and a conclusion is drawn in Section 5
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
Are “the semantic aspects” actually “irrelevant to the engineering problem”?
No full textAt the beginning of his famous “Mathematical Theory of Communication” (MTC), Shannon removes the semantic questions from the technical task, and such exoneration seems to be commonly accepted, even for those who certainly care for ‘semantic questions’. However, the MTC communication model itself is built upon this fundamental assumption, which at the same time is used in other information theories and –even with wider practical consequences– as a design pattern for the Information Technologies. When the human communication is more and more dependant with respect to information technologies, the suitability of the communication model used to design the technological systems has to be put into scope. Non essential element needed to establish a proper human communication should be omitted; otherwise this technology could isolate people, betraying its hypothetical purpose. Comparing the technological model to other based on several pragmatic theories of communication (emerged in linguistics, semiotic, psychology and anthropology) is shown the insufficiency of the technological model, pointing out some elements that a new model should not forget.</jats:p
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