Brain–machine interfaces are systems that allow the control of a device such as a robot arm through a person’s brain activity; such devices can be used by disabled persons to enhance their life and improve their independence. This paper is an extended version of a work that aims at discriminating between left and right imagined hand movements using a support vector machine classifier to control a robot arm in order to help a person to find an object in the environment. (...) The main focus here is to search for the best features that describe efficiently the electroencephalogram data during such imagined gestures by comparing two feature extraction methods, namely the continuous wavelet transform and the empirical modal decomposition, combined with the principal component analysis that were fed through a linear and radial basis function kernel SVM classifier. The experimental results showed high performance achieving an average accuracy across all the subjects of 92.75% with an RBF kernel SVM classifier using CWT and PCA compared to 80.25% accuracy obtained with EMD and PCA. The proposed system has been implemented and tested using data collected from five male subjects and it enabled the control of the robot arm in the right and the left direction. (shrink)
La autora estudia el problema del amor entendido como reunión de las dos partes de un alma-esfera, mito griego que ha tenido una larga tradición en la literatura amorosa árabe y se centre especialmente en Ibn Hazm de Córdoba.
Book review: FERRAZ, Salma; MAGALHÃES, Antônio C. M.; BRANDÃO, Eli et alii.. Teologia do Riso: humor e mau humor na Bíblia e no cristianismo. Campina Grande: EDUEPB, 2017. 574p. il. ISBN: 978-85-7879-409-5 ISBN E-BOOK: 978-85-7879-410-1.
Discovery science in health over the past two decades has embraced, with considerable enthusiasm, the potential of two movements: precision medicine and the ascent of big data. Each of these developments has been suggested to hold substantial promise both to advance our health science and to lead to the development of approaches that can improve health.Precision medicine—emerging naturally from the Human Genome Project almost two decades ago—promises to use genomic and molecular approaches to identify the causes of disease particular to (...) individuals with the end of helping develop tailored treatments and interventions. This approach builds on what is perhaps a deeply held... (shrink)
We study the algebraic implications of the non-independence property and variants thereof on infinite fields, motivated by the conjecture that all such fields which are neither real closed nor separably closed admit a henselian valuation. Our results mainly focus on Hahn fields and build up on Will Johnson’s “The canonical topology on dp-minimal fields” :1850007, 2018).
In [F.-V. Kuhlmann, S. Kuhlmann, S. Shelah, Exponentiation in power series fields, Proc. Amer. Math. Soc. 125 3177–3183] it was shown that fields of generalized power series cannot admit an exponential function. In this paper, we construct fields of generalized power series with bounded support which admit an exponential. We give a natural definition of an exponential, which makes these fields into models of real exponentiation. The method allows us to construct for every κ regular uncountable cardinal, 2κ pairwise non-isomorphic (...) models of real exponentiation , but all isomorphic as ordered fields. Indeed, the 2κ exponentials constructed have pairwise distinct growth rates. This method relies on constructing lexicographic chains with many automorphisms. (shrink)
Given an ordered fieldK, we compute the natural valuation and skeleton of the ordered multiplicative group (K >0, ·, 1, <) in terms of those of the ordered additive group (K,+,0,<). We use this computation to provide necessary and sufficient conditions on the value groupv(K) and residue field $\bar K$ , for theL ∞ε-equivalence of the above mentioned groups. We then apply the results to exponential fields, and describev(K) in that case. Finally, ifK is countable or a power series field, (...) we derive necessary and sufficient conditions onv(K) and $\bar K$ forK to be exponential. In the countable case, we get a structure theorem forv(K). (shrink)
This paper discusses the dynamic interplay in the post-revolution era between external phenomena in organizations’ wider socio-cultural environment includingmaterialism, consumerism and ethics along with organizational practices (i.e. corporate social responsibility and cause-related marketing).
En este artículo me ocupo de la cuestión de cómo en las teorías de proceso dual se puede dar cuenta del autoengaño y su conexión con la racionalidad. Presento las versiones intencionalista y no intencionalista del autoengaño y muestro cómo el debate entre ellas puede dirimirse de manera más completa y satisfactoria en el marco de una teoría dual. En éste suelen aceptarse dos sistemas de razonamiento, uno heurístico y otro analítico, que compiten por el control de nuestras inferencias y (...) acciones, pero a veces interactúan y colaboran entre sí. Se defiende que si predomina la respuesta de S1, se puede ver el patrón del autoengaño como una forma de razonamiento heurístico y no únicamente como un vínculo causal. Se sugiere que las evaluaciones en cuanto a la racionalidad del proceso del autoengaño, dependerá del modo en que intervenga en el patrón de razonamiento y del sistema desde el cual se lleve a cabo. In this paper I discuss the phenomenon of self-deception and its connection with the notion of rationality linked to the dual process theories. I present the intentionalist and nonintentionalist accounts of self-deception and aim to show how the debate between them can be resolved in a more comprehensive and satisfactory manner, if it is placed in the frame of the dual process theories. The dual model usually accepts two kinds of reasoning processes, heuristic and analytic, referred to two different systems, S1 and S2. These processes compete for control of our inferences and actions, but sometimes they interact and collaborate. It is suggested that in a dual model, the evaluations in terms of the rationality of the process will depend on the way in which self-deception participates in the reasoning process and on the system from which the evaluation takes place. (shrink)
We explain how the field of logarithmic-exponential series constructed in 20 and 21 embeds as an exponential field in any field of exponential-logarithmic series constructed in 9, 6, and 13. On the other hand, we explain why no field of exponential-logarithmic series embeds in the field of logarithmic-exponential series. This clarifies why the two constructions are intrinsically different, in the sense that they produce non-isomorphic models of Thequation image; the elementary theory of the ordered field of real numbers, with the (...) exponential function and restricted analytic functions. (shrink)
The reign of the ῾Abbsid caliph al-Mu῾taṣim is usually recognized among historians for its military character with the recruitment of new Turkic troops, the foundation of Smarr᾿ as a new capital, and the campaign against ᾿Ammriyya. Chronicle accounts about al-Mu῾taṣim, however, also hold potential as a topic for narrative criticism. This article analyzes the little examined use of military history for literary and allusive purposes by medieval narrators. The overall accomplishments of al-Mu῾taṣim were dramatized in the classical texts within a (...) matrix of tensions that permeated his reign, including: the caliph's backing of the Miḥna while undertaking jihd against the Byzantines and the Khurramiyya, his sudden reversal for the fortunes of al-Afshn in spite of the latter's military skill, and the lingering mistrust between the ῾Alids and the ῾Abbsids, Persian officials and the Arab leadership. The article shows how the narratives of Ṭabar in particular display a careful construction which deployed these various dimensions as objects for readership reflection to varying degrees of criticism or support. (shrink)
This study explores the influence of ethics education on accounting students’ level of ethical reasoning in Tunisia. Based on cognitive developmental theory, we tested the effectiveness of an ethics intervention before and after ethics education with a control group. A triangulated research design was incorporated. Experimental and qualitative methods were used to control for experimental bias. This study revealed that the progress of moral development was not significant between the pre-test and the post-test. Data analysis revealed the primary challenges in (...) teaching ethics in the Tunisian audit context. Through a confirmatory qualitative survey, stating “the consequences of unethical behaviour in the long term” demonstrates that the intervention meets the primary interest of this study, and it may influence auditors’ decisions and their perceptions of the potential consequences of their decisions. (shrink)
For Wittgenstein, our rational und conceptual abilities ureparf of our nahuaI hisrory as a specie md are displuyed in most social practices. lñis essoy takes a look inro this idea andreldes it to the problem of comcience and opiriion.