Standard adaptive control is the preferred approach for stabilization and synchronization of chaotic systems when the structure of such systems is a priori known but the parameters are unknown. However, in the presence of unmodeled dynamics and/or disturbance, this approach is not effective anymore due to the drift of the parameter estimations, which eventually causes the instability of the closed-loop system. In this paper, a robustifying term, which consists of a saturation function, is used to avoid this problem. The robustifying (...) term is added to the adaptive control law. Consequently, the learning law is also modified. The boundedness of the states and the parameter estimations is rigorously and thoroughly proven by means of Lyapunov like analysis based on Barbalat’s lemma. On these new conditions, the convergence to zero cannot be achieved due to the presence of unmodeled dynamics and/or disturbance. However, it is still possible to guarantee the asymptotic convergence to a bounded zone around zero. The width of this zone can be adjusted by the designer. The performance of this robust approach is verified by numerical simulations. Although, for simplicity, this strategy is only applied to the stabilization and synchronization of Zhang system, the procedure can easily be generalized to a broad class of chaotic systems. (shrink)

In this note, the problem of tracking random references and rejecting random perturbations in a quadrotor, both generated by an auxiliary system named exosystem, is solved by extending the deterministic tracking problem to the area of stochastic processes. Besides, it is considered that only a part of the state vector of the quadrotor is available through measurements. As a consequence, the state vector of the plant must be estimated in order to close the control loop. On this basis, a controller (...) to track random references and to reject random perturbations is developed by combining a Kalman filter to estimate the references and perturbations of an exosystem and an observer to estimate the states of a quadrotor. Besides, to obtain a more practical controller, the analysis is carried out in discrete time. Numerical simulations are used in a quadrotor to confirm the validity and effectiveness of the proposed control. (shrink)

ABSTRACT Educating in a convulsed political context demands a detailed analysis of the new circumstances of our times, especially the current democracy crisis. According to the latest reports issued by international evaluation organisations, one of the greatest challenges for democratic citizenship is the emergence and rise of authoritarianism within the framework of the so-called post-democracy, and also in the manifestations known as illiberal democracy. Moral and civic education has to respond to this challenge. With this in mind, we propose revitalising (...) a participative and deliberative democracy model, rethinking the basic values in citizens' education, redefining the relation between what is public and what is private, and empowering sensitivity and free creation in the new maker culture. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Creativity Belongs to the Person, not to DiseaseJuan J. López-Ibor Jr. (bio) and María-Inés López-Ibor (bio)Keywordscreativity, patho-biography, Saint Teresa, visionsIn the paper, “From the Visions of Saint Teresa of Jesus to the Voices of Schizophrenia,” Cangas, Sass, and Pérez-Álvarez (2008) take an original approach to patho-biography that is very welcome.The temptation to designate historical individuals or characters of fiction as suffering from mental disease has always produced disagreeable (...) feelings in me. This sort of abuse of psychiatry and of the people in question is parallel to the abuse by the media or lay citizens when they describe, say, an especially violent murderer as a schizophrenic—forgetting that the vast majority of people with schizophrenia are not in the least violent. Having read Santa Teresa’s writings during my adolescence, well before I even considered entering medicine, I reacted to comments about her alleged psychiatric illnesses with uneasiness, to put it mildly. The Santa Teresa of La Vida de la Santa Madre Teresa de Jesús (her autobiography), of the Camino de Perfección, and of the El Castillo Interior was surely not a mental patient, it seemed to me. The same would apply to San Juan de La Cruz, Jean D’Arc, Don Quijote, Sancho Panza, Edipus, and Clitemnestra, to mention a few. Even van Gogh’s paintings did not seem to me the productions of a patient with schizophrenia or epilepsy. Of course all of them may have suffered, at certain periods of life, symptoms attributable to a mental disorder, but their creativity rested elsewhere, and was often manifest during healthy periods of their lives. After years spent fighting the stigma of mental diseases, and after organizing several exhibitions of works of art of people with mental diseases, we came to the conclusion that creativity and singularity belong to the person, not to the illness. Some of the diseases of these individuals may have being accidents (van Gogh’s hallucinations and psychotic symptoms, for example, were most probably due to intoxications with absinthe, then rich in hallucinogenic alkaloids such as tujone), or, together with other life circumstances, may have had unspecific influences on the person’s condition. In contrast with many other psychiatric disorders that are represented in ancient Greek and Roman literature, there are no descriptions of individuals with schizophrenia in the Greek and Roman literature dating from the fifth century bc to the beginning of the second century Ad (Evans et al. 2003), and several authors have speculated that schizophrenia did not exist before the eighteenth century (Ellard 1987).Caution is important when dealing with mental health and religious issues in contrast with creativity. The creativity of people suffering from bipolar disorders is well recognized (Jamison 1993) and [End Page 277] the same applies to alcohol and drug intoxication. Tellenbach (1986) has also written on the creativity of depressed persons, although he refers more to the disposition of mood (Schwermut) than to clinical depression as such. The link between melancholia and genius put forward by Aristotle has often been misinterpreted. The philosopher was considering the melancholic temperament and not the melancholic illness as we would understand it today. Of the four temperaments, it is in his view only the melancholic that is gifted with creativity. The sanguine person seeks the immediate pleasures of life, the choleric one considers himself powerful and dedicates himself to manifesting this power, and the phlegmatic individual is disconnected from life and seeks to live without effort or pleasure. The melancholic temperament leads to creativity because of the predominance of doubt, reflection, and dissatisfaction with the miseries of life.Freud’s notion of religiosity as a collective obsessive neurosis is totally mistaken, in my view. The three main themes of obsessions are cleanliness, order, and guilt. In none of these cases is the theme the goal of the action; rather, it is a strategy to contain anxiety. As a consequence, patients with obsessions and compulsions about dirt and cleanliness tend to be dirty themselves, because the real purpose of their compulsions is not in fact to be clean but rather to satisfy a ritual. When order... (shrink)

La parada cardiorrespiratoria (PCR) es una de las principales causas de muerte en los países industrializados. La reanimación cardiopulmonar (RCP) por testigos aumenta la supervivencia pero no hay formación en RCP en España en el sistema educativo.Este trabajo analiza la implementación de un programa de formación para profesores de Educación Secundaria por parte de sanitarios y, posteriormente, la adquisición de competencias por parte del alumnado comparando según el docente que los ha formado (profesor/a o sanitario), en un instituto de Granada (...) (España), objetivando una adquisición de competencias adecuada a todos los niveles y mejor cuando el docente es profesor/a. (shrink)

Wakandan women can play stereotypically male roles because of the political construction of Wakandan identity. Wakandan women emerge, for starters, in a radically different cultural context than women of color in other countries and cultures. Despite their tacit representation of feminist ideals, Wakandan women resist the full‐throated feminism we associate with the modern era: the no‐husband, no‐children feminism championed by the French philosopher Simone de Beauvoir. In 1966 Black Panther, the Marvel comic superhero, made his debut during the height of (...) second‐wave feminism. Back in Wakanda, M'Baku's renouncement of Shuri's non‐domestic activities makes an implicit appeal to the feminine mystique. Recognizing feminist and womanist elements within Wakanda helps explain the masculine and feminine performances of Wakandan women. Demystifying Wakanda requires us to recognize and reckon with The Panther Mystique : uncoerced appropriations of masculine and feminine norms for the sake of collective, communal freedom. (shrink)

The evolutionary implications of environmental change due to organismic action remain a controversial issue, after a decades—long debate on the subject. Much of this debate has been conducted in qualitative fashion, despite the availability of mathematical models for organism–environment interactions, and for gene frequencies when allele fitness can be related to exploitation of a particular environmental resource. In this article we focus on representative models dealing with niche construction, ecosystem engineering, the Gaia Hypothesis and community interactions of Lotka–Volterra type, and (...) show that their quantitative character helps bring into sharper focus the similarities and differences among their respective theoretical contexts. (shrink)

Variations in levels of apolipoprotein E have been tied to the risk and progression of Alzheimer's disease . Our group has previously compared and contrasted the promoters of the mouse and human ApoE gene promoter sequences and found notable similarities and significant differences that suggest the importance of the APOE promoter's role in the human disease. We examine here three specific single-nucleotide polymorphisms within the human APOE promoter region, specifically at -491 , -427 , and at -219 upstream from the (...) +1 transcription start site. The -219 and -491 polymorphic variations have significant association with instance of AD, and -491AA has significant risk even when stratified for the APOEepsilon4 allele. We also show significant effects on reporter gene expression in neuronal cell cultures, and, notably, these effects are modified by species origin of the cells. The -491 and -219 polymorphisms may have an interactive effect in addition to any independent activity. DNA-protein interactions differ between each polymorphic state. We propose SP1 and GATA as candidates for regulatory control of the -491 and -219 polymorphic sites. This work's significance lies in drawing connection among APOE promoter polymorphisms' associations with AD to functional promoter activity differences and specific changes in DNA-protein interactions in cell culture-based assays. Taken together, these results suggest that APOE expression levels are a risk factor for AD irrespective of APOEepsilon4 allele status. (shrink)

A derivação da religião como fruto da moralidade, a descrição de deveres como comandos divinos, o conceito de comunidade ética, podem, à primeira vista, credenciar a ideia de que o princípio kantiano de autonomia moral não seria tão forte quanto pretende, de que não incluiria, em particular, a noção de soberania individual na aplicação da lei moral. uma análise mais detida, entretanto, da concepção kantiana de religião e da concepção, simples e direta, da natureza do dever, indica a força da (...) autonomia como princípio, não apenas da razão prática como da razão em geral. (shrink)

En el presente trabajo se propone un estudio comparativo de las producciones de algunos referentes de la Investigación Participativa. Se revisan algunos de los textos de Orlando Fals Borda, Paulo Freire, João Bosco Guedes Pinto, Michel Thiollent, María Teresa Sirvent y Joel Martí. Este trabajo se inscribe en el proceso reciente de transformación universitaria en Uruguay, en particular, en una de sus iniciativas: la de la integración curricular de la extensión a través de lo que se ha denominado “prácticas universitarias (...) integrales”. En este marco, la reflexión teórico-metodológica sobre la extensión crítica y las prácticas de investigación-acción conectadas con ella resultan fundamentales para dotar las iniciativas en curso de mayor pertinencia académica y potencial transformador. (shrink)

"Knowing how we know" is the subject of this book. Its authors present a new view of cognition that has important social and ethical implications, for, they assert, the only world we humans can have is the one we create together through the actions of our coexistence. Written for a general audience as well as for students, scholars, and scientists and abundantly illustrated with examples from biology, linguistics, and new social and cultural phenomena, this revised edition includes a new afterword (...) by Dr. Varela, in which he discusses the effect the book has had in the years since its first publication. (shrink)

The multiobjective optimization on the basis of ratio analysis method captures diverse features such as the criteria and alternatives of appraising a multiple criteria decision-making problem. At the same time, the multiple criteria problem includes a set of decision makers with diverse expertise and preferences. In fact, the literature lists numerous approaches to aid in this problematic task of choosing the best alternative. Nevertheless, in the MCDM field, there is a challenge regarding intangible information which is commonly involved in multiple (...) criteria decision-making problem; hence, it is substantial in order to advance beyond the research related to this field. Thus, the objective of this paper is to present a fused method between multiobjective optimization on the basis of ratio analysis and Pythagorean fuzzy sets for the choice of an alternative. Besides, multiobjective optimization on the basis of ratio analysis is utilized to choose the best alternatives. Finally, two decision-making problems are applied to illustrate the feasibility and practicality of the proposed method. (shrink)

El objetivo de la investigación fue realizar un análisis de la capacidad de empatía en 178 adolescentes de 14 a 17 años que cursan el último ciclo de Educación Básica Regular. Se aplicó el diseño convergente. En la primera etapa, se aplicó una lista de cotejo, y en la segunda, una entrevista semiestructurada. El estudio de tipo transeccional sincrónico-descriptivo, permitió reportar que el adolescente, durante la pandemia, es empático, consciente de la posibilidad de infectarse, cree que su cuidado y autoprotección (...) impedirán que se infecte, sufre con el dolor de los otros a quienes los acompaña. (shrink)

El duelo es un proceso psicológico duro de sobrellevar ante la muerte por la aparición del Covid-19 en el Perú. Cuando las personas infectadas morían a consecuencia de la infección, eran incineradas por cuenta del hospital, y a los familiares se les entregaba una caja pequeña en la que se les decía que estaban las cenizas de su difunto. Las entrevistas realizadas a niños de 11 años de edad, padres de familia y psicólogos de hospitales; revelaron cuadros de ansiedad o (...) angustia, debido al temor generalizado. Los factores de protección social y escolar fueron poco sostenibles para sobrellevar la pena. (shrink)

El presente texto se inscribe dentro de la temática dirigida a la investigación sobre la violencia intrafamiliar. Tiene como objetivo sistematizar aspectos históricos y teóricos inherentes al estudio del maltrato infantil y sus consecuencias en el ámbito social y familiar para su detección y tratamiento en el nivel de atención primaria de los servicios de salud en Cuba. Mediante una revisión bibliográfica se logró concretar un análisis documental de materiales y textos en soporte digital e impreso que condujo a los (...) acercamientos teórico e histórico del fenómeno en el ámbito internacional y nacional, para su conceptualización, la determinación de su tipología y el establecimiento de sus consecuencias; elementos imprescindibles del saber profesional del futuro egresado de las ciencias médicas, en función de su desempeño en los diferentes niveles de atención de salud, en especial, la atención primaria. The text falls within the research on intrafamiliar violence subject matter. Its objective is to systematize historical and theoretical aspects inherent to the study of child abuse and its consequences within the social and domestic scopes for its detection and treatment in the Cuban primary health care services. By means of a bibliographic review, a documentary analysis of electronic and printed form materials and texts was summarized. It led to theoretical and historical approaches to the phenomenon within the national and international scopes for its conceptualization, the establishment of its typology and consequences. They are essential elements of the professional knowledge of future medical sciences graduates towards their performance in different health care levels, especially in primary health care. (shrink)

We give $A_p$ type conditions which are sufficient for two-weight, strong $$ inequalities for Calderón-Zygmund operators, commutators, and the Littlewood-Paley square function $g^*_\lambda $. Our results extend earlier work on weak $$ inequalities in [13].

Although entrepreneurial intention has been widely studied using cognitive models, we still lack entrepreneurial vocation and, therefore, lack disruptive innovations. Entrepreneurship scholars have some understanding of the reasons underlying this weakness, although there is much room for improvement in our learning concerning how to promote entrepreneurship among university students, especially in the transformed context of digital technologies. This paper focuses on the early stages of start-up, and in particular seeks to evaluate what role social and psychological factors play in the (...) development of entrepreneurial intentions. Drawing on network theory, we consider the impact of social networks on entrepreneurial intention. Specifically, we analyze the influence of two types of social networks: face-to-face and online social networks, with the latter proving especially important in digital transformations. In addition, based on affective congruency theory, we relate affect with entrepreneurial intention. Particularly, we evaluate the influence of positive and negative dispositional affectivity on the formation of entrepreneurial intentions. Finally, since affect and emotions can also be related with social relationships, we analyze whether dispositional affectivities influence entrepreneurial intention through the mediation effect of social networks. Using structural equation modeling, we confirm the impact of both online and face-to-face social networks, as well as positive dispositional affectivity on entrepreneurial intention for 589 higher education students in Spain. However, negative dispositional affectivity is not seen to influence entrepreneurial intention. Furthermore, both face-to-face and online social networks are influenced by positive dispositional affectivity. Moreover, these two types of networks can even partially mediate the relationship between positive dispositional affectivity and entrepreneurial intention. Positive dispositional affectivity can thus influence entrepreneurial intention in two different ways: directly and indirectly through both face-to-face and online social networks. This study provides further insights and adds to the literature on affect, social networks, and entrepreneurial intention. From a broader perspective, we also contribute to the literature on disruptive innovations by explaining how the development of entrepreneurial intentions would have positive consequences for university students vis-à-vis achieving these disruptive innovations. (shrink)

We seek to add to the Corporate Social Responsibility (CSR) and Sustainable Development (SD) literature through the empirical study of Latin American firm membership in the United Nations Global Compact (GC) and Global Report Initiative (GRI). Within an institutional-based framework, we explore through three filters – commercial, state-signaling, and distinguished peers – the impact of normative and mimetic pressures associated with GC/gri membership. Our sample includes 207 public firms from six Latin American countries (Argentina, Brazil, Chile, Colombia, Mexico, and Peru). (...) Our results suggest Latin American firms from countries with a greater European influence (normative pressure) are twice as likely to be enrolled in the GC/gri. Additionally, we find that Latin American firms listed on the NYSE (mimetic pressure) are also twice as likely to sign up under the GC/gri. Hence, the normative and mimetic pillars of institutional theory are found to be significant factors for Latin American firms adopting sustainability initiatives. (shrink)

Durante su desarrollo el niño se enfrenta a eventos que plantean demandas difíciles de satisfacer como la enfermedad y la hospitalización. La Organización Mundial de Salud define la salud como un estado de completo bienestar físico, mental y social, pero no existe consenso en la literatura sobre el término bienestar. El objetivo del artículo es realizar una revisión bibliográfica acerca del concepto bienestar en niños, asociado al proceso salud - enfermedad y a la hospitalización. Los niños experimentan bienestar cuando predominan (...) sus emociones positivas, estas favorecen la salud, las negativas, pueden provocar estados patológicos y son frecuentes en la hospitalización. Esa realidad amerita ser transformada. El bienestar en niños hospitalizados constituye un reto para las ciencias médicas para penetrar las bases del nivel secundario de atención. Throughout their development, children face events that pose hard-to-satisfy demands for them such as illness and hospitalization. The World Health Organization defines health as a state of complete physical, mental, or social well-being; however, there is no consensus in literature about the term "well-being". The objective of the article is to do a bibliographic review on the concept of children well-being associated to the health-illness process and to hospitalization. Children experience the state of well-being when positive emotions, which favor health, prevail. Negative feelings, on the other hand, can cause pathological states and they are common in hospitalization. That reality merits transformation. Hospitalized children's well-being presents a challenge for medical sciences in order to get inside the basis of secondary health care attention. (shrink)

Este estudio pretende demostrar el origen metodológico común del concepto de soberanía popular de Rousseau y Carl Schmitt, entendido como aquella autoridad política cuya legitimidad descansa en un principio democrático verdaderamente sustantivo. En primer lugar, se intentará probar cómo ambas obras serían la expresión de una común reacción al formalismo de una dogmática liberal que identifica metodológicamente la legalidad formal con la legitimidad política. Así, Rousseau critica un enunciado de la ley natural procedente de Locke que legitima la desigualdad social (...) y política y justifica el gobierno burgués de los propietarios y Schmitt cuestiona un positivismo jurídico cuyo normativismo habría ocultado el auténtico valor sociológico del poder y la soberanía. En segundo lugar, una vez avanzada una crítica de las representaciones políticas que niegan el carácter sustantivo del pueblo soberano, se estudia el modo en que ambos formulan una propuesta metodológica alternativa. Aquí se prestará especial atención al modo en que la elaboración schmittiana incorpora, en un contexto de crisis de las formas liberales, una reelaboración de la crítica de Rousseau. (shrink)

The geometric system of deduction called N-Graphs was introduced by de Oliveira in 2001. The proofs in this system are represented by means of digraphs and, while its derivations are mostly based on Gentzen's sequent calculus, the system gets its inspiration from geometrically based systems, such as the Kneales' tables of development, Statman's proofs-as-graphs, Buss' logical flow graphs, and Girard's proof-nets. Given that all these geometric systems appeal to the classical symmetry between premises and conclusions, providing an intuitionistic version of (...) any of these is an interesting exercise in extending the range of applicability of the geometric system in question. In this article we produce an intuitionistic version of N-Graphs, based on Maehara's LJ' system, as described by Takeuti. Recall that LJ' has multiple conclusions in all but the essential intuitionistic rules, e.g., implication right and negation right. We show soundness and completeness of our intuitionistic N-Graphs with respect to LJ'. We also discuss how we expect to extend this work to a version of N-Graphs corresponding to the intuitionistic logic system FIL (Full Intuitionistic Logic) of de Paiva and Pereira and sketch future developments. (shrink)

This article inquires whether or not religious beliefs are rational, that is to say, whether or not they can be rationally sustained. The point of the article is not to prove the existence of God, but rather simply to show whether or not religious language has real meaning. To do this, we shall examine the concept of belief in general. Then we shall look at religious beliefs in particular from two opposing points of view: on the one hand, from the (...) position of authors who claim that religious beliefs can in fact be sustained by rational evidence, and on the other hand, from the perspective of other authors who affirm that these beliefs cannot be rationally justified, because spiritual discourse refers to the ineffable, which deprives it of the means to verify or deny its propositions. (shrink)

Review of: José Ferreirós. 2016. Mathematical knowledge and the interplay of practices. Princeton: Princeton University Press.

Background: This research explores how public awareness and attitudes toward donation and transplantation policies may contribute to Spain's success in cadaveric organ donation. Materials and Methods: A representative sample of 813 people residing in Andalusia (Southern Spain) were surveyed by telephone or via Internet between October and December 2018. Results: Most participants trust Spain's donation and transplantation system (93%) and wish to donate their organs after death (76%). Among donors, a majority have expressed their consent (59%), and few nondonors have (...) expressed their refusal (14%). Only a minority are aware of the presumed consent system in force (28%) and feel sufficiently informed regarding the requirements needed to be an organ donor (16%). Participants mainly consider that relatives should represent the deceased's preferences and be consulted when the deceased's wishes are unknown, as is the case in Spain. Conclusion: Public trust in the transplant system may contribute to Spain's high performance in organ donation. High levels of societal support toward organ donation and transplantation do not correspond with similar levels of public awareness of donation and transplantation policies in Spain. (shrink)

Il presente articolo ha come proprio oggetto specifico di indagine la questione dell’allattamento del bambino. L’autore si propone, più specificatamente, di sottolineare i vantaggi dell’allattamento naturale. Questi non si limitano a dei vantaggi per la salute del bambino, ma hanno anche una ricaduta psicologica sul rapporto madre-bambino.

Background: Doctor–patient sexual relationship is considered to be unfair because the first party would be abusing the second party’s vulnerability. The prohibition of this relationship is noted in the Hippocratic oath. Currently, a reprise of the use of oaths in medical schools can be observed.Aim: To determine whether the prohibition has been maintained and how its expression has varied in the oaths during different periods.Methods: 50 oaths were studied: 13 ancient–medieval and 37 modern–contemporary. Of the 50 texts, 19 were versions (...) of the original oaths. The oaths that pointed out the prohibited doctor–patient relationship referred to any sexual aspect or included paragraphs that began as the Hippocratic oath does were noted.Results: Of the 24 texts that expressed the prohibition, 8 were ancient–medieval and 16 were modern–contemporary. Some expressly call it Hippocratic oath, many use general terminology and others describe it in association with other commitments .Conclusions: The clause on the prohibition of the doctor–patient sexual relationship in Hippocratic oath was included to be for legal, economic and social reasons at the time. That the clause is found mostly in the ancient–medieval oaths can be attributed to the influence of the original. This commitment is generalised and associated with others by contemporary formulas. Currently, sexual relationships are the subject of legal and ethical analysis and their inclusion in the oaths is being debated. (shrink)