In this paper we show that the class of fork squares has a complete orthodox axiomatization in fork arrow logic (FAL). This result may be seen as an orthodox counterpart of Venema's non-orthodox axiomatization for the class of squares in arrow logic. FAL is the modal logic of fork algebras (FAs) just as arrow logic is the modal logic of relation algebras (RAs). FAs extend RAs by a binary fork operator and are axiomatized by adding three equations to RAs equational (...) axiomatization. A proper FA is an algebra of relations where the fork is induced by an injective operation coding pair formation. In contrast to RAs, FAs are representable by proper ones and their equational theory has the expressive power of full first-order logic. A square semantics (the set of arrows is U×U for some set U) for arrow logic was defined by Y. Venema. Due to the negative results about the finite axiomatizability of representable RAs, Venema provided a non-orthodox finite axiomatization for arrow logic by adding a new rule governing the applications of a difference operator. We address here the question of extending the type of relational structures to define orthodox axiomatizations for the class of squares. Given the connections between this problem and the finitization problem addressed by I. Németi, we suspect that this cannot be done by using only logical operations. The modal version of the FA equations provides an orthodox axiomatization for FAL which is complete in view of the representability of FAs. Here we review this result and carry it further to prove that this orthodox axiomatization for FAL also axiomatizes the class of fork squares. (shrink)

In this paper we show that the class of fork squares has a complete orthodox axiomatization in fork arrow logic (FAL). This result may be seen as an orthodox counterpart of Venema's non-orthodox axiomatization for the class of squares in arrow logic. FAL is the modal logic of fork algebras (FAs) just as arrow logic is the modal logic of relation algebras (RAs). FAs extend RAs by a binary fork operator and are axiomatized by adding three equations to RAs equational (...) axiomatization. A proper FA is an algebra of relations where the fork is induced by an injective operation coding pair formation. In contrast to RAs, FAs are representable by proper ones and their equational theory has the expressive power of full first-order logic. A square semantics (the set of arrows is ᵎ x ᵎ for some set ᵎ) for arrow logic was defined by Y. Venema. Due to the negative results about the finite axiomatizability of representable RAs, Venema provided a non-orthodox finite axiomatization for arrow logic by adding a new rule governing the applications of a difference operator. We address here the question of extending the type of relational structures to define orthodox axiomatizations for the class of squares. Given the connections between this problem and the finitization problem addressed by I. Németi, we suspect that this cannot be done by using only logical operations. The modal version of the FA equations provides an orthodox axiomatization for FAL which is complete in view of the representability of FAs. Here we review this result and carry it further to prove that this orthodox axiomatization for FAL also axiomatizes the class of fork squares. (shrink)

The aim of this work is twofold. First, we survey the techniques developed in Perthame and Zubelli (Inverse Probl 23(3):1037–1052, 2007 ), Doumic et al. (Inverse Probl 25, 2009 ) to reconstruct the division (birth) rate from the cell volume distribution data in certain structured population structured population models. Secondly, we implement such techniques on experimental cell volume distributions available in the literature so as to validate the theoretical and numerical results. As a proof of concept, we use the experimental (...) data experimental data reported in the classical work of Kubitschek (Biophys J 9(6):792–809, 1969 ) concerning Escherichia coli in vitro experiments measured by means of a Coulter transducer-multichannel analyzer system (Coulter Electronics, Inc., Hialeah, FL, USA). Despite the rather old measurement technology, the reconstructed division rates still display potentially useful biological features. (shrink)

We compare fork arrow logic, an extension of arrow logic, and its natural first-order counterpart (the correspondence language) and show that both have the same expressive power. Arrow logic is a modal logic for reasoning about arrow structures, its expressive power is limited to a bounded fragment of first-order logic. Fork arrow logic is obtained by adding to arrow logic the fork modality (related to parallelism and synchronization). As a result, fork arrow logic attains the expressive power of its first-order (...) correspondence language, so both can express the same input–output behavior of processes. (shrink)

When visual attention is directed away from a stimulus, neural processing is weak and strength and precision of sensory data decreases. From a computational perspective, in such situations observers should give more weight to prior expectations in order to behave optimally during a discrimination task. Here we test a signal detection theoretic model that counter-intuitively predicts subjects will do just the opposite in a discrimination task with two stimuli, one attended and one unattended: when subjects are probed to discriminate the (...) unattended stimulus, they rely less on prior information about the probed stimulus’ identity. The model is in part inspired by recent findings that attention reduces trial-by-trial variability of the neuronal population response and that they use a common criterion for attended and unattended trials. In five different visual discrimination experiments, when attention was directed away from the target stimulus, subjects did not adjust their response bias in reaction to a change in stimulus presentation frequency despite being fully informed and despite the presence of performance feedback and monetary and social incentives. This indicates that subjects did not rely more on the priors under conditions of inattention as would be predicted by a Bayes-optimal observer model. These results inform and constrain future models of Bayesian inference in the human brain. (shrink)

LUBENOW, Jorge A. A categoria de esfera pública em Jürgen Habermas: para uma reconstrução da autocrítica. João Pessoa: Editora Manufatura, 2012. 158 p. Resumo: Jorge Lubenow trabalha atualmente na Universidade Federal da Paraíba e é um dos representantes da nova e confiante geração de estudiosos da obra de Habermas, que perfaz em pouco tempo uma carreira acadêmica bem sucedida. Este livro foi sua tese de doutorado, defendida na Unicamp em 2007, após período de pesquisa na Alemanha, sob orientação (...) de dois importantes intelectuais nos dois países. O livro é dedicado ao próprio Habermas, o que se justifica pela imperdível efeméride: em 2012, ano da publicação do livro aqui resenhado, completa 50 anos a tese de Habermas que foi o objeto de estudo de Lubenow: Mudança estrutural da esfera pública. Eis um jovem filósofo brasileiro a retomar, de maneira cuidadosa e segura, a obra determinante daquele alemão, que cuidou de reconstruir a história (e um pouco da sociologia) da formação e da decadência da esfera pública burguesa. Habermas tinha 32 anos quando defendeu em Marburg uma tese antes recusada em Frankfurt. Data de registro: 22/11/2012 Data de aceite: 19/06/2013. (shrink)

I De las muchas cosas que lleva ya escritas Jorge Riechmann sobre problemas sustantivos relacionados con la crisis ecológica, la última publicada, Cuidar la T(t)ierra, es seguramente la más notable. Y, sin duda, es la aportación más sugerente que ha aparecido por estos pagos al concepto de sostenibilidad y a su práctica en el mundo actual. Se trata de un libro de más seiscientas páginas en el que el lector atento apreciará un montón de cosas que sólo excepcionalmente suelen (...) darse juntas: la .. (shrink)

ABSTRACTPeer action coordination has been often studied in terms of its underlying cognitive mechanisms, and little is known about its emotional processes. The aim of the present study was to inves...

UnoTal como lo destaca Antonio Elizalde en la presentación del libro “Ampliando el Arco Iris”, escrito por varias manos, mentes y corazones, el Arco Iris ya parece una serie o una saga, para usar una palabra con más historia y más fina, acorde con la riqueza editorial de una obra que ya llega a la tercera versión. El primer libro, publicado en 1988, hubo de llamarse La Fuerza del Arco Iris, muy a tono con un Chile que en esos años (...) desplegaba una acción social que quería apurar el alba luego d.. (shrink)

The idea that natural selection acts on many levels—and not only at the level of organisms or individual genes—is increasingly accepted among biologists. However, it is not easy to reconcile this idea with the strictly “individualistic” conception of the evolutionary process that has always characterized Darwinian thought. Moreover, the individuality of some forms of life is a vague concept and therefore controversial. This is the case of Candidatus Magnetoglobus multicellularis, whose discovery immediately inspired the following question: Does the concept of (...) individuality have degrees? Alternatively, how far is this structure of prokaryotic cells from deserving to be called an organism? In this article, we propose a new conceptual scheme based on an idea of individuality that is not limited to organisms and that makes sense in terms of Darwinian evolution. In this conceptual scheme, selection at levels above that of the individual organism is interpreted as the evolutionary emergence of higher-level individuality. This proposal may serve as a basis on which to construct a promising hierarchical evolutionary theory. (shrink)

The idea that natural selection acts on many levels—and not only at the level of organisms or individual genes—is increasingly accepted among biologists. However, it is not easy to reconcile this idea with the strictly “individualistic” conception of the evolutionary process that has always characterized Darwinian thought. Moreover, the individuality of some forms of life is a vague concept and therefore controversial. This is the case of Candidatus Magnetoglobus multicellularis, whose discovery immediately inspired the following question: Does the concept of (...) individuality have degrees? Alternatively, how far is this structure of prokaryotic cells from deserving to be called an organism? In this article, we propose a new conceptual scheme based on an idea of individuality that is not limited to organisms and that makes sense in terms of Darwinian evolution. In this conceptual scheme, selection at levels above that of the individual organism is interpreted as the evolutionary emergence of higher-level individuality. This proposal may serve as a basis on which to construct a promising hierarchical evolutionary theory. (shrink)

La emancipación de las colonias latinoamericanas fue un proceso que tuvo la influencia directa del liberalismo europeo, cuyo contenido ideológico formó parte primordial de la base que sirvió para organizar los Estados, los regímenes políticos y la construcción civil de estas jóvenes naciones. Sin embargo, este pensamiento se desarrolló de manera diferente y tuvo adaptaciones diversas en cada una de ellas, debido a que poseían necesidades y realidades diferentes.Pues bien, este tema correspond..

Attitudinal- and stress theory are used to investigate the effect of ethical climate on job outcomes. Responses from 208 service employees who work for a country health department were used to test a structural model that examines the process through which ethical climate (EC) affects turnover intention (TI). This study shows that the EC–TI relationship is fully mediated by role stress (RC), interpersonal conflict (IC), emotional exhaustion (EE), trust in supervisor (TS), and job satisfaction (JS). Results show that EC reduces (...) (RS) and increases TS. Lower stress levels result in lower EE, higher JS, and lower TI. Also, supervisor trust (TS) reduces IC and EE. The structural model predicts 53.9% of the variance of TI. (shrink)

Leaders play a critical role in setting the tone for ethical climate in organizations. In recent years, there has been an increased skepticism about the role played by corporate executives in developing and implementing ethics in business practices. Sales and marketing practices of businesses, particularly in the pharmaceutical industry, have come under increased scrutiny. This study identifies a type of leadership style that can help firms develop an ethical climate. Responses from 333 salespeople working for a North American subsidiary of (...) an international pharmaceutical company were used to analyze the impact of instrumental leadership on ethical climate. We also examined the effect of ethical climate on effort, satisfaction with the supervisor, and job satisfaction. Managerial implications are provided. (shrink)

Enseñan los estudiosos del Talmud que los Profetas no profetizan en contra de algo que acontecerá de modo inexorable. Por el contrario lo hacen en contra de algo que sucederá si no somos capaces de rectificar el rumbo de nuestras vidas. Rectificar el rumbo mientras sea posible, recuperar la realidad, recuperar la vida de todos como condición indispensable de posibilidad y racionalidad de cualquier forma de existencia social, es el llamado secularmente profético que formula Franz Hinkelammert ..

This paper has two main objectives. The first one is to reflect on the validity of data in analysis and projections that underpin the engineering asset management of organizations, considering, on the one hand, a certain resistance or even inadequate use of data and information of a subjective nature and; on the other hand, a consolidated reliance on quantitative approaches and decisions based on data series. The second objective is to contextualize the applicability of combining qualitative data based on experts’ (...) experience and on the tacit knowledge built in organizations, with approaches based essentially on quantitative data, according to the data availability and the decision scenario over the asset life cycle. We present two application of an approach combining quali and quanti data. One example interrelates Statistics with Psychology and the other combines elicitated data about asset indicators with parameters deterministically calculated. Both applications aiming at providing more realistic indicators and supporting the Asset Management process to make more assertive decisions. (shrink)

Para un historiador, el contar, escribir o investigar le implica un viaje por el tiempo hacia el pasado, para el cual utiliza como medios de transporte diversos tipos de fuentes que le ayudan a aproximarse a diversos episodios de épocas pretéritas. Aunque esto se lea como algo bastante obvio, una buena parte de ellos optan por privilegiar los documentos para su travesía, siendo pocos los que acuden a la memoria y a las experiencias personales de otras personas con la idea (...) de recurrir al testi.. (shrink)

Durante las últimas décadas, el análisis de los procesos de integración regional ha sido materia de especial interés para numerosos estudiosos de las relaciones internacionales. Entre las distintas visiones que se han enfocado en esta esfera, especialmente destacables resultan el funcionalismo, desde cuya perspectiva los estudios de David Mitrany resultan especialmente importantes; el neofuncionalismo de Ernst Haas y Philippe Schmiter; y el análisis de Karl Deutsch, desde el punto de vista d..

Es difícil reseñar una obra de tan larga extensión. Se corre el riesgo de dejar cuestiones fundamentales fuera de este breve comentario. El extenso volumen en comento comprende una selección de distintos textos de la Comisión Económica Para América Latina y el Caribe (CEPAL), publicados entre 1998 y 2008. El libro fue realizado en el marco de la conmemoración de los sesenta años de la institución, el año 2008, complementando otra extensa compilación publicada en 1998, con motivo de los cincue..

El presente libro constituye una interesante propuesta para enfrentar el estudio del pasado de una manera distinta a la historiografía tradicional, a la cual se la ha criticado muchas veces por su escritura compleja y por la escasa empatía que las investigaciones generan con el lector que no es especialista en este tipo de conocimientos. Es por esto que, y al igual que lo realizado en XIX Historias del siglo diecinueve chileno, los autores del texto presentan una serie de artículos (...) en los que.. (shrink)

Con la publicación de En torno a lo político, Mouffe instala su lectura de lo político y la democracia en la problemática de la política mundial del nuevo milenio. Preocupada principalmente por las posibilidades abiertas para la estructuración de un orden mundial único –posibilidades celebradas por una vasta corriente intelectual de corte liberal y progresista– y por la emergencia de una derecha populista en varios países europeos, se propone hacer una crítica a la base política que ha propic..

Peter Burke, uno de los historiadores de la cultura más notables de las últimas décadas, nos entrega en este texto, un ensayo teórico iluminador y sugerente en torno a uno de los fenómenos frecuentemente analizados en estos tiempos de globalización: el hibridismo cultural.Antes de referirnos a la arquitectura conceptual de este magnífico ensayo teórico es necesario hacer una referencia al estudio preliminar realizado por la profesora María José del Río Barredo para la edición en español de..

Frecuentemente, los historiadores sitúan sus investigaciones en torno a una serie de límites, tales como un cierto número de años, algún período histórico en particular, las fronteras naturales de una comuna, provincia, región, o país, entre muchos otros. Esta técnica se usa con el objeto de abordar y profundizar de mayor y mejor manera los temas que en los trabajos se recogen, lo que provoca que todo lo que queda fuera del tema estudiado se deje de lado, o se mencione (...) de manera mínima en alg.. (shrink)

En el presente libro, Carlos Molina centra su análisis en el desarrollo y la evolución histórica que tuvieron las instituciones sanitarias en nuestro país desde finales del siglo XIX hasta la actualidad, ya que busca comprender las maneras en que el Estado chileno ha respondido a las necesidades y problemas de salud de la sociedad. Para abordar estos temas, el autor se remonta a 1889, año en que el Estado comenzó a intervenir de una manera más directa en esta materia (...) gracias a la creación del.. (shrink)

“Resistir significa en primer lugar rechazar. Hoy, la insurgencia consiste en ese rechazo que no tiene nada de negativo, que es un acto indispensable, vital “ V. F.Hace ya seis años, en 1997, dos importantes editoriales publicaron en Barcelona, México y Buenos Aires, una traducción al español de El horror económico, y tres años después apareció en nuestra lengua Una extraña dictadura, ambos de la destacada ensayista y novelista francesa Vivianne Forrester. Estas obras se convirtieron en éxit..