Much of the progress in the fields constituting cognitive science has been based upon the use of explicit information processing models, almost exclusively patterned after conventional serial computers. An extension of these ideas to massively parallel, connectionist models appears to offer a number of advantages. After a preliminary discussion, this paper introduces a general connectionist model and considers how it might be used in cognitive science. Among the issues addressed are: stability and noise‐sensitivity, distributed decision‐making, time and sequence problems, and (...) the representation of complex concepts. (shrink)

v. 1. Nicomachean ethics. Politics. The Athenian Constitution. Rhetoric. On Poetics.--v. 2. Logic.--v. 3. Physics. Metaphysics. On the soul. Short physical treaties.--v. 4. On the heavens. On generation and corruption. Meteorology. Biological treatises.

El libro de Herbert Marcuse Entre fenomenología y marxismo. Escritos filosóficos 1928-1933 viene a satisfacer la demanda de los lectores del autor de América latina, y de habla hispana en general, de tener una edición definitiva de sus trabajos de juventud. Marcuse nos había llegado como uno de los principales representantes del llamado marxismo heterodoxo del siglo XX. A su nombre habíamos asociado principalmente el proyecto de la Escuela de Frankfurt y la constitución de una teoría crítica de la sociedad; (...) el auge de los movimientos sociales de protesta de la generación del 68, la fundación de una nueva izquierda internacional, así como el análisis teórico sobre la dominación de las necesidades y deseos en las sociedades industriales avanzadas; los intentos por pensar la clase revolucionaria más allá del proletariado industrial y una original propuesta de lectura de la estructura históricosocial desarrollada por Marx en conjunto con la histórico-subjetiva desarrollada por Freud. Obras como Razón y revolución y El marxismo soviético, sentaron las bases para una nueva interpretación de la dialéctica de Hegel y de Marx y la denuncia de las formas esclerotizadas del marxismo en las directrices ideológicas de la Unión Soviética. (shrink)

In a recent re-assessment of the medical aspects of the Plague of Athens which is, to date, the most scholarly and comprehensive, Poole and Holladay have emphasized the tendency of many infectious diseases markedly to decline in virulence over decades and centuries and, sometimes, significantly to change their clinical manifestations. In the light of modern medicine they consider four possibilities: The Plague was a disease which still exists today. This they regard as improbable, It still exists in some remote place (...) or places unknown to medical science. This is discussed and dismissed, It became extinct, It was caused by an agent which nowadays causes a significantly different clinical syndrome. They conclude as follows: ‘The truth, we suggest, almost certainly lies in possibility or . But we can see no way of choosing between them. On either view the question: “What was the Athenian Plague?” is in principle unanswerable if the questioner is wanting to attach to the Plagsie the name of some modern disease or diseases’. (shrink)

MicroRNAs are non-coding parts of nuclear and mitochondrial genomes, preventing the weakest part of the genetic regulatory networks from being expressed and preventing the appearance of a too many attractors in these networks. They have also a great influence on the chromatin clock, which ensures the updating of the genetic regulatory networks. The post-transcriptional inhibitory activity by the microRNAs, which is partly unspecific, is due firstly to their possibly direct negative action during translation by hybridizing tRNAs, especially those inside the (...) mitochondrion, hence slowing mitochondrial respiration, and secondly to their action on a large number of putative m-RNA targets like those involved in immunetworks; We show that the circuits in the core of the interaction graphs are responsible for the small number of dedicated attractors that correspond to genetically controlled functions, partly due to a general filtering by the microRNAs. We analyze this influence as well as their impact on important functions like the control by the p53 network over the apoptosis/proliferation system and the homeostasis of the energy metabolism. In this last case, we show the role of two kinds of microRNAs, both involved in the control of the mitochondrial genome: (1) nuclear microRNAs, called mitoMirs, inhibiting mitochondrial genes and (2) putative mitochondrial microRNAs inhibiting the tRNAs functioning. (shrink)

As is well known, the law of parity conservation does not hold in weak interactions. This type of asymmetry created a number of theoretical problems which were solved, first of all, by a new understanding of the features of neutrinos and their role in weak interactions. These solutions were based, however, essentially on the handedness (chirality) of neutrinos which is closely related to their vanishing rest mass. The thesis of neutrinos with nonvanishing rest mass, newly considered in the literature, therefore (...) requires a rediscussion of the early arguments concerning the relation between the neutrino theory and some weak interaction essentials. When one does this, as in the present paper, it is noted that neutrinos with rest mass lead to some difficulties, in particular to a violation of T invariance. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:"And They Sang A New Song":Reading John's Revelation From The Position Of The LambJ.A. Jackson (bio) and Allen H. Redmon (bio)Then one of the elders said to me, "Do not weep. See, the Lion of the tribe of Judah, the Root of David, has conquered, so that he can open the scroll and the seven seals." Then I saw between the throne and the four living creatures and among (...) the elders a Lamb standing as if it had been slaughtered.—Revelation 5:5–6In an interview with Markus Müller, René Girard asserts the importance of taking into account the apocalypticism of Christianity. Apocalypse, Girard reminds us, "means revelation: apocalypto means to open up and to show the truth. But it also means absolute violence, so the apocalypse is a violent revelation and a revelation of violence" (Girard 1996). That the Revelation is a violent revelation has been well established. Despite textual evidence that would beg those who approach the text to do just the opposite, readers have fixated on the violence of the Revelation since its inception, finding in it God's final retribution against those who persecute the Church.1 Commentators such as Dennis E. Johnson, William Hendricksen, and George Elden Ladd have produced recent, full-length commentaries that champion the appearance of a Christ in Revelation ready to establish himself as a military champion and exact his revenge on those who persecute him (see, for example, Johnson 2001; Hendricksen 1998; and Ladd 1993). These accounts, and those that follow suit, are blinded by the violent revelation of John's apocalyptic narrative and fail to see the poem's revelation of violence—the other, prophetic half of what Girard rightly contends exists in Christian apocalypse.This error is understandable to some extent. Read in its own light and apart from the Gospel revelation as understood by those familiar with mimetic [End Page 99] theory, one has no hermeneutical principle for recognizing the end to which John is writing. The victims of the text can be ignored in the precise way that all victims are disregarded when the scapegoat mechanism functions properly. Such should not be the case in the Revelation, though, a text in which the scapegoat mechanism is exposed and pushed to its logical conclusions. John offers his reader a glimpse into the way this mechanism will function when all that is left is wall-to-wall violence, when one is left with only two alternatives: succumb to the mechanism and reciprocate its violence, or extricate oneself through nonreciprocation (and potentially die).In the margins of the violent revelation in John's apocalyptic vision, a revelation of violence emerges that can expose humankind's potential to annihilate itself and the mechanism with which it will do so. When read through the lens of mimetic theory, one discovers that John's narrative delivers a revelation of violence, an explicit naming and unmasking of the sacrificial mechanism that can capture for the reader not only the machinations of the sacrificial apparatus but one's own potential participation in it as well. As such, the poem can posit itself as a commandment (a Thou-shall-not-murder) that ultimately refuses the temptation to respond to violence in violence.The fact that John uses the apocalyptic to present this directive should not be surprising. Girard writes: "Only through the mediation of the scapegoat mechanism can violence become its own remedy, and the victimage mechanism can only be triggered by the frenetic paroxysm of the 'crisis.' This means that the violence, having lost its vitality and bite, will paradoxically be more terrible than before its decline. As the whole of humanity makes the vain effort to reinstate its reconciliatory and sacrificial virtues, this violence will without doubt tend to multiply its victims, just as happened in the time of the prophets" (Girard 1978, 195–96). While Girard's commentary on biblical eschatology and apocalypse refers mainly to the scapegoat mechanism as it applies to and is revealed in the Gospel texts, we see the immediacy and the frenzy of the apocalyptic and the ubiquitous violent mimetic appropriations also performed in John's Revelation.2 John captures... (shrink)

Reumen. Se describen las bases del muestreo conglomerado y muestreo sistemático. Se presentan lasecuaciones pertinentes y aquellas para la estimación del tamaño óptimo de muestreo para cada tipo demuestreo. Se demuestra la aplicación práctica de éstos clases de muestreo por medio de ejemplosreales.Palabras claves. Muestreo conglomerado, muestreo sistemático, tamaño óptimo de la muestra.. Cluster sampling and systematic sampling are described and their equations are provided.Real examples are given in order to show the applications of these types of samplings. Equations toestimate (...) optimal sample sizes are also noted.Keywords. Cluster sampling, optimal sample size, systematic sampling. (shrink)