Quantal penetration through a (stationary) one-dimensional potential barrier is considered as a time evolution of an initially prepared wave packet. The large-time asymptotics of the process is concerned. Locality of the potential imposes certain analytical properties of the interaction amplitudes in the energy representation. The results are presented in terms of development of the phase-space (Wigner's) quasi-distribution. The phase-space evolution kernel is constructed, and it is shown that in the presence of a positive potential no part of the distribution is (...) transported faster than the free particle. For the case of a small initial momentum uncertainty, the deformation of the coordinate density is considered, including a possible advance of its maximum, which would not mean any noncausal signal transport. (shrink)

Supporters of eliminative connectionism have argued for a pattern association-based explanation of language learning and language processing. They deny that explicit rules and symbolic representations play any role in language processing and cognition in general. Their argument is based to a large extent on two artificial neural network (ANN) models that are claimed to be able to learn the past tenses of English verbs (Rumelhart & McClelland, 1986, Parallel distributed processing, Vol. 2, Cambridge, MA: MIT Press; MacWhinney & Leinbach, 1991, (...) Cognition, 40, 121-157). In this article we critically review Rumelhart and McClelland's as well as MacWhinney and Leinbach's ANN models and conclude that they do not succeed in the assigned task of learning the past tenses of English verbs. In order to answer their challenge to the symbolic processing approach, we present our symbolic pattern associator (SPA)-a general-purpose pattern associator that can learn to associate arbitrary discrete patterns. We carried out several experiments with the SPA using the same set of verbs that was used in MacWhinney and Leinbach's simulation with more realistic training and testing procedures. The SPA outperformed the connectionist models by a wide margin in the accuracy of learning, and successful inductive generalizations to unseen verbs. Our SPA has very natural and psychologically realistic explanations to many psychological effects such as U-shaped learning curve, and is much closer to human subjects in predicting past tense of the pseudo-verbs. In contrast to ANNs, whose internal representations are entirely opaque, the SPA can represent the acquired knowledge in the form of production rules that allow for further higher-level processing and integration, resulting in linguistically realistic associative templates for irregular verbs and production rules for regular verbs. In the light of these findings, we conclude that eliminative connectionists' vision of cognition as simple pattern association and pattern recognition without symbolic representation is inadequate. Pattern association as such does not imply rule-less or cue-based models of language acquisition or of human learning in general. (shrink)

This paper reports the introduction of electronic handsets, like those used on the television show 'Who Wants To Be A Millionaire?' into the teaching of philosophical logic. Logic lectures can provide quite a formidable challenge for many students, occasionally to the point of making them ill. Our rationale for introducing handsets was threefold: to get the students thinking and talking about the subject in a public environment; to make them feel secure enough to answer questions in the lectures because the (...) system enabled them to do this anonymously; and to build their confidence about their learning by their being able to see how they were progressing in relation to the rest of the students in the class. We have achieved all of these and more. Our experience has revealed that the use of handsets encourages a more dynamic form of student interaction in an environment - the lecture - that can, in the wrong hands, be utterly enervating, but they also provide an opportunity for the lecturer to respond to students' difficulties at the time when they really matter. In this paper, we discuss our case of rapid adoption, our grounds for judging it a success, and what that success seems to have depended on. (shrink)

Peirce’s doctrine of God has scarcely been studied at all. This is surprising because his own naturally religious temperament, his desire for philosophical completeness and the influence of Kant, all led him to give an important place to theistic speculation in his philosophy. It is true that few parts of his philosophy reveal more than the fragmentary and unfinished nature of his thinking. This however does not take away from its importance both for the interpretation of his philosophy and for (...) the evaluation of its contribution. In this paper I want to examine his doctrine of God mainly in order to discover and outline what views he held in the matter. Such examination is an essential preliminary to any consideration of the value of his theistic thinking. Moreover, an objective exposition is already the best beginning of evaluation. However it is impossible to undertake this kind of examination without a careful search into various corners of his writings and a meticulous and slightly laboured presentation of one’s findings. But I think that the patience involved in such research has a rich reward. (shrink)

By using a tomographic approach to quantum states, we rise the problem of nonlocality within a single particle (single degree of freedom). We propose a possible way to look for such e®ects on a qubit. Although a conclusive answer is far from being reached, we provide some re°ections on the foundational ground.

The complexity of biobank research raises concerns about individuals’ understanding of the information conveyed in the consent process for such research.. We report the results of a qualitative, cognitive interview study with an ethnically, linguistically, and educationally diverse sample of 43 respondents to assess the clarity and utility of a multimedia tool developed for a biobank. Using weighted randomization, respondents were assigned to either view the multimedia tool or read a written consent document . The study illustrates the utility of (...) cognitive interviews for gaining insights from prospective research participants about the clarity of informed consent tools. Findings suggest that a multimedia tool is useful for communicating key messages but should be combined with a written consent document and personal interaction with the study staff. We recommend that the potential value of multimedia tools should be more rigorously tested in a randomized controlled trial. (shrink)

ch.1. Dialekh'ka esteticheskikh i︠a︡vleniĭ.--ch.2. Dialektika iskusstva.--ch.3. Dialektika Khudozhestvennogo razvitii︠a︡.

It is proposed to expand the structure of the intelligent information system with an addition of knowledge-oriented decision support subsystem. The description of an intellectual workplace is given. Based on this, the main procedures of the subsystem are proposed: the creation of a knowledge base and the search for appropriate responses to a given action. The structure and stages of creating a knowledge base based on the analysis of rules set in natural language are described. The advantages of this approach (...) in comparison with the common approaches based on neural networks are substantiated. (shrink)