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Synaptic normalization is used to enforce competitive dynamics in many models of developmental synaptic plasticity. In linear and semilinear Hebbian models, multiplicative synaptic normalization fails to segregate afferents whose activity patterns are positively correlated. To achieve this, the biologically problematic device of subtractive synaptic normalization must be used instead. Our own model of competition for neurotrophic support, which can segregate positively correlated afferents, was developed in part in an attempt to overcome these problems by removing the need for synaptic normalization altogether. However, we now show that the dynamics of our model decompose into two decoupled subspaces, with competitive dynamics being implemented in one of them through a nonlinear Hebb rule and multiplicative synaptic normalization. This...
This paper describes how computer-human interaction in ambient computing environments can be best informed by conceptualizing of such environments as problem solving systems. Typically, such systems comprise multiple human and technological agents that meet the demands imposed by problem constraints through dynamic collaboration. A key assertion is that the design of ambient computing environments towards efficacious human-machine collaboration can benefit from an understanding of competence models of human-human and animal-animal collaboration. Consequently, design principles for such environments are derived from a review of competent collaboration in human groups, such as sport teams, and animal groups, such as wolf packs.
This is a critique of Jean-Claude Guedon's "The 'Green' and 'Gold' Roads to Open Access: The Case for Mixing and Matching"(Serials Review 30(4) 2004). J-CG thinks that what needs to be self-archived is unpublished papers (preprints), and that peer review then somehow needs to be added, in order to make the preprints into validated publications. But what needs to be self-archived is peer-reviewed, published postprints. Those have already been validated. JC-G is mixing up Gold OA (OA journal publishing) and Green OA (OA self-archiving of non-OA journal articles).
As a fundamental research program, the International Technology Alliance (ITA) aims to explore innovative solutions to some of the challenges confronting US/UK coalition military forces in an era of network-enabled operations. In order to demonstrate some of the scientific and technical achievements of the ITA research program, we have developed a detailed military scenario that features the involvement of US and UK coalition forces in a large-scale humanitarian-assistance/disaster relief (HA/DR) effort. The scenario is based in a fictitious country called Holistan, and it draws on a number of previous scenario specification efforts that have been undertaken as part of the ITA. In this paper we provide a detailed description of the scenario and review the opportunities for technology demonstration in respect of a number of ITA research...
Neurofuzzy systems are ideal for modelling nonlinear processes; combining the transparent knowledge representation of fuzzy systems with the well established learning techniques of associative memory networks. In the control community there is a need for high-dimensional modelling, but unfortunately these neurofuzzy systems suffer from the curse of dimensionality. To make the use of high-dimensional neurofuzzy systems practical, off-line construction algorithms need to be developed which generate parsimonious models. This need for off-line construction algorithms is enhanced by the lack of expert knowledge from which models are traditionally developed. This paper outlines the concepts of B-spline neurofuzzy systems and presents several representations which can be exploited to produce parsimonious models. Finally, an off-line construct...
Métricas: As medidas do uso e do impacto quantificarão, avaliarão, navegarão, propagarão e recompensarão os frutos do acesso livre pela via verde Mandatos: As exigências para auto-arquivar, adotadas por todas as universidades e agências de fomento à pesquisa , gerarão o acesso livre, pela via verde a 100% da produção científica.
This paper is concerned with broken hypertext links. These are links which do not refer the reader to the information that was intended by the author of the link. The paper presents three distinct models which have been adopted by various developers for the storage of hypertext links, and considers the problems that may result from adopting each of these models, and reviews and classifies a number of methods that may be adopted for preventing these problems. The link models that are reviewed range from the tightly coupled links implemented by html in the World Wide Web, through to the loosely coupled links adopted by some link server systems. The paper concludes that there can be no universal solution to this problem; rather there is a range of approaches from which hypertext developers must choose a solution appropriate to their needs.
The potential presence of fractional delays, non-minimum phase parts, and a colouring of the channel output can require very large adaptive equalizers exhibiting slow convergence for LMS-type algorithms. In this paper, we address the equalization problem via a subband approach, which can significantly reduce computational complexity and improve convergence speed. Of particular interest in this paper is the tracking behaviour, which determines the speed with which the algorithm is capable of following time variations in the channel. We give reasons why tracking of LMS-type subband adaptive algorithms should be comparable to the fullband case. Simulation results with a time varying channel are presented.
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