Marilena Petrou

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A two-step method for identification and elimination of the cardiac contribution in single-trial magnetoencephalographic (MEG) signals is proposed. In the first step, the mean interfering signal (MIS) in one period is estimated by QRS-synchronous averaging of the raw MEG data. In the second step, a QRS-synchronous segmentation of the MEG signals is(More)
Texture analysis of positron emission tomography (PET) images of the brain is a very difficult task, due to the poor signal to noise ratio. As a consequence, very few techniques can be implemented successfully. We use a new global analysis technique known as the Trace transform triple features. This technique can be applied directly to the raw sinograms to(More)
The distribution and morphology of neurons labelled with antisera to glutamate or aspartate were examined, at the light and electron microscope levels, in the rat visual cortex. Using widely accepted light microscopic features as well as well-established nuclear, cytoplasmic, and synaptic criteria, we noted that glutamate-immunoreactive neurons were(More)
The overarching theme of data and information fusion for military purposes is to create a superior decision edge. The research in this paper is a funded project within the general dynamics led data and information fusion defense technology centre consortium in the UK. The research is concerned with the development of a novel approach to smart decision(More)
(2010). The challenge of supporting networked personal inquiry learning across contexts. Copyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyright owners. For more information on Open Research Online's data policy on reuse of materials please consult the policies page. Abstract Supporting learning(More)
The Open University's repository of research publications and other research outputs Using netbooks to support mobile learners' investigations across activities and places Journal Article (2010). Using netbooks to support mobile learners' investigations across activities and places. Copyright and Moral Rights for the articles on this site are retained by(More)
Image resolution of the multihole collimator gamma rays camera is always an issue. In this paper, we present a comparative study of various methods proposed to increase the resolution of images captured by a gamma camera using the Wiener filtering. A simulated multihole collimator gamma camera was used, modelled by the Monte Carlo N-Particles Code version(More)
Interactions between students can be ineffective when they fail to understand how to talk together and what they should aim to achieve (Dawes, Mercer & Wegerif, 2004). Research suggests that argumentation skills need to be taught explicitly to children and recent work developed students' collaborative argumentation as a means of improving their(More)
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