http://nova.newcastle.edu.au/vital/access/services/Feed ${session.getAttribute("locale")} 5 http://nova.newcastle.edu.au/vital/access/manager/Repository/uon:6146 Sound-scapes similar to landscapes, are geometric representations of an objects’ relative positions in the real world. In this paper we demonstrate how to obtain and use a sound-scape to assist the Aldebaran NAO with localisation. We apply dimensionality reduction techniques such as statistical learning methods which include neural networks, support vector machines, the recent graph based approximation technique isometric feature mapping to extract the NAO’s field co-ordinate from its recorded acoustic data. Results obtained includes visualisations of sound-scapes (robot’s positions on field) and positional accuracies of up to 80%. 2012-05-22T04:36:37.874Z ]]> http://nova.newcastle.edu.au/vital/access/manager/Repository/uon:6147 This paper presents a system for automating the time consuming task of manual colour calibration for a mobile robot. By converting a series of YUV images to HSI format and analysing histogram data it can be seen that there are distinct regions of colour space for each object colour class and that one dimension, hue, can be used to uniquely identify each colour class. Using an expectation maximisation (EM) algorithm to estimate the parameters of a Gaussian mixture model, it is proposed that the HSI colour space can be segmented and automatically labeled for the purpose of automatic colour calibration. This method is applied to a Aldebaran Nao robot vision system that uses a ‘soft’ colour classification method to classify non-unique colour space. By reducing the colour labeling dimension to one and implementing soft classification principles, a reliable automatic calibration system was achieved. 2012-03-07T23:14:02.543Z ]]> http://nova.newcastle.edu.au/vital/access/manager/Repository/uon:5282 While strong relationships have previously been established between the El Niño/Southern Oscillation (ENSO) and climate variability in many parts of the world, previous analyses of ENSO impacts on European rainfalls have been variable and inconclusive. In this paper, the role and apparent interactions of a range of known teleconnections are assessed. It is shown that ENSO events do indeed appear to impact European rainfalls and that these impacts are likely to also depend on the concurrent state of the North Atlantic Oscillation (NAO) and the Pacific Decadal Oscillation (PDO). In particular, it is demonstrated that ENSO impacts most significantly on European wintertime rainfalls during positive (warm) phases of the PDO. 2010-04-27T04:33:48.897Z ]]>