Thorsteinn Rögnvaldsson

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The Langevin updating rule, in which noise is added to the weights during learning, is presented and shown to improve learning on problems with initially ill-conditioned Hessians. This is particularly important for multilayer perceptrons with many hidden layers, that often have ill-conditioned Hessians. In addition, Manhattan updating is shown to have a(More)
The discrimination powers of Multilayer perceptron (MLP) and Learning Vector Quantisation (LVQ) networks are compared for overlapping Gaussian distributions. It is shown, both analytically and with Monte Carlo studies, that the MLP network handles high dimensional problems in a more eecient way than LVQ. This is mainly due to the sigmoidal form of the MLP(More)
An automated peak picking strategy is presented where several peak sets with different signal-to-noise levels are combined to form a more reliable statement on the protein identity. The strategy is compared against both manual peak picking and industry standard automated peak picking on a set of mass spectra obtained after tryptic in gel digestion of 2D-gel(More)
Embedded network software has become increasingly interesting for both research and business as more and more networked embedded systems emerge. Well-known infrastructure protocol stacks are reimplemented on new emerging embedded hardware and software architectures. Also, newly designed or revised protocols are implemented in response to new application(More)
This paper presents an overview of an autonomous robotic material handling system. The goal of the system is to extend the functionalities of traditional AGVs to operate in highly dynamic environments. Traditionally, the reliable functioning of AGVs relies on the availability of adequate infrastructure to support navigation. In the target environments of(More)
  • bullet K Nilsson, J Bigun, +37 authors Scriptable
  • 2005
4.1 Vetenskapliga tidskrifter (Journals) med " full paper review " • M. Kruusmaa & J. Willemson, " Covering the path space: a casebase analysis for mobile robot path planning " , Knowledge-Based Systems 16, pp. 235-242 (2003) • M. Kruusmaa, " Global navigation in dynamic environments using case-based reasoning " , Localization of corresponding points in(More)
EKA Chemicals produces chemicals for pulp bleaching processes and paper making. The problem studied in the DALLAS project is the industrial production of hydrogen peroxide at EKA Chemicals' plant in Bohus, Sweden. Figure 4.1 shows a simple sketch of the hydrogen peroxide production process. A " working solution " , a mixture of a complex organic chemical(More)
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