Pasi Koikkalainen

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Benzodiazepine- and alcohol-induced ataxias in rodents have been proposed to be affected by the gamma-aminobutyric acid type A (GABAA) receptor alpha 6 subunit, which contributes to receptors specifically expressed in cerebellar granule cells. We have studied an alpha 6 -/- mouse line for motor performance and drug sensitivity. These mice, as a result of a(More)
In this paper we propose how a tree-structured self-organizing map (TS-SOM) can be used to impute incomplete data sets. The methodology has two parts, a new training algorithm utilizing incomplete data, and an imputation strategy that explains how the actual imputation is done. An introduction about evaluation studies of the proposed methodology is given(More)
Technological development and various information services becoming common has had the effect that data from everyday situations is available. Utilizing this technology and the data it produces in an efficient manner is called context-aware or ubiquitous computing. The research includes the specifications of each application, the requirements of the(More)
It is pointed out that from a point of view of parallel processing, neural network models belong to the more general class of communicating sequential processes. Sequential operating neurons communicate through input and output connections with other neurons working in parallel. While such a viewpoint brings nothing novel to the theory of neural models as(More)
Training a visual inspection device is not straightforward but suffers from the high variation in material to be inspected. This variation causes major difficulties for a human, and this is directly reflected in classifier training. Many inspection devices utilize rule-based classifiers the building and training of which rely mainly on human expertise.(More)