EEG activities with open eyes in a quiet state (OA), during the pseudo-Raven's test (PRA), in hypnagogic state (HYP) and in the course of REM sleep (REM) are characteristic by nearly flat curves. We observed the states with eyes closed (OC), with hyperventilation (HV), during mental activity of calculation (CAL) and in NONREM 1 sleep (NR 1). 24 tested persons (probands) were investigated. We have found 8 typical states of EEG signals, which all have relation to attention and mental activity. Consequently, the EEG analysis can help in the differentiation between the above eight states. Using similar analyses, it is possible to discriminate all stages of NONREM and REM sleep without polysomnography.
Decrease of attention and an possible micro-sleep of an artificial system operator is very dangerous and its early detection can prevent great losses. This article deals with a classification of States of vigilance based on the analysis of an electroencefalographic activity of the brain. Preprocessing of data is done by the Discrete Fourier Transform. For the recognition radial basis functions (RBF), a k-nearest neighbor and a method based on the Bayesian theory is used. Its coefficients are found using the maximum likelihood estimation. An experiment with recognition of 6 States of vigilance created according to reaction time is performed.
The study illuminates the reign of King of the Romans and Hungary Sigismund of Luxembourg in the North of Veneto (Belluno, Feltre, Serravalle). This region was in Sigismund’s power only for a short time in 1411/12-1420 in connection with his military conflict with the Republic of Venice. Based on for the most part unpublished sources from the archives of the city of Bel- luno, attention is devoted to the people with whom the king entrusted administration of the area (imperial vicars and captains/castellans). It shows that the majority of these people and the garrisons assigned to them, the number of which reaches several dozen or even hundreds, apparently came from the Czech lands mainly in the period 1415-1420. Following step-by-step various aspects of the activity of the royal representatives and their garrisons, frequent conflicts with the local self-government and population stand out. and Ondřej Schmidt.