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1. (The evolution of) post-secondary education: a computational model and experiments

Creator:: Ortmann, Andreas, Slobodyan, Sergey, Univerzita Karlova. Centrum pro ekonomický výzkum a doktorské studium, and Národohospodářský ústav (Akademie věd ČR)
Publisher:: CERGE-EI
Format:: electronic and 46 s.
Type:: model:monograph and TEXT
Subject:: Ekonomie, vysoké školy, vyšší odborné školy, pomaturitní studium, ekonomické chování, matematické modelování, 378, 377.6, 330.16, 004.94, (048.8), 4, and 33
Language:: English
Description:: Andreas Ortmann, Sergey Slobodyan. and born digital
Rights:: http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

6. Analysis of the electrical heart field

Creator:: Otomar Kittnar and Mikuláš Mlček
Format:: print
Type:: article, články, model:article, and TEXT
Subject:: Fyziologie člověka a srovnávací fyziologie, elektrokardiografie, matematické modelování, electrocardiography, mathematical modeling, 14, and 612
Language:: English
Description:: There are three basic procedures used for an assessment of the electrical heart field from the body surface: standard electrocardiography, vectorcardiography, and body surface potential mapping (BSPM). BSPM has two major advantages over both other methods: 1) it allows exploring the entire chest surface, thus providing all the information on the cardiac electric field available at the body surface; 2) it is more sensitive in detecting local electrical events, such as local conduction disturbances or regional heterogeneities of ventricular recovery. Nevertheless the results obtained using BSPM procedure cannot answer all questions about real causality of detected changes of the electrical heart field. We tried therefore to use mathematical model of the electrical field in order to answer these questions. A simple and anatomical forward calculation model was used to test the hypothesis whether the altered position of the heart could explain heterogeneity of repolarization at late stages of pregnancy in humans. The hypothesis was declined. Further findings included: A. Repolarization duration (represented by QT interval) in healthy subjects are distributed regularly and predictably on the body surface carrying no information about local pathology. B. At any systemic analysis of ventricular repolarization, it is vital to consider the regions where any electrode systems record low amplitudes due to methodological, not pathological reasons. C. Anatomical (heterogeneous) model did not yield superior results over simple (homogenous) ones possibly since none reflected the specific torso geometry of individual patients., O. Kittnar, M. Mlček., and Obsahuje bibliografii a bibliografické odkazy
Rights:: http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public