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The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.Tue, 09 Feb 2016 18:13:25 GMT2016-02-09T18:13:25ZPrávní jistota – možný problém daňové politiky vyspělých zemí?
http://hdl.handle.net/10084/111262
Právní jistota – možný problém daňové politiky vyspělých zemí?
Machová, Zuzana; Kotlán, Igor
Thu, 01 Jan 2015 00:00:00 GMThttp://hdl.handle.net/10084/1112622015-01-01T00:00:00ZCalculation of the key length for quantum key distribution
http://hdl.handle.net/10084/111261
Calculation of the key length for quantum key distribution
Mehic, Miralem; Niemiec, Marcin; Vozňák, Miroslav
Quantum key distribution (QKD) is based on the laws of quantum physics and therefore it can guarantee the highest level of security. It is used to establish the key that is used for further symmetrical encryption. Since QKD consists of several phases in which the key is reduced, it is necessary to define the equation by which the length of the raw key is calculated. In this paper, we analyse all QKD phases with an emphasis on the explanation of the process of shortening the initial key. The results are verified with a large number of tests using a quantum cryptography simulator.
Thu, 01 Jan 2015 00:00:00 GMThttp://hdl.handle.net/10084/1112612015-01-01T00:00:00ZDistributed measurement system with GPS synchronisation and its use in electric traction
http://hdl.handle.net/10084/111260
Distributed measurement system with GPS synchronisation and its use in electric traction
Hrbáč, Roman; Kolář, Václav; Mlčák, Tomáš
This paper deals with distributed measurements in
power electrical engineering. The word “distributed” means
that the measurement is carried out simultaneously in different
locations. Distance between these locations can be tens of
kilometers or more. For a long time, the authors have been
performing electrical measurements in electric traction,
especially in electrified railways. Due to the extensiveness of the
railway network, it is very important to find the solution of this
problem. After a thorough examination of the subject, the
authors have developed computer based measuring apparatuses
and GPS based synchronizers. This paper describes the
creation of the GPS synchronizer as well as a post-processing
data synchronization method. The concluding part includes an
example of this apparatus being practically used while carrying
out measurements in a railway traction transformer substation
and on track circuits. Some interesting measurement results, as well as their analysis, are also presented here.
Thu, 01 Jan 2015 00:00:00 GMThttp://hdl.handle.net/10084/1112602015-01-01T00:00:00ZOn a formula for the h-index
http://hdl.handle.net/10084/111259
On a formula for the h-index
Bertoli-Barsotti, Lucio; Lando, Tommaso
The h-index is a celebrated indicator widely used to assess the quality of researchers and organizations. Empirical studies support the fact that the h-index is well correlated with other simple bibliometric indicators, such as the total number of publications N and the total number of citations C . In this paper we introduce a new formula View the MathML source, as a representative predictive formula that relates functionally h to these aggregate indicators, N, C and the highest citation count cMAX. The formula is based on the ‘specific’ assumption of geometrically distributed citations, but provides a good estimate of the h -index for the general case. To empirically evaluate the adequacy of the fit of the proposed formula View the MathML source, an empirical study with 131 datasets (13,347 papers; 288,972 citations) was carried out. The overall fit (defined as the capacity of View the MathML source to reproduce the true value of h, for each single scientist) was remarkably accurate. The predicted value was within one of the actual value h for more than 60% of the datasets. We found, in approximately three cases out of four, an absolute error less than or equal to 2, and an average absolute error of only 1.9, for the whole sample of datasets.
Thu, 01 Jan 2015 00:00:00 GMThttp://hdl.handle.net/10084/1112592015-01-01T00:00:00Z