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Identification of critical speeds using unbalance response data
Balda, Miroslav
A new method of the identification critical speeds out of noisy measurements of rotor responses to an unknown unbalance is described. The identification procedure is based on the fitting experimental data by a response of a Single-Imput Single-Output **em. The method yields natural frequencies with dampings of the rotor out of data measured at a certain point of a machine. The result may serve to estimating planes of modal components of an unbalance.
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New physical attacks and security of smart-card
Hrubý, Jaroslav
Power analysis is a successful cryptonalytic technique which extracts secret inforamtion from smart-card by analysing the power consumed during the execution of their internal programs. These attacks are particularly dangerous in financial applications in which users their smart-cards into teller machines which are owned and operated by potentially dishonest entities.
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