Adjustment speed is one of the main operation features of adaptive antenna arrays with the steepest descent gradient algorithm in telecommunication networks of information systems. Traditionally, estimation of the transient processes involves a computer simulation of the adaptive antenna array according to the selected noise environment. Substantial time required to create a respective model, big computational load that leads to quite a long period of time for performing required mathematical operations, as well as limited possibilities of simulation results interpretations are among the main drawbacks of the traditional approach. The paper proposes an integral indicator of adjustment parameters estimation of adaptive antenna arrays optimized according to the root-mean-square criterion and that does not require performing of the time consuming computer simulation of the transient processes. Integral indicator assumes values from 1, which corresponds to the quickest adaptation process, to 0, which indicates an absence of adaptation, and is built with account of the eigenvalues distribution of the array correlation matrix, squares of direction cosines of the optimal weight vector on the eigenvalues of the antenna array correlation matrix and the trace of this matrix. Computer simulation helped to establish that the designed indicator permits to correctly predict the speed of the transient processes in adaptive antenna arrays and perform their comparative analysis for different noise environments. Additionally, computation data, which are used for obtaining this indicator, allow us to clearly explain the character of the transient processes in the adaptive antenna arrays.
The paper deals with topical issues related to the protection of critical infrastructure, which depend on the survival of the human community. It is shown that rapid progress in the field of information technology, on the one hand, allows the modern economies of many countries to become inextricably interconnected; interfering with the work of critical infrastructure. The analysis of what are the true causes of such close attention to such objects by cyber terrorists. Top 10 major threats to industrial control systems are presented. The following steps determine the criticality of the infrastructure objects. The following is a list of 11 critical sectors and 37 relevant sub-sectors identified by the European Union. The answer is given to the question with which target countries should develop national strategies for the protection of critical infrastructure objects. A strategy for quantifying the level of security of critical infrastructure against the risk of third-party cybernetic exposure is proposed. The necessity to unite different elements of protection of critical infrastructure objects by states is substantiated. It is important that cybersecurity policies should be central to the protection of critical infrastructure. It is noted that not all national cybersecurity strategies provide the same place and relevance for critical infrastructure. It is noted that when developing a national strategy for the protection of critical infrastructure, it is important to compile a comprehensive list of all relevant national policies. It is concluded that today it is an important tool for the protection of critical infrastructure
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