Industrial Automatic Control Systems and Controllers Annotation << Back Evaluation of the Effi ciency of theACS Functioning in the Conditionsof Infringement of the Quality ofTopicality and Values of Information A.V. Parinov, L.P. Korotkikh, D.B. Desyatov, L.V. Stepanov, G.N. Nurutdinov The uniqueness of information processing mechanisms in automated control systems and the increased interest of intruders lead to an increase in the relevance of the problems associated with their protection. The paper considers the issues of constructing risk-models of the violation of the qualities of the relevance and value of information in automated control systems. Particular attention is paid to the connection between the qualities of relevance and the value of information received as a result of their work. Analytical expressions for the risk and damage function in the time range in automated control systems that can serve as a mathematical basis for risk assessment are obtained. An analytical expression is obtained to assess the chance of obtaining up-to-date information when operating automated control systems until the quality of the information is violated. An analytical expression for estimating the chance can be used to calculate the effectiveness of automated control systems. Keywords: survivability; automated control system; risk; damage; effi ciency; utility function. Contacts: E-mail: val_irkhin@mal.ru Pp. 13-24.