On stationary characteristics of systems with element-wise supplement reserve of time

A system is considered that, contains elements which possess time reserve under a restoration. An analytic method of defining stationary characteristics of reliability is given by using compositions of semi-Markov processes with a finite set of states. An application of the results obtained is illustrated on an example of two model problems.Translated from Dinamicheskie Sistemy, No. 7, pp. 152–155, 1988.