A Sokhotski-Plemelj problem related to a robot-safety device system

We introduce a robot-safety device system attended by two di erent repairmen. The twin system is characterized by the natural feature of cold standby and by an admissible “risky” state. In order to analyse the random behaviour of the entire system (robot, safety device, repair facility), we employ a stochastic process endowed with probability measures satisfying general steady-state di erential equations. The solution procedure is based on the theory of sectionally holomorphic functions. An application of the Sokhotski–Plemelj formulae determines the long-run availability of the robot-safety device. Finally, we consider the particular but important case of deterministic repair. c © 2000 Published by Elsevier Science B.V. All rights reserved.