[IEEE Annual Reliability and Maintainability Symposium. 1998 Proceedings. International Symposium on Product Quality and Integrity - Anaheim, CA, USA (19-22 Jan. 1998)] Annual Reliability and Maintainability Symposium. 1998 Proceedings. International Symposium on Product Quality and Integrity - Optimal (s,S) policies for manufacturing systems of unreliable machines in tandem