الفهرس 
1 IntroductionOnly 14 pages are availabe for public view
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Abstract
Poor design and incorrect manufacturing techniques are obvious reasons of the low reliability. Some manufacturers hesitate to invest more money on an improved design and modern techniques of modern techniques of manufacturing and testing. Improper selection of materials is another cause for poor design. Components equipment do not operate in the same manner in all conditions.
A complete knowledge of their characteristics, applications, limitations will avoid their misuse and minimize the occurrence of failures.
Accordingly, the main purpose of this thesis is to maximize the reliability of the system, so we study some different redundant systems.
The system considered may be consisted of similar or dissimilar redundant units. There are effects on the system such as weather conditions and repairman may be present at the job site or absent. We find the mean time of system failure, availability, busy period, and cost benefit. Different reliability measures are derived and illustrated by numerical examples.