The contribution deals with the issue of reliability theory and its principles used in the field of reliability engineering. The contribution focuses attention on the mutual linkage among risk engineering, quality engineering and reliability engineering, defines the term of reliability and clarifies reliability theory in general. The article gives an overview of the most frequently used indicators widely used in reliability theory such as probability density of failure occurring, mean and (high) failure rate, mean time between failures, mean time to failure, average life etc. and briefly defines selected reliability systems used in reliability analyses.
This contribution clarifies basic principles of profit margin in supply chain theory, defines the term supply chain, deals with the issue of double margin and determines quantitative characteristics of serial, parallel and mixed supply chain model of multiply margin.
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