Shankar (1999) introduced the concept of ‘corrective action scheme’ to maintain
the high quality of the production processes that are not well-behaved and/or
subject to some deterioration. Subsequently, Shankar and Sahu (1999)
developed a corrective action model to study the effect of marginal quality
performance of the process. A production process generally tends to lose some
of its efficiency in service because of deterioration of machines and equipment
as time elapses. In consequence, the quality of products from the process
decreases with time, and therefore, some corrective action should be taken. More
specifically, the problem under consideration may be stated as follows: “Given
a production process being subject to some deterioration, then the questions
arise when to perform which corrective action in order to maintain high quality
level of the process. Not having full information of the actual state of the process,
the decisions have to be based on some partial information obtained for instance
by sampling. Possible corrective actions are (minimal) repairs, adjustments,
renewals, which all can be performed after detection of the deterioration or as
preventive actions. A policy includes the rules for getting the information, and
deciding what to do”.
Gupta and Groll (1961) developed acceptance-sampling plans based on life
tests for the Gamma failure model. Later on, sampling inspection plans were
studied by several authors. Some references may be made to Gupta (1962),
Goode and Kao (1961), Katam and Rosaiah (1989) and Srivastava (1999). |
