document: Construction of double sampling s-control charts for agile manufacturing Double sampling -LRB- DS -RRB- X-control charts are designed to allow quick detection of a small shift of process mean and provides a quick response in an agile manufacturing environment . However , the DS X-control charts assume that the process standard deviation remains unchanged throughout the entire course of the statistical process control . Therefore , a complementary DS chart that can be used to monitor the process variation caused by changes in process standard deviation should be developed . In this paper , the development of the DS s-charts for quickly detecting small shift in process standard deviation for agile manufacturing is presented . The construction of the DS s-charts is based on the same concepts in constructing the DS X-charts and is formulated as an optimization problem and solved with a genetic algorithm . The efficiency of the DS s-control chart is compared with that of the traditional s-control chart . The results show that the DS s-control charts can be a more economically preferable alternative in detecting small shifts than traditional s-control charts
doc_bio_tags: O O O O O O O B I O O O O O O O O O O O O O O O O O O O O O O O O O O O B I O O O O O O O O O O O B I I O O O O O O O O B I I O O O O O O O O O O O O O O O O O O O O B I I O O O O O O O O O O O O O O O O O O O O B I I O B I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
extractive_keyphrases: agile manufacturing process standard deviation statistical process control genetic algorithm
abstractive_keyphrases: double sampling s-control charts double sampling x-control charts process mean shift detection