표준편차지수관리도에 대한 실증적 연구

Abstract

Control chart has been used in medical laboratory science since 1950 for total quality management. Its most prominent pioneer was the late Dr. Walter A. Shewhart, whose control chart approach remains the most widely used, other forms of control charts have also come into use in recent year for laboratory quality managemen t. Controlling the quality of materials, batches , parts, and assemblies during the course of their actual test is probably recognized quality control activity. The statistical tool most generally recommended for this work is the control chart, or some modification of it. Hitach 7150 system adopted with X bar-R control chart and twin plot chart is to manage within day variation and control sample variation for continue of total quality for Westgard mult-rules but not between day variation. So we developed standard deviation index control chart for analyzing test results among within day variation, between sample variation and between day variation for adopting 1.2s, 1.3s, 2.2 , R.4s, 4.1s, 10X bar rules for systematic variation and random variation. We found out that systematic shift is using in X bar-R control chart and twin plot chart is 63.9 percentages of total items on cumulative chart. We realized to reduce total variation in all items because we take an actions in order to reject or accept the test results on standard deviation index control chart that is to control it in one visual field. It is veη easy to investigate total error that is combined randon eπor and systematic eπor than X -bar control chart and twin plot chart among between day variation.