Control charts are the most important tools of statistical process control used to discriminate between assignable and common causes of variation and to improve the quality of a process. To design a control chart, three parameters including sample size, sampling interval, and control limits should be determined. The objectives are hourly expected cost, in-control average run length, power of th...

Aim: The present study aims to determine the effectiveness of bates exercise on myopia.Methods and Materials: A one group pretest posttest design was used for study. total 60 samples were collected using non probability sampling technique children with myopia as samples. demographic data visual acuity snellen chart from samples, followed by that conducted chart. After a period intervention exer...

OBJECTIVE This prospective study aims to identify and compare the incidence of bacterial contamination of hospital charts and the distribution of species responsible for chart contamination in different units of a tertiary hospital. METHODS All beds in medical, surgical, pediatric, and obstetric-gynecologic general wards (556) and those in corresponding special units (125) including medical, ...

in acceptance-sampling plans, the items of an incoming lot are inspected one by one. if the number of nonconforming items in sample is equal zero, the lot is accepted but if the number of nonconforming items is equal to one, then second sample is taken and the policy of zero acceptance number would be applied for the second sample. in this paper, a mathematical model is developed to design sing...

Control chart techniques have been widely used in industries to monitor a process in quality improvement. Whenever we deal with variables data, we usually employ a combination of X-bar chart and R chart (or S chart) to monitor both the center and the spread of the process. In this paper, we propose a simple alternative, that is, we design a single chart to monitor both the center and the spread...

The paper is concerned with the thermodynamic analysis of a multi-stream heat exchanger system for Allam cycle and development regenerator flow chart. procedure are described in detail. constructed five double-flow exchangers has 2.5% lower power than ideal exchanging system. Besides, subsequent interaction principle transfer maximal amount proposed: it necessary to begin cooling heating flows ...

Control charts are extensively used in manufacturing contexts to monitor production processes. This article illustrates economical design of a variable sample size and control limit Hotelling’s T2 control chart based on a novel cost model when occurrence times of the assignable causes are exponentially distributed. The proposed nonlinear cost model is an extension of Duncan’s (J Am Stat ...