نتایج جستجو برای: r control charts

تعداد نتایج: 1742947  

Journal: :Information systems, mechanics and control 2017

Journal: :Quality Engineering 2023

In statistical process monitoring, the CUSUM and EWMA control charts have received considerable attention because of their remarkable ability to detect small sustained shifts. practice, variation shifts are anticipated beforehand in many processes, so focus should be on detecting a moderate large shift. The aforementioned identify minor changes population parameters as out-of-control scenarios;...

ژورنال: اندیشه آماری 2015
Amiri, Faegheh, ‎K‎h‎eradmand‎‏‎nia, ‎Manouchehr‎,

In many quality control applications, the necessary distributional assumptions to correctly apply the traditional parametric control charts are either not met or there is simply not enough information or evidence to verify the assumptions. It is well known that performance of many parametric control charts can be seriously degraded in situations like this. Thus, control charts that do not requi...

2016
Koichiro Manabe Akitaka Tsujikawa Rie Osaka Yuki Nakano Tomoyoshi Fujita Chieko Shiragami Kazuyuki Hirooka Akihito Uji Yuki Muraoka

PURPOSE To apply M-CHARTS for quantitative measurements of metamorphopsia in eyes with acute branch retinal vein occlusion (BRVO) and to elucidate the pathomorphology that causes metamorphopsia. METHODS This prospective study consisted of 42 consecutive patients (42 eyes) with acute BRVO. Both at baseline and one month after treatment with ranibizumab, metamorphopsia was measured with M-CHART...

This paper addresses the design of control charts for both variable ( x chart) andattribute (u and c charts) quality characteristics, when there is uncertainty about the processparameters or sample data. Derived control charts are more flexible than the strict crisp case, dueto the ability of encompassing the effects of vagueness in form of the degree of expert’spresumption. We extend the use o...

Journal: :مهندسی صنایع 0
عبدالستار صفایی استادیار گروه مهندسی صنایع دانشگاه صنعتی بابل رضا برادران کاظم زاده دانشیار گروه مهندسی صنایع دانشگاه تربیت مدرس محمد اقدسی دانشیار گروه مهندسی صنایع دانشگاه تربیت مدرس

one of the most important problems of the designs proposed by traditional economic-statistical approaches of control charts is inefficiency in the face of uncertainty. uncertainty in the parameters of economic-statistical models may lead to failure in rapidly detecting changes in processes and impose greater costs to the organization. monitoring the machining process in an automotive industry e...

Journal: :مدیریت صنعتی 0
نظام الدین فقیه دانشگاه شیراز امیرعباس معصومی

controlling a system with minimum information and regardless of dynamic equations which dominate systems is the aim of intelligent control. one of the common approaches for process control is applying shewhart's quality control charts. neuro-fuzzy networks, as one of the branches of artificial intelligence (ai), can play an effective role in the enforcement of process control's common...

ژورنال: اندیشه آماری 2013
arbabi, marzieh, Bameni Moghadam, Mohammad ,

T2 control charts are used to monitor a process when more than one quality variable associated with process is being observed. Recent studies have shown that using variable sample size (VSS) schemes result in charts with more statistical power when detecting small to moderate shifts in the process mean vector. This paper presents an economic- statistical design of T2 control charts with variabl...

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