نتایج جستجو برای: Assignable cause

تعداد نتایج: 396523  

Rukmini V. Kasarapu Vijayababu Vommi

Process shift is an important input parameter in the economic design of control charts. Earlier x control chart designs considered constant shifts to occur in the mean of the process for a given assignable cause. This assumption has been criticized by many researchers since it may not be realistic to produce a constant shift whenever an assignable cause occurs. To overcome this difficulty...

Journal: :European Journal of Operational Research 2007
W. L. Pearn Ya-Chen Hsu

Tool wear is a frequent and natural part in many machining processes and is a systematic assignable cause. The fraction of defectives would rise as the tool deteriorates. When the fraction defective reaches a certain level, the tool must be replaced. To minimize the defective parts and the overall tool costs, the optimal tool replacement time needs to be determined. Process capability indices (...

2002
Darja NOSKIEVIČOVÁ

This paper deals with the proposal of structure of an expert system for SPC which enables to user to select right control chart identify more quickly root cause of assignable variation and to accept suitable effective action in time.

Journal: :journal of optimization in industrial engineering 2010
rassoul noorossana majeed heydari

when a change occurs in a process, one expects to receive a signal from a control chart as quickly as possible. upon the receipt of signal from the control chart a search for identifying the source of disturbance begins. however, searching for assignable cause around the signal time, due to the fact that the disturbance may have manifested itself into the rocess sometimes back, may not always l...

Journal: :journal of optimization in industrial engineering 0
rassoul noorossana department of industrial engineeing, iran university of science and technology, narmak, tehran, 16846-13114, iran majeed heydari department of industrial engineeing, iran university of science and technology, narmak, tehran, 16846-13114, iran

when a change occurs in a process, one expects to receive a signal from a control chart as quickly as possible. upon the receipt of signal from the control chart a search for identifying the source of disturbance begins. however, searching for assignable cause around the signal time, due to the fact that the disturbance may have manifested itself into the rocess sometimes back, may not always l...

2007
Michael Heitzman

Forensic studies of pavement failures require a clear understanding of the distress observed, a logical approach to examining potential assignable causes, a reasonable connection between the distress and assignable causes, and recommendations to minimize the potential for future failures. The recommendations must be careful to address the cause and to not unduly restrict technology that has a p...

2013
K. Atashgar

When an assignable cause(s) manifests itself to a multivariate process and the process shifts to an out-of-control condition, a root-cause analysis should be initiated by quality engineers to identify and eliminate the assignable cause(s) affected the process. A root-cause analysis in a multivariate process is more complex compared to a univariate process. In the case of a process involved seve...

Journal: :Journal of Object Technology 2005
David R. Cok

class AbstractList { //@ model public int size; //@ in isEmpty; //@ model public boolean isEmpty; //@ public represents isEmpty <(size == 0); //@ public invariant size >= 0; //@ assignable isEmpty; //@ ensures isEmpty; abstract public void clear(); //@ assignable size; // but isEmpty is not assignable //@ ensures size <= \old(size); //@ ensures \old(size) > 0 ==> size > 0; abstract public void ...

2010
Fong-Jung Yu Ching-Shih Tsou Kai-I Huang Zhang Wu

Duncan first proposed the economic design of x control charts in 1956 to control normal process means and ensure that an economic design control chart actually lowers the cost, compared with a Shewhart control chart. Many authors have studied the control charts from economic viewpoint from then on. An economic design does not consider the statistical properties, such as type I or type II error ...

Majeed Heydari Rassoul Noorossana,

When a change occurs in a process, one expects to receive a signal from a control chart as quickly as possible. Upon the receipt of signal from the control chart a search for identifying the source of disturbance begins. However, searching for assignable cause around the signal time, due to the fact that the disturbance may have manifested itself into the rocess sometimes back, may not always l...

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