Özçomak, Mehmet Suphi
September 2003
Ekev Academic Review;Fall2003, Vol. 7 Issue 17, p337
Academic Journal
Using multivariate quality control methods rather than univariate quality control methods leads to lose of information in a process which has two or more quality variables correlated with each other. Hotelling T² control chart accepted as a basis of multivariate quality control methods is commonly used to compensate this lose of information. In this study, Hotelling T² control chart and Hotelling T² control chart for individual observations is explained. Also, when this chart gives an out-of-control signal, it is explained how to determine and interpret this signal. In the application part of the study, it has been conducted a multivariate quality control study in a paint factory in Erzurum. There are three major quality variables for the paint: Viscosity, solid particles and specific weight. By using these variables, a quality control study is carried out with Hotelling T² control chart. Major findings show that the process gives an out-of-control signal for the 27th sample, which is thought it results from solid particles.


Related Articles

  • Working With Fixed Value Measurement Standards. Payne, Graeme C. // Quality Progress;Nov2006, Vol. 39 Issue 11, p77 

    The article focuses on how to work with fixed value measurement standards. The measurement standard may be adjusted to make the unit under test indicate the nominal value and the required input can be read from the standard. The measurement standard may be fixed but it often changes over time...

  • Six Sigma Stigma? Kihn, Martin // Fast Company;Sep2005, Issue 98, p40 

    This article clarifies the concept of Six Sigma. Sigma is the Greek symbol used to denote deviations from the mean. And so Six Sigma is essentially a set of procedures and tools designed to measure and analyze defects in a process and help determine what is causing them. The goal--the six sigma...

  • One Size Does Not Fit All. Foster Jr., S. Thomas // Quality Progress;Jul2006, Vol. 39 Issue 7, p54 

    The article points out that the two emerging concepts of organizational context and contingency theory will have an impact on the field of quality management in the next several years. These two concepts are essential to understanding how to apply quality processes because one-size-fits-all...

  • Make every mark count.  // T & P: Tooling & Production;Apr2005, Vol. 71 Issue 4, p42 

    Discusses the Direct Part Mark Identification (DPMI), a way to improve quality control of the manufacturing production process by marking each part with a machine-readable code that can be tracked through the production cycle from beginning to end. Benefits of DPMI; Considerations before...

  • Scaling Artwork BASICS. Paur, Tom R. // Printed Circuit Design & Manufacture;Feb2004, Vol. 21 Issue 2, p51 

    Discusses the management of errors in the registration of printed circuit boards. Categories of registration error; Fabrication processes wherein shift error may occur; Potential cause of panel-to-panel errors.

  • MTF quickly characterizes the performance of imaging systems. Sadoulet, Samuel P. // Laser Focus World;Mar2006, Vol. 42 Issue 3, p49 

    The article reports on the use of certifiable modulation-transfer-function (MTF) inline testing to strike a reasonable balance between accuracy, throughput, and cost, making it practical for large-volume production quality-control environments in the U.S. The MTF of a system is found by...

  • Analysis Methods of QC Group Activity. Fanjun Meng; Lihong Liu; Yunhe Zhang; Fei He; Yi He; Jun Gao; Ying Yu; Huijun Chao // Advanced Materials Research;2014, Issue 909, p265 

    This article analysis QC group activity common method, including permutation diagram, causality diagram, countermeasure table, and discussion methods---brainstorming method. It grasp the design process and the actual value, point out the direction and laid a solid foundation for work of QC group...

  • YarnMaster Zenit: New dimension to quality control.  // Indian Textile Journal;Jan2005, Vol. 115 Issue 4, p85 

    Evaluates the YarnMaster Zenit online quality control system by LOEPFE, which incorporates the extensive experience gained from the YarnMaster Spectra. Key features; Details of how to operate the YarnMaster Zenit clearer system; Description of the system' sensing head.

  • Beyond PDCA—A New Process Management Model. Gupta, Praveen // Quality Progress;Jul2006, Vol. 39 Issue 7, p45 

    The article discusses the evolution of the plan-do-check-act (PDCA) cycle as a part of quality management to the plan-do-study-act (PDSA) cycle for continuous improvement. The author suggests a new process management model that incorporates the work of previous quality thought leaders. This...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics