ITS Professor Develops Control Diagram for Product Quality Improvement

Control charts are useful for monitoring process stability in improving the quality of a product. This prompted one of the professors from the Faculty of Science and Data Analytics (FSAD) of the Sepuluh Nopember Institute of Technology (ITS) to develop a control chart used to monitor shifts in the variability of a product.

Through his research, Muhammad Mashuri, said that the uniformity of a company's products is one of the benchmarks for quality products. The more uniform a product, the smaller the resulting variability or the higher the quality of the resulting product.

Mashuri said that although they are able to compete in price and service, the product will not be able to survive for a long time if it is not of high quality. In addition, sales can certainly be inconsistent.

"Therefore, improving the quality of products and services is crucial for the sustainability of a company," said Mashuri in a scientific oration delivered when he was inaugurated as a professor in a written statement, Thursday, October 13, 2022.

Mashuri developed a control chart of random multivariate variability in his research. According to him, multivariate variability control charts can be grouped into three parts. Namely, the variability control chart research for observations in the form of subgroups, individual, and simultaneous.

"The target quality control method has experienced rapid development, but the control of variability has received less attention," said the 149th ITS professor.

This ITS Statistics Department lecturer explained the correlation between diagrams. He said that the Vector Standard Deviation (VSD) control chart is useful for monitoring shifts in subgroup variability. Meanwhile, the ????????D-tielda control chart is useful for monitoring individual variability shifts.

"Finally, the Tr(R2) diagram is useful in monitoring process variability for multivariate characteristics with different units and sizes," he explained.

In its development, the doctoral alumnus of the Bandung Institute of Technology (ITB) Mathematics compared the diagrams that were developed to be more sensitive in detecting the observation process outside the limits. "The results of this study are the development of various control charts that have existed previously," explained the professor who currently also serves as Vice Chancellor II of the Kalimantan Institute of Technology (ITK).

Based on the development, Mashuri revealed an effective control chart for the prevention of defective products. In addition, control charts are able to provide diagnostic and predictive information, as well as improve product quality, both goods and services.

"Quality products will increase market share, while increasing market share will certainly increase company profits," he said.

Mashuri said that when the company's profit increases, the dividend also increases and has the potential to increase employee earnings. So, it can also improve the well-being of the community.

On the other hand, quality products at competitive prices can strengthen the potential for these products to be exported. "If the increase in product quality attracts international markets, foreign exchange and trade surplus will also increase," he said.

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