Internal deployment of quality engineering at IHI began in 1994 and has continued up to the present. Despite the passage of some seventeen years, the current level of deployment could not be called adequate. To clarify the issues involved in taking the internal deployment of quality engineering to a higher level at IHI and see how to deal with them, a case study was carried out, using a case in which quality engineering had been applied, to determine whether the principles asserted by Genichi Taguchi were actually being followed. Deviations from Genichi Taguchi's principles were taken as issues confronting internal deployment, and ways of responding to these issues were studied. As a result,two issues became apparent and four root causes and responses were clarified.
Remote monitoring systems are being increasingly used to improve the availability of gas turbine combined cycle (GTCC) plants. The key to improving plant availability is early detection of problems. Round-the-clock monitoring enables quick troubleshooting, and remote monitoring systems play an important role in diagnosis of abnormal symptoms. Remote diagnosis technology has advanced and is helping to prevent major malfunctions by detecting small signs of trouble before the trouble becomes serious. By minimizing damage and unplanned halts, this contributes to the improvement of plant availability. One remote diagnostic technique is the MT method, which has proved to be highly effective in diagnosing anomalies in GTCC plants.
Papers on quality engineering were examined by tracing a history of the comments appended to and prizes awarded to papers that appeared in the Journal of Quality Engineering Society from the first issue through volume 16 No.6. This study produced a picture of the history of the development of quality engineering and also showed that our current task is to reexamine the idea of generic functions. That is, besides producing observations on the ways in which papers on quality engineering were evaluated and tracing the history of quality engineering research, this study led to a consideration of future directions for quality engineering research. Specifically, it became clear that generic functions must arise from consideration of how a system actually works. The possibility of finding new ways of comprehending technology through use of submitted papers will be explored as a future research topic.
A study was made of education and the ideal engineer in relation to quality engineering. Education is essentially a stimulus process, in which it is important to maintain a balance with the transmission of knowledge. The importance of the stimulus process was elucidated by observing students, responses in quality engineering education at universities. Through a series of discussions, our research group members have come to an understanding that quality engineering rests on the balance between methodologies and perception (philosophy) of technology; thus it is wrong to attach too much importance to either of them, A study of quality engineering research results based on this understanding revealed that such research results are born not from organizational activities but from the abilities or understanding of individual members of the organizations. This study also revealed that about one in every ten students actually engages in research and development activities after receiving a university education, which agrees with previous research results.
Selection of characteristic values with good additivity is considered important for ensuring reproducibility in parameter design. Functional evaluation by the S/N ratio is recognized as an effective selection means. For tolerance design,however, in which factor levels may have to be set within a narrow range, interaction effects have rarely been discussed. In tolerance design in fields with strong intrinsic interactions, such as optical design, reproducible effects have not been obtained and analysis by use of orthogonal arrays has not been possible in practice. To solve this problem, a new direct productt tolerance design method was developed. When used in actual optical design, it avoided interaction effects and gave results with good reproducibility. This showed that using the S/N ratio as a characteristic value is an effective way to ensure reproducibility in tolerance design as well as in parameter design.
Many acute and chronic hepatic diseases are hard to diagnose, and some are also hard to cure. One of the reasons is that blood tests have become diversified and complex. There have also been cases that could not be diagnosed even after a histological examination of hepatic tissue. In this study we attempted to diagnose acute and chronic hepatic diseases using Mahalanobis-Taguchi adjoint method in Mahalanobis-Taguchi system. Useful results were obtained as reported.