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Volume 5 (1997)
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Volume 5, Issue 5
Displaying 1-6 of 6 articles from this issue
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10. Generalized Measurement for Functionality and DiagnosisGenichi Taguchi1997 Volume 5 Issue 5 Pages 11-16
Published: October 01, 1997
Released on J-STAGE: December 24, 2016
JOURNAL FREE ACCESSAny measurement system needs to define an origin or a reference point and an unit measure,What would be a reasonable origin and unit measure for functional space or multidimensional space.
Quality engineering defines that an ideal function between signal and output should be the origin and the distance should be the inverse of Signal-to-Noise Ratio in a functional space. Quality engineering also define that Mahalanobis distance obtains from a certain unit space is an unit measure and mean vector of the multivariate space is the zero point or the origin. Those two generalized measurement systems are discussed in this article.
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Atsushi Ohara, Hiroshi Honda, Minetaro Aoki, Hiroshi Yano1997 Volume 5 Issue 5 Pages 23-28
Published: October 01, 1997
Released on J-STAGE: March 24, 2016
JOURNAL FREE ACCESSThe selection of quality characteristics far aero-craft material applications has not been well investigated in this country. Typically, existing quality characteristics from foreign countries are used. The objective of this paper is to find a method which can be used to quantify the quality of fine-casting products. ln quality engineering, "transformability" has been used to evaluate the quality of casting products. It is a good practice to observe the shape of products. However, it does not well express the generic function of such products. ln his study, the test pieces used to analyze transformability in the previous study were again used for the analysis from the functionality viewpoint, To do so, load was added to test pieces and the deformation observed. By comparing the results of these two analysis methods, the possibility of simultaneously evaluating transformability and functionality was investigated. Since the test pieces used in this study were prepared for the study of transformability, they were not quite suited for load/deformation type test. However, the study showed positive results towards this direction.View full abstractDownload PDF (1411K) -
Kouya Yano, Noriaki Nishiuchi, Masaaki Koyama, Hironori Kitazaki, Taka ...1997 Volume 5 Issue 5 Pages 29-37
Published: October 01, 1997
Released on J-STAGE: March 24, 2016
JOURNAL FREE ACCESSSpray drying process is used in food, chemical, mechanical and pharmaceutical industries including Kampo (herb) medicines. lt is a one-step process that converts a liquid solution to dry powder with an approprite particle size distribution, in the case of spray drying herb medicines, solid-liquid herb extract is sprayed in mist form into a high temperature chamber. It is basically, a solid-liquid separation process to obtain, solid product while water is separated in liquid form. Today, the biggest problem in spray drying processes is unwanted deposition of solid material on the wall of the chamber. This paper presents a series of quality engineering studies based on different generic functions, converting : (1) An experiment using static characteristic, (2) An experiment using different dynamic signal-to-noise ratios, (3) Analysis of results using the amount of final product collected instead of the amount deposited on the wall, and the analysis of the functionability of equipment.View full abstractDownload PDF (2345K) -
Shoichi Teshima, Tomonori Bando, Dan Jin1997 Volume 5 Issue 5 Pages 38-45
Published: October 01, 1997
Released on J-STAGE: March 24, 2016
JOURNAL FREE ACCESSIn this paper, a new approach for appearance type defect testing using Mahalanobis-Taguchi System is proposed. ln this approach, the images from a group of good or normal products are transformed into wave patterns. From these normal patterns, a type of data called "differential characteristic" and "integral characteristic" are picked up. A Mahalanobis Space is constructed from these data. Next, the image of the product to be inspected is transformed into a wave pattern, the differential and integral characteristics are picked up from the pattern. The data are calculated with the said Mahalanobis Space to obtain a Mahalanobis Distance. This is the distance showing the deviation from the good products. This approach is especially effective for the inspection of disc shaped objects like clutch discs. Our experimental results show that this approach is quite effective.View full abstractDownload PDF (2090K) -
PartⅠ ; The Case with No Missing DataYoshiko Hasegawa1997 Volume 5 Issue 5 Pages 46-54
Published: October 01, 1997
Released on J-STAGE: March 24, 2016
JOURNAL FREE ACCESSThe application of Mahalanobis Distance for medical forecasting and treatment is defined by Dr. Genichi Taguchi as "a method of rationalizing health diagnosis and clinical testing using the data collected from a group of healthy people". In the analysis process, the data collecte.d from a healthy or a normal group of people are processed by constructing a Mahalanobis Space. These data include various items with diferent dimensions, and many of these items are mutually correlated. The quadratic from distance using the inverse matrix of correlation coefficients, called Mahalanobis Distance, is used for data analysis. However, if some items from some people are missing at the data collection stage, the matrix cannot be calculated. To solve this problem, the author has proposed some countermeasures and studied the effectiveness of the processing methods. A set of complete date including 25 blood biological tests and other items were collected. From these data, some missing data were purposely created at a pre-determined fraction in a random fashion. Treating methods for such missing data were reported in this series of studies. The first part of this report explains the analysis of complete data with no missing items.View full abstractDownload PDF (2168K)
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Yoshiko Hasegawa, Michiyo Kojima1997 Volume 5 Issue 5 Pages 55-63
Published: October 01, 1997
Released on J-STAGE: March 24, 2016
JOURNAL FREE ACCESSUrinary continence is closely related to the rehabilitation of brain disease patients, and it is an important matter of concern for clinical nursing. In this article, Mahalanobis Distance was used to predict the continence of brain disease patients four weeks after the surgical operation or stroke. ln order to calculate Mahalanobis Distance, we used such factors as sex, age, type of brain disease, the level of consciousness (i.e., eye opening, verbal response or motor response), and the level of continence one week after the operation or stroke. Continence of patients was better predicted by examining the interaction of the factors through the use of Mahalanobis Distance, rather than examining these factors separately. Moreover Layout L12 Orthogonal Array was used to discard factors for cost-effective calculation.View full abstractDownload PDF (1842K)
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