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Volume 6 (1998)
- Issue 6 Pages 5-
- Issue 5 Pages 12-
- Issue 4 Pages 10-
- Issue 3 Pages 17-
- Issue 2 Pages 17-
- Issue 1 Pages 11-
Volume 6, Issue 5
Displaying 1-7 of 7 articles from this issue
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16. Prediction by Probability RatioGenichi Taguchi1998Volume 6Issue 5 Pages 12-17
Published: October 01, 1998
Released on J-STAGE: December 24, 2016
JOURNAL FREE ACCESSIn weather forcasting, a prediction using probability ratio has been widely used. After discussing the validity of the methods, how to calculate the Signal-to-Noise ratio as the measure of prediction accuracy is proposed in this article.
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Yoshishige Kanemoto1998Volume 6Issue 5 Pages 33-37
Published: October 01, 1998
Released on J-STAGE: June 10, 2016
JOURNAL FREE ACCESSIn the transmission of information, it is necessary to modulate the input signal. The frequencies of the signals for voice or music are generally low and the waves cannot be effectively transmitted remotely. For a good transmission, signals are modulated to high frequency waves. AM and FM are the modulation methods used for analog wave transmission. In the AM modulation, amplitude is changed whereas in the FM modulation,frequency is changed. Since the latter is more robust against noise, it is widely used for radios, TVs,transceivers or business radios. In the FM system modulation, voltage is used as the signal to change frequency. In this report, parameter design was conducted for the stabilization of an FM modulation circuit. In the traditional parameter design approach for electric circuits, power is used as the signal and is also measured as the output. However, it is inappropriate because the amplitude of both the input and the output are the same. In this report, a new generic function was proposed by considering frequency as the output frequency, and power was treated as noise.View full abstractDownload PDF (991K) -
Isamu Suzuki, Genji Osino1998Volume 6Issue 5 Pages 38-43
Published: October 01, 1998
Released on J-STAGE: June 10, 2016
JOURNAL FREE ACCESSA parameter design was performed on firiction disk for the improvement of the stability over time. The generic function was defined based on the Coulomb's Law the slip torque is proportional to the pushing load. Temperature, humidity and aging conditions were varied as noise factors.View full abstractDownload PDF (1321K) -
Katsura Hino1998Volume 6Issue 5 Pages 44-50
Published: October 01, 1998
Released on J-STAGE: June 10, 2016
JOURNAL FREE ACCESSIn this study, the function and quality characteristics of spot welding was discussed from the quality engineering viewpoint. Characteristics "maximum load of destruction" and "load/displacement relationship within elastic limits" were used for separate analysis and the reproducibility of gains were observed. Also the signal factor ranges were set for the cases with and without including destructive date the observation of reproducibility. The results of analysis showed a better reproducibility in gain by analyzing the load/displacement relationship including destructive data. As to the reproducibility of the gain on sensitivity, better results were obtained when the signal factor levels were set in such a way so that there would be no destructive data. Followings were the results of this study:(1) In spot welding, it is not appropriate to analyze the maximum load of destruction. (2) In the two stage optimization, it is appropriate to utilize the information from the destructive data. It means that at the stage of optimization for functionality, the existence of destructive data makes easier to judge functionality. At the stage of tuning, the destructive data were not used. Instead, the data collected from a narrower signal factor range were analyzed to make it easier to find the factors which affect sensitivity.View full abstractDownload PDF (1393K) -
The Primary Experiment by Static Characteristic S/N Ratio for Promoting QENoriaki Nishiuchi, Kouya Yano, Hideyuki Maruyama1998Volume 6Issue 5 Pages 51-59
Published: October 01, 1998
Released on J-STAGE: June 10, 2016
JOURNAL FREE ACCESSIn the past, the authors have conducted a systematic and large scale experiment on a spray drying granulation. Based on the results, comparison was made between the traditional approach and parameter design including the evaluation of quality characteristic. Followings are the sequence of study : (1) parameter design using non-dynamic characteristics, (2) parameter design using dynamic characteristics, (3) optimization of duality characteristics after parameter design, (4) verification of the results by fluid analysis. In Quality Engineering, the use of dynamic characteristics is a common practice. But in the early stage of introducing Quality Engineering approaches to this company, the experiments using non-dynamic characteristics were purposely conducted to demonstrate the disadvantage of traditional experimentation. Those disadvantage include : (1) limitation in evaluation, (2) poor reproducibility of conclusions, (3) inability of evaluating function, (4) low efficiency of experi mentation. Such trials did help the engineers to shift their paradigms with respect to experimentation, also helped to move to the next step for the appli cation of dynamic characterisrics. In this report, the results from the experiments using non-dynamic characteristics were discussed. Some control factors were screened out and tile whole experiments were overviewed for next expriments to he conducted using dynamic characteristics.View full abstractDownload PDF (2139K) -
Koya Yano, Masataka Shitara, Noriaki Nishiuchi, Hideyuki Maruyama1998Volume 6Issue 5 Pages 60-68
Published: October 01, 1998
Released on J-STAGE: June 10, 2016
JOURNAL FREE ACCESSDynamic Operating Window is an unique and effective approach to improve chemical reaction speed, which is the function of chemical reactions. The concept is simple and easily understood. The main reaction speed is treated as the larger-the-better type SN ratio and the side reaction speed is treated as the smaller-the-better type SN ratio. Another distinctive feature is that there is no necessity to provide noise factors for the study because the main reaction and side reactions behave as noise factors. In this study, dynamic operating window was applied to the granulation process of herbal medicines. Both the movement of fine particles in a granulation process and the generic function of a chemical reaction follow the exponential form. Therefore, the dynamic operating window approach was applied to the granulations process. In the granulation process, powder is fed into a chamber while the heated air is blown upward and the binder solution is sprayed from the top. The particle size increases as particles come in contact. Similar to chemical reactions, the oversize and the undersize are considered as over-reaction and under-reaction respectively. The reducing speed of under-reacted portion (β1) is treated as larger-the-better characteristic and the increasing speed of over-reacted portion (β2) is treated as smaler-the-better characteristic and their SN ratios are denoted by η1 and η2 respectively. Time is treated as the signal factor. The total of the two SN ratios is called the dynamic operating window. After the optimization, the yield was improved by 20 db compared to the initial condition.View full abstractDownload PDF (2083K) -
Yoshikazu Mori, Kenji Ishikawa, Takeo Nakajima, Kouya Yano, Syoji Mats ...1998Volume 6Issue 5 Pages 69-76
Published: October 01, 1998
Released on J-STAGE: June 10, 2016
JOURNAL FREE ACCESSThis study reports the optimization of a synthetic resin reaction. The synthesis reaction of resins is normally called the polymerization reaction. The authors have applied Quality Engineering methods to the synthesis reaction of organic substances using Dynamic Operating Window approach and successfully doubled the reaction speed. As a result, however, there was a problem regarding the reproducibility of conclusions due to the occurrence of mountain shapes and valley shapes in the response graphs. In order to solve this problem,a new approach was tried by analyzing the ratio of the main reaction speed (β1) and the side reaction speed (β2). From the analysis, good reproducibility was obtained. This polymerization study was conducted based on the experience of the previous organic synthesis reaction using a new way of evaluating the molecular weight distribution and the new SN ratio.View full abstractDownload PDF (1656K)
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