Journal of Quality Engineering Society
Online ISSN : 2189-9320
Print ISSN : 2189-633X
ISSN-L : 2189-633X
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Volume 6, Issue 3
Displaying 1-7 of 7 articles from this issue
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  • Mathematics for Quality Engineering 
    14. Signal to Noise Ratio for Digital System
    Genichi Taguchi
    1998Volume 6Issue 3 Pages 17-22
    Published: June 01, 1998
    Released on J-STAGE: December 24, 2016
    DOIhttps://doi.org/10.18890/qes.6.3_17
    JOURNAL FREE ACCESS
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    There are many cases where we have to deal with categorical data as we have no available technology to get continuous measurements. How to define and calculate total output from categorical data is discussed here. After defining total output, how to decompose the total output into two parts, magnitude of signal and magnitude of noises are discussed in order to calculate S/N ratio. This is the article to calculate S/N ratio for the case we have to use categorical data.

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  • Reduction　of　ldle　Shake　of　Truck　Cab　by　Taguchi　Method
    Hiroaki Hoshino, Yoshito Watanabe, Hiroshi lsayama
    1998Volume 6Issue 3 Pages 46-56
    Published: June 01, 1998
    Released on J-STAGE: June 10, 2016
    DOIhttps://doi.org/10.18890/qes.6.3_46
    JOURNAL FREE ACCESS
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    The　cab　vibration　of　large　and　midsize　trucks　during　idle　is　a　major　contributor　of　discomfort. It　is　not　easy　to　reduce　vibration　and　typical　countermeasures　are　costly.　Those　counter measures　taken　are　mostly　suspension　design　change　related. In　the　past,　the　component　parts　that　may　affect　vibration　were　experimented　using　the　trial and　error　approach.　However,　changing　the　component　parts　in　large　or　midsize　trucks　is　time consuming.　Even　studies　using　orthogonal　arrays　are　not　efficient,　either. In　this　paper,　simulation　was　used　with　Quality　Engineering　approaches.　When　simulation　is used,　there　is　no　error　either　due　to　experimental　execution　or　measurements.　Also　these errors　along　with　environmental　conditions　during　truck　operation　can　be　easily　simulated. The　results　of　this　study　showed　the　possibility　of　applying　Quality　Engineering　approaches using　simulation　for　the　reduction　of　vibration.　A　significant　vibration　reduction　was accomplished.
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  • New　Method　To　Evaluate　For　Electrocircuits
    Yoshishige Kanemoto, Naoki Kawada, Hiroshi Yano
    1998Volume 6Issue 3 Pages 57-61
    Published: June 01, 1998
    Released on J-STAGE: June 10, 2016
    DOIhttps://doi.org/10.18890/qes.6.3_57
    JOURNAL FREE ACCESS
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    In　this　report,　a　new　method　of　evaluating　the　performance　of　four-terminal　circuits　is proposed.　In　circuit　design,　sinusoidal　waves　are　frequently　used　as　the　input　signal　to generate　response.　From　the　viewpoint　of　research　efficiency,　responses　are　not　good　outputs to　be　used.　In　Quality　Engineering,　it　is　important　to　establish　a　generic　function.　But　in　many cases,　it　is　difficult　to　find　an　appropriate　generic　function. In　this　report,　the　pulses　that include　wave　disorder　are　used　as　the　input　instead　of　sinusoidal　waves,　and　one　SN　ratio　was used　to　evaluate　the　robustness　of　four-terminal　circuits.　The　results　showed　good　reproducibility　of　the　experimental　conclusions.
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  • Mahalanobis　Distance Application for　Health　Examinations and Treatment　of　Missing　Data
    Part　Ⅲ　:　Case　with　Missing　Data　Treatment
    Yoshiko Hasegawa
    1998Volume 6Issue 3 Pages 62-75
    Published: June 01, 1998
    Released on J-STAGE: June 10, 2016
    DOIhttps://doi.org/10.18890/qes.6.3_62
    JOURNAL FREE ACCESS
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    Dr.　Genichi　Taguchi　proposed　the　use　of　Mahalanobis　distance　a　method　of　treating　multidimensional　information　System　for　health　examinations1).　The　author　has　been　developing such　applications　in　the　past　several　years　and　has　experienced　in　some　cases,　the　data collected　were　not　complete.　When　there　are　missing　data,　the　Mahalanobis　distance　can　not be　precisely　determined. Some　results　of　my　studies　were　reported　in　the　previous　issues　:　the　case　without　missing data2),　and　the　case　with　missing　data.　In　the　latter　case,　missing　data　were　automatically supplemented　by　zeros　based　on　the　current　software　procedure3). In　this　report　a　different　approach　was　studied.　According　to　the　study,　it　was　concluded　that the　average　of　a　corresponding　test　item　that　is　obtained　the　normal　people　could　be　used　to supplement　the　missing　data.
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  • Development　of　a　Substitute　Medium　for　Molasses　by　parameter　design
    Yoshifumi Masuda
    1998Volume 6Issue 3 Pages 76-81
    Published: June 01, 1998
    Released on J-STAGE: June 10, 2016
    DOIhttps://doi.org/10.18890/qes.6.3_76
    JOURNAL FREE ACCESS
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    Molasses　is　commonly　used　as　a　basal　medium　to　mass-produce　the　yeast　for　bread. However　the　odor　and　waste　from　the　manufacturing　process　cause　environmental　problems as　well　as　less　supply　of　molasses　from　abroad　and　it　is　desirable　to　develop　a　synthetic medium　to　substitute　to　molasses. This　study　reports　the　parameter　design　of　the　development.
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  • Optimization　of　Laser　Hardening　Conditions　for　Steel　Plate
    Junnosuke Mizutani, Toshihiro Mukaiyama, Satoshi Hamamoto
    1998Volume 6Issue 3 Pages 82-90
    Published: June 01, 1998
    Released on J-STAGE: June 10, 2016
    DOIhttps://doi.org/10.18890/qes.6.3_82
    JOURNAL FREE ACCESS
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    Laser　hardening　is　a　heat　treatment　technique　where　in　steel　surface　is　being　hardened　due　to the　self　cooling　effect　which　results　from　the　heat　conduction　of　steel　plate　by　just　irradiating a　laser　beam　to　the　steel　plate.　Laser　hardening　depends　on　the　self-cooling　capacity　of　the material　that　the　processing　surface　often　melts　or　deteriorates　according　to　the　irradiation condition　of　the　laser. Thus,　there　are　still　many　unclear　points　in　the　conditions　of　the　laser　beam　processing. This　report　aims　to　obtain　the　most　suitable　CO2　laser　hardening　condition　by　performing　the parameter　design. The　following　points　are　particularly　discussed　in　this　report　: (1)The　laser　irradiation　condition　where　stable　hardening　processing　facies　could　obtain among　various　steel　materials. (2)The　validity　of　a　iron　oxide　absorbent　and　Plain-multi-beam　lens　for　the　CO2　laser hardening. (3)　The　minimum　thickness　of　the　steel　plate　that　can　be　use　in　laser　hardening. (4)　The　maximum　processing　velocity　corresponding　to　the　laser　power　output.
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  • Optimization of a Multi-dimensional lnformation System Using Mahalanobis Distance
    The Case of a Fire Alarm System
    Takashi Kamoshita, Kazuto Tabata, Harutoshi Okano, Kazuhito Takahashi, ...
    1998Volume 6Issue 3 Pages 91-99
    Published: June 01, 1998
    Released on J-STAGE: June 10, 2016
    DOIhttps://doi.org/10.18890/qes.6.3_91
    JOURNAL FREE ACCESS
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    Today, the method of treating multi-dimensional information is becoming increasingly important. There is a strong demand for an effective methodology to treat such information. In this paper, Mahalanobis distance was applied to develop a fire alarm sensing system as an example. From an indoor space under normal conditions, i.e., no fire, data were collected to construct a Mahalanobis space as a base point. The data under simulated fire and smoke conditions were also collected to calculate the Mahalanobis distances of various conditions for comparison. From the study, it was concluded that an effective fire alarm system can be designed using the Mahalanobis distance which is determined from the data under an abnormal indoor space. experiments which are almost the same to and repeat the previous one. As a result of the experiments, we have verified the reproducibility of test results to make sure that this experiment method is effective to evaluate the factors which programmers need to have.
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