Journal of Quality Engineering Society
Online ISSN : 2189-9320
Print ISSN : 2189-633X
ISSN-L : 2189-633X
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Volume 5, Issue 6
Displaying 1-6 of 6 articles from this issue
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  • Mathematics for Quality Engineering
    11. Application of Schmit's Orthogonalization in Mahalanobis space
    Genichi Taguchi
    1997Volume 5Issue 6 Pages 11-15
    Published: December 01, 1997
    Released on J-STAGE: December 24, 2016
    DOIhttps://doi.org/10.18890/qes.5.6_11
    JOURNAL FREE ACCESS
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    In order to reduce cost by selecting important variables to construct Mahalanobis Distance for pattern recognition it is useful to consider the order of importance of each variable. Suppose k variables X1, X2, …, Xk be the order of importance, how to construct a new orthogonal set of variable x1, x2, …, xk to study the accuracy of the pattern recognition. There is only one method called Schmit's orthogonalization. The method is explained here.

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  • Design of an experiment and analysis on the education to read a scale
    Michiko Tsubaki, Takashi Kamoshita, Kazuhito Takahashi
    1997Volume 5Issue 6 Pages 22-29
    Published: December 01, 1997
    Released on J-STAGE: March 24, 2016
    DOIhttps://doi.org/10.18890/qes.5.6_22
    JOURNAL FREE ACCESS
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    In　an　education　process　either　in　school,　in-company　or　other　areas,　it　is　not　easy　to　evaluate human　learning　effectiveness,　This　paper　presents　the　results　of　an　experimental　study　on educating　people　to　read　the　scale　of　a　measuring　device.　The　device　was　selected　because　it was　easy　to　measure　people's　reactions. Various　educational　effects　such　as　educating　methods,　time-passage　or　psychological aspects,　etc.,　were　studied　in　the　experiment.　There　was　a　significant　range　in　people's　reading error　which　was　one　of　the　largest　sources　of　measuring　variation. The　characteristics　used　to　evaluate　the　educational　effects　were　:　(1)　the　final　scale　reading,and (2) the　square-root　of"work"done　before　reading　the　scale. The　former　represents　the　reading　observed　(consciously)　by　the　people,　and　the　latter　is　the calculated　results　indicating　the　sub-conscious　feeling　of　the　people　while　adjusting　the measuring　device.　ln　this　study,　this　represent　the　measurement　stability.
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  • A Study on the Measurement of the Generic Function of Articulated Robots
    Takatoshi Imai, Naoki Kawada, Masayoshi Koike, Akira Sugiyama, Hiroshi ...
    1997Volume 5Issue 6 Pages 30-37
    Published: December 01, 1997
    Released on J-STAGE: March 24, 2016
    DOIhttps://doi.org/10.18890/qes.5.6_30
    JOURNAL FREE ACCESS
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    In　the　evaluation　of　the　generic　function　of　robots,　Dr.　Genichi　Taguchi　has　suggested　to　use the　angular　displacement　of　robot　arms　as　the　signal　for　the　S/N　ratio　calculations. In　this　paper,　two　joints　in　a　multi-joint　robot　were　used　for　the　evaluation　of　robot　function. For　data　collection,　an　appropriate　wall　was　devised　to　construct　a　plane　to　project　the readings　so　that　three-dimensional　readings　could　be　decomposed　into　two-dimensional　data. From　the　results　of　this　experiment,　a　reproducible　evaluating　method　was　obtained　from　the observation　of　the　gains　in　the　S/N　ratio.
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  • The Study on Evaluation of Capability and Errors　in　Programming
    Kei Takada, Muneo Takahashi, Narushi Yamanouchi, Hiroshi Yano
    1997Volume 5Issue 6 Pages 38-44
    Published: December 01, 1997
    Released on J-STAGE: June 10, 2016
    DOIhttps://doi.org/10.18890/qes.5.6_38
    JOURNAL FREE ACCESS
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    Previous　studies　resulted　in　establishing　a　confidence　in　applying　the　Standard　Signal-toNoise　Ratio　in　the　area　of　software　debugging.　ln　a　software　developing　processes,　software coding　takes　place　before　debugging.　In　this　study,　robust　design　is　applied　in　software　coding process.　Signal-to-Noise　Ratio　was　used　to　evaluate　and　optimize　the　software　coding capability.　Factors　were　taken　from　the　area　of　human　design　capability　and　different　types　of mistakes.　This　study　had　lead　us　to　confirm　the　feasibility　to　apply　robust　design　approach　in software　coding,　in　spite　of　some　significant　interactions　among　factors.
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  • Mahalanobis Distance Application for Health Examination and Treatment of Missing Data
    Part II : A　study　on　the　case　with　no　treatment and substituted zeros for missing data
    Yoshiko Hasegawa
    1997Volume 5Issue 6 Pages 45-52
    Published: December 01, 1997
    Released on J-STAGE: March 24, 2016
    DOIhttps://doi.org/10.18890/qes.5.6_45
    JOURNAL FREE ACCESS
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    In the previous paper, the approach of periodical health exanimation using Mahalanobis Distance without missing data was introduced, When there is missing data, the Mahalanobis Space cannot be accurately constructed and the Mahalanobis Distance calculated may lead a wrong conclusion. In this paper, data on sex, age and 25 blood biological tests were used to construct a Mahalanobis Space, Missing data were systematically introduced as the real data were replaced by zeros. The differences in diagnosis results were observed. The results showed that even　a　small　fracton　of　missing　data　will　significantly　change　the　judgment. ln the next paper, some countermeasures for missing data will be proposed and the results reported.
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  • Improving of　Culture Medium　for　BRN　(enzyme) Producing Fungi　Selection
    Takao Goto
    1997Volume 5Issue 6 Pages 53-59
    Published: December 01, 1997
    Released on J-STAGE: March 24, 2016
    DOIhttps://doi.org/10.18890/qes.5.6_53
    JOURNAL FREE ACCESS
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    This　paper　reports　an　experiment　of　applying　quality　engineering　methods　for　a　fermentation process.　BRN　is　an　enzyme　produced　from　micro　organism　The　enzyme　is　cultured　in　a　tank in　a　large　scale　manufacturing　process.　To　improve　productivity,　it　is　necessary　to　maximize the　potency　of　BRN　after　the　completion　of　incubation.　For　this　purpose,　it　is　necessary　to select　the　type　of　fungus　which　will　produce　the　most　potent　BRN. The　productivity　of　BRN　from　micro　organism　is　affected　by　the　composition　of　culture medium　;　its　improvement　is　critical.　This　experiment　reports　the　improvement　of　culture medium　through　the　parameter　design　approach.
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