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2012 Volume 34 Issue 3 Pages
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Article type: Appendix
2012 Volume 34 Issue 3 Pages
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Article type: Index
2012 Volume 34 Issue 3 Pages
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Article type: Index
2012 Volume 34 Issue 3 Pages
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Masaru SANADA
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2012 Volume 34 Issue 3 Pages
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Seishiro KIBE
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2012 Volume 34 Issue 3 Pages
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Akira KATO
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2012 Volume 34 Issue 3 Pages
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Noriko KANAI
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2012 Volume 34 Issue 3 Pages
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Hiraku KUDO
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2012 Volume 34 Issue 3 Pages
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Minoru KIKUCHI
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2012 Volume 34 Issue 3 Pages
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Yuichi AOKI
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2012 Volume 34 Issue 3 Pages
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Yuichi AOKI
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2012 Volume 34 Issue 3 Pages
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Masaru SANADA
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2012 Volume 34 Issue 3 Pages
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Article type: Appendix
2012 Volume 34 Issue 3 Pages
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Chiharu KUMAZAKI, Kazuyuki SUZUKI, Watalu YAMAMOTO
Article type: Article
2012 Volume 34 Issue 3 Pages
203-213
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Product lifetime is often evaluated by performing accelerated life testing under conditions more stressful than actual usage conditions. The lifetime is estimated using an acceleration model. The use of a valid model enables efficient testing using a limited number of samples and a limited testing time. We used a log-normal acceleration model with two factors (temperature and relative humidity) to derive a test plan for maximizing estimation accuracy under the constraints of a given testing time and a given number of samples. Use of this model revealed that a D-optimal design is determined by the ranges of two levels of both factors and the failure probability, and that there is a trade-off relationship between these two factors. If the failure probability is larger than 0.8, the equal number of sample allocation has almost the same precision as that of the optimal design. Also the effect on accuracy is examined when pre-set estimates of the parameter values used in the life testing design are different from the values of true parameters.
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2012 Volume 34 Issue 3 Pages
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Article type: Cover
2012 Volume 34 Issue 3 Pages
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