| Project/Area Number |
13680515
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
社会システム工学
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| Research Institution | University of Electro-Communications |
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Principal Investigator |
SUZUKI Kazuyuki The University of Electro-Communications, Faculty of Electro-Communications, Professor, 電気通信学部, 教授 (00130071)
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| Co-Investigator(Kenkyū-buntansha) |
WANG Lianhua University of Electro-Communications, Faculty of Electro-Communications, Research Associate, 大学院・情報システム学研究科, 教務職員 (40334586)
YAMAMOTO Wataru University of Electro-Communications, School of Electro-Communications, Associate Professor, 電気通信学部, 講師 (30303027)
TANAKA Kenji University of Electro-Communications, Graduate School of Information Systems, Associate Professor, 大学院・情報システム学研究科, 助教授 (60197415)
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| Project Period (FY) |
2001 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2003: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2002: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2001: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Reliability / Data Base / Safety / Human error / Condition Monitoring Maintenance / Data Mining / Warranty Data / Lifetime Data |
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| Research Abstract |
Results are summarized into the following four categories :
1.System for Sharing Information to Prevent Reliability and Safety Problems
To prevent problems in reliability and safety, collection and analysis of data, integration of information through databases, and their application on the actual spot play important roles. Researches on management aspect, human aspect and hardware aspect are implemented and systems for sharing information for reliability and safety are proposed.
2.Design of Lifetime Evaluation and Its Distributional Form
An optimal design for binary lifetime experiment is developed which attains the highest precision of the estimation from D-optimal criterion. Also its sequential design is investigated. It becomes clear that the distributional form of an electro-migration of LSI follows a log-normal distribution, not Weibull distribution.
3.Condition Monitoring Maintenance Aiming Utilization of Multi-media Information
Condition monitoring maintenance using sensors plays impo
… More
rtant roles for reliability and safety assurance. But a sensor has two failure modes : false alarm and failure to alarm. To decrease these failures, a k-out-of-n alarm decision system prevails. This research investigates the optimality of equal thresholds of all sensors for alarming, validity of self-moving sensors, and the thresholds with gray zone areas.
4.Lifetime Data Analysis Based on Large Scale Databases
Nowadays databases of field reliability data have been spreading all over the world and getting larger and larger. Mainly these data come from repair records during product warranty period in each division. To the contrary, sales amount information comes from the databases of sales department. It is necessary to combine these two different databases for estimating lifetime parameters. It is necessary to combine these two different databases fro estimating lifetime parameters. Also, sometimes, sales amount of each month is missing and just total sales amount of the products are known. This research tackles with those problems and develops the methods of lifetime data based on large scale databases. Less
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