On October 29, 2024, FS Micro Corporation※1 announced that a research paper by President and CEO Atsushi Sakurai has been accepted at RAMS※2, an international conference organized by the IEEE※3 Reliability Society.
This marks the sixth consecutive year that a paper by Atsushi Sakurai has been accepted at RAMS. The paper is scheduled for presentation at RAMS 2025, to be held on January 28, 2025, in Florida, USA.
The theme of this paper is the PMHF※4 formula featured in ISO 26262※5. In ISO 26262, the PMHF is a critical safety metric for automotive systems; however, the derivation process is not adequately clarified in the standard. Atsushi Sakurai has been addressing this issue since 2011 and proposed a more accurate formula for the PMHF at RAMS 2020.
This paper provides an in-depth analysis of the behaviors of two probabilistic processes, the PUA※6 and PUD※7, which define the PMHF under periodic inspection strategies, and derives rigorous formulas for these processes. It also compares these rigorous formulas with previously proposed approximations, demonstrating the practical effectiveness of the approximation method in the PMHF calculations.
Notes
※1: FS Micro Corporation (Headquarters: Nagoya, Japan; President and CEO: Atsushi Sakurai) is a consulting firm specializing in functional safety (a methodology for ensuring that equipment function correctly by implementing various safety measures) for automotive systems.
※2: RAMS (the Reliability and Maintainability Symposium) is an international conference on reliability engineering held annually by the IEEE Reliability Society. The 71st conference will take place in 2025. For more information: https://rams.org/
※3: IEEE is the abbreviation for the Institute of Electrical and Electronics Engineers, the world's largest professional technical organization dedicated to advancing technology. For more information: https://ieee.org/
※4: PMHF stands for Probabilistic Metric for Random Hardware Failures, a key metric under ISO 26262. It represents the time-averaged probability of hazardous system failures over a vehicle’s lifetime.
※5: ISO 26262 is an international standard for functional safety of automotive electronic and electrical systems, aiming to reduce the risk of hazardous events occurring while driving to an acceptable level due to system failures.
※6: PUA, or Point Unavailability, indicates the probability of the system being in a failure state at a given point in time.
※7: PUD, or Point Unavailability Density, represents the probability density of unavailability over time.
Contact Information
Company Name: FS Micro Corporation
Representative: Atsushi Sakurai
Date of Establishment: August 21, 2013
Capital: 32 million yen
Business Description: Consulting services and seminars on functional safety for automotive electronic devices in compliance with ISO 26262
Head Office Address: 4-1-57 Osu, Naka-ku, Nagoya, Aichi 460-0011, Japan
Phone: +81-52-263-3099
Email: info@fs-micro.com
URL: https://fs-micro.com/
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