Blog

Fail Safe Regulators
The humble airset filter regulator does not get a lot of love.  Relegated to a lonely corner of the control
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Functional Safety for Autonomous Vehicles (Part 3)
Today’s post finally wraps up SIS Engineer’s initial foray into the strange and exotic world of automotive functional safety.  In
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control room
Human Error and Systematic Failures
Today I want to highlight an excellent paper “Improving Barrier Effectiveness Using Human Factors Methods” recently published by Mr. Dave
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Bayesian Coin Flipping
The following is a quick example illustrating how the Bayesian updating process can be used to update prior knowledge based
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Functional Safety for Autonomous Vehicles (Part 2)
In part 1 of this article we introduced the autonomous vehicle functional safety standard, ISO 26262.  We discussed its similarities
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Functional Safety for Autonomous Vehicles (Part1)
When they are not spontaneously combusting or crashing into parked cars (again, again, and again) autonomous vehicles are the coolest thing
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Uncertainty in SIL Calculations
Some time ago, I ran across a complex Safety Instrumented Function (SIF) that had a proof test interval (PTI) of
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Getting Started in SIS Cybersecurity (Part 2)
In part 1 of this article, we covered the various standards and guidelines that are available to inform the design
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Mission Time Graph
Useful Life, Mission Time, and Proof Tests
I have seen several questions recently in online forums where engineers were unclear about the differences and relationships among useful
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Hierarchical Bayesian Prior Use
I presented my paper “A Hierarchical Bayesian Approach to IEC 61511 Prior Use”  at the 14th Global Congress on Process
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Global Congress on Process Safety – Highlights
The 14th Global Congress on Process Safety (GCPS) was held on April 22-26, 2018 in Orlando, FL.  The venue was
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