We address the problem of failure diagnosis in discrete event systems with decentralized information. propose a coordinated architecture consisting local sites communicating coordinator that is responsible for diagnosing failures occurring system. extend notion diagnosability, originally introduced Sampath et al. (1995) centralized systems, to proposed architecture. specify three protocols, i.e. diagnostic information generated at sites, communication rules used by and coordinator's decision...

We introduce a modular architecture for diagnosis in the framework of discrete event systems. The is best suited systems with multiple interacting components. suggest to use local at each component and provide sufficient conditions so that global system behavior can be diagnosed using these diagnoses. Moreover, context presented architecture, we discuss an incremental algorithm check diagnosability Sampath et al. (1995). suggested has advantage being more computationally efficient than one...

Addresses the problem of failure diagnosis in discrete event systems with decentralized information. We propose a coordinated architecture consisting two local sites communicating coordinator that is responsible for diagnosing failures occurring system. extend notion diagnosability, originally introduced Sampath et al. (1995) centralized systems, to proposed architecture. specify three protocols realize analyze diagnostic properties these protocols. The key features are: (i) they achieve,...

The ISO 26262: Functional Safety – Road Vehicles Standard has been the de-facto automotive functional safety standard since it was first released in 2011. With introduction of complex driving automation systems, new standardization efforts to deal with these systems have initiated address emerging gaps such as human/automation roles and responsibilities presence/absence driver/user, impact technological limitations verification validation needs name a few. This paper highlights some...

ASIL decomposition is a method described in the ISO 26262 standard for assignment of ASILs to redundant requirements. Although appears have similar intent hardware fault tolerance concept IEC 61508-2, not intended reduce assignments elements random failures, but instead focuses on functions and requirements context systematic failures. Based our participation development standard, has been applied different ways practice, all which are fully consistent with standard. Two potential reasons...

We address the following sensor selection problem for failure diagnosis. assume that a dynamic system is diagnosable when set /spl Gamma/ of sensors used. There cost c/sub A/ associated with each A subset Gamma/. Given any Gamma/, it possible to determine, via test (using prespecified diagnostic scheme), whether resulting system-sensor combination diagnosable. Each "diagnosability test" incurs fixed cost. For there an priori probability p/sub determine conditions on costs and probabilities...

Functional safety is of the utmost importance in development safety-critical automotive systems, especially with introduction driver assist and automated driving systems. ISO 26262: Safety – Road Vehicles, has been de facto standard for functional electronics domain since release its first edition 2011. It currently available second edition, published December 2018.
 In this paper, we present an overview standard, which applies to all activities during lifecycle system development....

We introduce a modular architecture for diagnosis in the framework of discrete event systems. The is best suited systems with multiple interacting components. suggest to use local at each component and provide conditions on system structure so that global behavior can be diagnosed using these diagnoses. also discuss test check diagnosability given set up.

A simple methodology to evaluate a variety of architecture designs for safety-critical systems is presented. The approach involves including all the appropriate components in representative fault tree. Evaluating tree results cutsets, system availability, and reliability. Next, Monte Carlo simulation that includes parameters such as mean time repair distributions applied included affect total downtime impact usability. Design experiments (DOE) used track associated levels. inputs can be...

We address the concept of "shared redundancy" where one subsystem may compensate for failure another in design fault tolerant architectures mission critical systems. explore four different alternatives with varying levels physical redundancy components involved. The analysis shows that system safety is defined/limited by "weakest link" among units, is, minimum level all need to work collaboratively will define availability.

<div class="section abstract"><div class="htmlview paragraph">Machine Learning (ML) based technologies are increasingly being used to fulfill safety-critical functions in autonomous and advanced driver assistance systems (ADAS). This change has been spurred by recent developments ML Artificial Intelligence techniques as well rapid growth of computing power. However, demonstrating that ML-based achieve the necessary level safety integrity remains a challenge. Current research...

We investigate and analyze the concept of missed detection its application to design architectures that integrate multiple safety/mission critical functions. The analysis is based on considering different alternatives with varying levels fault components constituting functions or subsystems. overall system reliability availability in a tolerant architecture relies as heavily ability detect it does being able prevent one would attempt by having redundancy and/or improved such an architecture....