Novelty detection is the identification of abnormal system behaviour, in which a model of normality is constructed, with deviations from the model identified as “abnormal”. Complex high-integrity systems typically operate normally for the majority of their service lives, and so examples of abnormal data may be rare in comparison to the amount of available normal data. Given the complexity of su...

Traditionally the statistical or more specifically probabilistic methods form the basic framework for assessing the reliability characteristics of the components. However the recent trend for predicting the reliability or life of the component involves application of physics-offailure methods. This rather new approach is finding wider application as it is based on basic fundamentals of science ...

We describe configuration space visualization methods for mechanical design. Configuration spaces are geometric representations of mechanical function that encode quantitative information, such as part motions, and qualitative information, such as system failure modes. Visualization tools help designers elucidate the qualitative information, which appears as geometric properties of the configur...

We analyse a dataset from the Offshore Reliability Data (OREDA) Database, looking for a model, which can be used to unveil aspects of the quality of the maintenance performed. To do so we must investigate the mathematical modelling of maintenance and repair of components that can fail due to a variety of failure mechanisms. NOTE! UNTIL WE GET A “GO” FROM THE OREDA PROJECT THE DATA IN Table 1 SH...

This document identifies a set of failure cases that may be encountered by IPv6-enabled mobile customers in roaming scenarios. The analysis reveals that the failure causes include improper configurations, incomplete functionality support in equipment, and inconsistent IPv6 deployment strategies between the home and the visited networks. Status of This Memo This document is not an Internet Stand...

The ability to reason about and predict the outcome of contacts is paramount to the successful execution of many robot tasks. Analytical rigid-body contact models are used extensively in planning and control due to their computational efficiency and simplicity, yet despite their prevalence, little if any empirical comparison of these models has been made and it is unclear how well they approxim...

A self-diagnosis design for wireless sensor node is a big challenge for designers. Particularly, when sensor nodes are deployed in harsh environment, it’s very difficult for human to intervene in case of hardware failure of node components. In this paper, we present our novel self-diagnosis for the discrete event systems (DES) like sensor node, which includes a complete strategy of self-diagnos...

The higher the reliability requirements on a product are, the more extensive the test must be to ensure the required reliability. One is often unable to obtain a reasonable amount of test items, when stresses approximate normal operating conditions. To reduce sample-sizes and test duration components are exposed to much higher stresses during the test than within their normal use conditions. Th...

The physics of failure (POF) is an approach to designing reliable products to avoid failure, based on the knowledge of root cause failure mechanisms. It is based on failure reliability technology that studies the failure regularities from the failure reasons and failure mechanisms of the products. A clear understanding of the physics-of-failure is necessary in applications that afford little op...

In a system subject to both repairable and catastrophic (i.e., nonrepairable) failures, ‘mission success’ can be defined as operating for a specified time without a catastrophic failure. We examine the effect of a burn-in process of duration t on the mission time x, and also on the probability of mission success, by introducing several functions and surfaces on the ðt; xÞ-plane whose extrema re...