the study of interactions of jet into cross flow at different longitudinal and transverse angles ofjet was studied. the following components were designed and constructed: a low velocity windtunnel to produce the uniform flow, a flat plate with a traverse injection system to simulate the jetinjection, and a spatial rake to measure the total pressure. the tests were carried out atlongitudinal (α...

Revealing anomalies to support error detection in complex systems is a promising approach when traditional detection mechanisms (i.e., based on event logs, probes and heartbeats) are considered inadequate or not applicable: anomalies in data usually suggest significant, and also critical, actionable information in a wide variety of application domains. The detection capability of such complex s...

This paper presents some experiences in adapting the concepts, framework and methodology for protocol testing from the standard IS-9646 to validate space application protocols. In order to assess the space applications the conformance tests defined in IS-9646 are combined with the fault injection technique. This solution comprises a test architecture and a test process with elements to assess n...

Fault injection (FI) has been shown to be an effective approach to assessing the dependability of software systems. To determine the impact of faults injected during FI, a given oracle is needed. This oracle can take a variety of forms, however prominent oracles include (i) specifications, (ii) error detection mechanisms and (iii) golden runs. Focusing on golden runs, in this paper we show that...

During testing, it is nearly impossible to run all statments or branches of a program. It is especially difficult to test the code used to respond to exceptional conditions. This untested code, often the error recovery code, will tend to be an error prone part of a system. We show that test coverage can be increased through an “assertion violation” technique for injecting software faults during...

In our day to day, we often experience a sense of being tired due to mental or physical workload. Along with that, there is also a feeling of degrading performance, even after the completion of simple tasks. These mental states however, are often not felt consciously or are ignored. This is an attitude that may result in human error, failure, and may lead to potential health problems together w...

Hardware errors are no longer the exceptions in modern cloud data centers. Although virtualization provides software failure isolation across different virtual machines (VM), the virtualization infrastructure including the hypervisor and privileged VMs remains vulnerable to hardware errors. Making matters worse is that such errors are unlikely bounded by virtualization boundary and may lead to ...

Aggressive technology scaling has necessitated the development of techniques to ensure resilience to device faults, including soft errors, circuit wear-out, variability, and environmental effects. All error resilience techniques employ some form of redundancy, resulting in added cost such as area or power overhead. Existing selective hardening techniques have been focused on identifying on the ...

This paper presents a path-based fault-injection approach to increase the eeciency of computer system dependability evaluation. Our approach utilizes knowledge about the execution path to ensure that injected faults are activated. The control ow associated with each path is analyzed to determine the faults that would be activated by that path. By selecting a set of paths that covers a signiican...